Transformation between orbital parameters in different coordinate systems of the general relativistic schwarzschild problem

The relationships between the osculating orbital elements for a family of solutions of the general relativistic Schwarzschild problems are developed. These relationships provide a method for evaluating orbital elements in different Schwarzschild coordinate systems without the necessity of fitting to real data every time the system of coordinates is changed. The objectivity of different coordinate systems is discussed. Considerations of orbital motions favor the standard Schwarzschild metric, but the propagation of light signals is more objective in the metric of Painlevé. Because the orbital motions usually dominate the representation of data, the standard Schwarzschild coordinates are the best objective choice for most applications.     

The small-gain theorem,the passivity theorem and their equivalence

Two small-gain theorems and a passivity theorem yielding stability results for general feedback systems are shown to be equivalent.     

Australian Higher Education Research and Society

This is the second part of a review of research on higher education since World War II. Fart I, published in the previous issue of this Journal, examined how research responded to post‐war reconstruction of the later 1940s and the rising community expectations for education of the 1950s and 1960s. In Part II the themes are equality of opportunity and the end of expansion. By the mid‐1960s many researchers were questioning the representativeness of participation in higher education and the nature of the education process. More recently some of the research questions have been reminiscent of the late 1940s, that is, how can the efficiency of higher education be improved. Whereas expansion and optimism characterised the first thirty post‐war years however, the context is now one of reduced resources and some pessimism.     

Communication: One key to mainstreaming success

Mainstreaming the exceptional child necessitates that regular and special teachers work much more closely today than in the past. The most important element for successful mainstreaming is effective communication (Schubert & Glick, 1981). This article describes the collaborative consultation model as one approach to attaining good, effective communication.     

Differential costs of curricula in Illinois public junior colleges: Some implications for the future

The purpose of this study was to determine and analyze the annual cost of operation including depreciation of movable capital equipment for educating one student in each curriculum of selected community colleges and to show the relationship of costs of vocational-technical curricula to the cost for common baccalaureate oriented curricula.A stratified sample of eight community colleges was drawn from those that had been in operation for at least five years.These data indicate that a majority of the courses offered in highly specialized curricula in both the occupational and baccalaureate categories were more expansive than those courses that were common to a wide variety of curricula.This study supports differential program funding to assure continued development of high quality vocational-technical programs in community colleges.     

Association between self-reported health and physical and/or sexual abuse experienced before age 18

OBJECTIVE: The present study evaluated the association between women's health and physical and sexual abuse suffered before age 18. METHODS: A total of 3,568 randomly sampled insured women ages 18-64 completed a telephone interview to assess history of physical only, sexual only, or both physical and sexual abuse before age 18 (Behavioral Risk Factor Surveillance System); and current health (Short Form-36, Center for Epidemiologic Studies-Depression, Presence of Symptoms surveys). Adjusted analyses compared the health of women with physical abuse only, sexual abuse only, or physical and sexual abuse to the health of women without these abuse histories. RESULTS: Poorest health status was observed in women with a history of both physical and sexual child abuse compared to women without these abuse histories. In models that adjusted for age and income, women with both abuse types had increased prevalence of depression (prevalence ratio, 2.16), severe depression (PR, 2.84), physical symptoms (PR range, 1.33 for joint pain to 2.78 for nausea/vomiting), fair/poor health (PR, 1.84), and lower SF-36 scores (3.15-5.40 points lower). Women with physical abuse only or sexual abuse only also had higher prevalence of symptoms and lower SF-36 scores but the associations were not as strong. CONCLUSIONS: This study adds to the literature showing a graded association between multiple adverse events in childhood and adult health.