3,287 research outputs found
Latent Degradation Representation Constraint for Single Image Deraining
Since rain streaks show a variety of shapes and directions, learning the
degradation representation is extremely challenging for single image deraining.
Existing methods are mainly targeted at designing complicated modules to
implicitly learn latent degradation representation from coupled rainy images.
This way, it is hard to decouple the content-independent degradation
representation due to the lack of explicit constraint, resulting in over- or
under-enhancement problems. To tackle this issue, we propose a novel Latent
Degradation Representation Constraint Network (LDRCNet) that consists of
Direction-Aware Encoder (DAEncoder), UNet Deraining Network, and Multi-Scale
Interaction Block (MSIBlock). Specifically, the DAEncoder is proposed to
adaptively extract latent degradation representation by using the deformable
convolutions to exploit the direction consistency of rain streaks. Next, a
constraint loss is introduced to explicitly constraint the degradation
representation learning during training. Last, we propose an MSIBlock to fuse
with the learned degradation representation and decoder features of the
deraining network for adaptive information interaction, which enables the
deraining network to remove various complicated rainy patterns and reconstruct
image details. Experimental results on synthetic and real datasets demonstrate
that our method achieves new state-of-the-art performance
Measuring deformed neutron skin with free spectator nucleons in relativistic heavy-ion collisions
The neutron skin in deformed nuclei is generally not uniformly distributed
but has an angular distribution, depending on both the spin-dependent nuclear
interaction and the nuclear symmetry energy. To extract the information of the
deformed neutron skin, we have explored the possibility of using free spectator
nucleons in central tip-tip and body-body collisions at top RHIC energy with
four typical deformed nuclei. The density distributions of neutrons and protons
are consistently obtained from the Skyrme-Hartree-Fock-Bogolyubov calculation,
and the angular distribution of the neutron skin can be varied by adjusting the
strength of the nuclear spin-orbit coupling. With the information of spectator
nucleons obtained based on a Monte-Carlo Glauber model, the free spectator
nucleons are generated from a multifragmentation process. By investigating the
results from different systems and with different collision configurations, we
found that although it is difficult to probe the deformed neutron skin in
Zr and U by their collisions, it is promising to extract the
polar angular distributions of the neutron skin in Ru and Au by
comparing the yield ratios of free spectator neutrons to protons in their
central tip-tip and body-body collisions. The proposed observables can be
measured by dedicated zero-degree calorimeters in heavy-ion collision
experiments that have been carried out in recent years by RHIC.Comment: 7 pages, 6 figure
Collision geometry effect on free spectator nucleons in relativistic heavy-ion collisions
Based on the deformed nucleon distributions obtained from the constrained
Skyrme-Hartree-Fock-Bogolyubov calculation using different nuclear symmetry
energies, we have investigated the effects of the neutron skin and the
collision geometry on the yield of free spectator nucleons as well as the yield
ratio of free spectator neutrons to protons in collisions of deformed
nuclei at RHIC energies. We found that tip-tip (body-body) collisions with
prolate (oblate) nuclei lead to fewest free spectator nucleons, compared to
other collision configurations. While the ratio is sensitive to the
average neutron-skin thickness of colliding nuclei and the symmetry energy, it
is affected by the polar angular distribution of the neutron skin in different
collision configurations. We also found that the collision geometry effect can
be as large as 50% the symmetry energy effect in some collision systems. Due to
the particular deformed neutron skin in U and Zr, the symmetry
energy effect on the ratio is enhanced in tip-tip U+U
collisions and body-body Zr+Zr collisions compared to other
collision orientations in the same collision system. Our study may shed light
on probing deformed neutron skin by selecting desired configurations in
high-energy collisions with deformed nuclei.Comment: 7 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2301.0789
Lifshitz Scaling Effects on Holographic Superconductors
Via numerical and analytical methods, the effects of the Lifshitz dynamical
exponent on holographic superconductors are studied in some detail,
including wave and wave models. Working in the probe limit, we find
that the behaviors of holographic models indeed depend on concrete value of
. We obtain the condensation and conductivity in both Lifshitz black hole
and soliton backgrounds with general . For both wave and wave models
in the black hole backgrounds, as increases, the phase transition becomes
more difficult and the growth of conductivity is suppressed. For the Lifshitz
soliton backgrounds, when increases (), the critical chemical
potential decreases in the wave cases but increases in the wave cases.
For wave models in both Lifshitz black hole and soliton backgrounds, the
anisotropy between the AC conductivity in different spatial directions is
suppressed when increases. The analytical results uphold the numerical
results.Comment: Typos corrected; Footnote added; References added; To be published in
Nuclear Physics
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