1,153 research outputs found
Anderson localization of elementary excitations in a one dimensional Bose-Einstein condensate
We study the elementary excitations of a transversely confined Bose-Einstein
condensate in presence of a weak axial random potential. We determine the
localization length (i) in the hydrodynamical low energy regime, for a domain
of linear densities ranging from the Tonks-Girardeau to the transverse
Thomas-Fermi regime, in the case of a white noise potential and (ii) for all
the range of energies, in the ``one-dimensional mean field regime'', in the
case where the randomness is induced by a series of randomly placed point-like
impurities. We discuss our results in view of recent experiments in elongated
BEC systems.Comment: 11 pages, 6 figures. Final printed versio
ATM Locator
In this paper, we focus on an automated teller machineintegrated with ATM locator device. When particular ATM is not working it helps you to find the closest ATMs that can provide surcharge free cash withdrawals for your Money Pass network card. It also finds the direction to nearby ATMs using built in GPS (global positioning system). The GPS will give you the accurate location of your nearby ATMs. Since no ATM had this option if we implement this it will benefit the card holders and customer satisfaction level will be increased
Coulomb parameters and photoemission for the molecular metal TTF-TCNQ
We employ density-functional theory to calculate realistic parameters for an
extended Hubbard model of the molecular metal TTF-TCNQ. Considering both intra-
and intermolecular screening in the crystal, we find significant longer-range
Coulomb interactions along the molecular stacks, as well as inter-stack
coupling. We show that the long-range Coulomb term of the extended Hubbard
model leads to a broadening of the spectral density, likely resolving the
problems with the interpretation of photoemission experiments using a simple
Hubbard model only.Comment: 4 pages, 2 figure
Coupled atomic-molecular condensates in a double-well potential: decaying molecular oscillations
We present a four-mode model that describes coherent photo-association (PA)
in a double-well Bose-Einstein condensate, focusing on the molecular
populations in certain parameters. Our numerical results predict an interesting
strong-damping effect of molecular oscillations by controlling the particle
tunnellings and PA light strength, which may provide a promising way for
creating a stable molecular condensate via coherent PA in a magnetic
double-well potential.Comment: 6 pages, 4 figures, submitte
Generic theory of active polar gels: a paradigm for cytoskeletal dynamics
We develop a general theory for active viscoelastic materials made of polar
filaments. This theory is motivated by the dynamics of the cytoskeleton. The
continuous consumption of a fuel generates a non equilibrium state
characterized by the generation of flows and stresses. Our theory can be
applied to experiments in which cytoskeletal patterns are set in motion by
active processes such as those which are at work in cells.Comment: 28 pages, 2 figure
Report from the Secretary of War, transmitting, in obedience to the act of June 30, 1834, a statement of all persons employed in the service of the Indian Department during the year 1838
346 H.doc.4925-3Report on Persons Employed in the Indian Dept. [339] For the year 1838.1839-3
Structures of the , mesons and the strong coupling constants , with the light-cone QCD sum rules
In this article, with the assumption of explicit isospin violation arising
from the mixing, we take the point of view that the scalar
mesons and have both strange and non-strange
quark-antiquark components and evaluate the strong coupling constants and within the framework of the light-cone QCD sum
rules approach. The large strong scalar- couplings through both the
and components ,
,
and will support the
hadronic dressing mechanism, furthermore, in spite of the constituent structure
differences between the and mesons, the strange
components have larger strong coupling constants with the state than
the corresponding non-strange ones, and . From the existing controversial values,
we can not reach a general consensus on the strong coupling constants , and the mixing angles.Comment: 14 pages; Revised versio
The phase of the sigma -> pi-pi amplitude in J/Psi -> omega-pi-pi
The phase variation of the sigma -> pi-pi amplitude is accurately determined
as a function of mass from BES II data for J/Psi -> omega-pi-pi. The
determination arises from interference with the strong b1(1235)-pi amplitude.
The observed phase variation agrees within errors with that in pi-pi elastic
scattering.Comment: 10 pages, 4 figures, Euro. Phys. J C (in press
Ground State Properties of an Asymmetric Hubbard Model for Unbalanced Ultracold Fermionic Quantum Gases
In order to describe unbalanced ultracold fermionic quantum gases on optical
lattices in a harmonic trap, we investigate an attractive () asymmetric
() Hubbard model with a Zeeman-like magnetic
field. In view of the model's spatial inhomogeneity, we focus in this paper on
the solution at Hartree-Fock level. The Hartree-Fock Hamiltonian is
diagonalized with particular emphasis on superfluid phases. For the special
case of spin-independent hopping we analytically determine the number of
solutions of the resulting self-consistency equations and the nature of the
possible ground states at weak coupling. Numerical results for unbalanced
Fermi-mixtures are presented within the local density approximation. In
particular, we find a fascinating shell structure, involving normal and
superfluid phases. For the general case of spin-dependent hopping we calculate
the density of states and the possible superfluid phases in the ground state.
In particular, we find a new magnetized superfluid phase.Comment: 9 pages, 5 figure
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