Radiant flux through apertures—I

Equations for the calculation of radiant power F through two apertures in series are well known. A characteristic of these formulae is that they give F as a small difference between two large terms. Evidently, the flux through the apertures must decrease as the spacing between them increases; and for large spacing, the inverse-square relation must hold. Instead of exhibiting this behaviour in an obvious manner, however, the traditional equations give the specious impression of an increase in F with increase in spacing. The paper develops an approximate formulae that applies to apertures in the shape of any regular polygon and that shows clearly how the inverse square relation is approached for large separation.     

Simplified interflection calculations

The purpose of the paper has been to present simplified methods that will expedite the calculation of ceiling lighting (Type II). Approximate formulas have been given, which allow ordinary slide-rule calculations to be made very easily for the usual range of variables. Only with rooms having very high domance (or perhaps with extraordinarily high floor reflectance) are the complicated equations of the previous paper (1) needed. These approximate formulas can be represented also by alignment charts, Figs. 2 to 5, which further simplify the work.Either the formulas or the charts may be used to investigate the effect of a change in ?₁, ?₂, or ?₃. However, if reflectances are standardized at recommended values, other methods are possible.In particular, one may use graphs (Fig. 6) or a slide-rule (Figs. 7 and 8). The method of calculation chosen for a specific problem will depend on the problem and on the preferences of the designer. The previous equations and tables (3) may always be used; but in most cases, time can be saved by employing the short-cuts given in the present paper.     

Separability in a class of coordinate systems

A study is made of separability conditions for the Helmholtz and Laplace equations. Attention is confined to the most useful case for physical applications; namely,

1.

(a) The coordinate system is either cylindrical or it has rotational symmetry, and     

Interflectance calculations for various luminaires

Previous interflectance tables have dealt principally with three basic types of lighting (Types I, II, and III). The present paper extends the scope of the interflection method by showing how it can be applied to rooms lighted by hanging luminaires. It is found that most cases arising in practice can be covered by six canonic distributions. The effect of mounting height is handled by means of a simple equation.     

Education research and policy making in higher education: the case of Dearing

In establishing a National Committee of Inquiry into Higher Education in the United Kingdom (the Dearing Committee), the Government expected short-term problems and long-term developments to be examined in less than half the average time taken by previous inquiries. Conscious of the intellectual authority of its predecessor, the Robbins Committee, the Dearing inquiry commissioned a large number of research and analytical studies to inform its deliberations. The ways that research and other forms of evidence were collected and considered by the inquiry are discussed in relation to four themes: the context and conditions for the inquiry; the nature of the work commissioned; the treatment of public evidence and the use of research to inform key recommendations; and what the episode disclosed about the relationship between education research and policy-making in higher education. In the course of this commentary, it is suggested that the uneven engagement with research and academic literatures in the Dearing inquiry was not simply a function of its terms and conditions of existence, but reflected more general features of the contemporary research base and policy environment in higher education.     

Children's Vulnerability to Interparental Conflict: The Protective Role of Sibling Relationship Quality

This study tested whether the strength of the mediational pathway involving interparental conflict, adolescent emotional insecurity, and their psychological problems depended on the quality of their sibling relationships. Using a multimethod approach, 236 adolescents (M_age = 12.6 years) and their parents participated in three annual measurement occasions. Tests of moderated mediation revealed that indirect paths among interparental conflict, insecurity, and psychological problems were significant for teens with low, but not high, quality bonds with siblings. High-quality (i.e., strong) sibling relationships conferred protection by neutralizing interparental conflict as a precursor of increases in adolescent insecurity. Results did not vary as a function of the valence of sibling relationship properties, adolescent sex, or gender and age compositions of the dyad.     

Internet Resources for Hospice and Bereavement

ABSTRACT

In the last ten years, there has been an upsurge of interest in matters related to improving care at the end of life. This article presents a brief overview of hospice, a type of interdisciplinary end-of-life care that aims to relieve the pain and symptoms of the dying, support the family during the process, and offer bereavement assistance afterward. Useful Web sites related to hospice and grief intended for the use of health care professionals and consumers are identified and described.