Unique Quantum Stress Fields

We have recently developed a geometric formulation of the stress field for an interacting quantum system within the local density approximation (LDA) of density functional theory (DFT). We obtain a stress field which is invariant with respect to choice of energy density. In this paper, we explicitly demonstrate this uniqueness by deriving the stress field for different energy densities. We also explain why particular energy densities give expressions for the stress field that are more tractable than others, thereby lending themselves more easily to first-principles calculations.Comment: To appear in Proceedings for Fundamental Physics of Ferroelectrics (2001

The Interface of Work to Family Conflict and Racioethnic Identification: An Analysis of Hispanic Business Professionals

This article examines work to family conflict for Hispanic Business Professionals with varied levels of Hispanic identity. Based on this study of 971 Hispanics from across the United States, results show that level of Hispanic identity moderates the relationship between work to family conflict and job satisfaction. The authors posit that identification with a culture of collectivism may attenuate the negative impact of work to family conflict on job satisfaction, enabling Hispanic professionals to view work as a way of supporting the family and contributing to the greater good of the groups to which they belong

The Increasing Diversity of America\u27s Youth

This brief documents how unfolding demographic forces have placed today’s children and youth at the forefront of America’s new racial and ethnic diversity. Authors Kenneth M. Johnson, Andrew Schaefer, Daniel T. Lichter, and Luke T. Rogers discuss how the rapidly changing racial and ethnic composition of the youth population has important implications for intergroup relations, ethnic identities, and electoral politics. They report that diversity is increasing among America’s youth because there are more minority children and fewer non-Hispanic white children. Minority births exceeded non-Hispanic white births for the first time in U.S. history in 2011 according to Census Bureau estimates. Both the declining number of non-Hispanic white women of prime child-bearing and growing numbers of minority women contributed to this change as did differential fertility rates. The largest gains in child diversity between 2000 and 2012 were in suburban and smaller metropolitan areas. Yet, child diversity is geographically uneven, with minimal diversity in some areas of the country and significant diversity in other areas. They conclude that natural population increase—particularly fertility rates—will continue to reshape the racial and ethnic mix of the country, and this change will be reflected first among the nation’s youngest residents

\u27Being in\u27 and \u27Feeling seen\u27 in Professional Development as new Teachers: The Ontological Layer(ing) of Professional Development Practice

Dominant discourses on professional development for teachers internationally are increasingly geared to the priority of ensuring individual teachers are meeting prescribed standards-based performance benchmarks which we call ‘performativities’ in this paper. While this intent is invariably played out in individualised performance management meetings and ‘fly by’ professional development workshops, our research into a NZ primary school discovered a counter-movement at work rejecting imposed standards and preoccupations with instrumental performativites and replacing these with teacher co-constructed and contextualised capacity matrices immersed within an ‘open’ and ‘seeing’ professional learning culture of support. Within manifestations of a rich and enabling culture of professional development the ontological nature of professional development within the school offers understandings which show the experiential nature of ‘being in’ and ‘feeling seen’ in professional development with consequent implications for improved classroom practices. The purpose of this paper is to discuss these issues. Design/methodology/approach – Using interpretive and hermeneutic analyses within a phenomenological inquiry, experiential accounts of the nature of professional development at a New Zealand Primary School are worked for their emergent and ontological themes. Findings – This research reveals the ontological nature of professional development as a matter of ‘being in’ and ‘feeling seen’ in professional development in an embodied, supported and holistic way. Originality/value – Importantly, the nature of a school’s culture and a teacher’s way-of-being within this culture matters to teacher professional development practices and teacher professional growth. Implications exist for school leaders, teacher educators, and teacher and leader education programmes approaches to professional development in relation to the priority of experiential stories for understanding professional development practice, the need for re-balancing a concern for professional knowledge and practice with new teachers as a ‘way of being’ in professional development, and the pedagogical implications of evoking sensitivities and attunement in professional development practice for new teachers. Keywords- Teacher Standards, School Culture, Professional Development, Ontology Paper type- Conceptual research pape

Getting Better (or Worse) All the Time: Support Trajectories and Employee Turnover

As employment relationships develop over time, changes in static perceptions of organizational support (POS) provide the basis for evaluating one’s present and future with an organization. We develop and test hypotheses on how POS and referent POS (RΔPOS) trajectories influence employee turnover intentions. Drawing on a sample of 167 employees, our analysis shows that changes to static POS (ΔPOS) and RΔPOS significantly influence employee turnover intentions. This research extends organizational support theory by shedding light on the dynamic nature of POS and the effects of those changes on employee outcomes, specifically turnover intentions

The Increasing Diversity of America's Youth: Children Lead the Way to a New Era

Children are in the vanguard of America's increasing racial and ethnic diversity. The majority of newborn babies today are among racial and ethnic minority populations, according to recent Census Bureau estimates. U.S. Census Bureau projections indicate that by 2043, non-Hispanic whites will cease to be a majority of the American population. For America's children and youth, the future is now. American diversity is fueled by differing fertility rates among racial and ethnic groups, changes in the racial composition of women of childbearing age, and immigration. Here we document how unfolding demographic forces have placed today's children and youth at the forefront of America's new racial and ethnic diversity. America's rapidly changing racial and ethnic composition hasimportant implications for intergroup relations, ethnic identities, and electoral politics

Global data for ecology and epidemiology: a novel algorithm for temporal Fourier processing MODIS data

Background. Remotely-sensed environmental data from earth-orbiting satellites are increasingly used to model the distribution and abundance of both plant and animal species, especially those of economic or conservation importance. Time series of data from the MODerate-resolution Imaging Spectroradiometer (MODIS) sensors on-board NASA's Terra and Aqua satellites offer the potential to capture environmental thermal and vegetation seasonality, through temporal Fourier analysis, more accurately than was previously possible using the NOAA Advanced Very High Resolution Radiometer (AVHRR) sensor data. MODIS data are composited over 8- or 16-day time intervals that pose unique problems for temporal Fourier analysis. Applying standard techniques to MODIS data can introduce errors of up to 30% in the estimation of the amplitudes and phases of the Fourier harmonics. Methodology/Principal Findings. We present a novel spline-based algorithm that overcomes the processing problems of composited MODIS data. The algorithm is tested on artificial data generated using randomly selected values of both amplitudes and phases, and provides an accurate estimate of the input variables under all conditions. The algorithm was then applied to produce layers that capture the seasonality in MODIS data for the period from 2001 to 2005. Conclusions/Significance. Global temporal Fourier processed images of 1 km MODIS data for Middle Infrared Reflectance, day- and night-time Land Surface Temperature (LST), Normalised Difference Vegetation Index (NDVI), and Enhanced Vegetation Index (EVI) are presented for ecological and epidemiological applications. The finer spatial and temporal resolution, combined with the greater geolocational and spectral accuracy of the MODIS instruments, compared with previous multi-temporal data sets, mean that these data may be used with greater confidence in species' distribution modelling

Validation and Calibration of Models for Reaction-Diffusion Systems

Space and time scales are not independent in diffusion. In fact, numerical simulations show that different patterns are obtained when space and time steps ($\Delta x$ and $\Delta t$) are varied independently. On the other hand, anisotropy effects due to the symmetries of the discretization lattice prevent the quantitative calibration of models. We introduce a new class of explicit difference methods for numerical integration of diffusion and reaction-diffusion equations, where the dependence on space and time scales occurs naturally. Numerical solutions approach the exact solution of the continuous diffusion equation for finite $\Delta x$ and $\Delta t$, if the parameter $\gamma_N=D \Delta t/(\Delta x)^2$ assumes a fixed constant value, where $N$ is an odd positive integer parametrizing the alghorithm. The error between the solutions of the discrete and the continuous equations goes to zero as $(\Delta x)^{2(N+2)}$ and the values of $\gamma_N$ are dimension independent. With these new integration methods, anisotropy effects resulting from the finite differences are minimized, defining a standard for validation and calibration of numerical solutions of diffusion and reaction-diffusion equations. Comparison between numerical and analytical solutions of reaction-diffusion equations give global discretization errors of the order of $10^{-6}$ in the sup norm. Circular patterns of travelling waves have a maximum relative random deviation from the spherical symmetry of the order of 0.2%, and the standard deviation of the fluctuations around the mean circular wave front is of the order of $10^{-3}$.Comment: 33 pages, 8 figures, to appear in Int. J. Bifurcation and Chao