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711.3208
Man Yue Mo
M. Y. Mo
The Riemann-Hilbert approach to double scaling limit of random matrix eigenvalues near the "birth of a cut" transition
41 pages, 3 figures
null
null
null
math-ph math.MP
null
In this paper we studied the double scaling limit of a random unitary matrix ensemble near a singular point where a new cut is emerging from the support of the equilibrium measure. We obtained the asymptotic of the correlation kernel by using the Riemann-Hilbert approach. We have shown that the kernel near the critical point is given by the correlation kernel of a random unitary matrix ensemble with weight $e^{-x^{2\nu}}$. This provides a rigorous proof of the previous results of Eynard.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:22:15 GMT" } ]
2007-11-22T00:00:00
[ [ "Mo", "M. Y.", "" ] ]
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711.3209
Yutaka Fujita
Yutaka Fujita (Osaka U.)
Influence of AGN Outbursts on the Surrounding Galaxies
Accepted for publication in MNRAS Letters
null
10.1111/j.1745-3933.2007.00422.x
OU-TAP 285
astro-ph
null
We study the influence of a strong AGN outburst on the surrounding galaxies. The AGN is assumed to reside in a group of galaxies, and an outburst excites a shock wave in the hot gas in the group. We calculate the impact of the shock wave on the galaxies. We find that if the energy of the outburst is extremely large (E_AGN ~6x10^61 erg) as the one recently observed in clusters, the impact is strong enough to strip the cold interstellar medium in the disc of the galaxies in the inner region of the group. Moreover, even in the outer region of the group, the warm gas in the halo of the galaxies would be stripped, even if the energy of the outburst is ~6x10^60 erg. These would decrease star formation activity of the galaxies. If these galaxies fall into the group centre through dynamical friction and their interstellar medium is the fuel of the supermassive black hole in the AGN, the outburst would serve as feedback. While this mechanism works only when E_AGN is extremely large, such outbursts have not been observed in groups at low redshift; it would work at high redshift rather than at low redshift.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:00:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Fujita", "Yutaka", "", "Osaka U." ] ]
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711.321
Nemanja Kaloper
Nemanja Kaloper
Brane Induced Gravity: Codimension-2
16 pages latex, 2 .eps figs, based on the talks given at the "Sowers Workshop", Virginia Tech, May 14-18, 2007, "Cosmology and Strings" workshop at ICTP, Trieste, Italy, July 9-13, 2007, "Dark Energy In the Universe", Hakone, Japan, Sep 1-4, 2007 and "Zagreb Workshop 2007", Zagreb, Croatia, Nov 9-11, 2007; v2: added references
Mod.Phys.Lett.A23:781-796,2008
10.1142/S0217732308026819
null
hep-th astro-ph gr-qc hep-ph
null
We review the results of arXiv:hep-th/0703190, on brane induced gravity (BIG) in 6D. Among a large diversity of regulated codimension-2 branes, we find that for near-critical tensions branes live inside very deep throats which efficiently compactify the angular dimension. In there, 4D gravity first changes to 5D, and only later to 6D. The crossover from 4D to 5D is independent of the tension, but the crossover from 5D to 6D is not. This shows how the vacuum energy problem manifests in BIG: instead of tuning vacuum energy to adjust the 4D curvature, generically one must tune it to get the desired crossover scales and the hierarchy between the scales governing the 4D \to 5D \to 6D transitions. In the near-critical limit, linearized perturbation theory remains under control below the crossover scale, and we find that linearized gravity around the vacuum looks like a scalar-tensor theory.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:16:03 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 17:23:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Kaloper", "Nemanja", "" ] ]
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711.3211
Herman Verlinde
Radovan Dermisek, Herman Verlinde, and Lian-Tao Wang
Hypercharged Anomaly Mediation
4 pages, 3 figures, minor modifications to match the version published in PRL
Phys.Rev.Lett.100:131804,2008
10.1103/PhysRevLett.100.131804
null
hep-ph hep-th
null
We show that, in string models with the MSSM residing on D-branes, the bino mass can be generated in a geometrically separated hidden sector. Hypercharge mediation thus naturally teams up with anomaly mediation. The mixed scenario predicts a distinctive yet viable superpartner spectrum, provided that the ratio \alpha between the bino and gravitino mass lies in the range 0.05 < |\alpha| < 0.25, and m_{3/2} > 35 TeV. We summarize some of the phenomenological features of this scenario.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:01:05 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 00:55:48 GMT" }, { "version": "v3", "created": "Mon, 31 Mar 2008 19:25:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Dermisek", "Radovan", "" ], [ "Verlinde", "Herman", "" ], [ "Wang", "Lian-Tao", "" ] ]
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711.3212
Yangsen Yao
Yangsen Yao, Michael A. Nowak, Q. Daniel Wang, Norbert S. Schulz, Claude R. Canizares
Limits on Hot Galactic Halo Gas from X-ray Absorption Lines
4 pages, Accepted for publication in the ApJ Letters, no change except for fixing a typo in an author's name
null
10.1086/526767
null
astro-ph
null
Although the existence of large-scale hot gaseous halos around massive disk galaxies have been theorized for a long time, there is yet very little observational evidence. We report the Chandra and XMM-Newton grating spectral detection of OVII and NeIX Kalpha absorption lines along the sight-line of 4U 1957+11. The line absorption is consistent with the interstellar medium in origin. Attributing these line absorptions to the hot gas associated with the Galactic disk, we search for the gaseous halo around the Milky Way by comparing this sight-line with more distant ones (toward X-ray binary LMC X-3 and the AGN Mrk 421). We find that all the line absorptions along the LMC X-3 and Mrk 421 sight-lines are attributable to the hot gas in a thick Galactic disk, as traced by the absorption lines in the spectra of 4U~1957+11 after a Galactic latitude dependent correction. We constrain the OVII column density through the halo to be N(OVII) < 5E15 cm^{-2} (95% confidence limit), and conclude that the hot gas contribution to the metal line absorptions, if existing, is negligible.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:02:09 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 02:51:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Yao", "Yangsen", "" ], [ "Nowak", "Michael A.", "" ], [ "Wang", "Q. Daniel", "" ], [ "Schulz", "Norbert S.", "" ], [ "Canizares", "Claude R.", "" ] ]
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711.3213
Matthew Wyczalkowski
Matthew A. Wyczalkowski and Rohit V. Pappu
Satisfying the fluctuation theorem in free energy calculations with Hamiltonian replica exchange
12 pages, 1 table, 4 figures
null
10.1103/PhysRevE.77.026104
null
cond-mat.stat-mech cond-mat.soft
null
A novel error measure, referred to as the hysteresis error, is developed from the Crooks fluctuation theorem to evaluate sampling quality in free energy calculations. Theory and numerical free energy of hydration calculations are used to show that Hamiltonian replica exchange provides a direct route for minimizing the hysteresis error. Replica exchange swap probabilies yield the rate at which the hysteresis error falls with simulation length, and this result can be used to decrease bias and statistical errors associated with free energy calculations based on multicanonical simulations.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:09:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Wyczalkowski", "Matthew A.", "" ], [ "Pappu", "Rohit V.", "" ] ]
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711.3214
Herman Verlinde
Herman Verlinde, Lian-Tao Wang, Martijn Wijnholt, Itay Yavin
A Higher Form (of) Mediation
20 pages, 4 figures
JHEP0802:082,2008
10.1088/1126-6708/2008/02/082
PUPT 2251
hep-th hep-ph
null
We exhibit a simple and robust mechanism for mediation of supersymmetry breaking between geometrically separated D-branes in type II string theory. The mediation proceeds via RR p-forms that couple via linear Chern-Simons terms to the abelian vector bosons on the branes. From a 4-d low energy perspective, the mechanism reduces to U(1) mediation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 03:07:39 GMT" }, { "version": "v2", "created": "Sun, 24 Feb 2008 20:16:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Verlinde", "Herman", "" ], [ "Wang", "Lian-Tao", "" ], [ "Wijnholt", "Martijn", "" ], [ "Yavin", "Itay", "" ] ]
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711.3215
Igor Strakovsky
Ya. Azimov (PNPI), K. Goeke (Ruhr-Univ.), I. Strakovsky (GWU)
How is Exotics Produced ? Where to Search for it ?
Presented at MeNu2007, Sep 10-14, 2007, Juelich, Germany; Latex, 4 pages, uses conference.cls and Header.eps (included)
ECONF C070910:206,2007
null
null
hep-ph
null
On the basis of existing data, we suggest such a mechanism of production for exotic hadrons that can explain, at least qualitatively, why the Theta+-baryon is seen in some experiments and not in others. With our hypothesis, production of exotic hadrons is a new kind of hard processes. We also can propose new experiments to check (and confirm?) existence of exotics and to provide new important information about both exotic and conventional hadrons [The talk is based on the papers by Ya. Azimov, K. Goeke, and I. Strakovsky, Phys Rev D 76, 074013 (2007)]
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:25:37 GMT" } ]
2014-11-18T00:00:00
[ [ "Azimov", "Ya.", "", "PNPI" ], [ "Goeke", "K.", "", "Ruhr-Univ." ], [ "Strakovsky", "I.", "", "GWU" ] ]
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711.3216
Sourin Das
Arijit Saha and Sourin Das
Quantized charge pumping in superconducting double barrier structure : Non-trivial correlations due to proximity effect
Final version to appear in Phys. Rev. B
Phys. Rev. B 78, 075412 (2008)
10.1103/PhysRevB.78.075412
null
cond-mat.mes-hall cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider quantum charge pumping of electrons across a superconducting double barrier structure in the adiabatic limit. The superconducting barriers are assumed to be reflection-less so that an incident electron on the barrier can either tunnel through it or Andreev reflect from it. In this structure, quantum charge pumping can be achieved (a) by modulating the amplitudes, $\Delta_1$ and $\Delta_2$ of the two superconducting gaps or alternatively, (b) by a periodic modulation of the order parameter phases, $\phi_1$ and $\phi_2$ of the superconducting barriers. In the former case, we show that the superconducting gap gives rise to a very sharp resonance in the transmission resulting in quantization of pumped charge, when the pumping contour encloses the resonance. On the other hand, we find that quantization is hard to achieve in the latter case. We show that inclusion of weak electron-electron interaction in the quantum wire leads to renormalisation group evolution of the transmission amplitude towards the perfectly transmitting limit due to proximity effects. Hence as we approach the zero temperature limit, we get destruction of quantized pumped charge. This is in sharp contrast to the case of charge pumping in a double barrier in a Luttinger liquid where quantized charge pumping is actually achieved in the zero temperature limit. We also propose an experimental set-up to study these effects.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:20:33 GMT" }, { "version": "v2", "created": "Sun, 27 Jul 2008 07:24:35 GMT" }, { "version": "v3", "created": "Tue, 12 Aug 2008 20:55:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Saha", "Arijit", "" ], [ "Das", "Sourin", "" ] ]
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711.3217
Robert Blair
Robert Blair, John Dawson, Gary Drake, William Haberichter, James Schlereth, Jinlong Zhang, Maris Abolins, Yuri Ermoline, Bernard Pope
The ATLAS High Level Trigger Region of Interest Builder
13 pages, 7 figures
JINST 3:P04001,2008
10.1088/1748-0221/3/04/P04001
ATL-DAQ-PUB-2007-001
physics.ins-det
null
This article describes the design, testing and production of the ATLAS Region of Interest Builder (RoIB). This device acts as an interface between the Level 1 trigger and the high level trigger (HLT) farm for the ATLAS LHC detector. It distributes all of the level 1 data for a subset of events to a small number of (16 or less) individual commodity processors. These processors in turn provide this information to the HLT. This allows the HLT to use the level 1 information to narrow data requests to areas of the detector where level 1 has identified interesting objects.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:33:38 GMT" } ]
2009-04-17T00:00:00
[ [ "Blair", "Robert", "" ], [ "Dawson", "John", "" ], [ "Drake", "Gary", "" ], [ "Haberichter", "William", "" ], [ "Schlereth", "James", "" ], [ "Zhang", "Jinlong", "" ], [ "Abolins", "Maris", "" ], [ "Ermoline", "Yuri", "" ], [ "Pope", "Bernard", "" ] ]
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711.3218
Vasiliy Krivtsov
Mark Kaminskiy, Vasiliy Krivtsov
An Integral Measure of Aging/Rejuvenation for Repairable and Non-repairable Systems
12 pages, 2 figures, 3 tables
null
null
null
stat.ME
null
This paper introduces a simple index that helps to assess the degree of aging or rejuvenation of a (non)repairable system. The index ranges from -1 to 1 and is negative for the class of decreasing failure rate distributions (or deteriorating point processes) and is positive for the increasing failure rate distributions (or improving point processes). The introduced index is distribution free.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:08:11 GMT" } ]
2007-11-22T00:00:00
[ [ "Kaminskiy", "Mark", "" ], [ "Krivtsov", "Vasiliy", "" ] ]
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711.3219
Stephen Doty
Stephen Doty and Kathryn Nyman
Annihilators of permutation modules
18 pages
null
null
null
math.RT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Permutation modules are fundamental in the representation theory of symmetric groups $\Sym_n$ and their corresponding Iwahori--Hecke algebras $\He = \He(\Sym_n)$. We find an explicit combinatorial basis for the annihilator of a permutation module in the "integral" case -- showing that it is a cell ideal in G.E. Murphy's cell structure of $\He$. The same result holds whenever $\He$ is semisimple, but may fail in the non-semisimple case.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:45:46 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 11:42:27 GMT" }, { "version": "v3", "created": "Thu, 1 Jan 2009 22:24:26 GMT" }, { "version": "v4", "created": "Thu, 30 Apr 2009 16:50:45 GMT" }, { "version": "v5", "created": "Tue, 30 Jun 2009 15:32:37 GMT" } ]
2009-06-30T00:00:00
[ [ "Doty", "Stephen", "" ], [ "Nyman", "Kathryn", "" ] ]
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711.322
Diego Saa
Diego Saa
Fourvector algebra
24 pages, 4 figures, first version
null
null
null
math-ph math.MP
null
The algebra of fourvectors is described. The fourvectors are more appropriate than the Hamilton quaternions for its use in Physics and the sciences in general. The fourvectors embrace the 3D vectors in a natural form. It is shown the excellent ability to perform rotations with the use of fourvectors, as well as their use in relativity for producing Lorentz boosts, which are understood as simple rotations.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:50:18 GMT" } ]
2007-11-22T00:00:00
[ [ "Saa", "Diego", "" ] ]
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711.3221
Scott Wolpert
Mark Pollicott, Howard Weiss and Scott A. Wolpert
Topological dynamics of the Weil-Petersson geodesic flow
null
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove topological transitivity for the Weil Petersson geodesic flow for two-dimensional moduli spaces of hyperbolic structures. Our proof follows a new approach that exploits the density of singular unit tangent vectors, the geometry of cusps and convexity properties of negative curvature. We also show that the Weil Petersson geodesic flow has: horseshoes, invariant sets with positive topological entropy, and that there are infinitely many hyperbolic closed geodesics, whose number grows exponentially in length. Furthermore, we note that the volume entropy is infinite.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:57:26 GMT" }, { "version": "v2", "created": "Mon, 5 Oct 2009 13:38:38 GMT" } ]
2009-10-05T00:00:00
[ [ "Pollicott", "Mark", "" ], [ "Weiss", "Howard", "" ], [ "Wolpert", "Scott A.", "" ] ]
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711.3222
Michele Arzano
Michele Arzano
Quantum fields, Noether charges and \kappa-spacetime symmetries
13 pages, no figures. To appear in the proceedings of the workshop "From Quantum to Emergent Gravity: Theory and Phenomenology", Trieste, Italy, June 11-15 2007
PoSQG-Ph:005,2007
null
null
hep-th
null
We discuss how the symmetries of $\kappa$-Minkowski non-commutative spacetime can be described by the $\kappa$-Poincar\'e Hopf algebra. In particular, we focus on a generalization of the Noether analysis in the $\kappa$-deformed framework which allows us to introduce Noether charges associated with translational symmetries and makes possible to overcome the apparent ambiguities that seemed to be associated with the action of such symmetries. Moving from the classical to the quantum framework, we will first review past results on path integral quantization of a scalar self-interacting field. We will then show how recent work on the symplectic structure of classical $\kappa$-fields suggests a new approach to the canonical quantization of free fields and and present some new results.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 22:06:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Arzano", "Michele", "" ] ]
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711.3223
Sergey Kulagin
A. V. Butkevich and S. A. Kulagin
QE Neutrino CC Cross Sections off 16O
3 pages, to appear in the proceedings of 5th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt07), Batavia, Illinois, 30 May - 3 Jun 2007
AIP Conf.Proc.967:298-300,2007
10.1063/1.2834496
null
nucl-th
null
The charged-current quasi-elastic scattering of muon neutrino on oxygen target is computed for neutrino energy between 200 MeV and 2.5 GeV using different approximations: the Plane Wave Impulse Approximation (PWIA), the Relativistic Distorted Wave Impulse Approximation with relativistic optical potential (RDWIA), and the Relativistic Fermi Gas Model (RFGM). The comparison with RFGM, which is widely used in data analyses of neutrino experiments, shows that the RFGM fails completely when applied to exclusive cross section data and leads to overestimated values of inclusive and total cross sections.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 22:07:37 GMT" } ]
2014-11-18T00:00:00
[ [ "Butkevich", "A. V.", "" ], [ "Kulagin", "S. A.", "" ] ]
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711.3224
Jun-Muk Hwang
Jun-Muk Hwang
Base manifolds for fibrations of projective irreducible symplectic manifolds
null
null
10.1007/s00222-008-0143-9
null
math.AG
null
Given a projective irreducible symplectic manifold $M$ of dimension $2n$, a projective manifold $X$ and a surjective holomorphic map $f:M \to X$ with connected fibers of positive dimension, we prove that $X$ is biholomorphic to the projective space of dimension $n$. The proof is obtained by exploiting two geometric structures at general points of $X$: the affine structure arising from the action variables of the Lagrangian fibration $f$ and the structure defined by the variety of minimal rational tangents on the Fano manifold $X$.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 22:13:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Hwang", "Jun-Muk", "" ] ]
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711.3225
Hyoungsoon Choi
H. Choi, J.P. Davis, J. Pollanen, T.M. Haard and W.P. Halperin
Strong Coupling Corrections to the Ginzburg-Landau Theory of Superfluid ^{3}He
9 pages, 7 figures, 2 tables
null
10.1103/PhysRevB.75.174503
null
cond-mat.supr-con
null
In the Ginzburg-Landau theory of superfluid $^{3}$He, the free energy is expressed as an expansion of invariants of a complex order parameter. Strong coupling effects, which increase with increasing pressure, are embodied in the set of coefficients of these order parameter invariants\cite{Leg75,Thu87}. Experiments can be used to determine four independent combinations of the coefficients of the five fourth order invariants. This leaves the phenomenological description of the thermodynamics near $T_{c}$ incomplete. Theoretical understanding of these coefficients is also quite limited. We analyze our measurements of the magnetic susceptibility and the NMR frequency shift in the $B$-phase which refine the four experimental inputs to the phenomenological theory. We propose a model based on existing experiments, combined with calculations by Sauls and Serene\cite{Sau81} of the pressure dependence of these coefficients, in order to determine all five fourth order terms. This model leads us to a better understanding of the thermodynamics of superfluid $^{3}$He in its various states. We discuss the surface tension of bulk superfluid $^{3}$He and predictions for novel states of the superfluid such as those that are stabilized by elastic scattering of quasiparticles from a highly porous silica aerogel.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 22:26:48 GMT" } ]
2007-11-22T00:00:00
[ [ "Choi", "H.", "" ], [ "Davis", "J. P.", "" ], [ "Pollanen", "J.", "" ], [ "Haard", "T. M.", "" ], [ "Halperin", "W. P.", "" ] ]
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711.3226
Riccardo Ricci
Nadav Drukker, Simone Giombi, Riccardo Ricci, Diego Trancanelli
Supersymmetric Wilson loops on S^3
Latex, 84 pages, 4 figures. v2: minor changes, references added; to appear in JHEP
JHEP0805:017,2008
10.1088/1126-6708/2008/05/017
null
hep-th
null
This paper studies in great detail a family of supersymmetric Wilson loop operators in N=4 supersymmetric Yang-Mills theory we have recently found. For a generic curve on an S^3 in space-time the loops preserve two supercharges but we will also study special cases which preserve 4, 8 and 16 supercharges. For certain loops we find the string theory dual explicitly and for the general case we show that string solutions satisfy a first order differential equation. This equation expresses the fact that the strings are pseudo-holomorphic with respect to a novel almost complex structure we construct on AdS_4 x S^2. We then discuss loops restricted to S^2 and provide evidence that they can be calculated in terms of similar observables in purely bosonic YM in two dimensions on the sphere.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 22:21:19 GMT" }, { "version": "v2", "created": "Sun, 27 Apr 2008 21:16:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Drukker", "Nadav", "" ], [ "Giombi", "Simone", "" ], [ "Ricci", "Riccardo", "" ], [ "Trancanelli", "Diego", "" ] ]
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711.3227
Patrick Dufour
P. Dufour, James Liebert, G. Fontaine, and N. Behara
Rare White dwarf stars with carbon atmospheres
7 pages, 1 figure, to appear in Nov 22nd 2007 edition of Nature
null
10.1038/nature06318
null
astro-ph
null
White dwarfs represent the endpoint of stellar evolution for stars with initial masses between approximately 0.07 msun and 8-10 msun, where msun is the mass of the Sun (more massive stars end their life as either black holes or neutron stars). The theory of stellar evolution predicts that the majority of white dwarfs have a core made of carbon and oxygen, which itself is surrounded by a helium layer and, for ~80 per cent of known white dwarfs, by an additional hydrogen layer. All white dwarfs therefore have been traditionally found to belong to one of two categories: those with a hydrogen-rich atmosphere (the DA spectral type) and those with a helium-rich atmosphere (the non-DAs). Here we report the discovery of several white dwarfs with atmospheres primarily composed of carbon, with little or no trace of hydrogen or helium. Our analysis shows that the atmospheric parameters found for these stars do not fit satisfactorily in any of the currently known theories of post-asymptotic giant branch evolution, although these objects might be the cooler counterpart of the unique and extensively studied PG1159 star H1504+65. These stars, together with H1504+65, might accordingly form a new evolutionary sequence that follow the asymptotic giant branch.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:44:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Dufour", "P.", "" ], [ "Liebert", "James", "" ], [ "Fontaine", "G.", "" ], [ "Behara", "N.", "" ] ]
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711.3228
Filipe Moura
Filipe Moura
One loop superstring effective actions and d=4 supergravity
1+7 pages. Work presented at the XVI International Fall Workshop on Geometry and Physics, Lisbon, Portugal, September 2007
AIPConf.Proc.1023:192-196,2008
10.1063/1.2958174
null
hep-th
null
We review our recent work on the existence of a new independent R^4 term, at one loop, in the type IIA and heterotic effective actions, after reduction to four dimensions, besides the usual square of the Bel-Robinson tensor. We discuss its supersymmetrization.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:36:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Moura", "Filipe", "" ] ]
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711.3229
Alistair Windsor
Rafael de la Llave and Alistair Windsor
Liv\v{s}ic Theorems for Non-Commutative Groups including Diffeomorphism Groups and Results on the Existence of Conformal Structures for Anosov Systems
Replaced 11/22 to fix problems with references in previously uploaded versions. No other changes
null
null
null
math.DS
null
The celebrated Livsic theorem states that given M a manifold, a Lie group G, a transitive Anosov diffeomorphism f on M and a Holder function \eta: M \mapsto G whose range is sufficiently close to the identity, it is sufficient for the existence of \phi :M \mapsto G satisfying \eta(x) = \phi(f(x)) \phi(x)^{-1} that a condition -- obviously necessary -- on the cocycle generated by \eta restricted to periodic orbits is satisfied. In this paper we present a new proof of the main result. These methods allow us to treat cocycles taking values in the group of diffeomorphisms of a compact manifold. This has applications to rigidity theory. The localization procedure we develop can be applied to obtain some new results on the existence of conformal structures for Anosov systems.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:20:45 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 20:27:33 GMT" } ]
2007-11-22T00:00:00
[ [ "de la Llave", "Rafael", "" ], [ "Windsor", "Alistair", "" ] ]
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711.323
Andrea Tomadin
Andrea Tomadin, Riccardo Mannella, Sandro Wimberger
Many-body Landau-Zener tunneling in the Bose-Hubbard model
10 pages, 6 figures. High-quality figures can be requested to the authors
Phys. Rev. A 77, 013606 (2008)
10.1103/PhysRevA.77.013606
null
cond-mat.str-el
null
We study a model for ultracold, spinless atoms in quasi-one dimensional optical lattices and subjected to a tunable tilting force. Statistical tests are employed to quantitatively characterize the spectrum of the Floquet-Bloch operator of the system along the transition from the regular to the quantum chaotic regime. Moreover, we perturbatively include the coupling of the one-band model to the second energy band. This allows us to study the Landau-Zener interband tunneling within a truly many-body description of ultracold atoms. The distributions of the computed tunneling rates provide an independent and experimentally accessible signature of the regular-chaotic transition.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:07:51 GMT" } ]
2008-01-09T00:00:00
[ [ "Tomadin", "Andrea", "" ], [ "Mannella", "Riccardo", "" ], [ "Wimberger", "Sandro", "" ] ]
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711.3231
Ioannis Rousochatzakis
Ioannis Rousochatzakis, Andreas M. Laeuchli and Frederic Mila
Highly Frustrated Magnetic Clusters: The kagome on a sphere
22 pages Added references Corrected typos
Phys. Rev. B 77, 094420 (2008)
10.1103/PhysRevB.77.094420
null
cond-mat.other
null
We present a detailed study of the low-energy excitations of two existing finite-size realizations of the planar kagome Heisenberg antiferromagnet on the sphere, the cuboctahedron and the icosidodecahedron. After highlighting a number of special spectral features (such as the presence of low-lying singlets below the first triplet and the existence of localized magnons) we focus on two major issues. The first concerns the nature of the excitations above the plateau phase at 1/3 of the saturation magnetization Ms. Our exact diagonalizations for the s=1/2 icosidodecahedron reveal that the low-lying plateau states are adiabatically connected to the degenerate collinear ``up-up-down'' ground states of the Ising point, at the same time being well isolated from higher excitations. A complementary physical picture emerges from the derivation of an effective quantum dimer model which reveals the central role of the topology and the intrinsic spin s. We also give a prediction for the low energy excitations and thermodynamic properties of the spin s=5/2 icosidodecahedron Mo72Fe30. In the second part we focus on the low-energy spectra of the s>1/2 Heisenberg model in view of interpreting the broad inelastic neutron scattering response reported for Mo72Fe30. To this end we demonstrate the simultaneous presence of several broadened low-energy ``towers of states'' or ``rotational bands'' which arise from the large discrete spatial degeneracy of the classical ground states, a generic feature of highly frustrated clusters. This semiclassical interpretation is further corroborated by their striking symmetry pattern which is shown, by an independent group theoretical analysis, to be a characteristic fingerprint of the classical coplanar ground states.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:13:42 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 15:54:57 GMT" } ]
2008-04-01T00:00:00
[ [ "Rousochatzakis", "Ioannis", "" ], [ "Laeuchli", "Andreas M.", "" ], [ "Mila", "Frederic", "" ] ]
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711.3232
George Hau
George Hau, Richard Bower, Virginia Kilborn, Duncan Forbes, Michael Balogh, Tom Oosterloo
Is NGC 3108 transforming itself from an early to late type galaxy -- an astronomical hermaphrodite?
9 pages, 3 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12740.x
null
astro-ph
null
A common feature of hierarchical galaxy formation models is the process of "inverse" morphological transformation: a bulge dominated galaxy accretes a gas disk, dramatically reducing the system's bulge-to-disk mass ratio. During their formation, present day galaxies may execute many such cycles across the Hubble diagram. A good candidate for such a "hermaphrodite" galaxy is NGC 3108: a dust-lane early-type galaxy which has a large amount of HI gas distributed in a large scale disk. We present narrow band H_alpha and R-band imaging, and compare the results with the HI distribution. The emission is in two components: a nuclear bar and an extended disk component which coincides with the HI distribution. This suggests that a stellar disk is currently being formed out of the HI gas. The spatial distributions of the H_alpha and HI emission and the HII regions are consistent with a barred spiral structure, extending some 20 kpc in radius. We measure an extinction- corrected SFR of 0.42 Msun/yr. The luminosity function of the HII regions is similar to other spiral galaxies, with a power law index of -2.1, suggesting that the star formation mechanism is similar to other spiral galaxies. We measured the current disk mass and find that it is too massive to have been formed by the current SFR over the last few Gyr. It is likely that the SFR in NGC 3108 was higher in the past. With the current SFR, the disk in NGC 3108 will grow to be ~6.2x10^9 Msun in stellar mass within the next 5.5 Gyr. While this is substantial, the disk will be insignificant compared with the large bulge mass: the final stellar mass disk-to-bulge ratio will be ~0.02. NGC 3108 will fail to transform into anything resembling a spiral without a boost in the SFR and additional supply of gas.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:20:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Hau", "George", "" ], [ "Bower", "Richard", "" ], [ "Kilborn", "Virginia", "" ], [ "Forbes", "Duncan", "" ], [ "Balogh", "Michael", "" ], [ "Oosterloo", "Tom", "" ] ]
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711.3233
Alejandra Montecinos Mrs
Rodrigo Aros, Andres Gomberoff and Alejandra Montecinos
Counting the negative eigenvalues of the thermalon in three dimensions
null
Phys.Rev.D77:063501,2008
10.1103/PhysRevD.77.063501
null
hep-th
null
Some years ago it was shown that the cosmological constant may be reduced by thermal production of membranes that, after nucleation, collapse into a black hole. The probability of the process was calculated in the leading semiclassical approximation by studying an associated Euclidean configuration called the thermalon. Here we investigate the thermalon in three spacetime dimensions, describing the nucleation of closed strings that collapse into point particle singularities. In this context we may analyze the one-loop structure without the well known problems brought in by the propagating gravitational degrees of freedom. We found that the coupling to gravity may increase the number of negative eigenvalues of the operator.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:25:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Aros", "Rodrigo", "" ], [ "Gomberoff", "Andres", "" ], [ "Montecinos", "Alejandra", "" ] ]
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711.3234
Ishwaree P. Neupane
Ishwaree P. Neupane
Constraints on Gauss-Bonnet Cosmologies
15 pages, 5 eps figures; Invited Talk at DARK 2007, Sydney, Australia, 23-28 Sept 2007; WSPC-Proceedings, MPLA (Special Issue); references added
null
10.1142/9789812814357_0023
null
hep-th astro-ph gr-qc
null
The modified Gauss-Bonnet gravity can be motivated by a number of physical reasons, including: the uniqueness of a gravitational Lagrangian in four and higher dimensions and the leading order $\alpha^\prime$ corrections in superstring theory. Such an effective theory of scalar-tensor gravity has been modeled in the recent past to explain both the initial cosmological singularity problem and the observationally supported cosmological perturbations. Here I present an overview of the recent developments in the use of modified Gauss-Bonnet gravity to explain current observations, touching on key cosmological and astrophysical constraints applicable to theories of scalar-tensor gravity. The Gauss-Bonnet type modification of Einstein's theory admits nonsingular solutions for a wide range of scalar-curvature couplings. It also provides plausible explanation to some outstanding cosmological conundrums, including: the transition from matter dominance to dark energy and the late time cosmic acceleration. The focus is placed here to constrain such an effective theory of gravity against the recent cosmological and astrophysical observations.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:47:18 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 15:33:20 GMT" } ]
2017-08-23T00:00:00
[ [ "Neupane", "Ishwaree P.", "" ] ]
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711.3235
Joseph Y. Halpern
Peter D. Grunwald and Joseph Y. Halpern
A Game-Theoretic Analysis of Updating Sets of Probabilities
null
null
null
null
cs.AI math.ST stat.TH
null
We consider how an agent should update her uncertainty when it is represented by a set $\P$ of probability distributions and the agent observes that a random variable $X$ takes on value $x$, given that the agent makes decisions using the minimax criterion, perhaps the best-studied and most commonly-used criterion in the literature. We adopt a game-theoretic framework, where the agent plays against a bookie, who chooses some distribution from $\P$. We consider two reasonable games that differ in what the bookie knows when he makes his choice. Anomalies that have been observed before, like time inconsistency, can be understood as arising important because different games are being played, against bookies with different information. We characterize the important special cases in which the optimal decision rules according to the minimax criterion amount to either conditioning or simply ignoring the information. Finally, we consider the relationship between conditioning and calibration when uncertainty is described by sets of probabilities.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:34:12 GMT" } ]
2007-11-27T00:00:00
[ [ "Grunwald", "Peter D.", "" ], [ "Halpern", "Joseph Y.", "" ] ]
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711.3236
Paul Kabaila
Paul Kabaila, Khageswor Giri
Confidence intervals in regression utilizing prior information
This version differs from v2 in 2 respects. Firstly, a few typos have been corrected. Secondly, the paper has been shortened. This version has been accepted for publication in Journal of Statistical Planning and Inference
Confidence intervals in regression utilizing prior information. Journal of Statistical Planning and Inference, 139, 3419-3429 (2009)
null
null
stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a linear regression model with regression parameter beta=(beta_1,...,beta_p) and independent and identically N(0,sigma^2) distributed errors. Suppose that the parameter of interest is theta = a^T beta where a is a specified vector. Define the parameter tau=c^T beta-t where the vector c and the number t are specified and a and c are linearly independent. Also suppose that we have uncertain prior information that tau = 0. We present a new frequentist 1-alpha confidence interval for theta that utilizes this prior information. We require this confidence interval to (a) have endpoints that are continuous functions of the data and (b) coincide with the standard 1-alpha confidence interval when the data strongly contradicts this prior information. This interval is optimal in the sense that it has minimum weighted average expected length where the largest weight is given to this expected length when tau=0. This minimization leads to an interval that has the following desirable properties. This interval has expected length that (a) is relatively small when the prior information about tau is correct and (b) has a maximum value that is not too large. The following problem will be used to illustrate the application of this new confidence interval. Consider a 2-by 2 factorial experiment with 20 replicates. Suppose that the parameter of interest theta is a specified simple effect and that we have uncertain prior information that the two-factor interaction is zero. Our aim is to find a frequentist 0.95 confidence interval for theta that utilizes this prior information.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:36:20 GMT" }, { "version": "v2", "created": "Tue, 2 Sep 2008 05:56:15 GMT" }, { "version": "v3", "created": "Wed, 25 Mar 2009 22:45:06 GMT" } ]
2017-10-18T00:00:00
[ [ "Kabaila", "Paul", "" ], [ "Giri", "Khageswor", "" ] ]
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711.3237
Cristina Volpe
C. Volpe, J. Welzel
Supernova Relic Electron Neutrinos and anti-Neutrinos in future Large-scale Observatories
15 pages, 13 figures, 7 tables
null
null
null
astro-ph hep-ex hep-ph nucl-th
null
We investigate the signal from supernova relic neutrinos in future large scale observatories, such as MEMPHYS (UNO, Hyper-K), LENA and GLACIER, at present under study. We discuss that complementary information might be gained from the observation of supernova relic electron anti-neutrinos and neutrinos using the scattering on protons on one hand, and on nuclei such as oxygen, carbon or argon on the other hand. When determining the relic neutrino fluxes we also include, for the first time, the coupling of the neutrino magnetic moment to magnetic fields within the core-collapse supernova. We present numerical results on both the relic electron neutrino and anti-neutrino fluxes and on the number of events for electron neutrinos on carbon, oxygen and argon, as well as electron anti-neutrinos on protons, for various oscillation scenarios. The observation of supernova relic neutrinos might provide us with unique information on core-collapse supernova explosions, on the star formation history and on neutrino properties, that still remain unknown.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 23:53:02 GMT" } ]
2007-11-23T00:00:00
[ [ "Volpe", "C.", "" ], [ "Welzel", "J.", "" ] ]
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711.3238
Jose D'Incao
J. P. D'Incao, B. D. Esry
Suppression of molecular decay in ultracold gases without Fermi statistics
null
Phys. Rev. Lett. 100, 163201 (2008)
10.1103/PhysRevLett.100.163201
null
physics.atom-ph
null
We study inelastic processes for ultracold three-body systems in which only one interaction is resonant. We have found that the decay rates for weakly bound molecules due to collisions with other atoms can be suppressed not only without fermionic statistics but also when bosonic statistics applies. In addition, we show that at ultracold temperatures three-body recombination involving a single resonant pair of atoms leads mainly to formation of weakly bound molecules which, in turn, are stable against decay. These results indicate that recombination in three-component atomic gases can be used as an efficient mechanism for molecular formation, allowing the achievement of high molecular densities.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:02:39 GMT" } ]
2009-11-13T00:00:00
[ [ "D'Incao", "J. P.", "" ], [ "Esry", "B. D.", "" ] ]
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711.3239
Tomaso Aste
T. Aste and T. Di Matteo
A deductive statistical mechanics approach for granular matter
15 pages, 6 figures
Phys. Rev. E 77 (2008) 021309
10.1103/PhysRevE.77.021309
null
cond-mat.soft
null
We introduce a deductive statistical mechanics approach for granular materials which is formally built from few realistic physical assumptions. The main finding is an universal behavior for the distribution of the density fluctuations. Such a distribution is the equivalent of the Maxwell-Boltzmann's distribution in the kinetic theory of gasses. The comparison with a very extensive set of experimental and simulation data for packings of monosized spherical grains, reveals a remarkably good quantitative agreement with the theoretical predictions for the density fluctuations both at the grain level and at the global system level. Such agreement is robust over a broad range of packing fractions and it is observed in several distinct systems prepared by using different methods. The equilibrium distributions are characterized by only one parameter ($k$) which is a quantity very sensitive to changes in the structural organization. The thermodynamical equivalent of $k$ and its relation with the `granular temperature' are also discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:04:28 GMT" } ]
2008-06-25T00:00:00
[ [ "Aste", "T.", "" ], [ "Di Matteo", "T.", "" ] ]
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711.324
Hossein Yavartanoo
Hossein Yavartanoo and Sangheon Yun
Higher derivative correction to Kaluza-Klein black hole solution
25 pages, 2 figures, JHEP styl
Eur.Phys.J.C57:797-808,2008
10.1140/epjc/s10052-008-0706-3
null
hep-th
null
We investigate the attractor mechanism in Kaluza-Klein black hole solution in the presence of higher derivative terms. In particular, we discuss the attractor behavior of static black holes by using the effective potential approach as well as entropy function formalism. We consider different higher derivative terms with a general coupling to moduli field. For the $R^2$ theory, we use effective potential approach, looking for solutions which are analytic near the horizon and show that they exist and enjoy the attractor behavior. The attractor point is determined by extremization of the modified effective potential at the horizon. We study the effect of the general higher derivative corrections of $R^n$ terms. Using the entropy function we define the modified effective potential and we find the conditions to have the attractor solution. In particular for a single charged Kaluza-Klein black hole solution we show that higher derivative correction dresses the naked singularity for an appropriate coupling, and we can find the attractor solution.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:06:24 GMT" } ]
2008-12-18T00:00:00
[ [ "Yavartanoo", "Hossein", "" ], [ "Yun", "Sangheon", "" ] ]
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711.3241
Nobuhiko Hayashi
N. Hayashi, C. Iniotakis, M. Machida, M. Sigrist
Josephson Effect between Conventional and Rashba Superconductors
8 pages, no figure; reference updated
Physica C 468, 844 (2008)
10.1016/j.physc.2007.11.065
null
cond-mat.supr-con
null
We study the Josephson effect between a conventional s-wave superconductor and a non-centrosymmetric superconductor with Rashba spin-orbit coupling. Rashba spin-orbit coupling affects the Josephson pair tunneling in a characteristic way. The Josephson coupling can be decomposed into two parts, a `spin-singlet-like' and a `spin-triplet-like' component. The latter component can lead to shift of the Josephson phase by \pi relative to the former coupling. This has important implications on interference effects and may explain some recent experimental results for the Al/CePt3Si junction.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 00:29:33 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 16:46:04 GMT" } ]
2008-06-06T00:00:00
[ [ "Hayashi", "N.", "" ], [ "Iniotakis", "C.", "" ], [ "Machida", "M.", "" ], [ "Sigrist", "M.", "" ] ]
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711.3242
Frank Nielsen
Frank Nielsen, Richard Nock
On the Centroids of Symmetrized Bregman Divergences
17 pages
null
null
null
cs.CG
null
In this paper, we generalize the notions of centroids and barycenters to the broad class of information-theoretic distortion measures called Bregman divergences. Bregman divergences are versatile, and unify quadratic geometric distances with various statistical entropic measures. Because Bregman divergences are typically asymmetric, we consider both the left-sided and right-sided centroids and the symmetrized centroids, and prove that all three are unique. We give closed-form solutions for the sided centroids that are generalized means, and design a provably fast and efficient approximation algorithm for the symmetrized centroid based on its exact geometric characterization that requires solely to walk on the geodesic linking the two sided centroids. We report on our generic implementation for computing entropic centers of image clusters and entropic centers of multivariate normals, and compare our results with former ad-hoc methods.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 01:15:19 GMT" } ]
2007-11-22T00:00:00
[ [ "Nielsen", "Frank", "" ], [ "Nock", "Richard", "" ] ]
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711.3243
Xiao Zhang
Xiao Zhang
A quasi-local mass for 2-spheres with negative Gauss curvature
10 pages, Science in China, Series A: Math, to appear
Science in China Series A: Mathematics, 51, 1644-1650(2008).
10.1007/s11433-008-0156-9
null
gr-qc astro-ph math.DG
null
We extend our previous definition of quasi-local mass to 2-spheres whose Gauss curvature is negative and prove its positivity.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 01:33:22 GMT" } ]
2015-05-13T00:00:00
[ [ "Zhang", "Xiao", "" ] ]
[ 0.0401571132, 0.0480108894, 0.0338226669, 0.0448553525, 0.0223224927, -0.0542752109, -0.0727876872, -0.0299892761, -0.0342200287, -0.0271843541, -0.0253845304, -0.0184774138, -0.0625029802, 0.0543687083, 0.1491282731, 0.142957449, -0.0075206934, -0.0125052705, 0.0542284623, 0.0458604507, 0.0306671318, -0.0381936692, 0.0473564081, 0.0320228413, -0.0324669555, -0.0416764431, 0.0884952396, 0.0144219659, 0.1248189658, -0.0670375973, -0.0342434049, -0.0456968285, -0.0955075473, -0.0159529857, -0.1317377687, 0.1394980401, -0.0175541267, 0.091113165, -0.0329811908, 0.0147492066, -0.0769950673, 0.0546024516, 0.0053819413, 0.0265766215, 0.0433126464, 0.0406012237, 0.0040554474, -0.0095484173, -0.0073161675, -0.0523117669, -0.0966762602, -0.0264130011, 0.0596980602, -0.0431957766, -0.0375859365, -0.0251040384, -0.1338881999, 0.0568463877, 0.0407180972, -0.0645599216, -0.0145855863, -0.0809219554, -0.0214576423, 0.0813426971, -0.0625964776, -0.047566779, -0.0054345336, -0.0673648417, 0.00117383, 0.009735412, -0.1287458539, 0.0385676585, 0.0326072015, -0.0013345286, 0.0750316232, -0.0433593951, 0.0664766133, 0.1573560387, -0.0190617722, -0.0383572876, -0.0134869926, 0.1376280934, 0.0466551781, 0.039572753, -0.0179047436, -0.0199616849, -0.0096828192, 0.0205460433, -0.0856903195, 0.1196766123, 0.0965827629, 0.0115761403, 0.0113014923, -0.0242391881, 0.0731616765, -0.0532467403, 0.022486113, -0.0097003505, 0.1018186137, 0.0188981518, -0.0646066666, 0.0360666029, 0.0963957682, -0.0275583435, 0.1982143819, 0.0587163344, -0.0062409481, 0.0358562358, -0.0013308764, -0.0280959532, 0.0467486754, 0.0209083445, 0.0035938043, -0.022906851, -0.0272077285, -0.0448553525, -0.0495068468, -0.090832673, -0.0118157277, 0.0222289953, 0.0484783761, -0.057220377, 0.00427166, -0.0495535955, 0.0510028042, -0.0830256492, -0.0601187982, 0.0448086038, -0.1271563917, -0.0086718788, 0.0288906805, -0.0244261827, 0.0463045612, -0.1049040258, -0.0776028037, 0.0346641429, 0.0495535955, -0.0927026197, 0.0582488477, -0.0385442823, 0.0639054403, 0.0177761838, -0.0000161155, 0.0703100041, -0.0062526353, 0.001139499, -0.0643261746, 0.0523117669, 0.0591370724, 0.0363704711, -0.0984527096, 0.0159412976, -0.0021898833, 0.054836195, -0.0734889209, -0.0369782038, 0.087420024, 0.0114008328, 0.0052037118, -0.0340797827, 0.0645131692, 0.0107989442, 0.0178813692, -0.0420738086, 0.1186481342, 0.0245664287, -0.0648404136, -0.0638586879, -0.0494600981, -0.1682952344, 0.057080131, -0.068627052, -0.1055585071, -0.0589033291, 0.0199499968, 0.1037820578, 0.0022176402, -0.1058389992, 0.0097880038, 0.038170293, 0.039292261, 0.076293841, 0.0538077243, 0.0252442844, -0.0312982388, 0.0775560513, 0.0165724047, 0.0505820662, 0.0574541204, 0.0644664243, -0.087700516, 0.0781637877, 0.1236969978, 0.1343556941, -0.0559114143, -0.1268759072, 0.0752186179, 0.0414193273, -0.0402506106, 0.0000808515, -0.004905689, -0.0346875153, 0.1035015658, -0.0297789071, 0.0119150691, -0.0233042147, 0.1148147434, 0.0826984048, -0.0226614196, -0.0648404136, 0.0103782061, 0.0585760884, 0.0245196801, 0.0903651863, 0.0132532492, 0.1519331932, 0.0418634377, 0.0564256497, -0.0063870377, 0.1301483065, -0.0196811929, 0.1181806475, 0.0036142569, 0.1219205484, 0.0265532471, -0.0231522806, 0.0658688843, -0.0259922631, 0.0174956918, 0.0271609798, 0.067785576, 0.040414229, -0.0506755635, -0.0950400606, -0.0060481098, -0.0733486712, 0.0413492024, 0.0206512269, -0.056799639, -0.0500678308, -0.0146557093, -0.0075499113, 0.0737226605, 0.0200668685, 0.0152985044, -0.0064688479, -0.0250806641, 0.0228951629, 0.0380767956, -0.0395493805, -0.0501613282, 0.0840073675, 0.0433126464, -0.0178346206, -0.100790143, -0.0263896268 ]
711.3244
Sangtaek Kim
Sangtaek Kim, Robert R. Mcleod, Mark Saffman, and Kelvin H. Wagner
Doppler-free, Multi-wavelength Acousto-optic deflector for two-photon addressing arrays of Rb atoms in a Quantum Information Processor
28 pages, 16 figures, submitted to Applied Optics
Appl. Opt. 47, 1816 (2008)
10.1364/AO.47.001816
null
quant-ph
null
We demonstrate a dual wavelength acousto-optic deflector (AOD) designed to deflect two wavelengths to the same angles by driving with two RF frequencies. The AOD is designed as a beam scanner to address two-photon transitions in a two-dimensional array of trapped neutral Rb atoms in a quantum computer. Momentum space is used to design AODs that have the same diffraction angles for two wavelengths (780 nm and 480 nm) and have non-overlapping Bragg-matched frequency response at these wavelengths, so that there will be no crosstalk when proportional RF frequencies are applied to diffract the two wavelengths. The appropriate crystal orientation, crystal shape, transducer size, and transducer height are determined for an AOD made with a Tellurium dioxide crystal (TeO2). The designed and fabricated AOD has more than 100 resolvable spots, widely separated bandshapes for the two wavelengths within an overall octave bandwidth, spatially overlapping diffraction angles for both wavelengths (780 nm and 480 nm), and a 4 usec or less access time. Cascaded AODs in which the first device upshifts and the second downshifts allow Doppler-free scanning as required for addressing the narrow atomic resonance without detuning. We experimentally show the diffraction-limited Doppler-free scanning performance and spatial resolution of the designed AOD.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 01:34:55 GMT" } ]
2012-06-05T00:00:00
[ [ "Kim", "Sangtaek", "" ], [ "Mcleod", "Robert R.", "" ], [ "Saffman", "Mark", "" ], [ "Wagner", "Kelvin H.", "" ] ]
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711.3245
Henrik Ingerslev J{\o}rgensen
H. Ingerslev J{\o}rgensen, K. Grove-Rasmussen, K.-Y. Wang, A. M. Blackburn, K. Flensberg, P. E. Lindelof, and D. A. Williams
Singlet-Triplet Physics and Shell Filling in Carbon Nanotube Double Quantum Dots
Supplement available at: http://www.fys.ku.dk/~hij/public/singlet-triple_supp.pdf
Nature Physics 4, 536 - 539 (2008)
10.1038/nphys987
null
cond-mat.mes-hall
null
An artifcial two-atomic molecule, also called a double quantum dot (DQD), is an ideal system for exploring few electron physics. Spin-entanglement between just two electrons can be explored in such systems where singlet and triplet states are accessible. These two spin-states can be regarded as the two states in a quantum two-state system, a so-called singlet-triplet qubit. A very attractive material for realizing spin based qubits is the carbon nanotube (CNT), because it is expected to have a very long spin coherence time. Here we show the existence of a gate-tunable singlet-triplet qubit in a CNT DQD. We show that the CNT DQD has clear shell structures of both four and eight electrons, with the singlet-triplet qubit present in the four-electron shells. We furthermore observe inelastic cotunneling via the singlet and triplet states, which we use to probe the splitting between singlet and triplet, in good agreement with theory.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:44:23 GMT" } ]
2008-12-22T00:00:00
[ [ "Jørgensen", "H. Ingerslev", "" ], [ "Grove-Rasmussen", "K.", "" ], [ "Wang", "K. -Y.", "" ], [ "Blackburn", "A. M.", "" ], [ "Flensberg", "K.", "" ], [ "Lindelof", "P. E.", "" ], [ "Williams", "D. A.", "" ] ]
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711.3246
Kaifu Luo
Kaifu Luo, Tapio Ala-Nissila, See-Chen Ying, and Aniket Bhattacharya
Sequence dependence of DNA translocation through a nanopore
4 pages, 4 figures, minor changes
Phys. Rev. Lett. 100, 058101 (2008)
10.1103/PhysRevLett.100.058101
null
cond-mat.soft cond-mat.stat-mech
null
We investigate the dynamics of DNA translocation through a nanopore using 2D Langevin dynamics simulations, focusing on the dependence of the translocation dynamics on the details of DNA sequences. The DNA molecules studied in this work are built from two types of bases $A$ and $C$, which has been shown previously to have different interactions with the pore. We study DNA with repeating blocks $A_nC_n$ for various values of $n$, and find that the translocation time depends strongly on the {\em block length} $2n$ as well as on the {\em orientation} of which base entering the pore first. Thus, we demonstrate that the measurement of translocation dynamics of DNA through nanopore can yield detailed information about its structure. We have also found that the periodicity of the block sequences are contained in the periodicity of the residence time of the individual nucleotides inside the pore.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:49:25 GMT" }, { "version": "v2", "created": "Sat, 1 Dec 2007 00:49:01 GMT" } ]
2008-02-05T00:00:00
[ [ "Luo", "Kaifu", "" ], [ "Ala-Nissila", "Tapio", "" ], [ "Ying", "See-Chen", "" ], [ "Bhattacharya", "Aniket", "" ] ]
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711.3247
Behtash Babadi
Behtash Babadi, Vahid Tarokh
A Distributed Dynamic Frequency Allocation Algorithm
null
null
null
null
cs.NI
null
We consider a network model where the nodes are grouped into a number of clusters and propose a distributed dynamic frequency allocation algorithm that achieves performance close to that of a centralized optimal algorithm. Each cluster chooses its transmission frequency band based on its knowledge of the interference that it experiences. The convergence of the proposed distributed algorithm to a sub-optimal frequency allocation pattern is proved. For some specific cases of spatial distributions of the clusters in the network, asymptotic bounds on the performance of the algorithm are derived and comparisons to the performance of optimal centralized solutions are made. These analytic results and additional simulation studies verify performance close to that of an optimum centralized frequency allocation algorithm. It is demonstrated that the algorithm achieves about 90% of the Shannon capacities corresponding to the optimum/near-optimum centralized frequency band assignments. Furthermore, we consider the scenario where each cluster can be in active or inactive mode according to a two-state Markov model. We derive conditions to guarantee finite steady state variance for the output of the algorithm using stochastic analysis. Further simulation studies confirm the results of stochastic modeling and the performance of the algorithm in the time-varying setup.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 01:47:54 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 22:34:53 GMT" } ]
2008-03-14T00:00:00
[ [ "Babadi", "Behtash", "" ], [ "Tarokh", "Vahid", "" ] ]
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711.3248
Tibra Ali
Tibra Ali and Gerald B. Cleaver
A Note on a Standard Embedding on Half-Flat Manifolds
5 pages. v2: 6 pages; slightly reworded; version submitted for publication. v3: uses JHEP3.cls, hence 14 pages now. Essentially same content as before. Article in title changed in accordance with JHEP editor's suggestion. Version to appear in JHEP
JHEP 0807:121,2008
10.1088/1126-6708/2008/07/121
BU-HEPP-07-14
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is argued that the ten dimensional solution that corresponds to the compactification of $E_8 \times E_8$ heterotic string theory on a half-flat manifold is the product space-time $R^{1,2} \times Z_7$ where $Z_7$ is a generalized cylinder with $G_2$ riemannian holonomy. Standard embedding on $Z_7$ then implies an embedding on the half-flat manifold which involves the torsionful connection rather than the Levi-Civita connection. This leads to the breakdown of $E_8 \times E_8$ to $E_6 \times E_8$, as in the case of the standard embedding on Calabi-Yau manifolds, which agrees with the result derived recently by Gurrieri, Lukas and Micu (arXiv:0709.1932) using a different approach. Green-Schwarz anomaly cancellation is then implemented via the torsionful connection on half-flat manifolds.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:15:00 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 20:12:08 GMT" }, { "version": "v3", "created": "Wed, 16 Jul 2008 17:27:53 GMT" } ]
2009-01-06T00:00:00
[ [ "Ali", "Tibra", "" ], [ "Cleaver", "Gerald B.", "" ] ]
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711.3249
Renato Vicente
Andre C.R. Martins, Renato Vicente
The Effect of a Random Drift on Mixed and Pure Strategies in the Snowdrift Game
5 pages, 2 figures, with minor corrections to the text
null
null
null
q-bio.PE
null
The replicator dynamics of players choosing either mixed or pure strategies are usually regarded as equivalent, as long as strategies are played with identical frequencies. In this paper we show that a population of pure strategists can be invaded by mixed strategists in any two-player game with equilibrium coexistence upon the addition of an arbitrarily small amount of noise in the replication process.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 01:53:10 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 03:00:48 GMT" } ]
2007-12-18T00:00:00
[ [ "Martins", "Andre C. R.", "" ], [ "Vicente", "Renato", "" ] ]
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711.325
Venkata Seshu Kumar Kurapati Mr
Venkata Seshu Kumar Kurapati
Improved Fully Dynamic Reachability Algorithm for Directed Graph
null
null
null
null
cs.DS
null
We propose a fully dynamic algorithm for maintaining reachability information in directed graphs. The proposed deterministic dynamic algorithm has an update time of $O((ins*n^{2}) + (del * (m+n*log(n))))$ where $m$ is the current number of edges, $n$ is the number of vertices in the graph, $ins$ is the number of edge insertions and $del$ is the number of edge deletions. Each query can be answered in O(1) time after each update. The proposed algorithm combines existing fully dynamic reachability algorithm with well known witness counting technique to improve efficiency of maintaining reachability information when edges are deleted. The proposed algorithm improves by a factor of $O(\frac{n^2}{m+n*log(n)})$ for edge deletion over the best existing fully dynamic algorithm for maintaining reachability information.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 03:22:12 GMT" } ]
2007-11-22T00:00:00
[ [ "Kurapati", "Venkata Seshu Kumar", "" ] ]
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711.3251
Niranjay Ravindran
Niranjay Ravindran, Nihar Jindal
Limited Feedback-based Block Diagonalization for the MIMO Broadcast Channel
20 pages, 4 figures, submitted to IEEE JSAC November 2007
null
10.1109/JSAC.2008.081013
null
cs.IT math.IT
null
Block diagonalization is a linear precoding technique for the multiple antenna broadcast (downlink) channel that involves transmission of multiple data streams to each receiver such that no multi-user interference is experienced at any of the receivers. This low-complexity scheme operates only a few dB away from capacity but requires very accurate channel knowledge at the transmitter. We consider a limited feedback system where each receiver knows its channel perfectly, but the transmitter is only provided with a finite number of channel feedback bits from each receiver. Using a random quantization argument, we quantify the throughput loss due to imperfect channel knowledge as a function of the feedback level. The quality of channel knowledge must improve proportional to the SNR in order to prevent interference-limitations, and we show that scaling the number of feedback bits linearly with the system SNR is sufficient to maintain a bounded rate loss. Finally, we compare our quantization strategy to an analog feedback scheme and show the superiority of quantized feedback.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:03:56 GMT" } ]
2016-11-17T00:00:00
[ [ "Ravindran", "Niranjay", "" ], [ "Jindal", "Nihar", "" ] ]
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711.3252
Dmitri Liventsev
Dmitri Liventsev, et al (for the Belle Collaboration)
Study of B -> D** l nu with full reconstruction tagging
12 pages, 4 figures, submitted to PRD(RC)
Phys.Rev.D77:091503,2008
10.1103/PhysRevD.77.091503
Belle Preprint 2007-46, KEK Preprint 2007-55
hep-ex
null
We report a study of semileptonic B decays to P-wave D** mesons. Semileptonic decay to D*_2 meson is observed for the first time and its product branching ratio is measured to be Br(B+ -> anti-D*0_2 l+nu) x Br(anti-D*0_2 -> D- pi+) = 0.22 +- 0.03(stat.) +- 0.04(syst.)%. The result is obtained using the fully reconstructed B tags from a data sample that contains 657 millions BB-bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 15:38:12 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 13:06:33 GMT" } ]
2019-08-13T00:00:00
[ [ "Liventsev", "Dmitri", "" ] ]
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711.3253
Hiroki Sayama
Jonathan P. Newman and Hiroki Sayama
The Effect of Sensory Blind Zones on Milling Behavior in a Dynamic Self-Propelled Particle Model
12 pages, 4 figures
Phys. Rev. E 78, 011913 (2008)
10.1103/PhysRevE.78.011913
null
q-bio.PE
null
Emergent pattern formation in self-propelled particle (SPP) systems is extensively studied because it addresses a range of swarming phenomena which occur without leadership. Here we present a dynamic SPP model in which a sensory blind zone is introduced into each particle's zone of interaction. Using numerical simulations we discovered that the degradation of milling patterns with increasing blind zone ranges undergoes two distinct transitions, including a new, spatially nonhomogeneous transition that involves cessation of particles' motion caused by broken symmetries in their interaction fields. Our results also show the necessity of nearly complete panoramic sensory ability for milling behavior to emerge in dynamic SPP models, suggesting a possible relationship between collective behavior and sensory systems of biological organisms.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:27:12 GMT" }, { "version": "v2", "created": "Sat, 22 Mar 2008 23:08:36 GMT" } ]
2008-07-23T00:00:00
[ [ "Newman", "Jonathan P.", "" ], [ "Sayama", "Hiroki", "" ] ]
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711.3254
Tang Jian
Qing-Peng Qiao, Jian Tang, Xue-Qian Li
Restudy on Dark Matter Time-Evolution in the Littlest Higgs model with T-parity
13 pages, 11 figures included
Commun.Theor.Phys.50:1211-1218,2008
10.1088/0253-6102/50/5/40
null
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Following previous study, in the Littlest Higgs model (LHM), the heavy photon is supposed to be a possible dark matter candidate and its relic abundance of the heavy photon is estimated in terms of the Boltzman-Lee-Weinberg time-evolution equation. The effects of the T-parity violation is also considered. Our calculations show that when Higgs mass $M_H$ taken to be 300 GeV and don't consider T-parity violation, only two narrow ranges $133<M_{A_{H}}<135$ GeV and $167<M_{A_{H}}<169$ GeV are tolerable with the current astrophysical observation and if $135<M_{A_{H}}<167$ GeV, there must at least exist another species of heavy particle contributing to the cold dark matter. As long as the T-parity can be violated, the heavy photon can decay into regular standard model particles and would affect the dark matter abundance in the universe, we discuss the constraint on the T-parity violation parameter based on the present data. Direct detection prospects are also discussed in some detail.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 03:09:27 GMT" }, { "version": "v2", "created": "Tue, 29 Jul 2008 03:09:56 GMT" }, { "version": "v3", "created": "Wed, 12 Nov 2008 09:18:54 GMT" } ]
2009-01-01T00:00:00
[ [ "Qiao", "Qing-Peng", "" ], [ "Tang", "Jian", "" ], [ "Li", "Xue-Qian", "" ] ]
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711.3255
Fan Xu
Fan Xu
On the cluster multiplication theorem for acyclic cluster algebras
23 pages
null
null
null
math.RT math.RA
null
In \cite{CK2005} and \cite{Hubery2005}, the authors proved the cluster multiplication theorems for finite type and affine type. We generalize their results and prove the cluster multiplication theorem for arbitrary type by using the properties of 2--Calabi--Yau (Auslander--Reiten formula) and high order associativity.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:39:44 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 09:05:41 GMT" } ]
2008-05-12T00:00:00
[ [ "Xu", "Fan", "" ] ]
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711.3256
Masato Ito
Masato Ito and Taku Sato
In-situ observation of a soap film catenoid - a simple educational physics experiment
13 pages, 9 figures; title is modified, final version to appear in European Journal of Physics
Eur. J. Phys. 31 (2010) 357-365.
null
AUE-07-1
physics.class-ph math-ph math.MP physics.ed-ph physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The solution to the Euler-Lagrange equation is an extremal functional.To understand that the functional is stationary at local extrema (maxima or minima), we propose a physics experiment that involves using soap film to form a catenoid. A catenoid is a surface that is formed between two coaxial circular rings and is classified mathematically as a minimal surface.Using soap film, we create catenoids between two rings and characterize the catenoid in-situ while varying distance between rings. The shape of the soap film is very interesting and can be explained using dynamic mechanics. By observing catenoid, physics students can observe local extrema phenomena. We stress that in-situ observation of soap film catenoids is an appropriate physics experiment that combines theory and experimentation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:40:23 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 01:35:50 GMT" }, { "version": "v3", "created": "Sat, 22 Mar 2008 01:37:14 GMT" }, { "version": "v4", "created": "Thu, 2 Apr 2009 10:19:20 GMT" }, { "version": "v5", "created": "Tue, 22 Dec 2009 00:51:08 GMT" } ]
2010-01-20T00:00:00
[ [ "Ito", "Masato", "" ], [ "Sato", "Taku", "" ] ]
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711.3257
Gyongsok Song
Y. Osafune, G. S. Song, J. I. Hwang, Y. Ishida, M. Kobayashi, K. Ebata, Y. Ooki, A. Fujimori, J. Okabayashi, K. Kanai, K. Kubo, and M. Oshima
Depth profile photoemission study of thermally diffused Mn/GaAs (001) interfaces
5 pages, 4 figures
J. Appl. Phys. 103, 103717 (2008)
10.1063/1.2931040
null
cond-mat.mtrl-sci cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed a depth profile study of thermally diffused Mn/GaAs (001) interfaces using photoemission spectroscopy combined with Ar$^+$-ion sputtering. We found that Mn ion was thermally diffused into the deep region of the GaAs substrate and completely reacted with GaAs. In the deep region, the Mn 2$p$ core-level and Mn 3$d$ valence-band spectra of the Mn/GaAs (001) sample heated to 600 $^{\circ}$C were similar to those of Ga$_{1-x}$Mn$_x$As, zinc-blende-type MnAs dots, and/or interstitial Mn in tetrahedrally coordinated by As atoms, suggesting that the Mn 3$d$ states were essentially localized but were hybridized with the electronic states of the host GaAs. Ferromagnetism was observed in the dilute Mn phase.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 02:58:19 GMT" }, { "version": "v2", "created": "Sun, 8 Jun 2008 16:30:34 GMT" } ]
2008-06-08T00:00:00
[ [ "Osafune", "Y.", "" ], [ "Song", "G. S.", "" ], [ "Hwang", "J. I.", "" ], [ "Ishida", "Y.", "" ], [ "Kobayashi", "M.", "" ], [ "Ebata", "K.", "" ], [ "Ooki", "Y.", "" ], [ "Fujimori", "A.", "" ], [ "Okabayashi", "J.", "" ], [ "Kanai", "K.", "" ], [ "Kubo", "K.", "" ], [ "Oshima", "M.", "" ] ]
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711.3258
Shu Nakamura
Kenichi Ito and Shu Nakamura
Singularities of solutions to Schrodinger equation on scattering manifold
null
null
null
null
math.AP math-ph math.MP
null
In this paper we study microlocal singularities of solutions to Schrodinger equations on scattering manifolds, i.e., noncompact Riemannian manifolds with asymptotically conic ends. We characterize the wave front set of the solutions in terms of the initial condition and the classical scattering maps under the nontrapping condition. Our result is closely related to a recent work by Hassell and Wunsch, though our model is more general and the method, which relies heavily on scattering theoretical ideas, is simple and quite different. In particular, we use Egorov-type argument in the standard pseudodifferential symbol classes, and avoid using Legendre distributions. In the proof, we employ a microlocal smoothing property in terms of the radially homogenous wave front set, which is more precise than the preceding results.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 04:59:34 GMT" } ]
2007-11-22T00:00:00
[ [ "Ito", "Kenichi", "" ], [ "Nakamura", "Shu", "" ] ]
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711.3259
Minoru Kawamura
M. Kawamura, H. Takahashi, S. Masubuchi, Y. Hashimoto, S. Katsumoto, K. Hamaya, T. Machida
Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect
3 pages, 2 figures, EP2DS-17
Physica E 40, p. 1389 (2008).
10.1016/j.physe.2007.09.022
null
cond-mat.mes-hall
null
Nuclear spins are polarized electrically in a breakdown regime of an odd-integer quantum Hall effect (QHE). Electron excitation to the upper Landau subband with the opposite spin polarity flips nuclear spins through the hyperfine interaction. The polarized nuclear spins reduce the spin-splitting energy and accelerate the QHE breakdown. The Knight shift of the nuclear spins is also measured by tuning electron density during the irradiation of radio-frequency magnetic fields.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 05:03:46 GMT" } ]
2008-07-04T00:00:00
[ [ "Kawamura", "M.", "" ], [ "Takahashi", "H.", "" ], [ "Masubuchi", "S.", "" ], [ "Hashimoto", "Y.", "" ], [ "Katsumoto", "S.", "" ], [ "Hamaya", "K.", "" ], [ "Machida", "T.", "" ] ]
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711.326
Bao-Xing Xie
Bao-Xing Xie, Kang Xue, Mo-Lin Ge
Bogoliubov Hamiltonian as Derivative of Dirac Hamiltonian via Braid Relation
3 pages, 5 figures
null
10.1103/PhysRevA.77.064101
null
quant-ph
null
In this paper we discuss a new type of 4-dimensional representation of the braid group. The matrices of braid operations are constructed by q-deformation of Hamiltonians. One is the Dirac Hamiltonian for free electron with mass m, the other, which we find, is related to the Bogoliubov Hamiltonian for quasiparticles in $^3$He-B with the same free energy and mass being m/2. In the process, we choose the free q-deformation parameter as a special value in order to be consistent with the anyon description for fractional quantum Hall effect with $\nu = 1/2$.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 05:53:52 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 14:28:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Xie", "Bao-Xing", "" ], [ "Xue", "Kang", "" ], [ "Ge", "Mo-Lin", "" ] ]
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711.3261
Shu Tanaka
Shu Tanaka and Seiji Miyashita
Mechanism of Slow Relaxation due to Screening Effect in a Frustrated System
16 pages, 9 figures, to appear in J. Phys. Soc. Jpn. vol.78 no.8 (2009)
J. Phys. Soc. Jpn. 78 084002 (2009).
10.1143/JPSJ.78.084002
null
cond-mat.stat-mech cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a slow relaxation process in a frustrated spin system in which a type of screening effect due to a frustrated environment plays an important role. This screening effect is attributed to the highly degenerate configurations of the frustrated environment. This slow relaxation is due to an entropy effect and is different from those due to the energy barrier observed in systems such as random ferromagnets. In the present system, even if there is no energy gap, the slow relaxation still takes place. Thus, we call this phenomenon ``entropic slowing down''. Here, we study the mechanism of entropic slowing down quantitatively in an Ising spin model with the so-called decorated bonds. The spins included in decorated bonds (decoration spins) cause a peculiar density of states, which causes on entropy-induced screening effect. We analytically estimate the time scale of the system that increases exponentially with the number of decoration spins. We demonstrate the scaling of relaxation processes using the time scale at all temperatures including the critical point.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 05:26:40 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 07:30:46 GMT" }, { "version": "v3", "created": "Wed, 4 Mar 2009 02:59:53 GMT" }, { "version": "v4", "created": "Mon, 15 Jun 2009 06:05:19 GMT" } ]
2009-08-10T00:00:00
[ [ "Tanaka", "Shu", "" ], [ "Miyashita", "Seiji", "" ] ]
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711.3262
Shijun Zheng
Gestur Olafsson and Shijun Zheng
Harmonic analysis related to Schroedinger operators
17 pages. Submitted
null
null
null
math.AP math.CA
null
In this article we give an overview on some recent development of Littlewood-Paley theory for Schr\"odinger operators. We extend the Littlewood-Paley theory for special potentials considered in the authors' previous work. We elaborate our approach by considering potential in $C^\infty_0$ or Schwartz class in one dimension. In particular the low energy estimates are treated by establishing some new and refined asymptotics for the eigenfunctions and their Fourier transforms. We give maximal function characterization of the Besov spaces and Triebel-Lizorkin spaces associated with $H$. Then we prove a spectral multiplier theorem on these spaces and derive Strichartz estimates for the wave equation with a potential. We also consider similar problem for the unbounded potentials in the Hermite and Laguerre cases, whose potentials $V=a|x|^2+b|x|^{-2}$ are known to be critical in the study of perturbation of nonlinear dispersive equations. This improves upon the previous results when we apply the upper Gaussian bound for the heat kernel and its gradient.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 05:42:45 GMT" } ]
2007-11-22T00:00:00
[ [ "Olafsson", "Gestur", "" ], [ "Zheng", "Shijun", "" ] ]
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711.3263
Joseph Kong
Joseph S. Kong, Vwani P. Roychowdhury
Preferential survival in models of complex ad hoc networks
9 pages, 6 figures
Physica A: Statistical Mechanics and its Applications, Vol. 387:3335-3347, 2008
10.1016/j.physa.2008.02.016
null
physics.soc-ph cond-mat.stat-mech
null
There has been a rich interplay in recent years between (i) empirical investigations of real world dynamic networks, (ii) analytical modeling of the microscopic mechanisms that drive the emergence of such networks, and (iii) harnessing of these mechanisms to either manipulate existing networks, or engineer new networks for specific tasks. We continue in this vein, and study the deletion phenomenon in the web by following two different sets of web-sites (each comprising more than 150,000 pages) over a one-year period. Empirical data show that there is a significant deletion component in the underlying web networks, but the deletion process is not uniform. This motivates us to introduce a new mechanism of preferential survival (PS), where nodes are removed according to a degree-dependent deletion kernel. We use the mean-field rate equation approach to study a general dynamic model driven by Preferential Attachment (PA), Double PA (DPA), and a tunable PS, where c nodes (c<1) are deleted per node added to the network, and verify our predictions via large-scale simulations. One of our results shows that, unlike in the case of uniform deletion, the PS kernel when coupled with the standard PA mechanism, can lead to heavy-tailed power law networks even in the presence of extreme turnover in the network. Moreover, a weak DPA mechanism, coupled with PS, can help make the network even more heavy-tailed, especially in the limit when deletion and insertion rates are almost equal, and the overall network growth is minimal. The dynamics reported in this work can be used to design and engineer stable ad hoc networks and explain the stability of the power law exponents observed in real-world networks.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 06:49:13 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 22:17:14 GMT" } ]
2009-03-20T00:00:00
[ [ "Kong", "Joseph S.", "" ], [ "Roychowdhury", "Vwani P.", "" ] ]
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711.3264
Spyros Kamvissis
S.Kamvissis, A.S.Fokas
The Focusing NLS Equation on the Half-Line with Periodic Boundary Conditions
9 pages, 1 figure
null
null
null
math.AP math-ph math.MP
null
We consider the Dirichlet problem for the focusing NLS equation on the half-line, with given Schwartz initial data and boundary data $q(0,t)$ equal to an exponentially decaying perturbation $u(t)$ of the periodic boundary data $ a e^{2i\omega t + i \epsilon}$ at $x=0.$ It is known from PDE theory that this is a well-posed problem (for fixed initial data and fixed $u$). On the other hand, the associated inverse scattering transform formalism involves the Neumann boundary value for $x=0$. Thus the implementation of this formalism requires the understanding of the "Dirichlet-to-Neumann" map which characterises the associated Neumann boundary value. We consider this map in an indirect way: we postulate a certain Riemann-Hilbert problem and then prove that the solution of the initial-boundary value problem for the focusing NLS constructed through this Riemann-Hilbert problem satisfies all the required properties: the data $q(x,0)$ are Schwartz and $q(0,t)-a e^{2i\omega t + i \epsilon}$ is exponentially decaying. More specifically, we focus on the case $-3a^2 < \omega < a^2.$ By considering a large class of appropriate scattering data for the t-problem, we provide solutions of the above Dirichlet problem such that the data $q_x(0,t)$ is given by an exponentially decaying perturbation of the function $2iab e^{2i\omega t + i \epsilon},$ where $\omega = a^2-2b^2,~~b>0$.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 06:58:05 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 15:41:56 GMT" }, { "version": "v3", "created": "Tue, 27 Nov 2007 15:06:32 GMT" }, { "version": "v4", "created": "Sun, 24 Feb 2008 16:26:57 GMT" } ]
2008-02-24T00:00:00
[ [ "Kamvissis", "S.", "" ], [ "Fokas", "A. S.", "" ] ]
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711.3265
Muhammad Akashi
Muhammad Akashi, Yohai Meiron, and Noam Soker
X-Ray Emission from Jet-Wind Interaction in Planetary Nebulae
20 pages, 8 figures
New Astron.13:563-568,2008
10.1016/j.newast.2008.03.002
null
astro-ph
null
We conduct 2D numerical simulations of jets expanding into the slow wind of asymptotic giant branch stars. We show that the post-shock jets' material can explain the observed extended X-ray emission from some planetary nebulae (PNs). Such jets are thought to shape many PNs, and therefore it is expected that this process will contribute to the X-ray emission from some PNs. In other PNs (not simulated in this work) the source of the extended X-ray emission is the shocked spherical wind blown by the central star. In a small fraction of PNs both sources might contribute, and a two-temperatures gas will fit better the X-ray properties than a one-temperature gas. A spacial separation between these two components is expected.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:38:58 GMT" } ]
2009-06-23T00:00:00
[ [ "Akashi", "Muhammad", "" ], [ "Meiron", "Yohai", "" ], [ "Soker", "Noam", "" ] ]
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711.3266
Hiroko Watanabe
Reizaburo Kitai, Hiroko Watanabe, Tahei Nakamura, Ken-ichi Otsuji, Takuma Matsumoto, Satoru UeNo, Shin-ichi Nagata, Kazunari Shibata, Richard Muller, Kiyoshi Ichimoto, Saku Tsuneta, Yoshinori Suematsu, Yukio Katsukawa, Toshifumi Shimizu, Theodore D. Tarbell, Richard A. Shine, Alan M. Title, Bruce W. Lites
Umbral Fine Structures in Sunspots Observed with Hinode Solar Optical Telescope
6 pages, 8 figures, accepted for publication in PASJ (Hinode Special Issue)
null
10.1093/pasj/59.sp3.S585
null
astro-ph
null
High resolution imaging observation of a sunspot umbra was done with Hinode Solar Optical Telescope (SOT). Filtergrams in wavelengths of blue and green continuum were taken during three consecutive days. The umbra consisted of a dark core region, several diffuse components and numerous umbral dots. We derived basic properties of umbral dots (UDs), especially their temperatures, lifetimes, proper motions, spatial distribution and morphological evolution. Brightness of UDs is confirmed to depend on the brightness of their surrounding background. Several UDs show fission and fusion. Thanks to the stable condition of space observation, we could first follow the temporal behavior of these events. The derived properties of internal structure of the umbra are discussed in viewpoint of magnetoconvection in a strong magnetic field.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:37:02 GMT" } ]
2015-05-13T00:00:00
[ [ "Kitai", "Reizaburo", "" ], [ "Watanabe", "Hiroko", "" ], [ "Nakamura", "Tahei", "" ], [ "Otsuji", "Ken-ichi", "" ], [ "Matsumoto", "Takuma", "" ], [ "UeNo", "Satoru", "" ], [ "Nagata", "Shin-ichi", "" ], [ "Shibata", "Kazunari", "" ], [ "Muller", "Richard", "" ], [ "Ichimoto", "Kiyoshi", "" ], [ "Tsuneta", "Saku", "" ], [ "Suematsu", "Yoshinori", "" ], [ "Katsukawa", "Yukio", "" ], [ "Shimizu", "Toshifumi", "" ], [ "Tarbell", "Theodore D.", "" ], [ "Shine", "Richard A.", "" ], [ "Title", "Alan M.", "" ], [ "Lites", "Bruce W.", "" ] ]
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711.3267
Boris Mogwitz
B. Mogwitz (1), C. Korte (1), M. von Kreutzbruck (2), L. Kienle (3), J. Janek (1) ((1) Physikalisch-Chemisches Institut der Justus-Liebig-Universit\"at, (2) Institut f\"ur Angewandte Physik der Justus-Liebig-Universit\"at, (3) Max-Planck-Institut f\"ur Festk\"orperforschung)
Preparation and magnetoresistance of Ag 2+x Se thin films deposited via Pulsed Laser Deposition
null
Journal of Applied Physics, 2007, 101, 043510
10.1063/1.2433128
null
cond-mat.other cond-mat.mtrl-sci
null
The preparation of Ag 2+x Se thin films with thicknesses between 4 nm and 3000 nm by pulsed laser deposition on single crystalline NaCl and MgO substrates is reported. The films are perfectly dense and show a good lateral uniformity with a small number of defects. The microstructure of the films corresponds to a nanoparquet, being composed of two different phases of silver selenide. One phase is identified as the Naumannite low temperature phase of silver selenide, the structure of the other phase has not been reported in detail before and probably represents a metastable phase. Silver-rich films contain silver precipitates with typical sizes on the nanoscale. Their presence and their size appears to be responsible for the large and linear magnetoresistance effect of silver-rich silver selenide.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 12:45:34 GMT" } ]
2007-11-22T00:00:00
[ [ "Mogwitz", "B.", "" ], [ "Korte", "C.", "" ], [ "von Kreutzbruck", "M.", "" ], [ "Kienle", "L.", "" ], [ "Janek", "J.", "" ] ]
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711.3268
Mikhail Braun
M. A. Braun
Nucleus-nucleus cross-sections and long-range correlations with a local supercritical pomeron
14 pages, 10 figures
Nucl.Phys.A806:230-244,2008
10.1016/j.nuclphysa.2008.02.301
null
hep-ph
null
Nucleus-nucleus scattering is studied in the local Reggeon Field Theory in the quasi-classical approximation with non-eikonal boundary conditions corresponding to the Glauber picture at low energies. Comparison with the commonly used eikonal boundary conditions shows that the new conditions make both the action and nucleus-nucleus total cross-sections lower by $3\div 5$ %. They also substantially change the behaviour of the solutions of the equations of motion at low energies. Using expressions for the double inclusive cross-sections derived earlier in the Reggeon Field Theory \cite{CM} long-range rapidity correlations are calculated for the RHIC and LHC energies.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:21:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Braun", "M. A.", "" ] ]
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711.3269
Jiawei Zhang
Jiawei Zhang
An Improved Procedure for Selecting the Profiles of Perfectly Matched Layers
submitted to Applied Computational Electromagnetics Society 2008 conference (under review)
null
null
null
math.NA
null
The perfectly matched layers (PMLs), as a boundary termination over an unbounded spatial domain, are widely used in numerical simulations of wave propagation problems. Given a set of discretization parameters, a procedure to select the PML profiles based on minimizing the discrete reflectivity is established for frequency domain simulations. We, by extending the function class and adopting a direct search method, improve the former procedure for traveling waves.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:32:02 GMT" } ]
2007-11-22T00:00:00
[ [ "Zhang", "Jiawei", "" ] ]
[ 0.044790227, 0.0670713708, 0.0554179363, -0.0349318199, 0.0255862754, -0.0235775523, 0.0275522582, 0.007635993, -0.114596881, 0.1185288504, 0.0193606615, -0.0677551925, -0.0708893687, 0.0665015206, 0.0875859782, 0.0599482432, 0.001425516, -0.031769149, 0.0191469677, 0.0555319041, 0.016839074, -0.0210132264, -0.0449896753, -0.0273813028, -0.0454740487, -0.0197310634, 0.0345329233, 0.038721323, 0.033051312, -0.0018716018, 0.0780694783, -0.0272530876, -0.121606037, -0.0560447685, 0.0356441326, -0.0069557345, -0.0958488062, 0.1179590002, -0.0955638811, 0.0707184151, -0.0130139543, 0.0254153199, -0.099381879, 0.0493775234, 0.045673497, 0.1071888283, 0.0047261952, 0.1189847291, 0.0732257515, 0.0042133303, -0.0217682794, 0.0553894415, -0.057440903, -0.0392341875, 0.0040138825, -0.0559592918, 0.0364419222, -0.0770437494, 0.058751557, 0.0211699363, -0.0569850244, 0.0080135185, 0.0674132854, 0.0158275906, -0.0439069606, -0.0648489594, -0.0839389414, -0.0195316169, 0.1055362597, 0.050488729, 0.0154286949, -0.0022936473, -0.0886686966, 0.0148730911, -0.0221671741, 0.0628544763, -0.047610987, 0.0258569531, 0.0006700192, -0.0543922037, 0.0839389414, 0.0770437494, 0.0597772896, 0.0108841397, -0.1165913567, -0.0682680607, -0.0134769576, 0.0464427918, -0.0957918242, -0.102174148, -0.0274525341, 0.0188050568, -0.0460154042, 0.0595493503, 0.0204148851, -0.0259709246, 0.0724849477, 0.0445907786, 0.0741944984, 0.0113685122, -0.0381514728, -0.0341055356, 0.0460723899, -0.0160840228, 0.1180729643, -0.0421404243, 0.0645070449, 0.0592074394, -0.1016042978, 0.1111777797, 0.012942723, 0.0341055356, -0.0023720015, 0.0439639464, 0.043508064, 0.0305724647, -0.0741375163, -0.0531100407, -0.062227644, 0.0556743667, -0.1284442395, 0.0101647032, 0.1196685508, -0.0070875124, 0.0614868402, -0.0764169171, 0.0332222693, -0.0863323063, -0.0492920429, -0.0373821743, -0.0583526641, 0.0821154192, 0.0979572535, -0.1232016161, -0.0699206218, 0.0542782359, 0.0433086157, 0.0129997078, 0.0277517065, -0.0630824193, 0.0389207713, -0.023164412, 0.0480383746, -0.0041883993, -0.0319970883, 0.0273813028, 0.0239052176, 0.0742514879, -0.0633673444, 0.0712882653, -0.0437929891, -0.1037127376, -0.0067776563, 0.0896944255, 0.0047938651, -0.0606890507, 0.0777845532, 0.0374676511, 0.0792661682, 0.0209135041, -0.0287916828, -0.0013907907, -0.0331652835, 0.0457589738, 0.1833778024, -0.0426532887, 0.0227797627, 0.0624555834, -0.1160784885, -0.0724279657, -0.0002855929, -0.1581904292, -0.014118039, -0.0249309465, 0.0105778445, -0.0426817834, -0.0596633181, -0.0874150246, -0.1192126647, -0.0299741216, 0.0624555834, 0.0508021489, 0.0093669128, -0.0512010418, -0.0251161493, 0.0261846185, 0.0683820248, 0.0370117724, -0.0357011184, -0.0052782376, 0.0133558642, 0.0432231389, 0.0050289282, -0.001687291, -0.069122836, -0.0608030185, 0.1140840128, 0.0894664824, -0.0638802126, 0.0288201757, -0.0585806035, -0.0435935408, 0.0567285903, 0.0178648047, -0.0403738879, 0.0289911311, 0.0228082556, 0.0670713708, -0.0883837715, -0.1074167714, 0.1249111667, -0.0383509211, 0.0874720067, 0.0132632637, -0.0152292475, -0.0870731175, -0.0668434352, 0.088497743, -0.0229364708, 0.1095252112, -0.0341340303, -0.015243494, 0.0667864457, 0.0230931807, -0.0577258281, 0.0285637435, 0.0636522695, -0.1521500051, -0.0030985605, -0.0261133872, 0.0315127186, -0.0045872945, -0.0398325324, -0.0510015935, 0.0223951135, -0.0515429527, -0.0793231502, 0.0162264854, 0.0160697773, -0.1095822006, -0.1084425002, 0.1540874988, -0.0217112936, -0.0221101884, 0.0590364821, -0.0261276327, -0.0536513999, -0.0883837715, 0.0148873376, -0.107644707, 0.0496054627, 0.0262416024, -0.0794941038, -0.0727698728, 0.0079779029, 0.1156795993 ]
711.327
J. Y. Vaishnav
J. Y. Vaishnav, Charles W. Clark
Observing Zitterbewegung in Ultracold Atoms
4 pages, 5 figures. Added references
Phys. Rev. Lett. 100, 153002 (2008)
10.1103/PhysRevLett.100.153002
null
cond-mat.mes-hall
null
We propose an optical lattice scheme which would permit the experimental observation of Zitterbewegung (ZB) with ultracold, neutral atoms. A four-level "tripod" variant of the usual setup for stimulated Raman adiabatic passage (STIRAP) has been proposed for generating non-Abelian gauge fields [1]. Dirac-like Hamiltonians, which exhibit ZB, are simple examples of such non-Abelian gauge fields; we show how a variety of them can arise, and how ZB can be observed, in a tripod system. We predict that the ZB should occur at experimentally accessible frequencies and amplitudes.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:46:30 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 20:15:55 GMT" } ]
2008-04-17T00:00:00
[ [ "Vaishnav", "J. Y.", "" ], [ "Clark", "Charles W.", "" ] ]
[ -0.0455403924, 0.1266352087, -0.0892152786, 0.0420837142, -0.1078155115, 0.0177497808, -0.0474882051, -0.0023044536, -0.0424952209, -0.0134837972, 0.0436748825, 0.0093069747, -0.0309455208, 0.0152121373, 0.0736327842, 0.0111724855, 0.0562396422, 0.0227290466, -0.0215905365, 0.0860329345, -0.0880630538, -0.0566785857, 0.0041356711, -0.0275711417, 0.0090257768, -0.1310246438, 0.0284490287, -0.0082713421, 0.0536059812, -0.0322897844, 0.1369503886, -0.0491616763, -0.0051472988, -0.0583794937, -0.0499298275, 0.0985428244, -0.053715717, -0.0026148004, -0.1062792093, 0.0207675174, -0.0584343597, 0.0064675589, -0.0139913261, 0.03522522, 0.0649087802, 0.0883922577, -0.0624397211, 0.0500121303, -0.0921232775, -0.0798328593, -0.0214122143, 0.0834541395, -0.0163232125, 0.0018723686, -0.0079901442, -0.009457862, 0.0438120551, 0.0000124444, -0.0362951458, 0.0074826158, 0.0195329878, -0.0522068478, 0.0298481621, 0.1268546879, -0.046747487, 0.0342924632, -0.0430439003, 0.0427421294, 0.0690787435, 0.1060048714, 0.0418916754, 0.0387642011, 0.0760469735, 0.0396420881, -0.0337712206, -0.0032063455, -0.0287782364, -0.0461713746, 0.0073728799, 0.1060048714, 0.011920061, -0.0216454044, 0.0309455208, -0.1144545302, -0.0310552567, -0.0166798551, -0.0106718149, 0.0004406582, -0.0496280566, 0.0256781969, 0.1350848824, 0.0384075604, -0.0123384288, 0.0172010995, 0.0240733102, -0.0070711062, 0.1401327252, -0.0228662156, 0.0364597477, 0.0086142672, -0.0051164357, -0.0432908088, 0.0507528484, -0.0176949129, 0.2021335065, 0.0660061389, -0.0526183583, -0.0125373248, 0.0024124749, 0.0374748074, -0.0091217961, -0.0088405972, -0.0414252989, -0.0058537237, -0.0384349935, -0.1293786168, -0.044799678, -0.0680362508, -0.0470218286, 0.0356915966, 0.0549228117, 0.0401084684, 0.0618910417, 0.0345668048, 0.0132300332, -0.0848258436, 0.0199719314, -0.1112721935, -0.0504236408, 0.0236069337, 0.133877784, -0.0489422046, -0.0081616063, -0.0622751154, -0.0621105134, 0.0111107584, 0.0715477988, 0.0163506474, 0.045814734, -0.0200953837, 0.1057305261, -0.000788298, 0.1978538036, 0.0158979874, 0.0498475283, 0.076869987, 0.0202051196, 0.0125236083, 0.0428244285, 0.0129351178, -0.0320977457, -0.0515209995, 0.0891604125, -0.0188471396, 0.0252941214, -0.0331676714, 0.1007924154, 0.0367615223, -0.0065738657, -0.0418368056, 0.0836187452, 0.0163506474, 0.081259422, 0.0410412215, 0.0706150457, -0.0082027577, -0.1147837415, 0.0192174967, -0.0406571478, -0.0549502447, -0.0341278613, -0.0973357335, -0.0719318762, 0.0077363802, 0.0624397211, 0.131244123, -0.0375571065, -0.0640857592, -0.0355818607, 0.0175028741, 0.0476528108, -0.0132094575, 0.0294915196, -0.0510271862, -0.0388465039, 0.0662256107, 0.0055176578, -0.0019340951, -0.067816779, 0.0129214004, -0.133877784, 0.0931109041, -0.0053564832, 0.1146740019, 0.0457049981, -0.1254281253, -0.018120138, 0.029025143, 0.0922330171, -0.0221803673, 0.0164055154, -0.0835090131, 0.0495457537, -0.080381535, -0.0835638791, 0.079997465, 0.1984024793, 0.0258702356, -0.1413398236, 0.0172834024, -0.0017360561, -0.0672132298, 0.0691884756, 0.0024450528, -0.1382672191, -0.0306163132, -0.0407943167, 0.056459114, -0.0186825357, 0.0639760196, -0.1171979308, 0.0231542718, 0.0929462984, 0.0701761022, -0.0301499348, 0.0057645636, -0.0167758744, -0.0005765421, 0.1013959572, 0.0888312012, 0.024210481, 0.012118957, 0.0311924256, 0.0002681242, -0.0115702776, 0.0958542973, -0.0329481997, -0.0398066938, -0.0111519098, -0.036103107, 0.0024313359, -0.0201502517, 0.0448545441, 0.0182710253, 0.034511935, 0.0293817837, -0.0396146551, -0.0617813058, 0.123452872, -0.0311101247, 0.0081478897, 0.1037552804, -0.1456195265, -0.0133603448, -0.0787903666, 0.0729194954 ]
711.3271
J. Sacks
M. J. Bayarri, J. O. Berger, J. Cafeo, G. Garcia-Donato, F. Liu, J. Palomo, R. J. Parthasarathy, R. Paulo, J. Sacks, D. Walsh
Computer model validation with functional output
Published in at http://dx.doi.org/10.1214/009053607000000163 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, 1874-1906
10.1214/009053607000000163
IMS-AOS-AOS0246
stat.ME
null
A key question in evaluation of computer models is Does the computer model adequately represent reality? A six-step process for computer model validation is set out in Bayarri et al. [Technometrics 49 (2007) 138--154] (and briefly summarized below), based on comparison of computer model runs with field data of the process being modeled. The methodology is particularly suited to treating the major issues associated with the validation process: quantifying multiple sources of error and uncertainty in computer models; combining multiple sources of information; and being able to adapt to different, but related scenarios. Two complications that frequently arise in practice are the need to deal with highly irregular functional data and the need to acknowledge and incorporate uncertainty in the inputs. We develop methodology to deal with both complications. A key part of the approach utilizes a wavelet representation of the functional data, applies a hierarchical version of the scalar validation methodology to the wavelet coefficients, and transforms back, to ultimately compare computer model output with field output. The generality of the methodology is only limited by the capability of a combination of computational tools and the appropriateness of decompositions of the sort (wavelets) employed here. The methods and analyses we present are illustrated with a test bed dynamic stress analysis for a particular engineering system.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 07:48:28 GMT" } ]
2009-09-29T00:00:00
[ [ "Bayarri", "M. J.", "" ], [ "Berger", "J. O.", "" ], [ "Cafeo", "J.", "" ], [ "Garcia-Donato", "G.", "" ], [ "Liu", "F.", "" ], [ "Palomo", "J.", "" ], [ "Parthasarathy", "R. J.", "" ], [ "Paulo", "R.", "" ], [ "Sacks", "J.", "" ], [ "Walsh", "D.", "" ] ]
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711.3272
Ahmet T. Alan
A. T. Alan
Unparticles in Gluodynamics
5 pages, 5 figures, introduction has been changed, tensor propagator in CFT has been included, references added
Int.J.Mod.Phys.A24:4403-4412,2009
10.1142/S0217751X09045911
null
hep-ph
null
The virtual effects of unparticle physics on the two-gluon jets production are explored for CERN LHC. It is found that depending on the scale dimension, unparticles can give rise to substantial enhancements in the transverse momentum and pseudo-rapidity distributions of hadronic cross sections, up to a factor of four-orders of magnitude.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 14:55:38 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 10:28:33 GMT" } ]
2009-09-25T00:00:00
[ [ "Alan", "A. T.", "" ] ]
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711.3273
Massimo Giovannini
Massimo Giovannini
Magnetogenesis, spectator fields and CMB signatures
15 pages, 6 figures
Phys.Lett.B659:661-668,2008
10.1016/j.physletb.2007.11.091
CERN-TH-PH/2007-229
astro-ph gr-qc hep-ph hep-th
null
A viable class of magnetogenesis models can be constructed by coupling the kinetic term of the hypercharge to a spectator field whose dynamics does not affect the inflationary evolution. The magnetic power spectrum is explicitly related to the power spectrum of (adiabatic) curvature inhomogeneities when the quasi-de Sitter stage of expansion is driven by a single scalar degree of freedom. Depending upon the value of the slow-roll parameters, the amplitude of smoothed magnetic fields over a (comoving) Mpc scale can be as large as 0.01--0.1 nG at the epoch of the gravitational collapse of the protogalaxy. The contributions of the magnetic fields to the Sachs-Wolfe plateau and to the temperature autocorrelations in the Doppler region compare favourably with the constraints imposed by galactic magnetogenesis. Stimulating lessons are drawn on the interplay between magnetogenesis models and their possible CMB signatures.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:17:13 GMT" } ]
2010-04-29T00:00:00
[ [ "Giovannini", "Massimo", "" ] ]
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711.3274
EDA Publishing Association
M.-A. Polosky, E.-J. Garcia
Microsystem Product Development
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
Over the last decade the successful design and fabrication of complex MEMS (MicroElectroMechanical Systems), optical circuits and ASICs have been demonstrated. Packaging and integration processes have lagged behind MEMS research but are rapidly maturing. As packaging processes evolve, a new challenge presents itself, microsystem product development. Product development entails the maturation of the design and all the processes needed to successfully produce a product. Elements such as tooling design, fixtures, gages, testers, inspection, work instructions, process planning, etc., are often overlooked as MEMS engineers concentrate on design, fabrication and packaging processes. Thorough, up-front planning of product development efforts is crucial to the success of any project.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:18:26 GMT" } ]
2007-11-29T00:00:00
[ [ "Polosky", "M. -A.", "" ], [ "Garcia", "E. -J.", "" ] ]
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711.3275
EDA Publishing Association
J. Iannacci, Jason Tian, S. Sinaga, R. Gaddi, A. Gnudi, M. Bartek
Parasitic Effects Reduction for Wafer-Level Packaging of RF-Mems
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 RF-MEMS packaging, next to the protection of movable structures, optimization of package electrical performance plays a very important role. In this work, a wafer-level packaging process has been investigated and optimized in order to minimize electrical parasitic effects. The RF-MEMS package concept used is based on a wafer-level bonding of a capping silicon substrate to an RF-MEMS wafer. The capping silicon substrate resistivity, substrate thickness and the geometry of through-substrate electrical interconnect vias have been optimized using finite-element electromagnetic simulations (Ansoft HFSS). Test structures for electrical characterization have been designed and after their fabrication, measurement results will be compared with simulations.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:24:39 GMT" } ]
2007-11-29T00:00:00
[ [ "Iannacci", "J.", "" ], [ "Tian", "Jason", "" ], [ "Sinaga", "S.", "" ], [ "Gaddi", "R.", "" ], [ "Gnudi", "A.", "" ], [ "Bartek", "M.", "" ] ]
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711.3276
EDA Publishing Association
A. Phommahaxay (ESYCOM-Esiee), G. Lissorgues (ESYCOM-Esiee), L. Rousseau (ESYCOM-Esiee), T. Bourouina (ESYCOM-Esiee), P. Nicole
Surface Conditioning Effect on Vacuum Microelectronics Components Fabricated by Deep Reactive Ion Etching
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
Advances in material processing such as silicon micromachining are opening the way to vacuum microelectronics. Two-dimensional vacuum components can be fabricated using the microsystems processes. We developed such devices using a single metal layer and silicon micromachining by DRIE. The latter technological step has significant impact on the characteristics of the vacuum components. This paper presents a brief summary of electron emission possibilities and the design leading to the fabrication of a lateral field emission diode. First measurement results and the aging of the devices are also discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:25:17 GMT" } ]
2007-11-29T00:00:00
[ [ "Phommahaxay", "A.", "", "ESYCOM-Esiee" ], [ "Lissorgues", "G.", "", "ESYCOM-Esiee" ], [ "Rousseau", "L.", "", "ESYCOM-Esiee" ], [ "Bourouina", "T.", "", "ESYCOM-Esiee" ], [ "Nicole", "P.", "" ] ]
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711.3277
EDA Publishing Association
C. Mendez, C. Louis, S. Paquay, P. De Vincenzo, I. Klapka, V. Rochus, F. Iker, Nicolas Andr\'e, J.-P. Raskin
3-D Self-Assembled Soi Mems: An Example of Multiphysics Simulation
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
MEMS devices are typical systems where multiphysics simulations are unavoidable. In this work, we present possible applications of 3-D self-assembled SOI (Silicon-on-Insulator) MEMS such as, for instance, thermal actuators and flow sensors. The numerical simulations of these microsystems are presented. Structural and thermal parts have to be strongly coupled for correctly describing the fabrication process and for simulating the behavior of these 3-D SOI MEMS.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:25:55 GMT" } ]
2007-11-29T00:00:00
[ [ "Mendez", "C.", "" ], [ "Louis", "C.", "" ], [ "Paquay", "S.", "" ], [ "De Vincenzo", "P.", "" ], [ "Klapka", "I.", "" ], [ "Rochus", "V.", "" ], [ "Iker", "F.", "" ], [ "André", "Nicolas", "" ], [ "Raskin", "J. -P.", "" ] ]
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711.3278
Daniel Neumaier
Daniel Neumaier, Markus Schlapps, Ursula Wurstbauer, Janusz Sadowski, Matthias Reinwald, Werner Wegscheider, Dieter Weiss
Electron-electron interaction in 2D and 1D ferromagnetic (Ga,Mn)As
4 pages, 2 figures, v2: spelling of author name corrected
null
10.1103/PhysRevB.77.041306
null
cond-mat.mes-hall
null
We investigated the magnetotransport in high quality ferromagnetic (Ga,Mn)As films and wires. At low temperature the conductivity decreases with decreasing temperature without saturation down to 20 mK. Here we show, that the conductivity decrease follows a ln($T/T_0$) dependency in 2D films and a $-1/\sqrt{T}$ dependency in 1D wires and is independent of an applied magnetic field. This behavior can be explained by the theory of electron-electron interaction.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:26:56 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 16:08:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Neumaier", "Daniel", "" ], [ "Schlapps", "Markus", "" ], [ "Wurstbauer", "Ursula", "" ], [ "Sadowski", "Janusz", "" ], [ "Reinwald", "Matthias", "" ], [ "Wegscheider", "Werner", "" ], [ "Weiss", "Dieter", "" ] ]
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711.3279
EDA Publishing Association
M. Dominguez, Joan Pons, J. Ricart, J. Juillard (EA2523), E. Colinet (EA2523)
Influence of the Feedback Filter on the Response of the Pulsed Digital Oscillator
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 introduces a new feedback topology for the Pulsed Digital Oscillator (PDO) and compares it to the classical topology. The `classic' or single feedback topology, introduced in previous works, shows a strong behavior dependence on the damping losses in the MEMS resonator. A new double feedback topology is introduced here in order to help solving this problem. Comparative discrete-time simulations and preliminary experimental measurements have been carried out for both topologies, showing how the new double feedback topology may increase PDO performance for some frequency ranges.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:27:54 GMT" } ]
2007-11-29T00:00:00
[ [ "Dominguez", "M.", "", "EA2523" ], [ "Pons", "Joan", "", "EA2523" ], [ "Ricart", "J.", "", "EA2523" ], [ "Juillard", "J.", "", "EA2523" ], [ "Colinet", "E.", "", "EA2523" ] ]
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711.328
Lei Liu
Liu Lei and Hu Fei
Chaotic behavior in the accretion disk
14 pages, 9 figures
null
null
null
astro-ph
null
The eccentric luminosity variation of quasars is still a mystery. Analytic results of this behavior ranged from multi-periodic behavior to a purely random process. Recently, we have used nonlinear time-series analysis to analyze the light curve of 3C 273 and found its eccentric behavior may be chaos [L. Liu, Chin. J. Astron. Astrophys. \textbf{6}, 663 (2006)]. This result induces us to look for some nonlinear mechanism to explain the eccentric luminosity variation. In this paper, we propose a simple non-linear accretion disk model and find it shows a kind of chaotic behavior under some circumstances. Then we compute the outburst energy $\triangle F$, defined as the difference of the maximum luminosity and the minimum luminosity, and the mean luminosity $<F>$. We find that $\triangle F\sim < F >^{\alpha}$ in the chaotic domain, where $\alpha\approx 1$. In this domain, we also find that $<F > \sim M^{0.5}$, where $M$ is the mass of central black hole. These results are confirmed by or compatible with some results from the observational data analysis [A. J. Pica and A. G. Smith, Astrophys. J. \textbf{272}, 11 (1983); M. Wold, M. S. Brotherton and Z. Shang, Mon. Not. R. Astron. Soc. \textbf{375}, 989 (2007)].
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:41:04 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 14:13:40 GMT" } ]
2008-03-26T00:00:00
[ [ "Lei", "Liu", "" ], [ "Fei", "Hu", "" ] ]
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711.3281
Amir Levinson
Amir Levinson and Omer Bromberg
Relativistic Photon Mediated Shocks
5 pages, a shorter version will appear in PRL
Phys.Rev.Lett.100:131101,2008
10.1103/PhysRevLett.100.131101
null
astro-ph
null
A system of equations governing the structure of a steady, relativistic radiation dominated shock is derived, starting from the general form of the transfer equation obeyed by the photon distribution function. Closure is obtained by truncating the system of moment equations at some order. The anisotropy of the photon distribution function inside the shock is shown to increase with increasing shock velocity, approaching nearly perfect beaming at upstream Lorentz factors $\Gamma_{-}>>1$. Solutions of the shock equations are presented for some range of upstream conditions. These solutions are shown to converge as the truncation order is increased.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 08:44:01 GMT" }, { "version": "v2", "created": "Mon, 24 Mar 2008 08:55:50 GMT" } ]
2009-06-23T00:00:00
[ [ "Levinson", "Amir", "" ], [ "Bromberg", "Omer", "" ] ]
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711.3282
Ying Li
Ying Li, Juan Hua
Study of Pure Annihilation Decays B_{d,s} \to D^{0} \bar D^{0}
13 pages, 4 figures
null
10.1088/1674-1137/32/10/003
null
hep-ph
null
With heavy quark limit and hierarchy approximation $\lambda_{QCD}\ll m_D\ll m_B$, we analyze the $B\to D^0\bar D^0$ and $B_s\to D^0\bar D^0$ decays, which occur purely via annihilation type diagrams. As a roughly estimation, we calculate their branching ratios and CP asymmetries in Perturbative QCD approach. The branching ratio of $B\to D^0\bar D^0$ is about $3.8\times10^{-5}$ that is just below the latest experimental upper limit. The branching ratio of $B_s\to D^0\bar D^0$ is about $6.8\times10^{-4}$, which could be measured in LHC-b. From the calculation, it could be found that this branching ratio is not sensitive to the weak phase angle $\gamma$. In these two decay modes, there exist CP asymmetries because of interference between weak and strong interaction. However, these asymmetries are too small to be measured easily.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:08:38 GMT" } ]
2015-05-13T00:00:00
[ [ "Li", "Ying", "" ], [ "Hua", "Juan", "" ] ]
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711.3283
Hansjoerg Seybold
Hansj\"org Seybold, Jos\'e S. Andrade Jr., Hans J. Herrmann
Modeling river delta formation
null
null
10.1073/pnas.0705265104
null
physics.geo-ph
null
A new model to simulate the time evolution of river delta formation process is presented. It is based on the continuity equation for water and sediment flow and a phenomenological sedimentation/ erosion law. Different delta types are reproduced using different parameters and erosion rules. The structures of the calculated patterns are analyzed in space and time and compared with real data patterns. Furthermore our model is capable to simulate the rich dynamics related to the switching of the mouth of the river delta. The simulation results are then compared with geological records for the Mississippi river.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:13:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Seybold", "Hansjörg", "" ], [ "Andrade", "José S.", "Jr." ], [ "Herrmann", "Hans J.", "" ] ]
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711.3284
EDA Publishing Association
Tsung-Hung Lin, Hsiharng Yang, Ching-Kong Chao
Concave Microlens Array Mold Fabrication in Photoresist Using UV Proximity Printing
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 and effective method to fabricate a polydimethyl-siloxane (PDMS) microlens array with a high fill factor, which utilizes the UV proximity printing and photoresist replication methods. The concave microlens array mold was made using a printing gap in lithography process, which utilizes optical diffraction of UV light to deflect away from the aperture edges and produces a certain exposure in the photoresist material outside the aperture edges. This method can precisely control the geometric profile of concave microlens array. The experimental results showed that the concave micro-lens array in photoresist could be formed automatically when the printing gap ranged from 240 micron to 720 micron. High fill factor microlens array can be produced, when the control pitch distance between the adjacent apertures of the concave microlens array was decreased to the aperture size.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:21:50 GMT" } ]
2007-11-29T00:00:00
[ [ "Lin", "Tsung-Hung", "" ], [ "Yang", "Hsiharng", "" ], [ "Chao", "Ching-Kong", "" ] ]
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711.3285
Ali Altintas
Azmi Ali Altintas, Metin Arik
The Inhomogeneous Invariance Quantum Supergroup of Supersymmetry Algebra
11 pages. No figure
Phys. Lett. A 372 (2008) 5955
10.1016/j.physleta.2008.07.070
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider an inhomogeneous quantum supergroup which leaves invariant a supersymmetric particle algebra. The quantum sub-supergroups of this inhomogeneous quantum supergroup are investigated.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:25:59 GMT" }, { "version": "v2", "created": "Sat, 15 Nov 2008 21:52:37 GMT" } ]
2008-11-15T00:00:00
[ [ "Altintas", "Azmi Ali", "" ], [ "Arik", "Metin", "" ] ]
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711.3286
EDA Publishing Association
Jing Li, L. Dedeng, Suntao Wu
The annealing induced extraordinary properties of SI based ZNO film grown by RF sputtering
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
Pb(Zr0.52Ti0.48)O3 (PZT) thin films were in situ deposited by pulsed laser deposition (PLD) on Pt/Ti/SiO2/Si substrates using a template layer derived by sol-gel method. A 0.1-$\mu$m-thick PZT layer with (111) or (100)-preferred orientation was first deposited onto Pt/Ti/SiO2/Si substrates using the sol-gel method, and than a PZT layer with thickness of 1$\mu$m was in situ deposited by PLD on the above-mentioned PZT layer. The crystalline phases and the preferred orientations of the PZT films were investigated by X-ray diffraction analysis. Surface and cross-sectional morphologies were observed by scanning electron microscopy and transmission electron microscopy. The electrical properties of the films were evaluated by measuring their P-E hysteresis loops and dielectric constants. The preferred orientation of the films can be controlled using the template layer derived by the sol-gel method. The deposition temperature required to obtain the perovskite phase in this process is approximately 460 degrees C, and is significantly lower than that in the case of direct film deposition by PLD on the Pt/Ti/SiO2/Si substrates. Keywords: lead zirconate titanate (PZT), thin film, sol-gel method, laser ablation, electrical properties
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:31:12 GMT" } ]
2007-11-29T00:00:00
[ [ "Li", "Jing", "" ], [ "Dedeng", "L.", "" ], [ "Wu", "Suntao", "" ] ]
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711.3287
EDA Publishing Association
S.-P. Vudathu, K.-K. Duganapalli, Rainer Laur, D. Kubalinska, A. Bunse-Gerstner
Parametric Yield Analysis of Mems via Statistical Methods
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 considers a developing theory on the effects of inevitable process variations during the fabrication of MEMS and other microsystems. The effects on the performance and design yield of the microsystems devices are analyzed and presented. A novel methodology in the design cycle of MEMS and other microsystems is briefly introduced. This paper describes the initial steps of this methodology that is aimed at counteracting the parametric variations in the product cycle of microsystems. It is based on a concept of worst-case analysis that has proven successful in the parent IC technology. Issues ranging from the level of abstraction of the microsystem models to the availability of such models are addressed
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:32:13 GMT" } ]
2007-11-29T00:00:00
[ [ "Vudathu", "S. -P.", "" ], [ "Duganapalli", "K. -K.", "" ], [ "Laur", "Rainer", "" ], [ "Kubalinska", "D.", "" ], [ "Bunse-Gerstner", "A.", "" ] ]
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711.3288
EDA Publishing Association
A. Giridhar (ESYCOM-Esiee, Ief), F. Verjus (ESYCOM-Esiee), F. Marty (IEF), A. Bosseboeuf (IEF), T. Bourouina (IEF)
Electrostatically-Driven Resonator on Soi with Improved Temperature Stability
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 deals with a single-crystal-silicon (SCS) MEMS resonator with improved temperature stability. While simulations have shown that the temperature coefficient of resonant frequency can be down to 1 ppm/degrees C, preliminary measurements on non-optimised structures gave evidence of a temperature coefficient of 29 ppm/degrees C. Design, optimisation, experimental results with post process simulation and prospective work are presented.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:32:31 GMT" } ]
2007-11-29T00:00:00
[ [ "Giridhar", "A.", "", "ESYCOM-Esiee, Ief" ], [ "Verjus", "F.", "", "ESYCOM-Esiee" ], [ "Marty", "F.", "", "IEF" ], [ "Bosseboeuf", "A.", "", "IEF" ], [ "Bourouina", "T.", "", "IEF" ] ]
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711.3289
EDA Publishing Association
S. Spinner, J. Bartholomeyczik, B. Becker, M. Doelle, O. Paul, I. Polian, R. Roth, K. Seitz, P. Ruther
Electromechanical Reliability Testing of Three-Axial Silicon Force Sensors
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 reports on the systematic electromechanical characterization of a new three-axial force sensor used in dimensional metrology of micro components. The siliconbased sensor system consists of piezoresistive mechanicalstress transducers integrated in thin membrane hinges supporting a suspended flexible cross structure. The mechanical behavior of the fragile micromechanical structure isanalyzed for both static and dynamic load cases. This work demonstrates that the silicon microstructure withstands static forces of 1.16N applied orthogonally to the front-side of the structure. A statistical Weibull analysis of the measured data shows that these values are significantly reduced if the normal force is applied to the back of the sensor. Improvements of the sensor system design for future development cycles are derived from the measurement results.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:33:12 GMT" } ]
2007-11-29T00:00:00
[ [ "Spinner", "S.", "" ], [ "Bartholomeyczik", "J.", "" ], [ "Becker", "B.", "" ], [ "Doelle", "M.", "" ], [ "Paul", "O.", "" ], [ "Polian", "I.", "" ], [ "Roth", "R.", "" ], [ "Seitz", "K.", "" ], [ "Ruther", "P.", "" ] ]
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711.329
EDA Publishing Association
O. Fran\c{c}ais, M.-C. Jullien (SATIE), L. Rousseau (ESYCOM-Esiee), P. Poulichet (ESYCOM-Esiee), S. Desportes (PPSM), A. Chouai (PPSM), J.-P. Lefevre (PPSM), J. Delaire (PPSM)
An Active Chaotic Micromixer Integrating Thermal Actuation Associating PDMS and Silicon Microtechnology
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
Due to scaling laws, in microfluidic, flows are laminar. Consequently, mixing between two liquids is mainly obtained by natural diffusion which may take a long time or equivalently requires centimetre length channels. To reduce time and length for mixing, it is possible to generate chaotic-like flows either by modifying the channel geometry or by creating an external perturbation of the flow. In this paper, an active micromixer is presented consisting on thermal actuation with heating resistors. In order to disturb the liquid flow, an oscillating transverse flow is generated by heating the liquid. Depending on the value of boiling point, either bubble expansion or volumetric dilation controlled the transverse flow amplitude. A chaotic like mixing is then induced under particular conditions depending on volume expansion, liquid velocity, frequency of actuation... This solution presents the advantage to achieve mixing in a very short time (1s) and along a short channel distance (channel width). It can also be integrated in a more complex device due to actuator integration with microfluidics.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:34:28 GMT" } ]
2007-11-29T00:00:00
[ [ "Français", "O.", "", "SATIE" ], [ "Jullien", "M. -C.", "", "SATIE" ], [ "Rousseau", "L.", "", "ESYCOM-Esiee" ], [ "Poulichet", "P.", "", "ESYCOM-Esiee" ], [ "Desportes", "S.", "", "PPSM" ], [ "Chouai", "A.", "", "PPSM" ], [ "Lefevre", "J. -P.", "", "PPSM" ], [ "Delaire", "J.", "", "PPSM" ] ]
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711.3291
EDA Publishing Association
J. Juillard, E. Colinet (LETI), M. Dominguez, Joan Pons, J. Ricart
Resolution Limits for Resonant Mems Sensors Based on Discrete Relay Feedback Techniques
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 devoted to the analysis of resonant MEMS sensors based on discrete relay feedback techniques. One drawback of such techniques is that some synchronization usually occurs between the discrete part and the continuous part of the system: this results in sensor responses that are very similar to the curves known as devil's staircases, i.e. the frequency does not vary smoothly with the sensor's input. The main contribution of this paper is a theoretical calculation of the resolution of such systems. The resolutions of two existing resonant MEMS architectures are then calculated and these results are discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:35:07 GMT" } ]
2007-11-29T00:00:00
[ [ "Juillard", "J.", "", "LETI" ], [ "Colinet", "E.", "", "LETI" ], [ "Dominguez", "M.", "" ], [ "Pons", "Joan", "" ], [ "Ricart", "J.", "" ] ]
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711.3292
EDA Publishing Association
X.-C. Shan, Z.-F. Wang, R. Maeda, Y.F. Sun, M. Wu, J.S. Hua
A Silicon-Based Micro Gas Turbine Engine for Power Generation
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 reports on our research in developing a micro power generation system based on gas turbine engine and piezoelectric converter. The micro gas turbine engine consists of a micro combustor, a turbine and a centrifugal compressor. Comprehensive simulation has been implemented to optimal the component design. We have successfully demonstrated a silicon-based micro combustor, which consists of seven layers of silicon structures. A hairpin-shaped design is applied to the fuel/air recirculation channel. The micro combustor can sustain a stable combustion with an exit temperature as high as 1600 K. We have also successfully developed a micro turbine device, which is equipped with enhanced micro air-bearings and driven by compressed air. A rotation speed of 15,000 rpm has been demonstrated during lab test. In this paper, we will introduce our research results major in the development of micro combustor and micro turbine test device.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:37:07 GMT" } ]
2007-11-29T00:00:00
[ [ "Shan", "X. -C.", "" ], [ "Wang", "Z. -F.", "" ], [ "Maeda", "R.", "" ], [ "Sun", "Y. F.", "" ], [ "Wu", "M.", "" ], [ "Hua", "J. S.", "" ] ]
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711.3293
Zurab Silagadze
O.I. Chashchina, Z.K. Silagadze
The dog-and-rabbit chase problem as an exercise in introductory kinematics
11 pages, 3 figures, authorship changed to match the published version
Latin Am. J. Phys. Educ. 3 (2009), 539-543
null
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of this article is to present a simple solution of the classic dog-and-rabbit chase problem which emphasizes the use of concepts of elementary kinematics and, therefore, can be used in introductory mechanics course. The article is based on the teaching experience of introductory mechanics course at Novosibirsk State University for first year physics students which are just beginning to use advanced mathematical methods in physics problems. We hope it will be also useful for students and teachers at other universities too.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 10:02:34 GMT" }, { "version": "v2", "created": "Tue, 6 Oct 2009 08:27:48 GMT" } ]
2009-10-06T00:00:00
[ [ "Chashchina", "O. I.", "" ], [ "Silagadze", "Z. K.", "" ] ]
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711.3294
EDA Publishing Association
Guillaume Savelli (LEG), Marc Plissonnier, Jacqueline Bablet, C. Salvi, J.M. Fournier
Energy Conversion Using New Thermoelectric Generator
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
During recent years, microelectronics helped to develop complex and varied technologies. It appears that many of these technologies can be applied successfully to realize Seebeck micro generators: photolithography and deposition methods allow to elaborate thin thermoelectric structures at the micro-scale level. Our goal is to scavenge energy by developing a miniature power source for operating electronic components. First Bi and Sb micro-devices on silicon glass substrate have been manufactured with an area of 1cm2 including more than one hundred junctions. Each step of process fabrication has been optimized: photolithography, deposition process, anneals conditions and metallic connections. Different device structures have been realized with different micro-line dimensions. Each devices performance will be reviewed and discussed in function of their design structure.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:40:31 GMT" } ]
2007-11-29T00:00:00
[ [ "Savelli", "Guillaume", "", "LEG" ], [ "Plissonnier", "Marc", "" ], [ "Bablet", "Jacqueline", "" ], [ "Salvi", "C.", "" ], [ "Fournier", "J. M.", "" ] ]
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711.3295
Geoffrey Sewell
Geoffrey Sewell
On Order, Disorder and Coherence
To be published in Modern Encyclopedia of Mathematical Physics
null
null
null
math-ph cond-mat.stat-mech math.MP quant-ph
null
We provide a brief survey of quantum statistical characterisations of order, disorder and coherence in systems of many degrees of freedom. Here, order and coherence are described in terms of symmetry breakdown, while disorder is described in terms of entropy and algorithmic complexity, whose interconnection has been recently extended from the classical to the quantum domain. We see that, in the present physical context, the concepts of order and disorder are not mutually antithetical, but bear an interrelationship similar to that between signals and noise.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:40:58 GMT" } ]
2007-11-22T00:00:00
[ [ "Sewell", "Geoffrey", "" ] ]
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711.3296
EDA Publishing Association
S. Oukassi, R. Salot, S. Bancel, J.-P. Pereira-Ramos
Above Ic Micro-Power Generators for RF-Mems
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 work presents recent advances in the development and the integration of an electrochemical (chemicalelectrical energy conversion) micro power generator used as a high voltage energy source for RF-MEMS powering. Autonomous MEMS require similarly miniaturized power sources. Up to day, solid state thin film batteries are realized with mechanical masks. This method doesn't allow dimensions below a few mm^2 active area, and besides the whole process flow is done under controlled atmosphere so as to ensure materials chemical stability (mainly lithiated materials). Within this context, Microelectronics micro-fabrication procedures (photolithography, Reactive Ion Etching...) are used to reach both miniaturisation (100x100 $\mu$m^2 targeted unit cell active area) and Above IC technological compatibility. All process steps developed here are realized in clean room environment.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:42:06 GMT" } ]
2007-11-29T00:00:00
[ [ "Oukassi", "S.", "" ], [ "Salot", "R.", "" ], [ "Bancel", "S.", "" ], [ "Pereira-Ramos", "J. -P.", "" ] ]
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711.3297
EDA Publishing Association
M.-K. El Khatib (XLIM), A. Pothier (XLIM), P. Blondy (XLIM)
Packaging of RF Mems Switching Functions on Alumina Substrate
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
Recently the strong demands in wireless communication requires expanding development for the application of RF MEMS (Radio Frequency micro electro mechanical systems) sensing devices such as micro-switches, tunable capacitors because it offers lower power consumption, lower losses, higher linearity and higher Q factors compared with conventional communications components. To accelerate commercialisation of RF MEMS products, development for packaging technologies is one of the most critical issues should be solved beforehand.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:44:39 GMT" } ]
2007-11-29T00:00:00
[ [ "Khatib", "M. -K. El", "", "XLIM" ], [ "Pothier", "A.", "", "XLIM" ], [ "Blondy", "P.", "", "XLIM" ] ]
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711.3298
EDA Publishing Association
T. Pichonat (FEMTO-ST - Lopmd), B. Gauthier-Manuel (FEMTO-ST - Lopmd)
Recent Developments in Mems-Based Micro Fuel Cells
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
Micro fuel cells ($\mu$-FC) represent promising power sources for portable applications. Today, one of the technological ways to make $\mu$-FC is to have recourse to standard microfabrication techniques used in the fabrication of micro electromechanical systems (MEMS). This paper shows an overview on the applications of MEMS techniques on miniature FC by presenting several solutions developed throughout the world. It also describes the latest developments of a new porous silicon-based miniature fuel cell. Using a silane grafted on an inorganic porous media as the proton-exchange membrane instead of a common ionomer such as Nafion, the fuel cell achieved a maximum power density of 58 mW cm-2 at room temperature with hydrogen as fuel.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:45:58 GMT" } ]
2007-11-29T00:00:00
[ [ "Pichonat", "T.", "", "FEMTO-ST - Lopmd" ], [ "Gauthier-Manuel", "B.", "", "FEMTO-ST - Lopmd" ] ]
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711.3299
EDA Publishing Association
W. Faris, H. Mohammed, M.M. Abdalla, C.-H. Ling
Influence of Micro-Cantilever Geometry and Gap on Pull-in Voltage
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, we study the behaviour of a microcantilever beam under electrostatic actuation using finite difference method. This problem has a lot of applications in MEMS based devices like accelerometers, switches and others. In this paper, we formulated the problem of a cantilever beam with proof mass at its end and carried out the finite difference solution. we studied the effects of length, width, and the gap size on the pull-in voltage using data that are available in the literature. Also, the stability limit is compared with the single degree of freedom commonly used in the earlier literature as an approximation to calculate the pull-in voltage.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:45:58 GMT" } ]
2007-11-29T00:00:00
[ [ "Faris", "W.", "" ], [ "Mohammed", "H.", "" ], [ "Abdalla", "M. M.", "" ], [ "Ling", "C. -H.", "" ] ]
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711.33
EDA Publishing Association
Ming-Tzer Lin, Chi-Jia Tong, Chung-Hsun Chiang
Design and Development of Novel Electroplating Spring Frame Mems Structure Specimens for the Microtensile Testing of Thin Film Materials
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
Microelectromechanical systems (MEMS) technologies are developing rapidly with increasing study of the design, fabrication and commercialization of microscale systems and devices. Accurate mechanical properties are important for successful design and development of MEMS. We have demonstrated here a novel electroplating spring frame MEMS Structure Specimen integrates pin-pin align holes, misalignment compensate spring structure frame, load sensor beam and freestanding thin film. The specimen can be fit into a specially designed microtensile apparatus which is capable of carrying out a series of tests on sub-micro scale freestanding thin films.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:46:32 GMT" } ]
2007-11-29T00:00:00
[ [ "Lin", "Ming-Tzer", "" ], [ "Tong", "Chi-Jia", "" ], [ "Chiang", "Chung-Hsun", "" ] ]
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711.3301
EDA Publishing Association
P. Szabo, B. Nemeth, M. Rencz, B. Courtois (TIMA)
Characterisation of the Etching Quality in Micro-Electro-Mechanical Systems by Thermal Transient Methodology
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
Our paper presents a non-destructive thermal transient measurement method that is able to reveal differences even in the micron size range of MEMS structures. Devices of the same design can have differences in their sacrificial layers as consequence of the differences in their manufacturing processes e.g. different etching times. We have made simulations examining how the etching quality reflects in the thermal behaviour of devices. These simulations predicted change in the thermal behaviour of MEMS structures having differences in their sacrificial layers. The theory was tested with measurements of similar MEMS devices prepared with different etching times. In the measurements we used the T3Ster thermal transient tester equipment. The results show that deviations in the devices, as consequence of the different etching times, result in different temperature elevations and manifest also as shift in time in the relevant temperature transient curves.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:46:34 GMT" } ]
2007-11-29T00:00:00
[ [ "Szabo", "P.", "", "TIMA" ], [ "Nemeth", "B.", "", "TIMA" ], [ "Rencz", "M.", "", "TIMA" ], [ "Courtois", "B.", "", "TIMA" ] ]
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711.3302
EDA Publishing Association
D. Allen, N. Duclos, I. Garbutt, M. Saumer, Ch. Dhum, M. Schmitt, J. E. Hoffmann
The Effects of Additives on the Physical Properties of Electroformed Nickel and on the Stretch of Photoelectroformed Nickel Components
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 process of nickel electroforming is becoming increasingly important in the manufacture of MST products, as it has the potential to replicate complex geometries with extremely high fidelity. Electroforming of nickel uses multi-component electrolyte formulations in order to maximise desirable product properties. In addition to nickel sulphamate (the major electrolyte component), formulation additives can also comprise nickel chloride (to increase nickel anode dissolution), sulphamic acid (to control pH), boric acid (to act as a pH buffer), hardening/levelling agents (to increase deposit hardness and lustre) and wetting agents (to aid surface wetting and thus prevent gas bubbles and void formation). This paper investigates the effects of some of these variables on internal stress and stretch as a function of applied current density.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:47:35 GMT" } ]
2007-11-29T00:00:00
[ [ "Allen", "D.", "" ], [ "Duclos", "N.", "" ], [ "Garbutt", "I.", "" ], [ "Saumer", "M.", "" ], [ "Dhum", "Ch.", "" ], [ "Schmitt", "M.", "" ], [ "Hoffmann", "J. E.", "" ] ]
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711.3303
Thorsten Renk
Thorsten Renk, Kari J. Eskola
Expectations for dihadron correlation measurements at the LHC
9 pages, 7 figures
Phys.Rev.C77:044905,2008
10.1103/PhysRevC.77.044905
null
hep-ph
null
The suppression of high transverse momentum (P_T) inclusive hadron spectra in heavy-ion collisions as compared to the scaled expectation of high P_T hadron production in p-p collisions is the most direct manifestation of the interaction of hard partons with the soft bulk medium produced in heavy-ion collisions which is absent in p-p collisions. Yet the measured nuclear suppression factor R_AA is a very averaged quantity and hence only a limited amount of information about the medium evolution and the nature of the interaction with the medium can be deduced from R_AA. Measurements of hard back-to-back hadron correlations in 200 AGeV Au-Au collisions at RHIC have opened a new window to study the energy loss of partons in a medium in a more differential way and for a different distribution of in-medium pathlengths than in the case of R_AA. In this work, we present an extrapolation of our results for back-to-back yields at RHIC energies to 5.5 TeV Pb-Pb collisions at the CERN LHC. We also discuss differences and similarities between the measurement at RHIC.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:48:08 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 08:56:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Renk", "Thorsten", "" ], [ "Eskola", "Kari J.", "" ] ]
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711.3304
EDA Publishing Association
Gou-Jen Wang, Yi-Chin Lin, Gwo-Sen Lin
A Novel Contact Resistance Model of Anisotropic Conductive Film for FPD Packaging
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 research, a novel contact resistance model for the flat panel display (FPD) packaging based on the within layer parallel and between layers series resistance concepts was proposed. The FJ2530 anisotropic conductive films (ACF) by Sony Inc. containing the currently smallest 3micron conductive particles was used to conduct the experiments to verify the accuracy of the proposed model. Calculated resistance of the chip-on-glass (COG) packaging by the proposed model is 0.163\Omega. It is found that the gold bump with 0.162\Omega resistance play the major role of the overall resistance. Although the predicted resistance by the proposed model is only one third of the experimentally measured value, it has been three-fold improvement compared to the existing models.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:48:35 GMT" } ]
2007-11-29T00:00:00
[ [ "Wang", "Gou-Jen", "" ], [ "Lin", "Yi-Chin", "" ], [ "Lin", "Gwo-Sen", "" ] ]
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711.3305
EDA Publishing Association
A. Bennis, C. Leinenbach, C. Raudzis, R. M\"uller-Fiedler, S. Kronm\"uller
Measurement Technique for Elastic and Mechanical Properties of Polycrystalline Silicon-Germanium Films Using Surface Acoustic Waves and Projection Masks
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
Using Rayleigh surface acoustic waves (SAW), the Young's modulus, the density and the thickness of polycrystalline Silicon-Germanium (SiGe) films deposited on silicon and SiO2 were measured, in excellent agreement with theory. The dispersion curve of the propagating SAW is calculated with a Boundary Element Method (BEM)-Model based on Green's functions. The propagating SAW is generated with a nanosecond laser in a narrowband scheme projecting stripes from a mask on the surface of the sample. For this purpose a glass mask and a liquid crystal display (LCD) mask are used. The slope of the SAW is then measured using a probe beam setup. From the wavelength of the mask and the frequency of the measured SAW, the dispersion curve is determined point by point. Fitting the BEM-Model to the measured nonlinear dispersion curve provides several physical parameters simultaneously. In the present work this is demonstrated for the Young's modulus, the density and the thickness of SiGe films. The results from the narrowband scheme measurement are in excellent agreement with separated measurements of the thickness (profilometer), the density (balance) and the Young's modulus (nanoindenter).
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:51:13 GMT" } ]
2007-11-29T00:00:00
[ [ "Bennis", "A.", "" ], [ "Leinenbach", "C.", "" ], [ "Raudzis", "C.", "" ], [ "Müller-Fiedler", "R.", "" ], [ "Kronmüller", "S.", "" ] ]
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711.3306
EDA Publishing Association
Ja-Myeong Koo, Seung-Boo Jung
Effect of Surface Finish of Substrate on Mechanical Reliability of in-48SN Solder Joints in Moems Package
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
Interfacial reactions and shear properties of the In-48Sn (in wt.%) ball grid array (BGA) solder joints after bonding were investigated with four different surface finishes of the substrate over an underlying Cu pad: electroplated Ni/Au (hereafter E-NG), electroless Ni/immersion Au (hereafter ENIG), immersion Ag (hereafter I-Ag) and organic solderability preservative (hereafter OSP). During bonding, continuous AuIn2, Ni3(Sn,In)4 and Cu6(Sn,In)5 intermetallic compound (IMC) layers were formed at the solder/E-NG, solder/ENIG and solder/OSP interface, respectively. The interfacial reactions between the solder and I-Ag substrate during bonding resulted in the formation of Cu6(Sn,In)5 and Cu(Sn,In)2 IMCs with a minor Ag element. The In-48Sn/I-Ag solder joint showed the best shear properties among the four solder joints after bonding, whereas the solder/ENIG solder joint exhibited the weakest mechanical integrity.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:52:02 GMT" } ]
2007-11-29T00:00:00
[ [ "Koo", "Ja-Myeong", "" ], [ "Jung", "Seung-Boo", "" ] ]
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711.3307
Jaime Merino
J. Merino, M. Dumm, N. Drichko, M. Dressel, and Ross H. McKenzie
Quasiparticles at the verge of localization near the Mott metal-insulator transition in a two-dimensional material
5 pages, 4 figures
Phys. Rev. Lett. 100, 086404 (2008)
10.1103/PhysRevLett.100.086404
null
cond-mat.str-el cond-mat.mtrl-sci
null
The dynamics of charge carriers close to the Mott transition is explored theoretically and experimentally in the quasi two-dimensional organic charge-transfer salt $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br$_x$Cl$_{1-x}$, with varying Br content. The frequency dependence of the conductivity deviates significantly from simple Drude model behavior: there is a strong redistribution of spectral weight as the Mott transition is approached and with temperature. The effective mass of the quasiparticles increases considerably when coming close to the insulating phase. A dynamical mean-field-theory treatment of the relevant Hubbard model gives a good quantitative description of the experimental data.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 09:53:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Merino", "J.", "" ], [ "Dumm", "M.", "" ], [ "Drichko", "N.", "" ], [ "Dressel", "M.", "" ], [ "McKenzie", "Ross H.", "" ] ]
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