17,515 research outputs found
Guide to Creative Commons for humanities and social science monograph authors
A booklet for authors in the humanities and social sciences specifically designed to help them understand the Creative Commons licenses
Sustained Magnetorotational Turbulence in Local Simulations of Stratified Disks with Zero Net Magnetic Flux
We examine the effects of density stratification on magnetohydrodynamic
turbulence driven by the magnetorotational instability in local simulations
that adopt the shearing box approximation. Our primary result is that, even in
the absence of explicit dissipation, the addition of vertical gravity leads to
convergence in the turbulent energy densities and stresses as the resolution
increases, contrary to results for zero net flux, unstratified boxes. The ratio
of total stress to midplane pressure has a mean of ~0.01, although there can be
significant fluctuations on long (>~50 orbit) timescales. We find that the time
averaged stresses are largely insensitive to both the radial or vertical aspect
ratio of our simulation domain. For simulations with explicit dissipation, we
find that stratification extends the range of Reynolds and magnetic Prandtl
numbers for which turbulence is sustained. Confirming the results of previous
studies, we find oscillations in the large scale toroidal field with periods of
~10 orbits and describe the dynamo process that underlies these cycles.Comment: 13 pages, 18 figures, submitted to Ap
University of Huddersfield Report on expenditure and compliance with the RCUK Policy on Open Access 2013-14
This is a report on the expenditure and compliance with the RCUK Open Access Policy
between 1st April 2013 and 31st July 2014 for the University of Huddersfield. It covers the
activities we’ve undertaken during that period and touches on some of our plans for the
future
ELDEN: Exploration via Local Dependencies
Tasks with large state space and sparse rewards present a longstanding
challenge to reinforcement learning. In these tasks, an agent needs to explore
the state space efficiently until it finds a reward. To deal with this problem,
the community has proposed to augment the reward function with intrinsic
reward, a bonus signal that encourages the agent to visit interesting states.
In this work, we propose a new way of defining interesting states for
environments with factored state spaces and complex chained dependencies, where
an agent's actions may change the value of one entity that, in order, may
affect the value of another entity. Our insight is that, in these environments,
interesting states for exploration are states where the agent is uncertain
whether (as opposed to how) entities such as the agent or objects have some
influence on each other. We present ELDEN, Exploration via Local DepENdencies,
a novel intrinsic reward that encourages the discovery of new interactions
between entities. ELDEN utilizes a novel scheme -- the partial derivative of
the learned dynamics to model the local dependencies between entities
accurately and computationally efficiently. The uncertainty of the predicted
dependencies is then used as an intrinsic reward to encourage exploration
toward new interactions. We evaluate the performance of ELDEN on four different
domains with complex dependencies, ranging from 2D grid worlds to 3D robotic
tasks. In all domains, ELDEN correctly identifies local dependencies and learns
successful policies, significantly outperforming previous state-of-the-art
exploration methods.Comment: Accepted to NeurIPS 202
Two By Two
Two by Two, a musical based on Noah\u27s ark, was performed at John Carroll University\u27s Little Theatre in April of 1985.
A notice of the production appeared on page 5 of The Carroll News, April 10, 1985
.https://collected.jcu.edu/plays/1098/thumbnail.jp
States of consciousness: performing sensory perceptions
This conference discussion paper outlines the potential impacts of our emerging scientific understanding of the breadth of human (and non-human) sensory perceptions on the future of theatrical performance. We examine how sensory perspectives may be taught and learned by performers and audiences
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Prevalence and predictors of overweight and obesity among Cameroonian women in a national survey and relationships with waist circumference and inflammation in Yaoundé and Douala.
Information on the distribution and predictors of obesity in Africa is needed to identify populations at risk and explore intervention options. Our objectives were to (a) examine the prevalence and geographic distribution of overweight and obesity among Cameroonian women; (b) evaluate change in anthropometric indicators among urban women between 2009 and 2012; (c) examine associations between household and individual characteristics and overweight and obesity; and (d) examine relationships between body mass index (BMI), abdominal obesity, and inflammation. We analysed data from a nationally representative survey conducted in 3 geographic strata (North, South, and Yaoundé/Douala) in Cameroon in 2009 and a survey in Yaoundé/Douala in 2012. Participants selected for this analysis were nonpregnant women, ages 15-49 years (n = 704 in 2009; n = 243 in 2012). In 2009, ~8% of women were underweight (BMI < 18.5) and 32% overweight or obese (BMI ≥ 25.0). Underweight was most common in the North (19%) and overweight and obesity in the South (40%) and Yaoundé/Douala (49%). Prevalence of BMI ≥ 25.0 in Yaoundé/Douala did not differ in 2012 compared with 2009 (55.5% vs. 48.7%; P = 0.16). Residence in urban areas, greater maternal age, and TV ownership were independently related to overweight and obesity in national and stratified analyses. In Yaoundé/Douala in 2012, 48% (waist-to-hip ratio > 0.85) to 73% (waist circumference > 80 cm) had abdominal obesity. Body mass index was positively associated with abdominal obesity and inflammation. Though causal inferences cannot be drawn, these findings indicate population subgroups at greatest risk for overweight and associated health consequences in Cameroon
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