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711.3308
EDA Publishing Association
Yasser Ammar (TIMA), S. Basrour (TIMA)
Non Linear Techniques for Increasing Harvesting Energy from Piezoelectric and Electromagnetic Micro-Power-Generators
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Non-linear techniques are used to optimize the harvested energy from piezoelectric and electromagnetic generators. This paper introduces an analytical study for the voltage amplification obtained from these techniques. The analytical study is experimentally validated using a macro model of piezoelectric generator. Moreover, the integration influences on these techniques is studied. Through all the obtained results, a suitable structure for autonomous microsystems is proposed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:53:26 GMT" } ]
2007-11-29T00:00:00
[ [ "Ammar", "Yasser", "", "TIMA" ], [ "Basrour", "S.", "", "TIMA" ] ]
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711.3309
EDA Publishing Association
E. Lefeuvre (LGEF), A. Badel (LGEF), C. Richard (LGEF), L. Petit (LGEF), D. Guyomar (LGEF)
Optimization of Piezoelectric Electrical Generators Powered by Random Vibrations
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper compares the performances of a vibrationpowered electrical generators using PZT piezoelectric ceramic associated to two different power conditioning circuits. A new approach of the piezoelectric power conversion based on a nonlinear voltage processing is presented and implemented with a particular power conditioning circuit topology. Theoretical predictions and experimental results show that the nonlinear processing technique may increase the power harvested by a factor up to 4 compared to the Standard optimization technique. Properties of this new technique are analyzed in particular in the case of broadband, random vibrations, and compared to those of the Standard interface.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:54:47 GMT" } ]
2007-11-29T00:00:00
[ [ "Lefeuvre", "E.", "", "LGEF" ], [ "Badel", "A.", "", "LGEF" ], [ "Richard", "C.", "", "LGEF" ], [ "Petit", "L.", "", "LGEF" ], [ "Guyomar", "D.", "", "LGEF" ] ]
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711.331
Pedro Beir\~ao
P. Beir\~ao, B. R. Brandl, P. N. Appleton, B. Groves, L. Armus, N. M. F\"orster Schreiber, J. D. Smith, V. Charmandaris, J. R. Houck
Spatially Resolved Spitzer-IRS Spectroscopy of the Central Region of M82
15 pages, 12 figures, 3 tables, ApJ, emulateapj
null
10.1086/527343
null
astro-ph
null
We present high spatial resolution (~ 35 parsec) 5-38 um spectra of the central region of M82, taken with the Spitzer Infrared Spectrograph. From these spectra we determined the fluxes and equivalent widths of key diagnostic features, such as the [NeII]12.8um, [NeIII]15.5um, and H_2 S(1)17.03um lines, and the broad mid-IR polycyclic aromatic hydrocarbon (PAH) emission features in six representative regions and analysed the spatial distribution of these lines and their ratios across the central region. We find a good correlation of the dust extinction with the CO 1-0 emission. The PAH emission follows closely the ionization structure along the galactic disk. The observed variations of the diagnostic PAH ratios across M82 can be explained by extinction effects, within systematic uncertainties. The 16-18um PAH complex is very prominent, and its equivalent width is enhanced outwards from the galactic plane. We interpret this as a consequence of the variation of the UV radiation field. The EWs of the 11.3um PAH feature and the H_2 S(1) line correlate closely, and we conclude that shocks in the outflow regions have no measurable influence on the H_2 emission. The [NeIII]/[NeII] ratio is on average low at ~0.18, and shows little variations across the plane, indicating that the dominant stellar population is evolved (5 - 6 Myr) and well distributed. There is a slight increase of the ratio with distance from the galactic plane of M82 which we attribute to a decrease in gas density. Our observations indicate that the star formation rate has decreased significantly in the last 5 Myr. The quantities of dust and molecular gas in the central area of the galaxy argue against starvation and for negative feedback processes, observable through the strong extra-planar outflows.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:50:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Beirão", "P.", "" ], [ "Brandl", "B. R.", "" ], [ "Appleton", "P. N.", "" ], [ "Groves", "B.", "" ], [ "Armus", "L.", "" ], [ "Schreiber", "N. M. Förster", "" ], [ "Smith", "J. D.", "" ], [ "Charmandaris", "V.", "" ], [ "Houck", "J. R.", "" ] ]
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711.3311
EDA Publishing Association
P.-D. Mitcheson, T.-C. Green, E.-M. Yeatman
Power Processing Circuits for Mems Inertial Energy Scavengers
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Inertial energy scavengers are self-contained devices which generate power from ambient motion, by electrically damping the internal motion of a suspended proof mass. There are significant challenges in converting the power generated from such devices to useable form, particularly in micro-engineered variants. This paper presents approaches to this power conversion requirement, with emphasis on the cases of electromagnetic and electrostatic transduction.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:57:09 GMT" } ]
2007-11-29T00:00:00
[ [ "Mitcheson", "P. -D.", "" ], [ "Green", "T. -C.", "" ], [ "Yeatman", "E. -M.", "" ] ]
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711.3312
EDA Publishing Association
T. Sterken, P. Fiorini, R. Puers
Motion-Based Generators for Industrial Applications
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Scaling down of electronic systems has generated a large interest in the research on miniature energy sources. In this paper a closer look is given to the use of vibration based scavengers in industrial environments, where waste energy is abundantly available as engine related vibrations or large amplitude motions. The modeling of mechanical generators resulted in the design and realization of two prototypes, based on electromagnetic and electrostatic conversion of energy. Although the prototypes are not yet optimized against size and efficiency, a power of 0.3 mW has been generated in a 5 Hz motion with a 0.5 meter amplitude.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:57:46 GMT" } ]
2007-11-29T00:00:00
[ [ "Sterken", "T.", "" ], [ "Fiorini", "P.", "" ], [ "Puers", "R.", "" ] ]
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711.3313
EDA Publishing Association
Yi Chiu, Chiung-Ting Kuo, Yu-Shan Chu
Design and Fabrication of a Micro Electrostatic Vibration-to-Electricity Energy Converter
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents a micro electrostatic vibration-toelectricity energy converter. For the 3.3 V supply voltage and 1cm2 chip area constraints, optimal design parameters were found from theoretical calculation and Simulink simulation. In the current design, the output power is 200 $\mu$W/cm2 for the optimal load of 8 M\Omega. The device was fabricated in a silicon-on-insulator (SOI) wafer. Mechanical and electrical measurements were conducted. Residual particles caused shortage of the variable capacitor and the output power could not be measured. Device design and fabrication processes are being refined.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:58:42 GMT" } ]
2007-11-29T00:00:00
[ [ "Chiu", "Yi", "" ], [ "Kuo", "Chiung-Ting", "" ], [ "Chu", "Yu-Shan", "" ] ]
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711.3314
EDA Publishing Association
S.-P. Beeby, M.-J. Tudor, R.-N. Torah, E. Koukharenko, S. Roberts, T. O'Donnell, S. Roy
Macro and Micro Scale Electromagnetic Kinetic Energy Harvesting Generators
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper is concerned with generators that harvest electrical energy from the kinetic energy present in the sensor nodes environment. These generators have the potential to replace or augment battery power which has a limited lifetime and requires periodic replacement which limits the placement and application of the sensor node.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:01:56 GMT" } ]
2007-11-29T00:00:00
[ [ "Beeby", "S. -P.", "" ], [ "Tudor", "M. -J.", "" ], [ "Torah", "R. -N.", "" ], [ "Koukharenko", "E.", "" ], [ "Roberts", "S.", "" ], [ "O'Donnell", "T.", "" ], [ "Roy", "S.", "" ] ]
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711.3315
EDA Publishing Association
Fei Duan, J. Jiao, Y. Wang
Impact of Thermal Behavior on Offset in a High-Q Gyroscope
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
In this paper, CFD approach is used to simulate the thermal behavior in a sensitive high-Q gyroscope. The electromagnetically driving wires, in which AC current flows, are treated as Joule heat sources in the model. We found that the differences of temperature, pressure and velocity along the driving direction and transversely across the proof masses increased as the gap height between the proof mass and top glass became smaller. Local pressure gradient is expected to possibly enhance the impact of any imperfect led by MEMS processes or designs on the offset of our tuning fork type gyroscope, which has been experimentally verified. A device with 200um gap gives a two-third offset down compared with that of its counterpart with 50um gap.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:02:53 GMT" } ]
2007-11-29T00:00:00
[ [ "Duan", "Fei", "" ], [ "Jiao", "J.", "" ], [ "Wang", "Y.", "" ] ]
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711.3316
EDA Publishing Association
T. O'Donnell, C. Saha, S.-P. Beeby, M.-J. Tudor
Scaling Effects for Electromagnetic Vibrational Power Generators
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper investigates how the power generated by electromagnetic based vibrational power generators scales with the dimension of the generator. The effects of scaling on the magnetic fields, the coil parameters and the electromagnetic damping are presented. An analysis is presented for both wire-wound coil technology and micro-fabricated coils.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:03:04 GMT" } ]
2007-11-29T00:00:00
[ [ "O'Donnell", "T.", "" ], [ "Saha", "C.", "" ], [ "Beeby", "S. -P.", "" ], [ "Tudor", "M. -J.", "" ] ]
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711.3317
EDA Publishing Association
R. Hellin-Rico, J.-P. Celis, K. Baert, C. Van Hoof, A. Witvrouw
A Generic Surface Micromachining Module for Mems Hermetic Packaging at Temperatures Below 200 degrees C
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents the different processing steps of a new generic surface micromachining module for MEMS hermetic packaging at temperatures around 180 degrees C based on nickel plating and photoresist sacrificial layers. The advantages of thin film caps are the reduced thickness and area consumption and the promise of being a low-cost batch process. Moreover, sealing happens by a reflow technique, giving the freedom of choosing the pressure and atmosphere inside the cavity. Sacrificial etch holes are situated above the device allowing shorter release times compared to the state-of-the-art. With the so-called over-plating process, small etch holes can be created in the membrane without the need of expensive lithography tools. The etch holes in the membrane have been shown to be sufficiently small to block the sealing material to pass through, but still large enough to enable an efficient release.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:03:52 GMT" } ]
2007-11-29T00:00:00
[ [ "Hellin-Rico", "R.", "" ], [ "Celis", "J. -P.", "" ], [ "Baert", "K.", "" ], [ "Van Hoof", "C.", "" ], [ "Witvrouw", "A.", "" ] ]
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711.3318
EDA Publishing Association
Zhang Yong, Zhu Jian, Yu Yuanwei, Chen Chen, Jia Shi Xing
A Ku-Band Novel Micromachined Bandpass Filter with Two Transmission Zeros
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents a micromachined bandpass filter with miniature size that has relatively outstanding performance. A silicon-based eight-order microstrip bandpass filter is fabricated and measured. A novel design method of the interdigital filter that can create two transmission zeros is described. The location of the transmission zeros can be shifted arbitrarily in the stopband. By adjusting the zero location properly, the filter provides much better skirt rejection and lower insertion loss than a conventional microstrip interdigital filter. To reduce the chip size, through-silicon-substrate-via-hole is used. Good experimental results are obtained.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:05:09 GMT" } ]
2007-11-29T00:00:00
[ [ "Yong", "Zhang", "" ], [ "Jian", "Zhu", "" ], [ "Yuanwei", "Yu", "" ], [ "Chen", "Chen", "" ], [ "Xing", "Jia Shi", "" ] ]
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711.3319
EDA Publishing Association
Ch.-Heng Chien, Hui-Min Yu
The Design and Fabrication of Platform Device for Dna Amplification
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Thermalcycler were extensively used machine for amplify DNA sample. One of the major problems in the working time was that it spent most of time for cooling and heating. In order to improve the efficient, this study presented a novel method for amplify DNA sample. For this concept, the DNA sample in the silicon chamber which was pushed by a beam through three temperature regions around a center and then the DNA segments could be amplified rapidly after 30 cycles. The polymerase chain reaction platform was composed of thin-film heaters, copper plates, DC powers, and temperature controllers. The photolithography and bulk etching technologies were utilized to construct the thin-film heater and DNA reaction chambers. Finally, 1 pound gL 100bp DNA segment of E. coli K12 was amplified successfully within 36 minutes on this PCR platform.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:05:29 GMT" } ]
2007-11-29T00:00:00
[ [ "Chien", "Ch. -Heng", "" ], [ "Yu", "Hui-Min", "" ] ]
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711.332
EDA Publishing Association
Hsien-Tsung Chang, Chia-Yen Lee, Chih-Yung Wen
Design and Modeling of a Mems-Based Valveless Pump Driven by an Electromagnetic Force
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
A novel valveless micro impedance pump is proposed and analyzed in this study.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:05:58 GMT" } ]
2007-11-29T00:00:00
[ [ "Chang", "Hsien-Tsung", "" ], [ "Lee", "Chia-Yen", "" ], [ "Wen", "Chih-Yung", "" ] ]
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711.3321
EDA Publishing Association
A.-S. Rollier (IEMN), M. Faucher (IEMN), B. Legrand (IEMN), D. Collard (IEMN), L. Buchaillot (IEMN)
Electrostatic Actuators Operating in Liquid Environment : Suppression of Pull-in Instability and Dynamic Response
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents results about fabrication and operation of electrostatic actuators in liquids with various permittivities. In the static mode, we provide experimental and theoretical demonstration that the pull-in effect can be shifted beyond one third of the initial gap and even be eliminated when electrostatic actuators are operated in liquids. This should benefit to applications in microfluidics requiring either binary state actuation (e.g. pumps, valves) or continuous displacements over the whole gap (e.g. microtweezers). In dynamic mode, actuators like micro-cantilevers present a great interest for Atomic Force Microscopy (AFM) in liquids. As this application requires a good understanding of the cantilever resonance frequency and Q-factor, an analytical modeling in liquid environment has been established. The theoretically derived curves are validated by experimental results using a nitride encapsulated cantilever with integrated electrostatic actuation. Electrode potential screening and undesirable electrochemistry in dielectric liquids are counteracted using AC-voltages. Both experimental and theoretical results should prove useful in micro-cantilever design for AFM in liquids.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:08:07 GMT" } ]
2007-11-29T00:00:00
[ [ "Rollier", "A. -S.", "", "IEMN" ], [ "Faucher", "M.", "", "IEMN" ], [ "Legrand", "B.", "", "IEMN" ], [ "Collard", "D.", "", "IEMN" ], [ "Buchaillot", "L.", "", "IEMN" ] ]
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711.3322
Katia Biazzo Dr
A. Frasca (1), K. Biazzo (1), G. Tas (2), S. Evren (2), A. C. Lanzafame (3) ((1) INAF - Catania Astrophysical Observatory, Catania, Italy, (2) Ege University Observatory, Bornova, Izmir, Turkey, (3) Department of Physics and Astronomy, Astrophysics Section, University of Catania, Italy)
Spots, plages, and flares on lambda Andromedae and II Pegasi
Accepted for publication in A&A (7 November 2007) 12 Pages, 7 Figures
null
10.1051/0004-6361:20077915
null
astro-ph
null
We present the results of a contemporaneous photometric and spectroscopic monitoring of lambda And and II Peg aimed at investigating the behavior of surface inhomogeneities in the atmospheres of these active stars which have nearly the same temperature but different gravity. The light curves and the modulation of the surface temperature, as recovered from LDRs, are used to map the photospheric spots, while the H-alpha emission has been used as an indicator of chromospheric inhomogeneities. The spot temperatures and sizes were derived from a spot model applied to the contemporaneous light and temperature curves. We find larger and cooler spots on II Peg (T_sp ~ 3600 K) compared to lambda And (T_sp ~ 3900 K); this could be the result of both the different gravity and the higher activity level of the former. Moreover, we find a clear anti-correlation between the H-alpha emission and the photospheric diagnostics. We have also detected a modulation of the intensity of the HeI D_3 line with the star rotation. A rough reconstruction of the 3D structure of their atmospheres has been also performed by applying a spot/plage model to the light and temperature curves and to the H-alpha flux modulation. A close spatial association of photospheric and chromospheric active regions has been found in both stars. Larger and cooler spots have been found on II Peg, the system with the active component of higher gravity and higher activity level. The area ratio of plages to spots seems to decrease when the spots get bigger. Moreover, with the present and literature data, a correlation between the temperature difference Delta_T = T_ph - T_sp and the surface gravity has been also suggested. In addition, a strong flare affecting the H-alpha, the HeI D_3, and the cores of NaI D_1,2 lines has been observed on II Peg.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:08:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Frasca", "A.", "" ], [ "Biazzo", "K.", "" ], [ "Tas", "G.", "" ], [ "Evren", "S.", "" ], [ "Lanzafame", "A. C.", "" ] ]
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711.3323
EDA Publishing Association
Jeong-Won Yoon, H.-S. Chun, Ja-Myeong Koo, Seung-Boo Jung
Au-SN Flip-Chip Solder Bump for Microelectronic and Optoelectronic Applications
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
As an alternative to the time-consuming solder pre-forms and pastes currently used, a co-electroplating method of eutectic Au-Sn alloy was used in this study. Using a co-electroplating process, it was possible to plate the Au-Sn solder directly onto a wafer at or near the eutectic composition from a single solution. Two distinct phases, Au5Sn and AuSn, were deposited at a composition of 30at.%Sn. The Au-Sn flip-chip joints were formed at 300 and 400 degrees without using any flux. In the case where the samples were reflowed at 300 degrees, only an (Au,Ni)3Sn2 IMC layer formed at the interface between the Au-Sn solder and Ni UBM. On the other hand, two IMC layers, (Au,Ni)3Sn2 and (Au,Ni)3Sn, were found at the interfaces of the samples reflowed at 400 degrees. As the reflow time increased, the thickness of the (Au,Ni)3Sn2 and (Au,Ni)3Sn IMC layers formed at the interface increased and the eutectic lamellae in the bulk solder coarsened.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:08:21 GMT" } ]
2007-11-29T00:00:00
[ [ "Yoon", "Jeong-Won", "" ], [ "Chun", "H. -S.", "" ], [ "Koo", "Ja-Myeong", "" ], [ "Jung", "Seung-Boo", "" ] ]
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711.3324
EDA Publishing Association
Gy. Bognar, V. Szekely, M. Rencz
Contactless Thermal Characterization Method of PCB-s Using an IR Sensor Array
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
In this paper the feasibility study of an IR sensor card is presented. The methodology and the results of a quasi real-time thermal characterization tool and method for the temperature mapping of circuits and boards based on sensing the infrared radiation is introduced. With the proposed method the IR radiation-distribution of boards from the close proximity of the sensor card is monitored in quasi real-time. The proposed method is enabling in situ IR measurement among operating cards of a system e.g. in a rack.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:09:20 GMT" } ]
2007-11-29T00:00:00
[ [ "Bognar", "Gy.", "" ], [ "Szekely", "V.", "" ], [ "Rencz", "M.", "" ] ]
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711.3325
EDA Publishing Association
Hsiharng Yang, Chung-Tze Lee
Miniaturized Fluorescence Excitation Platform with Optical Fiber for Bio-Detection Chips
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents a new research study on the platform fabrication of fluorescence bio-detection chip with an optical fiber transmission. Anisotropic wet etching on (100) silicon wafers to fabrication V-groove for optical fiber alignment and micro-mirror were included. Combing with anodic bonding technique to adhere glass, silicon structure and optical fiber for a fluorescence excitation platform was completed. In this study, the etching solution 40% KOH was used to study the parameters effect. The results show that working temperature is the main parameter to significantly effect the etch rate. The anisotropic etching resulted 54.7 degrees reflective mirrors and its reflectivity for optical beam were also examined. The surface roughness of the micro-mirror is Ra 4.1 nm measured using AFM, it provides excellent optical reflection. The incident light and beam profiles were also examined for further study. This study can show this micro-platform adaptable for fluorescence bio-detection.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:09:35 GMT" } ]
2007-11-29T00:00:00
[ [ "Yang", "Hsiharng", "" ], [ "Lee", "Chung-Tze", "" ] ]
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711.3326
EDA Publishing Association
M. Woytasik (IEF), J.-C. Ginefri (U2R2M), J.-S. Raynaud, M. Poirier-Quinot (U2R2M), E. Dufour-Gergam (IEF), J.-P. Grandchamp (IEF), L. Darrasse (U2R2M), P. Robert, J.-P. Gilles (IEF), E. Martincic (IEF), O. Girard (U2R2M)
Characterization of Flexible RF Microcoil Dedicated to Surface Mri
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
In Magnetic Resonance Imaging (MRI), to achieve sufficient Signal to Noise Ratio (SNR), the electrical performance of the RF coil is critical. We developed a device (microcoil) based on the original concept of monolithic resonator. This paper presents the used fabrication process based on micromoulding. The dielectric substrates are flexible thin films of polymer, which allow the microcoil to be form fitted to none-plane surface. Electrical characterizations of the RF coils are first performed and results are compared to the attempted values. Proton MRI of a saline phantom using a flexible RF coil of 15 mm in diameter is performed. When the coil is conformed to the phantom surface, a SNR gain up to 2 is achieved as compared to identical but planar RF coil. Finally, the flexible coil is used in vivo to perform MRI with high spatial resolution on a mouse using a small animal dedicated scanner operating at in a 2.35 T.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:10:21 GMT" } ]
2007-11-29T00:00:00
[ [ "Woytasik", "M.", "", "IEF" ], [ "Ginefri", "J. -C.", "", "U2R2M" ], [ "Raynaud", "J. -S.", "", "U2R2M" ], [ "Poirier-Quinot", "M.", "", "U2R2M" ], [ "Dufour-Gergam", "E.", "", "IEF" ], [ "Grandchamp", "J. -P.", "", "IEF" ], [ "Darrasse", "L.", "", "U2R2M" ], [ "Robert", "P.", "", "IEF" ], [ "Gilles", "J. -P.", "", "IEF" ], [ "Martincic", "E.", "", "IEF" ], [ "Girard", "O.", "", "U2R2M" ] ]
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711.3327
EDA Publishing Association
D. Bouyge (XLIM), D. Sabourdy (XLIM), A. Crunteanu (XLIM), P. Blondy (XLIM), V. Couderc (XLIM), J. Lhermite (XLIM), L. Grossard (XLIM), A. Barth\'elemy (XLIM)
Integration of Micro-Electro-Mechanical Deformable Mirrors in Doped Fiber Amplifiers
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
We present a simple technique to produce active Q-switching in various types of fiber amplifiers by active integration of an electrostatic actuated deformable metallic micro-mirror. The optical MEMS (MOEMS) device acts as one of the laser cavity reflectors and, at the same time, as switching/ modulator element. We aim to obtain laser systems emitting short, high-power pulses and having variable repetition rate. The electro-mechanical behavior of membrane (bridge-type) was simulated by using electrostatic and modal 3D finite element analysis (FEA). The results of the simulations fit well with the experimental mechanical, electrical and thermal measurements of the components. In order to decrease the sensitiveness to fiber-mirror alignment we are developing novel optical devices based on stressed-metal cantilever-type geometry that allow deflections up to 50 $\mu$m with increased reflectivity discrimination during actuation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:13:26 GMT" } ]
2007-11-29T00:00:00
[ [ "Bouyge", "D.", "", "XLIM" ], [ "Sabourdy", "D.", "", "XLIM" ], [ "Crunteanu", "A.", "", "XLIM" ], [ "Blondy", "P.", "", "XLIM" ], [ "Couderc", "V.", "", "XLIM" ], [ "Lhermite", "J.", "", "XLIM" ], [ "Grossard", "L.", "", "XLIM" ], [ "Barthélemy", "A.", "", "XLIM" ] ]
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711.3328
Thomas Schick
Peter Linnell (Virginia Tech), Thomas Schick (Georg-August-Universitaet Goettingen)
The Atiyah conjecture and Artinian rings
10 pages, submitted to the proceedings of the Morelia conference in honor of Farrell-Jones
Pure and Applied Mathematics Quarterly 8 (2012), no. 2, 313--328
10.4310/PAMQ.2012.v8.n2.a1
null
math.RA math.KT math.OA
null
Let G be a group such that its finite subgroups have bounded order, let d denote the lowest common multiple of the orders of the finite subgroups of G, and let K be a subfield of C that is closed under complex conjugation. Let U(G) denote the algebra of unbounded operators affiliated to the group von Neumann algebra N(G), and let D(KG,U(G)) denote the division closure of KG in U(G); thus D(KG,U(G)) is the smallest subring of U(G) containing KG that is closed under taking inverses. Suppose n is a positive integer, and \alpha \in \Mat_n(KG). Then \alpha induces a bounded linear map \alpha: l^2(G)^n \to \l^2(G)^n, and \ker\alpha has a well-defined von Neumann dimension \dim_{N(G)} (\ker\alpha). This is a nonnegative real number, and one version of the Atiyah conjecture states that d \dim_{N(G)}(\ker\alpha) \in Z. Assuming this conjecture, we shall prove that if G has no nontrivial finite normal subgroup, then D(KG,U(G)) is a d \times d matrix ring over a skew field. We shall also consider the case when G has a nontrivial finite normal subgroup, and other subrings of U(G) that contain KG.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:31:33 GMT" } ]
2018-11-28T00:00:00
[ [ "Linnell", "Peter", "", "Virginia Tech" ], [ "Schick", "Thomas", "", "Georg-August-Universitaet Goettingen" ] ]
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711.3329
EDA Publishing Association
Ruey-Fang Shyu, Hsiharng Yang, Wen-Ren Tsai, Jhy-Cherng Tsai
Micro-Ball Lens Array Fabrication in Photoresist Using Ptfe Hydrophobic Effect
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
This paper presents a simple method to fabricate micro-ball lens and its array. The key technology is to use the hydrophobic characteristics of polyterafluoroethylene (PTFE) substrate. High contact angle between melted photoresist pattern and PTFE can generate micro-ball lens and its array. PTFE thin film was spun onto a silicon wafer and dried in oven. Photoresist AZ4620 was used to pattern micro-columns with different diameters 60, 70 and 80 $\mu$m. A thermal reflow process then was applied to melt these micro-column patterns resulted in micro-ball lens array. The achieved micro-ball lens array with diameter 98 $\mu$m was fabricated using 80 $\mu$m in diameter patterns. This method provides a simple fabrication process and low material cost.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:17:24 GMT" } ]
2007-11-29T00:00:00
[ [ "Shyu", "Ruey-Fang", "" ], [ "Yang", "Hsiharng", "" ], [ "Tsai", "Wen-Ren", "" ], [ "Tsai", "Jhy-Cherng", "" ] ]
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711.333
EDA Publishing Association
A. Molfese, A. Nannini, F. Pieri
Reduced-Order Modelling of the Bending of an Array of Torsional Micromirrors
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Reduced-Order Modelling of the Bending of an Array of An array of micromirrors for beam steering optical switching has been designed in a thick polysilicon technology. A novel semi-analytical method to calculate the static characteristics of the micromirrors by taking into account the flexural deformation of the structure is presented. The results are compared with 3D coupled-field FEM simulation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:19:26 GMT" } ]
2007-11-29T00:00:00
[ [ "Molfese", "A.", "" ], [ "Nannini", "A.", "" ], [ "Pieri", "F.", "" ] ]
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711.3331
EDA Publishing Association
V. Rochus, J.-C. Golinval, C. Louis, C. Mendez, I. Klapka
Model of Electrostatic Actuated Deformable Mirror Using Strongly Coupled Electro-Mechanical Finite Element
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
The aim of this paper is to deal with multi-physics simulation of micro-electro-mechanical systems (MEMS) based on an advanced numerical methodology. MEMS are very small devices in which electric as well as mechanical and fluid phenomena appear and interact. Because of their microscopic scale, strong coupling effects arise between the different physical fields, and some forces, which were negligible at macroscopic scale, have to be taken into account. In order to accurately design such micro-electro-mechanical systems, it is of primary importance to be able to handle the strong coupling between the electric and the mechanical fields. In this paper, the finite element method (FEM) is used to model the strong coupled electro-mechanical interactions and to perform static and transient analyses taking into account large mesh displacements. These analyses will be used to study the behaviour of electrostatically actuated micro-mirrors.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:20:15 GMT" } ]
2007-11-29T00:00:00
[ [ "Rochus", "V.", "" ], [ "Golinval", "J. -C.", "" ], [ "Louis", "C.", "" ], [ "Mendez", "C.", "" ], [ "Klapka", "I.", "" ] ]
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711.3332
EDA Publishing Association
D. Fabr\`egue, Nicolas Andr\'e, T. Pardoen, J.P. Raskin
New Internal Stress Driven on-Chip Micromachines for Extracting Mechanical Properties of Thin Films
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
A new concept of micromachines has been developed for measuring the mechanical properties of thin metallic films. The actuator is a beam undergoing large internal stresses built up during the deposition process. Al thin films are deposited partly on the actuator beam and on the substrate. By etching the structure, the actuator contracts and pulls the Al film. Full stress strain curves can be generated by designing a set of micromachines with various actuator lengths. In the present study, the displacements have been measured by scanning electronic microscopy. The stress is derived from simple continuum mechanics relationships. The tensile properties of Al films of various thicknesses have been tested. A marked increase of the strength with decreasing film thickness is observed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:21:30 GMT" } ]
2007-11-29T00:00:00
[ [ "Fabrègue", "D.", "" ], [ "André", "Nicolas", "" ], [ "Pardoen", "T.", "" ], [ "Raskin", "J. P.", "" ] ]
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711.3333
EDA Publishing Association
S.-H. Ng, Z.-F. Wang, R.-T. Tjeung, N. De Rooij
Process Issues for a Multi-Layer Microelectrofluidic Platform
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
We report on the development of some process capabilities for a polymer-based, multi-layer microelectrofluidic platform, namely: the hot embossing process, metallization on polymer and polymer bonding. Hot embossing experiments were conducted to look at the effects of load applied, embossing temperature and embossing time on the fidelity of line arrays representing micro channels. The results revealed that the embossing temperature is a more sensitive parameter than the others due to its large effect on the polymer material's viscoelastic properties. Dynamic mechanical analysis (DMA) on polymethyl methacrylate (PMMA) revealed a steep glass transition over a 20 oC range, with the material losing more than 95 % of its storage modulus. The data explained the hot embossing results which showed large change in the embossed channel dimensions when the temperature is within the glass transition range. It was demonstrated that the micro-printing of silver epoxy is a possible low-cost technique in the mass production of disposable lab chips. An interconnecting network of electrical traces was fabricated in the form of a four-layer PMMA-based device. A four PMMA layer device with interconnecting microfluidic channels was also fabricated and tested.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:23:50 GMT" } ]
2007-11-29T00:00:00
[ [ "Ng", "S. -H.", "" ], [ "Wang", "Z. -F.", "" ], [ "Tjeung", "R. -T.", "" ], [ "De Rooij", "N.", "" ] ]
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711.3334
EDA Publishing Association
Chao-Heng Chien, Hui-Min Yu
Fabrication of Switches on Polymer-Based by Hot Embossing
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
In MEMS technology, most of the devices are fabricated on glass or silicon substrate. However, this research presents a novel manufacture method that is derived from conventional hot embossing technology to fabricate the electrostatic switches on polymer material. The procedures of fabrication involve the metal deposition, photolithography, electroplating, hot embossing and hot embed techniques. The fundamental concept of the hot embed technology is that the temperature should be increased above Tg of polymer, and the polymer becomes plastic and viscous and could be molded. According to the fundamental concept, the metal layer on the silicon/glass substrate could be embedded into polymer material during the hot embossing process. Afterward, the metal layer is bonded together with the polymer after removing the substrate in the de-embossing step. Finally, the electrostatic switch is fabricated on polymethylmethacrylate(PMMA) material to demonstrate the novel method.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:27:32 GMT" } ]
2007-11-29T00:00:00
[ [ "Chien", "Chao-Heng", "" ], [ "Yu", "Hui-Min", "" ] ]
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711.3335
EDA Publishing Association
M. Hosseini, G. Zhu, Y.-A. Peter
A New Model of Fringing Capacitance and its Application to the Control of Parallel-Plate Electrostatic Micro Actuators
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS - DTIP 2006, Stresa, Lago Maggiore : Italie (2006)
null
null
cs.OH
null
Fringing field has to be taken into account in the formulation of electrostatic parallel-plate actuators when the gap separating the electrodes is comparable to the geometrical dimensions of the moving plate. Even in this case, the existing formulations often result in complicated mathematical models from which it is difficult to determine the deflection of the moving plate for given voltages and therefore to predict the necessary applied voltages for actuation control. This work presents a new method for the modeling of fringing field, in which the effect of fringing field is modeled as a serial capacitor. Numerical simulation demonstrates the suitability of this formulation. Based on this model, a robust control scheme is constructed using the theory of input-to-state stabilization (ISS) and back-stepping state feedback design. The stability and the performance of the system using this control scheme are demonstrated through both stability analysis and numerical simulation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:27:56 GMT" } ]
2007-11-29T00:00:00
[ [ "Hosseini", "M.", "" ], [ "Zhu", "G.", "" ], [ "Peter", "Y. -A.", "" ] ]
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711.3336
Rabindra Das Nath
Rabindra Nath Das, Rasajit Bera
Numerical evaluation of Chandrasekhar's H-function, its first and second differential coefficients, its pole and moments from the new form for plane parallel scattering atmosphere in radiative transfer
39 pages
null
null
null
astro-ph
null
In this paper, the new forms obtained for Chandrasekhar's H- function in Radiative Transfer by one of the authors both for non-conservative and conservative cases for isotropic scattering in a semi-infinite plane parallel atmosphere are used to obtain exclusively new forms for the first and second derivatives of H-function . The numerics for evaluation of zero of dispersion function, for evaluation of H-function and its derivatives and its zeroth, the first and second moments are outlined. Those are used to get ready and accurate extensive tables of H-function and its derivatives, pole and moments for different albedo for scattering by iteration and Simpson's one third rule . The schemes for interpolation of H-function for any arbitrary value of the direction parameter for a given albedo are also outlined. Good agreement has been observed in checks with the available results within one unit of ninth decimal
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:30:46 GMT" } ]
2007-11-22T00:00:00
[ [ "Das", "Rabindra Nath", "" ], [ "Bera", "Rasajit", "" ] ]
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711.3337
Emanuela Zaccarelli
Emanuela Zaccarelli, Stefan Andreev, Francesco Sciortino and David R. Reichman
Numerical Investigation of Glassy Dynamics in Low Density Systems
4 pages, 4 figures, revised version
null
10.1103/PhysRevLett.100.195701
null
cond-mat.dis-nn cond-mat.soft
null
Vitrification in colloidal systems typically occurs at high densities driven by sharply varying, short-ranged interactions. The possibility of glassy behavior arising from smoothly varying, long-ranged particle interactions has received relatively little attention. Here we investigate the behavior of screened charged particles, and explicitly demonstrate that these systems exhibit glassy properties in the regime of low temperature and low density. Properties close to this low density (Wigner) glass transition share many features with their hard-sphere counterparts, but differ in quantitative aspects that may be accounted for via microscopic theoretical considerations.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:31:47 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 17:03:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Zaccarelli", "Emanuela", "" ], [ "Andreev", "Stefan", "" ], [ "Sciortino", "Francesco", "" ], [ "Reichman", "David R.", "" ] ]
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711.3338
Travis Gagie
Travis Gagie (corresponding author)
Bounds for Compression in Streaming Models
added reduction from sorting to the Burrows-Wheeler Transform; thus, Grohe and Schweikardt's lower bound for short-sorting implies the same lower bound for the BWT
null
null
null
cs.IT math.IT
null
Compression algorithms and streaming algorithms are both powerful tools for dealing with massive data sets, but many of the best compression algorithms -- e.g., those based on the Burrows-Wheeler Transform -- at first seem incompatible with streaming. In this paper we consider several popular streaming models and ask in which, if any, we can compress as well as we can with the BWT. We first prove a nearly tight tradeoff between memory and redundancy for the Standard, Multipass and W-Streams models, demonstrating a bound that is achievable with the BWT but unachievable in those models. We then show we can compute the related Schindler Transform in the StreamSort model and the BWT in the Read-Write model and, thus, achieve that bound.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:32:07 GMT" }, { "version": "v2", "created": "Sat, 19 Apr 2008 14:54:21 GMT" } ]
2008-04-19T00:00:00
[ [ "Gagie", "Travis", "", "corresponding author" ] ]
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711.3339
Jonathan M. Flynn
J. M. Flynn and J. Nieves
Elastic s-wave scattering phase shifts and |Vub| from lattice calculations of form factors for exclusive semileptonic decays
7 pages, 3 figures, LaTeX
PoSLAT2007:352,2007
null
null
hep-lat
null
Omnes dispersion relations make a connection between form factors for exclusive semileptonic decays and phase shifts in the corresponding elastic scattering channels. We describe two applications. In the first, we use lattice form factor calculations to learn about phase shifts in elastic s-wave isospin-1/2 channels for K pi, B pi, D pi and D K scattering. The aim of the second application is to make the determination of the CKM matrix element magnitude |Vub| from exclusive semileptonic B to pi decays competitive with that from inclusive decays. Here we use many subtractions in an Omnes dispersion relation to motivate a simple fitting function, allowing data to constrain the q^2 shape of the differential decay rate and theory, primarily lattice results, to provide normalisation via form factor values.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:40:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Flynn", "J. M.", "" ], [ "Nieves", "J.", "" ] ]
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711.334
Titus S. van Erp
Titus S. van Erp
Efficient path sampling on multiple reaction channels
7 pages, 4 figures. Article submitted for the proceedings of the Conference on Computational Physics, Brussels 2007
null
10.1016/j.cpc.2008.01.023
null
cond-mat.stat-mech
null
Due to the time scale problem, rare events are not accessible by straight forward molecular dynamics. The presence of multiple reaction channels complicates the problem even further. The feasibility of the standard free energy based methods relies strongly on the success in finding a proper reaction coordinate. This can be very difficult task in high-dimensional complex systems and even more if several distinct reaction channels exist. Moreover, even if a proper reaction coordinate can be found, ergodic sampling will be a challenge. In this article, we discuss the recent advancements of path sampling methods to tackle this problem. We argue why the path sampling methods, via the transition interface sampling technique, is less sensitive to the choice of reaction coordinate. Moreover, we review a new algorithm, parallel path swapping, that can dramatically improve the ergodic sampling of trajectories for the multiple reaction channel systems.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:50:19 GMT" } ]
2009-11-13T00:00:00
[ [ "van Erp", "Titus S.", "" ] ]
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711.3341
Pawel Majewski
N.J.C. Spooner and P. Majewski (for the DRIFT II Collaboration)
The DRIFT Directional Dark Matter Detector and First Studies of the Head-Tail Effect
To appear in the proceedings of Dark 2007 Sixth International Heidelberg conference on "Dark Matter in Astro & Particle Physics", Sydney, Australia 24th-28th September 2007
null
10.1142/9789812814357_0011
null
physics.ins-det
null
Measurement of the direction of the elastic nuclear recoil track and ionization charge distribution along it, gives unique possibility for unambiguous detection of the dark matter WIMP particle. Within current radiation detection technologies only Time Projection Chambers filled with low pressure gas are capable of such measurement. Due to the character of the electronic and nuclear stopping powers of low energy nuclear recoils in the gas, an asymmetric ionization charge distribution along their tracks may be expected. Preliminary study of this effect, called Head-Tail, has been carried out here using the SRIM simulation program for Carbon and Sulfur in 40 Torr carbon disulfide, as relevant to the DRIFT detector. Investigations were focused on ion tracks projected onto the axis of the initial direction of motion in the energy range between 10 and 400 keV. Results indicate the likely existence of an asymmetry influenced by two competing effects: the nature of the stopping power and range straggling. The former tends to result in the Tail being greater than the Head and the latter the reverse. It has been found that for projected tracks the mean position of the ionization charge flows from 'head' to 'tail' with the magnitude depending on the ion type and its energy.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:54:33 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 14:04:39 GMT" } ]
2017-08-23T00:00:00
[ [ "Spooner", "N. J. C.", "", "for the DRIFT II Collaboration" ], [ "Majewski", "P.", "", "for the DRIFT II Collaboration" ] ]
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711.3342
Marc Hoffmann
Arnaud Gloter, Marc Hoffmann
Estimation of the Hurst parameter from discrete noisy data
Published in at http://dx.doi.org/10.1214/009053607000000316 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 1947-1974
10.1214/009053607000000316
IMS-AOS-AOS0270
math.ST stat.TH
null
We estimate the Hurst parameter $H$ of a fractional Brownian motion from discrete noisy data observed along a high frequency sampling scheme. The presence of systematic experimental noise makes recovery of $H$ more difficult since relevant information is mostly contained in the high frequencies of the signal. We quantify the difficulty of the statistical problem in a min-max sense: we prove that the rate $n^{-1/(4H+2)}$ is optimal for estimating $H$ and propose rate optimal estimators based on adaptive estimation of quadratic functionals.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:57:53 GMT" } ]
2007-12-18T00:00:00
[ [ "Gloter", "Arnaud", "" ], [ "Hoffmann", "Marc", "" ] ]
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711.3343
Alexandre Correia
A.C.M. Correia, S. Udry, M. Mayor, A. Eggenberger, D. Naef, J.-L. Beuzit, C. Perrier, D. Queloz, J.-P. Sivan, F. Pepe, N.C. Santos, D. S\'egransan
The ELODIE survey for northern extra-solar planets IV. HD196885, a close binary star with a 3.7-year planet
5 pages, 4 figures, 3 tables
Astron.Astrophys. 479:271-275 (2008)
10.1051/0004-6361:20078908
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Aims:We aim to significantly increase the number of detected extra-solar planets in a magnitude-limited sample to improve our knowledge of their orbital element distributions and thus obtain better constraints for planet-formation models. Methods: Radial-velocity data were taken at Haute-Provence Observatory (OHP, France) with the ELODIE echelle spectrograph. Results: We report the presence of a planet orbiting HD 196885 A, with an orbital period of 1349 days. This star was previously suggested to host a 386 -day planet, but we cannot confirm its existence. We also detect the presence of a stellar companion, HD 196885 B, and give some constraints on its orbit.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:24:48 GMT" }, { "version": "v2", "created": "Thu, 22 Dec 2016 11:52:35 GMT" } ]
2016-12-23T00:00:00
[ [ "Correia", "A. C. M.", "" ], [ "Udry", "S.", "" ], [ "Mayor", "M.", "" ], [ "Eggenberger", "A.", "" ], [ "Naef", "D.", "" ], [ "Beuzit", "J. -L.", "" ], [ "Perrier", "C.", "" ], [ "Queloz", "D.", "" ], [ "Sivan", "J. -P.", "" ], [ "Pepe", "F.", "" ], [ "Santos", "N. C.", "" ], [ "Ségransan", "D.", "" ] ]
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711.3344
Fabrice Martins
F. Martins (1), S. Gillessen (1), F. Eisenhauer (1), R. Genzel (1,2), T. Ott (1), S. Trippe (1) ((1) MPE Garching, (2) Berkeley)
On the nature of the fast moving star S2 in the Galactic Center
4 pages, 5 figures, ApJ letters accepted
null
10.1086/526768
null
astro-ph
null
We analyze the properties of the star S2 orbiting the supermassive black hole at the center of the Galaxy. A high quality SINFONI H and K band spectrum obtained from coadding 23.5 hours of observation between 2004 and 2007 reveals that S2 is an early B dwarf (B0-2.5V). Using model atmospheres, we constrain its stellar and wind properties. We show that S2 is a genuine massive star, and not the core of a stripped giant star as sometimes speculated to resolve the problem of star formation so close to the supermassive black hole. We give an upper limit on its mass loss rate, and show that it is He enriched, possibly because of the presence of a magnetic field.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:09:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Martins", "F.", "", "MPE Garching" ], [ "Gillessen", "S.", "", "MPE Garching" ], [ "Eisenhauer", "F.", "", "MPE Garching" ], [ "Genzel", "R.", "", "MPE Garching", "Berkeley" ], [ "Ott", "T.", "", "MPE Garching" ], [ "Trippe", "S.", "", "MPE Garching" ] ]
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711.3345
Wojciech Bruzda
V. Cappellini, H.-J. Sommers, W. Bruzda and K. Zyczkowski
Random Bistochastic Matrices
22 pages, 4 figures
J. Phys. A: Math. Theor. 42 (2009) 365209
null
null
nlin.SI cond-mat.stat-mech math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ensembles of random stochastic and bistochastic matrices are investigated. While all columns of a random stochastic matrix can be chosen independently, the rows and columns of a bistochastic matrix have to be correlated. We evaluate the probability measure induced into the Birkhoff polytope of bistochastic matrices by applying the Sinkhorn algorithm to a given ensemble of random stochastic matrices. For matrices of order N=2 we derive explicit formulae for the probability distributions induced by random stochastic matrices with columns distributed according to the Dirichlet distribution. For arbitrary $N$ we construct an initial ensemble of stochastic matrices which allows one to generate random bistochastic matrices according to a distribution locally flat at the center of the Birkhoff polytope. The value of the probability density at this point enables us to obtain an estimation of the volume of the Birkhoff polytope, consistent with recent asymptotic results.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:51:13 GMT" }, { "version": "v2", "created": "Mon, 24 Aug 2009 10:41:57 GMT" } ]
2009-09-29T00:00:00
[ [ "Cappellini", "V.", "" ], [ "Sommers", "H. -J.", "" ], [ "Bruzda", "W.", "" ], [ "Zyczkowski", "K.", "" ] ]
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711.3346
Oriana Mansutti
Alessandro De Angelis, Massimo Persic, Marco Roncadelli
Constraints on Large-Scale Magnetic Fields from the Auger Results
3 pages, no figures
Mod.Phys.Lett.A23:315-317,2008
10.1142/S0217732308026431
null
astro-ph
null
A recent article from the Pierre Auger Collaboration links the direction of charged cosmic rays to possible extragalactic sites of emission. The correlation of the direction of such particles with the direction of the emitter allows constraining the value of large-scale magnetic fields B. Assuming for B a coherence length in the range between 1 Mpc and 10 Mpc, we find values of B between 0.3 and 0.9 nG.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:28:26 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 12:18:13 GMT" }, { "version": "v3", "created": "Mon, 25 Feb 2008 11:57:13 GMT" } ]
2008-11-26T00:00:00
[ [ "De Angelis", "Alessandro", "" ], [ "Persic", "Massimo", "" ], [ "Roncadelli", "Marco", "" ] ]
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711.3347
Martin Jilek
Martin Jilek
Straight Quantum Waveguide with Robin Boundary Conditions
This is a contribution to the Proc. of the 3-rd Microconference "Analytic and Algebraic Methods III"(June 19, 2007, Prague, Czech Republic), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 108, 12 pages
10.3842/SIGMA.2007.108
null
math-ph math.MP math.SP quant-ph
null
We investigate spectral properties of a quantum particle confined to an infinite straight planar strip by imposing Robin boundary conditions with variable coupling. Assuming that the coupling function tends to a constant at infinity, we localize the essential spectrum and derive a sufficient condition which guarantees the existence of bound states. Further properties of the associated eigenvalues and eigenfunctions are studied numerically by the mode-matching technique.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:21:31 GMT" } ]
2008-04-25T00:00:00
[ [ "Jilek", "Martin", "" ] ]
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711.3348
Grzegorz Wilk
Grzegorz Wilk and Zbigniew Wlodarczyk
Example of a possible interpretation of Tsallis entropy
10 pages, 2 figures, modified version, accepted for publication in Physica A
Physica A387 (2008) 4809-4813
10.1016/j.physa.2008.04.022
null
cond-mat.stat-mech cond-mat.other hep-ph
null
We demonstrate and discuss the process of gaining information and show an example in which some specific way of gaining information about an object results in the Tsallis form of entropy rather than in the Shannon one.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:25:11 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 18:34:59 GMT" }, { "version": "v3", "created": "Tue, 8 Apr 2008 09:09:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Wilk", "Grzegorz", "" ], [ "Wlodarczyk", "Zbigniew", "" ] ]
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711.3349
Toshitaka Tatsumi
T. Tatsumi
Ferromagnetism in QCD phase diagram
9pages,1 figure, Proc. of EXOCT 2007
null
10.1142/9789812797049_0041
null
hep-ph
null
A possibility and properties of spontaneous magnetization in quark matter are investigated. Magnetic susceptibility is evaluated within Fermi liquid theory, taking into account of the screening effect of gluons. Spin wave in the polarized quark matter, as the Nambu-Goldstone mode, is formulated by way of the coherent-state path integral.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:36:37 GMT" } ]
2017-08-23T00:00:00
[ [ "Tatsumi", "T.", "" ] ]
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711.335
Wang Zhou
Oded Schramm, Wang Zhou
Boundary proximity of SLE
18 pages, new results are added, typos are corrected
null
null
null
math.PR math.CV
null
This paper examines how close the chordal $\SLE_\kappa$ curve gets to the real line asymptotically far away from its starting point. In particular, when $\kappa\in(0,4)$, it is shown that if $\beta>\beta_\kappa:=1/(8/\kappa-2)$, then the intersection of the $\SLE_\kappa$ curve with the graph of the function $y=x/(\log x)^{\beta}$, $x>e$, is a.s. bounded, while it is a.s. unbounded if $\beta=\beta_\kappa$. The critical $\SLE_4$ curve a.s. intersects the graph of $y=x^{-(\log\log x)^\alpha}$, $x>e^e$, in an unbounded set if $\alpha\le 1$, but not if $\alpha>1$. Under a very mild regularity assumption on the function $y(x)$, we give a necessary and sufficient integrability condition for the intersection of the $\SLE_\kappa$ path with the graph of $y$ to be unbounded. We also prove that the Hausdorff dimension of the intersection set of the $\SLE_{\kappa}$ curve and real axis is $2-8/\kappa$ when $4<\kappa<8$.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:33:43 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 03:50:54 GMT" }, { "version": "v3", "created": "Thu, 6 Dec 2007 07:28:58 GMT" } ]
2007-12-06T00:00:00
[ [ "Schramm", "Oded", "" ], [ "Zhou", "Wang", "" ] ]
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711.3351
Donato Fortunato
Vieri Benci, Donato Fortunato
Three dimensional vortices in Abelian Gauge Theories
31 pagine
null
null
null
math.AP math-ph math.MP
null
In this paper we consider an Abelian Gauge Theory in R^4 equipped with the Minkowski metric. This theory leads to a system of equations, the Klein-Gordon-Maxwell equations, which provide models for the interaction between the electromagnetic field and matter. A three dimensional vortex is a finite energy solution of these equations in which the magnetic field looks like the field created by a finite solenoid. Under suitable assumptions, we prove the existence of vortex-solutions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:35:04 GMT" } ]
2007-11-22T00:00:00
[ [ "Benci", "Vieri", "" ], [ "Fortunato", "Donato", "" ] ]
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711.3352
Akiyuki Kinouchi
S. Naka, A. Kinouchi and H. Toyoda
An Approach to SU_q(2)p Gauge Theory
12page,ptp
null
null
null
hep-th
null
In the usual approach to q-deformed gauge theories, the gauge fields are required to be non-local or non-commutative one's. If we introduce, however, an extended product, which we call `` $\star$-product\rq\rq, among the generators of a q-deformed Lie group, the deformed group can be reduced to a ordinary Lie group under the $\star$-product. According to this line of approach, we try to construct a $[SU_q(2)\times U(1)]_\star$, a $SU(2)\times U(1)$ analogue under the $\star$-product, gauge theory. In this gauge theory with the $\star$-product, the U(1) symmetry is naturally incorporated into the SU(2) symmetry. We also study the symmetry breaking by the Higgs mechanism associated with $J=1/2$ and J=1 representations of $SU_q(2)$ algebra, and show that the mixing angle between the SU(2) and U(1) gauge fields is determined uniquely in a tree level.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:35:29 GMT" } ]
2007-11-22T00:00:00
[ [ "Naka", "S.", "" ], [ "Kinouchi", "A.", "" ], [ "Toyoda", "H.", "" ] ]
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711.3353
Dmitri Panyushev
Dmitri I. Panyushev
On orbits of antichains of positive roots
12 pages, final version; to appear in Europ. J. Combinatorics
null
null
null
math.CO math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For any finite poset P, there is a natural operator $X$ acting on the antichains of P. We discuss conjectural properties of this operator for some graded posets associated with irreducible root systems. In particular, if $\Delta^+$ is the set of positive roots and $\Pi$ is the set of simple roots in $\Delta^+$, then we consider the cases $P=\Delta^+$ and $\Delta^+\setminus \Pi$. For the root system of type $A_n$, we consider an $X$-invariant integer-valued function on the set of antichains of $\Delta^+$ and establish some properties of it.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:41:32 GMT" }, { "version": "v2", "created": "Tue, 29 Jul 2008 17:42:52 GMT" } ]
2008-07-29T00:00:00
[ [ "Panyushev", "Dmitri I.", "" ] ]
[ -0.0615387112, -0.0192542803, 0.0958161503, 0.0801235139, 0.0810340047, -0.0012485825, -0.0642701983, 0.0107853422, -0.1637818813, -0.0034779548, -0.0111468621, -0.03489336, -0.0199505407, -0.0452301502, 0.1232916564, -0.035000477, -0.0181295518, -0.0565577708, 0.0520588569, 0.0978513733, 0.0640024021, -0.0273550022, 0.1203994974, 0.0014301792, 0.0426325649, -0.0292161591, -0.0001089999, 0.0674837083, 0.1711729616, -0.0444803312, 0.0248913113, -0.0202049427, 0.0488453507, -0.0068822666, -0.0409186929, 0.0084354635, -0.0020000751, 0.1090450957, -0.0747141019, 0.0983334035, -0.052085638, 0.0215706844, -0.0866040885, -0.0382675454, -0.0172190573, 0.0351343751, -0.0222937241, 0.008167671, -0.0400081985, 0.0166566931, -0.0709114522, 0.0756781548, 0.0255741812, 0.0396600664, -0.0388299115, -0.0386156775, -0.0336615145, 0.0136038577, -0.0454176068, -0.0843010768, 0.0578431748, -0.1579975635, 0.0111334724, 0.050666336, -0.068501316, 0.0142867286, -0.1001008302, 0.0844617486, 0.0169646535, -0.019160552, 0.0015339488, 0.0245565716, 0.0030076443, 0.0206601899, -0.0177546423, 0.0847295448, 0.016268393, 0.0676979423, 0.0116556678, 0.0580574088, -0.0096338345, 0.0613780357, 0.0865505338, -0.0533174835, 0.0661447421, -0.0196961369, -0.0069358251, -0.0378390774, -0.0763208568, -0.0005803565, 0.0629847944, -0.0562364198, 0.0114213498, -0.0100756921, 0.0657698363, -0.0298856404, 0.107706137, 0.0376784019, -0.0956019163, -0.0554866008, -0.0741249621, -0.0456050597, 0.0234318431, -0.0603604242, 0.0902996287, 0.0473724902, 0.0267658588, 0.0626098812, -0.0935131386, -0.1259695888, -0.0225079581, -0.0862827376, -0.1036356911, 0.0213162825, -0.0754103661, -0.0716612712, -0.0966730863, 0.0681264102, -0.0441589803, -0.0039700237, -0.01744668, -0.0664660931, 0.0060655, 0.049380932, 0.0427396819, -0.0438376293, 0.0122782858, -0.192596361, -0.0511751436, -0.1164361686, 0.1174002215, 0.0046930634, -0.0396065079, -0.0104439072, -0.1052424461, 0.0388566889, 0.0464352183, -0.0427396819, 0.0311442651, -0.0561293028, 0.039740406, -0.0628776774, 0.040490225, 0.0322957747, -0.0645915493, 0.0150499372, 0.0271541569, -0.0011372812, 0.0660376251, 0.0224811789, -0.0244360641, -0.0128875133, 0.0572004728, 0.0640024021, 0.0439715274, -0.0320815407, 0.0756246001, 0.0216644127, -0.0075316634, -0.0777133778, 0.0746605471, 0.037919417, 0.0643773153, -0.0578431748, 0.0651806891, 0.0748747811, -0.0873539075, -0.0360984281, -0.077338472, -0.0554330423, -0.1040641591, -0.0339025296, -0.0734822601, 0.0111535573, 0.0078396248, 0.0194819029, -0.2155193835, 0.0074312412, -0.0107116997, -0.0129812406, 0.0454711653, 0.1780284494, 0.0474796072, -0.077017121, 0.0242218301, -0.0096940883, 0.0774991438, 0.0314388387, -0.0723039731, 0.0957090333, -0.0045256931, 0.1482499242, 0.0527015589, 0.050559219, 0.0718219429, -0.1717085391, 0.0668410063, 0.011274064, -0.035214711, -0.039740406, 0.0336347371, 0.0098145949, 0.0682335272, 0.0689833462, 0.0232309978, -0.0303408876, 0.0242753886, 0.1192212105, -0.0751425698, -0.0391244814, -0.0264980663, -0.0442393199, -0.0317601897, 0.0005192664, 0.0219991524, -0.0355628431, -0.0141930012, 0.0476938412, -0.0639488474, 0.053692393, -0.0387495719, -0.0350272581, 0.1348602921, 0.1096877977, 0.0460870862, 0.078302525, 0.0190266557, 0.0336615145, 0.0378926359, -0.033500839, 0.0146482484, 0.0566113293, -0.0494612716, -0.0654484853, -0.0468636863, 0.0133226756, 0.0135971634, -0.0536388345, 0.0672694743, -0.0742856339, -0.0620742962, 0.0581645258, -0.0261633247, -0.0336347371, 0.0328849182, 0.0454443842, -0.0171119403, 0.0610031262, -0.0343309976, -0.0483633243, -0.0664125383, 0.0883179605, 0.0134967407, 0.0493541546, -0.0432484858, -0.0538262874 ]
711.3354
Razvan-Gheorghe Gurau
Razvan Gurau
The renormalization of non commutative \phi_4^{\star 4}
Contribution to "The Modern Encyclopedia of Mathematical Physics (MEMPhys)" project
null
null
null
math-ph math.MP
null
We present an overview of the different renormalization proofs of the non commutative $\phi_4^{\star 4}$ model. This paper is a contribution to the MemPhys project.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:49:39 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 15:48:37 GMT" } ]
2011-11-10T00:00:00
[ [ "Gurau", "Razvan", "" ] ]
[ -0.0065858294, 0.0819843411, -0.0743521675, 0.1071459055, 0.0115652084, -0.0470979139, -0.0467532314, 0.0514556393, -0.0172339454, 0.0022942692, -0.0015633651, 0.024927672, -0.0352803506, 0.0759770796, 0.1104942113, -0.0297901072, 0.0435526446, 0.0033852393, 0.0549516678, 0.1498860866, -0.0444635786, -0.020176027, 0.1673169881, -0.1137440428, -0.0325721577, -0.0363390073, 0.0080260951, -0.0636178777, 0.0663260743, -0.0898134783, -0.0188096203, -0.0424201265, -0.026663376, -0.0589893349, -0.1129562035, 0.0486735888, -0.0576598607, 0.0136763668, -0.0527358763, 0.1063580662, -0.0686895847, 0.0692804605, -0.0732688904, 0.0447343998, 0.0692804605, 0.0894687995, 0.0893210769, 0.0227364991, 0.0948851854, 0.0608112104, 0.0400566161, 0.011749858, 0.1070474237, -0.0052563534, -0.075090766, 0.0319074206, 0.0511109605, -0.0516525991, -0.0275250729, 0.0024712246, -0.0157936811, -0.1112820506, 0.0351572484, 0.0802609473, -0.162688449, 0.0416076705, -0.0729242116, -0.0237582251, 0.1439773142, 0.1225087345, -0.06691695, 0.0074352166, 0.0963131413, 0.0388502367, 0.0595309734, 0.0177140348, -0.0597279333, 0.0566750616, -0.0512094386, 0.069477424, -0.0145134442, -0.0439465605, 0.0995629653, 0.0030697966, -0.0337292925, -0.0460392572, 0.0339262523, 0.0379146822, -0.0368560255, -0.0940973461, 0.0474672094, 0.0486735888, -0.0842986181, -0.0120206773, 0.0200406164, -0.1058656648, -0.0441927612, 0.0356496498, 0.1196528226, 0.0123715112, -0.0058533866, 0.0099833785, -0.0003950728, -0.0574629009, 0.139447242, 0.0277958922, 0.0129008396, 0.018132573, -0.0806056261, 0.103896074, -0.0273527335, -0.1138425246, -0.0791776702, 0.0043269512, 0.0039822725, -0.1060626283, -0.0417061485, -0.0933587477, -0.0384070799, -0.0312919207, 0.0068504936, 0.0258755386, 0.0884840041, 0.0079891654, 0.0388748571, -0.0580045395, 0.0195359085, -0.1564842314, 0.0164584182, -0.0190188903, 0.0569212623, -0.0691819862, 0.0168892667, -0.0692804605, -0.0897642374, -0.0512586795, 0.0600233711, -0.031365782, 0.0357727483, 0.0469501913, -0.0052686636, 0.0782421157, -0.0694281831, 0.0783898309, -0.0229950082, 0.0356496498, -0.0318335593, 0.0145011349, 0.1037975922, -0.0395888351, -0.0838062167, -0.046482414, 0.0881885663, -0.0152889723, 0.0104080727, -0.102517359, 0.0538683906, 0.1089185402, 0.071102336, -0.0718901753, 0.0512094386, 0.0539668724, -0.1639686823, -0.0587431341, 0.1029112786, 0.0283129103, -0.0540161096, -0.0402289554, -0.0552963465, -0.0733673722, -0.0094602052, 0.0280667115, -0.0884347633, -0.0190188903, -0.0243367944, 0.0524404347, -0.0121006919, -0.0606142506, -0.0377177224, -0.0225764699, 0.0207669046, 0.0190435108, 0.0244352724, -0.0435034037, -0.0635194033, 0.0502492636, -0.0273527335, 0.0415584296, 0.0932602659, 0.0441435203, -0.0510124788, 0.0684433877, 0.0145749943, 0.0480827093, 0.0340985917, -0.0623376444, -0.0171477757, -0.0039114901, -0.0142795555, -0.0714962557, -0.0218132511, 0.0175909344, 0.0663753152, -0.0100018438, 0.034984909, -0.0130116288, 0.0624361224, -0.1021234393, -0.0354773104, 0.0833138153, -0.0358958468, 0.0661291108, 0.027426593, 0.0527851135, -0.0072690323, -0.0029574682, 0.0289776493, 0.0051178662, 0.0469501913, 0.1087215766, 0.0031344239, 0.0283375308, 0.0926693901, 0.0434541628, 0.0110605005, 0.0898134783, 0.0981842503, 0.038111642, -0.0097125592, 0.0429371446, 0.1129562035, 0.1054717526, -0.0649965927, -0.039071817, 0.0031128814, -0.1047823876, 0.0165199675, -0.0185511112, -0.0227241889, -0.1624914855, -0.0106850462, 0.091586113, -0.0473441109, 0.0123222712, -0.0088262428, 0.0832645819, -0.0150797023, 0.0048224274, 0.0438480824, -0.0272542536, -0.0151904924, 0.0558379851, -0.0132332081, -0.0031759699, -0.0517510772, 0.0703144968 ]
711.3355
Adrian Tanasa
Adrian Tanasa
Feynman amplitudes in renormalizable non-commutative quantum field theory
5 pages, contribution solicited by "The Modern Encyclopedia of Mathematical Physics (MEMPhys)"
null
null
null
math-ph math.MP
null
We consider here the Feynman amplitudes of renormalizable non-commutative quantum field theory models. Different representations (the parametric and the Mellin one) are presented. The latter further allows the proof of meromorphy of a amplitude in the space-time dimension.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:49:39 GMT" } ]
2007-11-22T00:00:00
[ [ "Tanasa", "Adrian", "" ] ]
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711.3356
Donato Fortunato
Vieri Benci, Donato Fortunato
Solitary waves in Abelian Gauge Theories
27 pages
null
null
null
math.AP math-ph math.MP
null
Abelian gauge theories consist of a class of field equations which provide a model for the interaction between matter and electromagnetic fields. In this paper we analyze the existence of solitary waves for these theories. We assume that the lower order term W is positive and we prove the existence of solitary waves if the coupling between matter and electromagnetic field is small. We point out that the positiveness assumption on W implies that the energy is positive: this fact makes these theories more suitable to model physical phenomena.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 11:56:08 GMT" } ]
2007-11-22T00:00:00
[ [ "Benci", "Vieri", "" ], [ "Fortunato", "Donato", "" ] ]
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711.3357
Vladimir Zverev V.
Vladimir Zverev, Boris Rubinstein
Self-similarity symmetry and fractal distributions in iterative dynamics of dissipative mappings
10 pages, one figure
null
null
null
math-ph math.MP
null
We consider transformations of deterministic and random signals governed by simple dynamical mappings. It is shown that the resulting signal can be a random process described in terms of fractal distributions and fractal domain integrals. In typical cases a steady state satisfies a dilatation equation, relating an unknown function $f(x)$ to $f(\kappa x)$ (for example, ${f(x)=g(x)f(\kappa x)}$). We discuss simple linear models as well as nonlinear systems with chaotic behavior including dissipative circuits with delayed feedback.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:00:54 GMT" } ]
2007-11-22T00:00:00
[ [ "Zverev", "Vladimir", "" ], [ "Rubinstein", "Boris", "" ] ]
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711.3358
Avery Meiksin
Avery A. Meiksin
The Physics of the Intergalactic Medium
69 pages; accepted version to appear in Reviews of Modern Physics; text and equation typos corrected; all figures included
Rev.Mod.Phys.81:1405-1469,2009
10.1103/RevModPhys.81.1405
null
astro-ph physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Intergalactic space is filled with a pervasive medium of ionized gas, the Intergalactic Medium (IGM). A residual neutral fraction is detected in the spectra of Quasi-Stellar Objects at both low and high redshifts, revealing a highly fluctuating medium with temperatures characteristic of photoionized gas. The statistics of the fluctuations are well-reproduced by numerical gravity-hydrodynamics simulations within the context of standard cosmological structure formation scenarios. As such, the study of the IGM offers an opportunity to probe the nature of the primordial density fluctuations on scales unavailable to other methods. The simulations also suggest the IGM is the dominant reservoir of baryons produced by the Big Bang, and so the principal source of the matter from which galaxies formed. The detection of metal systems within the IGM shows that it was enriched by evolved stars early in its history, demonstrating an intimate connection between galaxy formation and the IGM. The author presents a comprehensive review of the current understanding of the structure and physical properties of the IGM and its relation to galaxies, concluding with comments on prospects for furthering the study of the IGM using future ground-based facilities and space-based experiments.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:10:28 GMT" }, { "version": "v2", "created": "Tue, 12 Aug 2008 15:55:29 GMT" }, { "version": "v3", "created": "Mon, 15 Dec 2008 12:13:53 GMT" } ]
2014-11-18T00:00:00
[ [ "Meiksin", "Avery A.", "" ] ]
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711.3359
Madhukar Mishra Mr.
M. Mishra, C. P. Singh and V. J. Menon
J/\psi suppression at forward rapidity as a potential probe for QGP formation in colour screening scenario
18 pages, 6 figures, revised version
null
null
null
hep-ph
null
In order to study the properties of $J/\psi$ (1S) in the deconfining medium, we extend our previous formalism [Phys. Lett. B {\bf 656}, 45 (2007)] on $J/\psi$ suppression at mid-rapidity using the colour screening framework. Our formalism is more general as the complete rapidity, transverse momentum and centrality dependence including $J/\psi$ suppression at forward as well as mid-rapidity can be computed directly from it. Careful attention is paid to the role of the medium's proper time in determining the locus of the screening region where $J/\psi$ gets suppressed. Other important ingredients in the calculation are bag model equation of state for QGP, the longitudinal expansion of the QGP fluid obeying Bjorken's boost invariant scaling law and non-sequential/sequential melting of $\chi_c$ (1P) as well as $\psi^{'}$ (2S) higher resonances. Upon comparison with the recent data of PHENIX collaboration on $J/\psi$ suppression at forward and mid-rapidity regions, we find that our model shows a reasonable agreement with the data without incorporating any sequential decay mechanism of higher charmonia states. Furthermore, we observe a larger suppression at forward rapidity in our model which is again well supported by the PHENIX data and also gives a hint that a scenario based on directly produced $J/\psi$'s is preferable.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:01:28 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 05:32:03 GMT" }, { "version": "v3", "created": "Wed, 12 Mar 2008 08:41:24 GMT" }, { "version": "v4", "created": "Fri, 18 Apr 2008 06:15:18 GMT" } ]
2008-04-18T00:00:00
[ [ "Mishra", "M.", "" ], [ "Singh", "C. P.", "" ], [ "Menon", "V. J.", "" ] ]
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711.336
Gianluca Calcagni
Gianluca Calcagni and Andrew R. Liddle
Stability of multi-field cosmological solutions
6 pages; v2: typos corrected, version accepted by PRD
Phys.Rev.D77:023522,2008
10.1103/PhysRevD.77.023522
null
astro-ph gr-qc hep-th
null
We explore the stability properties of multi-field solutions of assisted inflation type, where several fields collectively evolve to the same configuration. In the case of noninteracting fields, we show that the condition for such solutions to be stable is less restrictive than that required for tracking in quintessence models. Our results, which do not rely on the slow-roll approximation, further indicate that to linear order in homogeneous perturbations the fields are in fact unaware of each other's existence. We end by generalizing our results to some cases of interacting fields and to other background solutions and dynamics, including the high-energy braneworld.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:08:47 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 15:50:14 GMT" } ]
2008-12-18T00:00:00
[ [ "Calcagni", "Gianluca", "" ], [ "Liddle", "Andrew R.", "" ] ]
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711.3361
Tzu Chiang Yuan
Kingman Cheung, Chong Sheng Li and Tzu-Chiang Yuan
Higgs Boson Decays into Single Photon plus Unparticle
10 pages, 3 figures
Phys.Rev.D77:097701,2008
10.1103/PhysRevD.77.097701
null
hep-ph
null
The decay of the standard model Higgs boson into a single photon and a vector unparticle through a one-loop process is studied. For an intermediate mass Higgs boson, this single photon plus unparticle mode can have a branching ratio comparable with the two-photon discovery mode. The emitted photon has a continuous energy spectrum encoding the nature of the recoil unparticle. It can be measured in precision studies of the Higgs boson after its discovery.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:15:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Cheung", "Kingman", "" ], [ "Li", "Chong Sheng", "" ], [ "Yuan", "Tzu-Chiang", "" ] ]
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711.3362
Nicolas Brunner
Nicolas Brunner, Nicolas Gisin
Partial list of bipartite Bell inequalities with four binary settings
6 pages. Other inequalities welcome. Accepted for publication in Phys. Lett. A
Phys. Lett. A 372 (2008) 3162
10.1016/j.physleta.2008.01.052
null
quant-ph
null
We give a partial list of 26 tight Bell inequalities for the case where Alice and Bob choose among four two-outcome measurements. All tight Bell inequalities with less settings are reviewed as well. For each inequality we compute numerically the maximal quantum violation, the resistance to noise and the minimal detection efficiency required for closing the detection loophole. Surprisingly, most of these inequalities are outperformed by the CHSH inequality.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:06:11 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 10:32:47 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 10:50:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Brunner", "Nicolas", "" ], [ "Gisin", "Nicolas", "" ] ]
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711.3363
Veronica Felli
Veronica Felli, Elsa M. Marchini, Susanna Terracini
On Schr\"odinger operators with multisingular inverse-square anisotropic potentials
null
null
null
null
math.AP math.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study positivity, localization of binding and essential self-adjointness properties of a class of Schroedinger operators with many anisotropic inverse square singularities, including the case of multiple dipole potentials.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:51:46 GMT" }, { "version": "v2", "created": "Thu, 22 Jan 2009 12:19:46 GMT" } ]
2009-01-22T00:00:00
[ [ "Felli", "Veronica", "" ], [ "Marchini", "Elsa M.", "" ], [ "Terracini", "Susanna", "" ] ]
[ -0.0181496143, -0.0157080162, 0.0789971277, 0.0160688423, -0.0646121427, 0.0676912069, -0.0276874825, -0.0313679203, -0.0677393153, -0.0550381914, -0.0165379178, -0.0168867186, -0.030958984, 0.020314578, 0.0621585175, 0.0506601557, -0.0155155743, 0.0225035958, 0.0220826305, -0.0062002158, 0.0151186641, -0.0992034525, 0.0862617791, -0.0026190048, -0.0255946834, -0.0451034121, -0.0147698643, 0.0093394136, 0.1343239844, 0.021998439, 0.0166100841, -0.044935029, -0.0571069345, -0.0949216411, -0.1054577976, 0.1855133474, -0.001017082, 0.1386539042, -0.0772651508, -0.0123282662, 0.0029482597, -0.0765916109, -0.0838081539, 0.023104975, 0.0296600051, 0.0573474877, 0.0320655219, 0.0379349776, 0.0366359986, -0.0164176431, -0.0460656211, -0.0197492819, 0.1047842503, -0.0587426871, -0.0070241052, -0.035409186, 0.030020833, 0.0296840593, -0.003409818, -0.0871277675, -0.0140121272, -0.0691826195, 0.0533543304, 0.0347837508, -0.1896508336, 0.0854439065, -0.095787622, 0.066199787, -0.0676912069, 0.0097904475, -0.0396669507, 0.0245723389, 0.0827497318, 0.0980488062, 0.0015861368, 0.0433473885, -0.0386325754, -0.0062603536, 0.0007923166, -0.0006070168, 0.0369968265, 0.0188472122, 0.0522477962, -0.0556155145, -0.0211805627, 0.0276634265, -0.0267974418, -0.0534505509, -0.1513550282, 0.1282620877, 0.0908322632, -0.0166221112, -0.0755331814, 0.0317287482, 0.1359597296, -0.146351561, 0.1203719899, -0.058887016, -0.0196650885, -0.0243317876, -0.090736039, 0.0330517814, 0.0252819676, -0.0369487181, 0.0389452949, 0.0206152666, 0.0319452435, -0.0047899825, 0.1028598398, -0.0318971351, -0.0330517814, -0.1111348122, -0.001449323, -0.0534505509, 0.030189218, -0.0860212296, -0.0479659773, 0.0138677964, -0.1230661646, 0.0065550297, -0.0081186146, -0.042842228, 0.0636980459, 0.0550863035, 0.0716843605, -0.1051691324, -0.0188832954, 0.0085095111, -0.0910728127, -0.0967017189, 0.0356256813, -0.0242596231, -0.0895332843, -0.0226840097, 0.0518629104, -0.0483027473, 0.0443817601, -0.0204228256, 0.100454323, 0.0203987714, 0.0744266436, 0.1024749577, 0.0711070374, 0.0525845662, 0.0297081154, -0.043443609, 0.0431549475, 0.0443817601, 0.1021862924, -0.0463302247, 0.0076314975, -0.0406772643, 0.0702410489, 0.0912171453, -0.0134949414, -0.0714919195, 0.0149141951, 0.0364435576, 0.028144531, 0.020134164, 0.016393587, 0.0411583669, -0.0792857856, -0.0779868066, 0.0118832458, 0.0072105322, -0.0224915687, -0.0276634265, -0.0164898075, -0.1155609563, -0.0138437413, -0.134516418, -0.0288661849, 0.006705374, 0.0280723646, -0.0739455447, 0.0291067362, -0.0116126258, -0.0954508483, 0.0722616836, 0.0508044846, 0.103629604, 0.0671619922, 0.0190997925, 0.0137715759, -0.0235499963, -0.0521034636, 0.1422140747, -0.0569144934, -0.0086899241, -0.0772651508, 0.1225850657, 0.1724273413, 0.1460628957, 0.000100731, -0.1303789318, 0.068076089, 0.0466910526, -0.0207235143, 0.0217578877, 0.0457047932, -0.0153351603, 0.0937188789, 0.0156238228, 0.0258592907, -0.015852347, 0.011546474, 0.0196169782, -0.0349761955, -0.0512855873, 0.0382958055, 0.0268696062, 0.0115765426, -0.0265087802, -0.0006588857, 0.0491206236, 0.0468594395, 0.0851552486, -0.0472924337, 0.1418291926, -0.0463542826, 0.0930934474, -0.0080043525, 0.0345191471, 0.0385604128, -0.0210121777, 0.0674987584, -0.0185826067, -0.0429625064, -0.0193523709, 0.0368284397, 0.0352648571, 0.0218541082, 0.0374538749, -0.0525364578, -0.1035333797, 0.0643715933, 0.0299246106, -0.0685571879, -0.0658149049, 0.0106684612, 0.0336291045, 0.0377665907, -0.0029512667, 0.0515742488, 0.0088101998, 0.0709627047, 0.0848184749, 0.0232493058, -0.0288902391, -0.0474608205, 0.1079595312, 0.1043993682, 0.0427460074, -0.0457288474, 0.0156839602 ]
711.3364
Panu Rahkila
P. Rahkila (University of Jyvaskyla, Finland)
Grain - A Java Analysis Framework for Total Data Readout
Submitted to NIM A
Nucl.Instrum.Meth.A595:637-642,2008
10.1016/j.nima.2008.08.039
null
nucl-ex physics.data-an
null
Grain is a data analysis framework developed to be used with the novel Total Data Readout data acquisition system. In Total Data Readout all the electronics channels are read out asynchronously in singles mode and each data item is timestamped. Event building and analysis has to be done entirely in the software post-processing the data stream. A flexible and efficient event parser and the accompanying software framework have been written entirely in Java. The design and implementation of the software are discussed along with experiences gained in running real-life experiments.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:27:41 GMT" } ]
2010-03-02T00:00:00
[ [ "Rahkila", "P.", "", "University of Jyvaskyla, Finland" ] ]
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711.3365
Cluckers Raf
R. Cluckers
Exponential sums: questions by Denef, Sperber, and Igusa
null
null
null
null
math.NT
null
We prove the remaining part of the conjecture by Denef and Sperber [Denef, J. and Sperber, S., \textit{Exponential sums mod $p^n$ and {N}ewton polyhedra}, Bull. Belg. Math. Soc., {\bf{suppl.}} (2001) 55-63] on nondegenerate local exponential sums modulo $p^m$. We generalize Igusa's conjecture of the introduction of [Igusa, J., \textit{Lectures on forms of higher degree}, Lect. math. phys., Springer-Verlag, {\bf{59}} (1978)] from the homogeneous to the quasi-homogeneous case and prove the nondegenerate case as well as the modulo $p$ case. We generalize some results by Katz of [Katz, N. M., \textit{Estimates for "singular" exponential sums}, Internat. Math. Res. Notices (1999) no. 16, 875-899] on finite field exponential sums to the quasi-homogeneous case.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:13:44 GMT" } ]
2007-11-22T00:00:00
[ [ "Cluckers", "R.", "" ] ]
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711.3366
Johannes Bleibel
J. Bleibel (1), G. Burau (2), C. Fuchs (1) ((1) Institute for Theoretical Physics, University of Tuebingen, Germany, (2) Institute for Theoretical Physics, University of Frankfurt a. M., Germany)
Anisotropic flow in Pb+Pb collisions at LHC from the quark gluon string model with parton rearrangement
6 pages, 4 figures, accepted for publication in Phys. Lett. B
Phys.Lett.B659:520-524,2008
10.1016/j.physletb.2007.11.042
null
nucl-th
null
We present predictions for the pseudorapidity dependence of the azimuthal anisotropy parameters v_1 and v_2 of baryons and inclusive charged hadrons in Pb+Pb collisions at a LHC energy of sqrt(s) = 5.5 TeV applying a microscopic transport model, namely the quark gluon string model (QGSM) which has been recently extended for parton rearrangement and fusion processes. Pb+Pb collisions with impact parameters b = 2.3 fm and b = 8 fm have been simulated in order to investigate additionally the difference between central and semiperipheral configurations. In contrast to v_1(eta) at RHIC, the directed flow of charged hadrons shows a small normal flow alignment. The elliptic flow v_2(eta) turns out to be rather similar in shape for RHIC and LHC conditions, the magnitude however increases about 10-20 % at the LHC, leading to the conclusion that the hydrodynamical limit will be reached.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:54:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Bleibel", "J.", "" ], [ "Burau", "G.", "" ], [ "Fuchs", "C.", "" ] ]
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711.3367
Christian Fuchs
Christian Fuchs
The high density equation of state: constraints from accelerators and astrophysics
Invited contribution to the 4th International Workshop on Critical Point and Onset Deconfinement, Darmstadt, Germany, 9-13 Jul 2007
PoSCPOD07:060,2007
null
null
nucl-th
null
The nuclear equation of state (EoS) at high densities and/or extreme isospin is one of the longstanding problems of nuclear physics. In the last years substantial progress has been made to constrain the EoS both, from the astrophysical side and from accelerator based experiments. Heavy ion experiments support a soft EoS at moderate densities while the possible existence of high mass neutron star observations favors a stiff EoS. Ab initio calculations for the nuclear many-body problem make predictions for the density and isospin dependence of the EoS far away from the saturation point. Both, the constraints from astrophysics and accelerator based experiments are shown to be in agreement with the predictions from many-body theory.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:01:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Fuchs", "Christian", "" ] ]
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711.3368
Eric Emtander
Eric Emtander
Betti numbers of hypergraphs
To appear in Communications in Algebra
null
null
null
math.AC math.CO
null
In this paper we study some algebraic properties of hypergraphs, in particula their Betti numbers. We define some different types of complete hypergraphs, which to the best of our knowledge, are not previously considered in the literature. Also, in a natural way, we define a product on hypergraphs, which in a sense is dual to the join operation on simplicial complexes. For such product, we give a general formula for the Betti numbers, which specializes neatly in case of linear resolutions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:01:29 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 11:33:27 GMT" }, { "version": "v3", "created": "Wed, 6 Feb 2008 09:07:42 GMT" } ]
2008-02-06T00:00:00
[ [ "Emtander", "Eric", "" ] ]
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711.3369
Agnes Sambale
Agnes Sambale, Stefan Yoshi Buhmann, Dirk-Gunnar Welsch, Ho Trung Dung
Van der Waals interaction and spontaneous decay of an excited atom in a superlens-type geometry
10 Pages, 6 figures
Physical Review A 78 (5), 053828 (2008)
10.1103/PhysRevA.78.053828
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Within the framework of macroscopic quantum electrodynamics, the resonant van der Waals potential experienced by an excited two-level atom near a planar magneto-electric two-layer system consisting of a slab of left-handed material and a perfect mirror is studied. It is shown that disregarding of material absorption leads to unphysical results, with divergent values for the potential away from the surface. Under appropriate conditions, the setup is found to feature a barrier near the surface which can be employed to levitate particles or used as a trapping or cooling mechanism. Finally, the problem of spontaneous decay [J. K\"{a}stel and M. Fleischhauer, Phys. Rev. A \textbf{68}, 011804(R) (2005)] is revisited. Disregarding of absorption is shown to drastically falsify the dependence on the atomic position of the decay rate.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:10:33 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 06:41:01 GMT" }, { "version": "v3", "created": "Fri, 28 Nov 2008 11:35:04 GMT" } ]
2009-02-17T00:00:00
[ [ "Sambale", "Agnes", "" ], [ "Buhmann", "Stefan Yoshi", "" ], [ "Welsch", "Dirk-Gunnar", "" ], [ "Dung", "Ho Trung", "" ] ]
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711.337
Marco Giuseppe Pala
M. G. Pala, B. Hackens, F. Martins, H. Sellier, V. Bayot, S. Huant, and T. Ouisse
Local Density of States in Mesoscopic Samples from Scanning Gate Microscopy
8 pages, 8 figures
Phys. Rev. B 77, 125310 (2008)
10.1103/PhysRevB.77.125310
null
cond-mat.mes-hall
null
We study the relationship between the local density of states (LDOS) and the conductance variation $\Delta G$ in scanning-gate-microscopy experiments on mesoscopic structures as a charged tip scans above the sample surface. We present an analytical model showing that in the linear-response regime the conductance shift $\Delta G$ is proportional to the Hilbert transform of the LDOS and hence a generalized Kramers-Kronig relation holds between LDOS and $\Delta G$. We analyze the physical conditions for the validity of this relationship both for one-dimensional and two-dimensional systems when several channels contribute to the transport. We focus on realistic Aharonov-Bohm rings including a random distribution of impurities and analyze the LDOS-$\Delta G$ correspondence by means of exact numerical simulations, when localized states or semi-classical orbits characterize the wavefunction of the system.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:14:17 GMT" } ]
2008-03-13T00:00:00
[ [ "Pala", "M. G.", "" ], [ "Hackens", "B.", "" ], [ "Martins", "F.", "" ], [ "Sellier", "H.", "" ], [ "Bayot", "V.", "" ], [ "Huant", "S.", "" ], [ "Ouisse", "T.", "" ] ]
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711.3371
Eric Bahuaud
Eric Bahuaud
Intrinsic characterization for Lipschitz asymptotically hyperbolic metrics
18 pages; correction to Theorem 1
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conformally compact asymptotically hyperbolic metrics have been intensively studied. The goal of this note is to understand what intrinsic conditions on a complete Riemannian manifold (M,g) will ensure that g is asymptotically hyperbolic in this sense. We use the geodesic compactification by asymptotic geodesic rays to compactify M and appropriate curvature decay conditions to study the regularity of the conformal compactification. We also present an interesting example that shows our conclusion is nearly optimal for our assumptions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:16:34 GMT" }, { "version": "v2", "created": "Fri, 11 Jul 2008 07:17:51 GMT" } ]
2008-07-11T00:00:00
[ [ "Bahuaud", "Eric", "" ] ]
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711.3372
Attila R\'akos
A. R\'akos and R. J. Harris
On the range of validity of the fluctuation theorem for stochastic Markovian dynamics
37 pages, 10 figures. Minor alterations, fixed typos (as appeared in JSTAT)
Journal of Statistical Mechanics: Theory and Experiment 2008, P05005
10.1088/1742-5468/2008/05/P05005
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the fluctuations of generalized currents in stochastic Markovian dynamics. The large deviations of current fluctuations are shown to obey a Gallavotti-Cohen (GC) type symmetry in systems with a finite state space. However, this symmetry is not guaranteed to hold in systems with an infinite state space. A simple example of such a case is the Zero-Range Process (ZRP). Here we discuss in more detail the already reported breakdown of the GC symmetry in the context of the ZRP with open boundaries and we give a physical interpretation of the phases that appear. Furthermore, the earlier analytical results for the single-site case are extended to cover multiple-site systems. We also use our exact results to test an efficient numerical algorithm of Giardina, Kurchan and Peliti, which was developed to measure the current large deviation function directly. We find that this method breaks down in some phases which we associate with the gapless spectrum of an effective Hamiltonian.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:37:17 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 14:09:18 GMT" } ]
2008-06-06T00:00:00
[ [ "Rákos", "A.", "" ], [ "Harris", "R. J.", "" ] ]
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711.3373
Mercedes Molla
Marisa Garc\'ia-Vargas (1), Mercedes Moll\'a (2), Alessandro Bressan (3) and Pedro G\'omez-Alvarez (4) ((1) FRACTAL SLNE, Las Rozas de Madrid, Spain, (2)CIEMAT, Madrid, Spain, (3)INAF. Osservatorio Astronomico di Padova, Padova, Italy, (4) ESAC, Villafranca del Castillo, Madrid, Spain)
PopStar: A new grid of Evolutionary Synthesis Models in the Virtual Observatory
2 pages, 1 figure, proceeding of Astronomical Spectroscopy and Virtual Observatory workshop, Villafranca del Castillo, Madrid
null
null
null
astro-ph
null
We present a new set of theoretical evolutionary synthesis models, PopStar. This grid of Single Stellar Populations covers a wide range in both, age and metallicity. The models use the most recent evolutionary tracks together with the use of new NLTE atmosphere models for the hot stars (O, B, WR, post-AGB stars, planetary nebulae) that dominate the stellar cluster's ionizing spectra. The results of the models in VO format can be used through VOSpec.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:18:04 GMT" } ]
2007-11-22T00:00:00
[ [ "García-Vargas", "Marisa", "" ], [ "Mollá", "Mercedes", "" ], [ "Bressan", "Alessandro", "" ], [ "Gómez-Alvarez", "Pedro", "" ] ]
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711.3374
Kevin Goldstein
Kevin Goldstein and Hossein Yavartanoo
A note on non-linear electrodynamics, regular black holes and the entropy function
10 pages, 2 figures, pdflatex
null
null
SPIN-07/47, ITP-UU-07/61
hep-th gr-qc
null
We examine four dimensional magnetically charged extremal black holes in certain non-linear U(1) gauge theories coupled to two derivative gravity. For a given coupling, one can tune the magnetic charge (or vice versa) so that the curvature singularity at the centre of the space-time is cancelled. Since these solutions have a horizon but no singularity, they have been called regular black holes. Contrary to recent claims in the literature, we find that the entropy function formalism reproduces the near horizon geometry and gives the correct entropy for these objects.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:33:23 GMT" } ]
2007-11-22T00:00:00
[ [ "Goldstein", "Kevin", "" ], [ "Yavartanoo", "Hossein", "" ] ]
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711.3375
Loredana Afanasiev
Loredana Afanasiev, Torsten Grust, Maarten Marx, Jan Rittinger, Jens Teubner
An Inflationary Fixed Point Operator in XQuery
11 pages, 10 figures, 2 tables
null
null
null
cs.DB
null
We introduce a controlled form of recursion in XQuery, inflationary fixed points, familiar in the context of relational databases. This imposes restrictions on the expressible types of recursion, but we show that inflationary fixed points nevertheless are sufficiently versatile to capture a wide range of interesting use cases, including the semantics of Regular XPath and its core transitive closure construct. While the optimization of general user-defined recursive functions in XQuery appears elusive, we will describe how inflationary fixed points can be efficiently evaluated, provided that the recursive XQuery expressions exhibit a distributivity property. We show how distributivity can be assessed both, syntactically and algebraically, and provide experimental evidence that XQuery processors can substantially benefit during inflationary fixed point evaluation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:22:15 GMT" } ]
2007-11-22T00:00:00
[ [ "Afanasiev", "Loredana", "" ], [ "Grust", "Torsten", "" ], [ "Marx", "Maarten", "" ], [ "Rittinger", "Jan", "" ], [ "Teubner", "Jens", "" ] ]
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711.3376
Sacha Davidson
Sacha Davidson, Gino Isidori, Selma Uhlig
Solving the flavour problem with hierarchical fermion wave functions
14 pages, references added, minor changes, version accepted for publication
Phys.Lett.B663:73-79,2008
10.1016/j.physletb.2008.04.005
TUM-HEP-677/07
hep-ph
null
We investigate the flavour structure of generic extensions of the SM where quark and lepton mass hierarchies and the suppression of flavour-changing transitions originate only by the normalization constants of the fermion kinetic terms. We show that in such scenarios the contributions to quark FCNC transitions from dimension-six effective operators are sufficiently suppressed without (or with modest) fine tuning in the effective scale of new physics. The most serious challenge to this type of scenarios appears in the lepton sector, thanks to the stringent bounds on LFV. The phenomenological consequences of this scenarios in view of improved experimental data on quark and lepton FCNC transitions, and its differences with respect to the Minimal Flavour Violation hypothesis are also discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:28:56 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 12:33:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Davidson", "Sacha", "" ], [ "Isidori", "Gino", "" ], [ "Uhlig", "Selma", "" ] ]
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711.3377
Mikio Kozuma
K. Akiba, K. Kashiwagi, M. Arikawa, and M. Kozuma
Storage and retrieval of nonclassical photon pairs and conditional single photons generated by parametric down-conversion process
4 figures
New J. Phys. 11, 013049 (2009)
10.1088/1367-2630/11/1/013049
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Storage and retrieval of parametric down-conversion (PDC) photons are demonstrated with electromagnetically induced transparency (EIT). Extreme frequency filtering is performed for THz order of broadband PDC light and the frequency bandwidth of the light is reduced to MHz order. Storage and retrieval procedures are carried out for the frequency filtered PDC photons. Since the filtered bandwidth [full width at half-maximum (FWHM) = 9 MHz] is within the EIT window (FWHM = 12.6 MHz), the flux of the PDC light is successfully stored and retrieved. The nonclassicality of the retrieved light is confirmed by using photon counting method, where the classical inequality which is only satisfied for classical light fields is introduced. Since the PDC photons can be utilized for producing the single photon state conditionally, storage and retrieval procedures are also performed for the conditional single photons. Anti-correlation parameter used for checking the property of single photon state shows the value less than 1, which means the retrieved light is in a non-classical region.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:52:51 GMT" }, { "version": "v2", "created": "Tue, 3 Feb 2009 01:22:25 GMT" } ]
2015-05-13T00:00:00
[ [ "Akiba", "K.", "" ], [ "Kashiwagi", "K.", "" ], [ "Arikawa", "M.", "" ], [ "Kozuma", "M.", "" ] ]
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711.3378
You-Quan Li
Yuan Li and You-Quan Li
Strain-assisted spin manipulating and the discerption of strain-induced spin splitting
Revtex, 7 pages, 5 figures
Eur. Phys. J. B 63, 493-500 (2008)
10.1140/epjb/e2008-00265-y
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We show that the efficiency of manipulating electron spin in semiconductor quantum wells can be enhanced by tuning the strain strength. The effect combining intrinsic and strain-induced spin splitting varies for different systems, which provides an alternative route to understand the experimental phenomena brought in by the strain. The types of spin splittings caused by strain are suggested to be distinguished by the measurement of the electron-dipole-spin-resonance intensity through changing the direction of the $ac$ electric field in the $x$-$y$ plane of the quantum well and tuning the strain strengths.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 13:55:15 GMT" } ]
2008-07-16T00:00:00
[ [ "Li", "Yuan", "" ], [ "Li", "You-Quan", "" ] ]
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711.3379
Patricio Gaete
Patricio Gaete and Jos\'e A. Hela\"yel-Neto
On scale symmetry breaking and confinement in D=3 models
6 pages, references added
J.Phys.A41:425401,2008
10.1088/1751-8113/41/42/425401
USM-TH-222
hep-th
null
Within the framework of the gauge-invariant, but path-dependent, variables formalism, we study the connection between scale symmetry breaking and confinement in three-dimensional gluodynamics. We explicitly show that the static potential profile contains a linear potential, leading to the confinement of static charges. Also, we establish a new type of equivalence among different three-dimensional effective theories.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:02:18 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 15:04:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Gaete", "Patricio", "" ], [ "Helaÿel-Neto", "José A.", "" ] ]
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711.338
Karl Schwede
Karl Schwede
Generalized test ideals, sharp F-purity, and sharp test elements
Theorem 2.9 added. Several typos corrected and proofs expanded. To appear in Mathematical Research Letters
Math. Res. Lett. 15 (2008), no. 6, 1251--1261
null
null
math.AC math.AG
null
Consider a pair $(R, \ba^t)$ where $R$ is a ring of positive characteristic, $\ba$ is an ideal such that $a \cap $R^{\circ} \neq \emptyset$, and $t > 0$ is a real number. In this situation we have the ideal $\tau_R(\ba^t)$, the generalized test ideal associated to $(R, a^t)$ as defined by Hara and Yoshida. We show that $\tau_R(a^t) \cap R^{\circ}$ is made up of appropriately defined generalized test elements which we call \emph{sharp test elements}. We also define a variant of $F$-purity for pairs, \emph{sharp $F$-purity}, which interacts well with sharp test elements and agrees with previously defined notions of $F$-purity in many common situations. We show that if $(R, \ba^t)$ is sharply F-pure, then $\tau_R(\ba^t)$ is a radical ideal. Furthermore, by following an argument of Vassilev, we show that if $R$ is a quotient of an $F$-finite regular local ring and $(R, \ba^t)$ is sharply $F$-pure, then $R/{\tau_R(\ba^t)}$ itself is $F$-pure. We conclude by showing that sharp $F$-purity can be used to define the $F$-pure threshold. As an application we show that the $F$-pure threshold must be a rational number under certain hypotheses.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:19:19 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 23:55:05 GMT" } ]
2009-04-28T00:00:00
[ [ "Schwede", "Karl", "" ] ]
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711.3381
Momme Winkelnkemper
M. Winkelnkemper, R. Seguin, S. Rodt, A. Schliwa, L. Reissmann, A. Strittmatter, A. Hoffmann, D. Bimberg
Polarized Emission Lines from Single InGaN/GaN Quantum Dots: Role of the Valence-band Structure of Wurtzite Group-III Nitrides
Conf. Proc. of the MSS-13 in Genova 2007, accepted at Physica E
Physica E 40, 2217 (2008)
10.1016/j.physe.2007.11.033
null
cond-mat.mtrl-sci
null
We present a study of the polarization properties of emission lines from single InGaN/GaN quantum dots (QDs). The QDs, formed by spinodal decomposition within ultra-thin InGaN quantum wells, are investigated using single-QD cathodoluminescence (CL). The emission lines exhibit a systematic linear polarization in the orthogonal crystal directions [1 1 -2 0] and [-1 1 0 0]--a symmetry that is non-native to hexagonal crystals. Eight-band k.p calculations reveal a mechanism that can explain the observed polarizations: The character of the hole(s) in an excitonic complex determines the polarization direction of the respective emission if the QD is slightly elongated. Transitions involving A-band holes are polarized parallel to the elongation; transitions involving B-type holes are polarized in the orthogonal direction. The energetic separation of both hole states is smaller than 10 meV. The mechanism leading to the linear polarizations is not restricted to InGaN QDs, but should occur in other wurtzite-nitride QDs and in materials with similar valence band structure.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:26:34 GMT" } ]
2008-06-13T00:00:00
[ [ "Winkelnkemper", "M.", "" ], [ "Seguin", "R.", "" ], [ "Rodt", "S.", "" ], [ "Schliwa", "A.", "" ], [ "Reissmann", "L.", "" ], [ "Strittmatter", "A.", "" ], [ "Hoffmann", "A.", "" ], [ "Bimberg", "D.", "" ] ]
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711.3382
Nihal Buyukcizmeci
N. Buyukcizmeci (1), A.S.Botvina (2,3), I.N. Mishustin (3,4) and R. Ogul (1) ((1)Department of Physics, University of Selcuk, Konya, Turkey, (2)Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia, (3)Frankfurt Institute for Advanced Studies, J.W. Goethe University, Frankfurt am Main, Germany, (4)Kurchatov Institute, Russian Research Center, Moscow, Russia)
The role of bulk energy in nuclear multifragmentation
8 pages, 7 figures, to be published in Phys. Rev. C
Phys.Rev.C77:034608,2008
10.1103/PhysRevC.77.034608
null
nucl-th
null
Because of thermal expansion and residual interactions, hot nuclear fragments produced in multifragmentation reactions may have lower nucleon density than the equilibrium density of cold nuclei. In terms of liquid-drop model this effect can be taken into account by reducing the bulk energy of fragments. We study the influence of this change on fragment yields and isotope distributions within the framework of the statistical multifragmentation model. Similarities and differences with previously discussed modifications of symmetry and surface energies of nuclei are analyzed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:42:44 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 09:55:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Buyukcizmeci", "N.", "" ], [ "Botvina", "A. S.", "" ], [ "Mishustin", "I. N.", "" ], [ "Ogul", "R.", "" ] ]
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711.3383
Genqian Liu
G. Liu
Solution of the Pompeiu problem (I)
This paper has been withdrawn
null
null
null
math.AP math.DG
null
This paper has been withdrawn by the author due to some errors.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:28:38 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 10:32:19 GMT" }, { "version": "v3", "created": "Tue, 27 Nov 2007 14:47:53 GMT" }, { "version": "v4", "created": "Wed, 12 Dec 2007 13:00:35 GMT" }, { "version": "v5", "created": "Mon, 17 Dec 2007 15:47:50 GMT" }, { "version": "v6", "created": "Thu, 27 Dec 2007 09:40:55 GMT" } ]
2007-12-27T00:00:00
[ [ "Liu", "G.", "" ] ]
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711.3384
Vaclav Janis
V Janis, A. Klic, M. Ringel
Replica-symmetry breaking: discrete and continuous schemes in the Sherrington-Kirkpatrick model
15 pages, 4 EPS figures
J. Phys. A: Math. Theor. 41, 324004 (2008)
10.1088/1751-8113/41/32/324004
null
cond-mat.dis-nn cond-mat.stat-mech
null
We study hierarchies of replica-symmetry-breaking solutions of the Sherrington-Kirkpatrick model. Stationarity equations for order parameters of solutions with an arbitrary number of hierarchies are set and the limit to infinite number of hierarchical levels is discussed. In particular, we demonstrate how the continuous replica-symmetry breaking scheme of Parisi emerges and how the limit to infinite-many hierarchies leads to equations for the order-parameter function of the continuous solution. The general analysis is accompanied by an explicit asymptotic solution near the de Almeida-Thouless instability line in the nonzero magnetic field.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:37:12 GMT" } ]
2008-09-16T00:00:00
[ [ "Janis", "V", "" ], [ "Klic", "A.", "" ], [ "Ringel", "M.", "" ] ]
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711.3385
Zhanyuan Hou Dr
Zhanyuan Hou
Global Attractor in Competitive Lotka-Volterra Systems
16 pages
null
null
null
math.DS math.CA
null
For autonomous Lotka-Volterra systems of differential equations modelling the dynamics of n competing species, new criteria are established for the existence of a single point global attractor. Under the conditions of these criteria, some of the species will survive and stabilise at a steady state whereas the others, if any, will die out.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:10:14 GMT" } ]
2007-11-22T00:00:00
[ [ "Hou", "Zhanyuan", "" ] ]
[ 0.0560410917, 0.0261020698, 0.101273872, 0.0221300162, -0.0312089976, -0.0263857879, -0.0228865985, 0.0123620052, -0.0646877363, 0.0334517211, 0.0204682387, -0.0555547178, -0.1132710949, -0.0402609557, -0.0249131564, 0.0196981467, 0.0245889071, 0.0009592376, 0.0229676608, 0.0537983663, -0.0087682419, -0.0725778043, 0.0713888928, -0.0181444511, -0.0216706637, -0.109758392, 0.0345325544, 0.0677140653, -0.0302092284, -0.0507990606, 0.0571219213, -0.033073429, -0.0597159155, 0.0254535712, -0.0226028804, 0.0976530835, 0.0289122313, 0.0583648793, -0.0798193738, -0.0187929496, 0.0479618795, -0.0318574943, -0.0195630416, 0.1535860896, 0.0619856603, 0.0098625831, -0.0179823264, -0.0156855602, 0.0048840055, 0.0289392527, -0.1224581599, 0.0192658138, 0.0199413337, -0.1403999627, -0.0236296691, -0.0529337004, 0.0451246984, 0.0913842693, 0.0605265386, -0.0085453205, 0.0148884477, -0.0554466322, 0.027101839, 0.0093897199, -0.0261020698, 0.009673438, -0.1168378368, -0.1051648632, -0.129807815, -0.0070794434, -0.0533660352, -0.1217015758, 0.0845750347, -0.0025568409, 0.0342623442, -0.0320736617, -0.0707403943, 0.0810082853, 0.0037457552, -0.0090249395, -0.0794951245, 0.0705242306, 0.0884119794, -0.055500675, -0.017617546, -0.1273218989, 0.0728480145, -0.0583648793, -0.1490465999, -0.0180363692, -0.0350729674, 0.0892766491, -0.0185227431, -0.0633907393, 0.0993824154, -0.0634988248, 0.0796032101, -0.0332355537, 0.0308847483, -0.0749556348, -0.1199722514, -0.1257006526, 0.0730101392, -0.0564734228, 0.131104812, -0.0133550186, -0.033073429, 0.0255346335, 0.0117067518, -0.0551494062, -0.052420307, -0.034316387, -0.0102206087, 0.0766849667, -0.0569597967, -0.0858179852, -0.0670655668, -0.059445709, -0.0049583125, 0.0039889421, 0.0406662673, -0.0468270071, 0.0131253423, -0.030803686, 0.0679302365, 0.0590674169, 0.0377480239, 0.0034079954, -0.1115417629, -0.0873851925, 0.0720914304, 0.0210491847, -0.0456380919, -0.0714969784, -0.1205126643, -0.0581487119, -0.0365320891, 0.0545549467, -0.0302902907, 0.0551223829, 0.076522842, -0.0149965314, -0.060364414, 0.0202250518, 0.0213193931, -0.0011238954, -0.0248185843, -0.0406392477, 0.01304428, 0.0434494093, 0.0823052824, -0.0307766646, 0.0380722731, 0.0570678823, 0.0474214628, -0.0096937036, -0.0492318571, 0.0429630354, -0.0196305942, -0.0405311659, 0.0892226025, 0.0005564591, 0.0345325544, -0.0458542593, 0.0560951307, 0.0245618857, -0.0674438551, -0.0692812726, -0.0622558706, -0.0360457152, 0.0931676403, -0.1099745631, -0.1307805628, -0.0349108428, 0.0226028804, 0.025507614, -0.0956535488, -0.1254844815, -0.0455840491, -0.0134563465, 0.0381263159, 0.0334247015, 0.0233324412, -0.1226743236, 0.0881958157, 0.0328302421, 0.0477186926, -0.0069004307, -0.0328572653, -0.0957616344, -0.018049879, 0.001987716, 0.0781440884, -0.0127875824, 0.0623639524, -0.1006253734, 0.0582567938, 0.0921948925, 0.0967343822, -0.0463406332, -0.0419632681, -0.0438547209, 0.110460937, -0.064309448, -0.0302902907, 0.0551223829, 0.053041786, 0.0420983694, -0.0534741171, -0.0801436231, 0.0499884374, -0.047070194, 0.0456921346, -0.1039759517, 0.0058635087, 0.0528256185, -0.1319694668, 0.1064078212, 0.0666872784, 0.1488304436, 0.016847454, 0.0480699614, -0.0218598079, 0.0143615426, -0.0144966468, -0.0775496289, 0.1143519282, -0.0738748014, 0.0437736586, -0.0586891286, 0.0605805814, 0.0592295416, 0.0140102729, -0.0811704099, -0.0832780376, -0.0881958157, -0.0446383245, -0.0373427123, -0.0034586594, -0.0091127567, -0.1347796321, -0.0037829087, 0.0340191573, -0.0529337004, -0.0107272482, -0.0205222797, -0.0366131514, 0.0251563434, -0.0809542462, -0.0453408621, 0.0817648694, -0.0536092222, 0.0696055219, 0.0519609526, 0.0104502859, 0.0319655798 ]
711.3386
William Y. C. Chen
William Y. C. Chen, Peter Paule and Husam L. Saad
Converging to Gosper's Algorithm
13 pages
null
null
null
math.CA math.CO
null
Given two polynomials, we find a convergence property of the GCD of the rising factorial and the falling factorial. Based on this property, we present a unified approach to computing the universal denominators as given by Gosper's algorithm and Abramov's algorithm for finding rational solutions to linear difference equations with polynomial coefficients.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:48:33 GMT" } ]
2007-11-22T00:00:00
[ [ "Chen", "William Y. C.", "" ], [ "Paule", "Peter", "" ], [ "Saad", "Husam L.", "" ] ]
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711.3387
Antonio Bernini
Antonio Bernini, Luca Ferrari and Renzo Pinzani
Enumeration of some classes of words avoiding two generalized patterns of length three
18 pages, 13 figures
null
null
null
math.CO
null
The method we have applied in "A. Bernini, L. Ferrari, R. Pinzani, Enumerating permutations avoiding three Babson-Steingrimsson patterns, Ann. Comb. 9 (2005), 137--162" to count pattern avoiding permutations is adapted to words. As an application, we enumerate several classes of words simultaneously avoiding two generalized patterns of length 3.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:05:18 GMT" } ]
2007-11-22T00:00:00
[ [ "Bernini", "Antonio", "" ], [ "Ferrari", "Luca", "" ], [ "Pinzani", "Renzo", "" ] ]
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711.3388
Shachar Lovett
Shachar Lovett, Roy Meshulam, Alex Samorodnitsky
Inverse Conjecture for the Gowers norm is false
20 pages
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $p$ be a fixed prime number, and $N$ be a large integer. The 'Inverse Conjecture for the Gowers norm' states that if the "$d$-th Gowers norm" of a function $f:\F_p^N \to \F_p$ is non-negligible, that is larger than a constant independent of $N$, then $f$ can be non-trivially approximated by a degree $d-1$ polynomial. The conjecture is known to hold for $d=2,3$ and for any prime $p$. In this paper we show the conjecture to be false for $p=2$ and for $d = 4$, by presenting an explicit function whose 4-th Gowers norm is non-negligible, but whose correlation any polynomial of degree 3 is exponentially small. Essentially the same result (with different correlation bounds) was independently obtained by Green and Tao \cite{gt07}. Their analysis uses a modification of a Ramsey-type argument of Alon and Beigel \cite{ab} to show inapproximability of certain functions by low-degree polynomials. We observe that a combination of our results with the argument of Alon and Beigel implies the inverse conjecture to be false for any prime $p$, for $d = p^2$.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:05:03 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 11:14:42 GMT" }, { "version": "v3", "created": "Mon, 20 Oct 2008 16:54:28 GMT" } ]
2008-10-20T00:00:00
[ [ "Lovett", "Shachar", "" ], [ "Meshulam", "Roy", "" ], [ "Samorodnitsky", "Alex", "" ] ]
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711.3389
Ralph Blumenhagen
Ralph Blumenhagen, Sebastian Moster, Erik Plauschinn
Moduli Stabilisation versus Chirality for MSSM like Type IIB Orientifolds
43 pages, 4 figures, v2: refs. added
JHEP0801:058,2008
10.1088/1126-6708/2008/01/058
MPP-2007-169
hep-th hep-ph
null
We investigate the general question of implementing a chiral MSSM like D-brane sector in Type IIB orientifold models with complete moduli stabilisation via F-terms induced by fluxes and space-time instantons, respectively gaugino condensates. The prototype examples are the KKLT and the so-called large volume compactifications. We show that the ansatz of first stabilising all moduli via F-terms and then introducing the Standard Model module is misleading, as a chiral sector notoriously influences the structure of non-perturbative effects and induces a D-term potential. Focusing for concreteness on the large volume scenario, we work out the geometry of the swiss-cheese type Calabi-Yau manifold P_[1,3,3,3,5][15]_(3,75) and analyse whether controllable and phenomenologically acceptable Kaehler moduli stabilisation can occur by the combination of F- and D-terms.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:05:35 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 13:21:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Blumenhagen", "Ralph", "" ], [ "Moster", "Sebastian", "" ], [ "Plauschinn", "Erik", "" ] ]
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711.339
Cosmo Lupo
Paolo Aniello, Cosmo Lupo
A class of inequalities inducing new separability criteria for bipartite quantum systems
examples added; references added; results improved; title slightly modified
J. Phys. A: Math. Theor. 41 (2008) 355303
10.1088/1751-8113/41/35/355303
null
quant-ph
null
Inspired by the realignment or computable cross norm criterion, we present a new result about the characterization of quantum entanglement. Precisely, an interesting class of inequalities satisfied by all separable states of a bipartite quantum system is derived. These inequalities induce new separability criteria that generalize the realignment criterion.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:05:38 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 17:44:54 GMT" }, { "version": "v3", "created": "Sun, 16 Mar 2008 21:29:33 GMT" } ]
2008-07-29T00:00:00
[ [ "Aniello", "Paolo", "" ], [ "Lupo", "Cosmo", "" ] ]
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711.3391
Jesper Lykke Jacobsen
Jesper Lykke Jacobsen (LPTMS, SPhT), Hubert Saleur (SPhT)
Exact valence bond entanglement entropy and probability distribution in the XXX spin chain and the Potts model
4 pages, 2 figures
null
10.1103/PhysRevLett.100.087205
null
cond-mat.stat-mech quant-ph
null
By relating the ground state of Temperley-Lieb hamiltonians to partition functions of 2D statistical mechanics systems on a half plane, and using a boundary Coulomb gas formalism, we obtain in closed form the valence bond entanglement entropy as well as the valence bond probability distribution in these ground states. We find in particular that for the XXX spin chain, the number N_c of valence bonds connecting a subsystem of size L to the outside goes, in the thermodynamic limit, as <N_c> = (4/pi^2) ln L, disproving a recent conjecture that this should be related with the von Neumann entropy, and thus equal to 1/(3 ln 2) ln L. Our results generalize to the Q-state Potts model.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:16:05 GMT" } ]
2013-05-29T00:00:00
[ [ "Jacobsen", "Jesper Lykke", "", "LPTMS, SPhT" ], [ "Saleur", "Hubert", "", "SPhT" ] ]
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711.3392
Magnus Paulsson
Magnus Paulsson, Thomas Frederiksen, Hiromu Ueba, Nicolas Lorente and Mads Brandbyge
Unified description of inelastic propensity rules for electron transport through nanoscale junctions
4 pages, 4 figures, 1 table http://link.aps.org/abstract/PRL/v100/e226604
PRL 100, 226604 (2008)
10.1103/PhysRevLett.100.226604
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a method to analyze the results of first-principles based calculations of electronic currents including inelastic electron-phonon effects. This method allows us to determine the electronic and vibrational symmeties in play, and hence to obtain the so-called propensity rules for the studied systems. We show that only a few scattering states -- namely those belonging to the most transmitting eigenchannels -- need to be considered for a complete description of the electron transport. We apply the method on first-principles calculations of four different systems and obtain the propensity rules in each case.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:17:35 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 14:59:33 GMT" } ]
2008-06-11T00:00:00
[ [ "Paulsson", "Magnus", "" ], [ "Frederiksen", "Thomas", "" ], [ "Ueba", "Hiromu", "" ], [ "Lorente", "Nicolas", "" ], [ "Brandbyge", "Mads", "" ] ]
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711.3393
Pierre Pizzochero
Pierre M. Pizzochero
Pinning and Binding Energies for Vortices in Neutron Stars: Comments on Recent Results
8 pages, 10 figures, EXOCT07 Conference Proceedings
null
10.1142/9789812797049_0062
null
astro-ph
null
We investigate when the energy that pins a superfluid vortex to the lattice of nuclei in the inner crust of neutron stars can be approximated by the energy that binds the vortex to a single nucleus. Indeed, although the pinning energy is the quantity relevant to the theory of pulsar glitches, so far full quantum calculations have been possible only for the binding energy. Physically, the presence of nearby nuclei can be neglected if the lattice is dilute, namely with nuclei sufficiently distant from each other. We find that the dilute limit is reached only for quite large Wigner-Seitz cells, with radii > 55 fm; these are found only in the outermost low-density regions of the inner crust. We conclude that present quantum calculations do not correspond to the pinning energies in almost the entire inner crust and thus their results are not predictive for the theory of glitches.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:17:59 GMT" } ]
2017-08-23T00:00:00
[ [ "Pizzochero", "Pierre M.", "" ] ]
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711.3394
Dirk Schlingemann
Dirk-M. Schlingemann, Marco Cozzini, Michael Keyl, Lorenzo Campos Venuti
Maximally entangled fermions
13 pages, 1 figure, RevTex, minor errors are corrected, section "Conclusions" is added
null
10.1103/PhysRevA.78.032301
null
quant-ph
null
Fermions play an essential role in many areas of quantum physics and it is desirable to understand the nature of entanglement within systems that consists of fermions. Whereas the issue of separability for bipartite fermions has extensively been studied in the present literature, this paper is concerned with maximally entangled fermions. A complete characterization of maximally entangled quasifree (gaussian) fermion states is given in terms of the covariance matrix. This result can be seen as a step towards distillation protocols for maximally entangled fermions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:18:50 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 14:15:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Schlingemann", "Dirk-M.", "" ], [ "Cozzini", "Marco", "" ], [ "Keyl", "Michael", "" ], [ "Venuti", "Lorenzo Campos", "" ] ]
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711.3395
Corinne Charbonnel
Corinne Charbonnel, Jean-Paul Zahn
Inhibition of thermohaline mixing by a magnetic field in Ap star descendants: Implications for the Galactic evolution of 3He
Accepted for publication in A&A Letters (Vol.476)
null
10.1051/0004-6361:20078740
null
astro-ph
null
To reconcile the measurements of 3He/H in Galactic HII regions with high values of 3He in a couple of planetary nebulae, we propose that thermohaline mixing is inhibited by a fossil magnetic field in red giant stars that are descendants of Ap stars. We examine the effect of a magnetic field on the salt-finger instability, using a local analysis. We obtain a threshold for the magnetic field of 10^4 - 10^5 Gauss, above which it inhibits thermohaline mixing in red giant stars located at or above the bump. Fields of that order are expected in the descendants of the Ap stars, taking into account the contraction of their core. We conclude that in a large fraction of the descendants of Ap stars thermohaline mixing does not occur. As a consequence these objects must produce 3He as predicted by the standard theory of stellar evolution and as observed in the planetary nebulae NGC3242 and J320. The relative number of such stars with respect to non-magnetic objects that undergo thermohaline mixing is consistent with the statistical constraint coming from observations of the carbon isotopic ratio in red giant stars. It also satisfies the Galactic requirements for the evolution of the 3He abundance.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:19:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Charbonnel", "Corinne", "" ], [ "Zahn", "Jean-Paul", "" ] ]
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711.3396
Thomas Walcher
Dieter Drechsel and Thomas Walcher
Hadron structure at low Q^2
55 pages, 47 figures, review
Rev.Mod.Phys.80:731-785,2008
10.1103/RevModPhys.80.731
null
hep-ph
null
This review deals with the structure of hadrons, strongly interacting many-body systems consisting of quarks and gluons. These systems have a size of about 1 fm, which shows up in scattering experiments at low momentum transfers $Q$ in the GeV region. At this scale the running coupling constant of Quantum Chromodynamics (QCD), the established theory of the strong interactions, becomes divergent. It is therefore highly intriguing to explore this theory in the realm of its strong interaction regime. However, the quarks and gluons can not be resolved at the GeV scale but have to be studied through their manifestations in the bound many-body systems, for instance pions, nucleons and their resonances. The review starts with a short overview of QCD at low momentum transfer and a summary of the theoretical apparatus describing the interaction of hadrons with electrons and photons. In the following sections we present the experimental results for the most significant observables studied with the electromagnetic probe: form factors, polarizabilities, excitation spectra, and sum rules. These experimental findings are compared and interpreted with various theoretical approaches to QCD, such as phenomenological models with quarks and pions, dispersion relations as a means to connect observables from different experiments, and, directly based on the QCD lagrangian, chiral perturbation theory and lattice gauge theory.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:59:29 GMT" } ]
2009-09-29T00:00:00
[ [ "Drechsel", "Dieter", "" ], [ "Walcher", "Thomas", "" ] ]
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711.3397
Marco Ruggieri
M. Ciminale, R. Gatto, N. D. Ippolito, G. Nardulli and M. Ruggieri
Three flavor Nambu-Jona Lasinio model with Polyakov loop and competition with nuclear matter
10 pages, 4 figures, RevTeX4 style
Phys.Rev.D77:054023,2008
10.1103/PhysRevD.77.054023
null
hep-ph
null
We study the phase diagram of the three flavor Polyakov-Nambu-Jona Lasinio (PNJL) model and in particular the interplay between chiral symmetry restoration and deconfinement crossover. We compute chiral condensates, quark densities and the Polyakov loop at several values of temperature and chemical potential. Moreover we investigate on the role of the Polyakov loop dynamics in the transition from nuclear matter to quark matter.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:34:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Ciminale", "M.", "" ], [ "Gatto", "R.", "" ], [ "Ippolito", "N. D.", "" ], [ "Nardulli", "G.", "" ], [ "Ruggieri", "M.", "" ] ]
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711.3398
Matthew Moulson
F. Ambrosino, A. Antonelli, E. Capitolo, P.S. Cooper, R. Fantechi, L. Iannotti, G. Lamanna, E. Leonardi, M. Moulson, M. Napolitano, V. Palladino, M. Raggi, A. Romano, G. Saracino, M. Serra, T. Spadaro, P. Valente, S. Venditti
A prototype large-angle photon veto detector for the P326 experiment at CERN
8 pages, 9 figures, 2 tables. Presented at the 2007 IEEE Nuclear Science Symposium, Honolulu HI, USA, 28 October - 3 November 2007
null
10.1109/NSSMIC.2007.4436288
null
physics.ins-det
null
The P326 experiment at the CERN SPS has been proposed with the purpose of measuring the branching ratio for the decay K^+ \to \pi^+ \nu \bar{\nu} to within 10%. The photon veto system must provide a rejection factor of 10^8 for \pi^0 decays. We have explored two designs for the large-angle veto detectors, one based on scintillating tiles and the other using scintillating fibers. We have constructed a prototype module based on the fiber solution and evaluated its performance using low-energy electron beams from the Frascati Beam-Test Facility. For comparison, we have also tested a tile prototype constructed for the CKM experiment, as well as lead-glass modules from the OPAL electromagnetic barrel calorimeter. We present results on the linearity, energy resolution, and time resolution obtained with the fiber prototype, and compare the detection efficiency for electrons obtained with all three instruments.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:37:17 GMT" } ]
2016-11-17T00:00:00
[ [ "Ambrosino", "F.", "" ], [ "Antonelli", "A.", "" ], [ "Capitolo", "E.", "" ], [ "Cooper", "P. S.", "" ], [ "Fantechi", "R.", "" ], [ "Iannotti", "L.", "" ], [ "Lamanna", "G.", "" ], [ "Leonardi", "E.", "" ], [ "Moulson", "M.", "" ], [ "Napolitano", "M.", "" ], [ "Palladino", "V.", "" ], [ "Raggi", "M.", "" ], [ "Romano", "A.", "" ], [ "Saracino", "G.", "" ], [ "Serra", "M.", "" ], [ "Spadaro", "T.", "" ], [ "Valente", "P.", "" ], [ "Venditti", "S.", "" ] ]
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711.3399
Ricardo Dur\'an
Irene Drelichman, Ricardo G. Dur\'an
Improved Poincare inequalities with weights
null
null
10.1016/j.jmaa.2008.06.005
null
math.CA
null
In this paper we prove that if $\Omega\in\mathbb{R}^n$ is a bounded John domain, the following weighted Poincare-type inequality holds: $$ \inf_{a\in \mathbb{R}}\| (f(x)-a) w_1(x) \|_{L^q(\Omega)} \le C \|\nabla f(x) d(x)^\alpha w_2(x) \|_{L^p(\Omega)} $$ where $f$ is a locally Lipschitz function on $\Omega$, $d(x)$ denotes the distance of $x$ to the boundary of $\Omega$, the weights $w_1, w_2$ satisfy certain cube conditions, and $\alpha \in [0,1]$ depends on $p,q$ and $n$. This result generalizes previously known weighted inequalities, which can also be obtained with our approach.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:48:24 GMT" } ]
2015-05-13T00:00:00
[ [ "Drelichman", "Irene", "" ], [ "Durán", "Ricardo G.", "" ] ]
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711.34
Iosif Pinelis
Iosif Pinelis
On the Non-degeneracy of Kendall's and Spearman's Correlation Coefficients
4 pages; to the statements in version 1 on Kendall's correlation statistic now added quite similar statements on Spearman's one; accordingly changed the title and abstract
null
null
null
math.ST math.GM stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hoeffding proved that Kendall's and Spearman's nonparametric measures of correlation between two continuous random variables X and Y are each asymptotically normal with an asymptotic variance of the form sigma^2/n -- provided the non-degeneracy condition sigma^2>0 holds, where sigma^2 is a certain (always nonnegative) expression which is determined by the joint distribution (say mu) of X and Y. Sufficient conditions for sigma^2>0 in terms of the support set (say S) of mu are given, the same for both correlation statistics. One of them is that there exist a rectangle with all its vertices in S, sides parallel to the X and Y axes, and an interior point also in S. Another sufficient condition is that the Lebesgue measure of S be nonzero.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:59:23 GMT" }, { "version": "v2", "created": "Tue, 19 Jan 2010 21:54:43 GMT" } ]
2010-01-19T00:00:00
[ [ "Pinelis", "Iosif", "" ] ]
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711.3401
Eduardo Zambrano
Eduardo Zambrano, Alfredo M Ozorio de Almeida
Uniform approximation for the overlap caustic of a quantum state with its translations
14 pages, 9 figures
Nonlinearity 21 783 (2008)
10.1088/0951-7715/21/4/007
null
quant-ph
null
The semiclassical Wigner function for a Bohr-quantized energy eigenstate is known to have a caustic along the corresponding classical closed phase space curve in the case of a single degree of freedom. Its Fourier transform, the semiclassical chord function, also has a caustic along the conjugate curve defined as the locus of diameters, i.e. the maximal chords of the original curve. If the latter is convex, so is its conjugate, resulting in a simple fold caustic. The uniform approximation through this caustic, that is here derived, describes the transition undergone by the overlap of the state with its translation, from an oscillatory regime for small chords, to evanescent overlaps, rising to a maximum near the caustic. The diameter-caustic for the Wigner function is also treated.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:02:18 GMT" } ]
2010-03-10T00:00:00
[ [ "Zambrano", "Eduardo", "" ], [ "de Almeida", "Alfredo M Ozorio", "" ] ]
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711.3402
Benjamin Stephens
Benjamin K. Stephens
Thread-wire surfaces: Near-wire minimizers and topological finiteness (superseded)
Per referee comments, this article has been split; it is now superseded by "Existence of thread-wire minimizers" and "Near-wire thread-wire minimizers"; please see http://www.bkstephens.net
null
null
null
math.AP math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
(NOTE: per referee comments, this article has been split; it is now superseded by "Existence of thread-wire minimizers" and "Near-wire thread-wire minimizers"; please see http://www.bkstephens.net.) Alt's thread problem asks for least-area surfaces bounding a fixed "wire" curve and a movable "thread" curve of length L. We conjecture that if the wire has finitely many maxima of curvature, then its Alt minimizers have finitely many surface components. We show that this conjecture reduces to controlling near-wire minimizers, and thus begin a three paper series to understand them. In this paper we show they arise, show that they are embedded, and show that they have a nice parametrization in wire exponential coordinates. In doing so we prove tools of independent interest: a weighted isoperimetric inequality, a nonconvex enclosure theorem, and a classification of how Alt minimizers intersect planes. The last item reduces to a question about harmonic functions in the spirit of Rado's lemma.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:23:27 GMT" }, { "version": "v2", "created": "Tue, 28 Oct 2008 20:45:33 GMT" } ]
2008-10-29T00:00:00
[ [ "Stephens", "Benjamin K.", "" ] ]
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711.3403
Dongho Chae
Dongho Chae
On the a priori estimates for the Euler, the Navier-Stokes and the quasi-geostrophic equations
null
null
null
null
math.AP
null
We prove new \emph{a priori} estimates for the 3D Euler, the 3D Navier-Stokes and the 2D quasi-geostrophic equations by the method of similarity transforms.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:15:26 GMT" } ]
2007-11-22T00:00:00
[ [ "Chae", "Dongho", "" ] ]
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711.3404
Rafael Hernandez
Cesar Gomez, Johan Gunnesson, Rafael Hernandez
The Ising model and planar N=4 Yang-Mills
24 pages. v2: References added and minor typos corrected
J.Phys.A41:275205,2008
10.1088/1751-8113/41/27/275205
null
hep-th
null
The scattering-matrix for planar Yang-Mills with N=4 supersymmetry relies on the assumption that integrability holds to all orders in perturbation theory. In this note we define a map from the spectral variables x^{\pm}, parameterizing the long-range magnon momenta, to couplings in a two-dimensional Ising model. Under this map integrability of planar N=4 Yang-Mills becomes equivalent to the Yang-Baxter equation for the two-dimensional Ising model, and the long-range variables x^{\pm} translate into the entries of the Ising transfer matrices. We explore the Ising correlation length which equals the inverse magnon momentum in the small momentum limit. The critical regime is thus reached for vanishing magnon momentum. We also discuss the meaning of the Kramers-Wannier duality transformation on the gauge theory, together with that of the Ising model critical points.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:26:15 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 16:40:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Gomez", "Cesar", "" ], [ "Gunnesson", "Johan", "" ], [ "Hernandez", "Rafael", "" ] ]
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711.3405
Gabor Wiese
Koopa Tak-Lun Koo, William Stein and Gabor Wiese
On the generation of the coefficient field of a newform by a single Hecke eigenvalue
13 pages, more complete result, some corollaries added
null
null
null
math.NT
null
Let f be a non-CM newform of weight k > 1. Let L be a subfield of the coefficient field of f. We completely settle the question of the density of the set of primes p such that the p-th coefficient of f generates the field L. This density is determined by the inner twists of f. As a particular case, we obtain that in the absence of non-trivial inner twists, the density is 1 for L equal to the whole coefficient field. We also present some new data on reducibility of Hecke polynomials, which suggest questions for further investigation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:19:14 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 09:11:07 GMT" } ]
2008-02-25T00:00:00
[ [ "Koo", "Koopa Tak-Lun", "" ], [ "Stein", "William", "" ], [ "Wiese", "Gabor", "" ] ]
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711.3406
Chiara Menotti
Chiara Menotti and Maciej Lewenstein
Ultra-cold dipolar gases
11 pages, 11 figures, to be published in the Proceedings of the RPMBT14 conference (Barcelona, July 2007), Series on Advances in Quantum Many-Body Theory, World Scientific
null
10.1142/9789812779885_0010
null
cond-mat.other
null
We present a concise review of the physics of ultra-cold dipolar gases, based mainly on the theoretical developments in our own group. First, we discuss shortly weakly interacting ultra-cold trapped dipolar gases. Dipolar Bose-Einstein condensates exhibit non-standard instabilities and the physics of both Bose and Fermi dipolar gases depends on the trap geometry. We focus then the second part of the paper on strongly correlated dipolar gases and discuss ultra-cold dipolar gases in optical lattices. Such gases exhibit a spectacular richness of quantum phases and metastable states, which may perhaps be used as quantum memories. We comment shortly on the possibility of superchemistry aiming at the creation of dipolar heteronuclear molecules in lattices. Finally, we turn to ultra-cold dipolar gases in artificial magnetic fields, and consider rotating dipolar gases, that provide in our opinion the best option towards the realization of the fractional quantum Hall effect and quantum Wigner crystals.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:42:21 GMT" } ]
2017-08-23T00:00:00
[ [ "Menotti", "Chiara", "" ], [ "Lewenstein", "Maciej", "" ] ]
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711.3407
Patrick Valageas
P. Valageas
Expansion schemes for gravitational clustering: computing two-point and three-point functions
24 pages, published in A&A
Astron. Astrophys. (2008), 484, 79
10.1051/0004-6361:20079071
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe various expansion schemes that can be used to study gravitational clustering. Obtained from the equations of motion or their path-integral formulation, they provide several perturbative expansions that are organized in different fashion or involve different partial resummations. We focus on the two-point and three-point correlation functions, but these methods also apply to all higher-order correlation and response functions. We present the general formalism, which holds for the gravitational dynamics as well as for similar models, such as the Zeldovich dynamics, that obey similar hydrodynamical equations of motion with a quadratic nonlinearity. We give our explicit analytical results up to one-loop order for the simpler Zeldovich dynamics. For the gravitational dynamics, we compare our one-loop numerical results with numerical simulations. We check that the standard perturbation theory is recovered from the path integral by expanding over Feynman's diagrams. However, the latter expansion is organized in a different fashion and it contains some UV divergences that cancel out as we sum all diagrams of a given order. Resummation schemes modify the scaling of tree and one-loop diagrams, which exhibit the same scaling over the linear power spectrum (contrary to the standard expansion). However, they do not significantly improve over standard perturbation theory for the bispectrum, unless one uses accurate two-point functions (e.g. a fit to the nonlinear power spectrum from simulations). Extending the range of validity to smaller scales, to reach the range described by phenomenological models, seems to require at least two-loop diagrams.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:33:39 GMT" }, { "version": "v2", "created": "Fri, 24 Oct 2008 12:59:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Valageas", "P.", "" ] ]
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