15,792 research outputs found
Thermodynamics of pairing transition in hot nuclei
The pairing correlations in hot nuclei Dy are investigated in terms
of the thermodynamical properties by covariant density functional theory. The
heat capacities are evaluated in the canonical ensemble theory and the
paring correlations are treated by a shell-model-like approach, in which the
particle number is conserved exactly. A S-shaped heat capacity curve, which
agrees qualitatively with the experimental data, has been obtained and analyzed
in details. It is found that the one-pair-broken states play crucial roles in
the appearance of the S shape of the heat capacity curve. Moreover, due to the
effect of the particle-number conservation, the pairing gap varies smoothly
with the temperature, which indicates a gradual transition from the superfluid
to the normal state.Comment: 13 pages, 4 figure
Deformation effect on the center-of-mass correction energy in nuclei ranging from Oxygen to Calcium
The microscopic center-of-mass (c.m.) correction energies for nuclei ranging
from Oxygen to Calcium are systematically calculated by both spherical and
axially deformed relativistic mean-field (RMF) models with the effective
interaction PK1. The microscopic c.m. correction energies strongly depend on
the isospin as well as deformation and deviate from the phenomenological ones.
The deformation effect is discussed in detail by comparing the deformed with
the spherical RMF calculation. It is found that the direct and exchange terms
of the c.m. correction energies are strongly correlated with the density
distribution of nuclei and are suppressed in the deformed case.Comment: 7 pages, 3 figures, accepted by Chin.Phys.Let
Deformation effect on the center-of-mass correction energy in nuclei ranging from Oxygen to Calcium
The microscopic center-of-mass (c.m.) correction energies for nuclei ranging
from Oxygen to Calcium are systematically calculated by both spherical and
axially deformed relativistic mean-field (RMF) models with the effective
interaction PK1. The microscopic c.m. correction energies strongly depend on
the isospin as well as deformation and deviate from the phenomenological ones.
The deformation effect is discussed in detail by comparing the deformed with
the spherical RMF calculation. It is found that the direct and exchange terms
of the c.m. correction energies are strongly correlated with the density
distribution of nuclei and are suppressed in the deformed case.Comment: 7 pages, 3 figures, accepted by Chin.Phys.Let
Occlusion Aware Unsupervised Learning of Optical Flow
It has been recently shown that a convolutional neural network can learn
optical flow estimation with unsupervised learning. However, the performance of
the unsupervised methods still has a relatively large gap compared to its
supervised counterpart. Occlusion and large motion are some of the major
factors that limit the current unsupervised learning of optical flow methods.
In this work we introduce a new method which models occlusion explicitly and a
new warping way that facilitates the learning of large motion. Our method shows
promising results on Flying Chairs, MPI-Sintel and KITTI benchmark datasets.
Especially on KITTI dataset where abundant unlabeled samples exist, our
unsupervised method outperforms its counterpart trained with supervised
learning.Comment: CVPR 2018 Camera-read
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