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801.0973 | Mehmet Oktay Dr | A.\'O Cais (Adelaide University), M. B .Oktay, S. M. Ryan, M. J.
Peardon (Trinity College), J. I. Skullerud (NUI Maynooth) | The spectrum of charmed mesons from dynamical anisotropic lattices | 4 pages, 4 figures, Talk given at International Conference on Hadron
Physics, TROIA'07, Canakkale Turkey, 30 August - 3 September 2007 | null | null | null | hep-lat | null | We present our preliminary analysis for the chamonium and D$_s$ spectra
obtained from N$_f=2$ dynamical anisotropic lattices. We use 12$^3\times 80$
lattices with lattice spacing $a_t=7.35$ GeV$^{-1}$ and anisotropy of six.
Meson correlators are computed using all-to-all propagators together with
variational analysis.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:57:33 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Cais",
"A. Ó",
"",
"Adelaide University"
],
[
"Oktay",
"M. B .",
"",
"Trinity College"
],
[
"Ryan",
"S. M.",
"",
"Trinity College"
],
[
"Peardon",
"M. J.",
"",
"Trinity College"
],
[
"Skullerud",
"J. I.",
"",
"NUI Maynooth"
]
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801.0974 | Matthew Kunz | Matthew W. Kunz | On the Linear Stability of Weakly-Ionized, Magnetized Planar Shear Flows | 18 pages, 8 figures; accepted by MNRAS | null | 10.1111/j.1365-2966.2008.12928.x | null | astro-ph | null | We investigate the effects of ambipolar diffusion and the Hall effect on the
stability of weakly-ionized, magnetized planar shear flows. Employing a local
approach similar to the shearing-sheet approximation, we solve for the
evolution of linear perturbations in both streamwise-symmetric and
non-streamwise-symmetric geometries using WKB techniques and/or numerical
methods. We find that instability arises from the combination of shear and
non-ideal magnetohydrodynamic processes, and is a result of the ability of
these processes to influence the free energy path between the perturbations and
the shear. They turn what would be simple linear-in-time growth due to current
and vortex stretching from shear into exponentially-growing instabilities. Our
results aid in understanding previous work on the behaviour of weakly-ionized
accretion discs. In particular, the recent finding that the Hall effect and
ambipolar diffusion destabilize both positive and negative angular velocity
gradients acquires a natural explanation in the more general context of this
paper. We construct a simple toy model for these instabilities based upon
transformation operators (shears, rotations, and projections) that captures
both their qualitative and, in certain cases, exact quantitative behaviour.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:09:00 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Kunz",
"Matthew W.",
""
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801.0975 | J. S. Kaastra | P. Richter, F.B.S. Paerels, J.S. Kaastra | FUV and X-ray absorption in the Warm-Hot Intergalactic Medium | 26 pages, 9 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 3; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9325-4 | null | astro-ph | null | The Warm-Hot Intergalactic Medium (WHIM) arises from shock-heated gas
collapsing in large-scale filaments and probably harbours a substantial
fraction of the baryons in the local Universe. Absorption-line measurements in
the ultraviolet (UV) and in the X-ray band currently represent the best method
to study the WHIM at low redshifts. We here describe the physical properties of
the WHIM and the concepts behind WHIM absorption line measurements of H I and
high ions such as O VI, O VII, and O VIII in the far-ultraviolet and X-ray
band. We review results of recent WHIM absorption line studies carried out with
UV and X-ray satellites such as FUSE, HST, Chandra, and XMM-Newton and discuss
their implications for our knowledge of the WHIM.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:41:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Richter",
"P.",
""
],
[
"Paerels",
"F. B. S.",
""
],
[
"Kaastra",
"J. S.",
""
]
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] |
801.0976 | Yann Rebille | Yann Rebille | Laws of Large Numbers for Continuous Belief Measures on Compact Spaces | This paper has been withdrawn by the author, due a publication. 18
pages | null | null | null | math.PR math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove for outer continuous belief measures defined on compact spaces
strong and weak laws of large numbers as Kolmogorov's one for measures. These
results contribute to M. Marinacci's (Journal of Economic Theory 84 (1999)
145-195) though with different methods.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:42:59 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Jun 2009 20:44:35 GMT"
}
] | 2009-06-02T00:00:00 | [
[
"Rebille",
"Yann",
""
]
] | [
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801.0977 | J. S. Kaastra | F. Durret, J.S. Kaastra, J. Nevalainen, T. Ohashi, N. Werner | Soft X-ray and extreme ultraviolet excess emission from clusters of
galaxies | 21 pages, 5 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 4; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M.Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9313-8 | null | astro-ph | null | An excess over the extrapolation to the extreme ultraviolet and soft X-ray
ranges of the thermal emission from the hot intracluster medium has been
detected in a number of clusters of galaxies. We briefly present each of the
satellites (EUVE, ROSAT PSPC and BeppoSAX, and presently XMM-Newton, Chandra
and Suzaku) and their corresponding instrumental issues, which are responsible
for the fact that this soft excess remains controversial in a number of cases.
We then review the evidence for this soft X-ray excess and discuss the possible
mechanisms (thermal and non-thermal) which could be responsible for this
emission.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:49:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Durret",
"F.",
""
],
[
"Kaastra",
"J. S.",
""
],
[
"Nevalainen",
"J.",
""
],
[
"Ohashi",
"T.",
""
],
[
"Werner",
"N.",
""
]
] | [
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] |
801.0978 | Taekyun Kim | Taekyun Kim | On the multiple q-Genocchi and Euler numbers | 11 pages | null | 10.1134/S1061920808040055 | null | math.NT | null | The purpose of this paper is to present a systemic study of some families of
multiple q-Genocchi and euler numbers by using multivariate q-Volkenborn
integral. From the studies of those q-Genocchi numbers and polynomials of
higher order we derive some interesting identities related to q-Genocchi
numbers and polynomials of higher order.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:49:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Taekyun",
""
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] |
801.0979 | Frederic Grosshans | Vincent Jacques (LPQM), E. Wu (LPQM), Fr\'ed\'eric Grosshans (LPQM),
Fran\c{c}ois Treussart (LPQM), Philippe Grangier (LCFIO), Alain Aspect
(LCFIO), Jean-Fran\c{c}ois Roch (LPQM) | Delayed-choice test of complementarity with single photons | null | null | 10.1103/PhysRevLett.100.220402 | null | quant-ph | null | We report an experimental test of complementarity using clock-triggered
single-photon pulses emitted by an individual N-V color center in a diamond
nanocrystal. The single photons are sent into a Mach-Zehnder interferometer
with an output beamsplitter of adjustable reflection coefficient R. In
addition, the choice of introducing or removing this beamsplitter is random and
relativistically space-like separated from the entering of the photon inside
the interferometer, as required for the Wheeler's delayed-choice regime. Each
set value of R allows us to observe interference with visibility V and to
obtain incomplete which-path information characterized by the
distinguishability D. The measured values of V and D are found to obey the
complementarity relation V^2 + D^2 =< 1.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:53:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jacques",
"Vincent",
"",
"LPQM"
],
[
"Wu",
"E.",
"",
"LPQM"
],
[
"Grosshans",
"Frédéric",
"",
"LPQM"
],
[
"Treussart",
"François",
"",
"LPQM"
],
[
"Grangier",
"Philippe",
"",
"LCFIO"
],
[
"Aspect",
"Alain",
"",
"LCFIO"
],
[
"Roch",
"Jean-François",
"",
"LPQM"
]
] | [
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] |
801.098 | Gert De Cooman | Gert de Cooman, Filip Hermans, Erik Quaeghebeur | Imprecise Markov chains and their limit behaviour | v1: 28 pages, 8 figures; v2: 31 pages, 9 figures, major revision
after review: added, modified, and removed material (no results dropped,
results added), moved proofs to an appendix | null | 10.1017/S0269964809990039 | null | math.PR math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the initial and transition probabilities of a finite Markov chain in
discrete time are not well known, we should perform a sensitivity analysis.
This can be done by considering as basic uncertainty models the so-called
credal sets that these probabilities are known or believed to belong to, and by
allowing the probabilities to vary over such sets. This leads to the definition
of an imprecise Markov chain. We show that the time evolution of such a system
can be studied very efficiently using so-called lower and upper expectations,
which are equivalent mathematical representations of credal sets. We also study
how the inferred credal set about the state at time n evolves as n goes to
infinity: under quite unrestrictive conditions, it converges to a uniquely
invariant credal set, regardless of the credal set given for the initial state.
This leads to a non-trivial generalisation of the classical Perron-Frobenius
Theorem to imprecise Markov chains.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:54:04 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Feb 2009 16:37:09 GMT"
}
] | 2009-11-24T00:00:00 | [
[
"de Cooman",
"Gert",
""
],
[
"Hermans",
"Filip",
""
],
[
"Quaeghebeur",
"Erik",
""
]
] | [
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] |
801.0981 | Marcel Ausloos | Andrzej Pekalski (Wroclaw) and Marcel Ausloos (Liege) | Risk of Population Extinction from Periodic and Abrupt Changes of
Environment | 8 pages, 25 references, 10 figures; preliminary version to be
submitted to Physica A | Physica 387 (2008) 2526-34 | 10.1016/j.physa.2008.01.001 | null | nlin.AO | null | A simulation model of a population having internal (genetic) structure is
presented. The population is subject to selection pressure coming from the
environment which is the same in the whole system but changes in time.
Reproduction has a sexual character with recombination and mutation. Two cases
are considered - oscillatory changes of the environment and abrupt ones
(catastrophes). We show how the survival chance of a population depends on
maximum allowed size of the population, the length of the genotypes
characterising individuals, selection pressure and the characteristics of the
climate changes, either their period of oscillations or the scale of the abrupt
shift.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:24:47 GMT"
}
] | 2012-08-31T00:00:00 | [
[
"Pekalski",
"Andrzej",
"",
"Wroclaw"
],
[
"Ausloos",
"Marcel",
"",
"Liege"
]
] | [
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801.0982 | J. S. Kaastra | Y. Rephaeli, J. Nevalainen, T. Ohashi, A.M. Bykov | Nonthermal phenomena in clusters of galaxies | 23 pages, 7 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 5; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9314-7 | null | astro-ph | null | Recent observations of high energy (> 20 keV) X-ray emission in a few
clusters of galaxies broaden our knowledge of physical phenomena in the
intracluster space. This emission is likely to be nonthermal, probably
resulting from Compton scattering of relativistic electrons by the cosmic
microwave background (CMB) radiation. Direct evidence for the presence of
relativistic electrons in some 50 clusters comes from measurements of extended
radio emission in their central regions. We briefly review the main results
from observations of extended regions of radio emission, and Faraday rotation
measurements of background and cluster radio sources. The main focus of the
review are searches for nonthermal X-ray emission conducted with past and
currently operating satellites, which yielded appreciable evidence for
nonthermal emission components in the spectra of a few clusters. This evidence
is clearly not unequivocal, due to substantial observational and systematic
uncertainties, in addition to virtually complete lack of spatial information.
If indeed the emission has its origin in Compton scattering of relativistic
electrons by the CMB, then the mean magnetic field strength and density of
relativistic electrons in the cluster can be directly determined. Knowledge of
these basic nonthermal quantities is valuable for the detailed description of
processes in intracluster gas and for the origin of magnetic fields.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:56:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rephaeli",
"Y.",
""
],
[
"Nevalainen",
"J.",
""
],
[
"Ohashi",
"T.",
""
],
[
"Bykov",
"A. M.",
""
]
] | [
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801.0983 | Timothy Clifton | Timothy Clifton | The Parameterised Post-Newtonian Limit of Fourth-Order Theories of
Gravity | 12 pages | Phys.Rev.D77:024041,2008 | 10.1103/PhysRevD.77.024041 | null | gr-qc astro-ph | null | We determine the full post-Newtonian limit of theories of gravity that extend
general relativity by replacing the Ricci scalar, R, in the generating
Lagrangian by some analytic function, f(R). We restrict ourselves to theories
that admit Minkowski space as a suitable background, and perform a perturbative
expansion in the manner prescribed by the parameterised post-Newtonian
formalism. Extra potentials are found to be present that are not accounted for
in the usual treatment, and a discussion is provided on how they may be used to
observationally distinguished these theories from general relativity at the
post-Newtonian level.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:59:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Clifton",
"Timothy",
""
]
] | [
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801.0984 | Yann Rebille | Yann Rebille | Law of large numbers for non-additive measures | This paper has been withdrawn by the author, due a publication. 12
pages | null | null | null | math.PR math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our aim is to give for some classes non-additive measures some limit
theorems. For balanced games we obtain a weak and strong law of large numbers
for bounded random variables, a sharper conclusion is obtain with exact games.
We provide an extension to upper enveloppe measures.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 13:59:48 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Jun 2009 20:47:29 GMT"
}
] | 2009-06-02T00:00:00 | [
[
"Rebille",
"Yann",
""
]
] | [
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] |
801.0985 | J. S. Kaastra | C. Ferrari, F. Govoni, S. Schindler, A.M. Bykov, Y. Rephaeli | Observations of extended radio emission in clusters | 27 pages, 7 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 6; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9311-x | null | astro-ph | null | We review observations of extended regions of radio emission in clusters;
these include diffuse emission in `relics', and the large central regions
commonly referred to as `halos'. The spectral observations, as well as Faraday
rotation measurements of background and cluster radio sources, provide the main
evidence for large-scale intracluster magnetic fields and significant densities
of relativistic electrons. Implications from these observations on acceleration
mechanisms of these electrons are reviewed, including turbulent and shock
acceleration, and also the origin of some of the electrons in collisions of
relativistic protons by ambient protons in the (thermal) gas. Improved
knowledge of non-thermal phenomena in clusters requires more extensive and
detailed radio measurements; we briefly review prospects for future
observations.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:03:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ferrari",
"C.",
""
],
[
"Govoni",
"F.",
""
],
[
"Schindler",
"S.",
""
],
[
"Bykov",
"A. M.",
""
],
[
"Rephaeli",
"Y.",
""
]
] | [
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801.0986 | Chang Qing Sun Dr | Chang Q. Sun | Tetra-bonding of C, N and O at solid surface | Book Chapter (invited) | null | null | null | cond-mat.mtrl-sci | null | In order to gain advanced understanding of the kinetics and dynamics of C, N,
and O reacting with a solid surface, it is necessary to consider the reaction
from the perspectives of bond formation, bond dissociation, bond relaxation,
bond vibration, and the associated charge redistribution and polarization and
the energetic response of the involved atoms and valence electrons. The
sp-orbital hybridization is found necessary for these concerned reactions
associated with strongly anisotropic bonding and valence identities and the
localized energy states of bonding pairs, nonbonding lone pairs, and the lone
pair induced antibonding dipoles, as well as the hydrogen bond like and C-H
bond like states, which could unify the observations using atomistic
microscopy, crystallography, electronic spectroscopy, vibronic spectroscopy,
and thermal desorption spectroscopy and provide guidelines for materials
design.
| [
{
"version": "v1",
"created": "Sat, 5 Jan 2008 02:36:56 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Sun",
"Chang Q.",
""
]
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801.0987 | Marco Baumgartl | Marco Baumgartl and Ivo Sachs | Open-Closed String Correspondence in Open String Field Theory | Based on a talk given at the BW2007 workshop "Challenges Beyond the
Standard Model", Kladovo, Serbia. To be published in Fortschritte der Physik | Fortsch.Phys.56:343-351,2008 | 10.1002/prop.200710505 | null | hep-th | null | We address the problem of describing different closed string backgrounds in
background independent open string field theory: A shift in the closed string
background corresponds to a collective excitation of open strings. As an
illustration we apply the formalism to the case where the closed string
background is a group manifold.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:08:17 GMT"
}
] | 2009-01-30T00:00:00 | [
[
"Baumgartl",
"Marco",
""
],
[
"Sachs",
"Ivo",
""
]
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801.0988 | Davide Gaiotto | Davide Gaiotto | Monster symmetry and Extremal CFTs | 10 pages | null | null | null | hep-th | null | We test some recent conjectures about extremal selfdual CFTs, which are the
candidate holographic duals of pure gravity in $AdS_3$. We prove that no $c=48$
extremal selfdual CFT or SCFT may possess Monster symmetry. Furthermore, we
disprove a recent argument against the existence of extremal selfdual CFTs of
large central charge.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:09:30 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Gaiotto",
"Davide",
""
]
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] |
801.0989 | Lionel Prat | Lionel Prat (1), Jerome Rodriguez (1) and Diana C. Hannikainen (2)
((1) CEA Saclay, (2) Observatory, University of Helsinki) | RXTE and INTEGRAL observations of IGR J19140+0951 | Proceedings of "A Population Explosion: The Nature and Evolution of
X-ray Binaries in Diverse Environments", St. Petersburg Beach, Florida, USA,
28 October - 2 November, 2007, 3 pages, 1 figure | AIP Conf.Proc.1010:266-268,2008 | 10.1063/1.2945055 | null | astro-ph | null | We have used the RXTE and INTEGRAL satellites simultaneously to observe the
High Mass X-ray binary IGR J19140+0951. The spectra obtained in the 3-80 keV
range have allowed us to perform a precise spectral analysis of the system
along its binary orbit. The spectral evolution confirms the supergiant nature
of the companion star and the neutron star nature of the compact object. Using
a simple stellar wind model to describe the evolution of the photoelectric
absorption, we were able to restrict the orbital inclination angle in the range
37-75 degrees. This analysis leads to a wind mass-loss rate from the companion
star of ~ 10e-7 Msun/year, consistent with its expected spectral type. We have
detected a soft excess in at least three observations, for the first time for
this source. Such soft excesses have been reported in several HMXBs in the
past. We discuss the possible origin of this excess, and suggest, based on its
spectral properties and occurrences prior to the superior conjunction, that it
may be explained as the reprocessing of the X-ray emission originating from the
neutron star by the surrounding ionised gas.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:14:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Prat",
"Lionel",
"",
"CEA Saclay"
],
[
"Rodriguez",
"Jerome",
"",
"CEA Saclay"
],
[
"Hannikainen",
"Diana C.",
"",
"Observatory, University of Helsinki"
]
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] |
801.099 | Michael L. Balogh | Michael L. Balogh (1), Ian G. McCarthy (2), Richard G. Bower (2),
Vincent R. Eke (2) ((1) University of Waterloo, (2) Durham University) | Testing Cold Dark Matter with the hierarchical buildup of stellar light | MNRAS, in press. 13 typeset pages | null | 10.1111/j.1365-2966.2008.12903.x | null | astro-ph | null | (Abridged) We demonstrate that the tenet of hierarchical structure growth
leads directly to a robust, falsifiable prediction for the correlation between
stellar fraction (fstar) and total system mass (M500) of galaxy groups and
clusters. This prediction is relatively insensitive to the details of baryonic
physics or cosmological parameters. In particular, if the fstar-M500 relation
is fixed and does not evolve with redshift, CDM models predict the logarithmic
slope of this relation to be b>-0.3. This constraint can be weakened if the
fstar-M500 relation evolves strongly, but this implies more stars must be
formed in situ in groups at low redshift. Conservatively requiring that at
least half the stars in groups were formed by z=1, the constraint from
evolution models is b>-0.35. Since the most massive clusters (M500=1E15 Msun)
are observed to have fstar=0.01, this means that groups with M500=5E13 Msun
must have fstar<0.03. Recent observations by Gonzalez et al. (2007) indicate a
much steeper relation, with fstar>0.04 in groups, leading to b=-0.64. If
confirmed, this would rule out hierarchical structure formation models: today's
clusters could not have been built from today's groups, or even from the
higher-redshift progenitors of those groups. We perform a careful analysis of
these and other data to identify the most important systematic uncertainties in
their measurements. Although correlated uncertainties on stellar and total
masses might explain the steep observed relation, the data are only consistent
with theory if the observed group masses are systematically underestimated.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:52:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Balogh",
"Michael L.",
"",
"University of Waterloo"
],
[
"McCarthy",
"Ian G.",
"",
"Durham University"
],
[
"Bower",
"Richard G.",
"",
"Durham University"
],
[
"Eke",
"Vincent R.",
"",
"Durham University"
]
] | [
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801.0991 | Jonathan Perkin Dr | J. Perkin | The Acoustic Detection of Ultra High Energy Neutrinos | PhD Thesis: The University of Sheffield; England. (Submitted April
2007) | null | null | null | astro-ph | null | Attempts have been made to parameterise the thermoacoustic emission of
particle cascades induced by EeV neutrinos interacting in the sea.
Understanding the characteristic radiation from such an event allows us to
predict the pressure pulse observed by underwater acoustic sensors distributed
in kilometre scale arrays. We find that detectors encompassing thousands of
cubic kilometres are required, with a minimum of 100 hydrophones per kilometre
cubed, in order to observe the flux of neutrinos predicted by the attenuation
of ultra high energy cosmic rays on cosmic microwave background photons. The
pressure threshold of such an array must be in the range 5-10 mPa and the said
detector will have to operate for five years or more. Additionally a
qualitative analysis of the first acoustic data recorded by the Rona hydrophone
array off the north-west coast of Scotland is reported.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:17:59 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Perkin",
"J.",
""
]
] | [
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] |
801.0992 | Wenxian Zhang | Wenxian Zhang, N. P. Konstantinidis, V. V. Dobrovitski, B. N. Harmon,
Lea F. Santos, Lorenza Viola | Long-time electron spin storage via dynamical suppression of
hyperfine-induced decoherence in a quantum dot | 16 pages, 10 figures, submitted to Phys. Rev. B | Phys. Rev. B 77, 125336 (2008). | 10.1103/PhysRevB.77.125336 | null | cond-mat.mes-hall cond-mat.other quant-ph | null | The coherence time of an electron spin decohered by the nuclear spin
environment in a quantum dot can be substantially increased by subjecting the
electron to suitable dynamical decoupling sequences. We analyze the performance
of high-level decoupling protocols by using a combination of analytical and
exact numerical methods, and by paying special attention to the regimes of
large inter-pulse delays and long-time dynamics, which are outside the reach of
standard average Hamiltonian theory descriptions. We demonstrate that dynamical
decoupling can remain efficient far beyond its formal domain of applicability,
and find that a protocol exploiting concatenated design provides best
performance for this system in the relevant parameter range. In situations
where the initial electron state is known, protocols able to completely freeze
decoherence at long times are constructed and characterized. The impact of
system and control non-idealities is also assessed, including the effect of
intra-bath dipolar interaction, magnetic field bias and bath polarization, as
well as systematic pulse imperfections. While small bias field and small bath
polarization degrade the decoupling fidelity, enhanced performance and temporal
modulation result from strong applied fields and high polarizations. Overall,
we find that if the relative errors of the control parameters do not exceed 5%,
decoupling protocols can still prolong the coherence time by up to two orders
of magnitude.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:21:45 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Zhang",
"Wenxian",
""
],
[
"Konstantinidis",
"N. P.",
""
],
[
"Dobrovitski",
"V. V.",
""
],
[
"Harmon",
"B. N.",
""
],
[
"Santos",
"Lea F.",
""
],
[
"Viola",
"Lorenza",
""
]
] | [
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] |
801.0993 | Elsen Veli Veliev | Elsen Veli Veliev and Takhmassib M. Aliev | Wilson Coefficients in the Operator Product Expansion of Scalar Currents
at Finite Temperature | 4 pages, Talk at the International Conference on Hadron Physics
TROIA'07, 30 Aug. - 3 Sept. 2007, Canakkale, Turkey | null | null | null | hep-ph | null | In this paper, we investigate operator product expansion for thermal
correlation function of the two scalar currents. Due to breakdown of Lorentz
invariance at finite temperature, more operators of the same dimension appear
in the operator product expansion than at zero temperature. We calculated
Wilson coefficients in the short distance expansion and obtain operator product
expansion for thermal correlation function in terms of quark condensate, gluon
condensate, quark energy density and gluon energy density.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:23:10 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 08:27:17 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Jan 2008 14:47:25 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Veliev",
"Elsen Veli",
""
],
[
"Aliev",
"Takhmassib M.",
""
]
] | [
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] |
801.0994 | Joshua Stoker | P.F. Mantica, R. Broda, H.L. Crawford, A. Damaske, B. Fornal, A.A.
Hecht, C. Hoffman, M. Horoi, N. Hoteling, R.V.F. Janssens, J. Pereira, J.S.
Pinter, J.B. Stoker, S.L. Tabor, T. Sumikama, W.B. Walters, X. Wang, and S.
Zhu | Beta decay of Neutron-Rich 53-56Ca | 11 figures | Phys.Rev.C77:014313,2008 | 10.1103/PhysRevC.77.014313 | null | nucl-ex | null | Beta-decay properties of neutron-rich Ca isotopes have been obtained.
Half-life values were determined for the first time for 54Ca [86(7) ms], 55Ca
[22(2) ms], and 56Ca [11(2) ms]. The half-life of 230(6) ms deduced for 53Ca is
significantly longer than reported previously, where the decay chain 53K ->
53Ca -> 53Sc was considered. A delayed gamma ray with energy 247 keV as
identified following beta decay of 54Ca, and is proposed to depopulate the
first 1+ level in 54Sc. The beta-decay properties compare favorably with the
results of shell model calculations completed in the full pf-space with the
GXPF1 interaction. The half-lives of the neutron-rich Ca isotopes are also
compared with gross beta-decay theory. The systematic trend of the neutron-rich
Ca half-lives is consistent with the presence of a subshell gap at N=32.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:29:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mantica",
"P. F.",
""
],
[
"Broda",
"R.",
""
],
[
"Crawford",
"H. L.",
""
],
[
"Damaske",
"A.",
""
],
[
"Fornal",
"B.",
""
],
[
"Hecht",
"A. A.",
""
],
[
"Hoffman",
"C.",
""
],
[
"Horoi",
"M.",
""
],
[
"Hoteling",
"N.",
""
],
[
"Janssens",
"R. V. F.",
""
],
[
"Pereira",
"J.",
""
],
[
"Pinter",
"J. S.",
""
],
[
"Stoker",
"J. B.",
""
],
[
"Tabor",
"S. L.",
""
],
[
"Sumikama",
"T.",
""
],
[
"Walters",
"W. B.",
""
],
[
"Wang",
"X.",
""
],
[
"Zhu",
"S.",
""
]
] | [
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] |
801.0995 | J. S. Kaastra | A.M. Bykov, K. Dolag, F. Durret | Cosmological shock waves | 24 pages, 9 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 7; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9312-9 | null | astro-ph | null | Large-scale structure formation, accretion and merging processes, AGN
activity produce cosmological gas shocks. The shocks convert a fraction of the
energy of gravitationally accelerated flows to internal energy of the gas.
Being the main gas-heating agent, cosmological shocks could amplify magnetic
fields and accelerate energetic particles via the multi-fluid plasma relaxation
processes. We first discuss the basic properties of standard single-fluid
shocks. Cosmological plasma shocks are expected to be collisionless. We then
review the plasma processes responsible for the microscopic structure of
collisionless shocks. A tiny fraction of the particles crossing the shock is
injected into the non-thermal energetic component that could get a substantial
part of the ram pressure power dissipated at the shock. The energetic particles
penetrate deep into the shock upstream producing an extended shock precursor.
Scaling relations for postshock ion temperature and entropy as functions of
shock velocity in strong collisionless multi-fluid shocks are discussed. We
show that the multi-fluid nature of collisionless shocks results in excessive
gas compression, energetic particle acceleration, precursor gas heating,
magnetic field amplification and non-thermal emission. Multi-fluid shocks
provide a reduced gas entropy production and could also modify the observable
thermodynamic scaling relations for clusters of galaxies.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:43:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bykov",
"A. M.",
""
],
[
"Dolag",
"K.",
""
],
[
"Durret",
"F.",
""
]
] | [
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] |
801.0996 | Nawaf Bou-Rabee | Nawaf Bou-Rabee and Jerrold E. Marsden | Hamilton-Pontryagin Integrators on Lie Groups: Introduction and
Structure-Preserving Properties | 26 pages, 4 figures | null | null | null | math.NA | null | In this paper structure-preserving time-integrators for rigid body-type
mechanical systems are derived from a discrete Hamilton-Pontryagin variational
principle. From this principle one can derive a novel class of variational
partitioned Runge-Kutta methods on Lie groups. Included among these integrators
are generalizations of symplectic Euler and St\"{o}rmer-Verlet integrators from
flat spaces to Lie groups. Because of their variational design, these
integrators preserve a discrete momentum map (in the presence of symmetry) and
a symplectic form.
In a companion paper, we perform a numerical analysis of these methods and
report on numerical experiments on the rigid body and chaotic dynamics of an
underwater vehicle. The numerics reveal that these variational integrators
possess structure-preserving properties that methods designed to preserve
momentum (using the coadjoint action of the Lie group) and energy (for example,
by projection) lack.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 05:54:58 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Bou-Rabee",
"Nawaf",
""
],
[
"Marsden",
"Jerrold E.",
""
]
] | [
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] |
801.0997 | EDA Publishing Association | H. Chen, L. Hsu, X. Wei | A Novel VLSI Technology to Manufacture High-Density Thermoelectric
Cooling Devices | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | This paper describes a novel integrated circuit technology to manufacture
high-density thermoelectric devices on a semiconductor wafer. With no moving
parts, a thermoelectric cooler operates quietly, allows cooling below ambient
temperature, and may be used for temperature control or heating if the
direction of current flow is reversed. By using a monolithic process to
increase the number of thermoelectric couples, the proposed solid-state cooling
technology can be combined with traditional air cooling, liquid cooling, and
phase-change cooling to yield greater heat flux and provide better cooling
capability.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:34:23 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Chen",
"H.",
""
],
[
"Hsu",
"L.",
""
],
[
"Wei",
"X.",
""
]
] | [
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] |
801.0998 | Hiroyuki Abe | Hiroyuki Abe, Tetsutaro Higaki, Tatsuo Kobayashi, Yuji Omura | Dynamically sequestered F-term uplifting in extra dimension | 22 pages, no figure | JHEP 0804:072,2008 | 10.1088/1126-6708/2008/04/072 | YITP-07-98, TU-787, KUNS-2118 | hep-th hep-ph | null | We study concretely several issues altogether, moduli stabilization, the
dynamical supersymmetry (SUSY) breaking, the uplifting of SUSY anti-de Sitter
(AdS) vacuum and the sequestering of hidden sector, in a simple supergravity
model with a single extra dimension. The sequestering is achieved dynamically
by a wavefunction localization in extra dimension. The expressions for the
visible sector soft SUSY breaking terms as well as the hidden sector potential
are shown explicitly in our model. We find that the tree-level soft scalar mass
and the A-term can be suppressed at a SUSY breaking Minkowski minimum where the
radius modulus is stabilized, while gaugino masses would be a mirage type.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:41:44 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Abe",
"Hiroyuki",
""
],
[
"Higaki",
"Tetsutaro",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Omura",
"Yuji",
""
]
] | [
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801.0999 | EDA Publishing Association | H.S. Park | Dependency of Heat Transfer Rate on the Brinkman Number in Microchannels | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | Heat generation from electronics increases with the advent of high-density
integrated circuit technology. To come up with the heat generation, microscale
cooling has been thought as a promising technology. Prediction of heat transfer
rate is crucial in design of microscale cooling device but is not clearly
understood yet. This work proposes a new correlation between heat transfer rate
and Brinkman number which is nondimensional number of viscosity, flow velocity
and temperature. It is expected that the equation proposed by this work can be
useful to design microchannel cooling device.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:35:13 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Park",
"H. S.",
""
]
] | [
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] |
801.1 | David Weld | D. M. Weld, J. Xia, B. Cabrera, A. Kapitulnik | A New Apparatus for Detecting Micron-Scale Deviations from Newtonian
Gravity | 20 pages, 24 figures. Added references, edited discussion for clarity | Phys.Rev.D77:062006,2008 | 10.1103/PhysRevD.77.062006 | null | gr-qc cond-mat.other hep-ph | null | We describe the design and construction of a new apparatus for detecting or
constraining deviations from Newtonian gravity at short length scales. The
apparatus consists of a new type of probe with rotary mass actuation and
cantilever-based force detection which is used to directly measure the force
between two micromachined masses separated by tens of microns. We present the
first data from the experiment, and discuss the prospects of more precisely
constraining or detecting non-Newtonian effects using this probe. Currently,
the sensitivity to attractive mass-dependent forces is equal to the best
existing limits at length scales near 5 microns. No non-Newtonian effects are
detected at that level.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:37:07 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 00:03:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Weld",
"D. M.",
""
],
[
"Xia",
"J.",
""
],
[
"Cabrera",
"B.",
""
],
[
"Kapitulnik",
"A.",
""
]
] | [
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801.1001 | EDA Publishing Association | C.K. Lee, A.J. Robinson, C.Y. Ching | Development of EHD Ion-Drag Micropump for Microscale Electronics Cooling
Systems | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | In this investigation, the numerical simulation of electrohydrodynamic (EHD)
ion-drag micropumps with micropillar electrode geometries have been performed.
The effect of micropillar height and electrode spacing on the performance of
the micropumps was investigated. The performance of the EHD micropump improved
with increased applied voltage and decreased electrode spacing. The optimum
micropillar height for the micropump with electrode spacing of 40$\mu$m and
channel height of 100$\mu$m at 200V was 40$\mu$m, where a maximum mass flow
rate of 0.18g/min was predicted. Compared to that of planar electrodes, the 3D
micropillar electrode geometry enhanced the overall performance of the EHD
micropumps.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:38:52 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Lee",
"C. K.",
""
],
[
"Robinson",
"A. J.",
""
],
[
"Ching",
"C. Y.",
""
]
] | [
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] |
801.1002 | Ulrich Schuster | Ulrich G. Schuster and Giuseppe Durisi and Helmut B\"olcskei and H.
Vincent Poor | Capacity Bounds for Peak-Constrained Multiantenna Wideband Channels | Submitted to the IEEE Transactions on Communications | null | null | null | cs.IT math.IT | null | We derive bounds on the noncoherent capacity of a very general class of
multiple-input multiple-output channels that allow for selectivity in time and
frequency as well as for spatial correlation. The bounds apply to
peak-constrained inputs; they are explicit in the channel's scattering
function, are useful for a large range of bandwidth, and allow to coarsely
identify the capacity-optimal combination of bandwidth and number of transmit
antennas. Furthermore, we obtain a closed-form expression for the first-order
Taylor series expansion of capacity in the limit of infinite bandwidth. From
this expression, we conclude that in the wideband regime: (i) it is optimal to
use only one transmit antenna when the channel is spatially uncorrelated; (ii)
rank-one statistical beamforming is optimal if the channel is spatially
correlated; and (iii) spatial correlation, be it at the transmitter, the
receiver, or both, is beneficial.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:04:36 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 09:51:58 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Schuster",
"Ulrich G.",
""
],
[
"Durisi",
"Giuseppe",
""
],
[
"Bölcskei",
"Helmut",
""
],
[
"Poor",
"H. Vincent",
""
]
] | [
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] |
801.1003 | EDA Publishing Association | J. Czernohorsky, B. Maj, Matthias Viering, L. Wright, G. Balanon | Evaluation of the impact of solder die attach versus epoxy die attach in
a state of the art power package | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | Subject of this paper is the thermal investigation of epoxy (EDA) and solder
(SDA) die attaches by a comparison of an ASIC with multiple heat sources in
different package assemblies. Static and transient thermal measurements and
simulations were performed to investigate the thermal behavior of two samples
in a state of the art QFP power package differing only in the die attach
material (EDA and SDA).
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:42:26 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Czernohorsky",
"J.",
""
],
[
"Maj",
"B.",
""
],
[
"Viering",
"Matthias",
""
],
[
"Wright",
"L.",
""
],
[
"Balanon",
"G.",
""
]
] | [
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] |
801.1004 | EDA Publishing Association | Satoshi Kondo, Qiang Yu, T. Shibutani, M. Shiratori | New Reliability Assessment Method for Solder Joints in BGA Package by
Considering the Interaction between Design Factors | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | As the integration and the miniaturization of electronics devices, design
space become narrower and interactions between design factors affect their
reliability. This paper presents a methodology of quantifying the interaction
of each design factor in electronics devices. Thermal fatigue reliability of
BGA assembly was assessed with the consideration of the interaction between
design factors. Sensitivity analysis shows the influence of each design factor
to inelastic strain range of a solder joint characterizing the thermal fatigue
life if no interaction occurs. However, there is the interaction in BGA
assembly since inelastic strain range depends on not only a mismatch in CTE but
also a warpage of components. Clustering can help engineers to clarify the
relation between design factors. The variation in the influence was taken to
quantify the interaction of each design factor. Based on the interaction,
simple evaluating approach of inelastic strain range for the BGA assembly was
also developed. BGA package was simplified into a homogeneous component and
equivalent CTE wascalculated from the warpage of BGA and PCB. The estimated
equation was derived by using the response surface method as a function of
design factors. Based upon these analytical results, design engineers can rate
each factor's effect on reliability and assess the reliability of their basic
design plan at the concept design stage.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:46:22 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Kondo",
"Satoshi",
""
],
[
"Yu",
"Qiang",
""
],
[
"Shibutani",
"T.",
""
],
[
"Shiratori",
"M.",
""
]
] | [
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801.1005 | Jesper Pedersen Mr. | Jesper Pedersen, Christian Flindt, Niels Asger Mortensen, Antti-Pekka
Jauho | Spin qubits in antidot lattices | 9 pages, 9 figures | Phys. Rev. B 77, 045325 (2008). | 10.1103/PhysRevB.77.045325 | null | cond-mat.mes-hall | null | We suggest and study designed defects in an otherwise periodic potential
modulation of a two-dimensional electron gas as an alternative approach to
electron spin based quantum information processing in the solid-state using
conventional gate-defined quantum dots. We calculate the band structure and
density of states for a periodic potential modulation, referred to as an
antidot lattice, and find that localized states appear, when designed defects
are introduced in the lattice. Such defect states may form the building blocks
for quantum computing in a large antidot lattice, allowing for coherent
electron transport between distant defect states in the lattice and tunnel
coupling of neighboring defect states with corresponding electrostatically
controllable exchange coupling between different electron spins.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:46:59 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Pedersen",
"Jesper",
""
],
[
"Flindt",
"Christian",
""
],
[
"Mortensen",
"Niels Asger",
""
],
[
"Jauho",
"Antti-Pekka",
""
]
] | [
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] |
801.1006 | EDA Publishing Association | Virginia Mart\'in H\'eriz, J.-H. Park, T. Kemper, S.-M. Kang, A.
Shakouri | Method of Images for the Fast Calculation of Temperature Distributions
in Packaged VLSI Chips | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | Thermal aware routing and placement algorithms are important in industry.
Currently, there are reasonably fast Green's function based algorithms that
calculate the temperature distribution in a chip made from a stack of different
materials. However, the layers are all assumed to have the same size, thus
neglecting the important fact that the thermal mounts which are placed
underneath the chip can be significantly larger than the chip itself. In an
earlier publication, we showed that the image blurring technique can be used to
calculate quickly temperature distribution in realistic packages. For this
method to be effective, temperature distribution for several point heat sources
at the center and at the corner and edges of the chip should be calculated
using finite element analysis (FEA) or measured. In addition, more accurate
results require correction by a weighting function that will need several FEA
simulations. In this paper, we introduce the method of images that take the
symmetry of the thermal boundary conditions into account. Thus with only "two"
finite element simulations, the steady-state temperature distribution for an
arbitrary complex power dissipation profile in a packaged chip can be
calculated. Several simulation results are presented. It is shown that the
power blurring technique together with the method of images can reproduce the
temperature profile with an error less than 0.5%.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:48:09 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Hériz",
"Virginia Martín",
""
],
[
"Park",
"J. -H.",
""
],
[
"Kemper",
"T.",
""
],
[
"Kang",
"S. -M.",
""
],
[
"Shakouri",
"A.",
""
]
] | [
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] |
801.1007 | EDA Publishing Association | P. Szabo, M. Rencz | Short time die attach characterisation of semiconductor devices | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | Thermal qualification of the die attach of semiconductor devices is a very
important element in the device characterization as the temperature of the chip
is strongly affected by the quality of the die attach. Voids or delaminations
in this layer may cause higher temperature elevation and thus damage or shorter
lifetime. Thermal test of each device in the manufacturing process would be the
best solution for eliminating the devices with wrong die attach layer. In this
paper we will present the short time thermal transient measurement method and
the structure function evaluation through simulations and measurements for die
attach characterization. We will also present a method for eliminating the very
time consuming calibration process. Using the proposed methods even the in-line
testing of LEDs can be accomplished.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:50:22 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Szabo",
"P.",
""
],
[
"Rencz",
"M.",
""
]
] | [
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801.1008 | J. S. Kaastra | A.M. Bykov, F.B.S. Paerels, V. Petrosian | Equilibration processes in the Warm-Hot Intergalactic Medium | 13 pages, 4 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 8; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9309-4 | null | astro-ph | null | The Warm-Hot Intergalactic Medium (WHIM) is thought to contribute about 40-50
% to the baryonic budget at the present evolution stage of the universe. The
observed large scale structure is likely to be due to gravitational growth of
density fluctuations in the post-inflation era. The evolving cosmic web is
governed by non-linear gravitational growth of the initially weak density
fluctuations in the dark energy dominated cosmology. Non-linear structure
formation, accretion and merging processes, star forming and AGN activity
produce gas shocks in the WHIM. Shock waves are converting a fraction of the
gravitation power to thermal and non-thermal emission of baryonic/leptonic
matter. They provide the most likely way to power the luminous matter in the
WHIM. The plasma shocks in the WHIM are expected to be collisionless.
Collisionless shocks produce a highly non-equilibrium state with anisotropic
temperatures and a large differences in ion and electron temperatures. We
discuss the ion and electron heating by the collisionless shocks and then
review the plasma processes responsible for the Coulomb equilibration and
collisional ionisation equilibrium of oxygen ions in the WHIM. MHD-turbulence
produced by the strong collisionless shocks could provide a sizeable
non-thermal contribution to the observed Doppler parameter of the UV line
spectra of the WHIM.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:52:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bykov",
"A. M.",
""
],
[
"Paerels",
"F. B. S.",
""
],
[
"Petrosian",
"V.",
""
]
] | [
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] |
801.1009 | EDA Publishing Association | B. Smith, T. Brunschwiler, B. Michel | Utility of transient testing to characterize thermal interface materials | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | This paper analyzes a transient method for the characterization of
low-resistance thermal interfaces of microelectronic packages. The transient
method can yield additional information about the package not available with
traditional static methods at the cost of greater numerical complexity,
hardware requirements, and sensitivity to noise. While the method is
established for package-level thermal analysis of mounted and assembled parts,
its ability to measure the relatively minor thermal impedance of thin thermal
interface material (TIM) layers has not yet been fully studied. We combine the
transient thermal test with displacement measurements of the bond line
thickness to fully characterize the interface.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:52:57 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Smith",
"B.",
""
],
[
"Brunschwiler",
"T.",
""
],
[
"Michel",
"B.",
""
]
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] |
801.101 | Marcel Ausloos | M. Ausloos and F. Petroni | On World Religion Adherence Distribution Evolution | 16 pages, 4 tables, 14 figures, 27 references; a working paper
extension of M. Ausloos and F. Petroni, Statistical dynamics of religions and
adherents, Europhys. Lett. 77 (2007) 38002 | null | null | null | physics.soc-ph | null | Religious adherence can be considered as a degree of freedom, in a
statistical physics sense, for a human agent belonging to a population. The
distribution, performance and life time of religions can thus be studied having
in mind heterogeneous interacting agent modeling in mind. We present a
comprehensive analysis of 58 so called religion (to be better defined in the
main text) evolutions, as measured through their number of adherents between
1900 and 2000, - data taken from the World Christian Encyclopedia: 40 are
considered to be ''presently growing'' cases, including 11 turn overs in the XX
century; 18 are ''presently decaying'', among which 12 are found to have had a
recent maximum, in the XIX or the XX century. The Avrami-Kolmogorov
differential equation which usually describes solid state transformations, like
crystal growth, is used in each case in order to obtain the preferential
attachment parameter introduced previously. It is often found close to unity,
indicating a smooth evolution. However large values suggest the occurrence of
extreme cases which we conjecture are controlled by so called external fields.
A few cases indicate the likeliness of a detachment process. We discuss
different growing and decaying religions, and illustrate various fits. Some
cases seem to indicate the lack of reliability of the data. Others, departure
from Avrami law. We point out two difficulties in the analysis : (i) the
''precise'' original time of apparition of a religion, (ii) the time of its
maximum, both informations being necessary for integrating reliably any
evolution equation. Moreover the Avrami evolution equation might be surely
improved, in particular, and somewhat obviously, for the decaying religion
cases.
| [
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801.1011 | J. S. Kaastra | J.S. Kaastra, F.B.S. Paerels, F. Durret, S. Schindler, P. Richter | Thermal radiation processes | 37 pages, 16 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 9; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9310-y | null | astro-ph | null | We discuss the different physical processes that are important to understand
the thermal X-ray emission and absorption spectra of the diffuse gas in
clusters of galaxies and the warm-hot intergalactic medium. The ionisation
balance, line and continuum emission and absorption properties are reviewed and
several practical examples are given that illustrate the most important
diagnostic features in the X-ray spectra.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 14:59:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kaastra",
"J. S.",
""
],
[
"Paerels",
"F. B. S.",
""
],
[
"Durret",
"F.",
""
],
[
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"S.",
""
],
[
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801.1012 | George Tsibidis | George D. Tsibidis and Nektarios Tavernarakis | Nemo: a computational tool for analyzing nematode locomotion | 12 pages, 2 figures. accepted by BMC Neuroscience 2007, 8:86 | BMC Neuroscience 2007, 8:86 | null | null | q-bio.OT q-bio.GN q-bio.QM | null | The nematode Caenorhabditis elegans responds to an impressive range of
chemical, mechanical and thermal stimuli and is extensively used to investigate
the molecular mechanisms that mediate chemosensation, mechanotransduction and
thermosensation. The main behavioral output of these responses is manifested as
alterations in animal locomotion. Monitoring and examination of such
alterations requires tools to capture and quantify features of nematode
movement. In this paper, we introduce Nemo (nematode movement), a
computationally efficient and robust two-dimensional object tracking algorithm
for automated detection and analysis of C. elegans locomotion. This algorithm
enables precise measurement and feature extraction of nematode movement
components. In addition, we develop a Graphical User Interface designed to
facilitate processing and interpretation of movement data. While, in this
study, we focus on the simple sinusoidal locomotion of C. elegans, our approach
can be readily adapted to handle complicated locomotory behaviour patterns by
including additional movement characteristics and parameters subject to
quantification. Our software tool offers the capacity to extract, analyze and
measure nematode locomotion features by processing simple video files. By
allowing precise and quantitative assessment of behavioral traits, this tool
will assist the genetic dissection and elucidation of the molecular mechanisms
underlying specific behavioral responses.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:00:52 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Tsibidis",
"George D.",
""
],
[
"Tavernarakis",
"Nektarios",
""
]
] | [
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801.1013 | Stephen Jewson | Timothy Hall and Stephen Jewson | SST and North American Tropical Cyclone Landfall: A Statistical Modeling
Study | null | null | null | null | physics.ao-ph | null | We employ a statistical model of North Atlantic tropical cyclone (TC) tracks
to investigate the relationship between sea-surface temperature (SST) and North
American TC landfall rates. The track model is conditioned on summer SST in the
tropical North Atlantic being in either the 19 hottest or the 19 coldest years
in the period 1950-2005. For each conditioning many synthetic TCs are generated
and landfall rates computed. Compared to direct analysis of historical
landfall, the track model reduces the sampling error by projecting information
from the entire basin onto the coast. There are 46% more TCs in hot years than
cold in the model, which is highly significant compared to random sampling and
corroborates well documented trends in North Atlantic TC number in recent
decades. In the absence of other effects, this difference results in a
significant increase in model landfall rates in hot years, uniform along the
coast. Hot-cold differences in the geographic distribution of genesis and in TC
propagation do not significantly alter the overall landfall-rate difference in
the model, and the net landfall rate is 1/4.7 yr in hot years and 1/3.1 yr in
cold years. SST influence on genesis site and propagation does modify the
geographic distribution of landfall, however. The Yucatan suffers 3 times
greater landfall rate in hot years than cold, while the U.S. mid-Atlantic coast
exhibits no significant change. Landfall probabilities increase in hot years
compared to all years in Florida, the U.S Gulf coast, the Mexican Gulf coast,
and Yucatan with at least 95% confidence.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:01:36 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Hall",
"Timothy",
""
],
[
"Jewson",
"Stephen",
""
]
] | [
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] |
801.1014 | Cornelis Jacominus Van Der Beek | Panayotis Spathis (LSI), Sylvain Colson (LSI), Feng Yang (LSI),
Cornelis Jacominus Van Der Beek (LSI), Piotr Gierlowski (IFPAN), Takasada
Shibauchi, Yuji Matsuda, Marat Gaifullin (NIMS), Ming Li (KOL), Peter H. Kes
(KOL) | Nature of c-axis coupling in underdoped Bi2Sr2CaCu2O8 with varying
degrees of disorder | 10 pages, 9 Figures | null | 10.1103/PhysRevB.77.104503 | null | cond-mat.supr-con | null | The dependence of the Josephson Plasma Resonance (JPR) frequency in heavily
underdoped Bi2Sr2CaCu2O8+\delta on temperature and controlled pointlike
disorder, introduced by high-energy electron irradiation, is cross-correlated
and compared to the behavior of the ab-plane penetration depth. It is found
that the zero temperature plasma frequency, representative of the superfluid
component of the c-axis spectral weight, decreases proportionally with T_c when
the disorder is increased. The temperature dependence of the JPR frequency is
the same for all disorder levels, including pristine crystals. The reduction of
the c-axis superfluid density as function of disorder is accounted for by
pair-breaking induced by impurity scattering in the CuO2 planes, rather than by
quantum fluctuations of the superconducting phase. The reduction of the c-axis
superfluid density as function of temperature follows a T^{2}--law and is
accounted for by quasi-particle hopping through impurity induced interlayer
states.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:04:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Spathis",
"Panayotis",
"",
"LSI"
],
[
"Colson",
"Sylvain",
"",
"LSI"
],
[
"Yang",
"Feng",
"",
"LSI"
],
[
"Van Der Beek",
"Cornelis Jacominus",
"",
"LSI"
],
[
"Gierlowski",
"Piotr",
"",
"IFPAN"
],
[
"Shibauchi",
"Takasada",
"",
"NIMS"
],
[
"Matsuda",
"Yuji",
"",
"NIMS"
],
[
"Gaifullin",
"Marat",
"",
"NIMS"
],
[
"Li",
"Ming",
"",
"KOL"
],
[
"Kes",
"Peter H.",
"",
"KOL"
]
] | [
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] |
801.1015 | Tomi Paananen | T. Paananen, T. K. Koponen, P. Torma, and J. -P. Martikainen | Noise correlations of the ultra-cold Fermi gas in an optical lattice | 25 pages, 11 figures. Some figures are updated and text has been
modified | Phys. Rev. A 77, 053602 (2008) | 10.1103/PhysRevA.77.053602 | null | cond-mat.other | null | In this paper we study the density noise correlations of the two component
Fermi gas in optical lattices. Three different type of phases, the BCS-state
(Bardeen, Cooper, and Schieffer), the FFLO-state (Fulde, Ferrel, Larkin, and
Ovchinnikov), and BP (breach pair) state, are considered. We show how these
states differ in their noise correlations. The noise correlations are
calculated not only at zero temperature, but also at non-zero temperatures
paying particular attention to how much the finite temperature effects might
complicate the detection of different phases. Since one-dimensional systems
have been shown to be very promising candidates to observe FFLO states, we
apply our results also to the computation of correlation signals in a
one-dimensional lattice. We find that the density noise correlations reveal
important information about the structure of the underlying order parameter as
well as about the quasiparticle dispersions.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:08:40 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 09:20:31 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Apr 2008 05:22:56 GMT"
}
] | 2008-05-08T00:00:00 | [
[
"Paananen",
"T.",
""
],
[
"Koponen",
"T. K.",
""
],
[
"Torma",
"P.",
""
],
[
"Martikainen",
"J. -P.",
""
]
] | [
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] |
801.1016 | J. S. Kaastra | V. Petrosian, Y. Rephaeli, A. Bykov | Nonthermal radiation mechanisms | 17 pages, 6 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 10; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9327-2 | null | astro-ph | null | In this paper we review the possible radiation mechanisms for the observed
non-thermal emission in clusters of galaxies, with a primary focus on the radio
and hard X-ray emission. We show that the difficulty with the non-thermal,
non-relativistic Bremsstrahlung model for the hard X-ray emission, first
pointed out by Petrosian (2001) using a cold target approximation, is somewhat
alleviated when one treats the problem more exactly by including the fact that
the background plasma particle energies are on average a factor of 10 below the
energy of the non-thermal particles. This increases the lifetime of the
non-thermal particles, and as a result decreases the extreme energy
requirement, but at most by a factor of three. We then review the synchrotron
and so-called inverse Compton emission by relativistic electrons, which when
compared with observations can constrain the value of the magnetic field and
energy of relativistic electrons. This model requires a low value of the
magnetic field which is far from the equipartition value. We briefly review the
possibilities of gamma-ray emission and prospects for GLAST observations. We
also present a toy model of the non-thermal electron spectra that are produced
by the acceleration mechanisms discussed in an accompanying paper.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:06:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Petrosian",
"V.",
""
],
[
"Rephaeli",
"Y.",
""
],
[
"Bykov",
"A.",
""
]
] | [
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] |
801.1017 | Bernhard W. Keil | Ahmad Hujeirat, Max Camenzind and Bernhard W. Keil (ZAH,
Landessternwarte K\"onigstuhl (LSW), Universit\"at Heidelberg) | An implicit numerical algorithm for solving the general relativistic
hydrodynamical equations around accreting compact objects | 30 pages, 8 figures, to be published in New Astronomy | New Astron.13:436-450,2008 | 10.1016/j.newast.2007.12.004 | null | astro-ph | null | An implicit algorithm for solving the equations of general relativistic
hydrodynamics in conservative form in three-dimensional axi-symmetry is
presented. This algorithm is a direct extension of the pseudo-Newtonian
implicit radiative magnetohydrodynamical solver -IRMHD- into the general
relativistic regime.
We adopt the Boyer-Lindquist coordinates and formulate the hydrodynamical
equations in the fixed background of a Kerr black hole. The set of equations
are solved implicitly using the hierarchical solution scenario (HSS). The HSS
is efficient, robust and enables the use of a variety of solution procedures
that range from a purely explicit up to fully implicit schemes. The
discretization of the HD-equations is based on the finite volume formulation
and the defect-correction iteration strategy for recovering higher order
spatial and temporal accuracies. Depending on the astrophysical problem, a
variety of relaxation methods can be applied. In particular the vectorized
black-white Line-Gauss-Seidel relaxation method is most suitable for modeling
accretion flows with shocks, whereas the Approximate Factorization Method is
for weakly compressible flows.
The results of several test calculations that verify the accuracy and
robustness of the algorithm are shown. Extending the algorithm to enable
solving the non-ideal MHD equations in the general relativistic regime is the
subject of our ongoing research.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:10:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hujeirat",
"Ahmad",
"",
"ZAH,\n Landessternwarte Königstuhl"
],
[
"Camenzind",
"Max",
"",
"ZAH,\n Landessternwarte Königstuhl"
],
[
"Keil",
"Bernhard W.",
"",
"ZAH,\n Landessternwarte Königstuhl"
]
] | [
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] |
801.1018 | Cyril Georgy | Andr\'e Maeder, Cyril Georgy, Georges Meynet | Convective envelopes in rotating OB stars | 4 pages, 3 figures, accepted by Astronomy and Astrophysics | A&A 479, 37, 2008 | 10.1051/0004-6361:20079007 | null | astro-ph | null | We study the effects of rotation on the outer convective zones of massive
stars. We examine the effects of rotation on the thermal gradient and on the
Solberg--Hoiland term by analytical developments and by numerical models.
Writing the criterion for convection in rotating envelopes, we show that the
effects of rotation on the thermal gradient are much larger and of opposite
sign to the effect of the Solberg-Hoiland criterion. On the whole, rotation
favors convection in stellar envelopes at the equator and to a smaller extent
at the poles. In a rotating 20 Msun star at 94% of the critical angular
velocity, there are two convective envelopes, with the bigger one having a
thickness of 13.2% of the equatorial radius. In the non-rotating model, the
corresponding convective zone has a thickness of only 4.6% of the radius. The
occurrence of outer convection in massive stars has many consequences.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:15:41 GMT"
}
] | 2008-07-31T00:00:00 | [
[
"Maeder",
"André",
""
],
[
"Georgy",
"Cyril",
""
],
[
"Meynet",
"Georges",
""
]
] | [
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] |
801.1019 | Jean-Eric Wegrowe | J.-E. Wegrowe, S. M. Santos, M.-C. Ciornei, H.-J. Drouhin, J. M.
Rub\'i | Magnetization reversal driven by spin-injection : a mesoscopic
spin-transfer effect | 20 pages, 2 figures | null | 10.1103/PhysRevB.77.174408 | null | cond-mat.mes-hall | null | A mesoscopic description of spin-transfer effect is proposed, based on the
spin-injection mechanism occurring at the junction with a ferromagnet. The
effect of spin-injection is to modify locally, in the ferromagnetic
configuration space, the density of magnetic moments. The corresponding
gradient leads to a current-dependent diffusion process of the magnetization.
In order to describe this effect, the dynamics of the magnetization of a
ferromagnetic single domain is reconsidered in the framework of the
thermokinetic theory of mesoscopic systems. Assuming an Onsager
cross-coefficient that couples the currents, it is shown that spin-dependent
electric transport leads to a correction of the Landau-Lifshitz-Gilbert
equation of the ferromagnetic order parameter with supplementary diffusion
terms. The consequence of spin-injection in terms of activation process of the
ferromagnet is deduced, and the expressions of the effective energy barrier and
of the critical current are derived. Magnetic fluctuations are calculated: the
correction to the fluctuations is similar to that predicted for the activation.
These predictions are consistent with the measurements of spin-transfer
obtained in the activation regime and for ferromagnetic resonance under
spin-injection.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:16:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wegrowe",
"J. -E.",
""
],
[
"Santos",
"S. M.",
""
],
[
"Ciornei",
"M. -C.",
""
],
[
"Drouhin",
"H. -J.",
""
],
[
"Rubí",
"J. M.",
""
]
] | [
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] |
801.102 | Thomas Archer | Thomas Archer, Ruairi Hanafin and Stefano Sanvito | Magnetism of CoO polymorphs | null | null | null | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A microscopic explanation for the room temperature ferromagnetism in diluted
ZnO:Co is at present rather elusive. Although standard secondary phases can
usually be ruled out, it is less clear whether regions with high Co
concentration coexist with undoped portions of the film, i.e. whether some form
of CoO polymorph can be responsible for the magnetic signal. Since X-ray
usually excludes the presence of the native rock-salt phase, the study of CoO
polymorphs becomes particularly interesting. In this work we investigate
theoretically the magnetism of CoO in both the wurtzite and zincblende phases.
By using a combination of density functional theory with the LDA+$U$
approximation and Monte Carlo simulations we demonstrate that wurtzite and
zincblende CoO have a complex frustrated anti-ferromagnetic ground state with
no net magnetic moment in the bulk. Most importantly the estimated critical
temperatures are well below room temperature for both cases. This suggests that
bulk CoO polymorphs are not responsible for the room temperature magnetism
observed for ZnO:Co, although the role of clusters with uncompensated spins or
arranged in a spinodal decomposed structure still remains an open question.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:33:58 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 12:58:53 GMT"
}
] | 2008-07-01T00:00:00 | [
[
"Archer",
"Thomas",
""
],
[
"Hanafin",
"Ruairi",
""
],
[
"Sanvito",
"Stefano",
""
]
] | [
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] |
801.1021 | Brihaye Yves | Y. Brihaye, E. Radu | Five-dimensional rotating black holes in Einstein-Gauss-Bonnet theory | 10 pages, 6 figures, references added, minor modifications, typos
corrected | Phys.Lett.B661:167-174,2008 | 10.1016/j.physletb.2008.02.005 | null | hep-th gr-qc | null | We present arguments for the existence of five-dimensional rotating black
holes with equal magnitude angular momenta in Einstein-Gauss-Bonnet theory with
negative cosmological constant. These solutions posses a regular horizon of
spherical topology and approach asymptotically an Anti-de Sitter spacetime
background. We discuss the general properties of these solutions and, using an
adapted counterterm prescription, we compute their entropy and conserved
charges.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:12:30 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 14:59:28 GMT"
},
{
"version": "v3",
"created": "Mon, 3 Mar 2008 16:29:52 GMT"
},
{
"version": "v4",
"created": "Tue, 4 Mar 2008 14:48:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brihaye",
"Y.",
""
],
[
"Radu",
"E.",
""
]
] | [
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] |
801.1022 | George Tsibidis | Nigel J. Burroughs, George D. Tsibidis, William Gaze and Liz
Wellington | Study Of Spatial Biological Systems Using a Graphical User Interface | null | Proceedings of the Tenth International Conference on
Human-Computer Interaction 2003, pp. 48-52 | null | null | q-bio.QM q-bio.OT | null | In this paper, we describe a Graphical User Interface (GUI) designed to
manage large quantities of image data of a biological system. After setting the
design requirements for the system, we developed an ecology quantification GUI
that assists biologists in analysing data. We focus on the main features of the
interface and we present the results and an evaluation of the system. Finally,
we provide some directions for some future work.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:34:49 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Burroughs",
"Nigel J.",
""
],
[
"Tsibidis",
"George D.",
""
],
[
"Gaze",
"William",
""
],
[
"Wellington",
"Liz",
""
]
] | [
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] |
801.1023 | J. S. Kaastra | K. Dolag, S. Borgani, S. Schindler, A. Diaferio, A.M. Bykov | Simulation techniques for cosmological simulations | 42 pages, 16 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 12; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9316-5 | null | astro-ph | null | Modern cosmological observations allow us to study in great detail the
evolution and history of the large scale structure hierarchy. The fundamental
problem of accurate constraints on the cosmological parameters, within a given
cosmological model, requires precise modelling of the observed structure. In
this paper we briefly review the current most effective techniques of large
scale structure simulations, emphasising both their advantages and
shortcomings. Starting with basics of the direct N-body simulations appropriate
to modelling cold dark matter evolution, we then discuss the direct-sum
technique GRAPE, particle-mesh (PM) and hybrid methods, combining the PM and
the tree algorithms. Simulations of baryonic matter in the Universe often use
hydrodynamic codes based on both particle methods that discretise mass, and
grid-based methods. We briefly describe Eulerian grid methods, and also some
variants of Lagrangian smoothed particle hydrodynamics (SPH) methods.
| [
{
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"created": "Mon, 7 Jan 2008 15:35:12 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Dolag",
"K.",
""
],
[
"Borgani",
"S.",
""
],
[
"Schindler",
"S.",
""
],
[
"Diaferio",
"A.",
""
],
[
"Bykov",
"A. M.",
""
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801.1024 | Matthew Shepherd | M. R. Shepherd | Hadronic Physics at CLEO-c | 12 pages, 4 figures, to be published in the Proceedings of the 12th
International Conference on Hadron Spectroscopy: HADRON 07, Frascati, October
8-13, 2007 | null | null | null | hep-ex | null | The charmonium system provides an opportunity to explore a wide variety of
topics in hadronic physics. Studies of the properties of and transitions among
cc-bar states yield insight into relativistic and non-perturbative QCD effects.
At the same time, studies of the decays of charmonium states are a window into
gluon dynamics and the role of glueball mixing in the production of light quark
states. A collection of preliminary results utilizing the full CLEO-c psi(2S)
data sample is presented including two-body branching fractions of chi_cJ
decays, a precision measurement of the h_c mass, and results on the hindered M1
transition: psi(2S) -> gamma eta_c.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:35:34 GMT"
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] | 2008-01-08T00:00:00 | [
[
"Shepherd",
"M. R.",
""
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801.1025 | Claudio Cazorla | C. Cazorla and J. Boronat | Atomic kinetic energy, momentum distribution and structure of solid neon
at zero-temperature | 20 pages, 7 figures. To be published in Physical Review B | null | 10.1103/PhysRevB.77.024310 | null | cond-mat.other | null | We report on the calculation of the ground-state atomic kinetic energy,
$E_{k}$, and momentum distribution of solid Ne by means of the diffusion Monte
Carlo method and Aziz HFD-B pair potential. This approach is shown to perform
notably for this crystal since we obtain very good agreement with respect to
experimental thermodynamic data. Additionally, we study the structural
properties of solid Ne at densities near the equilibrium by estimating the
radial pair-distribution function, Lindemann's ratio and atomic density profile
around the positions of the perfect crystalline lattice. Our value for $E_{k}$
at the equilibrium density is $41.51(6)$ K, which agrees perfectly with the
recent prediction made by Timms {\it et al.}, $41(2)$ K, based on their
deep-inelastic neutron scattering experiments carried out over the temperature
range $4 - 20$ K, and also with previous path integral Monte Carlo results
obtained with the Lennard-Jones and Aziz HFD-C2 atomic pairwise interactions.
The one-body density function of solid Ne is calculated accurately and found to
fit perfectly, within statistical uncertainty, to a Gaussian curve.
Furthermore, we analyze the degree of anharmonicity of solid Ne by calculating
some of its microscopic ground-state properties within traditional harmonic
approaches. We provide insightful comparison to solid $^4$He in terms of the
Debye model, in order to size the relevance of anharmonic effects in Ne.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:37:02 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Cazorla",
"C.",
""
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"J.",
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] |
801.1026 | Vincent Colin | Vincent Colin (LMJL), Sebastiao Firmo | Paires de structures de contact sur les vari\'et\'es de dimension trois | 21 pages, we correct several mistakes of v1 | Algebr. Geom. Topol. 11 (2011) 2627-2653 | 10.2140/agt.2011.11.2627 | null | math.SG math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a notion of positive pair of contact structures on a 3-manifold
which generalizes a previous definition of Eliashberg-Thurston and Mitsumatsu.
Such a pair gives rise to a locally integrable plane field $\lambda$. We prove
that if $\lambda$ is uniquely integrable and if both structures of the pair are
tight, then the integral foliation of $\lambda$ doesn't contain any Reeb
component whose core curve is homologous to zero. Moreover, the ambient
manifold carries a Reebless foliation. We also show a stability theorem "\`a la
Reeb" for positive pairs of tight contact structures.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:49:49 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Oct 2008 14:34:03 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Colin",
"Vincent",
"",
"LMJL"
],
[
"Firmo",
"Sebastiao",
""
]
] | [
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801.1027 | Renaud Leplaideur | Renaud Leplaideur (LM), Krerley Oliveira, Isabel Rios | Equilibrium States for Partially Hyperbolic Horseshoes | null | null | null | null | math.DS | null | In this paper, we study ergodic features of invariant measures for the
partially hyperbolic horseshoe at the boundary of uniformly hyperbolic
diffeomorphisms constructed in \cite{DHRS07}. Despite the fact that the
non-wandering set is a horseshoe, it contains intervals. We prove that every
recurrent point has non-zero Lyapunov exponents and all ergodic invariant
measures are hyperbolic. As a consequence, we obtain the existence of
equilibrium measures for any continuous potential. We also obtain an example of
a family of $C^\infty$ potentials with phase transition.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:52:12 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Leplaideur",
"Renaud",
"",
"LM"
],
[
"Oliveira",
"Krerley",
""
],
[
"Rios",
"Isabel",
""
]
] | [
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] |
801.1028 | Emmanuel Lipmanov | E. M. Lipmanov | United Quark and Neutrino Mixing Matrices with Universal Pair of
CP-Violating Phases | 21 pages; comments, acknowledgments and references added | null | null | null | hep-ph | null | The Standard Model quark and neutrino mixing matrices are of independent
empirical origin, but they do suggest unification. In this paper I obtained two
united one-parameter quark and neutrino mixing matrices inferred from two
semi-empirical deviation-from-mass-degeneracy (DMD) flavor rules (quadratic
DMD-hierarchy rule and Dirac-Majorana DMD-duality rule) without use of the
common exact-flavor-symmetry suggestions for that particular unification
problem. One small empirical parameter quantitatively defines the pattern of
particle flavor physics. The main predictions are: 1) hierarchical connections
between the 2 large solar and atmospheric neutrino mixing angels, and the 2
small quark mixing angels, 2) universal sequence of 14 equality relations to
that one-empirical-parameter of the quark and neutrino mixing-matrix
parameters, CP-phases and lepton mass ratios, which are free dimensionless
constants in the Standard Model, 3) complementarity connections between doubled
large neutrino and small quark mixing angles, 4) tentative solution of the
CP-violation problem in framework of Standard Model mixing matrix phenomenology
by suggesting a universal set of two nonzero values ~58.8 and ~31.2 degrees for
Dirac and Majorana CP-violating phases.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 20:02:53 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jan 2008 20:16:53 GMT"
}
] | 2009-03-11T00:00:00 | [
[
"Lipmanov",
"E. M.",
""
]
] | [
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801.1029 | EDA Publishing Association | Wladyslaw Szczesniak | Reducing Average and Peak Temperatures of VLSI CMOS Digital Circuits by
Means of Heuristic Scheduling Algorithm | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | This paper presents a BPD (Balanced Power Dissipation) heuristic scheduling
algorithm applied to VLSI CMOS digital circuits/systems in order to reduce the
global computational demand and provide balanced power dissipation of
computational units of the designed digital VLSI CMOS system during the task
assignment stage. It results in reduction of the average and peak temperatures
of VLSI CMOS digital circuits. The elaborated algorithm is based on balanced
power dissipation of local computational (processing) units and does not
deteriorate the throughput of the whole VLSI CMOS digital system.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:54:42 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Szczesniak",
"Wladyslaw",
""
]
] | [
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801.103 | EDA Publishing Association | Z. Szucs, G. Nagy, S. Hodossy, M. Rencz, A. Poppe | Vibration Combined High Temperature Cycle Tests for Capacitive MEMS
Accelerometers | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | In this paper vibration combined high temperature cycle tests for packaged
capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to
provide useful Design for Reliability information for MEMS designers. A high
temperature test chamber and a chopper-stabilized read-out circuitry were
designed and realized at BME - DED. Twenty thermal cycles of combined
Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5
samples. Statistical evaluation of the test results showed that degradation has
started in 3 out of the 5 samples.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 15:56:46 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Szucs",
"Z.",
""
],
[
"Nagy",
"G.",
""
],
[
"Hodossy",
"S.",
""
],
[
"Rencz",
"M.",
""
],
[
"Poppe",
"A.",
""
]
] | [
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801.1031 | Alessandro Patruno | Alessandro Patruno (API, Univ. Amsterdam), Diego Altamirano (API,
Univ. Amsterdam), Jason W.T. Hessels (API, Univ. Amsterdam), Piergiorgio
Casella (API, Univ. Amsterdam), Rudy Wijnands (API, Univ. Amsterdam), Michiel
van der Klis (API, Univ. Amsterdam) | Phase-coherent timing of the accreting millisecond pulsar SAX
J1748.9-2021 | 22 pages, 7 figures, ApJ accepted. Two figures removed, one typo in
the Timing parameters corrected (Table 2) | Astrophys.J.690:1856-1865,2009 | 10.1088/0004-637X/690/2/1856 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a phase-coherent timing analysis of the intermittent accreting
millisecond pulsar SAX J1748.9-2021. A new timing solution for the pulsar spin
period and the Keplerian binary orbital parameters was achieved by phase
connecting all episodes of intermittent pulsations visible during the 2001
outburst. We investigate the pulse profile shapes, their energy dependence and
the possible influence of Type I X-ray bursts on the time of arrival and
fractional amplitude of the pulsations. We find that the timing solution of SAX
J1748.9-2021 shows an erratic behavior when selecting different subsets of
data, that is related to substantial timing noise in the timing post-fit
residuals. The pulse profiles are very sinusoidal and their fractional
amplitude increases linearly with energy and no second harmonic is detected.
The reason why this pulsar is intermittent is still unknown but we can rule out
a one-to-one correspondence between Type I X-ray bursts and the appearance of
the pulsations.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:37:34 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Sep 2008 14:50:33 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Patruno",
"Alessandro",
"",
"API, Univ. Amsterdam"
],
[
"Altamirano",
"Diego",
"",
"API,\n Univ. Amsterdam"
],
[
"Hessels",
"Jason W. T.",
"",
"API, Univ. Amsterdam"
],
[
"Casella",
"Piergiorgio",
"",
"API, Univ. Amsterdam"
],
[
"Wijnands",
"Rudy",
"",
"API, Univ. Amsterdam"
],
[
"van der Klis",
"Michiel",
"",
"API, Univ. Amsterdam"
]
] | [
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] |
801.1032 | J. S. Kaastra | S. Borgani, A. Diaferio, K. Dolag, S. Schindler | Thermodynamical properties of the ICM from hydrodynamical simulations | 26 pages, 12 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 13; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9317-4 | null | astro-ph | null | Modern hydrodynamical simulations offer nowadays a powerful means to trace
the evolution of the X-ray properties of the intra-cluster medium (ICM) during
the cosmological history of the hierarchical build up of galaxy clusters. In
this paper we review the current status of these simulations and how their
predictions fare in reproducing the most recent X-ray observations of clusters.
After briefly discussing the shortcomings of the self-similar model, based on
assuming that gravity only drives the evolution of the ICM, we discuss how the
processes of gas cooling and non-gravitational heating are expected to bring
model predictions into better agreement with observational data. We then
present results from the hydrodynamical simulations, performed by different
groups, and how they compare with observational data. As terms of comparison,
we use X-ray scaling relations between mass, luminosity, temperature and
pressure, as well as the profiles of temperature and entropy. The results of
this comparison can be summarised as follows: (a) simulations, which include
gas cooling, star formation and supernova feedback, are generally successful in
reproducing the X-ray properties of the ICM outside the core regions; (b)
simulations generally fail in reproducing the observed ``cool core'' structure,
in that they have serious difficulties in regulating overcooling, thereby
producing steep negative central temperature profiles. This discrepancy calls
for the need of introducing other physical processes, such as energy feedback
from active galactic nuclei, which should compensate the radiative losses of
the gas with high density, low entropy and short cooling time, which is
observed to reside in the innermost regions of galaxy clusters.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:05:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Borgani",
"S.",
""
],
[
"Diaferio",
"A.",
""
],
[
"Dolag",
"K.",
""
],
[
"Schindler",
"S.",
""
]
] | [
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801.1033 | George Tsibidis | George Tsibidis, Theodoros N. Arvanitis and Chris Baber | The What, Who, Where, When, Why and How of Context-Awareness | Accepted manuscript at the CHI 2000, April 3-2000, The Hague, The
Netherlands | null | null | null | cs.HC | null | The understanding of context and context-awareness is very important for the
areas of handheld and ubiquitous computing. Unfortunately, at present, there
has not been a satisfactory definition of these two concepts that would lead to
a more effective communication in humancomputer interaction. As a result, on
the one hand, application designers are not able to choose what context to use
in their applications and on the other, they cannot determine the type of
context-awareness behaviours their applications should exhibit. In this work,
we aim to provide answers to some fundamental questions that could enlighten us
on the definition of context and its functionality.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:05:46 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Tsibidis",
"George",
""
],
[
"Arvanitis",
"Theodoros N.",
""
],
[
"Baber",
"Chris",
""
]
] | [
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] |
801.1034 | Rob Beswick | R. J. Beswick, T. W. B. Muxlow, H. Thrall, A. M. S. Richards, S. T.
Garrington (Jodrell Bank Centre for Astrophysics, The University of
Manchester) | An evolution of the IR-Radio correlation? | To Appear in The Modern Radio Universe: From Planets to Dark Energy
Conference (Oct 1-5 2007, The University of Manchester) Editors: Beswick,
Diamond & Schilizzi | PoS MRU:056,2007 | null | null | astro-ph | null | Using extremely deep (rms 3.3 microJy/bm) 1.4GHz sub-arcsecond resolution
MERLIN + VLA radio observations of a 8'.5 by 8'.5 field centred upon the Hubble
Deep Field North, in conjunction with Spitzer 24 micron data we present an
investigation of the radio-MIR correlation at very low flux densities. By
stacking individual sources within these data we are able to extend the
MIR-radio correlation to the extremely faint (~microJy and even sub-microJy)
radio source population. Tentatively we demonstrate a small deviation from the
correlation for the faintest MIR sources. We suggest that this small observed
change in the gradient of the correlation is the result of a suppression of the
MIR emission in faint star-forming galaxies. This deviation potentially has
significant implications for using either the MIR or non-thermal radio emission
as a star-formation tracer at low luminosities.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 18:07:15 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Beswick",
"R. J.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Muxlow",
"T. W. B.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Thrall",
"H.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Richards",
"A. M. S.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Garrington",
"S. T.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
]
] | [
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801.1035 | Rob Beswick | R. J. Beswick, T. W. B. Muxlow, H. Thrall, A. M. S. Richards, S. T.
Garrington (Jodrell Bank Centre for Astrophysics, The University of
Manchester) | An evolution of the IR-Radio correlation at very low flux densities? | Accepted for publication in MNRAS, 14 pages, 9 Figures (7 colour), 2
tables | null | 10.1111/j.1365-2966.2008.12931.x | null | astro-ph | null | In this paper we investigate the radio-MIR correlation at very low flux
densities using extremely deep 1.4 GHz sub-arcsecond angular resolution
MERLIN+VLA observations of a 8'.5 by 8'.5 field centred upon the Hubble Deep
Field North, in conjunction with Spitzer 24micron data. From these results the
MIR-radio correlation is extended to the very faint (~microJy) radio source
population. Tentatively we detect a small deviation from the correlation at the
faintest IR flux densities. We suggest that this small observed change in the
gradient of the correlation is the result of a suppression of the MIR emission
in faint star-forming galaxies. This deviation potentially has significant
implications for using either the MIR or non-thermal radio emission as a
star-formation tracer of very low luminosity galaxies.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:18:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Beswick",
"R. J.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Muxlow",
"T. W. B.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Thrall",
"H.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Richards",
"A. M. S.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
],
[
"Garrington",
"S. T.",
"",
"Jodrell Bank Centre for Astrophysics, The University of\n Manchester"
]
] | [
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] |
801.1036 | David Orden | Oswin Aichholzer, Jes\'us Garc\'ia, David Orden, Pedro Ramos | New results on lower bounds for the number of (at most k)-facets | 11 pages, 5 figures. Submitted to European Journal of Combinatorics.
Changes: last result in the abstract generalized to $d$ dimensions, Section 4
simplified | European Journal of Combinatorics 30:7 (2009), 1568-1574 | 10.1016/j.ejc.2009.03.010 | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present three different results dealing with the number of
$(\leq k)$-facets of a set of points:
1. We give structural properties of sets in the plane that achieve the
optimal lower bound $3\binom{k+2}{2}$ of $(\leq k)$-edges for a fixed $0\leq
k\leq \lfloor n/3 \rfloor -1$;
2. We give a simple construction showing that the lower bound
$3\binom{k+2}{2}+3\binom{k-\lfloor \frac{n}{3} \rfloor+2}{2}$ for the number of
$(\leq k)$-edges of a planar point set appeared in [Aichholzer et al. New lower
bounds for the number of ($\leq k$)-edges and the rectilinear crossing number
of $K_n$. {\em Disc. Comput. Geom.} 38:1 (2007), 1--14] is optimal in the range
$\lfloor n/3 \rfloor \leq k \leq \lfloor 5n/12 \rfloor -1$;
3. We show that for $k < \lfloor n/(d+1) \rfloor$ the number of $(\leq
k)$-facets of a set of $n$ points in general position in $\mathbb{R}^d$ is at
least $(d+1)\binom{k+d}{d}$, and that this bound is tight in the given range of
$k$.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:19:11 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 13:11:12 GMT"
}
] | 2020-07-21T00:00:00 | [
[
"Aichholzer",
"Oswin",
""
],
[
"García",
"Jesús",
""
],
[
"Orden",
"David",
""
],
[
"Ramos",
"Pedro",
""
]
] | [
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] |
801.1037 | EDA Publishing Association | D. Mitrani, J. Salazar, A. Turo, M. J. Garc\'ia, J. A. Ch\'avez | Lumped and Distributed Parameter SPICE Models of TE Devices Considering
Temperature Dependent Material Properties | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | Based on simplified one-dimensional steady-state analysis of thermoelectric
phenomena and on analogies between thermal and electrical domains, we propose
both lumped and distributed parameter electrical models for thermoelectric
devices. For lumped parameter models, constant values for material properties
are extracted from polynomial fit curves evaluated at different module
temperatures (hot side, cold side, average, and mean module temperature). For
the case of distributed parameter models, material properties are calculated
according to the mean temperature at each segment of a sectioned device. A
couple of important advantages of the presented models are that temperature
dependence of material properties is considered and that they can be easily
simulated using an electronic simulation tool such as SPICE. Comparisons are
made between SPICE simulations for a single-pellet module using the proposed
models and with numerical simulations carried out with Mathematica software.
Results illustrate accuracy of the distributed parameter models and show how
inappropriate is to assume, in some cases, constant material parameters for an
entire thermoelectric element.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:10:08 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Mitrani",
"D.",
""
],
[
"Salazar",
"J.",
""
],
[
"Turo",
"A.",
""
],
[
"García",
"M. J.",
""
],
[
"Chávez",
"J. A.",
""
]
] | [
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] |
801.1038 | EDA Publishing Association | P. Borthen, G. Wachutka | A Modular High-Temperature Measurement Set-Up for Semiconductor Device
Characterization | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | We demonstrate the capabilities of a high temperature measurement set-up
recently developed at our institute. It is dedicated to the characterization of
semiconductor devices and test structures in the temperature range from room
temperature up to 500 degrees C and higher. A detailed description of the
experimental aquipment is given. Its practical use is demonstrated by measuring
temperature-dependent charcteristics of silicon VDMOSFET and IGBT devices as
well as SiC-diodes. For the silicon devices, numerical simulations based on
recently developed high temperature physical models were also performed in
order to gain a deeper understanding of the measured data, together with a
revalidation of the model parameters.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:12:01 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Borthen",
"P.",
""
],
[
"Wachutka",
"G.",
""
]
] | [
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] |
801.1039 | J. S. Kaastra | S. Bertone, J. Schaye, K. Dolag | Numerical simulations of the Warm-Hot Intergalactic Medium | 18 pages, 5 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 14; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9318-3 | null | astro-ph | null | In this paper we review the current predictions of numerical simulations for
the origin and observability of the warm hot intergalactic medium (WHIM), the
diffuse gas that contains up to 50 per cent of the baryons at z~0. During
structure formation, gravitational accretion shocks emerging from collapsing
regions gradually heat the intergalactic medium (IGM) to temperatures in the
range T~10^5-10^7 K. The WHIM is predicted to radiate most of its energy in the
ultraviolet (UV) and X-ray bands and to contribute a significant fraction of
the soft X-ray background emission. While O VI and C IV absorption systems
arising in the cooler fraction of the WHIM with T~10^5-10^5.5 K are seen in
FUSE and HST observations, models agree that current X-ray telescopes such as
Chandra and XMM-Newton do not have enough sensitivity to detect the hotter
WHIM. However, future missions such as Constellation-X and XEUS might be able
to detect both emission lines and absorption systems from highly ionised atoms
such as O VII, O VIII and Fe XVII.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:12:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bertone",
"S.",
""
],
[
"Schaye",
"J.",
""
],
[
"Dolag",
"K.",
""
]
] | [
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] |
801.104 | EDA Publishing Association | V. Szekely, S. Torok, E. Kollar | Improvements of the Variable Thermal Resistance | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | A flat mounting unit with electronically variable thermal resistance [1] has
been presented in the last year [2]. The design was based on a Peltier cell and
the appropriate control electronics and software. The device is devoted
especially to the thermal characterization of packages, e.g. in dual cold plate
arrangements. Although this design meets the requirements of the static
measurement we are intended to improve its parameters as the settling time and
dynamic thermal impedance and the range of realized thermal resistance. The new
design applies the heat flux sensor developed by our team as well [3], making
easier the control of the device. This development allows even the realization
of negative thermal resistances.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:16:46 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Szekely",
"V.",
""
],
[
"Torok",
"S.",
""
],
[
"Kollar",
"E.",
""
]
] | [
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] |
801.1041 | EDA Publishing Association | S. Grauby (CPMOH), L.-D. Patino Lopez, (CPMOH), A. Salhi (CPMOH), E.
Puyoo (CPMOH), J.-M. Rampnoux (CPMOH), W. Claeys (CPMOH), S. Dilhaire (CPMOH) | Joule Expansion Imaging Techniques on Microlectronic Devices | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | We have studied the electrically induced off-plane surface displacement on
two microelectronic devices using Scanning Joule Expansion Microscopy (SJEM).
We present the experimental method and surface displacement results. We show
that they can be successfully compared with surface displacement images
obtained using an optical interferometry method. We also present thermal images
using Scanning Thermal Microscopy (SThM) technique to underline that SJEM is
more adapted to higher frequency measurements, which should improve the spatial
resolution.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:17:21 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Grauby",
"S.",
"",
"CPMOH"
],
[
"Lopez",
"L. -D. Patino",
"",
"CPMOH"
],
[
"Salhi",
"A.",
"",
"CPMOH"
],
[
"Puyoo",
"E.",
"",
"CPMOH"
],
[
"Rampnoux",
"J. -M.",
"",
"CPMOH"
],
[
"Claeys",
"W.",
"",
"CPMOH"
],
[
"Dilhaire",
"S.",
"",
"CPMOH"
]
] | [
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] |
801.1042 | Albert Gapud | A. A. Gapud, D. K. Christen, R. Feenstra, F. A. List III, A. Khan | On narrowing coated conductor film: emergence of granularity-induced
field hysteresis of transport critical current | text-only: 10 pages, plus 5 figures on 5 pages | null | 10.1088/0953-2048/21/7/075016 | null | cond-mat.supr-con | null | Critical current density Jc in polycrystalline or granular superconducting
material is known to be hysteretic with applied field H due to the focusing of
field within the boundary between adjacent grains. This is of concern in the
so-called coated conductors wherein superconducting film is grown on a
granular, but textured surface of a metal substrate. While previous work has
mainly been on Jc determined using induced or magnetization currents, the
present work utilizes transport current via an applied potential in strip
geometry. It is observed that the effect is not as pronounced using transport
current, probably due to a large difference in criterion voltage between the
two types of measurements. However, when the films are narrowed by patterning
into 200-, 100-, or 80-micron, the hysteresis is clearly seen, because of the
forcing of percolation across higher-angle grain boundaries. This effect is
compared for films grown on ion-beam-assisted-deposited (IBAD) YSZ substrate
and those grown on rolling-assisted-biaxially-textures substrates (RABiTS)
which have grains that are about ten times larger. The hysteresis is more
pronounced for the latter, which is more likely to have a weak grain boundary
spanning the width of the microbridge. This is also of concern to applications
in which coated conductors will be striated in order to reduce of AC losses.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 20:26:34 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 18:03:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gapud",
"A. A.",
""
],
[
"Christen",
"D. K.",
""
],
[
"Feenstra",
"R.",
""
],
[
"List",
"F. A.",
"III"
],
[
"Khan",
"A.",
""
]
] | [
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801.1043 | EDA Publishing Association | Mahendra Wankhede,, V. Khaire, A. Goswami, S. D. Mahajan | Evaluation of Cooling Solutions for Outdoor Electronics | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | The thermal management of an outdoor electronic enclosure can be quite
challenging due to the additional thermal load from the sun and the requirement
of having an air-sealed enclosure. It is essential to consider the effect of
solar heating loads in the design process; otherwise, it can shorten the life
expectancy of the electronic product or lead to catastrophic failure. In this
paper we analyze and compare the effectiveness of different cooling techniques
used for outdoor electronics. Various cooling techniques were compared like
special coatings and paints on the outer surface, radiation shields,
double-walled vented enclosures, fans for internal air circulation and
air-to-air heat exchangers. A highly simplified, typical outdoor system was
selected for this study measuring approximately 300x300x400 mm (WxLxH). Solar
radiation was incident on 3 sides of the enclosure. There were 8 equally spaced
PCBs inside the enclosure dissipating 12.5W each uniformly (100 watts total). A
computational fluid dynamics (CFD) model of the system was built and analyzed.
This was followed by building a mock-up of the system and conducting
experiments to validate the CFD model. It was found that some of the simplest
cooling techniques like white oil paint on the outer surface can significantly
reduce the impact of solar loads. Adding internal circulation fans can also be
very effective. Using air-to-air heat exchangers was found to be the most
effective solution although it is more complex and costly.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:19:33 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Wankhede",
"Mahendra",
""
],
[
"Khaire",
"V.",
""
],
[
"Goswami",
"A.",
""
],
[
"Mahajan",
"S. D.",
""
]
] | [
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] |
801.1044 | EDA Publishing Association | W. Habra (LAAS), P. Tounsi, F. Madrid, P. Dupuy, C. Barbot (LAAS),
J.-M. Dorkel (LAAS) | A New Methodology for Extraction of Dynamic Compact Thermal Models | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | An innovative and accurate dynamic Compact Thermal Model extraction method is
proposed for multi-chip power electronics systems. It accounts for thermal
coupling between multiple heat sources. Transient electro-thermal coupling can
easily be taken into account by system designers. The method is based on a
definition of the Optimal Thermal Coupling Point, which is proven to be valid
even for transient modelling. Compared to the existing methods, the number of
needed 3D thermal simulations or measurements is significantly reduced.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:22:53 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Habra",
"W.",
"",
"LAAS"
],
[
"Tounsi",
"P.",
"",
"LAAS"
],
[
"Madrid",
"F.",
"",
"LAAS"
],
[
"Dupuy",
"P.",
"",
"LAAS"
],
[
"Barbot",
"C.",
"",
"LAAS"
],
[
"Dorkel",
"J. -M.",
"",
"LAAS"
]
] | [
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] |
801.1045 | EDA Publishing Association | M.-N. Sabry | Flexible profile approach to the conjugate heat transfer problem | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | The flexible profile approach proposed earlier to create CTM (compact or
reduced order thermal models) is extended to cover the area of conjugate heat
transfer. The flexible profile approach is a methodology that allows building a
highly boundary conditions independent CTM, with any desired degree of
accuracy, that may adequately replace detailed 3D models for the whole spectrum
of applications in which the modeled object may be used. The extension to
conjugate problems radically solves the problem of interfacing two different
domains. Each domain, fluid or solid, can be "compacted" independently creating
two CTM that can be joined together to produce reliable results for any
arbitrary set of external boundary conditions.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:23:21 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Sabry",
"M. -N.",
""
]
] | [
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801.1046 | EDA Publishing Association | R. Linderman, T. Brunschwiler, B. Smith, B. Michel | High Performance Thermal Interface Technology Overview | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | An overview on recent developments in thermal interfaces is given with a
focus on a novel thermal interface technology that allows the formation of 2-3
times thinner bondlines with strongly improved thermal properties at lower
assembly pressures. This is achieved using nested hierarchical surface channels
to control the particle stacking with highly particle-filled materials.
Reliability testing with thermal cycling has also demonstrated a decrease in
thermal resistance after extended times with longer overall lifetime compared
to a flat interface.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:24:32 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Linderman",
"R.",
""
],
[
"Brunschwiler",
"T.",
""
],
[
"Smith",
"B.",
""
],
[
"Michel",
"B.",
""
]
] | [
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0.0587209165,
-0.0320494883,
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801.1047 | EDA Publishing Association | A. Petropoulos, G. Kaltsas, D. Goustouridis, A.G. Nassiopoulou | A Novel Thermal Position Sensor Integrated On A Plastic Substrate | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | A thermal position sensor was fabricated and evaluated. The device consists
of an array of temperature sensing elements, fabricated entirely on a plastic
substrate. A novel fabrication technology was implemented which allows direct
integration with read out electronics and communication to the macro-world
without the use of wire bonding. The fabricated sensing elements are
temperature sensitive Pt resistors with an average TCR of 0.0024/C. The device
realizes the detection of the position and the motion of a heating source by
monitoring the resistance variation of the thermistor array. The application
field of such a cost-effective position sensor is considered quite extensive.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:25:50 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Petropoulos",
"A.",
""
],
[
"Kaltsas",
"G.",
""
],
[
"Goustouridis",
"D.",
""
],
[
"Nassiopoulou",
"A. G.",
""
]
] | [
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] |
801.1048 | J. S. Kaastra | K. Dolag, A.M. Bykov, A. Diaferio | Non-thermal processes in cosmological simulations | 27 pages, 16 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 15; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9319-2 | null | astro-ph | null | Non-thermal components are key ingredients for understanding clusters of
galaxies. In the hierarchical model of structure formation, shocks and
large-scale turbulence are unavoidable in the cluster formation processes.
Understanding the amplification and evolution of the magnetic field in galaxy
clusters is necessary for modelling both the heat transport and the dissipative
processes in the hot intra-cluster plasma. The acceleration, transport and
interactions of non-thermal energetic particles are essential for modelling the
observed emissions. Therefore, the inclusion of the non-thermal components will
be mandatory for simulating accurately the global dynamical processes in
clusters. In this review, we summarise the results obtained with the
simulations of the formation of galaxy clusters which address the issues of
shocks, magnetic field, cosmic ray particles and turbulence.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:27:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dolag",
"K.",
""
],
[
"Bykov",
"A. M.",
""
],
[
"Diaferio",
"A.",
""
]
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801.1049 | EDA Publishing Association | R. John, G. Atxaga, H. J. Frerker, A. Newerla | Advancement of Multifunctional support structure technologies (AMFSST) | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | The multifunctional support structure (MFSS) technology is promising a
reduction of overall mass and packing volume for spacecraft (S/C) electronic
components. This technology eliminates the electronic box chassis and the
cabling between the boxes by integrating the electronics, thermal control and
the structural support into one single element. The ultimate goal of the MFSS
technology is to reduce size, weight, power consumption, cost and production
time for future spacecraft components. The paper focus on the main challenges
and solutions related to the thermal management within the MFSS technology
based on the selected charge regulator (CR) application. Starting with the main
set of thermal requirements for the CR the paper will include, conceptual and
detailed design based on highconductivity carbon fibre CFRP, description and
results of the thermal material sample test program ; parameter and results for
the performed first thermal simulation
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:31:22 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"John",
"R.",
""
],
[
"Atxaga",
"G.",
""
],
[
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"H. J.",
""
],
[
"Newerla",
"A.",
""
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801.105 | Boris Tsirelson | Boris Tsirelson | Moderate deviations for random fields and random complex zeroes | 56 pages | null | null | null | math.PR | null | Moderate deviations for random complex zeroes are deduced from a new theorem
on moderate deviations for random fields.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:35:48 GMT"
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[
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] |
801.1051 | Irit Idan | Irit Idan, Jean-Pierre Lasota, Jean-Marie Hameury, Giora Shaviv | Spectra of accretion discs around white dwarfs | 10 pages. Talk presented at "Jean-Pierre Lasota, X-ray binaries,
accretion disks and compact stars" (October 2007); Abramowicz, M. Ed., New
Astron. Rev., in press | New Astron.Rev.51:759-767,2008 | 10.1016/j.newar.2008.03.004 | null | astro-ph | null | We present spectra of accretion discs around white-dwarfs calculated with an
improved and updated version of the Shaviv & Wehrse (1991) model. The new
version includes line opacities and convective energy transport and can be used
to calculate spectra of hot discs in bright systems (nova--like variables or
dwarf novae in outburst) as well as spectra of cold accretion discs in
quiescent dwarf novae.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:29:47 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 22:02:09 GMT"
},
{
"version": "v3",
"created": "Wed, 30 Jan 2008 19:22:27 GMT"
},
{
"version": "v4",
"created": "Mon, 4 Feb 2008 17:08:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Idan",
"Irit",
""
],
[
"Lasota",
"Jean-Pierre",
""
],
[
"Hameury",
"Jean-Marie",
""
],
[
"Shaviv",
"Giora",
""
]
] | [
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] |
801.1052 | J. S. Kaastra | N. Werner, F. Durret, T. Ohashi, S. Schindler, R.P.C. Wiersma | Observations of metals in the intra-cluster medium | 28 pages, 12 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 16; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9320-9 | null | astro-ph | null | Because of their deep gravitational potential wells, clusters of galaxies
retain all the metals produced by the stellar populations of the member
galaxies. Most of these metals reside in the hot plasma which dominates the
baryon content of clusters. This makes them excellent laboratories for the
study of the nucleosynthesis and chemical enrichment history of the Universe.
Here we review the history, current possibilities and limitations of the
abundance studies, and the present observational status of X-ray measurements
of the chemical composition of the intra-cluster medium. We summarise the
latest progress in using the abundance patterns in clusters to put constraints
on theoretical models of supernovae and we show how cluster abundances provide
new insights into the star-formation history of the Universe.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:36:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Werner",
"N.",
""
],
[
"Durret",
"F.",
""
],
[
"Ohashi",
"T.",
""
],
[
"Schindler",
"S.",
""
],
[
"Wiersma",
"R. P. C.",
""
]
] | [
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] |
801.1053 | Stanislav Kuperstein | Chethan Krishnan, Stanislav Kuperstein | Gauge Theory RG Flows from a Warped Resolved Orbifold | 32 pages, 3 eps figures; v2: reference added; v3: JHEP version | JHEP 0804:009,2008 | 10.1088/1126-6708/2008/04/009 | ULB-TH/07-35 | hep-th | null | We study gauge-string duality of D3-branes localized at a point on the
resolution of the ALE orbifold $\IC^3/\IZ_3$. By explicitly solving for the
warp factor, we demonstrate the holographic RG flow from $AdS_5 \times
S^5/\IZ_3$ (far away from the resolution) to the usual $AdS_5\times S^5$ (close
to the stack). On the gauge theory side, this maps to the flow between the
quiver gauge theory and ${\cal N}=4$ super Yang-Mills. We present two possible
scenarios for this RG flow depending on the choice of the VEVs. In particular,
one of the scenarios proceeds by two steps involving both Higgsing and
confinement.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:37:21 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Jan 2008 12:54:58 GMT"
},
{
"version": "v3",
"created": "Sat, 29 Mar 2008 21:57:19 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Krishnan",
"Chethan",
""
],
[
"Kuperstein",
"Stanislav",
""
]
] | [
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] |
801.1054 | Andrea Surroca | Andrea Surroca Ortiz | Conjectural estimates on the Mordell-Weil and Tate-Shafarevich groups of
an abelian variety | 38 pages. Submitted version. This version improves substantially, in
many ways, the unpublished previous version arXiv:0801.1054. In particular,
Masser's lower bound for non-torsion points is replaced by Bosser-Gaudron's
lower bound. The analytic estimates on the L-function, as well as the part
relying the Tamagawa numbers and the Faltings' height were also substantially
modified | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an abelian variety defined over a number field. We give
conditional bounds for the order of its Tate-Shafarevich group, as well as
conditional bounds for the N\'eron-Tate height of generators of its
Mordell-Weil group. The bounds are implied by strong but nowadays classical
conjectures, such as the Birch and Swinnerton-Dyer conjecture and the
functional equation of the L-series. In particular, we improve and generalise a
result by D. Goldfeld and L. Szpiro on the order of the Tate-Shafarevich group,
and extends a conjecture of S. Lang on the canonical height of a system of
generators of the free part of the Mordell-Weil group. The method is an
extension of the algorithm proposed by Yu. Manin for finding a basis for the
non-torsion rational points of an elliptic curve defined over the rationals.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:39:29 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Jan 2020 09:47:36 GMT"
}
] | 2020-01-15T00:00:00 | [
[
"Ortiz",
"Andrea Surroca",
""
]
] | [
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] |
801.1055 | Sergej Flach | K.G. Mishagin, S. Flach, O.I. Kanakov and M.V. Ivanchenko | q-breathers in Discrete Nonlinear Schroedinger lattices | 19 pages, 9 figures | null | 10.1088/1367-2630/10/7/073034 | null | nlin.PS nlin.SI | null | $q$-breathers are exact time-periodic solutions of extended nonlinear systems
continued from the normal modes of the corresponding linearized system. They
are localized in the space of normal modes. The existence of these solutions in
a weakly anharmonic atomic chain explained essential features of the
Fermi-Pasta-Ulam (FPU) paradox. We study $q$-breathers in one- two- and
three-dimensional discrete nonlinear Sch\"{o}dinger (DNLS) lattices --
theoretical playgrounds for light propagation in nonlinear optical waveguide
networks, and the dynamics of cold atoms in optical lattices. We prove the
existence of these solutions for weak nonlinearity. We find that the
localization of $q$-breathers is controlled by a single parameter which depends
on the norm density, nonlinearity strength and seed wave vector. At a critical
value of that parameter $q$-breathers delocalize via resonances, signaling a
breakdown of the normal mode picture and a transition into strong mode-mode
interaction regime. In particular this breakdown takes place at one of the
edges of the normal mode spectrum, and in a singular way also in the center of
that spectrum. A stability analysis of $q$-breathers supplements these
findings. For three-dimensional lattices, we find $q$-breather vortices, which
violate time reversal symmetry and generate a vortex ring flow of energy in
normal mode space.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:40:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mishagin",
"K. G.",
""
],
[
"Flach",
"S.",
""
],
[
"Kanakov",
"O. I.",
""
],
[
"Ivanchenko",
"M. V.",
""
]
] | [
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] |
801.1056 | EDA Publishing Association | K. Nakabayashi, T. Nakabayashi, K. Nakajima | Very Fast Chip-level Thermal Analysis | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | We present a new technique of VLSI chip-level thermal analysis. We extend a
newly developed method of solving two dimensional Laplace equations to thermal
analysis of four adjacent materials on a mother board. We implement our
technique in C and compare its performance to that of a commercial CAD tool.
Our experimental results show that our program runs 5.8 and 8.9 times faster
while keeping smaller residuals by 5 and 1 order of magnitude, respectively.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:44:14 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Nakabayashi",
"K.",
""
],
[
"Nakabayashi",
"T.",
""
],
[
"Nakajima",
"K.",
""
]
] | [
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] |
801.1057 | Jacek Jurkowski | Andrzej Kossakowski, Rolando Rebolledo | On completely positive non-Markovian evolution of a d-level system | null | null | 10.1142/9789814273756_0011 | null | quant-ph | null | A sufficient condition for non-Markovian master equation which ensures the
complete positivity of the resulting time evolution is presented.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:45:02 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Kossakowski",
"Andrzej",
""
],
[
"Rebolledo",
"Rolando",
""
]
] | [
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] |
801.1058 | EDA Publishing Association | J. Hu, L. Yang, M.-W. Shin | Thermal And Mechanical Analysis of High-power Light-emitting Diodes with
Ceramic Packages | Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions) | Dans 13th International Worshop on THERMal INvestigations of ICs
and Systems - THERMINIC 2007, Budapest : Hongrie (2007) | null | null | physics.gen-ph | null | In this paper we present the thermal and mechanical analysis of high-power
light-emitting diodes (LEDs) with ceramic packages. Transient thermal
measurements and thermo-mechanical simulation were performed to study the
thermal and mechanical characteristics of ceramic packages. Thermal resistance
from the junction to the ambient was decreased from 76.1 oC/W to 45.3 oC/W by
replacing plastic mould to ceramic mould for LED packages. Higher level of
thermo-mechanical stresses in the chip were found for LEDs with ceramic
packages despite of less mismatching coefficients of thermal expansion
comparing with plastic packages. The results suggest that the thermal
performance of LEDs can be improved by using ceramic packages, but the mounting
process of the high power LEDs with ceramic packages is critically important
and should be in charge of delaminating interface layers in the packages.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:45:10 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Hu",
"J.",
""
],
[
"Yang",
"L.",
""
],
[
"Shin",
"M. -W.",
""
]
] | [
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] |
801.1059 | Frank Vallentin | Christine Bachoc, Gabriele Nebe, Fernando Mario de Oliveira Filho,
Frank Vallentin | Lower bounds for measurable chromatic numbers | 18 pages, (v3) Section 8 revised and some corrections, to appear in
Geometric and Functional Analysis | Geom. Funct. Anal. 19 (2009), 645-661 | 10.1007/s00039-009-0013-7 | null | math.CO math.CA math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lovasz theta function provides a lower bound for the chromatic number of
finite graphs based on the solution of a semidefinite program. In this paper we
generalize it so that it gives a lower bound for the measurable chromatic
number of distance graphs on compact metric spaces.
In particular we consider distance graphs on the unit sphere. There we
transform the original infinite semidefinite program into an infinite linear
program which then turns out to be an extremal question about Jacobi
polynomials which we solve explicitly in the limit. As an application we derive
new lower bounds for the measurable chromatic number of the Euclidean space in
dimensions 10,..., 24, and we give a new proof that it grows exponentially with
the dimension.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 20:01:02 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Aug 2008 09:59:34 GMT"
},
{
"version": "v3",
"created": "Fri, 17 Jul 2009 09:38:07 GMT"
}
] | 2009-11-21T00:00:00 | [
[
"Bachoc",
"Christine",
""
],
[
"Nebe",
"Gabriele",
""
],
[
"Filho",
"Fernando Mario de Oliveira",
""
],
[
"Vallentin",
"Frank",
""
]
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801.106 | Navin Kashyap | Akiko Manada and Navin Kashyap | On the Period of a Periodic-Finite-Type Shift | revised version; 5 pages; to appear in the Proceedings of the 2008
IEEE International Symposium on Information Theory (ISIT'08), Toronto, Canada | null | null | null | cs.IT math.IT | null | Periodic-finite-type shifts (PFT's) form a class of sofic shifts that
strictly contains the class of shifts of finite type (SFT's). In this paper, we
investigate how the notion of "period" inherent in the definition of a PFT
causes it to differ from an SFT, and how the period influences the properties
of a PFT.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:53:32 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Apr 2008 15:19:23 GMT"
}
] | 2008-04-30T00:00:00 | [
[
"Manada",
"Akiko",
""
],
[
"Kashyap",
"Navin",
""
]
] | [
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] |
801.1061 | J. S. Kaastra | S. Schindler, A. Diaferio | Metal enrichment processes | 18 pages, 8 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 17; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9321-8 | null | astro-ph | null | There are many processes that can transport gas from the galaxies to their
environment and enrich the environment in this way with metals. These metal
enrichment processes have a large influence on the evolution of both the
galaxies and their environment. Various processes can contribute to the gas
transfer: ram-pressure stripping, galactic winds, AGN outflows, galaxy-galaxy
interactions and others. We review their observational evidence, corresponding
simulations, their efficiencies, and their time scales as far as they are known
to date. It seems that all processes can contribute to the enrichment. There is
not a single process that always dominates the enrichment, because the
efficiencies of the processes vary strongly with galaxy and environmental
properties.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:50:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schindler",
"S.",
""
],
[
"Diaferio",
"A.",
""
]
] | [
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] |
801.1062 | J. S. Kaastra | S. Borgani, D. Fabjan, L. Tornatore, S. Schindler, K. Dolag, A.
Diaferio | The chemical enrichment of the ICM from hydrodynamical simulations | 25 pages, 11 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 18; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9322-7 | null | astro-ph | null | The study of the metal enrichment of the intra-cluster and inter-galactic
media (ICM and IGM) represents a direct means to reconstruct the past history
of star formation, the role of feedback processes and the gas-dynamical
processes which determine the evolution of the cosmic baryons. In this paper we
review the approaches that have been followed so far to model the enrichment of
the ICM in a cosmological context. While our presentation will be focused on
the role played by hydrodynamical simulations, we will also discuss other
approaches based on semi-analytical models of galaxy formation, also critically
discussing pros and cons of the different methods. We will first review the
concept of the model of chemical evolution to be implemented in any
chemo-dynamical description. We will emphasise how the predictions of this
model critically depend on the choice of the stellar initial mass function, on
the stellar life-times and on the stellar yields. We will then overview the
comparisons presented so far between X-ray observations of the ICM enrichment
and model predictions. We will show how the most recent chemo-dynamical models
are able to capture the basic features of the observed metal content of the ICM
and its evolution. We will conclude by highlighting the open questions in this
study and the direction of improvements for cosmological chemo-dynamical models
of the next generation.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 16:57:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Borgani",
"S.",
""
],
[
"Fabjan",
"D.",
""
],
[
"Tornatore",
"L.",
""
],
[
"Schindler",
"S.",
""
],
[
"Dolag",
"K.",
""
],
[
"Diaferio",
"A.",
""
]
] | [
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801.1063 | Ivan Titov | Ivan Titov and Ryan McDonald | Modeling Online Reviews with Multi-grain Topic Models | null | null | null | null | cs.IR cs.DB | null | In this paper we present a novel framework for extracting the ratable aspects
of objects from online user reviews. Extracting such aspects is an important
challenge in automatically mining product opinions from the web and in
generating opinion-based summaries of user reviews. Our models are based on
extensions to standard topic modeling methods such as LDA and PLSA to induce
multi-grain topics. We argue that multi-grain models are more appropriate for
our task since standard models tend to produce topics that correspond to global
properties of objects (e.g., the brand of a product type) rather than the
aspects of an object that tend to be rated by a user. The models we present not
only extract ratable aspects, but also cluster them into coherent topics, e.g.,
`waitress' and `bartender' are part of the same topic `staff' for restaurants.
This differentiates it from much of the previous work which extracts aspects
through term frequency analysis with minimal clustering. We evaluate the
multi-grain models both qualitatively and quantitatively to show that they
improve significantly upon standard topic models.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:01:34 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Titov",
"Ivan",
""
],
[
"McDonald",
"Ryan",
""
]
] | [
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] |
801.1064 | J. S. Kaastra | F.B.S. Paerels, J.S. Kaastra, T. Ohashi, P. Richter, A.M. Bykov, J.
Nevalainen | Future instrumentation for the study of the Warm-Hot Intergalactic
Medium | 16 pages, 4 figures, accepted for publication in Space Science
Reviews, special issue "Clusters of galaxies: beyond the thermal view",
Editor J.S. Kaastra, Chapter 19; work done by an international team at the
International Space Science Institute (ISSI), Bern, organised by J.S.
Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker | null | 10.1007/s11214-008-9323-6 | null | astro-ph | null | We briefly review capabilities and requirements for future instrumentation in
UV- and X-ray astronomy that can contribute to advancing our understanding of
the diffuse, highly ionised intergalactic medium.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:03:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Paerels",
"F. B. S.",
""
],
[
"Kaastra",
"J. S.",
""
],
[
"Ohashi",
"T.",
""
],
[
"Richter",
"P.",
""
],
[
"Bykov",
"A. M.",
""
],
[
"Nevalainen",
"J.",
""
]
] | [
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] |
801.1065 | Magaretha Pretorius | Magaretha L. Pretorius and Christian Knigge | An Halpha-selected sample of cataclysmic variables -- I. Observations of
newly discovered systems | 15 pages, 8 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12933.x | null | astro-ph | null | Strong selection effects are present in observational samples of cataclysmic
variables (CVs), complicating comparisons to theoretical predictions. The
selection criteria used to define most CV samples discriminate heavily against
the discovery of short-period, intrinsically faint systems. The situation can
be improved by selecting CVs for the presence of emission lines. For this
reason, we have constructed a homogeneous sample of CVs selected on the basis
of Halpha emission. We present discovery observations of the 14 CVs and 2
additional CV candidates found in this search. The orbital periods of 11 of the
new CVs were measured; all are above 3 h. There are two eclipsing systems in
the sample, and one in which we observed a quasi-periodic modulation on a \sim
1000 s time-scale. We also detect the secondary star in the spectrum of one
system, and measure its spectral type. Several of the new CVs have the
spectroscopic appearance of nova-like variables (NLs), and a few display what
may be SW Sex star behaviour. In a companion paper, we discuss the implications
of this new sample for CV evolution.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:09:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pretorius",
"Magaretha L.",
""
],
[
"Knigge",
"Christian",
""
]
] | [
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] |
801.1066 | Joel Merker | Joel Merker | On Wittgenstein's philosophy of mathematics | Written in French | null | null | null | math.HO | null | Mathematics cannot anymore be assimilated to a linguistic game, where formal
proofs are strongly differentiated with conjectural thinking, without building
any category of knowledge to understand the passage (Wittgenstein's gist).
Nowadays, philosophy has to face with the growing, exponential ramified tree of
speculative mathematical thinking. Our main (problematical) theses are: 1. In
mathematics, there is no empirical automatism, and no separate, physical-like
motricity. 2: The irreversible-synthetical must force to complexify the
exegetical game of philosophy; numerical experiments in algebra and in number
theory are a kind of letting blow up all possible problems; 4. The nature of
mathematical questioning still remains in question.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:11:07 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Merker",
"Joel",
""
]
] | [
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801.1067 | Thorsten Hehn | Johannes B. Huber and Thorsten Hehn | The lowest-possible BER and FER for any discrete memoryless channel with
given capacity | Accepted as a Transactions on Communications Letter,9 Pages, 4
Figures | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate properties of a channel coding scheme leading to the
minimum-possible frame error ratio when transmitting over a memoryless channel
with rate R>C. The results are compared to the well-known properties of a
channel coding scheme leading to minimum bit error ratio. It is concluded that
these two optimization requests are contradicting. A valuable application of
the derived results is presented.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:12:54 GMT"
},
{
"version": "v2",
"created": "Tue, 20 May 2008 09:22:16 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Mar 2009 21:27:40 GMT"
},
{
"version": "v4",
"created": "Fri, 20 Mar 2009 23:30:23 GMT"
}
] | 2009-03-21T00:00:00 | [
[
"Huber",
"Johannes B.",
""
],
[
"Hehn",
"Thorsten",
""
]
] | [
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] |
801.1068 | Brijesh Kumar | B. Kumar, R. Sagar and J. Melnick | CCD photometric and mass function study of 9 young Large Magellanic
Cloud star clusters | To appear in MNRAS | null | 10.1111/j.1365-2966.2008.12926.x | null | astro-ph | null | We present CCD photometric and mass function study of 9 young Large
Magellanic Cloud star clusters namely NGC 1767, NGC 1994, NGC 2002, NGC 2003,
NGC 2006, SL 538, NGC 2011, NGC 2098 and NGC 2136. The BVRI data reaching down
to V ~ 21 mag, are collected from 3.5-meter NTT/EFOSC2 in sub-arcsec seeing
conditions. For NGC 1767, NGC 1994, NGC 2002, NGC 2003, NGC 2011 and NGC 2136,
broad band photometric CCD data are presented for the first time. Seven of the
9 clusters have ages between 16 to 25 Myr while remaining two clusters have
ages $32\pm4$ Myr (NGC 2098) and $90\pm10$ Myr (NGC 2136). For 7 younger
clusters, the age estimates based on a recent model and the integrated spectra
are found to be systematically lower ($\sim$ 10 Myr) from the present estimate.
In the mass range of $\sim 2 - 12$ $M_{\odot}$, the MF slopes for 8 out of nine
clusters were found to be similar with the value of $\gamma$ ranging from
$-1.90\pm0.16$ to $-2.28\pm0.21$. For NGC 1767 it is flatter with $\gamma =
-1.23\pm0.27$. Mass segregation effects are observed for NGC 2002, NGC 2006,
NGC 2136 and NGC 2098. This is consistent with the findings of Kontizas et al.
for NGC 2098. Presence of mass segregation in these clusters could be an
imprint of star formation process as their ages are significantly smaller than
their dynamical evolution time. Mean MF slope of $\gamma = -2.22\pm0.16$
derived for a sample of 25 young ($\le 100$ Myr) dynamically unevolved LMC
stellar systems provide support for the universality of IMF in the intermediate
mass range $\sim 2-12 M_{\odot}$.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 18:51:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kumar",
"B.",
""
],
[
"Sagar",
"R.",
""
],
[
"Melnick",
"J.",
""
]
] | [
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] |
801.1069 | Richard Rand | Richard J. Rand and Robert A. Benjamin | Vertically Extended Neutral Gas in the Massive Edge-on Spiral NGC 5746 | 55 pages, 20 figures | null | 10.1086/528952 | null | astro-ph | null | We present Very Large Array 21-cm observations of the massive edge-on spiral
galaxy NGC 5746. This galaxy has recently been reported to have a luminous
X-ray halo, which has been taken as evidence of residual hot gas as predicted
in galaxy formation scenarios. Such models also predict that some of this gas
should undergo thermal instabilities, leading to a population of warm clouds
falling onto the disk. If so, then one might expect to find a vertically
extended neutral layer. We detect a substantial high-latitude component, but
conclude that almost all of its mass of 1.2-1.6 billion solar masses most
likely resides in a warp. Four features far from the plane containing about 100
million solar masses are found at velocities distinct from this warp. These
clouds may be associated with the expected infall, although an origin in a
disk-halo flow cannot be ruled out, except for one feature which is
counter-rotating. The warp itself may be a result of infall according to recent
models. But clearly this galaxy lacks a massive, lagging neutral halo as found
in NGC 891. The disk HI is concentrated into two rings of radii 1.5 and 3
arcminutes. Radial inflow is found in the disk, probably due to the bar in this
galaxy. A nearby member of this galaxy group, NGC 5740, is also detected. It
shows a prominent one-sided extension which may be the result of ram pressure
stripping.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:25:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rand",
"Richard J.",
""
],
[
"Benjamin",
"Robert A.",
""
]
] | [
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] |
801.107 | Magaretha Pretorius | Magaretha L. Pretorius and Christian Knigge | An Halpha-selected sample of cataclysmic variables -- II. Implications
for CV evolution | 10 pages, 4 figures, accepted for publication in MNRAS. Corrected
typo | null | 10.1111/j.1365-2966.2008.12934.x | null | astro-ph | null | We use an independent new sample of cataclysmic variables (CVs), constructed
by selecting objects for Halpha emission, to constrain the properties of the
intrinsic CV population. This sample is restricted to systems that are likely
to be non-magnetic and unevolved; it consists of 17 CVs, of which at least 10
have orbital periods above 3 h. We find that even very generous allowance for
selection effects is not sufficient to reconcile the large ratio of short- to
long-period CVs predicted by standard CV evolution theory with the observed
sample, possibly implying that short-period systems evolve faster than
predicted by the disrupted magnetic braking model. This would require that an
angular momentum loss mechanism, besides gravitational radiation, acts on CVs
with orbital periods below the period gap. To bring the model into agreement
with observations, the rate of angular momentum loss below the period gap must
be increased by a factor of at least 3, unless the model also over estimates
the angular momentum loss rate of long-period CVs.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:17:25 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 11:19:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pretorius",
"Magaretha L.",
""
],
[
"Knigge",
"Christian",
""
]
] | [
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] |
801.1071 | John M. Fregeau | John M. Fregeau | X-Ray Binaries and the Dynamical States of Globular Clusters | Conference proceedings from "A Population Explosion: The Nature and
Evolution of X-ray Binaries in Diverse Environments," 28 Oct - 2 Nov, St.
Petersburg Beach, FL. 4 pages | AIP Conf.Proc.1010:378-381,2008 | 10.1063/1.2945080 | null | astro-ph | null | We summarize and discuss recent work (Fregeau 2007) that presents the
confluence of three results suggesting that most Galactic globular clusters are
still in the process of core contraction, and have not yet reached the thermal
equilibrium phase driven by binary scattering interactions: that 1) the three
clusters that appear to be overabundant in X-ray binaries per unit encounter
frequency are observationally classified as "core-collapsed," 2) recent
numerical simulations of cluster evolution with primordial binaries show that
structural parameters of clusters in the binary-burning phase agree only with
"core-collapsed" clusters, and 3) a cluster in the binary-burning phase for the
last few Gyr should have about 5 times more dynamically formed X-ray sources
than if it were in the core contraction phase for the same time.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:19:03 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Fregeau",
"John M.",
""
]
] | [
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] |
801.1072 | Roberto Capuzzo-Dolcetta | R. Capuzzo-Dolcetta (1), P. Miocchi (1) ((1) Dep. of Physics,
Sapienza, Univ. of Roma, Roma, Italy) | Merging of globular clusters within inner galactic regions. II. The
Nuclear Star Cluster formation | 18 pages, 10 figures, 3 tables. Submitted to ApJ, main journal | null | 10.1086/588017 | null | astro-ph | null | In this paper we present the results of two detailed N-body simulations of
the interaction of a sample of four massive globular clusters in the inner
region of a triaxial galaxy. A full merging of the clusters takes place,
leading to a slowly evolving cluster which is quite similar to observed Nuclear
Clusters. Actually, both the density and the velocity dispersion profiles match
qualitatively, and quantitatively after scaling, with observed features of many
nucleated galaxies. In the case of dense initial clusters, the merger remnant
shows a density profile more concentrated than that of the progenitors, with a
central density higher than the sum of the central progenitors central
densities. These findings support the idea that a massive Nuclear Cluster may
have formed in early phases of the mother galaxy evolution and lead to the
formation of a nucleus, which, in many galaxies, has indeed a luminosity
profile similar to that of an extended King model. A correlation with galactic
nuclear activity is suggested.
| [
{
"version": "v1",
"created": "Mon, 7 Jan 2008 17:21:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Capuzzo-Dolcetta",
"R.",
""
],
[
"Miocchi",
"P.",
""
]
] | [
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