Analytic calculation of energy transfer and heat flux in a one-dimensional system

In the context of the problem of heat conduction in one-dimensional systems, we present an analytical calculation of the instantaneous energy transfer across a tagged particle in a one-dimensional gas of equal-mass, hard-point particles. From this, we obtain a formula for the steady-state energy flux, and identify and separate the mechanical work and heat conduction contributions to it. The nature of the Fourier law for the model, and the nonlinear dependence of the rate of mechanical work on the stationary drift velocity of the tagged particle, are analyzed and elucidated.Comment: 17 pages including title pag

Predicting in-role and extra-role performance by gender

Men and women are said to perceive justice differently, with women proposed to be more concerned with relational issues and men focused more on material issues. In this study, the potential for differential effects of justice on performance by gender was analyzed across the four contemporary types of justice. Respondents were 265 male and 113 female occupationally diverse employees in a single organization. The results show significant differences in how men and women respond to the four justice types with only one - informational justice - acting similarly by gender. Women were more interested in maintaining social harmony than men. The results appear to strongly support the use of the justice judgment model over the group-value model as a means of explaining the gender differences. Implications for management include the importance of informational justice both generally and within the performance appraisal process<br /

Sources of occupational stress in NSW and ACT dentists

© 2015 Australian Dental Association. Abstract Background This study aimed to identify and understand the chronic sources of work stress in the NSW and ACT dentistry context. Further, the study examines whether Australian dentists are exposed to similar sources of work stress as dentists internationally. Methods A purposive sample of registered members of the NSW Branch of the Australian Dental Association (ADA) were interviewed. Participants were selected because they represented the key characteristics of the broader ADA population. Interviews were recorded and fully transcribed. Themes were identified, developed, refined and clarified using established and rigorous methods of interview investigation and analysis. Results A total of 18 dentists participated in the study. Inductive content analysis was used to develop six main categories of chronic sources of stress. These groupings were time and scheduling pressures, professional concerns, patient/public perceptions of dentists, staffing problems, pressures associated with treating patients and business process stressors. Conclusions Like their international counterparts, Australian dentists are subject to a variety of job-specific stressors. However, the most notable difference between Australian and international dentists relates to the business side of dentistry. It would appear that the Australian statutory, regulatory and industrial relations environment place unique and profound pressures on Australian dentists

Genetic ancestry of participants in the National Children's Study.

BackgroundThe National Children's Study (NCS) is a prospective epidemiological study in the USA tasked with identifying a nationally representative sample of 100,000 children, and following them from their gestation until they are 21 years of age. The objective of the study is to measure environmental and genetic influences on growth, development, and health. Determination of the ancestry of these NCS participants is important for assessing the diversity of study participants and for examining the effect of ancestry on various health outcomes.ResultsWe estimated the genetic ancestry of a convenience sample of 641 parents enrolled at the 7 original NCS Vanguard sites, by analyzing 30,000 markers on exome arrays, using the 1000 Genomes Project superpopulations as reference populations, and compared this with the measures of self-reported ethnicity and race. For 99% of the individuals, self-reported ethnicity and race agreed with the predicted superpopulation. NCS individuals self-reporting as Asian had genetic ancestry of either South Asian or East Asian groups, while those reporting as either Hispanic White or Hispanic Other had similar genetic ancestry. Of the 33 individuals who self-reported as Multiracial or Non-Hispanic Other, 33% matched the South Asian or East Asian groups, while these groups represented only 4.4% of the other reported categories.ConclusionsOur data suggest that self-reported ethnicity and race have some limitations in accurately capturing Hispanic and South Asian populations. Overall, however, our data indicate that despite the complexity of the US population, individuals know their ancestral origins, and that self-reported ethnicity and race is a reliable indicator of genetic ancestry

Calculations of Hubbard U from first-principles

The Hubbard \emph{U} of the \emph{3d} transition metal series as well as SrVO$_{3}$, YTiO$_{3}$, Ce and Gd has been estimated using a recently proposed scheme based on the random-phase approximation. The values obtained are generally in good accord with the values often used in model calculations but for some cases the estimated values are somewhat smaller than those used in the literature. We have also calculated the frequency-dependent \emph{U} for some of the materials. The strong frequency dependence of \emph{U} in some of the cases considered in this paper suggests that the static value of \emph{U} may not be the most appropriate one to use in model calculations. We have also made comparison with the constrained LDA method and found some discrepancies in a number of cases. We emphasize that our scheme and the constrained LDA method theoretically ought to give similar results and the discrepancies may be attributed to technical difficulties in performing calculations based on currently implemented constrained LDA schemes.Comment: 24 pages, 13 figures; Submitted to Phys. Rev.

Reply to comment on "Simple one-dimensional model of heat conduction which obeys Fourier's law"

In this reply we answer the comment by A. Dhar (cond-mat/0203077) on our Letter "Simple one dimensional model of heat conduction which obeys Fourier's law" (Phys. Rev. Lett. 86, 5486 (2001), cond-mat/0104453)Comment: 1 pag., 1 fi