98,568 research outputs found
Thermometry of ultracold atoms via non-equilibrium work distributions
Estimating the temperature of a cold quantum system is difficult. Usually,
one measures a well-understood thermal state and uses that prior knowledge to
infer its temperature. In contrast, we introduce a method of thermometry that
assumes minimal knowledge of the state of a system and is potentially
non-destructive. Our method uses a universal temperature-dependence of the
quench dynamics of an initially thermal system coupled to a qubit probe that
follows from the Tasaki-Crooks theorem for non-equilibrium work distributions.
We provide examples for a cold-atom system, in which our thermometry protocol
may retain accuracy and precision at subnanokelvin temperatures.Comment: Updated to published version. 6 pages plus 11 pages of supplemental
material, and some numerical dat
Minimization of Illness Absenteeism in Primary School Students Using Low-Cost Hygiene Interventions
Objective: Safe water and hygiene intervention was evaluated to assess its impact on students’ health, hygiene practices and reduction in illness absenteeism in primary school students. Method: After evaluatingprimary schools of Amravati district; 50 students with high enteric illness absenteeism were selected for study. Families with problem of in-house water contamination were provided earthen pot with tap for water storage and soap for hand washing at school and home. Household drinking waters (before and after intervention) were analyzed for potability. Results: By adopting correct water storage (water container with tap), handling and hand washing practices found to improve health and reduction in 20% illness absenteeism in school. Promoting these interventions and improvement in water-behavioral practices prevented in-house-water contamination. Conclusion: These low cost intervention (water storage container with tap) promises to reducing school absenteeism by minimizing risk of transmission of enteric infections by promoting water and student hygiene
Algorithms for Visualizing Phylogenetic Networks
We study the problem of visualizing phylogenetic networks, which are
extensions of the Tree of Life in biology. We use a space filling visualization
method, called DAGmaps, in order to obtain clear visualizations using limited
space. In this paper, we restrict our attention to galled trees and galled
networks and present linear time algorithms for visualizing them as DAGmaps.Comment: Appears in the Proceedings of the 24th International Symposium on
Graph Drawing and Network Visualization (GD 2016
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Moment properties of estimators for a type 1 extreme value regression model
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CD28-induced costimulation of T helper type 2 cells mediated by induction of responsiveness to interleukin 4.
Type 1 and type 2 cloned T helper (Th) cells are believed to require different antigen-presenting cell (APC)-derived costimuli for proliferation. In the case of Th1-cloned T cells, CD28 signaling costimulates production of autocrine interleukin 2 (IL-2). Th2 cells produce their autocrine growth factor, IL-4, without costimulation, but require APC-derived costimuli, or IL-1, to respond to IL-4. Here we demonstrate that engagement of CD28 on Th2 cells with anti-CD28 antibody or with APC-associated B7 costimulates Th2 responsiveness to IL-4 but does not affect IL-4 or IL-2 production by Th2 cells. Costimulation of Th2 cells via CD28 appears to involve the induction of IL-1 production by Th2 cells, which acts in an autocrine fashion to induce IL-4 responsiveness. These results suggest that CD28-induced costimulation plays an important role in responses mediated by both types of Th cells
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Moment properties of estimators for an extreme value regression model with type 2 censoring
An extreme value regression model for grouped data with type 2
censoring is considered. The response variable is taken to have a
type 1 ext reme va lue d i s t r i b u t i on for sma l l e s t v a l ue s a nd a s tandar d
linear regression model is assumed f o r t he means . Large sampl e
approximations to the variances of the maximum likelihood estimators
are derived. The small sample moment properties of the maximum
likelihood estimators are evaluated by simulation for the case of
simp l e l i n e a r r e g ress i o n . T h e r e sul t s s h o w t h a t t h e e stima t or o f
the scale parameter has a s t rong bias in sma l l samples, particularly
when ther e is a heavy degree of censoring. Final l y , sma l l sample
variance and mean square error efficiences of the best linear unbiased
estimators relative to the maximum likelihood estimators are assessed
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Properties of statistical inference procedures for a gamma regression model
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