11,787 research outputs found
Nucleon Spin Structures from Lattice QCD: Flavor Singlet Axial and Tensor Charges
The flavor singlet axial and tensor charges of the nucleon are calculated in
lattice QCD. We find for the axial charge and
for the tensor charge. The result for the axial charge shows
reasonable agreement with the experiment and that for the tensor charge is the
first prediction from lattice QCD before experimental measurements.Comment: 10 pages, latex source-file, 5 figures as epsf-file, uses
espcrc1.sty. Invited talk at the International Conference on Quark Lepton
Nuclear Physics, 20-23 May 1997, Osaka, Japa
Understanding the Formation and Effects of General Self Effocacy in Business Students
The aim of this study is to investigate the formation and effects of general computer self-efficacy among business students. Antecedents of computer self-efficacy were investigated, and computer attitudes and MIS intention (defined as one’s intention to select MIS for his or her future study and career) were selected as dependent variables. The results supported that computer knowledge, current computing experiences, computer anxiety, and age affected the formation and development of computer self-efficacy among the sampled students; computer self-efficacy and social norms had strong effects on computer attitudes and MIS intention. Implications for both research and MIS education are also discussed
Superpixel Convolutional Networks using Bilateral Inceptions
In this paper we propose a CNN architecture for semantic image segmentation.
We introduce a new 'bilateral inception' module that can be inserted in
existing CNN architectures and performs bilateral filtering, at multiple
feature-scales, between superpixels in an image. The feature spaces for
bilateral filtering and other parameters of the module are learned end-to-end
using standard backpropagation techniques. The bilateral inception module
addresses two issues that arise with general CNN segmentation architectures.
First, this module propagates information between (super) pixels while
respecting image edges, thus using the structured information of the problem
for improved results. Second, the layer recovers a full resolution segmentation
result from the lower resolution solution of a CNN. In the experiments, we
modify several existing CNN architectures by inserting our inception module
between the last CNN (1x1 convolution) layers. Empirical results on three
different datasets show reliable improvements not only in comparison to the
baseline networks, but also in comparison to several dense-pixel prediction
techniques such as CRFs, while being competitive in time.Comment: European Conference on Computer Vision (ECCV), 201
Di-hadron azimuthal correlation and Mach-like cone structure in parton/hadron transport model
In the framework of a multi-phase transport model (AMPT) with both partonic
and hadronic interactions, azimuthal correlations between trigger particles and
associated scattering particles have been studied by the mixing-event
technique. The momentum ranges of these particles are
GeV/ and GeV/ (soft), or 4
GeV/ and GeV/ (hard) in Au + Au collisions at
= 200 GeV. A Mach-like structure has been observed in
correlation functions for central collisions. By comparing scenarios with and
without parton cascade and hadronic rescattering, we show that both partonic
and hadronic dynamical mechanisms contribute to the Mach-like structure of the
associated particle azimuthal correlations. The contribution of hadronic
dynamical process can not be ignored in the emergence of Mach-like correlations
of the soft scattered associated hadrons. However, hadronic rescattering alone
cannot reproduce experimental amplitude of Mach-like cone on away-side, and the
parton cascade process is essential to describe experimental amplitude of
Mach-like cone on away-side. In addition, both the associated multiplicity and
the sum of decrease, whileas the increases, with the impact
parameter in the AMPT model including partonic dynamics from string melting
scenario.Comment: 9 pages, 5 figures; Physics Letters B 641, 362-367 (2006
Chiral-odd transversity spin structure function of the nucleon in a constituent quark model
We study the chiral-odd transversity spin-dependent quark distribution
function of the nucleon in a constituent quark model. The twist-2
structure functions, , and are calculated within the
diquark spectator approximation. Whereas an inequality holds with the interaction between quark and diquark being scalar, the
axial-vector effective quark-diquark interaction, which contributes to the
-quark distribution, does not lead to such a simple relation. We find that
for the -quark becomes somewhat smaller than , when we
fix the model parameter to reproduce known other structure functions. We also
include corrections due to the non-trivial structure of the constituent quark,
which is modeled by the Goldstone boson dressing. This improves agreements of
and with experiments, and brings further reduction of
distribution. Consequences for semi-inclusive experiments are also
discussed.Comment: 33 pages, latex with 13 figures, to appear in Nuclear Physics A,
PostScript file is also available at
http://WWW.physik.tu-muenchen.de/~ksuzuki/publication.htm
Global Strong solution with vacuum to the 2D nonhomogeneous incompressible MHD system
In this paper, we first prove the unique global strong solution with vacuum
to the two dimensional nonhomogeneous incompressible MHD system, as long as the
initial data satisfies some compatibility condition. As a corollary, the global
existence of strong solution with vacuum to the 2D nonhomogeneous
incompressible Navier-Stokes equations is also established. Our main result
improves all the previous results where the initial density need to be strictly
positive. The key idea is to use some critical Sobolev inequality of
logarithmic type, which is originally due to Brezis-Wainger.Comment: 16 page
Comments on the Fate of unstable orbifolds
We study the localized tachyon condensation in their mirror Landau-Ginzburg
picture. We completely determine the decay mode of an unstable orbifold
, under the condensation of a tachyon with definite R-charge
and mass by extending the Vafa's work hep-th/0111105. Here, we give a simple
method that works uniformly for all . For , where method of
toric geometry works, we give a proof of equivalence of our method with toric
one. For cases, the orbifolds decay into sum of far separated
orbifolds.Comment: 14 page, 2 figure
On the degrees of freedom of lattice electrodynamics
Using Euler's formula for a network of polygons for 2D case (or polyhedra for
3D case), we show that the number of dynamic\textit{\}degrees of freedom of the
electric field equals the number of dynamic degrees of freedom of the magnetic
field for electrodynamics formulated on a lattice. Instrumental to this
identity is the use (at least implicitly) of a dual lattice and of a (spatial)
geometric discretization scheme based on discrete differential forms. As a
by-product, this analysis also unveils a physical interpretation for Euler's
formula and a geometric interpretation for the Hodge decomposition.Comment: 14 pages, 6 figure
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