111 research outputs found
Fate of spin polarization in a relativistic fluid: An entropy-current analysis
We derive relativistic hydrodynamic equations with a dynamical spin degree of
freedom on the basis of an entropy-current analysis. The first and second laws
of local thermodynamics constrain possible structures of the constitutive
relations including a spin current and the antisymmetric part of the
(canonical) energy-momentum tensor. Solving the obtained hydrodynamic equations
within the linear-mode analysis, we find spin-diffusion modes, indicating that
spin density is damped out after a characteristic time scale controlled by
transport coefficients introduced in the antisymmetric part of the
energy-momentum tensor in the entropy-current analysis. This is a consequence
of mutual convertibility between spin and orbital angular momentum.Comment: 7 page
Cooperation of DNA-PKcs and WRN helicase in the maintenance of telomeric D-loops
Werner syndrome
is an inherited human progeriod syndrome caused by mutations in the gene
encoding the Werner Syndrome protein, WRN. It has both 3'-5' DNA
helicase and exonuclease activities, and is
suggested to have roles in many aspects of DNA metabolism, including DNA
repair and telomere maintenance. The DNA-PK complex also functions in both
DNA double strand break repair and telomere maintenance. Interaction
between WRN and the DNA-PK complex has been reported in DNA double strand
break repair, but their possible cooperation at telomeres has not been
reported. This study analyzes thein vitro and in vivo
interaction at the telomere between WRN and DNA-PKcs, the catalytic subunit
of DNA-PK. The results show that DNA-PKcs selectively stimulates WRN
helicase but not WRN exonuclease in vitro, affecting that WRN
helicase unwinds and promotes the release of the full-length invading strand
of a telomere D-loop model substrate. In addition, the length of telomeric
G-tails decreases in DNA-PKcs knockdown cells, and this phenotype is
reversed by overexpression of WRN helicase. These results suggest that WRN
and DNA-PKcs may cooperatively prevent G-tail shortening in vivo
Heisenberg realization for U_q(sln) on the flag manifold
We give the Heisenberg realization for the quantum algebra , which
is written by the -difference operator on the flag manifold. We construct it
from the action of on the -symmetric algebra by the
Borel-Weil like approach. Our realization is applicable to the construction of
the free field realization for the [AOS].Comment: 10 pages, YITP/K-1016, plain TEX (some mistakes corrected and a
reference added
Development of pericardial fat count images using a combination of three different deep-learning models
Rationale and Objectives: Pericardial fat (PF), the thoracic visceral fat
surrounding the heart, promotes the development of coronary artery disease by
inducing inflammation of the coronary arteries. For evaluating PF, this study
aimed to generate pericardial fat count images (PFCIs) from chest radiographs
(CXRs) using a dedicated deep-learning model.
Materials and Methods: The data of 269 consecutive patients who underwent
coronary computed tomography (CT) were reviewed. Patients with metal implants,
pleural effusion, history of thoracic surgery, or that of malignancy were
excluded. Thus, the data of 191 patients were used. PFCIs were generated from
the projection of three-dimensional CT images, where fat accumulation was
represented by a high pixel value. Three different deep-learning models,
including CycleGAN, were combined in the proposed method to generate PFCIs from
CXRs. A single CycleGAN-based model was used to generate PFCIs from CXRs for
comparison with the proposed method. To evaluate the image quality of the
generated PFCIs, structural similarity index measure (SSIM), mean squared error
(MSE), and mean absolute error (MAE) of (i) the PFCI generated using the
proposed method and (ii) the PFCI generated using the single model were
compared.
Results: The mean SSIM, MSE, and MAE were as follows: 0.856, 0.0128, and
0.0357, respectively, for the proposed model; and 0.762, 0.0198, and 0.0504,
respectively, for the single CycleGAN-based model.
Conclusion: PFCIs generated from CXRs with the proposed model showed better
performance than those with the single model. PFCI evaluation without CT may be
possible with the proposed method
Excited States of Calogero-Sutherland Model and Singular Vectors of the Algebra
Using the collective field method, we find a relation between the Jack
symmetric polynomials, which describe the excited states of the
Calogero-Sutherland model, and the singular vectors of the algebra. Based
on this relation, we obtain their integral representations. We also give a
direct algebraic method which leads to the same result, and integral
representations of the skew-Jack polynomials.Comment: LaTeX, 29 pages, 2 figures, New sections for skew-Jack polynomial and
example of singular vectors adde
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