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The Bernstein-von Mises theorem for non-regular generalised linear inverse problems
|
We consider a broad class of nonlinear statistical inverse problems from a Bayesian perspective. This provides a flexible and interpretable framework for their analysis, but it is important to understand the relationship between the chosen Bayesian model and the resulting solution, especially in the ill-posed case where in the absence of prior information the solution is not unique. Following earlier work about consistency of the posterior distribution of the reconstruction, we obtain approximations to the posterior distribution in the form of a Bernstein–von Mises theorem for nonregular Bayesian models. Emission tomography is taken as a canonical example for study, but our results hold for a wider class of generalised linear models with constraints.
|
Let X and Y be two inflnite dimensional real or complex Banach spaces. In this note we determine the forms of surjective additive maps ` : L(X) ! L(Y ) preserving the kernel's dimension or the range's codimension. As consequence, we establish that ` : L(X) ! L(X) preserves the kernel (respectively, the range) if and only if there exists an invertible operator A 2 L(X) such that `(T) = AT (respectively, `(T) = TA) for all T 2 L(X).
|
eng_Latn
| 132,164 |
Noise Prevents Singularities in Linear Transport Equations
|
A stochastic linear transport equation with multiplicative noise is considered and the question of no-blow-up is investigated. The drift is assumed only integrable to a certain power. Opposite to the deterministic case where smooth initial conditions may develop discontinuities, we prove that a certain Sobolev degree of regularity is maintained, which implies H\"older continuity of solutions. The proof is based on a careful analysis of the associated stochastic flow of characteristics.
|
We study a new technique for optimal data compression subject to conditions of causality and different types of memory. The technique is based on the assumption that some information about compressed data can be obtained from a solution of the associated problem without constraints of causality and memory. This allows us to consider two separate problem related to compression and de- compression subject to those constraints. Their solutions are given and the analysis of the associated errors is provided. Keywords—stochastic signals, optimization problems in signal processing.
|
eng_Latn
| 132,166 |
On the zeros of Bloch functions
|
A function f, analytic in the unit disc , is said to be a Bloch function if sup z2 (1j zj 2 )jf 0 (z)j <1. In this paper we study the zero sequences of non-trivial Bloch functions. Among other results we prove that if f is a Bloch function with f(0) 0 andfzkg is the sequence of ordered zeros of f; then N Y
|
We deal with linear parabolic (in the sense ::: of Petrovskii) systems of order $2b$ with discontinuous principal ::: coefficients. A priori estimates in Sobolev and ::: Sobolev--Morrey spaces are proved for the strong solutions by ::: means of potential analysis and boundedness of certain singular ::: integral operators with kernels of mixed homogeneity. As a ::: byproduct, precise characterization of the Morrey, $BMO$ and ::: Holder regularity is given for the solutions and their ::: derivatives up to order $2b-1.$
|
eng_Latn
| 132,175 |
The decomposition of global conformal invariants VI: The proof of the proposition on local Riemannian invariants
|
This is the last in a series of papers where we prove a conjecture of Deser and Schwimmer regarding the algebraic structure of ``global conformal invariants''; these are defined to be conformally invariant integrals of geometric scalars. The conjecture asserts that the integrand of any such integral can be expressed as a linear combination of a local conformal invariant, a divergence and of the Chern-Gauss-Bonnet integrand. The present paper, jointly with [6,7] gives a proof of an algebraic Proposition regarding local Riemannian invariants, which lies at the heart of our resolution of the Deser-Schwimmer conjecture. This algebraic Propositon may be of independent interest, applicable to related problems.
|
The Fredholm property of operator, essentially unitary and essentially normal composition are important. Which Fredholm operator are reversible operator is the key problem. The main purpose of this paper is to study Fredholm, essentially unitary and essentially normal composition operators on L~2(u) when the underlying measure space (X,φ,u) is non-atomic. The existence condition of Fredholm operator is discussed.
|
eng_Latn
| 132,176 |
Hunt's Hypothesis (H) for the Sum of Two Independent Levy Processes
|
Which Levy processes satisfy Hunt’s hypothesis (H) is a long-standing open problem in probabilistic potential theory. The study of this problem for one-dimensional Levy processes suggests us to consider (H) from the point of view of the sum of Levy processes. In this paper, we present theorems and examples on the validity of (H) for the sum of two independent Levy processes. We also give a novel condition on the Levy measure which implies (H) for a large class of one-dimensional Levy processes.
|
Previously developed ``stochastic representation of deterministic interactions`` enables exact treatment of an open system without leaving its native phase space (Hilbert space) due to peculiar stochastic extension of the Liouville (von Neumann) equation for its statistical operator. Can one reformulate the theory in terms of stochastic ``Langevin equations'' for its variables? Here it is shown that in case of classical Hamiltonian underlying dynamics the answer is principally positive, and general explicit method of constructing such equations is described.
|
eng_Latn
| 132,177 |
An analytical study of the p/n junction space‐charge region under high forward voltage
|
The behavior of the p/n junction space‐charge region under high forward voltage is studied quantitatively and qualitatively by linearizing the Poisson equation. As examples, the symmetric step and linearly graded junction as special cases of a symmetric exponential doping profile are investigated. From the analytical solutions and their interpretation we obtain a detailed physical insight about the behavior of the space‐charge region capacitance and positions of the space‐charge region edges.
|
In this paper, we obtain the equivalent relations between Kolmogorov maximal inequality and Hajek–Renyi maximal inequality both in moment and capacity types in sublinear expectation spaces. Based on these, we establish several strong laws of large numbers for general random variables and obtain the growth rate of the partial sums. In a first application, a strong law of large numbers for negatively dependent random variables is obtained. In a second application, we consider the normalizing sequence \(\{\log n\} _{n\ge 1}\) and get some special limit properties in sublinear expectation spaces.
|
eng_Latn
| 132,193 |
Hyers–Ulam Stability of Differential Operators on Reproducing Kernel Function Spaces
|
In this paper, we investigate the Hyers–Ulam stability of the differential operators \(T_\lambda \) and D on the weighted Hardy spaces \(H_\beta ^2\) with the reproducing property. We obtain a necessary and sufficient condition in order that D is stable on \(H_\beta ^2\), and construct an example concerning the stability of \(T_\lambda \) on \(H_\beta ^2\). Moreover, we also investigate the Hyers–Ulam stability of the partial differential operators \(D_i\) on the several variables reproducing kernel space \(H_f^2(\mathbb {B}_d)\).
|
We present what is to our knowledge the most complete 1-D numerical analysis of the evolution and the propagation ::: dynamics of an ultrashort laser pulse in a Ti:Sapphire laser oscillator. This study confirms the dispersion ::: managed model of mode-locking, and emphasizes the role of the Kerr nonlinearity in generating mode-locked ::: spectra with a smooth and well-behaved spectral phase. A very good agreement with experimental measurements ::: of pulse energy, spectrum, and temporal width of extracavity compressed pulses is found.
|
eng_Latn
| 132,194 |
IMPROVEMENT ON OPERATOR AXIOMS AND FUNDAMENTAL OPERATOR FUNCTIONS
|
The Operator axioms have been contructed to deduce number systems. In this paper, we slightly improve on the syntax of the Operator axioms and construct a semantics of the Operator axioms. Then on the basis of the improved Operator axioms, we define two fundamental operator functions to study the analytic properties of the Operator axioms. Finally, we prove two theorems about the fundamental operator functions and pose some conjectures. Real operators can give new equations and inequalities so as to precisely describe the relation of mathematical objects or scientific objects.
|
For a large class of vanilla contingent claims, we establish an explicit F\"ollmer-Schweizer decomposition when the underlying is a process with independent increments (PII) and an exponential of a PII process. This allows to provide an efficient algorithm for solving the mean variance hedging problem. Applications to models derived from the electricity market are performed.
|
yue_Hant
| 132,195 |
Fredholm Composition Operators on Non-atomic Measure Space
|
The Fredholm property of operator, essentially unitary and essentially normal composition are important. Which Fredholm operator are reversible operator is the key problem. The main purpose of this paper is to study Fredholm, essentially unitary and essentially normal composition operators on L~2(u) when the underlying measure space (X,φ,u) is non-atomic. The existence condition of Fredholm operator is discussed.
|
In this paper, we obtain a $\alpha$-Suzuki fixed point theorem by using $C$ - class function on quasi metric spaces. Also we give an example which supports our main theorem.
|
eng_Latn
| 132,205 |
DISCRETE-TIME MARTINGALES WITH SPATIAL PARAMETERS
|
Our analysis of a certain stochastic difference equation driven by a martingale k↦M(x,k) that depends on a spatial parameter x∈R d requires some regularity properties of the underlying martingale be satisfied. Because of their independent interest, we present these regularity properties in this article. We study first the continuity and Lipschitz continuity properties under corresponding conditions on the quadratic covariation of the martingale. We follow this with differentiability and integrability properties. Our analysis of the stochastic difference equation requires a discrete-time version of Ito's formula. The discrete-time Ito formula we have derived involves a martingale transform term. The purpose of the final section is to introduce linear and nonlinear martingale transforms and analyze their properties.
|
Abstract We present a convenient analytical parametrization, in both configuration and momentum spaces, of the deuteron wave-function calculated with the Paris potential.
|
yue_Hant
| 132,206 |
Learning high-dimensional functions on the torus
|
In this paper we study the multivariate ANOVA decomposition for $1$-periodic functions on the torus. In particular we use the integral projection operator that leads to the classical ANOVA decomposition. Relationships between the Fourier coefficients of the function and its ANOVA terms lead to special frequency index sets and give an understanding of the decomposition working in the frequency domain. Moreover, we consider the truncated ANOVA decomposition and provide error bounds for approximation in $\mathrm{L}_\infty$ and $\mathrm{L}_2$. We present an approximation method based on the truncated decomposition with regard to a superposition dimension $d_s$.
|
In this article we exhibit some balls lying in the quasi-Fuchsian space of once punctured tori, which are maximal in the class of balls with the same centers. The centers of our maximal balls lie on the slice determined by the trace equation y = ¯ x.
|
eng_Latn
| 132,209 |
On discrete integrable equations with convex variational principles
|
We investigate the variational structure of discrete Laplace-type equations that are motivated by discrete integrable quad-equations. In particular, we explain why the reality conditions we consider should be all that are reasonable, and we derive sufficient conditions (that are often necessary) on the labeling of the edges under which the corresponding generalized discrete action functional is convex. Convexity is an essential tool to discuss existence and uniqueness of solutions to Dirichlet boundary value problems. Furthermore, we study which combinatorial data allow convex action functionals of discrete Laplace-type equations that are actually induced by discrete integrable quad-equations, and we present how the equations and functionals corresponding to (Q3) are related to circle patterns.
|
In this paper we examine evolution inclusions of the subdifferential type with the set-valued perturbation being nonconvex valued and dissipative. Under certain generally mild hypotheses on the data, we prove the existence of a strong global solution, extending earlier analogous results by M. Otani and A. Cellina-V. Staicu. An example of a distributed parameter system is also presented in detail.
|
eng_Latn
| 132,220 |
Existence and Uniqueness for Stochastic Dynamic Equations
|
The theory of stochastic dynamic equations extends and unifies the theories of stochastic difference and differential equations. In this paper, we prove the existence and uniqueness of the strong solution of a certain class of stochastic dynamic equations. As a principal tool in the proof, we define and develop the properties of stochastic dynamic integrals with respect to a Brownian motion indexed by a time scale. Finally we illustrate our theory with the examples of stochastic exponential and geometric Brownian motion.
|
We describe preliminary results from an effort to quantify the uncertainties in parton distribution functions and the resulting uncertainties in predicted physical quantities. The production cross section of the $W$ boson is given as a first example. Constraints due to the full data sets of the CTEQ global analysis are used in this study. Two complementary approaches, based on the Hessian and the Lagrange multiplier method respectively, are outlined. We discuss issues on obtaining meaningful uncertainty estimates that include the effect of correlated experimental systematic uncertainties and illustrate them with detailed calculations using one set of precision DIS data.
|
eng_Latn
| 132,225 |
On certain spaces of double sequences by de la Vallée-Poussin mean
|
In this paper, we introduce some λ2-convergence spaces of double difference sequences of interval numbers with Musielak–Orlicz function ℳ = (Mkl) over n-normed spaces. We also make an effort to study some topological properties and inclusion relations between these spaces. Furthermore, we study λ2-statistical convergence of double difference sequences of interval numbers.
|
Let X,X1,X2,... be i.i.d. random variables, and set Sn=X1+...+Xn. We prove that for three important distributions of X, namely normal, exponential and geometric, series of the type [summation operator]n>=1anP(Sn>=xbn) or [summation operator]n>=1anP(Sn>=xbn) behave like their first term as x-->[infinity].
|
eng_Latn
| 132,229 |
A new characterization of almost bent functions
|
We study the functions from F2m into F2m for odd m which oppose an optimal resistance to linear cryptanalysis. These functions are called almost bent. It is known that almost bent functions are also almost perfect nonlinear, i.e. they also ensure an optimal resistance to differential cryptanalysis but the converse is not true. We here give a necessary and sufficient condition for an almost perfect nonlinear function to be almost bent. This notably enables us to exhibit some infinite families of power functions which are not almost bent.
|
We present the Penrose limits of a complex marginal deformation of $AdS_5\times S^5$, which incorporates the $SL(2,\mathbb{R})$ symmetry of type IIB theory, along the $(J,0,0)$ geodesic and along the $(J,J,J)$ geodesic. We discuss giant gravitons on the deformed $(J,0,0)$ pp-wave background.
|
eng_Latn
| 132,340 |
The paper contains a detailed exposition of the construction and properties of the Kontsevich integral invariant, crucial in the study of Vassiliev knot invariants.
|
Motive par la theorie des champs conforme en dimension deux avec la symetrie de jauge, on etudie la monodromie des connexions integrables associees aux algebres de Lie simples. Ceci donne une serie de representations lineaires du groupe de tresses dont la forme explicite est exprimee par des solutions de l'equation de Yang-Baxter
|
This paper has been withdrawn by the author due to a crucial mistakes.
|
eng_Latn
| 132,372 |
We consider Gaussian ensembles of m complex N × N matrices. We identify an enhanced symmetry in the system and the resultant closed subsector, which is naturally associated with the radial sector of the theory. The density of radial eigenvalues is obtained in the large N limit. It is of the Wigner form only for m = 1. For m ⩾ 2, a new form of the density is obtained.
|
By performing explicit computations of correlation functions, we find evidence that there is a sector of the two matrix model defined by the $SU(2)$ sector of ${\cal N}=4$ super Yang-Mills theory, that can be reduced to eigenvalue dynamics. There is an interesting generalization of the usual Van der Monde determinant that plays a role. The observables we study are the BPS operators of the $SU(2)$ sector and include traces of products of both matrices, which are genuine multi matrix observables. These operators are associated to supergravity solutions of string theory.
|
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
|
eng_Latn
| 132,391 |
A class of finite-action, self-dual SU(2) gauge fields are constructed for the Eguchi-Hanson metric. Two continuous parameters appear in the solution leading to a continuous action. This class includes the spin-connection solution as a particular case and reduces to the Belavin-Polyakov-Schwarz-Tyupkin instanton after a suitable passage to the flat-space limit. Possible significances of such solutions are discussed.
|
In this work we study the dimensional reduction of smooth circle invariant Yang-Mills instantons defined on 4-manifolds which asymptotically become circle fibrations over hyperbolic 3-space. A suitable choice of the 4-manifold metric within a specific conformal class gives rise to singular and smooth hyperbolic monopoles. A large class of monopoles is obtained if the conformal factor satisfies the Helmholtz equation on hyperbolic 3-space. We describe simple configurations and relate our results to the Jackiw-Nohl-Rebbi construction, for which we provide a geometric interpretation.
|
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.
|
eng_Latn
| 132,403 |
We consider a problem of the consistent deformation of physical system introducing a new features, but preserving its fundamental properties. In particular, we study how to implement the noncommutativity of space-time without violation of the rotational symmetry in quantum mechanics or the Lorentz symmetry in f{i}eld theory. Since the canonical (Moyal) noncommutativity breaks the above symmetries one should work with more general case of coordinate-dependent noncommutative spaces, when the commutator between coordinates is a function of these coordinates. F{i}rst we describe in general lines how to construct the quantum mechanics on coordinate-dependent noncommutative spaces. Then we consider the particular examples: the Hydrogen atom on rotationally invariant noncommutative space and the Dirac equation on covariant noncommutative space-time.
|
We consider the consistent deformation of the relativistic quantum mechanics introducing the noncommutativity of the space-time and preserving the Lorentz symmetry. The relativistic wave equation describing the spinning particle on coordinate dependent noncommutative space-time (noncommutative Dirac equation) is proposed. The fundamental properties of this equation, like the Lorentz covariance and the continuity equation for the probability density are verified. To this end using the properties of the star product we derive the corresponding probability current density and prove its conservation. The energy-momentum tensor for the free noncommutative spinor field is calculated. We solve the free noncommutative Dirac equation and show that the standard energy-momentum dispersion relation remains valid in the noncommutative case.
|
Conjugacy separability of any group of the class of one-relator groups given by the presentation $ $ ($m,n>1$) is proven.
|
eng_Latn
| 132,410 |
Thimble regularization at work besides toy models: from Random Matrix Theory to Gauge Theories
|
Thimble regularization as a solution to the sign problem has been successfully put at work for a few toy models. Given the non trivial nature of the method (also from the algorithmic point of view) it is compelling to provide evidence that it works for realistic models. A Chiral Random Matrix theory has been studied in detail. The known analytical solution shows that the model is non-trivial as for the sign problem (in particular, phase quenched results can be very far away from the exact solution). This study gave us the chance to address a couple of key issues: how many thimbles contribute to the solution of a realistic problem? Can one devise algorithms which are robust as for staying on the correct manifold? The obvious step forward consists of applications to gauge theories.
|
Probabilistic version of the invariance of domain for contractive field and ::: Schauder invertibility theorem are proved. As an application, the stability of ::: probabilistic open embedding is established.
|
eng_Latn
| 132,425 |
The development of a heterologous transformation system for the cellulolytic fungus Trichoderma reesei based on a pyrG-negative mutant strain
|
Six uridine auxotroph mutants of Trichoderma reesei QM 9414 were isolated by resistance to 5-fluoroorotic acid and one strain was identified as OMP-decarboxylase negative (pyr-) by a radiometric enzyme assay. Transformation to uridine prototrophy was achieved with the pyr4 gene of Neurospora crassa (up to 1500 transformants/μg) and with pyrA of Aspergillus niger (700–800 transformants/μg). In many transformants the PYR+ function seems to be present as extrachromosomal DNA. There is evidence for a correlation between the stability of transformants and integration of the vector in the genome whereas unstable transformants are obtained when autonomous replication of the plasmid occurs.
|
We study multiple orthogonal polynomials of Meixner-Pollaczek type with respect to a symmetric system of two orthogonality measures. Our main result is that the limiting distribution of the zeros of these polynomials is one component of the solution to a constrained vector equilibrium problem. We also provide a Rodrigues formula and closed expressions for the recurrence coefficients. The proof of the main result follows from a connection with the eigenvalues of block Toeplitz matrices, for which we provide some general results of independent interest. ::: The motivation for this paper is the study of a model in statistical mechanics, the so-called six-vertex model with domain wall boundary conditions, in a particular regime known as the free fermion line. We show how the multiple Meixner-Pollaczek polynomials arise in an inhomogeneous version of this model.
|
eng_Latn
| 132,426 |
The fibre type composition of thoracic and lumbar paravertebral muscles in man.
|
Samples of longissimus and multifidi muscles at the thoracic and lumbar levels of the spine were examined histochemically on autopsy specimens from 21 adult male subjects (aged 22 to 46 years) and on biopsies from 17 adult patients during surgery for disorders of the lumbar intervertebral disc. In the superficial and deep thoracic muscles, 74% of fibres were of the Type I variety. In the lumbar region, Type I fibres amounted to 57% in the superficial, and to 63% in the deep muscles. The diameter of Type I fibres was significantly greater than that of Type II fibres.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,439 |
Geochemistry: A dash of deep nebula on the rocks
|
The cocktail of noble-gas isotopes in an Icelandic rock suggests that the upper mantle does not, and never did, receive gas from a deeper mantle reservoir. This challenges ideas of deep Earth's behaviour and formation. See Letter p.101
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,440 |
Nonnegative singular control systems using the Drazin projector
|
Abstract In this work we study conditions for guaranteeing the nonnegativity of a discrete-time singular control system. A first approach can be found in the literature for general systems, using the whole coefficient matrices. Also, the particular case of matrices of index 1 has been treated by using a block decomposition and the group-projector of the matrix that gives the singularity to the system. In order to complete this study, an analysis of the nonnegativity of a singular control system for matrices having arbitrary index is done by means of the core–nilpotent decomposition. This technique allows us to reduce the size of the original matrices, improving the results where the whole coefficients are involved.
|
We experimentally realized a waveguide device with alternating positive and negative coupling and show that this geometry is an optical simulator of the conditions found for a massless relativistic particle described by the one-dimensional Dirac-equations.
|
eng_Latn
| 132,452 |
Brachydactyly type A-7 (Smorgasbord): a new entity
|
We report a family with a form of brachydactyly that involves characteristic features of types A2 and D brachydactyly plus features found in other types of brachydactyly and also features not previously noted. This set of findings represents a new syndrome, which we have termed brachydactyly type A7 (Smorgasbord).
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,453 |
A Spectral Rotation Approach for the Efficient Calculation of the Mutual Coupling Between Rectangular Apertures
|
In this letter, a procedure based on the spectral rotation is introduced that allows us to calculate the mutual coupling between apertures in the spectral domain without evaluating any convolution products (reaction integral) directly. A numerical evaluation of the computational cost is presented to show the efficiency of the method for electrically large problems. Numerical examples are given to highlight the agreement between the spatial and spectral rotation methods. Finally, the procedure is applied for the de sign of a horn antenna array with rotated apertures.
|
We study in this paper the properties of a two-body random matrix ensemble for distinguishable spins. We require the ensemble to be invariant under the group of local transformations and analyze a parametrization in terms of the group parameters and the remaining parameters associated with the 'entangling' part of the interaction. We then specialize to a spin chain with nearest-neighbour interactions and numerically find a new type of quantum-phase transition related to the strength of a random external field, i.e. the time-reversal-breaking one-body interaction term.
|
eng_Latn
| 132,455 |
ON THE INSTANTON MODULI SPACES OF NEGATIVE DIMENSIONS
|
It is shown that if the contribution of flat connections on the dimension of the moduli spaces of Yang–Mills instantons and anti-instantons is appropriately taken into the account, then the inadmissible cases of negative dimensions may be reduced to zero-dimensional moduli spaces, corresponding to a collection of points, and whose counting will correspond to the Donaldson invariant of the base manifold. These results will lead to a possible description of that invariant in terms of flat connections with diverse applications, for example for testing the conjecture on its equivalence to the Seiberg–Witten invariant, and for the study of the qualitative and quantitative aspects of the gauge/gravity duality.
|
Using inelastic scattering of polarized neutrons near a finite Bragg reflection, the dynamics of longitudinal \ensuremath{\delta}S(q)\ensuremath{\parallel}q and transverse \ensuremath{\delta}S(q)\ensuremath{\perp}q spin fluctuations have been measured. The relaxation rates ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{\ensuremath{\alpha}}}$ follow rather precisely the dipolar dynamic-scaling function calculated recently by mode-coupling theory based on the Lorentzian approximation. The predicted longitudinal line shape near ${\mathit{T}}_{\mathit{C}}$ disagrees with our data.
|
yue_Hant
| 132,462 |
Coulomb correlations and two-photon spectra of conjugated polymers
|
Abstract Electron—electron correlations in conjugated polymers are shown to produce weak two-photon absorption (TPA) below the one-photon gap E g and intense TPA above E g . TPA intensities vary strongly with the alternation δ of transfer integrals t (1 ± δ) and with U/t in Hubbard models. Pariser—Parr—Pople (PPP) models reconcile TPA spectra of conjugated molecules and polymers.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,464 |
Multivariate Tight Wavelet Frames with Few Generators and High Vanishing Moments.
|
Tight wavelet frames are computationally and theoretically attractive, but most existing multivariate constructions have various drawbacks, including low vanishing moments for the wavelets, or a large number of wavelet masks. We further develop existing work combining sums of squares representations with tight wavelet frame construction, and present a new and general method for constructing such frames. Focusing on the case of box splines, we also demonstrate how the flexibility of our approach can lead to tight wavelet frames with high numbers of vanishing moments for all of the wavelet masks, while still having few highpass masks: in fact, we match the best known upper bound on the number of highpass masks for general box spline tight wavelet frame constructions, while typically achieving much better vanishing moments for all of the wavelet masks, proving a nontrivial lower bound on this quantity.
|
We study in this paper the properties of a two-body random matrix ensemble for distinguishable spins. We require the ensemble to be invariant under the group of local transformations and analyze a parametrization in terms of the group parameters and the remaining parameters associated with the 'entangling' part of the interaction. We then specialize to a spin chain with nearest-neighbour interactions and numerically find a new type of quantum-phase transition related to the strength of a random external field, i.e. the time-reversal-breaking one-body interaction term.
|
eng_Latn
| 132,470 |
Second hyperpolarizabilities of 1-center radicals
|
Abstract We study the second hyperpolarizabilities ( γ) for 1-center radicals, i.e. , BH 3 − , CH 3 and NH 3 + . It is found that magnitudes of γ( ¦γ¦) of the radicals are sensitively influenced by features of each charged state. It is also found that electron-correlation dependence of γ can be related to the resonance structure contributing to the ground state of the molecules
|
Abstract Using order statistics, we prove Gauss' 2F1 identity probabilistically. As a consequence, we show that Gauss' 2F1 summation formula is related to an inverse Polya distribution. We observe that a relationship exists between WZ-pairs and our probabilistic approach.
|
eng_Latn
| 132,471 |
Axial anomaly of QED in a strong magnetic field and noncommutative anomaly
|
The Adler-Bell-Jackiw (ABJ) anomaly of a 3+1 dimensional QED is calculated in the presence of a strong magnetic field. It is shown that in the regime with the lowest Landau level (LLL) dominance a dimensional reduction from D=4 to D=2 dimensions occurs in the longitudinal sector of the low energy effective field theory. In the chiral limit, the resulting anomaly is therefore comparable with the axial anomaly of a two-dimensional massless Schwinger model. It is further shown that the U{sub A}(1) anomaly of QED in a strong magnetic field is closely related to the nonplanar axial anomaly of a conventional noncommutative U(1) gauge theory.
|
In this paper we study the multivariate ANOVA decomposition for $1$-periodic functions on the torus. In particular we use the integral projection operator that leads to the classical ANOVA decomposition. Relationships between the Fourier coefficients of the function and its ANOVA terms lead to special frequency index sets and give an understanding of the decomposition working in the frequency domain. Moreover, we consider the truncated ANOVA decomposition and provide error bounds for approximation in $\mathrm{L}_\infty$ and $\mathrm{L}_2$. We present an approximation method based on the truncated decomposition with regard to a superposition dimension $d_s$.
|
eng_Latn
| 132,472 |
Vortex axicons for hypergeometric beams formation
|
Abstract A method for obtaining multi-ring distributions by using combinations of diffractive optical elements (DOE) for the formation of hypergeometric (HG) vortices is described. The calculated vortex axicons form a superposition of two HG vortices due to a combination of two logarithmic axicons in the phase function. Experimental results on the optical capture and transport of polystyrene microparticles with a diameter of 5 μm using calculated DOEs are presented.
|
We study multiple orthogonal polynomials of Meixner-Pollaczek type with respect to a symmetric system of two orthogonality measures. Our main result is that the limiting distribution of the zeros of these polynomials is one component of the solution to a constrained vector equilibrium problem. We also provide a Rodrigues formula and closed expressions for the recurrence coefficients. The proof of the main result follows from a connection with the eigenvalues of block Toeplitz matrices, for which we provide some general results of independent interest. ::: The motivation for this paper is the study of a model in statistical mechanics, the so-called six-vertex model with domain wall boundary conditions, in a particular regime known as the free fermion line. We show how the multiple Meixner-Pollaczek polynomials arise in an inhomogeneous version of this model.
|
eng_Latn
| 132,481 |
Complex-quaternionic analysis applied to spin-½ massless fields
|
In the paper the complex-quaternionic analysis and its spinor version is used for the study of integral formulas for spin ½ massless fields. The basic corrspondence between the complexified Fueter equation and the massless field equation (spin½) is described first, together with the corresponding Cauchy integral formulas. It is shown then how the complexified Cauchy integral formula can be used to give the connection between elliptic type (boundary value type) integral formulas on Euclidean spacetime and Kirchhoff type (initial value type) integral formulas on Minkowski space (for spin ½ massless fields). The explicit formulas showing such connection with the integral formula described by Penrose are given.
|
ABSTRACTThis paper aims to develop, assess, and numerically implement analytical models for the newly introduced Quintuple Friction Pendulum Isolator (QFPI) which can identically capture its real e...
|
eng_Latn
| 132,490 |
Nonlocal isotopic representation of the Cooper pair in superconductivity
|
The authors study a model of the Cooper pair in superconductivity whose basic mechanism is due to nonlinear-nonlocal and non-Hamiltonian interactions. The authors show the capability of the model for representing available data while possessing intriguing predictive capacities, and the authors propose its experimental verification. 16 refs., 3 figs., 1 tab.
|
We present calculations for {sup 8}Be-{sup 8}Be cluster states in {sup 16}O based on our recent schematic coupled-channels model. We justify some of the approximations made in the schematic model in this paper. The present calculations broadly support our assumptions about the states in {sup 16}O which formed the basis of our previous calculations in {sup 24}Mg. {copyright} {ital 1996 The American Physical Society.}
|
eng_Latn
| 132,504 |
Exact diagonalization calculations of hole binding around Ni impurities in Ni-substituted cuprate superconductors
|
We examine the influence of Ni impurity in cuprates on the distribution of hole carriers by performing numerically exact diagonalization calculations for a model consisting of $\text{Cu}\text{ }3d$, $\text{Ni}\text{ }3d$, and $\text{O}\text{ }2p$ orbitals. Using realistic parameters for the system, we find that a hole is predominantly bound to $\text{O}\text{ }2p$ orbitals around the Ni impurity forming the Zhang-Rice doublet. This imposes strong restrictions on modeling Ni-substituted cuprates. We propose a resonant inelastic x-ray scattering experiment for $\text{Ni}\text{ }K$ edge to confirm hole binding around the Ni impurity.
|
Abstract In this work we study conditions for guaranteeing the nonnegativity of a discrete-time singular control system. A first approach can be found in the literature for general systems, using the whole coefficient matrices. Also, the particular case of matrices of index 1 has been treated by using a block decomposition and the group-projector of the matrix that gives the singularity to the system. In order to complete this study, an analysis of the nonnegativity of a singular control system for matrices having arbitrary index is done by means of the core–nilpotent decomposition. This technique allows us to reduce the size of the original matrices, improving the results where the whole coefficients are involved.
|
eng_Latn
| 132,510 |
www.elsevier.com/locate/cpc A band factorization technique for transition matrix element asymptotics
|
A new method of evaluating transition matrix elements between wave functions associated with orthogonal polynomials is proposed. The technique relies on purely algebraic manipulation of the associated recurrence coefficients. The form of the matrix elements is perfectly suited to very large quantum number calculations by using asymptotic series expansions. In practice, this allows the accurate and fast numerical treatment of transition matrix elements in the quasi-classical limit. Examples include the matrix elements of xp in the harmonic oscillator basis, and connections with the Wigner 3j symbols.
|
In this paper we study the multivariate ANOVA decomposition for $1$-periodic functions on the torus. In particular we use the integral projection operator that leads to the classical ANOVA decomposition. Relationships between the Fourier coefficients of the function and its ANOVA terms lead to special frequency index sets and give an understanding of the decomposition working in the frequency domain. Moreover, we consider the truncated ANOVA decomposition and provide error bounds for approximation in $\mathrm{L}_\infty$ and $\mathrm{L}_2$. We present an approximation method based on the truncated decomposition with regard to a superposition dimension $d_s$.
|
eng_Latn
| 132,520 |
Structural Parameter Of Scissor-Type Lifting Platform And Its Scissor Arm Optimization
|
In this paper,the structural feature of scissor-type lifting platform is introduced,and its structural parameters is analyzed.By using finite element software ANSYS,the scissor arm of scissor-type lifting platform is optimized,and the most reasonable dimension is got.On the premise of meeting engineering requirement,the utilization ratio of material is improved.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,527 |
Relativistic configuration interaction calculations on Kα x-ray satellites of krypton
|
The multi-configuration Dirac–Fock (MCDF) and relativistic configuration interaction (RCI) methods have been used for computing the transition wavelengths, electric dipole transition probabilities, line strengths and absorption oscillator strengths for the Kα x-rays from Kr XXVII to Kr XXXV. The contributions from Breit interaction, finite nuclear mass corrections and quantum electrodynamics corrections to the initial and final levels have been taken into account. The calculated values showed good agreement between these results and recent theoretical and experimental results. These data provide reference values for the level lifetimes, charge state distribution and average charge of krypton plasmas.
|
We consider families of operators satisfying a general class of relations, whose solutions can be described in terms of orbits of some dynamical system acting on the spectrum of a commuting sub-family. In the first section we introduce a class of relations and show, how the representations of such relations are related to orbits of the corresponding dynamical system. Also, we discuss the problem of accurate sense of the relation for unbounded operators. In Section 2, we study the class of *-algebras allowing Wick ordering whose representations can be studied by using methods of Section 1. We classify such Wick *-algebras, and discuss their representations.
|
eng_Latn
| 132,534 |
Algebraic and Geometric Structures in String Backgrounds
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
In this paper we investigate the metric hierarchy for distance-regular graphs: in particular, we classify the graphs in the title.
|
eng_Latn
| 132,549 |
Evidence for a small component of circular polarization in relativistic electron bremsstrahlung
|
Using a transmission type polarimeter, an asymmetry has been found that can be ascribed to a circularly polarized component in the bremsstrahlung beam of unpolarized relativistic electrons from the Mainz electron linac, in the region of electron energiesEel between 140 and 400 MeV. The experiment is described in detail. Systematical errors are discussed. For a comparison with electroweak theory, an exact calculation for small photon emission angles (of the order ofm c2/Eel) is needed.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,553 |
QUANTUM GELFAND-LEVITAN EQUATIONS FOR NONLINEAR SCHRODINGER MODEL OF SPIN-1/2 PARTICLES
|
The quantum Gelfand-Levitan equations for the nonlinear Schroedinger model of spin-(1/2) particles are obtained. Two Izergin-Korepin relations are used in the derivation. A new type commutation relation of L operators is introduced to get the commutation relations which are needed for the study of S matrices and Green's functions. As examples, the four-point Green's functions and the two-body S matrices are given.
|
We describe preliminary results from an effort to quantify the uncertainties in parton distribution functions and the resulting uncertainties in predicted physical quantities. The production cross section of the $W$ boson is given as a first example. Constraints due to the full data sets of the CTEQ global analysis are used in this study. Two complementary approaches, based on the Hessian and the Lagrange multiplier method respectively, are outlined. We discuss issues on obtaining meaningful uncertainty estimates that include the effect of correlated experimental systematic uncertainties and illustrate them with detailed calculations using one set of precision DIS data.
|
yue_Hant
| 132,555 |
Scattering of γ-rays by germanium K-shell electrons
|
Abstract The new interest of a study of the incoherent γ-ray scattering on bound electrons is pointed out. An experimental set-up is described; it allows angular- and energy-distribution measurements on germanium K-shell electrons. Performances and preliminary results obtained with an incoming energy of 662 keV are given.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,562 |
A Chain Model of a Zigzag Contact of Lateral Graphene-Like Heterostructures
|
A simple structural model is proposed for the zigzag interface formed by contacting two-dimensional graphene-like compounds AB and CD (both free and formed on a metal). For the graphene–hexagonal boron nitride system, analytical expressions for the electron spectrum, density of states, and atom occupation numbers at the interface are obtained. The results of calculating the densities of states and occupation numbers within two alternative approximations are in good agreement.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,564 |
Optimization framework for derogating SDCCH and TCH congestions in Liberia global system for mobile communications (GSM)
|
A thesis submitted to the Department of Electrical/Electronic Engineering, ::: Kwame Nkrumah University of Science and Technology in fulfillment of the ::: Requirements for the degree ::: Of ::: Master of Science (Telecommunications Engineering), 2014
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,583 |
Topological surprises in de Sitter QFT in two-dimensions
|
Motivated by the study of soluble models of quantum field theory, we illustrate a new type of topological effect by comparing the constructions of canonical Klein-Gordon quantum fields on the two-dimensional de Sitter spacetime as opposed to its double covering. We show that the while commutators of the two fields coincide locally, the global topological differences make the theories drastically different. Many of the well-known features of de Sitter quantum field theory disappear. In particular there is nothing like a Bunch-Davies vacuum. Correspondingly, even though the local horizon structure is the same for the two universes there is no Hawking - Gibbons thermal state. Finally, there is no complementary series of fields.
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In this paper, we investigate the evolution of quaternionic curve in Euclidean 4-space $\mathbb{R}^{4}$. We obtain evolution equations of the Frenet frame and curvatures. Then we give integrability conditions for the evolutions. Finally we give examples of evolution of curvatures.
|
eng_Latn
| 132,584 |
Doubly-Excited States of Beryllium-Like Ions
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The resonance energies and widths for doubly-excited (1s23d2, 3p4f, 3d4d) 1Ge states of beryllium-like ions are determined by calculating the density of resonance states using the stabilization method. A model potential is used to represent the interaction between the outer electrons and the core electrons. Products of Slater Orbitals are used to represent the two-electron wave functions. We present results for some lower-lying doubly-excited states for Z = 5-10. Comparisons are made with other calculations in the literature.
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Berglund-H\"ubsch duality is an example of mirror symmetry between orbifold Landau-Ginzburg models. In this paper we study a D-module-theoretic variant of Borisov's proof of Berglund-H\"ubsch duality. In the $p$-adic case, the D-module approach makes it possible to endow the orbifold chiral rings with the action of a non-trivial Frobenius endomorphism. Our main result is that the Frobenius endomorphism commutes with Berglund-H\"ubsch duality up to an explicit diagonal operator.
|
eng_Latn
| 132,597 |
Partition function of non-supersymmetric black holes in the supergravity limit
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In this paper, we propose a free energy for general non-supersymmetric black hole attractors (with vanishing D0-brane charge) arising in type IIA(B) superstrings on 3-fold Calabi–Yau, in the supergravity limit. This, by definition, differs from its counterpart BPS free energy by a factor of 4. Correspondingly, a mixed ensemble for these black holes is proposed.
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The novel contribution of this paper relies in the proposal of a fully implicit numerical method designed for nonlinear degenerate parabolic equations, in its convergence/stability analysis, and in the study of the related computational cost. In fact, due to the nonlinear nature of the underlying mathematical model, the use of a fixed point scheme is required and every step implies the solution of large, locally structured, linear systems. A special effort is devoted to the spectral analysis of the relevant matrices and to the design of appropriate iterative or multi-iterative solvers, with special attention to preconditioned Krylov methods and to multigrid procedures: in particular we investigate the mutual benefit of combining in various ways suitable preconditioners with V-cycle algorithms. Numerical experiments in one and two spatial dimensions for the validation of our multi-facet analysis complement this contribution.
|
eng_Latn
| 132,601 |
GEOMETRIC PHASES IN THE QUANTISATION OF BOSONS AND FERMIONS
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After reviewing geometric quantisation of linear bosonic and fermionic systems, we study the holonomy of the projectively flat connection on the bundle of Hilbert spaces over the space of compatible complex structures and relate it to the Maslov index and its various generalisations. We also consider bosonic and fermionic harmonic oscillators parametrised by compatible complex structures and compare Berry’s phase with the above holonomy.
|
Abstract Kim et al. (Appl. Math. Inf. Sci. 9(6):1-6, 2015) consider the q -extensions of Boole polynomials. In this paper, we consider Witt-type formula for the q -Boole polynomials with weights and derive some new interesting identities and properties of those polynomials and numbers from the Witt-type formula which are related to special polynomials and numbers.
|
yue_Hant
| 132,618 |
Hodge and Laplace–Beltrami operators for bicovariant differential calculi on quantum groups
|
For bicovariant differential calculi on quantum matrix groups a generalisation of classical notions such as metric tensor, Hodge operator, codifferential and Laplace–Beltrami operator for arbitrary k-forms is given. Under some technical assumptions it is proved that Woronowicz' external algebra of left-invariant differential forms either contains a unique form of maximal degree or it is infinite-dimensional. Using Jucys–Murphy elements of the Hecke algebra, the eigenvalues of the Laplace–Beltrami operator for the Hopf algebra \(\mathcal{O}\)(SLq(N)) are computed.
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The main objective of this article is to study dynamic of the ::: three-dimensional Boussinesq equations with the periodic boundary ::: condition.We prove that when the Rayleigh number $R$ crosses the ::: first critical Rayleigh number $R_c$, the Rayleigh-Benard problem ::: bifurcates from the basic state to an global attractor $\Sigma$, which is homeomorphic to $S^3$.
|
eng_Latn
| 132,623 |
Knot polynomial states of quantum gravity in terms of loops and extended loops: Some remarks
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In this paper we review the status of several solutions to all the constraints of quantum gravity that have been proposed in terms of loops and extended loops, based on knot polynomials. We discuss pitfalls of several of the results, and in particular the issues of covariance and regularization of the constraints in terms of extended loops. We also propose a formalism for ‘‘thickened out loops,’’ which does not face the covariance problems of extended loops and may allow to regularize expressions in a consistent manner.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,636 |
On a Quarter-Symmetric Metric Connection in an LP-Sasakian Manifold
|
The object of the present paper is to study a quarter-symmetric metric connection in an LP-Sasakian manifold. We study some curvature properties of an LP-Sasakian manifold with respect to the quarter-symmetric metric connection.
|
Measurements performed at the Tevatron of both the like-sign dimuon charge asymmetry inBd;s-meson samples and the mixing-induced CP asymmetry inBs! J= depart from their standard model (SM) predictions. This could be an indication for new CP phases in B = 2 transitions, preferentially in Bs{ Bs mixing. The experimental situation, however, remained inconclusive, as it favored values of the element s of the decay matrix in the Bs-meson system that are notably dierent
|
eng_Latn
| 132,646 |
Adiabatic dynamics of instantons on $S ^4 $
|
We define and compute the L 2 metric on the framed moduli space of circle invariant 1-instantons on the 4-sphere. This moduli space is four dimensional and our metric is \({SO(3) \times U(1)}\) symmetric. We study the behaviour of generic geodesics and show that the metric is geodesically incomplete. Circle-invariant instantons on the 4-sphere can also be viewed as hyperbolic monopoles, and we interpret our results from this viewpoint. We relate our results to work by Habermann on unframed instantons on the 4-sphere and, in the limit where the radius of the 4-sphere tends to infinity, to results on instantons on Euclidean 4-space.
|
Preface Bose-Einstein Condensation in Nonlinear System New Aspects of Relaxation Processes in Cryogenic Solids Induction Transformer Coupled Discharges: Investigation & Application P-Type InGaAs/AlGaAs Quantum Well Structures for Infrared Photodetection A D-3He Spherical Tokamak Reactor with the Plasma Current Ramp-Up by Vertical Field 5-Dimension Space-Time Field Theory & Realization of Matter Chemical Physics of Phonons & Superconductivity: A Heuristic Approach Description of the Ultraslow Light Phenomenon in Atomic Bose Condensates in the Framework of the Microscopic Approach Energy Decay Mechanism of Quantum Grid Turbulence in He II Below 1 K Dark Matter Haloes as Fruits of Merger Trees in a CDM Garden Application of GEANT4 Code in Gamma Irradiation Processing Stochastic Dynamic Systems with Long-Range Correlations: Basic Notions & Applications Index.
|
eng_Latn
| 132,663 |
The pasta structure in the hadron-quark phase transition and the effects on magnetized compact stars
|
We report the effects of quark-hadron phase transition on the structures of general relativistic stars with purely toroidal magnetic field. For the mixed phase, we take into account of the finite-size effects, which lead to non-uniform"Pasta"structures. Our study is based on axisymetric and stationary formalism including purely toroidal magnetic field. For hybrid stars, we find the characteristic distribution of magnetic field, which has a discontinuity originated in the quark-hadron mixed phase. These distributions of magnetic field will change astrophysical phenomena, such as cooling processes.
|
Certain structural aspects of two-dimensional Penrose tilings are studied using de Bruijn's pentagrid picture. The authors discuss the statistics of hexagons, decagons and 'worms' (sequences of adjacent hexagons bounded by two decagons). They show that within the discrete framework considered here, phason modes and structural transformation modes are located along particular 'worms' and they derive the spatial distribution of the latter.
|
eng_Latn
| 132,671 |
Computation of Pseudo Strain Energy and Paris Law Fracture Coefficients from Surface Energy and Uniaxial Strain-Controlled Tension Test Data
|
Dissipated pseudo strain energy (DPSE) and Paris' law fracture coefficients constitute input parameters for fracture characterization of hot-mix asphalt concrete (HMAC) mixtures in continuum fracture-damage mechanics and energy based fatigue analysis approaches. In this paper, numerical analysis models for computing DPSE and Paris' law fracture coefficients from surface energy (SE) and uniaxial strain-controlled tension test data are presented. The applicability of the DPSE, Paris' law fracture coefficients, and the associated laboratory tests for comparatively quantifying HMAC mixture fracture properties including investigating the effects of aging is also presented. Analysis of the results indicated that the models utilized together with the computed parameters and the related laboratory tests provide a fundamental methodology of comparatively characterizing the fracture properties of HMAC mixtures. The numerical values obtained were within theoretical expectations. The results further showed that aging...
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,674 |
Coulomb crystals of few particles: Closed-form expressions for equilibrium energies and geometries, and vibrational force constants
|
Abstract Analytical expressions for equilibrium energies and geometries, and the corresponding vibrational force constants are derived for clusters of between three and eight particles interacting through a pairwise potential of the form ϵ ( r ) = ( 1 / 3 ) ( r 2 + 2 r - 1 ) . In the case of five-, seven-, and eight-particle clusters, these expressions are functions of single parameters that are the larger real roots of respective twelfth-degree polynomials.
|
A method of solving the eikonal equation, in either flat or curved space–times, with arbitrary Cauchy data, is extended to the case of data given on a characteristic surface. We find a beautiful relationship between the Cauchy and characteristic data for the same solution, namely they are related by a Legendre transformation. From the resulting solutions, we study and describe the wave-front singularities that are associated with their level surfaces (the characteristic surfaces or “big wave fronts”).
|
eng_Latn
| 132,680 |
Wigner function approach to polarization-vorticity coupling and hydrodynamics with spin
|
Newly introduced equilibrium Wigner functions for particles with spin one-half are used in the semi-classical kinetic equations to study a possible relation between thermal vorticity and spin polarization. It is shown that in global equilibrium both the thermal-vorticity and spin polarization tensors are constant but not necessarily equal. In the case of local equilibrium, we define a procedure leading to hydrodynamic equations with spin. We introduce such equations for the de~Groot, van~Leeuwen, and van~Weert (GLW) formalism as well as for the canonical scheme (these two frameworks differ by the definitions of the energy-momentum and spin tensors). It is found that the GLW and canonical versions are connected by a pseudo-gauge transformation.
|
This paper presents derivation of the probability distribution for the area enclosed by a polymer loop in a gel and under different external fields using white noise analysis. In this context, the polymer loop is represented by Brownian paths and its immersion in a gel constraints it to occupy a constant area[1]. The external fields considered are electric field, and crossed electric-magnetic fields.
|
eng_Latn
| 132,682 |
Neutron stars in Einstein-aether theory
|
As current and future experiments probe strong gravitational regimes around neutron stars and black holes, it is desirable to have theoretically sound alternatives to general relativity against which to test observations. Here we study the consequences of one such generalization, Einstein-aether theory, for the properties of non-rotating neutron stars. This theory has a parameter range that satisfies all current weak-field tests. We find that within this range it leads to lower maximum neutron star masses, as well as larger surface redshifts at a particular mass, for a given nuclear equation of state. For non-rotating black holes and neutron stars, the innermost stable circular orbit is only slightly modified in this theory.
|
We give a brief introduction to the study of the algebraic structures -- and their geometrical interpretations -- which arise in the BRST construction of a conformal string background. Starting from the chiral algebra $\cA$ of a string background, we consider a number of elementary but universal operations on the chiral algebra. From these operations we deduce a certain fundamental odd Poisson structure, known as a Gerstenhaber algebra, on the BRST cohomology of $\cA$. For the 2D string background, the correponding G-algebra can be partially described in term of a geometrical G-algebra of the affine plane $\bC^2$. This paper will appear in the proceedings of {\it Strings 95}.
|
eng_Latn
| 132,696 |
Cusps and pseudo-cusps in strings with Y-junctions
|
We study the occurrence of cuspy events on a light string stretched between two Y-junctions with fixed heavy strings. We first present an analytic study and give a solid criterion to discriminate between cuspy and non-cuspy string configurations. We then describe a numerical code, built to test this analysis. Our numerical investigation allows us to look at the correlations between string network's parameters and the occurrence of cuspy phenomena. We show that the presence of large amplitude waves on the light string leads to cuspy events. We then relate the occurrence of cuspy events to features like the number of vibration modes on the string or the string's root-mean-square velocity.
|
Let 0 o , has the same behavior as the sequence sup |£Q|'/I 0. In other words, if we know all "far points" of supp Ff, we can wholly describe this behavior without any concrete calculation of ||Z)a/||p , a > 0 . A Paley-Wiener-Schwartz theorem for a nonconvex case, which is a consequence of the result, is given.
|
eng_Latn
| 132,709 |
I've always heard of such statements as $SU$ group describing our world even before I seriously learned physics. When learning about spin, someone spoke of $SU(2)$ but did not seriously explain. When learning isospin and hypercharge for particles made of $u, d, s,$ someone spoke of $SU(3)$ but did not give detailed explanation. When talking about the discovery of J/ψ, teacher (a experimentalist) say, well now with the charm quark, we need $SU(4)$. I am crazy, $SU$ is just special unitary matrix group, what are they talking about when relating these matrix with spin or particles? I hope someone could give me a detailed explanation about how these group is related to real world substances or recommend a book.
|
I was hoping someone could give an overview as to how the Lie groups $SO(3)$ and $SU(2)$ and their representations can be applied to describe particle physics? The application of Lie groups and their representations is an enormous field, with vast implications for physics with respect to such things as unification, but I what specifically made these groups of physical importance and why there study is useful. I have just started studying these two groups in particular, but from a mathematical perspective, I'd very much appreciate understanding some sort of physical motivation.
|
$SU(2)$ is the covering group of $SO(3)$. What does it mean and does it have a physical consequence? I heard that this fact is related to the description of bosons and fermions. But how does it follow from the fact that $SU(2)$ is the double cover of $SO(3)$?
|
eng_Latn
| 132,724 |
Any two dimensional orientable manifold is complex Let $M$ be a $2$-dimensional orientable manifold. Is $M$ a Riemann surface? If it is true, how can I show it? Thank you very much.
|
existence of complex structure in dimension 2 Does an orientable closed 2 manifold always admit a complex structure? I know that an almost complex doesn' t necessarily give rise to a complex structure(the almost complex structure should be integrable) I am studying 2 manifolds over R, and I wonder if an almost complex structure always exist? This almost structure may be chosen integrable? I ask because there are certain known results on the different possible geometries in dimension 2.I don' t know exactly how these manifolds (closed and orientable) are classifyied, but I know there are three cases. May be I am confused, and the complex structure is irrelevant to this classification. Some help please!
|
When can you build up all representations from the fundamental and antifundamental ones? Under what conditions can you determine all representations of a Lie algebra from the fundamental and antifundamental ones using just the tensor product, direct sum and Clebsch-Gordan decomposition? I think this is true for $\mathfrak{su}(2)$ and $\mathfrak{sl}(2,\mathbb{C})$, or at least that's what physics books lead me to believe! Is it true in general for semisimple Lie algebras?
|
eng_Latn
| 132,747 |
Can we distinguish between two mass distributions in spacetime having the same effect over a test partlicle Einstein's equation is $$8πT_{ab}=G_{ab}$$ where the left side contains the stress-energy tensor and the right side contains the Einstein tensor. Is there exactly one unique stress-energy tensor corresponding to a given spacetime curvature? Or is it possible for one curvature (i.e. one spacetime metric) to be produced by multiple different mass configurations
|
Is every solution of Einstein field equations unique? Einstein's equation is $$8 \pi T_{ab} = G_{ab},$$ where the left side contains the stress-energy tensor and the right side contains the Einstein tensor. Is there exactly one unique stress-energy tensor corresponding to a given spacetime curvature? Or is it possible for one curvature (i.e. one spacetime metric) to be produced by multiple different mass configurations?
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Is the harmonic oscillator potential unique in having equally spaced discrete energy levels? I was wondering if the good old quadratic potential was the only potential with equally spaced eigenvalues. Obviously you can construct others, such as a potential that is infinite in some places and quadratic in others, but that's only trivially different. I am not referring to equally spaced as a limiting behavior either, I mean truly integer spaced. Any ideas? If not, is there a proof for its uniqueness? If there are other potentials with equally spaced eigenvalues, can one use them as starting points for a free-field QFT? It would be interesting to know if there is a deeper mathematical relation between all of these potentials and whether they could be used to study interacting systems.
|
eng_Latn
| 132,801 |
Canadian Taxpayers Investing in U.S. Real Estate
|
A fair amount of Canadian taxpayers spend a substantial period of the year in the United States while retaining their Canadian resident status. New income tax rules in the United States related to the notion of residence play an important rule in the planning of the life of a taxpayer. The first part of this paper focuses on the American legislation in order to warn the taxpayers about the potential income tax consequences of spending time in the United States.The second part of this paper analyses the U.S. income tax legislation related to Canadian taxpayers who invest in U.S. real estate. Should the taxpayer use a corporation to hold the investment? Should that corporation be Canadian or American? These questions trigger a number of potential tax problems, some of which are discussed in this paper.
|
With the use of data and concrete examples, such as ::: a mini-case study, and a focus on the top 20 global players, this ::: thesis aims at tackling Capex issues in the telecom industry by ::: covering: – Uses, levels, inefficiencies in Capex management, ::: notably via insider perspective, and their impacts on capital ::: allocation; – Financing of Capex via debt and the recent ::: development of asset monetization; – Specific trends (NSA, VNOs) ::: and M&A in the telecom industry and their impacts on Capex, via ::: the case study of the French SFR-Numericable ::: transaction.
|
eng_Latn
| 132,860 |
Canadian Electricity Exports, Capital Costs, and US Trade Policy
|
This paper examines the debate on capital costs for publicly owned electric utilities in Canada, especially the effect of government guarantees on hydro borrowing. An examination of the borrowings of Hydro-Quebec and 46 American utilities from 1980-86 shows no significant effect of the provincial guarantee on Hydro-Quebec's interest rates during this period.
|
With the use of data and concrete examples, such as ::: a mini-case study, and a focus on the top 20 global players, this ::: thesis aims at tackling Capex issues in the telecom industry by ::: covering: – Uses, levels, inefficiencies in Capex management, ::: notably via insider perspective, and their impacts on capital ::: allocation; – Financing of Capex via debt and the recent ::: development of asset monetization; – Specific trends (NSA, VNOs) ::: and M&A in the telecom industry and their impacts on Capex, via ::: the case study of the French SFR-Numericable ::: transaction.
|
eng_Latn
| 132,861 |
Canada eyes impact of gambling
|
Betting has quadrupled in the past decade, with groups now asking lawmakers to study the social costs.
|
Many things were different in Toronto last week, but that's just a reflection of the changing times in the search industry.
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eng_Latn
| 132,876 |
Adaptive pinning synchronization control is studied for a class of fractional-order complex network systems which are constructed depending on small-world network algorithm. Based on the fractional-order stability theory, the suitable adaptive control scheme is designed to guarantee global asymptotic stability of all the nodes in complex network systems and the node selected algorithm is given. In numerical implementation, it is shown that the numerical solution of the fractional-order complex network systems can be obtained by applying an improved version of Adams-Bashforth-Moulton algorithm. Furthermore, simulation results are provided to confirm the validity and synchronization performance of the advocated design methodology.
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Interaction of two identical excitable spiral waves in a bilayer system is studied. We find that the two spiral waves can be completely synchronized if the coupling strength is sufficiently large. Prior to the complete synchronization, we find a new type of weak synchronization between the two coupled systems, i.e., the spiral wave of the driven system has the same geometric shape as the spiral wave of the driving system but with a much lower amplitude. This general behavior, called projective synchronization of two spiral waves, is similar to projective synchronization of two coupled nonlinear oscillators, which has been extensively studied before. The underlying mechanism is uncovered by the study of pulse collision in one-dimensional systems.
|
This paper presents two novel generic adaptive batching schemes for replicated servers. Both schemes are oblivious to the underlying communication protocols. Our novel schemes adapt their batching levels automatically and immediately according to the current communication load. This is done without any explicit monitoring or calibration of the system. Additionally, the paper includes a detailed performance evaluation.
|
eng_Latn
| 133,044 |
In a distributed-computing environment, it is important to ensure that the processor work loads are adequately balanced. Among numerous load-balancing algorithms, a unique approach due to Das and Prasad defines a symmetric broadcast network (SBN) that provides a robust communication pattern among the processors in a topology-independent manner. In this paper, we propose and analyze three SBN-based load-balancing algorithms, and implement them on an SP2. A thorough experimental study with Poisson-distributed synthetic loads demonstrates that these algorithms are very effective in balancing system load while minimizing processor idle time. They also compare favorably with several existing techniques.
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In a distributed computing environment, it is important to ensure that the processor workloads are adequately balanced. Among numerous load-balancing algorithms, a unique approach given by Das and Prasad defines a symmetric broadcast network (SBN) that provides a robust communication pattern among the processors in a topology-independent manner. In this paper, we propose and analyze three efficient SBN-based dynamic load-balancing algorithms, and implement them on an SGI Origin2000. A thorough experimental study with Poisson-distributed synthetic loads demonstrates that our algorithms are effective in balancing system load. By optimizing completion time and idle time, the proposed algorithms are shown to compare favorably with several existing approaches.
|
In a distributed computing environment, it is important to ensure that the processor workloads are adequately balanced. Among numerous load-balancing algorithms, a unique approach given by Das and Prasad defines a symmetric broadcast network (SBN) that provides a robust communication pattern among the processors in a topology-independent manner. In this paper, we propose and analyze three efficient SBN-based dynamic load-balancing algorithms, and implement them on an SGI Origin2000. A thorough experimental study with Poisson-distributed synthetic loads demonstrates that our algorithms are effective in balancing system load. By optimizing completion time and idle time, the proposed algorithms are shown to compare favorably with several existing approaches.
|
eng_Latn
| 133,087 |
A synchronized mobile agent in Distributed Database Environments
|
This paper design and implements a synchronized agent mechanism that be able to synchronize SFT (Slow Frequency Transaction) data among e-business processes in distributed environment. This synchronized agent system is adopted to use mobile agent to guarantee the interoperability of the distributed processes and to solve some problems at the client/server architecture and proposes a policy to synchronize data of e-business processes on the any platforms of distributed heterogeneous systems. The proposed synchronization policy is based on the time-stamp transaction with the system priority on the unicasting transportation.
|
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
eng_Latn
| 133,156 |
A general modeling framework for swarms
|
Swarms are characterized by the ability to generate complex behavior from the coupling of simple individuals. While the swarm approach to distributed systems of moving agents is gradually finding a way to engineering applications, a true successful demonstration of an engineered swarm is still missing. One of the reasons for this is the gap between the complexity of the swarms studied in fundamental research and the complexity needed for the application to interesting control problems. In the majority of the research on swarm intelligent systems, the moving agents in the swarm are modeled as simple reactive agents. This model comprises too little intelligence to fully exploit the potential of swarms. In this paper, a general comprehensive swarm framework is introduced and related to the established state of the art. Such a framework is novel and it is a first and important step in the development and analysis of more complex and intelligent swarms.
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We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
eng_Latn
| 133,164 |
Method for authorizing lock permission and distributed lock manager
|
The embodiment of the invention provides a method for authorizing lock permission and a distributed lock manager, and aims to increase the authorizing efficiency of a lock resource manager in a distributed system for requested lock permission. The method comprises the following steps: receiving a lock request, and acquiring the lock permission requested by the lock request; when a judgment indicating that the requested lock permission does not conflict with the highest level of authorized lock permission recorded in the distributed lock manager is made according to a lock permission compatibility list, authorizing the requested lock permission; and returning the requested lock permission.
|
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
eng_Latn
| 133,172 |
A Multi-Query Optimization Algorithm Based on the Data Flow Processing Model
|
The current data processing is more and more complex,and the number of data increases more and more quickly.So the data flow processing model can process this effectively.The model is used for the main on-line and real-time data processing,which needs the timely returned results of the data processing.A new multi-query optimization algorithm called INCO is proposed based on the model,and the algorithm operates simply and does not involve other queries.The experiments prove that the algorithm is obviously better than other algorithms in connection queries.
|
Although MFA and MPA techniques have been mainly used for metabolic engineering [1], they may also be useful in other phases of the bioprocess development cycle, namely for advanced bioreactor monitoring and control [2,3]. A number of methods have been developed to study the structure of biochemical networks. From a process optimisation and control point of view, the elementary flux modes (EFMs) method is particularly attractive since it reduces network complexity to a minimal set of reactions. EFMs are unique for a given network and can be considered as nondecomposable steady state flux distributions using a minimal set of reactions.
|
kor_Hang
| 133,187 |
On Message.Dependent Deadlocks in Multiprocessor/Multicomputer Systems
|
The existence of multiple message types and associated intermessage dependencies in multiprocessor/multicomputer systems may cause message-dependent deadlock in networks that are designed to be free of routing deadlock. In this paper, we characterize the frequency of message-dependent deadlocks using empirical methods. Results show that message-dependent deadlocks occur very infrequently under typical circumstances, thus rendering approaches based on avoiding them overly restrictive in the common case.
|
We model cross-market Bitcoin prices as long-memory processes and study dynamic interdependence in a fractionally cointegrated VAR framework. We find long-memory in both the individual markets and the system of markets depicting non-homogeneous informational inefficiency. Moreover, Bitcoin markets are found to be fractionally cointegrated, where uncertainty negatively impacts this type of cointegration relationship.
|
eng_Latn
| 133,200 |
Energy-aware system design compiler methods for multiprocessors and Voltage Scaling/frequency
|
Most critical and major in growing technology for High Performance of demand of power & energy and an urgent problem in powering technologies. Energy optimization is an enabling power Management. The Consumption of Energy Should be ascertainable not only to Gate Level or Register Transfer (RT) Level but also to the System Level. Reducing the Energy Consumption of system not deviating the overall performance of the system. The compiler optimization will help to reduce power reduction at software level. Power management software level strategy is the code optimization by measuring the difficulties at where we can get profitable of investigate optimization criteria to minimization of overall energy consumption . The Energy consumption and run time computed for various compiler techniques on XScale Architecture using XEEMU tool. The optimized code picked out and code is tuned dynamically by varying voltage-frequency. The optimized codes are tuned dynamically.
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In the overall ownership cost of enterprise system, the maintenance cost consists of a major percentage. During the lifetime of an enterprise system, process customization is the most frequent maintenance efforts. However, current processing method has limited scalability and efficiency. In this case study, we explained how a scalable and efficient customization processing method was implemented. This method used the carbon emission trading mechanism to facilitate the cost benefit analysis of customization request. It also used distributed processing principle to improve the overall processing efficiency. Feedback from a pilot implementation in a large manufacturer included.
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eng_Latn
| 133,202 |
A ubiquitous communication system consider
|
For improving the performance of processors, the most schemes are exploiting the parallelism in multiprocessors. In this paper, we proposed communication unit to implement high-speed data transmission for inter-processor with a hybrid technique, which is combination of the schemes of interrupt, queue-network, and non-blocking. In order to delicately describe the state transform, we also exploit the discrete event driven model, Petri net model, to illustrate the communication handshaking for the inter-processor communication network (IPCN). We evaluate the communication delay time when the desired data transmits among processors of IPCN with different kinds of schemes and with different request-queue and data-queue size of communication unit. We also compare the performance of this proposed communication unit to that of the crossbar-based network structure.
|
We continue the study of bottom-up unranked tree automata with equality and ::: disequality constraints between direct subtrees. In particular, we show that ::: the emptiness problem for the nondeterministic automata is decidable. In ::: addition, we show that the universality problem, in contrast, is undecidable.
|
eng_Latn
| 133,212 |
Cache performance of vector processors
|
An instruction-level simulator for IBM 3090 with VF (vector facility) has been developed for studying the performance of vector processors and their memory hierarchies. Results of a study of the locality of several large scientific applications are presented. The cache miss ratios of vectorized applications are found to be almost equal to those of their original scalar executions. Moreover, both the spatial and temporal locality of these applications (in scalar and vector executions) are strong enough to show a sufficiently high hit ratio on conventional cache structures.<<ETX>>
|
Directed against the principle of count by time-sharing and based on the parameter model of electrolytic zinc process,an optimization model of power supply for electrolytic zinc is established in this paper.Particle swarm optimization algorithm is applied in time-sharing power supply optimal dispatching system,obtaining optimal time-sharing power supply scheme to production.Results show that this system can effectively decrease the power consumption and create great economic profits.
|
eng_Latn
| 133,223 |
Parallel programming: a new approach
|
The Par programming language regular problems irregular problems implementing Par related work.
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The problem of multiprocessor scheduling can be stated as scheduling a general task graph on a multiprocessor system such that a set of performance criteria will be optimized. This study investigates the use of near optimal scheduling strategies in multiprocessor scheduling problem. The multiprocessor scheduling problem is modeled and simulated using five different simulated annealing algorithms and a genetic algorithm. In this paper, the comparison of the simulation results of the simulated annealing algorithm, the modified versions of simulated annealing algorithms, and the genetic algorithm is presented. In addition, results of sensitivity analysis on the simulated annealing algorithm, the modified simulated annealing algorithms, and the genetic algorithm are included. 1999 AAAI. All rights reserved. (http://www.aaai.org)
|
eng_Latn
| 133,229 |
Multipurpose Dam Operation Models for Flood Control Using Fuzzy Control Technique ( II ) - Simulation of Historical Flood Events -
|
The objective of this study is to investigate the feasibility of the developed Fuzzy control techniques in dam operation. The simulated results for the 1984, 1990, and 1995 flood events are compared with historical operation results in the view of flood control and disaster prevention. The three models developed in this study determine the outflows based on the two conditions the first one is to consider only two inputs such as reservoir water level and inflow, for operation of the existing situations, the second one is that the possible maximum discharge from each dam does not exceed the allowable design maximum discharge for disaster prevention in downstream area. As the results, it was shown that the suggested models based on Fuzzy control technique could reduce both the peak water level and the maximum peak discharge compared with the historical operation results.
|
A new computer program architecture for the solution of finite elemet systems using concurrent processing is presented. The basic approach involves the automatic splitting of an arbitrary spatial domain. Processors are dynamically re-assigned during the several phases of an analysis. Direct and iterative solution strategies are considered. Computational algorithms for finite element dynamic analysis of large-scale structural problems that exploit concurrent features of MIMD computers are implemented in modules around the basic architecture. Also, problems with localized non-linearities are treated. A first implementation on a 32-processor hypercube achieves efficiency rates of up to 90 per cent.
|
eng_Latn
| 133,233 |
Comparison and analysis of greedy energy-efficient scheduling algorithms for computational grids
|
A computational grid is a distributed computational network, enabled with software that allows cooperation and the sharing of resources. The energy consumption of these large-scale distributed systems is an important problem. As our society becomes more technologically advanced, the size of these computational grids and energy consumption continue to increase. In this paper, we study the problem of optimizing energy consumption and makespan by focusing on different techniques to schedule the tasks to the computational grid. A computational grid is simulated using a wide range of task heterogeneity and size variety. The heuristics are used with the simulated computational grid and the results are compared extensively against each other.
|
We present a novel approach to the synchronization problem. It is a well-known fact that a problem of finding minimal (or: the shortest) synchronizing word (MSW) for a given synchronizing automaton is NP-complete. In this paper we present the genetic algorithm which tries, for a given automaton, to find possibly short word that synchronizes it. We use a modified version of a classical simple genetic algorithm (SGA).
|
eng_Latn
| 133,256 |
doi:10.1088/1742-6596/125/1/012079 Evaluation of SuperLU on multicore architectures
|
The Chip Multiprocessor (CMP) will be the basic building block for computer systems ranging from laptops to supercomputers. New software developments at all levels are needed to fully utilize these systems. In this work, we evaluate performance of different high- performance sparse LU factorization and triangular solution algorithms on several representative multicore machines. We included both Pthreads and MPI implementations in this study and found that the Pthreads implementation consistently delivers good performance and that a left-looking algorithm is usually superior.
|
This article argues that from a Union law perspective, and for greater legal certainty of third parties, it is important for the EU to be able to exercise its powers towards relevant international organisations in those areas where the EU has gained competences. There are cases where the EU has gained appropriate status corresponding to its competences, but this is not the case with the ILO where the EU still encounters difficulties in practice due to its insufficient status. The main focus of the article is on how the EU exercises its competences in the framework of the International Labour Organisation. Since the two organisations have overlapping spheres of activity, conflicts of norms between the EU and the ILO can occur in a number of fields. The article gives an overview of the complex and complicated procedure of coordination and its development.
|
kor_Hang
| 133,261 |
On Nondeterministic Unranked Tree Automata with Sibling Constraints
|
We continue the study of bottom-up unranked tree automata with equality and ::: disequality constraints between direct subtrees. In particular, we show that ::: the emptiness problem for the nondeterministic automata is decidable. In ::: addition, we show that the universality problem, in contrast, is undecidable.
|
We consider the problem of preemptively scheduling jobs on a single processor with the objective of minimizing the total weighted flowtime. Each job has a weight wi>0 which represents the job priority and a release date ri>=0, i.e., jobs can arrive at different times to the system. The problem is known to be NP-hard and finds practical applications in the areas of manufacturing systems, computer science, communications, logistics, and service industries. Two necessary conditions for the optimality of the problem are given first, and an enumerative algorithm for solving the problem based upon a branch and bound concept is then proposed. The algorithm uses these necessary conditions and a procedure for computing a lower bound at any node in the tree search that helps increase efficiency of the algorithm. Several test problems with different sizes were randomly generated and solved using the proposed algorithm.
|
eng_Latn
| 133,273 |
IP Traceback through modified Probabilistic Packet Marking algorithm using Chinese Remainder Theorem
|
Abstract Probabilistic Packet Marking algorithm suggests a methodology to identify all the participated routers of the attack path by probabilistically marking the packets. In this approach, these marked packets contain partial information regarding the routers of the attack path. At receiver, to get the complete information of every router, it requires more number of marked packets and hence more combinations and more false positives. To overcome this drawback we have presented a novel idea in finding the exact IP address of the routers in the attack path by applying Chinese Remainder Theorem. The result of our implementation reveals that our idea requires less number of marked packets and takes no time in constructing the attack path. The same idea is true even in the case of multiple attackers.
|
The Chip Multiprocessor (CMP) will be the basic building block for computer systems ranging from laptops to supercomputers. New software developments at all levels are needed to fully utilize these systems. In this work, we evaluate performance of different high- performance sparse LU factorization and triangular solution algorithms on several representative multicore machines. We included both Pthreads and MPI implementations in this study and found that the Pthreads implementation consistently delivers good performance and that a left-looking algorithm is usually superior.
|
eng_Latn
| 133,298 |
C-JDBC:Expandable Database Clustering Middleware
|
Clusters had been successfully used in the n-tiers structure software,but it lacks such cluster tools in the side of backend databases.So a lot of more expensive hardware are required if the database tier becomes the bottleneck.Clustered JDBC(C-JDBC) addresses before-mentioned problems.C-JDBC presented a single virtual database to the application through the JDBC interface.It does not require any modification to applications which based on database that provides the JDBC drivers.The flexible architecture of C-JDBC supports large and complex database cluster architectures,offering various perfor-mance,fault tolerance and usability.
|
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
kor_Hang
| 133,304 |
Design and Realization of Multi-thread and Intelligence Traffic Control Program with Java Language
|
This paper discusses the multi-thread of Java Object Oriented Programming(OOP) and it's application through a visual and typical illustration.Meanwhile,it specifies the programming process of Intelligence Traffic Control Program based on the OOP technical requirement,in which the most popular UML(Unified Modeling Language) technology is applied.
|
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
eng_Latn
| 133,316 |
Multi-thread Programmg Under Linux
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In this paper,LinuxThreads lib and realization of some methods of mutex and synchronization between multi thread were introduced,and the basic architecture of the program with linuxthreads was summarized.
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We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
swe_Latn
| 133,320 |
Toward software metrics for distributed software
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With increasingly complicated distributed software we must do our best to establish a maintenance mechanism. The paper presents generalized software complexity metrics for measuring the computational complexity of distributed programs, and introduces the notion of communication complexity unit based on the smallest process communication group. We affirm that the smallest process communication group is a unifying mechanism for event and process abstraction whatever distributed programming languages are used and advocate it as a basically generalized communication complexity unit.
|
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.
|
eng_Latn
| 133,322 |
From the Service-Oriented Architecture to the Web API Economy
|
A measurement study of google play
|
A fast parallel SGD for matrix factorization in shared memory systems
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eng_Latn
| 133,460 |
Dijkstra algorithm in parallel- Case study
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A Parallelization of Dijkstra's Shortest Path Algorithm
|
A First Look at Browser-Based Cryptojacking
|
eng_Latn
| 133,515 |
What college has a course about the cultural impact of wrestling?
|
With its growing popularity, professional wrestling has attracted attention as a subject of serious academic study and journalistic criticism. Many courses, theses, essays, and dissertations have analyzed wrestling's conventions, content, and its role in modern society. It is often included as part of studies on theatre, sociology, performance, and media. The Massachusetts Institute of Technology developed a course of study on the cultural significance of professional wrestling, and anthropologist Heather Levi has written an ethnography about the culture of lucha libre in Mexico.
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Many scholars (including Makdisi) have argued that early medieval universities were influenced by the religious madrasahs in Al-Andalus, the Emirate of Sicily, and the Middle East (during the Crusades). Other scholars see this argument as overstated. Lowe and Yasuhara have recently drawn on the well-documented influences of scholarship from the Islamic world on the universities of Western Europe to call for a reconsideration of the development of higher education, turning away from a concern with local institutional structures to a broader consideration within a global context.
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eng_Latn
| 133,573 |
What titles could women earn by going to Islamic schools?
|
According to the Sunni scholar Ibn ʻAsākir in the 12th century, there were opportunities for female education in the medieval Islamic world, writing that women could study, earn ijazahs (academic degrees), and qualify as scholars and teachers. This was especially the case for learned and scholarly families, who wanted to ensure the highest possible education for both their sons and daughters. Ibn ʻAsakir had himself studied under 80 different female teachers in his time. Female education in the Islamic world was inspired by Muhammad's wives, such as Khadijah, a successful businesswoman. According to a hadith attributed to Muhammad, he praised the women of Medina because of their desire for religious knowledge:
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During the rule of the Fatimid and Mamluk dynasties and their successor states in the medieval Middle East, many of the ruling elite founded madaris through a religious endowment known as the waqf. Not only was the madrasa a potent symbol of status but it was an effective means of transmitting wealth and status to their descendants. Especially during the Mamlūk period, when only former slaves could assume power, the sons of the ruling Mamlūk elite were unable to inherit. Guaranteed positions within the new madaris thus allowed them to maintain status. Madaris built in this period include the Mosque-Madrasah of Sultan Ḥasan in Cairo.
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eng_Latn
| 133,587 |
When did the first wave of Humanism reach Europe?
|
Renaissance humanism was an intellectual movement in Europe of the later Middle Ages and the Early Modern period. The 19th-century German historian Georg Voigt (1827–91) identified Petrarch as the first Renaissance humanist. Paul Johnson agrees that Petrarch was "the first to put into words the notion that the centuries between the fall of Rome and the present had been the age of Darkness". According to Petrarch, what was needed to remedy this situation was the careful study and imitation of the great classical authors. For Petrarch and Boccaccio, the greatest master was Cicero, whose prose became the model for both learned (Latin) and vernacular (Italian) prose.
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Their endowment by a prince or monarch and their role in training government officials made these Mediterranean universities similar to Islamic madrasas, although madrasas were generally smaller and individual teachers, rather than the madrasa itself, granted the license or degree. Scholars like Arnold H. Green and Hossein Nasr have argued that starting in the 10th century, some medieval Islamic madrasahs became universities. George Makdisi and others, however, argue that the European university has no parallel in the medieval Islamic world. Other scholars regard the university as uniquely European in origin and characteristics.
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eng_Latn
| 133,598 |
In which century did Islamic madrasas start to transform into universities?
|
Their endowment by a prince or monarch and their role in training government officials made these Mediterranean universities similar to Islamic madrasas, although madrasas were generally smaller and individual teachers, rather than the madrasa itself, granted the license or degree. Scholars like Arnold H. Green and Hossein Nasr have argued that starting in the 10th century, some medieval Islamic madrasahs became universities. George Makdisi and others, however, argue that the European university has no parallel in the medieval Islamic world. Other scholars regard the university as uniquely European in origin and characteristics.
|
People of all ages attend, and many often move on to becoming imams.[citation needed] The certificate of an ʻālim, for example, requires approximately twelve years of study.[citation needed] A good number of the ḥuffāẓ (plural of ḥāfiẓ) are the product of the madaris. The madaris also resemble colleges, where people take evening classes and reside in dormitories. An important function of the madaris is to admit orphans and poor children in order to provide them with education and training. Madaris may enroll female students; however, they study separately from the men.[citation needed]
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eng_Latn
| 133,600 |
What are the origins of the word madrasa?
|
Madrasa (Arabic: مدرسة, madrasah, pl. مدارس, madāris, Turkish: Medrese) is the Arabic word for any type of educational institution, whether secular or religious (of any religion). The word is variously transliterated madrasah, madarasaa, medresa, madrassa, madraza, medrese, etc. In the West, the word usually refers to a specific type of religious school or college for the study of the Islamic religion, though this may not be the only subject studied. Not all students in madaris are Muslims; there is also a modern curriculum.
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In 2003, the remains of a mosaic pavement were discovered under the ruins of the Bizere Monastery near the River Mureş in present-day Romania. The panels depict real or fantastic animal, floral, solar and geometric representations. Some archeologists supposed that it was the floor of an Orthodox church, built some time between the 10th and 11th century. Other experts claim that it was part of the later Catholic monastery on the site because it shows the signs of strong Italianate influence. The monastery was situated that time in the territory of the Kingdom of Hungary.
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eng_Latn
| 133,605 |
Mahiat is Arabic for what?
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Following al-Farabi's lead, Avicenna initiated a full-fledged inquiry into the question of being, in which he distinguished between essence (Mahiat) and existence (Wujud). He argued that the fact of existence can not be inferred from or accounted for by the essence of existing things, and that form and matter by themselves cannot interact and originate the movement of the universe or the progressive actualization of existing things. Existence must, therefore, be due to an agent-cause that necessitates, imparts, gives, or adds existence to an essence. To do so, the cause must be an existing thing and coexist with its effect.
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People of all ages attend, and many often move on to becoming imams.[citation needed] The certificate of an ʻālim, for example, requires approximately twelve years of study.[citation needed] A good number of the ḥuffāẓ (plural of ḥāfiẓ) are the product of the madaris. The madaris also resemble colleges, where people take evening classes and reside in dormitories. An important function of the madaris is to admit orphans and poor children in order to provide them with education and training. Madaris may enroll female students; however, they study separately from the men.[citation needed]
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eng_Latn
| 133,650 |
Governments created universities to serve as what?
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The epistemological tensions between scientists and universities were also heightened by the economic realities of research during this time, as individual scientists, associations and universities were vying for limited resources. There was also competition from the formation of new colleges funded by private benefactors and designed to provide free education to the public, or established by local governments to provide a knowledge hungry populace with an alternative to traditional universities. Even when universities supported new scientific endeavors, and the university provided foundational training and authority for the research and conclusions, they could not compete with the resources available through private benefactors.
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People of all ages attend, and many often move on to becoming imams.[citation needed] The certificate of an ʻālim, for example, requires approximately twelve years of study.[citation needed] A good number of the ḥuffāẓ (plural of ḥāfiẓ) are the product of the madaris. The madaris also resemble colleges, where people take evening classes and reside in dormitories. An important function of the madaris is to admit orphans and poor children in order to provide them with education and training. Madaris may enroll female students; however, they study separately from the men.[citation needed]
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eng_Latn
| 133,657 |
What was the original name of Ireland's Institute of Technology system?
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Ireland has an "Institute of Technology" system, formerly referred to as Regional Technical College (RTCs) system. The terms "IT" and "IT's" are now widely used to describe an Institute(s) of Technology. These institutions offer sub-degree, degree and post-graduate level studies. Unlike the Irish university system an Institute of Technology also offers sub-degree programmes such as 2-year Higher Certificate programme in various academic fields of study. Some institutions have "delegated authority" that allows them to make awards in their own name, after authorisation by the Higher Education & Training Awards Council.
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The Arabic term ijāzat al-tadrīs was awarded to Islamic scholars who were qualified to teach. According to Makdisi, the Latin title licentia docendi 'licence to teach' in the European university may have been a translation of the Arabic, but the underlying concept was very different. A significant difference between the ijāzat al-tadrīs and the licentia docendi was that the former was awarded by the individual scholar-teacher, while the latter was awarded by the chief official of the university, who represented the collective faculty, rather than the individual scholar-teacher.
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eng_Latn
| 133,674 |
what is muktab mean
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KuttÄb means writers, plural katatÄ«b / katÄtÄ«b. In common Modern Arabic usage, maktab means office while maktabah means library or (place of) study and kuttÄb is a plural word meaning books.n the medieval Islamic world, an elementary school was known as a maktab, which dates back to at least the 10th century. Like madrasahs (which referred to higher education), a maktab was often attached to a mosque.
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Maktab is used in Dari Persian in Afghanistan as an equivalent term to school, including both primary and secondary schools.n the medieval Islamic world, an elementary school was known as a maktab, which dates back to at least the 10th century. Like madrasahs (which referred to higher education), a maktab was often attached to a mosque.
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eng_Latn
| 133,692 |
Testing for a Trend in a Partially Incomplete Hurricane Record
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Abstract The record of annual counts of basinwide North Atlantic hurricanes is incomplete prior to 1946. This has restricted efforts to identify a long-term trend in hurricane activity to the postwar period. In contrast, the complete record of U.S. landfalling hurricanes extends back to 1930 or earlier. Under the assumption that the proportion of basinwide hurricanes that make landfall is constant over time, it is possible to use the record of landfalling hurricanes to extend a test for trend in basinwide hurricane activity beyond the postwar period. This note describes and illustrates a method for doing this. The results suggest that there has been a significant reduction in basinwide hurricane activity over the period 1930–98.
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The purpose of this study is to investigate the relationship between clothing behaviors, background and popularity for a group of junior-high school girls in seoul, Korea. background : father's education, type of housing and economic level. popularity : Sociometric test. For statistical analyses of the data from 446 respondents, F-test, t-test, -test, M. and S.D. were used. The findings were as follows : 1. (1) Father's education correlated significantly with Awarenessat psatisfaction at Pconformity-at psatisfaction at pconformity at psatisfaction at p
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eng_Latn
| 133,695 |
La elección de fuentes de apoyo social entre inmigrantes
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Choice of social support sources among immigrants. Based on the social convoy model (Khan & Antonucci, 1980), this study examines the choice of social support sources among immigrants through Manhein Interview (Veil, 1990). 150 well-fare facility recipients from Morocco and Philippines took part voluntarily. Log-linear analysis (SPSS.9) were employed to process data. The models obtained showed how nationality, family status and length of stay influenced participant's choices. Nevertheless, these direct effects were modulated by the types of demands. Generally, immigrants tended to chose kin and sometimes friends, particularly for psychological daily needs. Results from this study supported the application of the social convoy model to the analysis of immigrant's social support system.
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Using an original dataset which is derived from a content analysis of local television news broadcasts and political advertisements within a single American market during the entire 2008 election cycle, this paper analyzes the substantive differences between political content provided to viewers in Spanish versus English language news programs. Political and electoral implications are discussed.
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spa_Latn
| 133,713 |
Evaluative Affect Display Toward Male and Female Leaders of Task-Oriented Groups:
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A laboratory study and a field study (N = 168) investigated evaluative affect display (EAD), that is nonverbal evaluative reactions, toward leaders in small, face-to-face groups. Butler and Geis had found that female leaders received more negative affect than did male leaders, whereas both groups were judged equally competent on rating scales. Study 1 replicated their findings with a more economic coding method and improved methodological control. Study 2 examined EAD in routine meetings of real teams in different organizational field settings. Results suggest that EAD is a reliably observable phenomenon in field and laboratory settings. Generally, more negative affect was displayed toward female leaders across contexts. By contrast, there was no preference for men over women in competence ratings on scales.
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This paper empirically investigates whether the quantity deficit in the children of the mother’s preferred gender is compensated through their favorable treatment in terms of investment in schooling (what we call a compensating hypothesis) in an environment where schooling opportunities are limited. We use data from siblings in two rounds of the demographic and health surveys of Ethiopia for empirical analysis. Using the gender ratio of the mother’s own siblings and the birth of same sex twins as instruments for gender ratio gap, we estimate binary choice models with clustering for school attendance using generalized instrumental variable techniques with interactive instruments. Our empirical evidence appears to be consistent with the compensating hypothesis that the larger the excess of actual proportion of girls over the mother’s desired proportion, the smaller a girl’s chance of attending school and the bigger a boy’s chance of attending school will be.
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eng_Latn
| 133,715 |
A Study of the Growth of American Families
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Field work has been completed for a national sample study of the growth of American families. Its objectives are: (1) to study expectations of size of family as one basis for better forecasts of births; (2) to describe differences in fertility behavior for major population strata; and (3) to test the relationship of basic social variables to fertility behavior. A national probability sample of white married women in the childbearing years has been interviewed and field work has been completed. The response rate was high.
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In 1899 Thorstein Veblen wrote a seminal monograph on the subject of consumption and leisure. ::: His work, The Theory of the Leisure Class, is one of the most enduring examples of status-seeking ::: individuals� conspicuous consumption and conspicuous leisure practices, particularly when applied ::: to the tourist industry, and furthermore, is still relevant in today�s economic climate. This article ::: develops an independent theory of backpackers and how they can be perceived as undertaking ::: conspicuous consumption and conspicuous leisure practices. This is done using Veblen�s work as ::: a foundation. Qualitative methods using in-depth interviews and participant observation techniques ::: are employed to obtain data from 41 participants. The findings serve to highlight the fact that ::: Veblen�s thesis is as relevant today as it was when it was written in 1899.
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eng_Latn
| 133,719 |
Gender differences in leisure-need activity patterns
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A gender-by-leisure choice model predicting four different leisure-choice-by-need patterns, based on gender restricted or unrestricted choice by same or different needs, is described and tested. Assessment of leisure-choice-by-need patterns was made by determining the relevance of a set of 13 need attributes for 16 different leisure activities. Gender differences in need attributes for each activity were identified using stepwise discriminant analysis. Results revealed significant discriminations for 12 of the 16 activities. Analyses further indicated that somewhat different clusters of need attributes were associated with each activity. Results provided tentative support for the proposed model, suggesting that participation in some activities is related to the same needs for males and females, while participation in other activities is related to different needs.
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With the combination of documentary analysis,experiment,statistics analysis and other methods,this thesis do some research and analysis on college students’ mental health and society adapt-ability,aiming at investigate in the physical education Group Calisthenics’ influence on college students’ mental health and society adapt-ability.The study adopts UPI Questionnaire and Society Adapt-ability diagnosis as the test standard.The result of research reflects that Group Calisthenics teaching is beneficial to promote the college students’ mental health and society adapt-ability.
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eng_Latn
| 133,720 |
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