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I‐V characteristics of GaAs n‐i‐n structures are calculated by considering impact ionization of carriers. Impact ionization at reverse‐biased n‐i junction becomes a cause of steep current rise when an acceptor density in the i‐layer is high. It is shown that an optimum acceptor density exists to keep a good isolation. Photoconduction transients of GaAs n‐i‐n structures are also simulated, and are shown to be strongly affected by existence of n‐i junctions.

In the course of development of human communities towards industrially advanced societies of today, there have been changes not only in economic conditions in the majority of fields of human activity but also in the ways of providing for food, which went hand in hand with changes in living conditions. Large‐scale industrial production has brought about major changes in the way of life of the population. The development of industrial agglomerations results in a growing number of city dwellers, most of whom have no chance of producing foodstuffs of their own in kind. The distance between residential and industrial areas has been growing, the number of employed women has risen considerably. These are but a few factors affecting the way of boarding, particularly in households.

This paper outlines some of the factors which are important in helping or hindering women with learning disabilities to experience their sexuality in a positive and healthy way. Based on direct experience, the paper presents the factors which must be present for women with learning disabilities to enjoy their sexuality: making choices, giving consent, receiving information, experiencing mutuality, experiencing pleasure, having self‐esteem and having recourse to the law if abused. Conversely, the factors which need to be absent are coercion, oppression, guilt and shame, and unwanted physical consequences. The paper emphasises how important it is that women with learning disabilities and their supporters understand these factors.

In this paper, we introduce the concept of a supporting set for a general system. We study basic properties of supporting sets for a general system, supporting sets for subsytems of a system, homomorphic images of supporting sets for a system, and supporting sets for free sums and direct sums of systems.

Strategic management—the infusion of strategic principles in the running of a business—has demonstrated impressive power by dramatically improving the performance of a number of major companies that implemented it. (See Exhibit 1.) This concept, born in the early Seventies, is now experiencing the adolescent struggles of what Gail Sheehy, the author of Passages, calls, “gaining authenticity” and “ego strength.” Now, an era of self assurance, authority and leadership is at hand.

This second article in a series of six focuses on leisure as one of the impending waves of economic activity projected to dominate the advanced economies over the course of the new millennium. Leisure will begin to dominate jobs and economic activity in the USA around 2015, the date when “free time” will occupy over half of total individual lifetime activity. Businesses providing goods and services to meet leisure‐time demands that will account for the dominant share of gross domestic product (GDP), jobs and livelihoods during the 21st century include: recreation, hospitality, entertainment, travel and tourism, adventure seeking, to name just a few sectors.

In the paper the optimization procedure of a direct current motor with a hybrid excitation has been presented. The excitation system consists of a shunt field winding disposed around field pole and permanent magnet, both acting in parallel. The field distribution in motor for various magnet and field pole dimensions has been determined using finite element method. The flux linkage with the armature winding has been computed. Demagnetizing effect of armature current was taken into account. The optimal permanent magnet and the field pole dimensions, ensuring minimum total cost of purchase and work during assumed period of time were calculated. Motor characteristics e.g. rated torque, rated current, speed regulation limit were used as constraints. In worked up algorithm and computer program Carroll internal penalty function method was used. Some basic suggestions tor design of optimal hybrid excited dc motors with parallel permanent magnet and electromagnetic excitation are given.

This paper aims to encourage PR practitioners to appreciate their role as the pivot of their organisation’s reputation management. It discusses the importance of codes of ethics, claiming that these should be reviewed by public relations associations every 4‐5 years. Good conduct is essential for every PR practitioner as a reputation manager, and PR associations must ensure that codes of ethics are enforced. PR associations should address the challenge posed by the boom in the labour markets for PR practitioners by ensuring that all practitioners are well trained.

A number of U.S. studies have documented an optimistic bias in analysts’ forecasts of earnings. This study investigates whether the optimistic bias and asymmetric behavior of forecast errors found in most U.S. studies exists in Japan. We find that for firms reporting profits, Japanese analysts’ forecasts have much greater accuracy and exhibit a small pessimistic bias in comparison to firms reporting losses, where analysts’ forecasts exhibit extremely poor accuracy and an extremely significant optimistic bias. The lack of ability to forecast losses is due to their transitory nature and not due to earnings management. Forecast accuracy and bias are not related to firm size, but are related to the magnitude of reported lossess and profits.

For the corporate real estate executive who is in the process of transforming the department to be a strategic business partner, this paper presents examples of initiatives used to ensure the workplace is aligned with the long‐term corporate strategy. This paper analyses the benefits of corporate real estate being viewed as a business partner in addition to a service provider.