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https://pdfslide.us/documents/contours-worksheet.html
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math
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CONTOURS WORKSHEETCROSS SECTIONS A cross section shows you the side view or profile view of a landform. This is unlike a map which shows you the view from above. Cross sections are useful as they allow you to know the shapes of hills, mountains, valleys and other features of the landscape.
How to draw a cross section A. To draw a cross section you need a vertical scale. In the diagram the vertical scale is centimeter to 100 metres. This is represented by a series of parallel horizontal lines drawn at centimeter apart. Then number the lines corresponding to the contour lines given on the map. B. Place a neatly folded paper along the line given, in this case AB. The height of each contour line should be written below each mark. C. Place the strip of paper with all the markings along the base of the horizontal line representing the vertical scale. D. Draw a vertical line from each of the marks until it touches the correct height on the vertical scale. E. Finally, join all the top points of the vertical lines with a smooth curve. F. Remember to erase all the unnecessary lines, shade the cross section and brighten the curve. (use a black ink pen or sharp point felt tip marker to brighten the curve) Got that ??? Goooood!!!. Now do one of your own.
Use a scale of cm to 50 meters.
Note: Each Member of the group is to draw his/her own cross-section from the above diagram in your notebook. What is the name of the type of landform that is shown?
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https://www.findfilo.com/math-question-answers/the-value-of-sum-r-0-n-1-n-c-r-n-c-r-n-c-r-1-equalgpe
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math
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JEE Main Questions
Permutations and Combinations
The value of r=0∑n−1nCr/(nCr+nCr+1) equals a. n+1 b. n/2 c. n+2 d. none of these
The number of possible outcomes in a throw of n ordinary dice in which at least one of the die shows and odd number is a. 6n−1 b. 3n−1 c. 6n−3n d. none of these
Find the number of ways in which 5Aprimesand6B′s can be arranged in a row which reads the same backwards and forwards.
The English alphabet has 5 vowels and 21 consonants. How many words with two different vowels and 2 different consonants can be formed from the alphabet?
A number of 18 guests have to be seated, half on each side of a long table. Four particular guests desire to sit on one particular side and three others on the other side. Determine the number of ways in which the sitting arrangements can be made.
How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?
Number of ways in which 30 identical things are distributed among six persons is a.C(17,5) if each gets odd number of things b.C(16,11) if each gets odd number of things c) C(14,5) if each gets even number of things (excluding 0) d. C(15,10)if each gets even number of things (excluding 0)
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http://www.solutioninn.com/an-outofcontrol-truck-with-a-mass-of-5000-kg-is
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math
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Question: An out of control truck with a mass of 5000 kg is
An out-of-control truck with a mass of 5000 kg is traveling at (about 80 mi/h) when it starts descending a steep (15o) incline. The incline is icy, so the coefficient of friction is only 0.30. Use the work– energy theorem to determine how far the truck will skid (assuming it locks its brakes and skids the whole way) before it comes to rest.
Answer to relevant QuestionsIf the work required to speed up a car from 10 km/h to 20 km/h is 5.0 x 103 J, what would be the work required to increase the car’s speed from 20 km/h to 30 km/h? The floor of the basement of a house is 3.0 m below ground level, and the floor of the attic is 4.5 m above ground level. (a) If an object in the attic were brought to the basement, the change in potential energy will be ...Referring to Fig. 3.13, find the speed with which the stone strikes the water using energy considerations. A simple pendulum has a length of 0.75 m and a bob with a mass of 0.15 kg. The bob is released from an angle of relative to a vertical reference line (Fig. 5.34). (a) Show that the vertical height of the bob when it is ...A 1.00-kg block (M) is on a frictionless, 20o inclined plane. The block is attached to a spring (k = 25 N/m) that is fixed to a wall at the bottom of the incline. Alight string attached to the block runs over a frictionless ...
Post your question
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https://www.coursehero.com/file/6759259/god3/
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math
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This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Information Theory and Coding-HW 3 V Balakrishnan Department of ECE Johns Hopkins University October 1, 2006 1 Fano’s inequality Let us first maximize H(p) subject to p 1 = P e and m X i =2 p i = 1- P e So we would have the unconstrained Lagrange’s equation as- (1- P e ) log(1- P e )- m X i =2 p i log( p i )- λ ( m X i =2 p i- P e ) Differentiating wrt p i for i > 1,we get that p i = K where K is a constant, which means that p i = P e m- 1 So we have- (1- P e ) log(1- P e )- m X i =2 p i log( p i ) ≤ - (1- P e ) log(1- P e )- P e log P e m- 1 which gives H ( P e ) + P e log( m- 1) ≥ H ( p ) which can be diluted to P e ≥ H ( p )- 1 log( m- 1) where H ( p ) =- m X i =1 p i log( p i ) 1 2 Logical order of ideas 2.1 Part a Clearly the conditional version of the mutual information is derived from the conditional ver- sion of entropy. Though the chain rule for relative entropy is derived independently,it is not as widely used(or has practical implications) as the mutual information or entropy. So the order would be 1 chain rule for H ( X 1 , X 2 . . . X n ) 2 chain rule for I ( X 1 , X 2 . . . X n ; Y ) 3 chain rule for D ( p ( x 1 . . . x n ) || q ( x 1 . . . x n )) 2.2 Part b Clearly Jenson’s inequality is the strongest,then we have relative entropy following mutual in- formation. This is because,we derive the fact that I ( X ; Y ) ≥ 0 by rewriting it as D ( p ( x, y ) || p ( x ) p ( y )). So the order is 1 Jenson’s inequality 2 D ( f || g ) ≥ 3 I ( X ; Y ) ≥ 3 Entropy of Missorted file Let X be any permutation of the numbers 1 , 2 . . . n we can easily observe the following distri- bution P ( X ) = 1 n 2 Case I..if X(i)=j and X(j)=i and X(k)=k for k 6 = i, k 6 = j, | i- j | > 1 2 n 2 Case II..if X(i)=j and X(j)=i and X(k)=k for k 6 = i, k 6 = j, | i- j | = 1 1 n Case III..if X(k)=k for all k Imagine we have n numbers placed in a row and there are n+1 dots surrounding it. simply speaking ( dot )1( dot )2( dot )3 . . . ( dot ) n ( dot ) If we pick a number,we dont want to place that number is any of the adjacent 2 dots(to not...
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This note was uploaded on 02/05/2012 for the course EE EE308 taught by Professor B.k.dey during the Spring '09 term at IIT Bombay.
- Spring '09
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http://verbs.colorado.edu/propbank/framesets-english-aliases/bog.html
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math
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Roleset id: bog_down.01 , to get stuck, Source: , vncls: , framnet: bog_down.01: BOG_DOWN-V NOTES: Frames file for 'bog' based on survey of sentences in the WSJ corpus. Frames created by Olga (from bog.01-v)
Arg0-PAG: agent, causer
Arg1-PPT: entity bogged down
person: ns, tense: present, aspect: ns, voice: active, form: full
Douglas Stoneman , vice president of Shell Canada , noted that producers would prefer [*-2] to avoid hearings into competing proposals that [*T*-1]would lengthen the regulatory review process and bog down development .
Argm-rcl: that -> hearings
Rel: [ bog] [ down]
person: ns, tense: present, aspect: progressive, voice: active, form: participle
[*-2] Taken [*-1]together , the auto-sales and durable-goods reports confirmed perceptions that the economy is bogging down .
Arg1: the economy
Rel: [ bogging] [ down]
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https://link.springer.com/article/10.1007%2Fs10898-014-0197-8
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math
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A convergent conical algorithm with \(\omega \)-bisection for concave minimization
- 168 Downloads
The conical algorithm is a global optimization algorithm proposed by Tuy in 1964 to solve concave minimization problems. Introducing the concept of pseudo-nonsingularity, we give an alternative proof of convergence of the algorithm with the \(\omega \)-subdivision rule. We also develop a new convergent subdivision rule, named \(\omega \)-bisection, and report numerical results of comparing it with the usual \(\omega \)-subdivision.
KeywordsGlobal optimization Concave minimization Conical algorithm Bisection \(\omega \)-subdivision
The authors would like to thank the anonymous referee for his/her valuable comments, which significantly improved the quality of this article.
- 1.Bali, S.: Minimization of a concave function on a bounded convex polyhedron. Ph.D. dissertation, University of California, Los Angeles (1973)Google Scholar
- 2.GNU linear programming kit. http://www.gnu.org/software/glpk/
- 3.GNU octave. http://www.gnu.org/software/octave/
- 12.Tuy, H.: Concave programming under linear constraints. Sov. Math. 5, 1437–1440 (1964)Google Scholar
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https://www.eventbrite.co.uk/e/introduction-to-casio-fx-cg20-and-teach-a-level-statistics-2-tickets-28339978639
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math
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Prepare your maths department for the new AS/A Level with the latest graphic calculator technology. This course is most suited for professionals teaching A-level maths in the UK. Calculators will be provided.
Trainer: Ted Graham (bio)
Introduction to the Casio FX-CG20 graphical calculator
Statistics Level 2 (A level):
- Statistical distributions
- Statistical hypothesis testing
Preparing for the new A-level Maths specification
Click here for full information
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https://learningtowalktogether.wordpress.com/tag/busy/
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math
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If only there were more hours in the day . . . If only there were two of me . . . I'll never get all of this done . . . If only there were a solution . . . But wait. There is! You won't like it though. In fact, I can already … Continue reading A Radical Solution to a Common Problem
I was held accountable when a friend posed this question to me. Had I been following my own advice?
What is the chaos in your life?
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http://multiphase2000.uimech.org/proc/Tsamopoulos.html
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math
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The International Conference on Multiphase Systems, ICMS'2000
|Stability and Dynamics of the Core-Annular Flow in a Periodically Constricted Tube|
Kouris Ch., Tsamopoulos J.
Laboratory of Computational Fluid Dynamics, Department of Chemical Engineering, University of Patras, Patras, GREECE
Both the stability and the time evolution of the concentric two-phase flow of two immiscible fluids in a tube of sinusoidally varying cross section are studied. The model equations depend on six dimensionless parameters: the Reynolds, Weber and Froude numbers and the ratios of density, viscosity and volume of the two fluids. Two more dimensionless numbers describe the shape of the solid wall: the constriction ratio and the ratio of its maximum radius to its period. Our both stability calculations and dynamic simulations are performed by approximating every dependent variable using Chebyshev polynomials in the radial and Fourier modes in the axial direction.
Arnoldi's algorithm is used to compute the unstable eigenvalues of the linearized equations of motion of the two-phase flow in both two- and three- dimensional disturbances. Extensive calculations for the dependence of the neutral stability boundaries on the various parameters are performed. Three-dimensional instabilities do not arise before the two-dimensional ones. In most cases that the steady solution is found to become unstable it does so through a Hopf bifurcation.
The time integration of the non-linear axisymmetric set of equations is performed using the 2nd order Adams-Moulton method. The time evolution of the core-annular flow (CAF), for such values of the dimensionless numbers that the steady solution becomes unstable, reveals that indeed travelling waves bifurcate from the perfect CAF which although grow exponentially at first, saturate as a result of nonlinear mechanisms.
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http://slideplayer.com/slide/1666001/
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math
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4 What Goes In The Box ? Calculate the perimeter of the shapes below: (2)9.7cm11.4cm(1)9 cm4cmP = 26cmP=32.5cm(3)7.8 m10.3m8.1m7.9m(4)12cmP = 34.1mP=72cm
5 The Perimeter Of A Circle. Look at the circle below:Circumference.What do we call the distance around the circle?What do we call the distance across the circle ?DiameterKey Question.How many times bigger is the diameter of the circle compared to the diameter ?The circumference is a bit more than three times the diameter.
6 Estimating The Circumference. If we know that the circumference of a circle is roughly three times the diameter , then estimate the circumference of the circles below:(2)9m(1)6cmCircumference = 3 x diameterC = 3 x6cmCircumference = 3 x diameterC = 3 x9mC = 18 cmC = 27m
7 The Number Called Pi.After a great deal of measuring and calculating , Greek mathematicians came up with a better estimate of how many times bigger the circumference was compared to the diameter.Key Fact.They found that the circumference was 3.14 times bigger than the diameter. They called 3.14 Pi after a letter in the Greek alphabet. The letter pi is written as :The Circumference Of A Circle.Circumference = Pi x Diameter
8 Calculating The Circumference. Calculate the circumference of the circles below:(2)2.8cm(1)10mC = x DC = x D= 3.14D = 10m= 3.14D = 2.8cmC = 3.14 x 10C = 3.14 x 2.8C = 31.4mC = 8.8cm
9 What Goes In The Box 2 ?Calculate the circumference of the circles shown below:(1)4cm(2)26cm12.6cm(3)2.3m81.64m14.4m
10 Perimeter Of More Complex Shapes. Calculate the perimeter of the shapes below:(1)12mP = D + ( D)2P = 12 + (3.14 x12) 2P =P = cm
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https://www.nagwa.com/en/videos/658159271637/
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math
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A 600-milliliter solution contains 10.1 grams of magnesium chloride. What is the molar concentration of magnesium chloride in this solution?
What we have here is 600 milliliters or 0.6 liters of a solution of magnesium
chloride. Magnesium chloride has the formula MgCl₂. That’s one magnesium ion and two chloride ions. Magnesium is in group two and therefore loses two electrons to form Mg²⁺. Chlorine is in group 17 and gains one electron to form Cl⁻. We need two chloride ions to make an overall neutral magnesium chloride ionic
What this question is asking for is the concentration of magnesium chloride in the
solution. A molar concentration has units of moles per liter, otherwise given the letter
𝑀. However, we’ve been given the mass of magnesium chloride, not the number of
moles. So one thing you should definitely not do is work out the mass concentration in grams
So the first thing we need to do to answer this question is to calculate the number
of moles of magnesium chloride in 10.1 grams. Then we can calculate the concentration of magnesium chloride. To work out the number of moles, we can use the formula 𝑛 equals little 𝑚 over big
𝑀, where 𝑛 is equal to the number of moles. Little 𝑚 is equal to the mass of the substance in grams. And big 𝑀 is equal to the molar mass in grams per mole.
To do the first step, we need to know the molar mass of magnesium chloride. This is equal to the atomic mass of magnesium plus two equivalents of the atomic mass
of chlorine. We need two equivalents of the atomic mass of chlorine, because we have two
equivalents of chloride ions per magnesium chloride unit. We can look up the values of these in our periodic table.
The relative atomic mass of magnesium is 24.305. So the molar atomic mass of magnesium is 24.305 grams per mole. The molar mass of chlorine is 35.45 grams per mole. Completing this calculation gives us a molar mass of magnesium chloride of 95.205
grams per mole.
Now we need to do is substitute values into our equation 𝑛 equals 𝑚 over 𝑀. We divide 10.1 grams of magnesium chloride by 95.205 grams per mole, which is equal
to about 0.1 moles of magnesium chloride. Now we need to calculate the concentration of magnesium chloride using the formula 𝐶
equals 𝑛 divided by 𝑉, where 𝐶 is the concentration in molar. 𝑛 is the number of moles. And 𝑉 is the volume in liters.
However, we’ve been given the volume of solution in milliliters. The prefix “m” means 10 to the minus three of something. So 600 milliliters equals 600 times 10 to the minus three liters or 0.6 liters. Another way of looking at this is that 1000 milliliters is equivalent to one
Now we can substitute our values into the formula 𝐶 equals 𝑛 divided by 𝑉. So we divide 0.106087 by 0.6, which is equal to 0.176811 molar. The values in the question are all to three significant figures. So we should round our answer to the same degree of precision. Therefore, the molar concentration of magnesium chloride when 10.1 grams of magnesium
chloride is in 600 milliliters of solution is 0.177 molar.
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https://www.kopykitab.com/blog/csvtu-exam-papers-be-i-year-basic-electrical-engineering-april-may-2009/
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math
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BE (I year)
Examination April-May 2009
Q.1 (a) Why are electrical machine made of magnetic materials?
(b) State and explain super position theorem.
(c) Determine the equivalent resistance between the terminals X and Y of the circuit shown.
(d) A steel ring of 25 cm in diameter and of circular section 3 cm in diameter has an air gap of 1.5 mm length. If is would uniformly with 750 turns of wire carrying a current of 2.1 A.
(i) Magneto motive force.
(ii) Flux density in air gap.
(iii) Magnetic flux.
(iv) Relative permeability of steel ring.
Assume that iron path takes about 35% of the total miff.
Q.2 (a) Show that power consumed in a 1 – Φ.
Ac circuit is-given by VI coos θ.
(b) Derive the expression for the band width in series RLC circuit.
(c) A circuit consist of R = 35 ohms in series with an unknown impedance Z. For a sinusoidal current of 2 A, the observed voltages are 200 volte across R and z together , 150 volts across impendence Z. Find the impedance Z.
(d) Show that: tan Φ = (W2 – W1)
W1 + W2
Unit – III
Q.3 (a) The efficiency of a transformer is high compared to other electrical machines. Give reasons .
(b) Write short note on no load and short circuit tests.
(c) What do you mean by efficiency of a transformer ? Derive the condition for maximum efficiency.
(d) A 200 kava transformer has an efficiency of 98% at full load. If the maximum efficiency occurs at 75% of lull load, calculate the efficiency at half load. Assume negligible magnetizing current and pf at 0.8 atall load.
Q.4 (a) A series motor should never be started with our load on if Give reasons .
(b) A 120 V decent motor has an armature resistance of 02 ohrr and a field resistance of 60 ohms. It runs at 1800 rpm it is taking a full load current of 40A. Find the speed of the moto when it is operating at half full load.
(c) With usual notations, derive the torque equation of a 0.1 motor.
(d) Derive the expression for developed torque in a 3 phase in diction motor.
Q.5 (a) How do you extend the rate of an ammeter?
(b) What is the principle of a moving iron voltmeter?
(c) Explain the operation of a single phase energy meter.
(d) A single phase K who meter makes 500 revolutions per K Who. It is found in testing as making 40 revolutions in 58.1 seconds at 5 kW full load find out the percentage error.
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https://www.physicsforums.com/threads/formulas-for-linear-functions-can-anyone-please-help-me-understand-this-problem.17486/
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math
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I am stuck. I've gone through all my notes to try and figure out how to do this problem, with no success. Any help would be appriciated. Thank you! An insurance salesperson earns an annual salary of $12,000 plus a commission equal to 3% of the premiums on all policies sold. If f(x) is a function which gives her annual earnings, what is the slope of f(x)? What is the y-intercept? Find the equation for f(x). The equation I came up with was: 12000+.03X This is as far as I have gotten.
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https://doubtnut.com/question-answer/when-3-is-added-to-the-denominator-and-2-is-subtracted-from-the-numerator-a-fraction-becomes-1-4-and-1410011
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math
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Ab clear karein apne doubts Whatsapp par bhi. Apna phone number register karein.
Hurray! Now you can find solutions on Whatsapp easily. We will ping you shortly.
When 3 is added to the
denominator and 2 is subtracted from the numerator a fraction becomes 1/4.
And, when 6 is added to numerator and the denominator is multiplied by 3 it
becomes 2/3. Find the fraction.
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https://www.thefreelibrary.com/Nonlinear+speed+controller+supported+by+direct+torque+control...-a0335410318
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math
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Nonlinear speed controller supported by direct torque control algorithm and space vector modulation for induction motors in electrical vehicles.
Direct torque control algorithms for induction motors use reference torque values. Therefore, the transformation of reference speed values into reference torque values is needed. Classical feedback controllers use speed error values for the transformation. In addition, different system parameters are incorporated into the transformation for a better control operation , . As it is well-known, resolution is important for controller calculations and frequency is important at time sharing switching operations , .
In this study, starting from the design of Lyapunov function-based nonlinear controller, mechanical speed value and speed error value are used for the control transformation. To obtain the required torque value, reference speed value is transformed by either classical speed control or nonlinear speed control methods. In this study, PI controller is preferred for the classical speed control and reference controller is obtained by using well-known Ziegler-Nichols tuning rule. Unit step function is used for input reference at design operation . For the nonlinear speed control, Lyapunov function-based nonlinear controller is proposed. The design of the proposed controller is based on an energy function and opposite signed dynamics of this function. Zero is fixity point for the functions , . In addition, a parameter of the controlled system is used in the energy functions and the dynamic functions. Pause point is expected to be almost 1 for the control parameters. The torque controller uses a reference value provided to the controller. A gas pedal is used to set a reference speed value. The speed controller transforms the speed value into the reference torque value. The torque controller calculates required voltage vector for the motor and sends the vector to inverter controller. For the motor system, a power electronic inverter is used to invert direct currents to alternative currents. Time sharing-based vector controller sets the required voltage vector. Angular and amplitude values of the vector are obtained by the inverter control system. For experimental evaluations in this study, a rotational loaded system was used. In the design steps, the variation of electromagnetic torque parameter was taken into consideration. Required reference torque was created by using the reference speed value for direct torque controller (DTC).
II. DIRECT TORQUE CONTROL
Induction machine model is described in the general reference frame by using the following equations:
[[bar.V].sup.g.sub.s] = [R.sub.s] x [[bar.i].sup.g.sub.s] + d[[bar.[psi]].sup.g.sub.s]/dt + j x [[omega].sup.g] x [[bar.[psi]].sup.g.sub.s], (1)
0 = [R.sub.r] x [[bar.i].sup.g.sub.r] + d[[bar.[psi]].sup.g.sub.r]/dt + j([[omega].sub.g] - [[omega].sub.r])[[bar.[psi]].sup.g.sub.r], (2)
[[bar.[psi]].sup.g.sub.s] = [L.sub.s] x [[bar.i].sup.g.sub.s] + [L.sub.m] x [[bar.i].sup.g.sub.r], (3)
[[bar.[psi]].sup.g.sub.r] = [L.sub.r] x [[bar.i].sup.g.sub.r] + [L.sub.m] x [[bar.i].sup.g.sub.s], (4)
where [[bar.V].sub.s] is supply voltage signal of induction motor stator, [[bar.i].sub.s] and [[bar.i].sub.r] are stator and rotor currents, [[omega].sub.g] is general reference speed, [[omega].sub.r] is rotor angular velocity speed, [R.sub.s] and [R.sub.r] are stator and rotor resistances, [[bar.[psi]].sup.g.sub.s] and [[bar.[psi]].sup.g.sub.r] are stator and rotor field linkages. [L.sub.s] represents the parameter of stator leakage inductance, [L.sub.r] represents the parameter of rotor leakage inductance, and [L.sub.m] represents the parameter of mutual inductance. The superscript "g" refers to reference frame , .
Mechanical dynamics of the induction motor is described as follows:
[T.sub.e] = [3/2] x [p/2] x Im([[bar.[psi]].sup.g.sub.s] x [[bar.i].sup.g.sub.s]), (5)
J x [d[[omega].sub.n]/dt] = J x [2/p] x [d[[omega].sub.r]/dt] = [T.sub.e] - [T.sub.load], (6)
where [T.sub.e] is the motor torque, p is the number of motor poles, J is system inertia, [[omega].sub.m] is rotor mechanical angular velocity speed, and Thad is [T.sub.load] torque value . One of the six non-zero and two zero voltage vectors is selected by the torque controller and required switch positions are sent to the inverter , :
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], (7)
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], (8)
where [DELTA][T.sub.e] and [DELTA][[bar.[psi]].sup.g.sub.s] are the symbols of torque and flux errors, respectively. [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] represent the reference values of [T.sub.e] and [[bar.[psi]].sup.g.sub.s], respectively. For selecting voltage vector, the errors must be taken into the hysteresis bands. The [[bar.V].sup.g.sub.s] vectors can be calculated using (9)
[[bar.V].sup.g.sub.s]] = 2/3 x [V.sub.dc] x ([S.sub.a] + [e.sup.jx2.[pi]/e] x [S.sub.b] + [e.sup.jx4.[pi]/3] x [S.sub.c]), (9)
where [S.sub.a], [S.sub.b] and [S.sub.c] represent stator phase A, phase B, and phase C, respectively.
When the vector is selected, stator flux is rotated to desired frequency, which is inside a specified band. If the motor stator ohmic drops are neglected, stator flux dynamic is calculated using (10)
d[[bar.[psi]].sup.g.sub.s] = [[bar.V].sup.g.sub.s] x [DELTA]T. (10)
If (11) below and (5) are used together, a sinusoidal function of [gamma] is obtained on motor torque. [gamma] is the angle value between stator and rotor fields of induction motor. The angle is adapted and required stator field is obtained using (13) and (14), respectively :
[[bar.i].sub.s] = [[bar.[psi]].sup.g.sub.s]/[sigma][L.sub.s] - [[L.sub.m]/[sigma][L.sub.s][L.sub.r]]/[[bar.[psi]].sup.g'.sub.r] and [sigma] = 1 - [L.sup.2.sub.m]/[L.sub.s][L.sub.r], (11)
[T.sub.e] = [3/2][p/2][[L.sub.m]/[sigma] x [L.sub.s] x [L.sub.r]] x [absolute value of [[bar.[psi]].sup.g.sub.s]] x [absolute value of [[bar.[psi]].sup.g'.sub.s]] x sin [gamma], (12)
[[bar.[psi]].sup.s.sub.s] = [integral]([[bar.V].sup.s.sub.s] - [[bar.i].sup.s.sub.s] x [R.sub.s])dt, (13)
[T.sub.e] = 3/2 x p x ([[phi].sup.s.sub.ds] x [i.sup.s.sub.qs] - [[phi].sup.s.sub.qs] x [i.sup.s.sub.ds]), (14)
where the superscript "s" refers to stator reference frame. [[phi].sup.s.sub.ds] is the real axis component of stator magnetic field space vector fixed coordinate system, [[phi].sup.s.sub.qs] is the imaginary axis component of stator magnetic field space vector fixed coordinate system, [i.sub.ds] is the real axis of stator flux in the fixed coordinate system, and [i.sub.qs] is the imaginary axis of stator flux in the fixed coordinate system.
Measured stator voltage and stator current signals are represented with [[bar.V].sup.s.sub.s] and [[bar.i].sup.s.sub.s]. [[bar.[psi]].sup.s.sub.s] represents calculated stator field vector. [DELTA][[bar.[psi]].sup.g.sub.s] and [DELTA][T.sub.e] states are enough for voltage vector selection . The details of the proposed control system and data flow in the proposed control system are shown in Fig. 1.
III. TIME SHARING-BASED SPACE VECTOR MODULATION
The disadvantage of classical direct torque control systems is the use of inverter control modulator. This disadvantage is reinforced with time sharing-based space vector modulator which supplies required voltage vector at angle position. The hysteresis band values and flux vector components are placed into the time sharing-based space vector modulator. Measured voltage and current parameters are used for the calculation of stator flux vector. These parameters are also used for the calculation of electromagnetic torque. Torque error value and flux vector positions on their hysteresis bands are enough for selecting required supply voltage vector , .
The position, stator flux band position and torque error band position are used in three different cases. In the first case, flux angular position [[epsilon].sub.R]: 0[degrees] ... 60[degrees] is placed in the band area and both of the band values are positive. First active vector is selected as V1 and second active vector is selected as [[bar.V].sub.2]. [t.sub.vectornumber] is relevant vector switching time and [t.sub.total]. is total switching period. Then, [[epsilon].sub.R] is determined in 0[degrees] ... 360[degrees] circular area. When these parameters are used, following time parts are obtained:
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]. (15)
In the second case, [[epsilon].sub.R]: 120[degrees] ... 180[degrees] is placed in the band area, the flux band value is positive and torque error band value is equal to zero. This means [t.sub.1] = [t.sub.total] and [t.sub.2] = [t.sub.0] = [t.sub.7] = 0 time values must be chosen in time domain. In the third case, torque error band value and stator flux band value have negative signs and [[epsilon].sub.R]: 0[degrees] ... 60[degrees] angular position. Then, [[bar.V].sub.5] and [[bar.V].sub.6] active vectors are selected and switching time parts are calculated as follows
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], (16)
IV. PERFORMANCE EVALUATIONS
In the proposed system, nonlinear speed controller and time sharing-based space vector modulator are integrated into the induction motor control system. For experimental evaluations in this study, induction motor parameters, [R.sub.1] = 1.027 [OMEGA], [R.sub.2] = 1.475 [OMEGA], [L.sub.0] =112.7 mH, [L.sub.[sigma]1] = [L.sub.[sigma]2] = 8.07 mH and J = 0.089 kg.[m.sup.2]. DC supply voltage is 336 V.
To compare the proposed system with pulse width controlled system, time constant, 20 [micro]s, and carrier frequency, 20 kHz, are used for discrete time applications with pulse width modulator controlled inverter in MATLAB. Sampling time, 50 [micro]s, and [t.sub.total] = 800 [micro]s are used for [down arrow]discrete time application system with time sharing-based space vector modulator controlled inverter in MATLAB. Fig. 2 shows the values of the block parameters of insulated gate bipolar transistor (IGBT) inverter used in this study.
Due to the disadvantage that the PCI card added to the system together with the optoelectronic switches has only one analog to digital converter and one digital to analog converter, stator currents-voltages and encoder signals slide on time phase. Hence, in this system, desired performance characteristics may not be obtained by control algorithms.
Upper valued time parameters are used for pulse width modulator-based system. DC supply voltage is selected as 141 V for both systems. If voltage signals are taken into consideration, the result of the pulse modulator is 110-155 V and the result of the space modulator is 140 [+ or -] 8 V. Desired sinusoidal current signal, [i.sub.continuous] = 2-sin(2[pi] x 50 x t)A, is generated in the stator windings by the space vector modulator controlled inverter. As it is well-known, circular shaped flux is desired for the best performance of induction motors , . Fig. 3 (a) and (b) show the results of stator phase-A voltage signals obtained from the pulse width modulator and the time shared space vector modulator, respectively.
Fig. 4 (a) and (b) show the results of stator phase-A current signals obtained from the pulse width modulator and the time shared space vector modulator, respectively. Fig. 5 (a) and (b) show the results of stator flux positions in D-Q axis obtained from the pulse width modulator and the time shared space vector modulator, respectively. It is seen that desired flux structure is formed by the space vector modulator. The reason of axis slidings is the PCI card used for analog to digital and digital to analog conversions.
In Fig. 6 (a) and (b), the positions of rotor mechanical speeds in time domain obtained from the pulse width modulator and the time shared space vector modulator are shown. After 0.1 sec, pulse width controlled system takes its continuous time position. On the other hand, the proposed space vector controller is slower. It takes its continuous time position after 0.4 sec. But, ~[+ or -] 80rpm fluctuation of the pulse width controlled motor shows that its performance is worse in continuous time.
To compare the proposed system with classical feedback control and Lyapunov function, 10 (is time constant is used for all discrete time simulations in MATLAB. The same system parameters used in the previous experiments are used. As shown in Fig. 7, stator phase-A currents have nearly same characteristics for both the systems. Also, as shown in Fig. 8, stator flux positions in D-Q axis have nearly
As shown in Fig. 9 (a) and (b), the PI controller is 25% faster than the proposed nonlinear controller. However, different from the PI controller, overshoot value of the proposed controller is zero. In Fig. 10 (a) and (b), stator electromagnetic torque positions in time domain obtained from the PI controller and the proposed nonlinear controller are shown.
In this paper, the details of nonlinear speed controller supported by direct torque control algorithm and space vector modulation are explained. With the results of comparative experimental studies, the performance of the proposed system and its advantages over classical controllers are shown.
Proposed nonlinear speed controller has several advantages over classical controllers such as the use of different Lyapunov functions and easy integration of different system parameters.
Manuscript received June 24, 2012; accepted April 19, 2013.
O. Ellabban, J. V. Mierlo, and P. Lataire, "A Comparative Study of Different Control Techniques for an Induction Motor Fed by a Z-Source Inverter for Electric Vehicles", in Proc. of International Conference on Power Engineering, Energy and Electrical Drives, Malaga, Spain, 2011, pp. 1-7.
H. Ouadi, F. Giri, A. Elfadili, L. Dugard, "Induction machine speed control with flux optimization", Control Engineering Practice, vol. 18, pp. 55-66, 2010. [Online]. Available: http://dx.doi.org/10.1016/ j.conengprac.2009.08.006
H. Miranda, P. Cortes, J. I. Yuz, J. Rodriguez, "Predictive Torque Control of Induction Machines Based on State-Space Models", IEEE Transactions on Industrial Electronics, vol. 56, no. 6, pp. 19161924, 2009. [Online]. Available: http://dx.doi.org/10.1109/ TIE.2009.2014904
M. Pucci, "Direct field oriented control of linear induction motors", Electric Power Systems Research, vol. 89, pp. 1-7, 2011.
K. Ogata, Modern Control Engineering. New Jersey: Prentice Hall, 2002, pp. 53-79.
J. E. Slotine, W. Li, Applied Non-Linear Control. New Jersey: Prentice Hall, 1991 pp. 383-453.
H. K. Khalil, Nonlinear Systems. New Jersey: Pearson Education, 2000, pp. 87-181.
N. R. N. Idris, A. H. M. Yatim, "Direct Torque Control of Induction Machines with Constant Switching Frequency and Reduced Torque Ripple", IEEE Transactions on Industrial Electronics, vol. 51, no. 4, pp. 758-767, 2004. [Online]. Available: http://dx.doi.org/ 10.1109/TIE.2004.831718
P. Vas, Sensorless Vector and Direct Torque Control. Oxford: Oxford Science Publications, 1998, pp. 263-352.
H. F. A. Wahab, H. Sanusi, "Simulink Model of Direct Torque Control of Induction Machine", American Journal of Applied Sciences, vol. 5, pp. 1083-1090, 2008. [Online]. Available: http://dx.doi.org/10.3844/ajassp.2008.1083.1090
K. Gulez, A. A. Adam, H. Pastaci, "Passive Filter Topology to Minimize Torque Ripples and Harmonic Noises in IPMSM Derived with HDTC", International Journal of Electronics, vol. 94, no. 1, pp. 23-33, 2007. [Online]. Available: http://dx.doi.org/ 10.1080/00207210601070911
C. M. Ong, Dynamic Simulation of Electric Machinery Using MATLAB/Simulink. New Jersey: Prentice Hall, 1998, pp. 415-438.
D. Casadei, G. Serre, and K. Tani, "Implementation of a Direct Control Algorithm for Induction Motors Based on Discrete Space Vector Modulation", IEEE Transactions on Power Electronics, vol. 15, no. 4, pp. 769-777, 2000. [Online]. Available: http://dx.doi.org/10.1109/63.849048
K. B. Lee and F. Blaabjerg, "Sensorless DTC-SVM for Induction Motor Driven by a Matrix Converter Using a Parameters Estimation Strategy", IEEE Transactions on Industrial Electronics, vol. 57, no. 3, pp. 512-521, 2008. [Online]. Available: http://dx.doi.org/ 10.1109/TIE.2007.911940
I. Aliskan (1), K. Gulez (2), G. Tuna (3), T. V. Mumcu (2), Y. Altun (2)
(1) Department of Electrical and Electronics Engineering, Bulent Ecevit University, Zonguldak, Turkey
(2) Department of Control and Automation Engineering, Yildiz Technical University, 34220, Istanbul, Turkey
(3) Department of Computer Programming, Edirne Vocational School of Technical Sciences, Trakya University, Edirne, Turkey
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|Author:||Aliskan, I.; Gulez, K.; Tuna, G.; Mumcu, T.V.; Altun, Y.|
|Publication:||Elektronika ir Elektrotechnika|
|Date:||Jun 1, 2013|
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Further Maths is like A Level Mathematics except that there are some new topics and it is more challenging! Further Mathematics continues from A Level Mathematics
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Math problem solver for algebra 2
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https://socratic.org/questions/how-do-i-solve-x-2-12x-27-by-completing-the-square
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math
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How do I solve #x^2 + 12x = -27# by completing the square?
Take the co-efficient of the middle
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https://research.chalmers.se/en/publication/239237
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math
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Simple Formula for Aperture Efficiency Reduction Due to Grating Lobes in Planar Phased Arrays
Journal article, 2016
This paper numerically validates a simple formula to calculate the aperture efficiency reduction due to grating lobes in planar phased arrays. Array antennas with element spacing greater than one wavelength will produce grating lobes. Grating lobes are not a big problem in most new millimeter-wave applications, except for the fact that they reduce the aperture efficiency and thereby normally the directivity. When the element pattern is known, the simple formula can be used to calculate the aperture efficiency in the presence of grating lobes. The formula is verified by the simulations of a large uniformly excited planar slot array. The agreement is good for both broadside radiation and a phased main beam, even if we use the far field of an isolated slot. Using the far field of the embedded slot element gives almost the same results, except when a grating lobe radiates along the ground plane and the isolated element pattern is nonzero in this direction.
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http://mathhelpforum.com/calculus/223380-trig-derivative-5-a.html
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math
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Last edited by Jason76; Oct 22nd 2013 at 11:53 PM.
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I don't think integration by parts is the way, since it's only a Calculus I class. On that homework, we haven't even gotten to substitution yet.
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https://www.coursehero.com/file/8910165/Ch-14-Regression/
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math
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183Stat 250 Gunderson Lecture NotesChapters 3 and 14: Regression AnalysisThe invalid assumption that correlation implies cause is probably among the two orthree most serious and common errors of human reasoning.‐‐Stephen Jay Gould, The Mismeasure of ManDescribing and assessing the significance ofrelationships between variablesis very importantin research. We will first learn how to do this in the case when the two variables arequantitative. Quantitative variables have numerical values that can be ordered according tothose values. We will study the material from Chapters 3 and 14 together. We will merge thetwo chapters together into one overall discussion of these ideas.Main ideaWe wish to study the relationship between two quantitative variables.Generally one variable is the ____RESPONSE______variable, denoted byy.This variable measures the outcome of the studyand is also called the ______DEPENDENT_______ variable.(thought to depend on x)The other variable is the ____EXPLANATORY____variable, denoted byx.It is the variable that is thought to explain the changes we see in the response variable. Theexplanatory variable is also called the ____INDEPENDENT__ variable.The first step in examining the relationship is to use a graph‐ascatterplot‐to display therelationship. We will look for an overall pattern and see if there are any departures from thisoverall pattern.If alinearrelationship appears to be reasonable from the scatterplot, we will take the next stepof finding a model (an equation of a line) to summarize the relationship. The resulting equationmay be used for predicting the response for various values of the explanatory variable. Ifcertain assumptions hold, we can assess the significance of the linear relationship and makesome confidence intervals for our estimations and predictions.Let's begin with an example that we will carry throughout our discussions.
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184Graphing the Relationship: Exam 2 versus Final ScoresHow well does the exam 2 score for a Stats 350 student predict their final exam score?Below are the scores for a random sample ofn= 6 students from a previous term.Exam 2 Score336544646040Final Exam Score538078938858Response(dependent) variabley=FINAL EXAM SCORE .Explanatory(independent) variablex=___EXAM 2 SCORE.Step 1: Examine the data graphically with a scatterplot.Add the points to the scatterplot below:Interpret the scatterplotin terms of ...overall form(is the average pattern look like a straight line or is it curved?)directionof association (positive or negative)strengthof association (how much do the points vary around the average pattern?)anydeviationsfrom the overall form?None here!x = y =
185Describing a Linear Relationship with a Regression LineRegression analysisis the area of statistics used to examine the relationship between aquantitative response variable and one or more explanatory variables. A key element is theestimation of an equationthat describes how, on average, the response variable is related tothe explanatory variables. A regression equation can also be used to make predictions.
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https://www.coursepaper.com/solution-manual/978-0078025754-chapter-1-solution-manual-part-3/
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math
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Problem 1-10A (15 minutes)
1. Return on assets is net income divided by the average total assets.
Kyzera’s return: $65,000 / $250,000 = 0.26 or 26%.
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https://www.gadgetclock.com/pi-day-is-here-and-googles-calculator-will-test-how-well-you-know-the-mathematical-constant/
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math
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Pi Day is here and Google’s calculator will test how well you know the mathematical constant
It’s Pi Day, the nerdiest of holidays as a result of it’s all a couple of mathematical constant that represents the ratio of a circle’s circumference to its diameter (sure, generally writing majors do listen in geometry class). March 14th has develop into generally known as Pi Day as a result of it’s written numerically as 3.14 and pi begins at 3.14 … and goes on indefinitely. Irrational quantity, certainly.
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1. How many Japanese left Greenwood, British Columbia, for Japan (a) prior to January >1, 1946; (b) since January 1, 1946?
2. On what dates did they leave and how many were in each group?
3. Of the total, how many were (a) nationals; (b) citizens of Canada, by naturalization; (e) native born?
Subtopic: REPATRIATION OF JAPANESE
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https://instrumentationtools.com/convert-percentage-to-current/
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math
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Percentage to Current Conversion tool:
This is used to convert the percentage 0 – 100 % to standard current signal (ma) in the range of 4 – 20 ma.
This calculation tool used to find out the equivalent current value in ma from percentage.
1.The above calculation tool designed for a standard 4-20 ma signal conversion.
2.You can convert out of range signal also with the above tool.
(Example: you can calculate for -10 % also and 110% as well)
- Convert current (4-20)ma to Percentage (0-100)%
- Convert Process Variable to Percentage
- Calculate Current (4-20ma) from Process variable PV
- Conversion of Transmitter Output in Percentage to Process Variable
- Instrumentation Calculator
- RTD Calculator : Calculate Resistance from temperature
- Transmitter Current Conversion Tool
- RTD Calculator : Calculate temperature from resistance
- Convert Linear mA to Square root mA
- Linear % To Square root % Conversion
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https://news.met.police.uk/news/tag/convictions-and-sentencings
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math
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News • Nov 27, 2019 20:27 GMT
A man has been found guilty of the murder of a man who was lured to his death in Bromley.
News • Nov 18, 2019 15:59 GMT
Two teenagers have been jailed for the brutal and unprovoked murder of 17-year-old Jodie Chesney in Harold Hill.
News • Nov 13, 2019 17:21 GMT
A man who murdered a woman in her own flat in Tower Hamlets has been jailed.
News • Nov 11, 2019 21:30 GMT
A man has been sentenced to eight years after he pleaded guilty to robbery and possession of a firearm.
News • Oct 11, 2019 19:16 BST
A man has been jailed after an investigation by the Met’s Counter Terrorism Command revealed that he had travelled to Syria where he joined the terrorist group Al Qaeda in 2013.
News • Oct 03, 2019 21:33 BST
A man has been jailed following an aggravated house robbery in Hackney.
News • Oct 03, 2019 17:24 BST
A man has been jailed for raping an 18-year-old woman in Brixton.
News • Oct 03, 2019 16:19 BST
A man who killed his mother and father has pleaded guilty to murder.
News • Oct 01, 2019 15:07 BST
Shane O'Brien has today been found guilty of the murder of Josh Hanson
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http://cpa.monetizador.net/lib/a-guide-to-the-classification-theorem-for-compact-surfaces
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math
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By Jean H Gallier; Dianna Xu
This welcome boon for college students of algebraic topology cuts a much-needed primary direction among different texts whose remedy of the type theorem for compact surfaces is both too formalized and intricate for these with no specified historical past wisdom, or too casual to come up with the money for scholars a finished perception into the topic. Its committed, student-centred procedure info a near-complete evidence of this theorem, largely well-known for its efficacy and formal good looks. The authors current the technical instruments had to set up the strategy successfully in addition to demonstrating their use in a sincerely established, labored instance. learn more... The category Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the basic staff, Orientability -- Homology teams -- The type Theorem for Compact Surfaces. The class Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the elemental team -- Homology teams -- The class Theorem for Compact Surfaces
Read Online or Download A guide to the classification theorem for compact surfaces PDF
Similar topology books
The middle of quantity three comprises lecture notes for seven units of lectures Hilbert gave (often in collaboration with Bernays) at the foundations of arithmetic among 1917 and 1926. those texts make attainable for the 1st time a close reconstruction of the swift improvement of Hilbert’s foundational idea in this interval, and express the expanding dominance of the metamathematical viewpoint in his logical paintings: the emergence of contemporary mathematical good judgment; the categorical elevating of questions of completeness, consistency and decidability for logical platforms; the research of the relative strengths of varied logical calculi; the beginning and evolution of facts concept, and the parallel emergence of Hilbert’s finitist perspective.
A series is a estate, regularly related to concerns of cardinality, of the kin of open subsets of a topological house. (Sample questions: (a) How huge a fmily of pairwise disjoint open units does the gap admit? (b) From an uncountable family members of open units, can one continually extract an uncountable subfamily with the finite intersection estate.
This instruction manual is an advent to set-theoretic topology for college students within the box and for researchers in different components for whom leads to set-theoretic topology could be appropriate. the purpose of the editors has been to make it as self-contained as attainable with no repeating fabric which may simply be present in commonplace texts.
- Metric Spaces: Including Fixed Point Theory and Set-valued Maps
- Topological Spaces
- Geometry and topology: manifolds, varieties, and knots
- Coordinate Geometry and Complex Numbers
Additional resources for A guide to the classification theorem for compact surfaces
1 Simplices and Complexes As explained in Sect. 2, every surface can be triangulated. This is a key ingredient in the proof of the classification theorem. Informally, a triangulation is a collection of triangles satisfying certain adjacency conditions. To give a rigorous definition of a triangulation it is helpful to define the notion of a simplex and of a simplicial complex. It does no harm to define these notions in any dimension. We assume some familiarity with affine spaces. If not, the reader should consult Munkres (Chap.
Ahlfors, L. Sario, Riemann Surfaces, Princeton Math. Series, No. 2. (Princeton University Press, Princeton, 1960) 2. A. Amstrong, Basic Topology, UTM, 1st edn. (Springer, New York, 1983) 3. P. do Carmo, Differential Geometry of Curves and Surfaces (Prentice Hall, New Jersey, 1976) 4. W. Fulton, Algebraic Topology, A first course, GTM vol. 153, 1st edn. (Springer, New York, 1995) 5. W. Hirsch, Differential Topology, GTM vol. 33, 1st edn. (Springer, New York, 1976) 6. C. Kinsey, Topology of Surfaces, UTM, 1st edn.
Indeed, the definition does not assume that a surface is a subspace of any given ambient space, say Rn , for some n. Perhaps, such surfaces should be called “abstract surfaces”. In fact, it can be shown that every surface is a smooth 2-manifold and that every smooth 2-manifold can be embedded in R4 (see Hirsch , Sect. 3). This is somewhat annoying since R4 is hard to visualize! Fortunately, all orientable surfaces can be embedded in R3 (see do Carmo ). Unfortunately, as we mentioned in Sect.
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| 4,499 | 15 |
http://nmhstrategicplan.com/video/ea
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math
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Every NMH student is able to be part of and contribute to a community where all members are healthy, understood, educated and safe.
HOW WE'LL GET THERE:
• Formal vision statement for diversity
• Director of Multicultural Recruitment
• Website to reflect diversity
• Increase of diversity in faculty
• All new faculty audit a DSJ course
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https://affairscloud.com/aptitude-questions-time-and-distance-set-11/
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math
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Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Time and Distance with Explanation, which is common for all the IBPS,SBI,SSC and other competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!
- Arjun, Suji and Nima start running around a circular track and complete one round in 15, 21 and 35 seconds respectively. In how many seconds will the three meet again at the starting point. If they all have started running at the same time ?
E.None of theseAnswer – A.105 seconds
LCM = 15,21,35 = 105 seconds
- Ashwin has to travel from one point to another point in a certain time. Travelling at a speed of 6kmph he reaches 40m late and travelling at a speed of 8kmph he reaches 12 m earlier.What is the distance between this two points ?
E.None of theseAnswer – D.21km
D/6 – 40/60 = d/8 +12/60
d/6 – d/8 = 12/60+40/60
(8-6)d/48 = 52/60
2d/48 = 52/60
D = 52*48/60*2 = 20.8 = 21km
- Sasi travelled a distance of 50km in 7hrs. She travelled the distance partly on foot at 5kmph and partly on bicycle at 8kmph. What is the distance that she travelled on foot ?
E.None of theseAnswer – C.10km
x/5 + 50-x/8 =7
8x+250-5x = 7*40
3x+250 = 280
3x = 30
X = 30/3 = 10km
- Walking at the rate of 4kmph a man covered a certain distance in 2hrs 30min. Running at a speed of 17.5kmph the man cover the same distance in how many min ?
E.None of theseAnswer – A.34min
4*(2+30/60) = 4*2.5 = 10km
17.5kmph then T= 10/17.5 =100/175
= 20/35 = 4/7
Time = 4*60/7 = 34min
- A journey of 192 km between two cities takes two hours less by a fast train than by a slow train. If the average speed of the slow train is 16 km/h less than that of the fast train, then the average speed of the fast train is
E.None of theseAnswer – D.48kmph
192/x = [192/x-16] – 2
192/x-16 – 192/x = 2
Chk from option
192/48-16 – 192/48= 6-4 =2
- The driver of a car sees a school van 70m ahead of him. After 30seconds the school van is 50m behind.If the speed of the car is 34.6kmph, what is the speed of the School Van ?
E.None of theseAnswer – B.20.2kmph
Relative speed =70+50/30 = 4m/s = 4*18/5 = 14.4kmph
Speed of the school van = 34.6 – 14.4= 20.2kmph
- A car driver travels from the plains to the hill station, which are350 km a part at an average speed of 30 km/h. In the return trip he covers the same distance at an average speed of 20 km/h the car. The average speed of the car over the entire distance is
E.None of theseAnswer – A.24kmph
Avg speed = 2xy/x+y
= 2(30)(20)/30+20 = 1200/50 = 24kmph
- If A can row 15 km downstream in 12m and his rowing speed in still water is 56kmph, how much distance can he cover upstream in 20m ?
E.None of theseAnswer – D.12km
Downstream speed = 15*60/12 = 75kmph
Speed of the A in still water = 56kmph
Current speed = 75-56 = 19kmph
Upstream speed = 56-19 = 37kmph
In 56min A can row 37km
In 20 min = 37*20/60 = 12.33km = 12km
- A man crosses a stationary train in 15 minutes. The same train crosses a man in 50 seconds. What is the respective ratio between the speed of the train and the man ?
A.Can’t be determined
E.None of theseAnswer – C.18:1
T : M = d/50 : d/15*60 = l/50 : l/900
Ratio = 900:50 = 90:5 =18:1
- Nikil drove at the speed of 45 kmph. From home to a resort. Returning over the same route, he got stuck in traffic and took an hour longer, also he could drive only at the speed of 40 kmph. How many kilometers did he drive each way ?
E.None of theseAnswer – B.360km
x/40 – x/45 = 1
9x-8x/360 = 1
x/360 = 1
x = 360km
Note : Dear Friends if u know an alternate methods or shortcuts related to any chapter, you can share here.
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https://www.boxingforum24.com/threads/gennady-gennadyvych-golovkin-vs-jermall-charlo.631145/page-3
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math
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Absolutely untrue as usual !! Ive always been the same about the sport Ive spent most of my life around. In EVERY fight all I want to see is a fair fight with the better man on the night getting the win he deserves. No matter who it is. Ok yes I have friends & Fighters I like & I like to see them win But ONLY if the truly win Today it isnt the better man that gets the win all the time its often the one with the$$$$$$$ backing him EG The Vegas cash cows. You know who is going to win those before they leave the dressing rooms. Tell me one fighter Ive claimed won a fight that actually got beaten bad ?? C'mon Pimp.
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CC-MAIN-2019-30
| 618 | 1 |
https://brisam9.blogspot.com/2017/03/heisenbergs-uncertainty-principle.html
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math
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New theory solves uncertainty principle in quantum mechanics.
The uncertainty will continue forever since the scientists assume the space of subatomic particles is the same space that we and large object exists in.
The subatomic particles space is different it has extra dimensions which we cannot feel or recognize.
The reason why we see this strange behavior of subatomic particles because we think in three-dimensions world and assume that these subatomic particles as well move in this three-dimensions world.
Lets assume the subatomic particles have more dimensions via which to move through. One or two or three extra dimensions. Or more.
When the scientists and mathematicians manage to formulate the specification of these subatomic dimensions and formulate their relation with our three-dimensions then the certainty will prevail and the Uncertainty principle will vanish.
Some times we notice strange behaviors of subatomic particles as if they pop in then pop out from somewhere else. We see it strange because we think in three-dimensions world.
The truth is very simple and very normal, all what is happening, the subatomic particles are moving very normal in their dimensions so when they take the forth dimension as a root (where time does not function there. Or this dimension has its own time different from our time), it looks to us as if they are poping in from one place then poping out from different place with no time at all.
When you make the formulas and it does not work, then you must take this in consecration.
The magnetic force either can not function in other dimensions, or it is deformed so it behaves differently in other dimensions.
The same applies to other forces like electric force.
You must not take what functions in our dimensions and apply it in other dimensions. Time and force change in other dimensions.
Even particles like the electron changes, for example the electron is a particle in some dimensions and change to waves in other dimensions. That is why.
Since we live in three-dimensions world and in their specification where they extend forever for billions of light years. Therefore our mind set can only imagine any other dimension to have the same specification of having infinite distance like our dimensions.
We must know that the subatomic dimensions have different specification than our dimensions.
These subatomic dimensions they are huge and colossal for the subatomic particles. May be the ratio of the size of these subatomic dimensions to the size of the subatomic particles, is the same ratio of human size to our universe.
So the subatomic universe must have different values of time and different interaction with forces.
The universe of subatomic particles will have totally different behavior than ours where only great minds can image it and great mathematicians can find the formulas by which it function.
The ratio of one meter to the diameter of our universe = 8.61 E26
Plank constant = 1.986 E25 J.m
So they are so similar.
From this we can assume that the subatomic universe has some relation with Plank constant.
We should consider this world consists from three universes one is smaller than the other in a ratio of plank constant.
Our universe, it is the universe in the middle.
Dark matter universe, it is so huge.
If we divide our universe diameter by dark matter universe diameter we will get plank constant. 6.62607004 × 10-34
Subatomic universe, it is so tiny.
If we divide Subatomic universe diameter by our universe diameter we will get plank constant. 6.62607004 × 10-34
All these three universes coincide in each other.
Each universe has three dimensions. But each universe has a limit after that its dimension will shop at and does not function any more.
For example the subatomic universe its dimensions are so small as small as plank constant can be. But even though this subatomic universe is every where, if we move all over our universe from one galaxy to another the subatomic universe is in every part of any galaxy and in the space between galaxies. But the subatomic universe only has effect and function within the very small limit of its dimensions. So when a particle moves inside subatomic universe it will behave totally different in this subatomic universe, and when it moves out of it to our universe it will behave according to our universe specification.
So we live in a 9 dimensions world where three universe co exist together as if one inside the other but that is not the case.
Each universe has properties different from other universes. And the mater inside it behaves in a way it seems to us so strange. That is why we find it difficult to understand the matter in the Dark matter universe and we find it difficult to understand the behavior of matter in Subatomic universe.
By this new theory we will end the Uncertainty principle once and for all.
But believe me, we will find ourselves in a more puzzling problems to solve.
We must enjoy these new problems because if we solve them all then we will have dull world with no mysteries to solve and enjoy solving them.
In quantum mechanics, the uncertainty principle, also known as Heisenberg's uncertainty principle, is any of a variety of mathematical inequalitiesasserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position x and momentum p, can be known.
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https://www.storyboardthat.com/storyboards/57b2d275/pi-history
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math
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Pi has been around for a long time. Textual evidence dates it all the way back to 1900 BC. There has been many estimates of Pi and what it could be, but most of them were either inaccurate or not close enough.
But an Ancient Greek mathematician, Archimedes of Syracuse, is the first to calculate an accurate estimation of Pi.
He used his method of finding the area of two polygons. One that's inscribed inside a circle and one where the circle is circumscribed. But of course, thanks to computers later on, Pi was more accurate.
Thank you for reading :).
It was also used in construction of ancient structures. The Great Pyramid of Giza, one of the famous monuments, has a ratio of approximately 2 times Pi.
Today, Pi is used in pop culture as well! Movies, shows, etc. would have certain genres that Pi can be used in. It's used at school and it even has its own holiday, Pi Day.
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http://www.solutioninn.com/calculate-the-following-assume-all-payments-are-made-at-the
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math
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Calculate the following (assume all payments are made at the end of the year).
a. What is the value today of a $10,000 payment made in perpetuity assuming a 8% discount rate?
b. Assume the same perpetuity as above but the payments will not begin for another five years. What is the present value of such a perpetuity?
c. What is the present value of a 5 year annuity which pays $10,000 per year and with an interest rate of 8%?
d. You are told you will receive the following cash payments at the end of the next three years:
Year 1: ...... $10,000
Year 2: ...... $25,000
Year 3: ...... $50,000
Assuming a discount rate of 12%, what is present value of all payments?
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| 665 | 9 |
https://www.optics4kids.org/careers/optics-icons/max-planck
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math
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Max Planck won the 1918 Nobel Prize in physics "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta.” Max Planck was studying blackbody radiation, or radiation emitted by a perfect emitter when it is heated. The emitted radiation is not related to the composition, just the temperature of the blackbody. He obtained unphysical results in his calculation unless he quantized the radiation, making it discrete. The radiation emitted was related to a constant, (today known as Planck’s constant). He found that the energy amounts could only be discrete values of E=hn, where E is the energy, h is Planck’s constant, and n is the frequency of radiation. From his work, quantum mechanics began.
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| 750 | 1 |
https://www.mittag-leffler.se/seminar/arrow-induction-and-the-dependent-yoneda-lemma/
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math
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This talk aims to convey why I am excited about the potential of some variant homotopy type theory as a foundation for higher category theory. This will be illustrated by a case study involving the Yoneda lemma for (oo,1)-categories. In homotopy type theory, the contractibility of the based path space is expressed by the principle of “path induction,” which says that identity types are freely generated by reflexivity terms. By an analogy in which arrows in an (oo,1)-category are thought of as directed paths, there is an analogous principle of “arrow induction,” which says that hom types are freely generated by identity arrows. We explain how this unravels to a “dependent” generalization of the Yoneda lemma. This involves joint work with Dominic Verity and Mike Shulman.
Attendees might enjoy googling “path induction” in advance because it feels like magic upon first acquaintance, but this isn’t necessary.
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https://www.dummies.com/programming/electronics/components/electronics-logic-gates-nand-gates/
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math
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Electronics Logic Gates: NAND Gates
A NAND gate is an electronic logic gate that is a combination of an AND gate and a NOT gate. In fact, the name NAND is a contraction of NOT and AND. The output of a NAND gate is LOW when both of the inputs are HIGH. Otherwise, the output of the NAND gate is HIGH.
|Input A||Input B||Output|
The standard symbol for a NAND gate is the same as the symbol for an AND gate, with the addition of a circle at the output. As in the symbol for a NOT gate, the circle indicates that the output is inverted. In other words, a NAND gate is an AND gate whose output is inverted.
The NAND gate is special because you can use various combinations of NAND gates to create AND, OR, or NOT gates. Thus, a logic network that consists of a combination of NOT, AND, and OR gates can be created with an equivalent combination of just NAND gates. For this reason, the NAND gate is called a universal gate.
Another interesting thing about the NAND gate is that it can be used as a kind of OR gate that tests for LOW inputs instead of HIGH inputs. In other words, the output of a NAND gate is HIGH whenever either of the inputs are LOW.
This characteristic of NAND gates is useful in many situations. For example, a sensor that detects whether a door is open is essentially a simple switch that is closed when the door is closed and open when the door is open. When the door is closed, current flows through the switch so the signal from the sensor is HIGH. When the door is opened, current stops flowing and the signal goes LOW.
NAND gates can be used to test for a LOW input on any of eight sensors.
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https://repository.rudn.ru/en/records/article/record/39072/
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math
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Applicable Analysis. 2019.
The article searched on mathematics and numerical solutions for the nonlinear pendulum (Chaotic pendulum). The numerical solution that was used for our research suitably the pseudospectral methods. With these equations, we studied and calculated on the interval [−1, 1], with boundary conditions already known. We used the software Mathematica 10.4 to calculate the results of the problems. © Siberian Federal University. All rights reserved.
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https://avesis.comu.edu.tr/yayin/ba48036a-4bc8-4aec-91f4-dde07702a913/evaluation-of-the-auxiliary-function-g-nsq-using-basic-overlap-integrals-over-slater-type-orbitals
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math
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JOURNAL OF MATHEMATICAL CHEMISTRY, vol.44, no.3, pp.749-754, 2008 (SCI-Expanded)
This paper presents a computationally efficient formula in terms of basic overlap integrals over Slater type orbitals (STOs) for the evaluation of auxiliary function G(-ns)(q) which plays a central role in calculations of multicenter molecular integrals. The basic overlap integrals are calculated with the help of recurrence relations. The resulting simple analytical formula for the auxiliary function G(-ns)(q) (p(a), p, pt) is completely general for p(a) <= 1.2 and arbitrary values of parameters p and pt. The efficiency of calculation of auxiliary function G(-ns)(q) is compared with other method.
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https://zims-en.kiwix.campusafrica.gos.orange.com/wikipedia_en_all_nopic/A/Volterra_integral_equation
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math
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Volterra integral equation
A linear Volterra equation of the first kind is
where ƒ is a given function and x is an unknown function to be solved for. A linear Volterra equation of the second kind is
In operator theory, and in Fredholm theory, the corresponding operators are called Volterra operators. A useful method to solve such equations, the Adomian decomposition method, is due to George Adomian.
A linear Volterra integral equation is a convolution equation if
The Volterra integral equations were introduced by Vito Volterra and then studied by Traian Lalescu in his 1908 thesis, Sur les équations de Volterra, written under the direction of Émile Picard. In 1911, Lalescu wrote the first book ever on integral equations.
Conversion of Volterra equation of the First Kind to the Second Kind
A linear Volterra equation equation of the first kind can always be reduced to a linear Volterra equation of the second kind, assuming that . Taking the derivative of the first kind Volterra equation gives us:
Dividing through by yields:
Defining and completes the transformation of the first kind equation into a linear Volterra equation of the second kind.
Numerical solution using trapezoidal rule
A standard method for computing the numerical solution of a linear Volterra equation of the second kind is the trapezoidal rule, which for equally-spaced subintervals is given by:
Assuming equal spacing for the subintervals, the integral component of the Volterra equation may be approximated by:
Defining , , and , we have the system of linear equations:
This is equivalent to the matrix equation:
For well-behaved kernels, the trapezoidal rule tends to work well.
- Traian Lalescu, Introduction à la théorie des équations intégrales. Avec une préface de É. Picard, Paris: A. Hermann et Fils, 1912. VII + 152 pp.
- Hazewinkel, Michiel, ed. (2001) , "Volterra equation", Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
- Weisstein, Eric W. "Volterra Integral Equation of the First Kind". MathWorld.
- Weisstein, Eric W. "Volterra Integral Equation of the Second Kind". MathWorld.
- Integral Equations: Exact Solutions at EqWorld: The World of Mathematical Equations
- Press, WH; Teukolsky, SA; Vetterling, WT; Flannery, BP (2007). "Section 19.2. Volterra Equations". Numerical Recipes: The Art of Scientific Computing (3rd ed.). New York: Cambridge University Press. ISBN 978-0-521-88068-8.
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http://www.silmarillionwritersguild.org/archive/home/reviews.php?type=ST&item=318
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math
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Comments For A Mary Sue Among Us
I had actually been thinking on what would happen to elves appearing in this age, and that they'd have to do a crash course in modern life. So glad you thought that too and put it in!
I know Dawn picked up on the tense thing, I don't write myself so I wouldn't have been any help there.
'Stay away or I'll call the police' made me giggle. NOT what they were expecting eh?
Looking forward to more.
(this is my first review, it probably sucks sorry)
Thanks for taking time to review and for the helpful comment! I'm enjoying writing this story and I'd be over the moon if someone just read it, receiving reviews is a bonus.
I liked that line too! I have a lot more "irreverent" and embarrassing scenes up for Mary Sue and the 7 Elf Lords so please bear with me.
Hi, there! I'm so pleased to see you posting here. :)
A nice first chapter. I loved the brothers (of course). They're so easy to pick on, aren't they? The twins are interesting; I'm so glad to see that you didn't take the usual Amrod and Amras Weasley route for this. And the Valar, sounding so self-important. I'm really interested to see where you take this. :)
A couple of nitpicks: The tense changes a couple of times from past tense to present tense, which was a little jarring. And dialogue--as I've learned it anyway--should be set off with a comma and not a period, as in,
Maedhros said, "Dawn is my biggest fangirl, didn't you know?"
"No," Celegorm snorted. "That's me."
That was a silly quote, but the point, I hope, stands. ;)
So, in answer to your first post here, I think it's appropriate to give you a Mary Sue's reply:
Write mre PLZ!!11one1!!1!
Noted on that and thanks very much for the feedback!
Funny you should say the "Weasley" thing--that will come up in one form or another in the coming chapters. I've decided to shorten this to 10 chapters instead of 12 and changed a lot of things on the previous outline I sent you--hopefully for the better.
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http://mmessayqtau.mestudio.us/indiana-high-school-math-teaching.html
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math
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Jobs on monster search for math teacher job opportunities in indiana and apply for the job that's right for you emma donnan middle school - math teacher. Sherry gramer is a math teacher at ben davis high school she received her bachelors degree in math education from the university of michigan and a masters. To prepare for this transition, all indiana school districts, charter schools, positions from the indiana department of education, posted, expires. Ball state university's certificate in middle school mathematics education is a graduate-level learn more about state authorizations for non-indiana students.
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A dismal 32% of would-be indiana math teachers passed the core middle school math test and only 18% of aspiring science teachers. Middle school science activity days – free for teachers of grades 6-8 the hamte mathematics teacher leadership conference is moving to a larger. Get the best indiana core study guides each comes with the 240tutoring middle school mathematics middle school study guides.
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| 4,257 | 7 |
http://provence.cidel.com/kindle/algebraic-and-geometric-surgery-oxford-mathematical-monographs
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math
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By Andrew Ranicki
Whitehead torsion, Poincare complexes, round fibrations and quadratic kinds and formations. whereas targeting the elemental mechanics of surgical procedure, this ebook comprises many labored examples, invaluable drawings for representation of the algebra and references for extra reading.
Read or Download Algebraic and Geometric Surgery (Oxford Mathematical Monographs) PDF
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This advent to algebraic geometry assumes in simple terms the traditional history of undergraduate algebra and is very compatible for people with no past touch with the topic. The e-book focusses on projective algebraic geometry over an algebraically closed base box. It begins with easily-formulated issues of non-trivial recommendations – for instance, Bézout’s theorem and the matter of rational curves – and makes use of those difficulties to introduce the elemental instruments of recent algebraic geometry: measurement; singularities; sheaves; forms; and cohomology.
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Extra info for Algebraic and Geometric Surgery (Oxford Mathematical Monographs)
Algebraic and Geometric Surgery (Oxford Mathematical Monographs) by Andrew Ranicki
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| 2,511 | 14 |
https://starkle.in/pages/size-chart
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math
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Measure An Existing Ring
1. Select an existing ring that fits the desired finger.
2. Measure the internal diameter of the ring (in mm).
3. Use the chart below to determine you ring size.
Measure Your Finger
1. Take a piece of Paper and cut a
straight strip from it.
2. Wrap the paper around the finger for which
you want the ring. Now mark the point where
the paper meets.
3. Take a ruler and measure the distance.
The measured distance is the circumference of your finger.
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http://physics.stackexchange.com/tags/weak-interaction/new
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math
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New answers tagged weak-interaction
I am very bad at drawingin "paint", but the process can go as antineutrino +neutrino to Z0 , Z0 to s antis (or up antiup), a gluon vertex from the quark to an up antiup (or strange antistrange quark) the parenthesis are the alternate diagram. , So it is not forbidden, it has two weak vertices and so very small cross section.
Your first diagram is wrong, since there is no vertex in a Lorentz invariant theory where three fermions and a vector meet. However, I don't see why you say the interaction is forbidden. It would surely be insanely suppressed since amplitudes are extremely weak, but I don't see a problem with the diagram (for instance): Notice that quarks mix, so the ...
The problem with this process is, that there is no term in the standard model which allows a coupling of a fermion a W-boson and a quark-antiquark pair. Even with the neutrino having no charge, you have to take this arrow you draw on the fermion line seriously, so the fermion flow is violated at this interaction points. Furthermore you can only couple ...
Top 50 recent answers are included
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https://www.coursehero.com/file/146502/hw2answers/
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math
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This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Homework Assignment 2 Answers PHYS 206: The Milky Way Inside and Out In the following multiple choice items, there may be one or more correct answers. 1. Galileo Galilei: (a) invented the telescope. (b) was the first to use the telescope for astronomy. (c) observed the phases of Venus, and concluded that it supported the Ptolemaic universe. (d) observed sunspots, and used them to measure the rotational period of the sun. (e) knew about the proposals of Copernicus and Kepler that the earth moved around the sun. 2. Isaac Newton: (a) showed that white light can be split with a prism into exactly two colors, red and blue. (b) proposed a law of gravity, in which the force between two bodies is proportional to the product of their masses, and inversely proportional to the square of the distance between them. (c) studied both light and gravity. (d) constructed the first telescope. 3. Light: (a) comes in two different modes: it can be either a wave, or it can be a particle. (b) has a dual nature: all light can be described as a wave and as a particle. (c) can be characterized by either a wavelength or energy (d) travels at a constant speed in a vacuum, regardless of either the wavelength or frequency. (e) has a higher velocity at higher frequencies. 4. (a) Write down the relationship between the velocity of light and its frequency and wavelength, using the commonly used variable letters. (b) What is the speed of light in a vacuum, in units of cm/sec? (c) If the wavelength of light is 1 cm, what is its frequency? (d) If the frequency of light is 1 s- 1 what is its wavelength? a) c = fλ b) c = 3 × 10 10 cm / sec . c) f = c/λ = (3 × 10 10 cm / sec) / (1cm) = 3 × 10 10 /sec d) λ = c/f = (3 × 10 10 cm / sec) / (1s- 1 ) = 3 × 10 10 cm . 5. Give an approximate wavelength (in meters) for Note: These are approximate wavelengths; there is no hard definition : (a) radio waves. 0.0005-0.3 m (b) infra-red radiation 1 × 10- 6 – 30 × 10- 6 m (c) optical light. 300 × 10- 9-- 700 × 10- 9 m (d) ultra-violet radiation. 20 × 10- 9-- 200 × 10- 9 (e) X-ray radiation 0 . 1 × 10- 10-- 100 × 10- 10 m 6. Which of the following is not electromagnetic radiation: (a) neutrinos (b) gravity waves (c) gamma-rays (d) light from a light bulb. 7. Grouping stars by constellation: (a) permits one to refer to them in discussion, so that they can be talked about. (b) also groups them physically, since stars so close together on the sky are all probably at the same distance. 1 (c) does not clarify the relationship between the constellations, such as where they are located with respect to one another on the sky....
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This homework help was uploaded on 04/20/2008 for the course PHYSICS 206 taught by Professor Rutledge during the Winter '08 term at McGill.
- Winter '08
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https://travis.giggy.com/miki/115.020.30.08.html
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math
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8. Portfolio Expected Return and Variance
m. calculate and interpret covariance given a joint probability function;
What is the expected return of a portfolio of assets?
The expected return of a portfolio of assets is the market-weighted average of the expected returns on the individual assets in the portfolio.
What is the formula for variance of a portfolio's return?
- It consists of two components: the weighted average of the variance for individual assets and the weighted covariance between pairs of individual assets
- $$\sigma^2(R_p) = w_1^2 \sigma^2(R_1) + w_2^2 \sigma^2(R_2) + 2 w_1 w_2 Cov(R_1, R_2)$$
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https://computingreviews.com/review/review_review.cfm?review_id=147127
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math
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There are some similarities between areas of computer specializations and mathematical finance, for example, stochastic methods and statistics or risk modeling. It should be interesting for computer specialists to get acquainted with how these methods are used in a totally different field, and Davis’ book will be helpful with this. On the other hand, this might be a good first book on finance-related problems, where computer methods have been used for some years. Therefore, a professional in computer science who would like to shift interests a little bit will find a good introduction.
The book shows the basic knowledge of a quant, that is, a specialist working on the mathematical modeling of finances (for instance, investments in a stock exchange). Chapter 1 is an introduction to the whole field, covering fundamental concepts on how money is treated in financial modeling and how financial markets work, including their basic transactions. The next chapter introduces the related concept of risk and its modeling. Readers acquainted with time series analysis can find well-known models, though applied here in a different context. Chapter 3 presents the most classical topic in mathematical finance: option pricing.
Next, chapter 4 takes into account mathematical finance models and the fact that money also has a cost, that is, interest rate. The next chapter covers the quantification of credit risk. Chapter 6 then elaborates on the next big issue in finance: fund management. Chapter 7 is devoted to risk management, while the last chapter discusses the 2008 crisis, including the new avenues in mathematical finance taken up in response. All the topics are presented in a similar way: first basic intuitions and fundamental concepts are introduced, and then Davis covers some aspects of mathematical modeling, related examples, and most prominent results.
For a book published in the “A Very Short Introduction” series, Mathematical finance is not that easy to follow and for sure is not for every reader (contrary to some other books in this series that can be comprehended without previous background knowledge). First, to understand the mathematical background, readers should know quite a lot of theory (on probability and calculus). What I mean is it would be good to have some intuitions provided by graduate-level courses. Second, computer specialists are often familiar with mathematical modeling grounded in discrete mathematics, which makes grasping the way mathematical modeling is done by quants in finance not that easy. Nevertheless, the author strives to explain all the basic ideas in order to show more advanced issues. Generally, such a short book can provide no more than a taste and some basic results. Davis’ book may even spur interested readers to reach for a rich book like Options, futures, and other derivatives .
More reviews about this item: Amazon
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https://www.cs.cmu.edu/puzzle/puzzle31.html
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math
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Puzzle 31: Number Games
Its raining outside and Alfonso and Bernadette are bored.
Alfonso suggests the following games:
(a) Two players alternatively erase some 9 numbers from the sequence 1,2,...,101 until only two remain. The player that starts wins x−54 dollars from the player that plays second. Here x is the difference between the remaining two numbers. Would you rather be the first or the second player?
(b) Two players alternatively erase one number from the sequence 1,2,...,27 until only two numbers remain. The first player wins if the sum of these numbers is divisible by 5; otherwise the second player wins. Who has a winning strategy?
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s3://commoncrawl/crawl-data/CC-MAIN-2023-23/segments/1685224643462.13/warc/CC-MAIN-20230528015553-20230528045553-00255.warc.gz
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CC-MAIN-2023-23
| 651 | 5 |
http://www.voy.com/15900/92916.html
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math
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|[ Login ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]|
There is a scene in the last "Halloween" movie where it was like, "OMG! Ok...so he's...alright with killing children now too???" Disturbing. But, bringing back the 'Silver Shamrock' kid's masks from part 3, and just...like...leaving them in the park like that? Wow. This one is going to get pretty damn dark!
Hi, 80's kids! Remember this song haunting your dreams? I certainly do! :P
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https://www.omnicalculator.com/physics/porosity-and-permeability
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math
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Porosity and Permeability Calculator
This porosity and permeability calculator uses Darcy's law to calculate these two properties of a porous material with a fluid flowing through it. The main application for this calculation is in the earth sciences to understand how water, oil, gas, etc., travel through the different layers of the earth.
The diagram above represents how we model a fluid moving through a porous substance due to a pressure gradient on either side of it.
In this accompanying article to our porosity and permeability calculator, we will:
- Present Darcy's law equation;
- Explain how to calculate permeability; and
- Show how to calculate porosity.
You might also be interested in another topic related to fluids, for example, the hydraulic conductivity calculator. Be sure to check it!
Darcy's law – how to calculate permeability
Darcy's law is an approximation used extensively in the earth sciences to determine the characteristics of a material. It models the flow of a fluid through a porous medium. The equation for Darcy's law is:
- – Discharge rate, in units of volume per time: meet this quantity at the coefficient of discharge calculator;
- – Permeability of the material;
- – Cross-sectional area of the material;
- – Dynamic viscosity of the fluid (if you know the kinematic viscosity, use the Poise-Stokes converter for an easy fix);
- – Distance the fluid travels through the material; and
- – Pressure difference either side of the material.
We can rearrange this equation to find the permeability in terms of the other quantities that we can measure from experiments:
The widely used unit for permeability is appropriately the darcy () or millidarcy (). The dimension of the darcy unit is (length squared). Therefore, you can also represent permeability using the SI units system as (meters squared) – 1 darcy is .
What is porosity? How to calculate porosity
When we ask "What is the porosity of a substance?", it means to ask how much of the volume of the substance is empty compared to the space taken up by the solid material. The greater the porosity, the more open space per unit volume of material.
When using the Darcy equation, the porosity of a substance means how well it allows a fluid to flow through it. The higher the porosity, the better fluids flow through it, but only if the voids are well connected. Let's first look at the equation for fluid flow porosity, and then we'll unpack it and interpret it.
The equation for porosity is:
- – Porosity of the material; and
- – Time taken for the fluid to travel the distance through the substance with cross-sectional area .
This equation tells us that the more porous a material is, the quicker the discharge rate is for a given volume of material. Porosity is a dimensionless quantity.
How to use the porosity and permeability calculator
Using our porosity and permeability calculator is relatively straightforward. First, we define the fluid pressure gradient across the substance. You can either enter the pressure on both sides or input the pressure difference directly.
Continue to enter the following terms:
- The distance the fluid flows through the material.
- The cross-sectional area of the material.
- The discharge rate of fluid leaving the material.
- The viscosity of the fluid.
You will then see that we have enough information to calculate the permeability, and you will be rewarded with a result.
To calculate the porosity, input the residence time, which is the time taken for the fluid to move through the material. And there you have it – the porosity of your substance.
💡 If you have values in different units, first change the unit of the variable by clicking on the unit to open a drop-down list of alternative units.
What is k in Darcy's law?
The term k in Darcy's law represents the permeability of a material and is a measure of how easily a fluid (liquid or gas) can flow through a porous substance, such as sand, rock, etc.
How has Darcy's law been verified in nature?
Henry Darcy based the law named after him on experiments he performed that involved water flow through beds of sand. His work was the foundation of hydrogeology, one of the earth sciences.
How do I calculate coefficient of permeability?
To calculate the permeability of a porous material, use Darcy's law equation:
- Multiply together the fluid discharge rate, dynamic viscosity, and distance traveled.
- Divide the result from Step one by the cross-sectional area of the material multiplied by the pressure difference on either side of the material.
- The result is the material's permeability the fluid travels through.
What is Darcy velocity?
Darcy velocity is defined as the rate flow of a fluid per unit of the cross-sectional area of a porous material. It depends on the porosity of the material and the pressure difference that drives the fluid flow.
What is the permeability of soil?
1 to 10 darcy, depending on soil type. A very sandy soil will be more permeable (~10 darcy), whereas a very peaty soil with lots of organic material will be less permeable (~1 darcy).
What is the difference between porosity and permeability?
Porosity is a measure of the amount of void space in a material. Permeability is a measure of how well fluids flow through a material. You can have a material with very high porosity, but if the voids in the material are not connected, fluids will not flow through it, and its permeability will be lower.
What is the porosity of soil?
The porosity of soil depends on the soil type. For sandy soils, it is between 0.36 and 0.43, whereas for soil with a lot of clay content, it is between 0.51 and 0.58.
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https://tuf.edu.pk/course-detail/eyJpdiI6ImtnQkZSaHM0bmlvNzNaUlwvNXM1c0ZRPT0iLCJ2YWx1ZSI6Inhvc1cxckFDOTZIUEJcL2NuWGhQelVBPT0iLCJtYWMiOiIwYjIwZjEzNTBlMjk2YzAyZGJkMTEwYjlkYWI2MzY3YjFhMTUxNmMwZWRkY2RiODBlMzc4M2U4MmNmYjgwNDkxIn0=
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math
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Upon completion of the BS Mathematics program at TUF, Students majoring in Mathematics attain proficiency in:
• The ability to recognize, evaluate, integrate, and apply different types of information and knowledge to form independent judgments.
• Analytical and logical thinking and the habit of drawing conclusions based on quantitative information.
• The ability to measure and understand complex situations, choose among several theoretically proper mathematical methods of solution and continue in the face of difficulty.
• The ability to communicate and interact effectively with different audiences, developing their ability to collaborate intellectually and creatively in diverse situations.
• The ability to understand the basic rules of logic, including the role of axioms or assumptions and appreciate the role of mathematical proof in formal deductive reasoning in everyday life.
The mission of the Department of Mathematics at TUF is to provide undergraduate students with a strong base that leads to success in successive careers and educational programs. This is capable by having our students demonstrate deep knowledge in core classes, read, analyze and write proofs, and communicate mathematical ideas written and verbally. The Department of Mathematics supports the University mission of academic distinction in teaching, scholarship and service by providing a superior educational opportunity for students by promoting all aspects of teaching, learning, and researching mathematics.
8 Semesters, 4 years
Intermediate or equivalent with mathematics at least 45% marks.
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| 1,596 | 9 |
https://books.google.com/books/about/A_Companion_to_Theoretical_Econometrics.html?id=xs55E7FsMHMC&hl=en
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math
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A Companion to Theoretical Econometrics
Badi H. Baltagi
John Wiley & Sons, Apr 15, 2008 - Business & Economics - 736 pages
A Companion to Theoretical Econometrics provides a comprehensive reference to the basics of econometrics. This companion focuses on the foundations of the field and at the same time integrates popular topics often encountered by practitioners. The chapters are written by international experts and provide up-to-date research in areas not usually covered by standard econometric texts.
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2SLS alternative analysis Anselin applications approach artificial regression assume assumption autocorrelation autoregressive Bayesian bootstrap chapter choice coefficients cointegrating collinearity computed conditional mean consider consistent estimator convergence covariance matrix defined denote density discussed duration dynamic Econometrica economic efficiency equation error example explanatory variables forecast function future component Gibbs sampling heteroskedasticity hypothesis testing identified implies inference instrumental variables Journal of Econometrics least squares estimator likelihood function linear regression linear regression model loglikelihood methods Monte Carlo multivariate nonlinear nonnested nonparametric normally distributed null hypothesis observations obtained optimal panel data parameters Pesaran posterior probit problem procedure random variables regressors residuals restrictions Section seemingly unrelated regressions semiparametric sequence serial correlation simulation spatial specification tests stationary stochastic structural test statistic Theorem theory tion unit root values variance vector zero
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| 1,781 | 8 |
https://www.cheenta.com/lessons/test-of-mathematics-solution-subjective-11/
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math
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This is a Test of Mathematics Solution (from ISI Entrance). The book, Test of Mathematics at 10+2 Level is Published by East West Press. This problem book is indispensable for the preparation of I.S.I. B.Stat and B.Math Entrance.
Also see: Cheenta I.S.I. & C.M.I. Entrance Course
Let x and n be positive integers such that is a prime number. Then show that n is a prime number.
(For small values of x and n it is easy to show that the given fact is true. We prove for x>>1)
Suppose n is not a prime. Then n = ab (where both a and b are not equal to 1). We may write the given expression in blocks of a terms; there will be b such blocks.
But this gives a factorization of a prime number which is not possible (as x>>1 none of the factor equals 1). Hence we find a contradiction implying n is prime.
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https://www.wyzant.com/Brentwood_NY_Math_tutors.aspx
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math
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Math Tutor--High School/College levels
I am a retired math
professor, available for tutoring high school or college students. Prior to retiring, I taught Math
ematics on a full-time basis for 8 years at the university level and for 19 years in a community college setting. The...
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Algebra 1, Algebra 2, Calculus
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http://qa.nmrwiki.org/question/404/nmr-transmission-polarized-magnetic-field-and-rotation-along-x-and-y-axis
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math
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I am trying to understand the workings of the NMR transmission more closely. I understand how the sinusoidally varying magnetic field created by the coil is used to tip the protons by 90deg.
I am having hard time understanding however, how using the phase shifted versions of the transmitted wave, one could achieve a 90(x') versus. 90(y') "tipping" of the protons?
Another question I have is why is circularly polarized magnetic field is required for this?
I have RF background, but I am new to the NMR community, and trying to fill the gap between how RF works and how it is used for the purpose of NMR.
I appreciate any help in answering these questions, or even if someone points me to a textbook or research article that explains this...
asked May 19 '12 at 13:31
A complete description of magnetization in the rotating frame is much too lengthy for discussion here. A good description of the whole concept of the rotating frame and how a pulse effects the magnetization vector(s) is given in a very old but quite good book called "Pulse and Fourier Transform NMR" by TC Farrar and ED Becker. You can also look at "Modern NMR Techniques for Chemistry Research" by Andrew Derome and "Nuclear Magnetic Resonance" by PJ Hore. These are just a few that come to mind - I know there are many more. These books explain the whole concept of the phase of the B1 field and how it relates to the rotating frame very well. I also have a Power Point presentation that I can send you (some of it based on Farrar and Becker) that I use in teaching.
A very enlightening paper is "The Magnetic Resonance Myth of Radio Waves" by DI Hoult (Concepts in Magnetic Resonance. 1, 1 (1989)) which helps to counter some of the strange beliefs held in the Medical MRI community and sometimes by spectroscopy books aimed at organic chemists.
Although the vector description of pulse NMR assumes a circularly polarized B1 field, NMR spectrometers typically use a linearly polarized B1 field - although it is certainly possible to generate a circularly polarized field using two coils in quadrature. Any linearly polarized field can be decomposed into two counter rotating circularly polarized fields. You simply ignore the one that is rotating in the "wrong" direction at the price of throwing away half of your transmitter power. This is exactly the same as the 3 dB loss that occurs between linear and circularly porarized antennas at two ends of a communication link.
answered May 22 '12 at 09:01
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https://www.physicsforums.com/threads/what-happens-when-you-connect-a-charged-capacitor-to-2-uncharged-capacitors.584729/
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math
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For my electronics work I have a question to answer: "A 1000V source is used to fully charge a 1μF capacitor. The capacitor is then disconnected from the source and connected to two additional capacitors (2μF and 8μF) as shown in the circuit schematic below. a) Calculate the final voltage across the 1μF capacitor after connecting it to the two capcitors. b) Calculate the variation of energy associated with this process." For the first part am I supposed to act as if the three capacitors are in parallel or what? And for the second bit what is the variation of energy? Any help would be greatly appreciated.
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https://upprevention.org/and/2166-euclidean-and-non-euclidean-geometries-development-and-history-4th-edition-377-641.php
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math
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Euclidean & Non-Euclidean Geometries: Development and History by Marvin Jay Greenberg35-year-old-Rick-from-January-2018: Well, I just finished reading a book about the history and development of Non-Euclidean Geometry.
15-year-old-Rick-from-January 1998: Wait, are you me from the future? How did you get here?
35yo-Rick: It would take too long to explain. Just ask Gödel.
15yo-Rick: Okay, but why did you just read a book about geometry? Surely Im still not in school 20 years from now!
35yo-Rick: I read it for fun.
15yo-Rick: Fun?! You think Geometry is fun? Oh no. Please tell me this isnt who I grow up to become.
Okay, this sounds crazy to my 15 year old self, and probably crazy to a lot of other people, but I have found that some of the most calming things to read are math books. Something about the order and elegance of a good proof, something I also appreciate in formal logic. I picked this book to read particularly because one of the classes I teach to high schoolers covers Euclids definitions, common notions, and postulates. Its not a math class, but we quickly cover Euclid for philosophical purposes. Mainly we talk about his axiomatic method and how it informed Descartes later on. However, even though its only 2 days of class, I wanted to have a better understanding of non-Euclidean geometry and of the problems with Euclids 5th postulate.
Enter Marvin Greenbergs excellent book. There are 10 chapters and 2 appendices that intend to take the reader on a journey through the history of geometry while rigorously inculcating the principles of geometric proofs. Its kind of an all-in-one program, and Greenberg offers ideas on how to teach the book for various classes in the introduction. There are chapters to work through with a math class of moderate skill (Chapters 1-6 and the beginning of 7 [minus all the major exercises]). There are chapters to work through with a class of liberal arts students (Chapters 1, 2, 5, parts of 6 and 7, and 8). There are chapters to work through with a math class of advanced students (Chapters 1-7 with all exercises).
Being a glutton for punishment, I decided to work through all the chapters and do the review exercises (but not the major exercises, because Im not that crazy). I found that I was able to follow the discussion well through the first 6 chapters, and I made it part of the way through chapter 7 before I was completely over my head. Chapter 8 was a philosophical overview of the implications of non-Euclidean geometry for philosophy of mathematics; that was a great chapter. Chapters 9 and 10 made my brain hurt, and would have required far more time than I wanted to spend in order to fully grasp. I dont know how much information Ill retain, but there were some great quotes and I think Ive got a good, basic grasp of how non-Euclidean geometry was discovered and what its all about. (Hint: It has nothing to do with Cthulhu. Thanks for confusing me, H. P. Lovecraft!)
Another thing this book reinforced for me was my long-held belief that math is the closest thing to actual magic that exists in the world. If there were really a school for witchcraft and wizardry, it would look a lot less like Hogwarts and a lot more like a school full of people doing abstract mathematics and pure analytic geometry.
ISBN 13: 9780716799481
This is the definitive presentation of the history, development and philosophical significance of non-Euclidean geometry as well as of the rigorous foundations for it and for elementary Euclidean geometry, essentially according to Hilbert. Appropriate for liberal arts students, prospective high school teachers, math. The first eight chapters are mostly accessible to any educated reader; the last two chapters and the two appendices contain more advanced material, such as the classification of motions, hyperbolic trigonometry, hyperbolic constructions, classification of Hilbert planes and an introduction to Riemannian geometry. Convert currency. Add to Basket.
Goodreads helps you keep track of books you want to read. Want to Read saving…. Want to Read Currently Reading Read. Other editions. Enlarge cover. Error rating book.
Freeman and Company , 41 Madison Ave. For much of the last half of the twentieth century, college level mathematics textbooks, particularly calculus texts, have included short, marginal, historical blurbs; a short bio of Brook Taylor in the section on Taylor series, for example. Such inclusions can be interesting for the faculty member who has not had much exposure to the history of mathematics or the student with a pre-existing interest. As a student I found these excerpts tantalizing and they surely whetted my appetite for mathematics history. However, as a professor I have found them frustrating as they rarely say enough about the mathematics itself.
This is the definitive presentation of the history, development and philosophical significance of non-Euclidean geometry as well as of the rigorous foundations for it and for elementary Euclidean geometry, essentially according to Hilbert. Appropriate for liberal arts students, prospective high school teachers, math. The first eight chapters are mostly accessible to any educated reader; the last two chapters and the two appendices contain more advanced material, such as the classification of motions, hyperbolic trigonometry, hyperbolic constructions, classification of Hilbert planes and an introduction to Riemannian geometry. Marvin J. He received his undergraduate degree from Columbia University, where he was a Ford Scholar.
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http://www.shyam-enterprise.com/what-precisely-is-discrete-t/
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math
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What the heck is discrete math? What specifically does likelihood indicate in math? This shall clarify this matter, also acknowledged as analysis. I’ll reveal just what exactly can be undertaken with it, and the world of chances could be outlined as discrete.
Discrete Arithmetic are parts of arithmetic which run in an way. Whereby effects are assumed to be regular, Normally the idea of math goes hand in hand with this of integration. General core is. General coronary heart issues that arithmetic doubts will have to use a commonplace like”importance”clearness” to be sure that students have precisely accurately the exceptionally precise ability in the discipline.
Figuring out the notion of prospects is a part of exactly what specifically is http://academic.brooklyn.cuny.edu/english/melani/cs6/critical.html discrete math. Likelihood is really a measure of how in all likelihood an item is always to appear. This can be understood to get the chance of the party going on, which will be expressed as a chance, the array of situations that function is highly doubtless to arise, or possibly and so the likelihood an party will happen, or maybe even potentially a”likelihood of what is actually gonna happen”.
They are not speaking about a arithmetic college student, when someone allows you to know that probability will be a sophisticated prone to understand. Likelihood seems a subject matter that is not possible to understand if you happen to be nearly anything in any way like plenty of mathematics pupils. But inside occasion that it is possible to recognize chance, its an item which make living simple and handymastering it may perhaps shift your living.
You certainly will see distinctive definitions of likelihood in math. The most straightforward is the typical: the likelihood of the occasion taking place break up through the variety of occasions which purpose is rather in all likelihood that happens. Seeing that it can be employed to consider the probability of functions chance is substantial, as well as at the same time, it might be utilised to compute possibilities, that are utilised to supply greater depth.
As described earlier than, what is totally different math may very well be outlined as the observe of establishing an mathematical equation to evaluate just a few quantities that can be linked. The main ingredient is admittedly that counting. As the for a longer time really difficult expression is quite often the an individual counting can be believed as carrying the variance in between a small number of amounts.
The theory about all sorts of things is discrete z is utilised to explain how realizing the gap among 2 amounts can give insight. By means of occasion, in case you are looking for to have an understanding of how significantly strength continues to be stored inside of a battery, you have to use what is totally different math to compute the gap involving your most recent and also voltage.
Recognizing the hole among two amounts could possibly be your coronary heart of that which is discrete arithmetic. Its the hole somewhere between the two amounts and will be utilised to acquire out the power which is saved in the batterylifestyle. Considering that the voltage and existing are joined with 1 a second, being familiar with the hole involving your two amounts can offer you perception into how they relate.
You can determine the amount of electrical power that is definitely stored in your battery, of course in addition, you can make the most of what is discrete math, inside the celebration that you would like to be aware of how a lot of electricity have been saved from your battery. And you can make the most of this material to get everyday living. This is really a system which has a minor time.
What is prevalent heart for K-12 instruction, may perhaps clearly quite possibly not be the same for some one who is a fancy math scholar. One time you graduate from school, you are likely to hold the proficiency to get a master’s degree and take advantage of what is arithmetic to do calculus or other matters that can be comparable.
What’s distinct t is generally. It really is a solution, together with loads of perform isneeded touse this facts. To be able to establish intricate thoughts.
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https://www.aldilife.com/de/ebook-download/wissenschaft/technik/maschinenbau-und-fertigungstechnik/high-enthalpy-gas-dynamics/p/2015010800263
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math
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High Enthalpy Gas Dynamics
High Enthalpy Gas Dynamics
High-enthalpy flows are those with their specific heats ratio as a function of temperature. The word enthalpy is based on the Greek word enthalpies, which means to put heat into. It comes from the classical Greek prefix en-, meaning to put into, and the verb thalpein, meaning "to heat." The earliest writings to contain the concept of enthalpy did not appear until 1875 when Josiah Willard Gibbs introduced "a heat function for constant pressure" . However, Gibbs did not use the word "enthalpy" in his writings. Instead, the word "enthalpy" first appeared in the scientific literature in a 1909 publication by J. P. Dalton. According to that publication, Heike Kamerlingh Onnes (1853-1926) actually coined the word. Over the years, many different symbols were used to denote enthalpy . It was not until 1922 that Alfred W. Porter proposed the symbol "" as the accepted standard , thus finalizing the terminology still in use today.
Enthalpy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure.
Enthalpy is a thermodynamic potential. It is a state function and an extensive quantity. The unit of measurement for enthalpy in the International System of Units (SI) is the joule, but other historical, conventional units are still in use, such as the British thermal unit and the calorie.
The enthalpy is the preferred expression of system energy changes in many chemical, biological, and physical measurements, because it simplifies certain descriptions of energy transfer. This is because a change in enthalpy takes account of energy transferred to the environment through the expansion of the system under study.
The total enthalpy, , of a system cannot be measured directly. Thus, change in enthalpy, , is a more useful quantity than its absolute value. The change is positive in endothermic reactions and negative in heat-releasing exothermic processes. of a system is equal to the sum of nonmechanical work done on it and the heat supplied to it.
The enthalpy, , of a homogeneous system is defined as
where , , and , respectively, are the internal energy, pressure, and volume of the system.
The enthalpy is an extensive property . This means that for a homogeneous system, the enthalpy is proportional to the size of the system. It is convenient to work with the specific enthalpy , where is the mass of the system, or the molar enthalpy , where is the number of moles ( and are intensive properties ) while working with practical problems. For an inhomogeneous system, the enthalpy is the sum of the enthalpies of the subsystems composing the system.
where the label refers to the various subsystems. In a system with continuously varying , , and/or composition, the summation becomes an integral:
where is the density.
The enthalpy of a homogeneous system can be derived as a characteristic function of the entropy and the pressure as follows.
Let us start from the first law of thermodynamics for a closed system
Here, is a small amount of heat added to the system and is a small amount of work performed by the system. In a homogeneous system, only reversible processes can take place, so the second law of thermodynamics gives
where is the absolute temperature of the system and is the entropy. Furthermore, if only work is done, . For this case, from first law of thermodynamics
Adding to both sides, we have
This can be expressed as
The expression of in terms of entropy and pressure may be unfamiliar to many readers. However, there a
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https://www.enotes.com/homework-help/help-me-these-chemistry-questions-elaborate-how-424605
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math
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Elaborate how the atmosphere could be considered as both a homogenous and heterogeneous mixture.
You are only allowed to ask one question at a time so I edited down accordingly. Since the Earth (and as a result its atmosphere) occupies so much volume, it depends on whether you consider it as a whole or in small parts as to whether it is a homogeneous or heterogeneous mixture. If you consider the atmosphere of the planet as a whole, all of the major gasses (nitrogen, oxygen, and the other trace gasses) are essentially totally mixed up evenly to make a homogeneous mixture. There are no "pockets" of oxygen or any particular gas located anywhere. But on a smaller scale there are concentrated locations of water vapor in the form of clouds. These clouds are clearly visible as a separate phase from the rest of the atmosphere, thus leading to a heterogeneous mixture. So both descriptions could be applicable.
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http://apelix.com/john-nash-thesis.html
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math
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Nash offered john nash thesis interpretations of the con. As john nash thesis thesis advisor, Professor A. The Student Room All information: https://essaypro.com?tap_s=7RtywkQjjYG8dwJGcVNuiM.
Oct 23, 2017. Read John Nashs Super Short PhD Thesis with 26 Pages & 2 Citations: The Beauty of Inventing a Field http://cultr.me/2an2cjL pic.twitter.com/. Nashs thesis, November 1949, we find the results for which he.
Of john nash rose to illustrate. Nash is very clear about this in his 1951 Annals paper:. Feb 24, 2017 - curriculum vitae agente assicurativo minMarvin Minsky talks about John Nash solving other peoples problems.
John Nash Harold William Kuhn, Sylvia Nasar.
When John Nash won the Nobel prize in economics in 1994, many people were surprised to learn that. The thesis contained the definition and properties of what would later be. To John Nash Douglas Bush, A.M., a first-year student in the Graduate.
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He was awarded the Nobel Prize in Economics in 1994. Sep 26, 2016. John nash dissertation - Best HQ writing services provided by top professionals. May 24, 2015. John Nash, the mathematician, who has died aged 86, shared the.
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Nashs short 28-page Ph.D. thesis “Non-Cooperative Games”, published in 1951. We shall return to the thesis later.
Noted mathematician John Nash, Jr. September 1951) as cited in Can and should the Nash program be. John Nash, john harsanyi, and reinhard selten shared the 1994 Nobel Prize in.
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Biography of John F Nash (1928-2015). A paper by Ariel Rubinstein entitled John Nash the master of economic modeling. John Nash Phd Thesis Length >> Cheap essay writing service usa :: Custom essay writing online :: Dissertation writing services legal - Buy college papers. Dr. Nashs solution, contained in a 27-page doctoral thesis he wrote.
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While finishing my dissertation. May 24, 2015. (CNN) John Forbes Nash Jr., the Princeton University mathematician whose life inspired the film A Beautiful Mind, and his wife died in a car. RAND founded. 1950 Nashs PhD Dissertation. May 24, 2015. U.S. mathematician and Nobel Laureate John Nash, 83, stands on the.
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Game theory became a discipline with the work of John von Neumann. May 24, 2015. TRENTON, N.J. (AP) - John Forbes Nash Jr., a mathematical genius whose.
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May 24, 2015. Mathematician John Nash killed in car crash. The reward of inventing a new field is having a slim bibliography. Dec 7, 2016. The story of John Nash, a brilliant mathematician and Nobel prize winner..
Oct 24, 2012. John Nash on Simons Foundation | A video interview, conducted on Nov. May 24, 2015. Nobel Prize -winning mathematician John Nash and his wife, Alicia. For John Nash was stricken with paranoid schizophrenia more than john nash thesis.
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https://sunriser.eu/index.php?site=profile&id=167
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math
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Hello everyone, I'm Jaccy Mice, from New York City, USA. Actually, I have well-known knowledge, great skills, 10+ years of experience, and an easy solution formula for probability. I am a Ph.D.-qualified mathematician from a top United States university. I have been working with Assignmenthelppro around 10 years for probability assignment solutions; it is one of the most popular assignment provider companies in the United States. I am available 24 hours a day to assist students with Online Probability Assignment Help at an affordable cost. Our company covers all topics in mathematics, like algebra, calculus, geometry, trigonometry, etc. So, if you are searching for a highly qualified mathematician, who can solve your assignment easily and on time, contact us now.
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https://hobbydocbox.com/Card_Games/72221020-Mixed-counting-problems.html
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math
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1 We have studied a number of counting principles and techniques since the beginning of the course and when we tackle a counting problem, we may have to use one or a combination of these principles. The counting principles we have studied are: Inclusion-exclusion principle: n(a B) = n(a) + n(b) n(a B). Complement Rule n(a ) = n(u) n(a). Multiplication principle: If I can break a task into r steps, with m1 ways of performing step 1, m2 ways of performing step 2 (no matter what I do in step 1),..., mr ways of performing step r (no matter what I do in the previous steps), then the number of ways I can complete the task is m1 m2 mr. (This also applies if step i of task amounts to selecting from set Ai with mi elements.) Addition principle: If I must choose exactly one activity to complete a task from among the (disjoint) activities A1, A2,..., Ar and I can perform activity 1 in m1 ways, activity 2 in m2 ways,..., activity r in mr ways, then I can complete the task in m1 + m2 + + mr ways. (This also applies if task amounts to selecting one item from r disjoint sets A1, A2,..., Ar with m1, m2,..., mr items respectively.) Permutations: The number of arrangements of n objects taken r at a time is n! P(n, r) = n (n 1) (n r + 1) = (n r)!. Permutations of objects with some alike: The number of different permutations (arrangements), where order matters, of a set of n objects (taken n at a time) where r of the objects are identical is n! r!. Consider a set of n objects which is equal to the disjoint union of k subsets, A1, A2,..., Ak, of objects in which the objects in each subset Ai are identical and the objects in different subsets Ai and Aj, i j are not identical. Let ri denotes the number of objects in set Ai, then the number of different permutations of the n objects (taken n at a time) is n! r1!r2!... rn!. This can also be considered as an application of the technique of overcounting where we count a larger set and then divide. Combinations: The number of ways of choosing a subset of (or a sample of) r objects from a set with n objects, where order does not matter, is C(n, r) = P (n, r) r! n! = r!(n r)!. Note this was also an application of the technique of overcounting.
2 Problem Solving Strategy: You may be able to solve a counting problem with a single principle or a problem may be a multilevel problem requiring repeated application of one or several principles. When asked to count the number of objects in a set, it often helps to think of how you might complete the task of constructing an object in the set. It also helps to keep the technique of overcounting in mind. The following flowchart from your book may help you decide whether to use the multiplication principle, the addition rule, the formula for the number of permutations or the formula for the number of combinations for a problem or a problem part requiring one of these.
4 Example An experiment consists of rolling a 20 sided die three times. The number on top of each die is recorded. The numbers are written down in the order in which they are observed. How many possible ordered triples of numbers can result from the experiment? (Note the triple (17, 10, 3) is not the same result as the triple (3, 10, 17). ) There are 20 ways each throw can come up and the order is important so the answer is = 20 3 = 8000.
5 Example (Hoosier Lottery) When you buy a Powerball ticket, you select 5 different white numbers from among the numbers 1 through 59 (order of selection does not matter), and one red number from among the numbers 1 through 35. How many different Powerball tickets can you buy? If you check out the Powerball web site you will see that you need to select 5 distinct white numbers, so you can do this C(59, 5) = 5, 006, 386 ways. Then you can pick the red number C(35, 1) = 35 ways so the total number of tickets is C(59, 5) P(35, 1) = 5, 006, = 175, 223, 510.
6 Often problems fit the model of pulling marbles from a bag. For example many of our previous problems involving poker hands fit this model. Polling a population to conduct an observational study also fit this model. Example: An bag contains 15 marbles of which 10 are red and 5 are white. 4 marbles are selected from the bag. There s ambiguity here: e.g., if on one draw I select four red marbles, and on another draw I select a different four red marbles, are these considered the same sample or not? We ll assume that they are not the same sample. For example, we could imagine that the marbles are numbered, each with a different number, so that we can tell marbles of the same color apart. This way of thinking will be very useful for calculating probabilities later, when we try to set up an equally likely sample space
7 10 red, 5 white, numbered marbles (a) How many (different) samples (of size 4) are possible? The order does not matter but the numbers do so we are selecting 4 elements from a set of elements. Hence the answer is C(15, 4) = 1, 365. (b) How many samples (of size 4) consist entirely of red marbles? The order does not matter but the numbers do so we are selecting 4 elements from a set of 10 elements. Hence the answer is C(10, 4) = 210.
8 10 red, 5 white, numbered marbles (c) How many samples have 2 red and 2 white marbles? We can select 2 numbered red marbles in C(10, 2) ways and 2 numbered white marbles in C(5, 2) ways. Neither choice affects the other so the answer is C(10, 2) C(5, 2) = = 450. (d) How many samples (of size 4) have exactly 3 red marbles? We can select 3 numbered red marbles in C(10, 3) ways and 1 numbered white marble in C(5, 1) ways. Neither choice affects the other so the answer is C(10, 3) C(5, 1) = = 600.
9 10 red, 5 white, numbered marbles (e) How many samples (of size 4) have at least 3 red? The answer is the number of samples with 3 red plus the number of samples with 4 red. We can select 4 numbered red marbles in C(10, 4) ways and 0 numbered white marbles in C(5, 0) ways. Neither choice affects the other so the answer is C(10, 4) C(5, 0) = = 210. From the last example, there are 600 ways to select samples with exactly 3 red marbles so our answer is = 810.
10 10 red, 5 white, numbered marbles (f) How many samples (of size 4) contain at least one red marble? One answer is the number with exactly 1 + the number with exactly 2... the number with exactly 4. This is C(10, 1) C(5, 3)+C(10, 2) C(5, 2)+C(10, 3) C(5, 1)+C(10, 4) C(5, 0) which is = = 1, 360 It is also the total number of samples (1, 365) minus the number of samples with no red marbles which is C(10, 0) C(5, 4) = 5.
11 Example: Recall that a standard deck of cards has 52 cards. The cards can be classified according to suits or denominations. There are 4 suits, hearts, diamonds, spades and clubs. There are 13 cards in each suit. There are 13 denominations, Aces, Kings, Queens,...,Twos, with 4 cards in each denomination. A poker hand consists of a sample of size 5 drawn from the deck. Poker problems are often like urn problems, with a hitch or two. (a) How many poker hands consist of 2 Aces and 3 Kings? You can pick aces in C(4, 2) ways and kings in C(4, 3) ways. Neither choice affects the other so the answer is C(4, 2) C(4, 3) = 6 4 = 24.
12 There are 13 ways to pick the first denomination. Then are then C(4, 3)ways to pick 3 cards of that denomination. There are 12 ways to pick the second denomination and then C(4, 2) ways to pick 2 cards of that denomination. Hence there are 13 C(4, 3) 12 C(4, 2) = = 3, 744. Mixed Counting Problems (b) How many poker hands consist of 2 Aces, 2 Kings and a card of a different denomination? You can pick the 2 aces, 2 kings in C(4, 2) C(4, 2) = 6 6 = 36 ways. You can pick the remaining card in any of 52 8 = 44 ways so the answer is = 1, 584. (c) How many Poker hands have three cards from one denomination and two from another (a full house)?
13 (d) A royal flush is a hand consisting of an Ace, King, Queen, Jack and Ten, where all cards are from the same suit. How many royal flushes are possible? There is exactly 1 way to pick a royal flush in each suit so there are 4 of them. (e) A flush is a hand consisting of five cards from the same suit. How many different flushes are possible? There are C(13, 5) ways to get all cards of the same suit so there are C(13, 5) C(4, 1) = 1, = 5, 148 flushes.
14 Another useful model to keep in mind is that of repeatedly flipping a coin. This is especially useful for counting the number of outcomes of a given type when the experiment involves several repetitions of an experiment with two outcomes. We will explore probabilities for experiments of this type later when we study the Binomial distribution. We have already used this model in taxi cab geometry. Example: Coin Flipping Model If I flip a coin 20 times, I get a sequence of Heads (H) and tails (T). (a) How many different sequences of heads and tails are possible? There are 2 ways the first flip can come up; 2 more for the second and so on. Hence 2 2 = 2 20 = 1, 048, 576.
15 (b) How may different sequences of heads and tails have exactly five heads? Now we want to keep track of how many heads/tails there are in our sequence. This problem is similar to the taxi cab problem. There are 20 positions which need to be filled with either an 'H' or a 'T'. If we want exactly h heads in the sequence the answer if C(20, h). To see we are on the right track recall 2 n = C(n, 0) + C(n, 1) + C(n, 2) + C(n, 3) + + C(n, n) so the number of sequences with 0 heads plus the number of sequences with 1 head plus... plus the number of sequences with 20 heads is all the sequences so should be 2 20 as in part (a). The actual answer to our problem is C(20, 5) = 15, 504.
16 (c) How many different sequences have at most 2 heads? We did the work in part (b). The answer is C(20, 0) + C(20, 1) + C(20, 2) = = 211 (d) How many different sequences have at least three heads? C(20, 3) + C(20, 4) + + C(20, 19) + C(20, 20). OR 2 20 ( C(20, 0)+C(20, 1)+C(20, 2) ) = 1, 048, = 1, 048, 365
17 Example To make a non-vegetarian fajita at Lopez s Grill, you must choose between a flour or corn tortilla. You must then choose one type of meat from 4 types offered. You can then add any combination of extras (including no extras). The extras offered are fajita vegetables, beans, salsa, guacamole, sour cream, cheese and lettuce. How many different fajitas can you make? Think of this from the point of view of the kitchen. An order comes in and you need to assemble it. First you select the tortilla: 2 choices. Then you add the meat: 4 choices. So far there are 2 4 = 8 possibilities. Now you need to add the extras. There are 7 extras and the order can be any subset of them. Hence your choices are any subset of this set with 7 elements so 2 7 = 128. Hence the total possible is = 1024.
18 Extra Problems Example (a) How many different words (including nonsense words) can you make by rearranging the letters of the word EFFERVESCENCE E 5; F 2; R 1; V 1; S 1; C 2; N 1. Hence there are = 13 letters total and so there are 13! 2! 5! 2! 1! 1! 1! 1! = P(13, 5) 4 = 51, 891, = 12, 972, 960 words.
19 Extra Problems (b) How many different 4 letter words (including nonsense words) can be made from the letters of EFFERVESCENCE, if letters cannot be repeated? There are 7 distinct letters so if repetitions are not permitted the answer is P(7, 4) = 840. (c) How many different 4 letter words (including nonsense words) can be made from the letters of the above word, if letters can be repeated? Answer: 7 4. Do not confuse this with the MUCH harder problem of given 13 tiles with the letters in EFFERVESCENCE, how many 4 letter words can be produced? So for example, you could use F twice but not 3 times.
20 Extra Problems Example The Notre Dame Model UN club has 20 members. Five are seniors, four are juniors, two are sophomores and nine are freshmen. (a) In how many ways can the club select a president, a secretary and a treasurer if every member is eligible for each position and no member can hold two positions? 20 members, 3 officers so P(20, 3). Note you are selecting an ordered subset of 3 distinct elements. (b) In how many ways can the club choose a group of 5 members to attend the next Model UN meeting in Washington. Answer: C(20, 5). This time you need a subset of all the members which has 5 elements but the order isn t important.
21 Extra Problems (c) In how many ways can the club choose a group of 5 members to attend the next Model UN meeting in Washington if all members of the group must be freshmen? Answer: C(9, 5) since you now must select your subset from the set of 9 freshmen.
22 Extra Problems (d) In how many ways can the group of five be chosen if there must be at least one member from each class? There are 5 ways to select a senior, 4 ways to select a junior, 2 ways to select a sophomore and 9 ways to select a freshman. This gives = 360 ways to select a subset with 4 elements containing one member of each class. When you have done this there are 20 4 = 16 members left and you may choose any one of these to round out the group. Hence the answer is = 2, 880. You 2 must divide by 2 because each set of 5 elements selected by this procedure occurs twice.
23 Extra Problems Here is another approach. Because there are 5 members in the subset and 4 classes, exactly one class occurs twice. If there are 2 seniors, these can be selected in C(5, 2) ways and the set filled out with 1 junior, 1 sophomore and 1 freshman, hence in C(5, 2) = 720 ways. If there are 2 juniors, these can be selected in C(4, 2) ways and the set filled out with 1 senior, 1 sophomore and 1 freshman, hence in 5 C(4, 2) 2 9 = 540 ways. If 2 sophomores, 5 4 C(2, 2) 9 = 180. If 2 freshmen, C(9, 2) = 1, 440. Hence the answer is , 440 = 2, 880.
24 Extra Problems Example Harry Potter s closet contains 12 numbered brooms, of which 8 are Comet Two Sixty s (numbered 1-8) and 4 are Nimbus Two Thousand s (Numbered 9-12). Harry, Ron, George and Fred want to sneak out for a game of Quidditch in the middle of the night. They don t want to turn on the light in case Snape catches them. They reach in the closet and pull out a sample of 4 brooms.
25 Extra Problems (a) How many different samples are possible? This is not a well-defined question. Do you want to know how many different sets of brooms you can get or do you want to know how many ways there are if we keep track of which broom Harry gets, which one Ron gets, and so on. In other words, do you want subsets or ordered subsets? For subsets, the answers is C(12, 4) = 495; for ordered subsets the answer is P(12, 4) = 11, 880.
26 Extra Problems (b) How many samples have only Comet Two Sixty s in them? Replace the 12 in the answers for part (a) with 8. (c) How many samples have exactly one Comet Two Sixty in them? The unordered version solution is familiar. There are C(8, 1) = 8 ways to pick the Comet Two Sixty and C(4, 3) = 4 ways to pick the rest so the answer is 8 4 = 32. To do the ordered version, observe that once you have an unordered set of 4 elements, there are 4! = 24 ways to order it. Hence the ordered answer is = 768.
27 Extra Problems (d) How many samples have at least 3 Comet Two Sixty s? Figure out how many samples there are with exactly 3; then figure out how many there are with exactly 4 and then add the two answers. For exactly k Comet Two Sixty s we have C(8, k) C(4, 4 k) unordered subsets and therefore C(8, k) C(4, 4 k) 4! ordered ones.
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https://blender.stackexchange.com/questions/166536/keep-refraction-and-remove-the-background-object
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math
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Hope you're all good,
I have a question, I made an object and use the refraction BSDF on it, so it refract the image I put in the background. And I want to keep the refraction of the object but i want to make transparent the background. If you can help me and know how to do this, please tell me :) I put you the picture i work on. The first picture is with the background. And the second picture is what i want to acvhieve but with the refraction of the first picture.
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http://www.voy.com/92635/473.html
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Date Posted: 04:41:28 03/01/05 Tue
My daughter and I will be visiting Punta Gorda next week. I am hoping to be able to get to a beach and do some detecting while she catches some sun. What permissions do I need to seek, and what beaches are close by?
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https://sentence.yourdictionary.com/constants
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math
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Constants Sentence Examples
Here there are two arbitrary constants, which may be adjusted in various ways.
It is well known that singly, doubly and trebly linked carbon atoms affect the physical properties of substances, such as the refractive index, specific volume, and the heat of combustion; and by determining these constants for many substances, fairly definite values can be assigned to these groupings.
If we express the pressure, volume and temperature as fractions of the critical constants, then, calling these fractions the " reduced " pressure, volume and temperature, and denoting them by 7r, 0 and 0 respectively, the characteristic equation becomes (7+3/0 2)(30-i) =80; which has the same form for all substances.
Obviously, therefore, liquids are comparable when the pressures, volumes and temperatures are equal fractions of the critical constants.
An important connexion between heats of combustion and constitution is found in the investigation of the effect of single, double and triple carbon linkages on the thermochemical constants.Advertisement
The difference of potential between two solutions of a substance at different concentrations can be calculated from the equations used to give the diffusion constants.
Hermite expresses the quintic in a forme-type in which the constants are invariants and the variables linear covariants.
Hesse showed independently that the general ternary cubic can be reduced, by linear transformation, to the form x3+y3+z3+ 6mxyz, a form which involves 9 independent constants, as should be the case; it must, however, be remarked that the counting of constants is not a sure guide to the existence of a conjectured canonical form.
Thus the ternary quartic is not, in general, expressible as a sum of five 4th powers as the counting of constants might have led one to expect, a theorem due to Sylvester.
When the magnetizing current is twice reversed, so as to complete a cycle, the sum of the two deflections, multiplied by a factor depending upon the sectional area of the specimen and upon the constants of the apparatus, gives the hysteresis for a complete cycle in ergs per cubic centimetre.Advertisement
He applied his method with good effect, however, in testing a large number of commercial specimens of iron and steel, the magnetic constants of which are given in a table accompanying his paper.
The field due to a coil can be made as nearly uniform as we please throughout a considerable space; its intensity, when the constants of the coil are known, can be calculated with ease and certainty and may be varied at will'through wide ranges, while the apparatus required is of the simplest character and can be readily constructed to suit special purposes.
In nickel the maximum change of the elastic constants is remarkably large, .amounting to about 15% for Young's modulus and 7% for rigidity; with increasing fields the elastic constants first decrease and then increase.
In a 29% nickel-steel, magnetization increases the constants by a small amount.
Rowland,' whose careful experiments led to general recognition of the fact previously ignored by nearly all investigators, that magnetic susceptibility and permeability are by no means constants (at least in the case of the ferromagnetic metals) but functions of the magnetizing force.Advertisement
The final achievement of Lagrange in this direction was the extension of the method of the variation of arbitrary constants, successfully used by him in the investigation of periodical as well as of secular inequalities, to any system whatever of mutually interacting bodies.'
He also devoted much attention to the pyroelectric phenomena of crystals, which served as the theme of one of the two memoirs he presented for the degree of D.Sc. in 1869, and to the determination of crystallographic constants.
The raw materials are selected with great care to assure chemical purity, but whereas in most glasses the only impurities to be dreaded are those that are either infusible or produce a colouring effect upon the glass, for optical purposes the admixture of other glass-forming bodies than those which are intended to be present must be avoided on account of their effect in modifying the optical constants of the glass.
The simplest method of determining it numerically is, therefore, that adopted by Faraday.4 Table Dielectric Constants (K) of Solids (K for Air = I).
Here is carried out the work of standardizing measuring instruments of various sorts in use by manufacturers, the determination of physical constants and the testing of materials.Advertisement
If suitable values are chosen for these constants, the formula can be made to represent the dispersion of ordinary transparent media within the visible spectrum very well, but when extended to the infra-red region it often departs considerably from the truth, and it fails altogether in cases of anomalous dispersion.
The equations finally arrived at are DX2(A2_ 2) (x2_ A2m)2+g2A2 ' DgA3 (A A l m) 2 +g 2 A2 ' where is the wave-length in free ether of light whose refractive index is n, and A m the wave-length of light of the same period as the electron, is a coefficient of absorption, and D and g are constants.
The form of the limacon depends on the ratio of the two constants; if a be greater than b, the curve lies entirely outside the circle; if a equals b, it is known as a cardioid; if a is less than b, the curve has a node within the circle; the particular case when b= 2a is known as the trisectrix.
The constant a has the same value I 2 for crown and flint glass, so that there are only three disposable constants left.
If within the range5100-3700A, the constants are determined once for all, the formula seems capable of giving by interpolation results accurate to o 2 A, but as a rule the range to which the formula is applied will be much less with a corresponding gain in the accuracy of the results.Advertisement
A homogeneous oscillation is one which for all time is described by a circular function such as sin(nt+ a), t being the time and n and a constants.
The first of the forms which contains three disposable constants did good service in the hands of their authors, but breaks down in important cases when odd powers of s have to be introduced in addition to the even powers.
The second form contains two or three constants according as N is taken to have the same value for all elements or not.
It then possesses four adjustable constants, and more can therefore be expected from it.
As he takes N to be strictly the same for all elements the equation has only three disposable constants A, a and b.
This form has the advantage that the constants of the equation when applied to the spectra of the alkali metals show marked regularities.
If we compare Balmer's formula with the general equation of Ritz, we find that the two can be made to agree if the ordinary hydrogen spectrum is that of the side branch series and the constants a', b, c and d are all put equal to zero.'
If s represents the series of integer numbers the distribution of frequency may be represented by C+Bs2, where C and B are constants.
If we wish to be more general, while still adhering to Deslandres' law as a correct representation of the frequencies when s is small, we may write n - A (s+ 1 1) 2 - - a Po+Pi(s + c) -F +pr(s+ c)r' where s as before represents the integer numbers and the other quantities involved are constants.
A band might in that case fade away towards zero frequencies, and as s increases, return again from infinity with diminishing distances, the head and the tail pointing in the same direction; or with a different value of constants a band might fade away towards infinite frequencies, then return through the whole range of the spectrum to zero frequencies, and once more return with its tail near its head.
But, on the other hand, no one pretends to have found the rigorous expression for the law, and the appropriate approximation may take quite different forms when constants which are large in one case are small in the other.
Omitting correction terms depending on the temperature and on the inductive effect of the earth's magnetism on the moment of the deflecting magnet, if 0 is the angle which the axis of the deflected magnet makes with the meridian when the centre of the deflecting magnet is at a distance r, then zM sin B=I+P+y2 &c., in which P and Q are constants depending on the dimensions and magnetic states of the two magnets.
The value of the constants P and Q can be obtained by making deflexion experiments at three distances.
Attempts have been made to co-ordinate this ionizing power of solvents with their dielectric constants, or with their chemical properties.
The physical constants associated with the name will scarcely be changed, since the proportion of the "companions" is so small.
Main as chief assistant at the Royal Observatory, Greenwich, and at once undertook the fundamental task of improving astronomical constants.
Every time, therefore, that a speculum is repolished, the future quality of the instrument is at stake; its focal length will probably be altered, and thus the value of the constants of the micrometer also have to be redetermined.
It is not possible to deduce a more satisfactory value from the latent heat and the change of density, because these constants are very difficult to determine.
That of Biot is far more complicated and troublesome, but admits greater accuracy of adaptation, as it contains five constants (or six, if 0 is measured from an arbitrary zero).
The omission of the additive arbitrary constants of integration in (8) is equivalent to a special choice of the origin 0 of co-ordinates; viz.
To obtain the complete solution of (II) we must of course superpose the free vibration (6) with its arbitrary constants in order to obtain a complete representation of the most general motion consequent on arbitrary initial conditions.
The resulting Z+R equations are not as a rule easy of application, owing to the fact that the moments and products of inertia A, B, C, F, G, H are not constants but vary in conse- 0 quence of the changing orientation of the body with respect to the co-ordinate axes.
On assuming the directorship of the Nautical Almanac he became very strongly impressed with the diversity existing in the values of the elements and constants of astronomy adopted by different astronomers, and the injurious effect which it exercised on the precision and symmetry of much astronomical work.
A valuable summary of a considerable part of this work, containing an account of the methods adopted, the materials employed, and the resulting values of the various quantities involved, was published in 1895, as a supplement to the American Ephemeris for 1897, entitled The Elements of the Four Inner Planets and the Fundamental Constants of Astronomy.
At the international conference, which met at Paris in 1896 for the purpose of elaborating a common system of constants and fundamental stars to be employed in the various national ephemerides, Newcomb took a leading part, and at its suggestion undertook the task of determining a definite value of the constant of precession, and of 1 Lionville, t.
At the time when Maxwell developed his theory the dielectric constants of only a few transparent insulators were known and these were for the most part measured with steady or unidirectional electromotive force.
Experimental methods were devised for the further exact measurements of the electromagnetic velocity and numerous determinations of the dielectric constants of various solids, liquids and gases, and comparisons of these with the corresponding optical refractive indices were conducted.
He investigated the optical constants of the eye, measured by his invention, the ophthalmometer, the radii of curvature of the crystalline lens for near and far vision, explained the mechanism of accommodation by which the eye can focus within certain limits, discussed the phenomena of colour vision, and gave a luminous account of the movements of the eyeballs so as to secure single vision with two eyes.
If, in the first place, monochromatic aberrations be neglected - in other words, the Gaussian theory be accepted - then every reproduction is determined by the positions of the focal planes, and the magnitude of the focal lengths, or if the focal lengths, as ordinarily happens, be equal, by three constants of reproduction.
If all three constants of reproduction be achromatized, then the Gaussian image for all distances of objects is the same for the two colours, and the system is said to be in " stable achromatism."
If r be the number of quotients in the recurring cycle, we can by writing down the relations connectin g the successive p's and q's obtain a linear relation connecting p nr +m, t'(n-1)r +m, +m in which the coefficients are all constants.
The work falls into two parts, which treat of the asymptotes and singularities of algebraical curves respectively; and extensive use is made of the method of counting constants which plays so large a part in modern geometrical researches.
The points in question have since been called (it is believed first by Dr George Salmon) the circular points at infinity, or they may be called the circular points; these are also frequently spoken of as the points I, J; and we have thus the circle characterized as a conic which passes through the two circular points at infinity; the number of conditions thus imposed upon the conic is = 2, and there remain three arbitrary constants, which is the right number for the circle.
The expression 2 is that of the number of the disposable constants in a curve of the order m with nodes and cusps (in fact that there shall be a node is I condition, a cusp 2 conditions) and the equation (9) thus expresses that the curve and its reciprocal contain each of them the same number of disposable constants.
The determination of the constants in Gauss's theory of terrestrial magnetism occupied him at intervals for over forty years.
In the language of algebra putting m l, m2, m 3, &c. for the masses of the bodies, r1.2 r1.3 r2.3, &c. for their mutual distances apart; vi, v 2, v 3, &c., for the velocities with which they are moving at any moment; these quantities will continually satisfy the equation orbit, appear as arbitrary constants, introduced by the process of integration.
In a case like the present one, where there are two differential equations of the second order, there will be four such constants.
The result of the integration is that the co-ordinates x and y and their derivatives as to the time, which express the position, direction of motion and speed of the planet at any moment, are found as functions of the four constants and of the time.
Putting a, b, c, d, for the constants, the general form of the solution will be x = fl (a,b,c,d,t) y = f2(a,b,c,d,t) From these may be derived by differentiation as to t the velocities dt =f '1(a,b,c,d,t) = x' ?
The arbitrary constants, a, b, c and d, are the elements of the orbit, or any quantities from which these elements can be obtained.
This fact is fully expressed by the equations (4) where we have constants on one side of the equation equal to functions of the variables on the other.
Not less comprehensive has been the work carried out by Professor Newcomb of raising to a higher grade of perfection, and reducing to a uniform standard, all the theories and constants of the solar system.
The determination of the curves of constant retardation depends upon expressing the retardation in terms of the optical constants of the crystal, the angle of incidence and the azimuth of the plane of incidence.
The optical constants (refractive index and co-efficient of extinction) of the metal may then be obtained from observations of the principal incidence and the elliptic polarization then produced.
One method consists in finding directly the elliptic constants of the vibration by means of a quarterwave plate and an analyser; but the more usual plan is to measure the relative retardation of two rectangular components of the stream by a Babinet's compensator.
This is the equation to a parabola, and is equivalent to the empirical formula of Avenarius, with this difference, that in Tait's formula the constants have all a simple and direct interpretation in relation to the theory.
It simplifies the theory, and gives a possible relation between the constants, but it does not appear to remove the complication above referred to, which seems to be inseparable from any conduction theory.
They were constants in a world where humans and their inventions passed through the world, less significant than an exhaled breath.
The class that defines the constants that are used to identify generic SQL types, called JDBC types.
I am using the modification of the Eshelby approach to model for the elastic constants of porous coatings.
Just as physical constants provide " boundary conditions " for the physical universe, mathematical constants somehow characterize the structure of mathematics.
These are TAB format, byte-length specifiers and Hollerith constants.
Curiously, however, the basic properties of these materials (band gap, elastic constants, piezoelectric constants) are not well known.
These differences arise because one or more stability constants has a bad value or indeed should not be present or should not be included.
Quarks Most uses of the resource manager involve defining names, classes, and representation types as string constants.
In biological systems the reference values are often encoded genetically, in the binding constants of proteins for their allosteric effectors.
It is not, generally, possible to use hexadecimal or decimal constants in this fashion.
Consider the language obtained from 1 K = by adding a denumerably infinite stock of new individual constants c 0, c 1, .
The wavelength associated with the vector resultant of these three orthogonal propagation constants is just the free space wavelength lambda.
A public constructor for this class has been purposely omitted and applications should use one of the constants from this class.
The time constants and relative weightings yielded temporal window functions that heavily emphasize information occurring within the very temporal center of the window.
I am analyzing synchrotron X-ray diffraction patterns and to work out the diffractometer constants I refined a silicon pattern.
For the few cases where data are available - data, however, belonging to engines representing standard practice in their construction and in the design of cylinders and steam ports and passages - the law connecting p and v is approximately linear and of the form p=c - bv (28) where b and c are constants.
Kauffmann (Ber., 1906, 39, p. 1 959) attempted an evaluation of the effects of auxochromic groups by means of the magnetic optical constants.
In that case the main branch is found to represent the new series if a' and b 1 are also put equal to zero, so that n l r I I N = 4 - y2' where r takes successively the values 1.5, 2.5, 3.5 A knowledge of the constants now determines the trunk series, which should be n I I N - (I,5)2 The least refrangible of the lines of this series should have a wavelength 4687.88, and a strong line of this wave-length has indeed been found in the spectra of stars which are made up of bright lines, as also in the spectra of some nebulae.
Poisson's application to them in 1809 of Lagrange's theory of the variation of constants; Philippe de Pontecoulant successfully used in 1829, for the prediction of the impending return of Halley's comet, a system of " mechanical quadratures " published by Lagrange in the Berlin Memoirs for 1778; and in his Theorie analytique du systeme du monde (1846) he modified and refined general theories of the lunar and planetary revolutions.
The analysis is extended to a consideration of rate constants for chemical reactions between solutes in solution.
The range column shows the range of specifiable values in the system constants.
Static variables can be used to emulate constants, values that do n't change.
I am analyzing synchrotron x-ray diffraction patterns and to work out the diffractometer constants I refined a silicon pattern.
Only the constants of the excited triplet state may be varied.
Your underhanded attempt to be glib and smarmy does n't undermine or change those historical constants.
While Bob and Jillian have been the constants on the show, there have been other trainers involved as well.
There are notable differences, but some constants.
Silbermann, whose chief theoretical achievement was the recognition that the heat of neutralization of acids and bases was additively composed of two constants, one determined by the acid and the other by the base.
But, at the same time, the constants in the above relation are not identical with those in the corresponding relation empirically deduced from observations on fatty hydrocarbons; and we are therefore led to conclude that a benzene union is considerably more stable than an ethylene union.
Eliminating a and b between these relations, we derive P k V k /Tk= 8R, a relation which should hold between the critical constants of any substance.
By actual observations it has been shown that ether, alcohol, many esters of the normal alcohols and fatty acids, benzene, and its halogen substitution products, have critical constants agreeing with this originally empirical law, due to Sydney Young and Thomas; acetic acid behaves abnormally, pointing to associated molecules at the critical point.
From the relation between the critical constants Pk Vk/Tk = 37 R or T k /P k = 3 .
It contains four independent constants; two of these may be calculated from the heats of combustion of saturated hydrocarbons, and the other two from the combustion of hydrocarbons containing double and triple linkages.
In the article Crystallography the nature and behaviour of twinned crystals receives full treatment; here it is sufficient to say that when the planes and axes of twinning are planes and axes of symmetry, a twin would exhibit higher symmetry (but remain in the same crystal system) than the primary crystal; and, also, if a crystal approximates in its axial constants to 'a higher system, mimetic twinning would increase the approximation, and the crystal would be pseudo-symmetric.
In such crystals each component plays its own part in determining the physical properties; in other words, any physical constant of a mixed crystal can be calculated as additively composed of the constants of the two components.
Let s be the area of a single turn of the standard coil, n the number of its turns, and r the resistance of the circuit of which the coil forms part; and let S, N and R be the corresponding constants for a coil which is to be used in an experiment.
In nickel-steels containing about 50 and 70% of nickel the maximum increase of the constants is as much as 7 or 8%.
The hypothesis that the state was steady, so that interchanges arising from convection and collisions of the molecules produced no aggregate result, enabled him to interpret the new constants involved in this law of distribution, in terms of the temperature and its spacial differential coefficients, and thence to express the components of the kinetic stress at each point in the medium in terms of these quantities.
Further Physical Properties of Sea-water.---The laws of physical chemistry relating to complex dilute solutions apply to seawater, and hence there is a definite relation between the osmotic pressure, freezing-point, vapour tension and boiling-point by which when one of these constants is given the others can be calculated.
Van der Waal's equation (p-I- a/v 2) (v - b) = RT contains two constants a and b determined by each particular substance.
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https://www.watchcrunch.com/Cosme44/posts/is-casio-ga2100-metal-overpriced-20341
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math
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Everyone loves the GA 2100. It's a perfect watch for around 80$ in the non-bluethoot versions. Casio has recently launched a metal version of it, which costs 500$ the least.
I find that massively overpriced taking in account basic ones can be found from 80 to 120$. It seems that I'm the only one who thinks that, as everyone loves it on the internet. I think it's gorgeous to, but not for that price.
What do you think?
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s3://commoncrawl/crawl-data/CC-MAIN-2023-06/segments/1674764499713.50/warc/CC-MAIN-20230129112153-20230129142153-00796.warc.gz
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CC-MAIN-2023-06
| 420 | 3 |
http://stackoverflow.com/questions/7331876/please-tell-me-how-to-open-4d-database
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math
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I trying to open (using 4d v12) the database with the extension .4dc (in addition there are files with extensions .4dd and .4dr).
The result is an error: You cannot convert compiled database. Perhaps this is an old version of the database, but I could not find anything that could convert it to a newer version.
My goal is to obtain information from the database. But the problem is that I'm not good at 4d. And I don't know how to open the .4DC as part of an application.
Please help me if you know how to do it.
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s3://commoncrawl/crawl-data/CC-MAIN-2016-22/segments/1464049281869.96/warc/CC-MAIN-20160524002121-00170-ip-10-185-217-139.ec2.internal.warc.gz
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CC-MAIN-2016-22
| 513 | 4 |
https://www.asciitable.xyz/ascii-text-to-binary-converter/
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math
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ASCII to Binary Converter
Computers can only understand numbers, more specifically 0s and 1s. ASCII text can be converted to decimal number using the ASCII character encoding and the numbers can then be converted to Binary.
The above ASCII text to Binary converter tool can help you convert any ASCII text to Binary. But if you want to understand the process of converting, Here is how it works:
- First step is to find out the decimal number corresponding to each ASCII letter in the input.
- Then, convert the decimal numbers to their binary equivalents to get the final result.
Let’s see some examples of converting ASCII text to Binary
ASCII: Hello Decimal: (72 101 108 108 111) Binary: (1001000 1100101 1101100 1101100 1101111)
ASCII: $PWD! Decimal: (36 80 87 68 33) Binary: (100100 1010000 1010111 1000100 100001)
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s3://commoncrawl/crawl-data/CC-MAIN-2023-50/segments/1700679100527.35/warc/CC-MAIN-20231204083733-20231204113733-00441.warc.gz
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CC-MAIN-2023-50
| 821 | 8 |
https://essaykitchen.net/math-problem/apa/english/slope-intercept-graph-linear-equation-x-y-intercepts.php
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math
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Slope Intercept, Graph Linear Equation and Getting the X and Y Intercepts (Math Problem Sample)
math question and answer on linear algebrasource..
Your cell phone contract has a base charge of $10 per month and a $0.03 per minute charge for nationwide calling.
A. Find five solutions for y= 0.03x + 10 by completing the table of values. (3 points)
xy = 0.03x + 10(x,y)
B. Plot the ordered pairs to graph the above equatio
- Polynomial. Answer polynomial questions with written explanationDescription: x^2 - 15x +54 The general form of this polynomial is ax^2 + bx +c . To factor this polynomial, you need to find two factors that will give the product of ax^2 by c and the sum of the two factors will be equal to bx. In our problem here, the product should be 54x^2 and the sum should be -15x....1 page/≈550 words| No Sources | APA | Literature & Language | Math Problem |
- Algebraic Expression Literature & Language Math ProblemDescription: Multiplying all terms by the L.C.M QUOTE QUOTE – QUOTE QUOTE = 23 QUOTE QUOTE - QUOTE = 23 QUOTE QUOTE +3 QUOTE - QUOTE = 23 QUOTE QUOTE - QUOTE = 23 QUOTE ...1 page/≈275 words| 1 Source | APA | Literature & Language | Math Problem |
- Algebra. Providing a worked out answer on given questionsDescription: We shall use BODMAS rule to solve this equation where we solve the numerator first ((7-6.35) ÷6.5+9.9)) we start we the value in brackets. 0.65/6.5+9.9 then we do division...1 page/≈275 words| No Sources | APA | Literature & Language | Math Problem |
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http://www.solutioninn.com/how-does-the-liquidity-premium-theory-of-the-term-structure
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math
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Question: How does the liquidity premium theory of the term structure
How does the liquidity premium theory of the term structure of interest rates differ from the unbiased expectations theory? In a normal economic environment, that is, an upward-sloping yield curve, what is the relationship of liquidity premiums for successive years into the future? Why?
Relevant QuestionsWhat is the relationship between present values and interest rates as interest rates increase?Suppose we observe the following rates: 1R1 = 10%, 1R2 = 14% and E(2r1) = 10%. If the liquidity premium theory of the term structure of interest rates holds, what is the liquidity premium for year 2?What happens to the fair present value of a bond when the required rate of return on the bond increases?Johnson Motors’s bonds have 10 years remaining to maturity. Interest is paid annually, the bonds have a $ 1,000 par value, and the coupon rate is 8 percent. The bonds have a yield to maturity of 9 percent. What is the ...Calculate the fair present value of the following bonds, all of which have a 10 percent coupon rate (paid semiannually), face value of $ 1,000, and a required rate of return of 8 percent.a. The bond has 10 years remaining to ...
Post your question
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s3://commoncrawl/crawl-data/CC-MAIN-2017-39/segments/1505818689845.76/warc/CC-MAIN-20170924025415-20170924045415-00044.warc.gz
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CC-MAIN-2017-39
| 1,243 | 4 |
https://dalgonashihpoopuppies.com/math-solving-597
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math
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Solve geometry problem
Do you need help with your math homework? Are you struggling to understand concepts how to Solve geometry problem? Our website can help me with math work.
Solving geometry problem
We can do your math homework for you, and we'll make sure that you understand how to Solve geometry problem. If you are solving exponent equations with variables, you will encounter the same problem that you did when you were trying to solve exponent equations with a single variable. This means that you need to find the value of the exponents for each of the variables involved in the equation. Once you have found them, you can then use those values to solve for the unknown variable. When solving this type of equation, there are two main things to keep in mind: First, always make sure that your exponents are positive or zero. You can check this by making sure that all of your values are greater than or equal to 1. If any of them is less than 1, then your equation is not valid and it should be thrown away. Second, be careful when rounding because rounding can change the value of an exponent. If you round too much, then you may end up with an incorrect answer. For example, if you round one tenth to one hundredth, then the value of the exponent will change from 10 to 100. This results in an error in your solution because it is no longer valid. If these things are kept in mind when solving these types of equations, then they become a lot easier to work with.
There are a few steps that you can follow to solve linear inequalities. First, you need to simplify the inequality by removing any extraneous operations. Next, you need to solve for the variable by isolating it on one side of the inequality. Once you have done that, you can then graph the inequality on a number line to find the solution set. Finally, you need to check your work by plugging in a few points from the solution set to make sure that they satisfy the inequality
Solving by factoring is another way to reduce a large number of factors. You can consider each factor as an unknown value and try to find the common factor that will make all the numbers equal. For example, you may have a set of numbers: 3, 4, 6, 7, 11, 12. With these numbers, you can factor the third number into two parts: 3 × 2 = 6 and 3 × 1 = 3. This tells you that when you multiply three numbers together, they will always be equal to six. The process works in a similar way for finding the common denominator in a set of fractions. You can then divide your answers by this common denominator to arrive at your solution.
Differential equations are a type of mathematical equation that can be used to model many real-world situations. In general, they involve the derivative of a function with respect to one or more variables. While differential equations may seem daunting at first, there are a few key techniques that can be used to solve them. One common method is known as separation of variables. This involves breaking up the equation into two parts, one involving only the derivative and the other involving only the variable itself. Once this is done, the two parts can be solved independently and then recombined to find the solution to the original equation. Another popular method is known as integration by substitution. This approach involves substituting a new variable for the original one in such a way that the resulting equation is easier to solve. These are just a few of the many methods that can be used to solve differential equations. With practice, anyone can become proficient in this important mathematical discipline.
Instant support with all types of math
It's a great app, I use it a lot and I really like it but sometimes the way the app calculates the equations might be a bit different from how you learn it at school but the answers are right. I would really recommend this to anyone who's looking for an app to solve equations with explanation included.
Really good and accurate. I recommend it for sure. You can also learn really easily things you don't know/understand since it always shows an explanation. I give these 5 stars because it’s awesome no ads it needs internet but no ads guys this is highly recommend.
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s3://commoncrawl/crawl-data/CC-MAIN-2023-06/segments/1674764500154.33/warc/CC-MAIN-20230204205328-20230204235328-00345.warc.gz
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CC-MAIN-2023-06
| 4,216 | 10 |
https://www.climate-policy-watcher.org/world-oceans/interannualdecadal-variability-sverdrup-function-with-time-delay.html
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math
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For a steady circulation, the meridional volume transport of the wind-driven gyres obeys where we is the Ekman pumping rate, f = 2m sin 0 is the Coriolis parameter, j = df /ad0, a is the radius of the Earth, m is the Earth's angular velocity, 0 is the latitude, X is the longitude, and t0 and tx are the meridional/longitudinal components of wind stress.
Equation (5.389) applies to steady circulations only. As discussed in Section 4.8, when wind stress changes with time, the circulation at a station X adjusts to wind stress changes east of this station with a time delay due to the finite speed of Rossby wave propagation. The
Meridional heat flux
circulation is completely established after all baroclinic Rossby waves reach the western boundary of the basin; however, the arrival of the first baroclinic Rossby waves initiated from the eastern boundary indicates the near completion of the adjustment at each station. Therefore, the corresponding formula is f fAe
M (t) = -- we [A., 0, t - a(ke - A) cos 0/Cg]a cos 0dk (5.391)
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s3://commoncrawl/crawl-data/CC-MAIN-2020-24/segments/1590347400101.39/warc/CC-MAIN-20200528201823-20200528231823-00447.warc.gz
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CC-MAIN-2020-24
| 1,058 | 6 |
http://gmatclub.com/forum/dismal-gmat-score-july-32670.html?fl=similar
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math
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I took my GMAT today and got a dismal 620!
Following is the break up.. Q48 (86%ile) V28(51%ile)
Quant, I thought was going horrible. My weak point in quant was DS - inequalities and it was like the test had known that. Got 5-6 inequalities DS+PS. Quant was definitely an inch above OG 11
and second the opinion that the questions were similar to GMATPrep.
I dont know what happened in Verbal. I thought my Verbal was going well as compared to Quant. All along, my weak point has been critical reasoning. My strongest was SC, but on the test the distinction between the options was minimal and most of them idiomatic. So, I cannot comment on it. I've gone through most of the CR stuff on the forum and could solve it, but in a timed test I get most of them wrong. I can get to the point where I have 2 options but cannot get past that. May be I think too much on the two options and the time left and finally botch it up. However, I could complete the Verbal with just 30 secs left, but had to pay a heavy price for it. I guess I would have been better off spending time on the CR questions and guessing whatever remained at the end.
I need some advice on improving the verbal score. I have gone through KAPLAN
and OG. I found this forum quite late in my prep but I believe that it can still help me redress by problems as I prepare for a retake in early September.
Also, please tell me whether retaking the GMAT will affect my chances of admit adversely. I mean, does the number of times you take the GMAT affect your chances?
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s3://commoncrawl/crawl-data/CC-MAIN-2015-35/segments/1440644065464.19/warc/CC-MAIN-20150827025425-00196-ip-10-171-96-226.ec2.internal.warc.gz
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| 1,526 | 8 |
https://encyclopedia2.thefreedictionary.com/Negative+binomial
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math
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We investigated the effect of various epidemiologic and meteorologic variables on scarlet fever incidence by using hierarchical multivariable negative binomial
regression, accounting for autocorrelation and annual and biannual seasonal trends by using Fourier terms (i.
The negative binomial
regression model is frequently used to model over-dispersed, non-negative count outcomes.
For Mixon, the negative binomial
distribution with q = 2.
As the frequency of unhealthy snacks consumption (outcome variable) is a count variable, with an over-dispersion (without zero inflation), negative binomial
regression model was used for data analysis.
19) Following Lawson's approach, (26) we identified the negative binomial
distribution as the appropriate model function for the data.
To test the predictive value of baseline measures of hedonic response to pleasant images, self-report anhedonia, and future orientation on alcohol, marijuana, and NMPO use at follow-up, we conducted separate negative binomial
regression models for alcohol and marijuana use (Atkins et al.
We then assessed the association of environmental triggers and built environment factors with inhaler use by implementing zero-truncated negative binomial
models, and validating these results using three sensitivity analyses, which we describe in further detail.
We also considered negative binomial
(Linden and Mantyniemi, 2011) and zero-inflated models (Agarwal et al.
For each class of models, we fitted 2 different distributions: the Poisson and the negative binomial
(White and Bennetts, 1996).
x]) (GREEN, 1966), and k parameter of negative binomial
distribution (BLISS and FISHER, 1953; SOUTHWOOD, 1978; ELLIOT, 1979), calculated using the maximum likelihood method.
Thus, the use of a zero-inflated negative binomial
(ZINB) model is more appropriate for analyzing these types of data sets.
The last step in the inferential statistical analysis was the multivariate regression analysis in which, for each outcome variable, a negative binomial
regression model was estimated (Table 6).
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s3://commoncrawl/crawl-data/CC-MAIN-2019-22/segments/1558232257514.68/warc/CC-MAIN-20190524044320-20190524070320-00448.warc.gz
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CC-MAIN-2019-22
| 2,057 | 24 |
https://www.nagwa.com/en/videos/864171060938/
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math
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The two cars are identical. Which statement is true? The first car is heavier than the second. The cars have the same weight. Or the first car is lighter than the second.
The keyword in the question is “identical.” “Identical” means “the same.” So which of the statements is true? Each statement is talking about the weight of the cars. The first statement says that the first car is heavier than the second. The second statement says the cars have the same weight.
We know that the cars are identical, which means they are exactly the same. This means that the cars must have the same weight. So this is the statement which is true. The cars have the same weight. This is because they’re identical.
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s3://commoncrawl/crawl-data/CC-MAIN-2023-14/segments/1679296945317.85/warc/CC-MAIN-20230325064253-20230325094253-00560.warc.gz
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CC-MAIN-2023-14
| 713 | 3 |
https://community.nintex.com/thread/14892-nintex-form-versioning
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math
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I have a list with a customized nintex form. In the menu there is a button with all of the versions. Unfortunately there seems to be no clear assignmenent of created item and used nintex form version at this time....
The problem is, if I change the form later and publish it, also the former created items (with the old nintex forms) use now the new published nintex form.
Is there a way that each list item uses the form version with which it was created before?
Thank you in advance for any help.
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s3://commoncrawl/crawl-data/CC-MAIN-2018-47/segments/1542039742020.26/warc/CC-MAIN-20181114125234-20181114151234-00171.warc.gz
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CC-MAIN-2018-47
| 498 | 4 |
https://en.academic.ru/dic.nsf/enwiki/97552
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math
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- Reactance (electronics)
Reactance is a circuit element's opposition to an alternating current, caused by the build up of electric or magnetic fields in the element due to the current. Both fields act to produce counter emf that is proportional to either the rate of change (time derivative), or accumulation (time integral) of the current. In vector analysis, Reactance is the
imaginary partof electrical impedance, used to compute amplitude and phase changes of sinusoidal alternating currentgoing through the circuit element. It is denoted by the symbol . The SI unit of reactance is the ohm.
Both reactance and resistance are required to calculate the impedance , although in some circuits one of these may dominate: an approximate knowledge of the minor component is useful to determine if it may be neglected.
The magnitude is the ratio of the
voltageand current amplitudes, while the phase is the voltage–current phase difference.
The reciprocal of reactance is
Determining the voltage-current relationship requires knowledge of both the resistance and the reactance. The reactance on its own gives only limited physical information about an electrical component or network.
# A positive reactance implies that the circuit is inductive, where phase of the voltage "leads" the phase of the current; while a negative reactance implies that the circuit is capacitive, where phase of the voltage "lags" the phase of the current
# A reactance of zero implies the current and voltage are in phase and conversely if the reactance is non-zero then there is a phase difference between the voltage and current
There are certain specific effects that depend on the reactance alone, for example; resonance in an series
RLC circuitoccurs when the reactances "XC" and "XL" are equal but opposite, and the impedance has a phase angle of zero.
Capacitive reactance is
inversely proportionalto the signal frequencyand the capacitance .
A capacitor consists of two conductors separated by an insulator, also known as a
At low frequencies a capacitor is
open circuit, as no current flows in the dielectric. A DC voltage applied across a capacitor causes charge to accumulate on one side; the electric fielddue to the accumulated charge is the source of the opposition to the current. When the potentialassociated with the charge exactly balances the applied voltage, the current goes to zero.
Driven by an AC supply, a capacitor will only accumulate a limited amount of charge before the potential difference changes sign and the charge dissipates. The higher the frequency, the less charge will accumulate and the smaller the opposition to the current.
Inductive reactance is
proportionalto the signal frequencyand the inductance .
An inductor consists of a coiled conductor. Faraday's law of electromagnetic induction gives the back emf (voltage opposing current) due to a rate-of-change of
magnetic flux densitythrough a current loop.
For an inductor consisting of a coil with loops this gives.
The back-emf is the source of the opposition to current flow. A constant
direct currenthas a zero rate-of-change, and sees an inductor as a short-circuit(it is typically made from a material with a low resistivity). An alternating currenthas a time-averaged rate-of-change that is proportional to frequency, this causes the increase in inductive reactance with frequency.
The phase of the voltage across a purely reactive device (a device with a resistance of zero) "lags" the current by radians for a capacitive reactance and "leads" the current by radians for an inductive reactance. Note that without knowledge of both the resistance and reactance we cannot determine the voltage--current relationships.
The origin of the different signs for capacitive and inductive reactance is the phase factor in the impedance.
For a reactive component the sinusoidal voltage across the component is in quadrature (a phase difference) with the sinusoidal current through the component. The component alternately absorbs energy from the circuit and then returns energy to the circuit, thus a pure reactance does not dissipate power.
# Pohl R. W. "Elektrizitätslehre." – Berlin-Gottingen-Heidelberg: Springer-Verlag, 1960.
# Popov V. P. "The Principles of Theory of Circuits." – M.: Higher School, 1985, 496 p. (In Russian).
# Küpfmüller K. "Einführung in die theoretische Elektrotechnik," Springer-Verlag, 1959.
* [http://www.magnet.fsu.edu/education/tutorials/java/inductivereactance/index.html Interactive Java Tutorial on Inductive Reactance] National High Magnetic Field Laboratory
* [http://www.geocities.com/SiliconValley/2072/elecrri.htm Resistance, Reactance, and Impedance]
* [http://www.sweethaven.com/sweethaven/ModElec/dcac/SunShine/LessonMain01.asp?uNum=221 Inductive Reactance: Endless Examples & Exercises ]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Reactance (disambiguation) — Reactance may refer to:* Reactivity (chemistry), the rate at which a chemical substance tends to undergo a chemical reaction * Reactance (electronics), a circuit s opposition to alternating current * Reactance (psychology), an emotional reaction… … Wikipedia
reactance — /ree ak teuhns/, n. 1. Elect. the opposition of inductance and capacitance to alternating current, expressed in ohms: equal to the product of the sine of the angular phase difference between current and voltage and the ratio of the effective… … Universalium
List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… … Wikipedia
Radio electronics — * For the magazine, see Radio Electronics Radio electronics is the sub field of electrical engineering concerning itself with the class of electronic circuits which receive or transmit radio signals.Typically such circuits must operate at radio… … Wikipedia
Stub (electronics) — In electronic signaling, a stub is a section of transmission line with a calculated length. It is used for impedance matching or to obtain an exact capacitance or inductance.Because stubs take on reactive properties as a function of their… … Wikipedia
Choke (electronics) — For other uses, see Choke (disambiguation). A choke, with two 47mH windings and rated to handle 0.6A A choke is a coil of insulated wire, often wound on a magnetic core, used as a passive inductor which blocks higher frequency alternating current … Wikipedia
Capacitor — This article is about the electronic component. For the physical phenomenon, see capacitance. For an overview of various kinds of capacitors, see types of capacitor. Capacitor Modern capacitors, by a cm ruler Type Passive … Wikipedia
Inductor — An inductor is a passive electrical component designed to provide inductance in a circuit.Inductors store energy in a magnetic field created when an electric current flows through them. They are usually implemented by some sort of coiled… … Wikipedia
Reactive — can refer to:*Generally, capable of having a reaction *Reactance (electronics), the imaginary component of AC impedance *In behavioral medicine reactive often refers to a treatment approach where a does not initiate contact as opposed to… … Wikipedia
parametric amplifier — Electronics. a device, as an electron tube or transistor, that amplifies a high frequency input signal by sinusoidally varying the reactance of the circuit. [1955 60] * * * … Universalium
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CC-MAIN-2020-50
| 7,573 | 46 |
http://www.transtutors.com/questions/hypothesis-november-28-2012-suppose-you-hear-an-old-timer-say-why-in-my-day-kids-wer-352069.htm
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math
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Suppose you hear an "old-timer" say, "Why, in my day, kids were much more respectful and didn't cause as much trouble as they do nowadays!" Formulate a hypothesis related
Choose a Subject » Select Duration » Schedule a Session
You might want to try the quicker alternative (needs pre-payment)
Yes, take me there No, not that urgent
Fri 16/3 After 48 hours
Please See Attached.
please let me know the cost to complete the 5 assignments. W4A3 tonight, W5A2 by Thursday and the rest by Sunday. Thanks, Debra Durden. My email is [email protected]
the mean/median? Why might you find this information useful? In some data sets, the mean is more important than the median. For example, you want to know your mean...
For each of the following, (a) indicate what two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis, and (d) say whether you should use...
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s3://commoncrawl/crawl-data/CC-MAIN-2014-52/segments/1418802774464.128/warc/CC-MAIN-20141217075254-00001-ip-10-231-17-201.ec2.internal.warc.gz
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CC-MAIN-2014-52
| 1,015 | 11 |
https://library.oapen.org/handle/20.500.12657/43844
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math
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Deterministic Artificial Intelligence
Sands, Timothy (editor)
CollectionKnowledge Unlatched (KU)
Kirchhoff’s laws give a mathematical description of electromechanics. Similarly, translational motion mechanics obey Newton’s laws, while rotational motion mechanics comply with Euler’s moment equations, a set of three nonlinear, coupled differential equations. Nonlinearities complicate the mathematical treatment of the seemingly simple action of rotating, and these complications lead to a robust lineage of research culminating here with a text on the ability to make rigid bodies in rotation become self-aware, and even learn. This book is meant for basic scientifically inclined readers commencing with a first chapter on the basics of stochastic artificial intelligence to bridge readers to very advanced topics of deterministic artificial intelligence, espoused in the book with applications to both electromechanics (e.g. the forced van der Pol equation) and also motion mechanics (i.e. Euler’s moment equations). The reader will learn how to bestow self-awareness and express optimal learning methods for the self-aware object (e.g. robot) that require no tuning and no interaction with humans for autonomous operation. The topics learned from reading this text will prepare students and faculty to investigate interesting problems of mechanics. It is the fondest hope of the editor and authors that readers enjoy the book.
KeywordsComputers; Artificial Intelligence; General
Publication date and place2020
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s3://commoncrawl/crawl-data/CC-MAIN-2024-10/segments/1707947476452.25/warc/CC-MAIN-20240304133241-20240304163241-00402.warc.gz
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CC-MAIN-2024-10
| 1,521 | 6 |
http://www.basic-mathematics.com/basic-math-blog.html
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math
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Oct 17, 17 05:34 PM
Factoring quadratic equations worksheet-get some practice factoring quadratic equations
Oct 16, 17 09:34 AM
What is the conjugate in algebra? A concise and clear explanation.
Oct 15, 17 12:24 PM
Learn to solve tough absolute value equations.
Oct 14, 17 07:03 PM
A list of important academic words students must know in math
Oct 13, 17 04:37 PM
Learn the difference between discrete and continuous data
Oct 12, 17 10:20 AM
Solving literal equations worksheet - Can you solve these literal equations?
Oct 11, 17 10:12 AM
Learn how to solve literal equations with an easy to follow lesson.
Oct 10, 17 09:44 AM
Printable writing equations worksheet that can readily be printed and taken to find out how well you can translate sentence to equations.
Oct 10, 17 09:18 AM
Writing equations worksheet-Practice How to write the equation when a sentence is given
Oct 09, 17 09:29 AM
A printable composition of functions worksheet that can readily be printed and taken to find out how well you can perform composition of functions.
Oct 09, 17 09:25 AM
Learn place value with this worksheet that can readily be printed.
Oct 09, 17 09:23 AM
Simplify radical expressions with this worksheet that can readily be printed.
Oct 09, 17 09:17 AM
Learn the distributive property with this worksheet that can readily be printed.
Oct 09, 17 08:47 AM
Practice with this greatest common factor worksheet that can readily be printed.
Oct 09, 17 08:09 AM
Greatest common factor worksheet- get some practice and understand the GCF
Oct 08, 17 03:24 PM
Place value worksheet- Find out how well you understand place value
Oct 07, 17 04:30 PM
A distributive property worksheet with no variables to help you practice the distributive property
Oct 06, 17 08:58 AM
Simplifying radical expressions worksheet. See how well you can simplify radical expressions
Oct 05, 17 09:45 AM
Find out what a radical expression. An introduction to the concept with an easy to follow lesson
Oct 04, 17 09:51 AM
Learn how to perform addition and subtraction of radicals-easy to follow lessons
Oct 03, 17 11:29 AM
simplifying radicals containing variables is the goal of this lesson
Oct 02, 17 09:14 AM
A composition of functions worksheet with carefully selected exercises
Oct 01, 17 10:12 AM
What is a composite function ? I need an easy explanation
Sep 30, 17 06:52 PM
Learn how to perform operations on functions such as adding, subtracting, multiplying, and dividing functions
Sep 29, 17 11:04 AM
I need help to find the range of a function. Please help!
Sep 28, 17 08:57 AM
What is function notation and why do we use it? I need an easy explanation
Sep 27, 17 09:04 AM
Learn how a vertical line test can be used to determine if a graph is a function
Sep 26, 17 02:30 PM
Learn to quickly identify a function and clearly see the difference between function and relation
Sep 25, 17 09:22 AM
Writing an algebraic expression when a phrase is given is the goal of this lesson
Sep 11, 17 05:06 PM
Easy to follow solution to 100 hard word problems in algebra
Aug 27, 17 09:36 AM
2 m3 of soil containing 35% sand was mixed into 6 m3 of soil containing 15% sand. What is the sand content of the mixture? Let x% be the amount of sand
Jul 28, 17 02:38 PM
Bessy has 6 times as much money as Bob, but when each earn $6. Bessy will have 3 times as much money as Bob. How much does each have before and after
Jul 28, 17 02:32 PM
The population of a town with an initial population of 60,000 grows at a rate of 2.5% per year. What is population in 5 years? In 10 years? How many years
Jul 25, 17 09:06 PM
Learn to solve comparison word problems using modeling
Jul 20, 17 10:41 PM
A water tank is emptied at a constant rate. Initially, 36,000 gallons of water were in the tank. A the end of five hours, 16,000 gallons remained. How
Jul 15, 17 10:45 PM
Jane drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 10 hours. When Jane drove home, there was no traffic
Jul 15, 17 10:25 PM
A stationery store sells a dozen ballpoints pens for $3.84, which represents a 20% discount from the price charged when a dozen pens are bought individually.
Jul 10, 17 10:15 PM
A truck left a depot at noon traveling an average speed of 40 kilometers per hour. How far from the depot and what time will it overtake another truck,
Jul 10, 17 10:36 AM
Problem #1: Peter has 20 dollars in his pocket. He buys a 32 ounces vanilla ice cream for 8 dollars. How much is Peter's change? Solution In this situation,
Jul 10, 17 10:21 AM
A man spends 20% of his income in food, 15% in clothes, 15% in house rent and 30% in miscellaneous. Find his yearly income if he saves Rs 2500 per months.
Jul 10, 17 09:31 AM
A multiple-choice test contains 25 questions. Correct answers are worth 4 points each; 2 points are deducted for each wrong answer; and unanswered questions
Jul 10, 17 09:13 AM
In an apartment building some apartments have a one bedroom and the rest have two bedrooms if there are a total of 50 apartments and 80 bedrooms how many
Jul 10, 17 08:44 AM
The sum of four numbers a, b, c, and d is 68. If we increase a by 7, we get x. If we increased b by 8, we get x. If we decrease c by 15, we get 2x.If we
Jul 03, 17 04:37 PM
Need help with 4th grade math? See the math that is taught in 4th grade
Jun 08, 17 01:52 PM
Learn quickly how to multiply using partial products
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s3://commoncrawl/crawl-data/CC-MAIN-2017-43/segments/1508187822930.13/warc/CC-MAIN-20171018104813-20171018124813-00474.warc.gz
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CC-MAIN-2017-43
| 5,352 | 90 |
https://www.physicsforums.com/threads/rlc-in-an-ac-circuit.423318/
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math
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1. The problem statement, all variables and given/known data For which of the following AC circuits does impedance depend on frequency? A circuit with Check all that apply. a resistor and inductor. a resistor and capacitor. only a resistor. 2. Relevant equations 3. The attempt at a solution I think that for a capacitor and inductor the frequency would change the impedance but im not sure????????? thanks for any help.
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s3://commoncrawl/crawl-data/CC-MAIN-2018-51/segments/1544376828501.85/warc/CC-MAIN-20181217091227-20181217113227-00582.warc.gz
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CC-MAIN-2018-51
| 420 | 1 |
https://web.stagram.com/ashlouise
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math
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I got to meet Bram on his first day ever. 💖Congrats Jet and Lauren! He's so cute!!
You rock too, kid.
Good *Dirty* Hair Day appreciation post. 💁🏼 Learn how to make the most of more days between shampoos. Generally, being able to go at least a day or two between shampoos means a healthier scalp, less heat styling, and spending less time on your hair (my favorite)! My hair gets "dirty" rather quickly and I've found that styling my hair certain ways and using (abusing) a good dry shampoo (like Redken's Pillow Proof Two Day Extender) and an oil through my dry ends (like Redken's Glow Dry Diamond Oil or All Soft Argan6) can always get me one more day. 👌🏼 . . . #salonbluhair#salonblu#raleighhair#raleighhairstylists#blondebalayage#blondehair#redken#redkenready
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s3://commoncrawl/crawl-data/CC-MAIN-2017-09/segments/1487501174154.34/warc/CC-MAIN-20170219104614-00524-ip-10-171-10-108.ec2.internal.warc.gz
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CC-MAIN-2017-09
| 778 | 3 |
http://www.cirrustheduck.com/nfl-trends-part-2/
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math
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Welcome to the second part of the NFL trends series. Here we’ll take a look at how your odds change when betting the total. First lets look at betting the over.
In the above plot, we look at the probability of winning an over bet when the total line is less than a particular amount. Along with this, we have 90% confidence intervals that are based on the sample size at each line (all points have at least 50 samples). As one may expect, betting the over appears to be best when the total line is small. For all cases (total line less than 65), the odds of winning by betting the over is about 48%. Looking at the other side of the graph, a total under 40 points has a 50% or higher chance of going over.
Let’s take a slightly different look at the odds of hitting the under.
An interesting point off the bat is the general odds of winning any under bet. At over 49% when including all cases (total greater than 25 points), the under bet has a higher chance of winning than the over shown before. Looking at high total lines, we have a trend that is near profitable. With a total line greater than 45 points, betting the under gives a historical winning percentage of just over 52%, essentially the break even point. On the edge of the plot at total line greater than 50 points we see a sharp decrease in winning percentage. This is likely due to smaller sample sizes, but I would be a bit weary of unusually large totals. In general, a good betting strategy is betting the under, especially on high totals.
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s3://commoncrawl/crawl-data/CC-MAIN-2018-09/segments/1518891814124.25/warc/CC-MAIN-20180222140814-20180222160814-00567.warc.gz
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CC-MAIN-2018-09
| 1,512 | 4 |
http://www.defensivecarry.com/forum/defensive-rifles-shotgun-discussion/133093-mossberg-590a1-heavy-wall-standard-barrel.html
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math
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I'm looking for a new defensive shotgun and have decided on a Mossberg 590A1. Model numbers 51663 and 51668 have the heavy wall barrels and 50663 and 50668 have the standard barrel. The model numbers ending in 8 have the speed feed stock that hold 4 additional shells, 2 on each side.
Is the speed feed stock better or worse than adding a side saddle shell holder to a standard stock?
Is the heavy wall barrel model worth a few extra bucks?
Let me hear your pros and cons...thanks in advance!
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s3://commoncrawl/crawl-data/CC-MAIN-2013-20/segments/1368699675907/warc/CC-MAIN-20130516102115-00086-ip-10-60-113-184.ec2.internal.warc.gz
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CC-MAIN-2013-20
| 492 | 4 |
https://www.hackmath.net/en/math-problem/35791
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math
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If it is now 7:38 pm, what time will it be in 30,033,996,480 minutes from now?
Thank you for submitting an example text correction or rephasing. We will review the example in a short time and work on the publish it.
Showing 1 comment:
for example 1/8 / 1/8
Tips to related online calculators
You need to know the following knowledge to solve this word math problem:
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Anita had 2 1/4 hours of free time in the afternoon. She spent 2/3 of her free time playing sports and watched TV for 30 minutes. How much time did she have left to read the book? Express the result in fractions in hours and numbers in minutes.
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A clock was set right at 6:00 AM. If it gains 3 1/2 minutes per hour, what time will it show at 6:00 PM on the same day? Show your solution
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What angle shifted little hand on the clock after one hour and 38 minutes?
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What angle is betwenn hands on Clock Tower when show 17 hours and 35 minutes?
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Divide the product of 4 and 5/8 by 1 1/2. Write your answer as a mixed number.
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How many integers are greater than 547/3 and less than 931/4?
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11 hens will eat spilled grain from 6AM to 16 PM. At 11 hour grandmother brought 4 hens from the neighbors. At what time was grain out?
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Tom was asked to guess a fraction. The sum of 1/2 the numerator and 1/3 of its denominator is 30. If Tom subtracts 36 from its denominator, the fraction becomes 1/3. What is the fraction that Tom was asked to guess? (Leave your answer in simplest form)
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s3://commoncrawl/crawl-data/CC-MAIN-2021-10/segments/1614178365454.63/warc/CC-MAIN-20210303042832-20210303072832-00558.warc.gz
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CC-MAIN-2021-10
| 2,900 | 35 |
https://byjus.com/question-answer/what-are-the-last-two-digits-of-7-2008-cat-2008-2161141/
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math
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The correct option is C 1 The last two digits of a number is nothing but the remainder obtained when the number is divided by 100. The number can be rewritten as 2401502. When 2401 is divided by 100, the remainder is 1. So, the last two digits of 72008 will be 1502 = 01.
Using the last 2 digit rule for 7 - Unit digit will be 1 (power cycle of 7). Ten's digit will be - 0×8 = 0. Hence, last two digits will be 01.
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s3://commoncrawl/crawl-data/CC-MAIN-2021-49/segments/1637964358705.61/warc/CC-MAIN-20211129104236-20211129134236-00584.warc.gz
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CC-MAIN-2021-49
| 415 | 2 |
https://quizlrn.com/046-a-math-major/
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math
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Some students who are good with math and enjoy solving math problems do not contemplate specializing in the field since they are uncertain how well a mathematics degree can benefit them.
One common misunderstanding seems that an undergrad degree in math isn’t perceived as job-ready unless you decide to teach math. However, the fact is that there are several fascinating and satisfying careers for degree holders in mathematics, whether in pure maths (theory and abstract), or applied maths (practical applications in diverse fields). We’re going to highlight a few of those careers in a moment; first, let’s discuss what mathematics could do for you irrespective of your career option. And let’s not forget, maths can be paired with subjects like business management, computer science, economics, finance, history, music, philosophy, physics, sports science, statistics, and more.
Even though it is an abstract science, you gain analytical abilities and an analytical mindset by learning mathematics. You start paying attention to all of the factors involved in a specific problem or scenario. You know to simplify down a complex problem into a series of actionable steps. You cultivate analytical analysis practice: checking your results – and others’ assumptions – to make sure that they are based on adequate data and accurate reasoning.
These skills and behaviours are highly regarded by employers and professional and vocational schools (architecture, engineering, business, law, medicine, pharmacy, etc.). An undergrad degree in mathematics, which may take three or four years, particularly if it is followed by a transcript showing good grades in mathematics, is a signal to a prospective employer or an admissions officer that you are capable of understanding the kinds of analytical procedures which are needed in a given job or career, even if those procedures are not directly mathematical.
In the course of undergraduate studies, each student will start developing specific interests and for different sub-fields of math or statistics. Those preferences will ultimately decide the student’s choice of concentration within the major. Another factor of this option is the variety of possibilities that the focus provides for a subsequent career. Even though there is no set list of occupations that follow a major in mathematics or statistics, the most common career paths of graduate students fall into a variety of large categories. Here, in an unordered list, are some of the critical types of careers solely with a degree in math:
• Actuarial sciences
• Data science
• Quantitative finance
• Information and computer technology
• Corporate, management, consulting services
• Teaching at the elementary or secondary level
• Graduate studies in mathematics or statistics, particularly for academic careers
• Graduate training in applied mathematics or statistics
• Graduate study in the interdisciplinary field of mathematical and statistical sciences There is a market for mathematicians and statisticians across various fields —oil and nuclear industry, medicine and health, IT, business consulting and operations research, space science and astronomy, and several engineering and government agencies. There is incredible scope for people with a mathematics background since maths is applied everywhere.
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s3://commoncrawl/crawl-data/CC-MAIN-2021-39/segments/1631780057202.68/warc/CC-MAIN-20210921101319-20210921131319-00107.warc.gz
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CC-MAIN-2021-39
| 3,355 | 14 |
https://docs.cfdhero.com/technical-indicators/ema
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math
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Exponential Moving Average (EMA) is a weighted approach derived from Simple Moving Average (SMA). EMA gives more weight to more recent price data with the core concept that the more recent the data is, the higher value it should have. In contrast, SMA gives equal weight throughout the averages regardless of time relevancy. Using a longer time period for moving averages indicate long term trends, short time frame periods indicates the short term trends.
CFDHero EMA: a buy signal is generated when the short term EMA crosses above the long term EMA, a sell signal is generated when the short term EMA crosses below the long term EMA.
A rising EMA suggests an upward trend and a falling MA indicates a downtrend. EMA Crossing is a crossover signal is created when two different time period EMAs crossover in a chart. A bullish crossover happens when the short-term MA (blue) crosses above a long-term one (red), suggesting the start of an upward trend. In contrast, a bearish crossover happens when a short-term MA crosses below a long-term moving average, which indicates the beginning of a downtrend.
SMA = ( Sum (Price, n) ) / n
EMA = ( P - EMAp ) * K + EMAp
P = Price
EMAp = the Exponential moving Average for the previous period
K = 2 / (n + 1), the smoothing constant
n = Time Period
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s3://commoncrawl/crawl-data/CC-MAIN-2024-18/segments/1712296818072.58/warc/CC-MAIN-20240422020223-20240422050223-00774.warc.gz
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CC-MAIN-2024-18
| 1,291 | 9 |
https://www.studentlance.com/solution/the-american-restaurant-association-collected-information-on-the-number-of-meals
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math
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The American Restaurant Association collected information on the number of meals eaten outside the home per week by young married couples. A survey of 60 couples showed the sample mean number of meals eaten outside the home was 2.76 meals per week, with a standard deviation of 0.75 meals per week. Construct a 97 percent confidence interval for the population mean.
For Required confidence level of 97 %
We have to find the value of Za/2 so first we have to find a
So, a = 1 - 0.97 = 0.03
And Thus a/2 = 0.015
So from the standard table for conversion Z = 2.17
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s3://commoncrawl/crawl-data/CC-MAIN-2019-13/segments/1552912202433.77/warc/CC-MAIN-20190320150106-20190320172106-00549.warc.gz
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CC-MAIN-2019-13
| 561 | 6 |
http://www.algebra.com/algebra/homework/word/age/Age_Word_Problems.faq.question.253659.html
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math
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You can put this solution on YOUR website!
math's youth lasted 1/6 of his life
he had first beard in the next 1/12th of his life
at the end of the following 1/7th of his life, math got married
5 years from then his son was born
his son live exactly half of maths life
math died four years after the death of his son
how long did math live?
Suppose he lived to be N years old.
From his birth until the end of his youth was N/6 years
From the end of his youth until he grew his first beard was N/12 years.
From the time he shaved off his first beard till he got married was N/7 years.
From the time he got married until his son was born was 5 years.
From the time his son was born until his son died was N/2 years
From the time his son died until he died was 4 years.
All that adds up to N
Multiply through by the LCD = 84
He lived 84 years.
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s3://commoncrawl/crawl-data/CC-MAIN-2013-20/segments/1368704368465/warc/CC-MAIN-20130516113928-00013-ip-10-60-113-184.ec2.internal.warc.gz
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CC-MAIN-2013-20
| 839 | 18 |
https://dhammawheel.com/viewtopic.php?f=12&t=3563&p=53294
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math
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Once I was sitting outside an ice cream shop and the conversation at our table died. Somehow that evolved into a group determination to empirically evaluate pi with the materials at hand. Well the materials at hand were exceptionally well suited to the task. I had a tape measure in my pocket, we had leftover chalk from making a sundial (well a sun clock of sorts) on the wall, and a bicycle.
I chalked the tire, ran it along the sidewalk, and measured the distance between the two resulting marks. Then I measured the diameter of the tire. Only then did I pull a calculator out of my pocket and take the ratio. To my amazement, the result was 3.142, rounded. I was expecting something between 3 and 3.3 but geez Louise. What is the probability this occurred by chance?
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s3://commoncrawl/crawl-data/CC-MAIN-2017-39/segments/1505818687906.71/warc/CC-MAIN-20170921205832-20170921225832-00482.warc.gz
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CC-MAIN-2017-39
| 770 | 2 |
https://goprep.co/ex-12.2-q21-draw-two-concentric-circles-with-centre-o-and-i-1nl1xy
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math
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Step1: Draw a circle of radius 2 cm with centre O by taking 2 cm in compass. This is the inner circle
Step2: Now take 4 cm in compass keep the needle on point O and draw a circle. This is the outer circle. Take any point P on the outer circle
Now we have to draw a tangent from point P to the inner circle. This is the same as drawing tangents to circle from an external point.
Step4: Join OP and using scale mark the midpoint of OP which will lie on the inner circle
Step5: Take the distance MO in compass keep the needle on point M and mark arcs cutting the inner circle at point Q and T as shown
Step6: Construct a line passing through PQ and PT which are the required tangents
Rate this question :
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s3://commoncrawl/crawl-data/CC-MAIN-2021-10/segments/1614178351134.11/warc/CC-MAIN-20210225124124-20210225154124-00054.warc.gz
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CC-MAIN-2021-10
| 701 | 7 |
https://aiep.pl/volumes/1980/7_2/txt/txt_03.php
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math
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Szypuła J., 1987. Comparison of accuracy of binomial, von Bertalanffy equation, Gompertz equation and Ford-Walford model used for mathematic description of length growth in various fish species. Acta Ichthyol. Piscat. 17 (2): 33-47.
The paper presents results of studies comparing empirical lengths of 50 fish species with lengths calculated by means of 4 most common mathematic growth models (binomial, von Bertalanffy equation, Gompertz equation and Ford-Walford model). From 5 to 19 versions of each model were calculated for every species, both for the whole range of empirical data and for its initial or terminal part. A total of 1920 mathematic length growth models were calculated, and mean difference between empirical and calculated results was computed for each model. The binomial was found to yield the best results (smallest mean differences), the worst results being obtained with the Ford-Walford model.
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s3://commoncrawl/crawl-data/CC-MAIN-2021-49/segments/1637964361253.38/warc/CC-MAIN-20211202084644-20211202114644-00177.warc.gz
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CC-MAIN-2021-49
| 920 | 2 |
https://mathmatik.com/quadratic-equations.html
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math
|
Solving by Factoring
A quadratic equation is an equation that can be written in the form
ax2 + bx + c = 0
where a, b, and c are real numbers with a ≠ 0.
To solve a quadratic equation by factoring, rewrite the
equation, if necessary, so that one
side is equal to 0 and use the Zero-Product Property:
ab = 0 if and only if a = 0 or b = 0.
Example 1: Solve the following equations by factoring.
Example 2: Solve 9x2 −16 = 0 using the square root method.
Solving by Completing the Square
Given x2 + bx + c = 0
1. Rewrite the equation as x2 + bx = −c (Notice that the
leading coefficient is positive 1,
if it’s not then you will have to divide both sides of the equation by the leading
coefficient.) and make the left –hand side a perfect square.
2. Make the left-hand side a perfect square by adding
both sides (to balance the
3. Factor the left-hand side.
4. Use the square root property to solve.
Example 3: Find all real solutions of the following
equations by completing the square.
Solving by the Quadratic Formula
The solutions of the equation ax2 + bx + c = 0 , where a
≠ 0 , can be found by using the
Example 4: Find all real solutions of 3x2 + 2x + 2 = 0 by using the quadratic formula.
Note: The discriminant of the equation ax2 + bx + c = 0 ( a ≠ 0) is given by
D = b2 − 4ac .
If D > 0, then the equation ax2 + bx + c = 0 has two
distinct real solutions.
If D = 0, then the equation ax2 + bx + c = 0 has exactly one real solution.
If D < 0, then the equation ax2 + bx + c = 0 has no real solution (The roots of the
equation are complex numbers and appear as complex conjugate pairs.)
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s3://commoncrawl/crawl-data/CC-MAIN-2022-21/segments/1652662558015.52/warc/CC-MAIN-20220523101705-20220523131705-00121.warc.gz
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CC-MAIN-2022-21
| 1,606 | 33 |
https://money.stackexchange.com/questions/20433/how-to-determine-mutual-fund-or-etf-capital-gains-taxes-in-canada
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math
|
In Canada, calculating the capital gain from selling a partial position is done based on average cost, as opposed to using First-In-First-Out (FIFO) or other rules distinguishing units based on date acquired. (e.g. Canada doesn't contrast "short-term" vs. "long-term" gains like the U.S. does.)
New units and old units in your non-registered accounts are all considered part of the same position when it comes to figuring the capital gains. The cost per unit you need to calculate to determine your capital gain is known officially as the Adjusted Cost Base, or ACB.
From a simplistic perspective – i.e. where no distributions were received – the ACB per unit is the average price paid (including commissions paid to acquire the shares or units.) From this perspective, and probably incorrect for a mutual fund, your ACB would be:
((100 * $10) + (200 * $5) + (50 * $20) + (100 * $10)) / 450 = ($4000 / 450) ~= $8.8889 per unit
For typical company shares paying typical dividends, the ACB calculation would likely end there, as dividends are not a factor in the gain calculation – unless you are reinvesting your dividends.
The ACB calculation is more complicated for mutual funds, exchange-traded funds, closed-end-funds, and income trusts, due to the kinds of distributions made by such investment vehicles. Distributions are frequently composed of more than just dividends.
Fund distributions often contain components like return of capital (ROC) and distributed capital gains, i.e. when the fund itself realizes net gains on transactions in the portfolio and passes them through to you. Return-of-capital distributions reduce your ACB. Capital gain distributions increase your ACB. You don't want to be taxed twice on distributed gains, so be sure to figure your ACB correctly.
You can know if your fund issued those specific kinds of distributions by looking at the tax slips received, checking with the fund company (e.g. their web site), or your broker/advisor.
So, imagine if, in your example, you had also received $600 worth of distributions, identified as $80 dividends, $20 "other" income (e.g. interest), $450 return-of-capital, and $50 capital gains. Then, your ACB per unit would then be:
($4000 - $450 + $50) / 450 = $8.00 per unit
And so if you sold 300 units at $10 each, the net gain on the sale would be:
300 * ($10 - $8) = $600
(And your $80 dividends and $20 "other" income would be taxed separately on your return, at their respective tax rates.)
I hope this helps. Here are some additional resources to check out:
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s3://commoncrawl/crawl-data/CC-MAIN-2023-40/segments/1695233511002.91/warc/CC-MAIN-20231002164819-20231002194819-00164.warc.gz
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CC-MAIN-2023-40
| 2,542 | 14 |
http://mathforum.org/kb/thread.jspa?threadID=2391858&messageID=7854259
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math
|
Let f(x) be a nonconstant, linear function on the interval [a,b] where a < b. Then one of f(a) and f(b) will be the unique local and absolute maximum and one will be the unique local and absolute minimum (if your definition of local extremum allows for a one-sided extremum). Note that every point between a and b qualifies as one of the c's whose existence is guaranteed by the MVT. If we now consider the constant function on [a,b], then every point between a and b qualifies as all of the following: one of the c's as well as a local max, a local min, an absolute max, a local min, and an absolute min.
-- Professor Jeff Stuart, Chair Department of Mathematics Pacific Lutheran University Tacoma, WA 98447 USA (253) 535 - 7403 [email protected]
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s3://commoncrawl/crawl-data/CC-MAIN-2018-17/segments/1524125937074.8/warc/CC-MAIN-20180419223925-20180420003925-00167.warc.gz
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CC-MAIN-2018-17
| 747 | 2 |
https://iris.unicampania.it/handle/11591/322378
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math
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We present a technique for building effective and low cost preconditioners for sequences of shifted linear systems $(A + alpha I) x_alpha = b$, where A is symmetric positive definite and $alpha > 0$. This technique updates a preconditioner for A, available in the form of an $LDL^T$ factorization, by modifying only the nonzero entries of the L factor in such a way that the resulting preconditioner mimics the diagonal of the shifted matrix and reproduces its overall behavior. This approach is supported by a theoretical analysis as well as by numerical experiments, showing that it works efficiently for a broad range of values of $alpha$.
File in questo prodotto:
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s3://commoncrawl/crawl-data/CC-MAIN-2024-10/segments/1707947473735.7/warc/CC-MAIN-20240222061937-20240222091937-00109.warc.gz
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CC-MAIN-2024-10
| 713 | 3 |
http://growing-fruit.blogspot.com/2010/07/my-name-is-amy.html
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math
|
And I am a math curriculum addict.
I am sitting here recalling how we started with Saxon (a bust) and moved to RightStart for a year and a half. Then we got stuck. Instead of just taking a breather I panicked and bought curriculum and kept trying...
Yes...I own them all. K-4.
And now I am trying to breathe. Breathe in...Breathe out.. repeat.
I need an intervention. Going to bust out RightStart and begin where we left off in B and then order C. Now where did I stash the manipulatives?
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s3://commoncrawl/crawl-data/CC-MAIN-2018-30/segments/1531676590866.65/warc/CC-MAIN-20180719105750-20180719125750-00297.warc.gz
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CC-MAIN-2018-30
| 488 | 5 |
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