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IN the past, the required amount of directional stability was dictated mainly by asymmetric power considerations and by the maximum angles of sideslip in manoeuvres permissible from the structural strength viewpoint. The requirement for satisfactory recovery from steady spin would in certain cases influence both the directional stability and control power in such a fashion as ultimately to be the determining factor. Present indications are that the choice of the required degree of directional stability will be based on supersonic lateral dynamic stability considerations, in particular the stability of the so‐called Dutch roll oscillation, or on considerations of avoiding inertia coupling between the lateral and longitudinal degrees of freedom during rolling. Both of these problems will be discussed in some detail later. It should be emphasized, however, that large values of subsonic directional stability will be required for supersonic aircraft in order to provide satisfactory dynamic characteristics at supersonic speeds at high altitudes.

BEFORE a detailed consideration of internal stresses may be made, it is necessary to define external loadings which are possibly critical. This involves the consideration of manoeuvres throughout the altitude range of the aeroplane, to a severity fixed by aerodynamic or specification values of speed and normal acceleration.

FROM time to time there appear in our Research Reports and Memoranda pages summaries of reports issued by the Canadian National Research Council of work done in the National Aeronautical Establishment or various laboratories of the Division of Mechanical Engineering.

Due to discontent arising from the application of Modernism's totalitarian and homogenising logic to house design, recent research has concentrated on differences between cultures, societies and ethnic groups to the extent that today's students of architecture have difficulty finding sources which point to any universally valid values and preferences adopted by contemporary populations. In this study seventeen major design principles stemming from man-environment relationships, such as privacy, territoriality, personal space, backstage behaviour, orientation, and so on, as deduced from Turkish traditional houses, are investigated in terms of similarities among cultures. Samples of contemporary houses are selected from Turkey and elsewhere. Between local and international house designs full matches are depicted and verified by way of statistical analyses across fourteen items, such as living space subdivisions for guests and family, indirect access to the house (modulation), multi-purpose living space subdivisions (hierarchical living space), individualized bathrooms in bedrooms, independent family rooms, semi-closed spaces on the first floor, larger fenestration on upper floors as opposed to opacity of ground floors, segregated garden space, powerful demarcation of the garden space, orientation toward the house's own territory, bathrooms being situated in night time domains, differentiated status of spaces, multiple uses for stair landings (such as for hiding places for goods). Only three items showed some variance: closed balconies on upper floors were local, and semi-open spaces on ground floors were international tendencies. The practice of allowing direct access from the main entrance to a vertical circulation area was also predominantly a local choice.

This chapter explores how “discourse,” as a process concerned with the production and consumption of talk and text, has been embraced within the field of organizational change and development (OCD). We present six ways of thinking about the role of discourse in OCD (namely: “discourse as component,” “discourse as process,” “discourse as analysis,” “discourse as method,” “discourse as mindset,” and “discourse as style”). Although the advent of dialogic OD has raised awareness of discourse, we demonstrate that it remains a marginal and under-utilized area of interest. We conclude by making a case for a more expansive role for discursive modes of analysis and engagement within OCD.

Mobility has wide‐range impacts on the financial management of property issues, such as consumption and investment. In the literature of residential mobility, household life cycle is widely acknowledged as an important concept. An array of household demographic factors such as age has been repeatedly found to be significant in influencing mobility. Many previous researches offer few verifi able hypotheses or propositions and their results are conflicting. Some of them also suffer methodological inadequacies. This paper is an attempt to rectify this situation. There are two important contributions by the current research. One is a methodology that employs multivariate methods, which fills the gap of previous research. The second contribution is the large census dataset of Hong Kong which is rare in previous studies. The research is conducted under the framework of life cycle models with emphasis on economic and demographic variables of households. Demographic determinants are found to be more important in explaining population mobility among rental households while economic factors are more pertinent for owners. This may be explained by the different strategies adopted by renters and owners in satisfying their housing needs. Renters are envisaged to base their mobility decisions more on demographic factors. Owners, on the other hand, tend to view home buying as an investment as well and hence put more emphasis on economic factors. It is hoped that this research can shed more light on the topic of residential mobility by drawing on the experience of a large population residing in a small place, Hong Kong