Relativistic precession of quantum elliptical states in the Coulomb potential

A special relativistic perturbation to non-relativistic quantum mechanics is shown to lead to the special relativistic prediction for the rate of precession for quantum states in the Coulomb potential. This behavior is shown using SO(4) coherent states as examples. These states are localized on Kepler ellipses and precess in the presence of a relativistic perturbation.Comment: 10 pages, 3 figures, submitted to Am.J.Phys, revised for style, improved figure

An investigation into the numerical prediction of boundary layer transition using the K.Y. Chien turbulence model

Assessments were made of the simulation capabilities of transition models developed at the University of Minnesota, as applied to the Launder-Sharma and Lam-Bremhorst two-equation turbulence models, and at The University of Texas at Austin, as applied to the K. Y. Chien two-equation turbulence model. A major shortcoming in the use of the basic K. Y. Chien turbulence model for low-Reynolds number flows was identified. The problem with the Chien model involved premature start of natural transition and a damped response as the simulation moved to fully turbulent flow at the end of transition. This is in contrast to the other two-equation turbulence models at comparable freestream turbulence conditions. The damping of the transition response of the Chien turbulence model leads to an inaccurate estimate of the start and end of transition for freestream turbulence levels greater than 1.0 percent and to difficulty in calculating proper model constants for the transition model

Using competition for performance improvement : a resource for practitioners advising governments and not-for-profits

https://egrove.olemiss.edu/aicpa_guides/1605/thumbnail.jp

Applying OCBOA in state and local governmental financial statements; AICPA practice aid series;

https://egrove.olemiss.edu/aicpa_guides/1000/thumbnail.jp

Habitat Use by Reintroduced Mountain Quail

Mountain quail (Oreortyx pictus) have declined in much of the Intermountain Region of the western United States. Many areas that once supported these birds now seemingly lack necessary food and cover, especially in critical riparian zones. Additionally, mountain quail appear to need periodic disturbance (fire, moderate grazing, etc.) to provide adequate forage and nesting areas. If mountain quail do not readily occupy suitable habitats, either because of restricted movements or because of habitat discontinuities, it may be necessary to stock birds in order to restore populations. In September 1995, we began a restoration program with the objective of reintroducing mountain quail into former ranges in eastern Oregon and Washington. In the winter of 1996--1997, we released 17 radio-marked birds into a drainage in Hell\u27s Canyon as a pilot study to determine habitat use, survival estimates, and movement patterns. An additional 40 radio-marked birds were released during spring 1998 to determine habitat use, nesting success, and brood survival

Demographic structure of a transplanted Tlaxcalan population in the Valley of Mexico

This is the published version, also available here: http://www.jstor.org/stable/41462806.This research explores the evolutionary consequences of the transplantation and subsequent demographic adaptation of Cuanalan, a migrant population in the Valley of Mexico. Through comparisons with historical and contemporary populations from the area of origination—the state of Tlaxcala—an attempt is made to reconstruct the demographic and evolutionary changes which have occurred in the splinter population over the past four centuries. Both demographic and preliminary genetic data indicate that Cuanalan is a hybridized population. About two-thirds of marriages of Cuanalan-born individuals are endogamous. Average number of liveborn children for prolific women over 40 is 6.5. Since 1866, mean age at death in the community is 20.8 years, and the infant death rate is 30%. Major causes of death are respiratory diseases, gastrointestinal disorders, and childhood infections. The high variance in completed fertility and high pre-reproductive mortality indicate a continuation of conditions making for the rapid action of natural selection which have historically characterized Tlaxcalan populations. Genetic drift was probably an important factor in the early differentiation of the migrant population. The data suggest that the evolutionary divergence of Cuanalan from the Tlaxcalan gene pool has been rapid and extensive

Response to Wolf et al.: Furthering Debate over the Suitability of Trap-Neuter-Return for Stray Cat Management

To continue dialogue over proposed Australian trials of Trap-Neuter-Return (TNR), we applied a framework requiring identification of areas of agreement, areas of disagreement, and identification of empirical data collection required to resolve disagreements. There is agreement that Australia has a problem with stray cats, causing problems of impacts on wildlife, nuisance,disease transmission (including public health issues and exchange of diseases between stray cat and pet cat populations), poor welfare outcomes for stray cats, and an emotional burden on staff euthanising healthy stray cats. There is disagreement on whether (i) current measures are failing, leading to unacceptably high euthanasia levels, (ii) some contributors to the debate misunderstand TNR, (iii) TNR trials will reduce urban cat populations and associated problems, (iv) TNR is an ethical solution to cat overpopulation, and (v) some contributors to the debate promulgated misinformation. Although not everyone agrees that TNR trials should proceed, as a hypothetical exploration, we propose an experimental approach explicitly comparing TNR to alternatives. Trials could only be considered if other detailed and well-funded attempts at stray cat control focusing across an entire Local Government Area (LGA) prove ineffective

PTC Taste Threshold Distributions and Age in Mennonite Populations

This is the published version. Copyright 1982 Wayne State University Press.A number of studies report an impairment of the genetically inherited ability to taste PTC as a function of age, but ignore the cumulative effect of smoking on taste deterioration. This study examines the effect of aging on taste sensitivity in nonsmoking Mennonite populations. The results obtained preclude a cause and effect relationship between age and PTC taste sensitivity. These results are congruent with the claims which ascribe the observed deterioration in PTC taste sensitivity to the cumulative effects of smoking, rather than to the effects of aging per se

Towards a Strategy for Improving Agricultural Inputs Markets in Africa

Agribusiness, Downloads July 2008-July 2009: 19,