205 research outputs found
Deficiency of CCAAT/enhancer binding protein-epsilon reduces atherosclerotic lesions in LDLR-/- Mice
10.1371/journal.pone.0085341PLoS ONE91-POLN
Insulator-Superfluid transition of spin-1 bosons in an optical lattice in magnetic field
We study the insulator-superfluid transition of spin-1 bosons in an optical
lattice in a uniform magnetic field. Based on a mean-field approximation we
obtained a zero-temperature phase diagram. We found that depending on the
particle number the transition for bosons with antiferromagnetic interaction
may occur into different superfluid phases with spins aligned along or opposite
to the field direction. This is qualitatively different from the field-free
transition for which the mean-field theory predicts a unique (polar) superfluid
state for any particle number.Comment: 10 pages, 2 eps figure
A simple derivation of level spacing of quasinormal frequencies for a black hole with a deficit solid angle and quintessence-like matter
In this paper, we investigate analytically the level space of the imaginary
part of quasinormal frequencies for a black hole with a deficit solid angle and
quintessence-like matter by the Padmanabhan's method \cite{Padmanabhan}.
Padmanabhan presented a method to study analytically the imaginary part of
quasinormal frequencies for a class of spherically symmetric spacetimes
including Schwarzschild-de Sitter black holes which has an evenly spaced
structure. The results show that the level space of scalar and gravitational
quasinormal frequencies for this kind of black holes only depend on the surface
gravity of black-hole horizon in the range of -1 < w < -1/3, respectively . We
also extend the range of to , the results of which are similar
to that in -1 < w < -1/3 case. Particularly, a black hole with a deficit solid
angle in accelerating universe will be a Schwarzschild-de Sitter black hole,
fixing and . And a black hole with a deficit solid
angle in the accelerating universe will be a Schwarzschild black hole,when
and . In this paper, is the parameter of state
equation, is a parameter relating to a deficit solid angle and
is the density of static spherically symmetrical quintessence-like
matter at .Comment: 6 pages, Accepted for publication in Astrophysics & Space Scienc
Development and validation of measures to study the effects of the built environment on walking in Hong Kong older adults
Conference Theme: Age-friendly Cities with Cooperation & Participatio
Resonances in the three-neutron system
A study of 3-body resonances has been performed in the framework of
configuration space Faddeev equations. The importance of keeping a sufficient
number of terms in the asymptotic expansion of the resonance wave function is
pointed out. We investigated three neutrons interacting in selected force
components taken from realistic nn forces.Comment: 38 pages, 11 tables, 4 figure
Contribution of Color Information in Visual Saliency Model for Videos
International audienceMuch research has been concerned with the contribution of the low level features of a visual scene to the deployment of visual attention. Bottom-up saliency models have been developed to predict the location of gaze according to these features. So far, color besides to brightness, contrast and motion is considered as one of the primary features in computing bottom-up saliency. However, its contribution in guiding eye movements when viewing natural scenes has been debated. We investigated the contribution of color information in a bottom-up visual saliency model. The model efficiency was tested using the experimental data obtained on 45 observers who were eye tracked while freely exploring a large data set of color and grayscale videos. The two datasets of recorded eye positions, for grayscale and color videos, were compared with a luminance-based saliency model. We incorporated chrominance information to the model. Results show that color information improves the performance of the saliency model in predicting eye positions
Severe acute respiratory syndrome coronavirus protein 7a interacts with hSGT
Severe acute respiratory syndrome coronavirus (SARS-CoV) 7a is an accessory protein with no known homologues. In this study, we
report the interaction of a SARS-CoV 7a and small glutamine-rich tetratricopeptide repeat-containing protein (SGT). SARS-CoV 7a and
human SGT interaction was identified using a two-hybrid system screen and confirmed with interaction screens in cell culture and cellular
co-localization studies. The SGT domain of interaction was mapped by deletion mutant analysis and results indicated that tetratricopeptide
repeat 2 (aa 125-158) was essential for interaction. We also showed that 7a interacted with SARS-CoV structural proteins M (membrane)
and E (envelope), which have been shown to be essential for virus-like particle formation. Taken together, our results coupled
with data from studies of the interaction between SGT and HIV-1 vpu indicated that SGT could be involved in the life-cycle, possibly
assembly of SARS-CoV.IS
Deep exclusive electroproduction off the proton at CLAS
The exclusive electroproduction of above the resonance region was
studied using the Large Acceptance Spectrometer () at
Jefferson Laboratory by scattering a 6 GeV continuous electron beam off a
hydrogen target. The large acceptance and good resolution of ,
together with the high luminosity, allowed us to measure the cross section for
the process in 140 (, , ) bins:
, 1.6 GeV GeV and 0.1 GeV
GeV. For most bins, the statistical accuracy is on the order of a few
percent. Differential cross sections are compared to two theoretical models,
based either on hadronic (Regge phenomenology) or on partonic (handbag diagram)
degrees of freedom. Both can describe the gross features of the data reasonably
well, but differ strongly in their ingredients. If the handbag approach can be
validated in this kinematical region, our data contain the interesting
potential to experimentally access transversity Generalized Parton
Distributions.Comment: 18pages, 21figures,2table
Green function techniques in the treatment of quantum transport at the molecular scale
The theoretical investigation of charge (and spin) transport at nanometer
length scales requires the use of advanced and powerful techniques able to deal
with the dynamical properties of the relevant physical systems, to explicitly
include out-of-equilibrium situations typical for electrical/heat transport as
well as to take into account interaction effects in a systematic way.
Equilibrium Green function techniques and their extension to non-equilibrium
situations via the Keldysh formalism build one of the pillars of current
state-of-the-art approaches to quantum transport which have been implemented in
both model Hamiltonian formulations and first-principle methodologies. We offer
a tutorial overview of the applications of Green functions to deal with some
fundamental aspects of charge transport at the nanoscale, mainly focusing on
applications to model Hamiltonian formulations.Comment: Tutorial review, LaTeX, 129 pages, 41 figures, 300 references,
submitted to Springer series "Lecture Notes in Physics
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