Showing 2004Show all

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astro-ph2004★ 170 cited

On the polar caps of the 3 Musketeers

A. De Luca, P. A. Caraveo, S. Mereghetti +2

XMM-Newton observations of PSR B0656+14, PSR B1055-52 and Geminga have substantially increased the statistics available for these three isolated neutron stars, so apparently simila…

cond-mat.str-el2004★ 14 cited

Theoretical studies of the phase transition in the anisotropic 2-D square spin lattice

Mohamad Al Hajj, Nathalie Guihery, Jean-Paul Malrieu +1

The phase transition occurring in a square 2-D spin lattice governed by an anisotropic Heisenberg Hamiltonian has been studied according to two recently proposed methods. The first…

cond-mat.soft2004★ 74 cited

Segregation in aqueous methanol enhanced by cooling and compression

L. Dougan, R. Hargreaves, S. P. Bates +4

Molecular segregation in methanol-water mixtures is studied across a wide concentration range as a function of temperature and pressure. Cluster distributions obtained from both ne…

cond-mat.soft2004★ 308 cited

Methanol-water solutions: a bi-percolating liquid mixture

L. Dougan, S. P. Bates, R. Hargreaves +5

An extensive series of neutron diffraction experiments and molecular dynamics simulations has shown that mixtures of methanol and water exhibit extended structures in solution desp…

astro-ph2004★ 69 cited

On the high coherence of kilo-Hz Quasi-Periodic Oscillations

D. Barret, W. Kluzniak, J. F. Olive +2

We have carried out a systematic study of the properties of the kilo-Hertz quasi-periodic oscillations (QPO) observed in the X-ray emission of the neutron star low-mass X-ray binar…

quant-ph2004★ 20 cited

Quantum computation and analysis of Wigner and Husimi functions: toward a quantum image treatment

M. Terraneo, B. Georgeot, D. L. Shepelyansky

We study the efficiency of quantum algorithms which aim at obtaining phase space distribution functions of quantum systems. Wigner and Husimi functions are considered. Different qu…

cond-mat.mes-hall2004★ 33 cited

On the properties of surface reconstructed silicon nanowires

R. Rurali, N. Lorente

We study by means of density-functional calculations the role of lateral surface reconstructions in determining the electrical properties of <100> silicon nanowires. The different…

cond-mat.mes-hall2004★ 169 cited

Metallic and semi-metallic <100> silicon nanowires

R. Rurali, N. Lorente

Silicon nanowires grown along the <100>-direction with a bulk Si core are studied with density functional calculations. Two surface reconstructions prevail after exploration of a l…

cond-mat.str-el2004★ 7 cited

The Gap Function Phi(k,w) for a Two-leg t-J Ladder and the Pairing Interaction

Didier Poilblanc, Douglas J. Scalapino

The gap function phi(k,omega), determined from a Lanczos calculation for a doped 2-leg t-J ladder, is used to provide insight into the spatial and temporal structure of the pairing…

math.PR2004

Explicit formulas for a continuous stochastic maturation model. Application to anticancer drug pharmacokinetics/pharmacodynamics

Djalil Chafai, Didier Concordet

We present a continuous time model of maturation and survival, obtained as the limit of a compartmental evolution model when the number of compartments tends to infinity. We establ…

cond-mat.str-el2004★ 19 cited

Phase transitions in the Shastry-Sutherland lattice

Mohamad Al Hajj, Jean-Paul Malrieu

Two recently developed theoretical approaches are applied to the Shastry-Sutherland lattice, varying the ratio between the couplings on the square lattice and on the oblique…

cond-mat.stat-mech2004★ 20 cited

Persistence of Randomly Coupled Fluctuating Interfaces

Satya N. Majumdar, Dibyendu Das

We study the persistence properties in a simple model of two coupled interfaces characterized by heights h_1 and h_2 respectively, each growing over a d-dimensional substrate. The…

cond-mat.other2004★ 3 cited

Time resolved fission in metal clusters

P. M. Dinh, P. -G. Reinhard, E. Suraud

We explore from a theoretical point of view pump and probe (P&P) analysis for fission of metal clusters where probe pulses are generalized to allow for scanning various frequencies…

math.ST2004★ 10 cited

On nonparametric maximum likelihood for a class of stochastic inverse problems

Djalil Chafai, Jean-Michel Loubes

We establish the consistency of a nonparametric maximum likelihood estimator for a class of stochastic inverse problems. We proceed by embedding the framework into the general sett…

cond-mat.str-el2004★ 5 cited

A self-consistent perturbative evaluation of ground state energies: application to cohesive energies of spin lattices

Mohamad Al Hajj, Jean-Paul Malrieu

The work presents a simple formalism which proposes an estimate of the ground state energy from a single reference function. It is based on a perturbative expansion but leads to no…

astro-ph2004★ 153 cited

H.E.S.S. Observations of PKS 2155-304

The H. E. S. S. Collaboration, :, F. Aharonian

The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 sigma) at energies greater than 160 GeV, using the H.E.S.S. stereosc…

astro-ph2004★ 509 cited

High-energy particle acceleration in the shell of a supernova remnant

H. E. S. S. Collaboration, :, F. Aharonian

A significant fraction of the energy density of the interstellar medium is in the form of high-energy charged particles (cosmic rays). The origin of these particles remains uncerta…

cond-mat.supr-con2004★ 27 cited

Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films

C. Ferdeghini, V. Ferrando, C. Tarantini +11

Upper critical fields of several magnesium diboride thin films were measured up to 28 T at the Grenoble High Magnetic Field Laboratory (GHMFL) in Grenoble and up to 60 T at the Lab…

astro-ph2004★ 79 cited

Whole Earth Telescope observations of BPM 37093: a seismological test of crystallization theory in white dwarfs

A. Kanaan, A. Nitta, D. E. Winget +3

BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (~ 1.1 M_sun) to theoretically crystallize while still inside the ZZ Ceti instabilit…

cond-mat.mes-hall2004★ 13 cited

Modeling of inelastic transport in one-dimensional metallic atomic wires

Thomas Frederiksen, Mads Brandbyge, Nicolas Lorente +1

Inelastic effects in electron transport through nano-sized devices are addressed with a method based on nonequilibrium Green's functions (NEGF) and perturbation theory to infinite…

astro-ph2004★ 1 cited

Jet-Disc coupling in the accreting black hole XTEJ1118+480

Julien Malzac, Andrea Merloni, Andrew C. Fabian

We interpret the rapid correlated UV/optical/ X-ray variability of XTEJ1118+480 as a signature of the coupling between the X-ray corona and a jet emitting synchrotron radiation in…

math.GT2004★ 2 cited

Non-singular graph-manifolds of dimension 4

A. Mozgova

A compact 4-dimensional manifold is a non-singular graph-manifold if it can be obtained by the glueing T^2-bundles over compact surfaces (with boundary) of negative Euler character…

cond-mat.str-el2004★ 26 cited

A renormalized excitonic method in terms of block excitations. Application to spin lattices

Mohamad Al Hajj, Jean-Paul Malrieu, Nathalie Guihéry

Dividing the lattice into blocks with singlet ground state and knowing the exact low energy spectrum of the blocks and of dimers (or trimers) of blocks, it is possible to approach…

cond-mat.soft2004★ 8 cited

The thermal Casimir effect in lipid bilayer tubules

D. S. Dean, R. R. Horgan

We calculate the thermal Casimir effect for a dielectric tube of radius and thickness delta formed from a membrane in water. The method uses a field-theoretic approach in the g…