80,981 research outputs found
Osmond Lane Homeowners Association, an unincorporated association v. George C. Landrith, Jr. : Reply Brief
Jacob Edmond. J.-J. Stamm, Le Décalogue à la lumière des recherches contemporaines (Cahiers théologiques, 43), Neuchâtel-Paris, Delachaux et Niestlé, 1959. In: Revue d'histoire et de philosophie religieuses, 41e année n°2,1961. p. 217
Observation of Scaling Violations in Scaled Momentum Distributions at HERA
Charged particle production has been measured in deep inelastic scattering
(DIS) events over a large range of and using the ZEUS detector. The
evolution of the scaled momentum, , with in the range 10 to 1280
, has been investigated in the current fragmentation region of the Breit
frame. The results show clear evidence, in a single experiment, for scaling
violations in scaled momenta as a function of .Comment: 21 pages including 4 figures, to be published in Physics Letters B.
Two references adde
A stochastic model dissects cell states in biological transition processes
Many biological processes, including differentiation, reprogramming, and disease transformations, involve transitions of cells through distinct states. Direct, unbiased investigation of cell states and their transitions is challenging due to several factors, including limitations of single-cell assays. Here we present a stochastic model of cellular transitions that allows underlying single-cell information, including cell-state-specific parameters and rates governing transitions between states, to be estimated from genome-wide, population-averaged time-course data. The key novelty of our approach lies in specifying latent stochastic models at the single-cell level, and then aggregating these models to give a likelihood that links parameters at the single-cell level to observables at the population level. We apply our approach in the context of reprogramming to pluripotency. This yields new insights, including profiles of two intermediate cell states, that are supported by independent single-cell studies. Our model provides a general conceptual framework for the study of cell transitions, including epigenetic transformations
Antibiotic residues and R-plasmid selection: are in vitro methods good models?
Three clones of E. coli, one of which was harbouring a tetracycline resistance plasmid were inoculated together into the stomach of axenic mice. Without antibiotic selective pressure, the R-Plasmid bearing strain became dominant in the faeces of mice, while the R-plasmid free strain was eliminated. When the R-plasmid bearing strain was given to mice 4 days after the inoculation with the R-plasmid free strain, it was repressed and remained at the stable level of 10(4.5) organisms per g of faeces. But a rapid spread of the R-plasmid was observed, tetracycline resistant bacteria become dominant within one day, and replace the tetracycline sensitive E. coli. The tetracycline resistance plasmid did not disadvantage the mediating strain in the gut, even in the absence of antibiotic pressure. In contrast Lebek and Egger (1983), studying the same strains in vitro, found that in a chemostat the plasmid bearing strain was overgrown by the plasmid free strain. These results strongly suggest that in vitro interactions between E. coli strains cannot be directly extrapolated to in vivo conditions. For the determination of the no-effect level of antibiotic residue on the selection of R-factor in the gut, studies should be made in vivo
Kinetic equations for Stark line shapes
The BBGKY formalism is revisited in the framework of plasma spectroscopy. We
address the issue of Stark line shape modeling by using kinetic transport
equations. In the most simplified treatment of these equations, triple
correlations between an emitter and the perturbing charged particles are
neglected and a collisional description of Stark effect is obtained. Here we
relax this assumption and retain triple correlations using a generalization of
the Kirkwood truncature hypothesis to quantum operator. An application to
hydrogen lines is done in the context of plasma diagnostic, and indicates that
the neglect of triple correlations can lead to a significant overestimate of
the line width.Comment: 13 pages, 1 figur
An In-Depth Study on Open-Set Camera Model Identification
Camera model identification refers to the problem of linking a picture to the
camera model used to shoot it. As this might be an enabling factor in different
forensic applications to single out possible suspects (e.g., detecting the
author of child abuse or terrorist propaganda material), many accurate camera
model attribution methods have been developed in the literature. One of their
main drawbacks, however, is the typical closed-set assumption of the problem.
This means that an investigated photograph is always assigned to one camera
model within a set of known ones present during investigation, i.e., training
time, and the fact that the picture can come from a completely unrelated camera
model during actual testing is usually ignored. Under realistic conditions, it
is not possible to assume that every picture under analysis belongs to one of
the available camera models. To deal with this issue, in this paper, we present
the first in-depth study on the possibility of solving the camera model
identification problem in open-set scenarios. Given a photograph, we aim at
detecting whether it comes from one of the known camera models of interest or
from an unknown one. We compare different feature extraction algorithms and
classifiers specially targeting open-set recognition. We also evaluate possible
open-set training protocols that can be applied along with any open-set
classifier, observing that a simple of those alternatives obtains best results.
Thorough testing on independent datasets shows that it is possible to leverage
a recently proposed convolutional neural network as feature extractor paired
with a properly trained open-set classifier aiming at solving the open-set
camera model attribution problem even to small-scale image patches, improving
over state-of-the-art available solutions.Comment: Published through IEEE Access journa
Comparison of some Reduced Representation Approximations
In the field of numerical approximation, specialists considering highly
complex problems have recently proposed various ways to simplify their
underlying problems. In this field, depending on the problem they were tackling
and the community that are at work, different approaches have been developed
with some success and have even gained some maturity, the applications can now
be applied to information analysis or for numerical simulation of PDE's. At
this point, a crossed analysis and effort for understanding the similarities
and the differences between these approaches that found their starting points
in different backgrounds is of interest. It is the purpose of this paper to
contribute to this effort by comparing some constructive reduced
representations of complex functions. We present here in full details the
Adaptive Cross Approximation (ACA) and the Empirical Interpolation Method (EIM)
together with other approaches that enter in the same category
Building a Community Among Early Arab Immigrants in Milwaukee, 1890s–1960s
Like other immigrant groups that came to Wisconsin, most of the late nineteenth and early twentieth century Arab immigrants came to the United States for economic betterment, as well as political and religious freedom. From the start, most immigrants intended to work for a few years and then return to their villages and towns after accumulating some wealth, although that original goal evolved over time as many early immigrants found success in their new country. Most of the community originally settled in a tightly knit community located in the Third Ward area. Over time, the settlement pattern of the Arab community changed as subsequent generations were Americanized
Modeling Nucleation and Growth of Zinc Oxide During Discharge of Primary Zinc-Air Batteries
Metal-air batteries are among the most promising next-generation energy
storage devices. Relying on abundant materials and offering high energy
densities, potential applications lie in the fields of electro-mobility,
portable electronics, and stationary grid applications. Now, research on
secondary zinc-air batteries is revived, which are commercialized as primary
hearing aid batteries. One of the main obstacles for making zinc-air batteries
rechargeable is their poor lifetime due to the degradation of alkaline
electrolyte in contact with atmospheric carbon dioxide. In this article, we
present a continuum theory of a commercial Varta PowerOne button cell. Our
model contains dissolution of zinc and nucleation and growth of zinc oxide in
the anode, thermodynamically consistent electrolyte transport in porous media,
and multi-phase coexistance in the gas diffusion electrode. We perform
electrochemical measurements and validate our model. Excellent agreement
between theory and experiment is found and novel insights into the role of zinc
oxide nucleation and growth and carbon dioxide dissolution for discharge and
lifetime is presented. We demonstrate the implications of our work for the
development of rechargeable zinc-air batteries.Comment: 16 pages, 8 figures, Supplementary Information uploaded as ancillary
fil
An embedded corrector problem to approximate the homogenized coefficients of an elliptic equation
We consider a diffusion equation with highly oscillatory coefficients that
admits a homogenized limit. As an alternative to standard corrector problems,
we introduce here an embedded corrector problem, written as a diffusion
equation in the whole space in which the diffusion matrix is uniform outside
some ball of radius . Using that problem, we next introduce three
approximations of the homogenized coefficients. These approximations, which are
variants of the standard approximations obtained using truncated (supercell)
corrector problems, are shown to converge when . We also discuss
efficient numerical methods to solve the embedded corrector problem
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