9,220 research outputs found
Verification of FLA Action Plan for Russell Corporation
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_Verification_Report_Russell.pdf: 151 downloads, before Oct. 1, 2020
Surveillance of antimalarial drug resistance in China in the 1980s–1990s
Since the successful preparation of the microplates and the medium for field application, the resistance degree and its geographical distribution of chloroquine-resistant Plasmodium falciparum, the fluctuation of the resistance degree of P. falciparum to chloroquine, and the sensitivity of the parasite to commonly used antimalarial drugs were investigated between 1980 and 2003 by the in vitro microtest and the in vivo four-week test recommended by the World Health Organization (WHO). The results indicated that chloroquine-resistant falciparum malaria was present in all eight provinces/autonomous regions endemic for falciparum malaria in China, and the resistance was high and widely distributed in the Hainan and Yunnan provinces. When the use of chloroquine was stopped or administered in a decreased quanity, the drug resistance gradually decreased. In Hainan and Yunnan, P. falciparum was still highly resistant to chloroquine, amodiaquine and piperaquine, and sensitive to pyronaridine and artemisinin derivatives, but the sensitivity was gradually reduced. Based on these results, principles and therapeutic regimens for antimalarial drug use in China were formulated, the use of the antimalarials which had already developed resistance was stopped or reduced, and recommendations to use artemisinin derivatives or compound pyronaridine to promote a rational use of antimalarials and strengthen malaria control were made. The results showed that malaria incidence had declined, and endemic areas of falciparum malaria have been gradually reducing since the mid-1980s
Noise in Genotype Selection Model
We study the steady state properties of a genotype selection model in
presence of correlated Gaussian white noise. The effect of the noise on the
genotype selection model is discussed. It is found that correlated noise can
break the balance of gene selection and induce the phase transition which can
makes us select one type gene haploid from a gene group.Comment: 8 pages, 4 figure
Interplay between Superconductivity and Antiferromagnetism in a Multi-layered System
Based on a microscopic model, we study the interplay between
superconductivity and antiferromagnetism in a multi-layered system, where two
superconductors are separated by an antiferromagnetic region. Within a
self-consistent mean-field theory, this system is solved numerically. We find
that the antiferromagnetism in the middle layers profoundly affects the
supercurrent flowing across the junction, while the phase difference across the
junction influences the development of antiferromagnetism in the middle layers.
This study may not only shed new light on the mechanism for high-
superconductors, but also bring important insights to building
Josephson-junction-based quantum devices, such as SQUID and superconducting
qubit.Comment: 4+ pages, 5 figures, Accepted for publication in Phys. Rev.
Smectic order, pinning, and phase transition in a smectic liquid crystal cell with a random substrate
We study smectic-liquid-crystal order in a cell with a heterogeneous
substrate imposing surface random positional and orientational pinnings.
Proposing a minimal random elastic model, we demonstrate that, for a thick
cell, the smectic state without a rubbed substrate is always unstable at long
scales and, for weak random pinning, is replaced by a smectic glass state. We
compute the statistics of the associated substrate-driven distortions and the
characteristic smectic domain size on the heterogeneous substrate and in the
bulk. We find that for weak disorder, the system exhibits a three-dimensional
temperature-controlled phase transition between a weakly and strongly pinned
smectic glass states akin to the Cardy-Ostlund phase transition. We explore
experimental implications of the predicted phenomenology and suggest that it
provides a plausible explanation for the experimental observations on polarized
light microscopy and x-ray scattering.Comment: 30 pages, 11 figures, Published in PRE, with minor typos correcte
SceneRF: Self-Supervised Monocular 3D Scene Reconstruction with Radiance Fields
3D reconstruction from 2D image was extensively studied, training with depth
supervision. To relax the dependence to costly-acquired datasets, we propose
SceneRF, a self-supervised monocular scene reconstruction method using only
posed image sequences for training. Fueled by the recent progress in neural
radiance fields (NeRF) we optimize a radiance field though with explicit depth
optimization and a novel probabilistic sampling strategy to efficiently handle
large scenes. At inference, a single input image suffices to hallucinate novel
depth views which are fused together to obtain 3D scene reconstruction.
Thorough experiments demonstrate that we outperform all recent baselines for
novel depth views synthesis and scene reconstruction, on indoor BundleFusion
and outdoor SemanticKITTI. Our code is available at
https://astra-vision.github.io/SceneRF.Comment: Project page: https://astra-vision.github.io/SceneR
Stability and distortions of liquid crystal order in a cell with a heterogeneous substrate
We study stability and distortions of liquid crystal nematic order in a cell
with a random heterogeneous substrate. Modeling this system as a bulk xy model
with quenched disorder confined to a surface, we find that nematic order is
marginally unstable to such surface pinning. We compute the length scale beyond
which nematic distortions become large and calculate orientational correlation
functions using the functional renormalization-group and matching methods,
finding universal logarithmic and double-logarithmic distortions in two and
three dimensions, respectively. We extend these results to a finite-thickness
liquid crystal cell with a second homogeneous substrate, detailing crossovers
as a function of random pinning strength and cell thickness. We conclude with
analysis of experimental signatures of these distortions in a conventional
crossed-polarizer-analyzer light microscopy.Comment: 27 pages, 15 figures, Published in PRE, with minor typos correcte
Current Reversals in a inhomogeneous system with asymmetric unbiased fluctuations
We present a study of transport of a Brownian particle moving in periodic
symmetric potential in the presence of asymmetric unbiased fluctuations. The
particle is considered to move in a medium with periodic space dependent
friction. By tuning the parameters of the system, the direction of current
exhibit reversals, both as a function of temperature as well as the amplitude
of rocking force. We found that the mutual interplay between the opposite
driving factors is the necessary term for current reversals.Comment: 9 pages, 7 figure
Generation of potential/surface density pairs in flat disks Power law distributions
We report a simple method to generate potential/surface density pairs in flat
axially symmetric finite size disks. Potential/surface density pairs consist of
a ``homogeneous'' pair (a closed form expression) corresponding to a uniform
disk, and a ``residual'' pair. This residual component is converted into an
infinite series of integrals over the radial extent of the disk. For a certain
class of surface density distributions (like power laws of the radius), this
series is fully analytical. The extraction of the homogeneous pair is
equivalent to a convergence acceleration technique, in a matematical sense. In
the case of power law distributions, the convergence rate of the residual
series is shown to be cubic inside the source. As a consequence, very accurate
potential values are obtained by low order truncation of the series. At zero
order, relative errors on potential values do not exceed a few percent
typically, and scale with the order N of truncation as 1/N**3. This method is
superior to the classical multipole expansion whose very slow convergence is
often critical for most practical applications.Comment: Accepted for publication in Astronomy & Astrophysics 7 pages, 8
figures, F90-code available at
http://www.obs.u-bordeaux1.fr/radio/JMHure/intro2applawd.htm
- …