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A method is described by which systems may be represented as a collection of interlocking shells which indicate the boundaries of the components. It is suggested that this method gives a good visual impression of basic systemic properties such as openness, types of interaction, relative power of components, hierarchies and levels of organization.

This article summarises different approaches to defining what constitutes a drug‐related death (DRDs) and how they can be classified. DRDs usually fall into two broad categories: (a) those directly attributable to the consumption of drugs (both illegal and licit) eg. overdose and poisoning, and (b) indirect ‐ those which occur as a consequence of having a drug habit that exposes individuals to the risk of dying in some other way, eg. blood‐borne infections, accidents. Most attention is currently given to direct or ‘acute’ DRDs rather than the long‐term consequences of drug abuse. Problems associated with accurately deriving DRD statistics are outlined. Despite their limitations, such information is essential for identifying issues related to drug use and measuring progress against targets set for reducing DRDs.

Despite of the numerous characteristics of the multirotor unmanned aircraft systems (UASs), they have been termed as less energy-efficient compared to fixed-wing and helicopter counterparts. The purpose of this paper is to explore a more efficient multirotor configuration and to provide the robust and stable control system for it.

A heterogeneous multirotor configuration is explored in this paper, which employs a large rotor at the centre to provide majority of lift and three small tilted booms rotors to provide the control. Design provides the combined characteristics of both quadcopters and helicopters in a single UAS configuration, providing endurance of helicopters keeping the manoeuvrability, simplicity and control of quadcopters. In this paper, rotational as well as translational dynamics of the multirotor are explored. Cascade control system is designed to provide an effective solution to control the attitude, altitude and position of the rotorcraft.

One of the challenging tasks towards successful flight of such a configuration is to design a stable and robust control system as it is an underactuated system possessing complex non-linearities and coupled dynamics. Cascaded proportional integral (PI) control approach has provided an efficient solution with stable control performance. A novel motor control loop is implemented to ensure enhanced disturbance rejection, which is also validated through Dryden turbulence model and 1-cosine gust model.

Robustness and stability of the proposed control structure for such a dynamically complex UAS configuration is demonstrated with stable attitude and position performance, reference tracking and enhanced disturbance rejection.

OWING to the comparatively early date in the year of the Library Association Conference, this number of THE LIBRARY WORLD is published so that it may be in the hands of our readers before it begins. The official programme is not in the hands of members at the time we write, but the circumstances are such this year that delay has been inevitable. We have dwelt already on the good fortune we enjoy in going to the beautiful West‐Country Spa. At this time of year it is at its best, and, if the weather is more genial than this weather‐chequered year gives us reason to expect, the Conference should be memorable on that account alone. The Conference has always been the focus of library friendships, and this idea, now that the Association is so large, should be developed. To be a member is to be one of a freemasonry of librarians, pledged to help and forward the work of one another. It is not in the conference rooms alone, where we listen, not always completely awake, to papers not always eloquent or cleverly read, that we gain most, although no one would discount these; it is in the hotels and boarding houses and restaurants, over dinner tables and in the easy chairs of the lounges, that we draw out really useful business information. In short, shop is the subject‐matter of conference conversation, and only misanthropic curmudgeons think otherwise.

The most significant event for the School has been the announcement of the creation of the National Centre for Management Research and Development. The Centre is due to open in 1986 and will provide research facilities for up to 20 major projects designed to improve the competitiveness of Canadian business practices.

THE importance of the book as an educational agency has so long been recognized, that it will be unnecessary for me to dwell upon that side of the question. Yet it is impossible to ignore it altogether, for it is in the educational power of the book that we find the main reason for the existence of the school library. The elementary schools carry education up to a certain point, and the technical schools and universities take it up and carry it still further, but it is the library—or at any rate the book—which co‐ordinates the whole ; many people, indeed, have no education beyond the elementary school, except what they obtain from books. From this, the part played by the school library becomes obvious. Not only is it a powerful educator in itself, but it prepares the individual for the use of the Public Library and of books in general in the period following school life. Also, I need hardly point out that, although the use of the text‐book is dis pensed with as far as possible, the whole modern system of teaching is founded on the use of books.

It is now common for finance textbooks to discuss the concepts of the CAPM, diversification benefit, and systematic risk, as measured by beta. The purpose of this paper is to clarify aspects of these concepts and make the textbooks readers aware of them. In particular, this paper seeks to: (1) clarify the notion that “diversification reduces risk,” (2) provide geometric expositions and algebraic expressions of portfolio benefits in the context of both total risk and market risk, and (3) improve the interpretation of beta.

This article provides a critical review of four constructs-organizational identification, organizational commitment, occupational identification, and occupational commitment-to advance our understanding about how public sector employees from different occupations may become psychologically attached to their organizations. This review is intended to clarify previous inconsistencies as well as spark new interest among public administration researchers to examine sources and consequences of public employees’ organizational identification and commitment. This article also elucidates about how public sector employees’ attachment to their occupations may influence their attachment to their organizations. In that effort, this article reviews interrelationships among the four constructs. Finally, based on the patterns of connections observed, a future research program including seven testable research propositions is proposed.

I. INTRODUCTION This study attempts to extend and expand previous research conducted by the Department of Marketing at Strathclyde on the adoption and diffusion of industrial products.

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some legal aspects concerning MNEs, cyberspace and e‐commerce as the means of expression of the digital economy. The whole effort of the author is focused on the examination of various aspects of MNEs and their impact upon globalisation and vice versa and how and if we are moving towards a global digital economy.