K. Zakrzewski and M. Lukaniszyn
The calculation of quasistationary magnetic fields and electrostatic fields of several objects is presented in the paper. In the range of the magnetic fields of coils and…
Abstract
The calculation of quasistationary magnetic fields and electrostatic fields of several objects is presented in the paper. In the range of the magnetic fields of coils and transformer systems parallelepiped calculation regions are assumed. In the range of electrostatic fields analysis of the field in tanks of different shape storing inflammable liquids was undertaken. Fast subroutines using finite differences [FDM] to calculate the field were employed. These subroutines are based on the Fast Fourier Transform (FFT).
At the January meeting of the American Library Association in Washington, DC, IBM equipment and products led the field against Apple and other microcomputer brands. Predictions…
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At the January meeting of the American Library Association in Washington, DC, IBM equipment and products led the field against Apple and other microcomputer brands. Predictions that the IBM PC would become the de facto standard library computer have clearly been fulfilled. It now appears that more powerful IBM products——such as the AT——and a host of peripherals will shortly become commonplace library equipment.
D.E. Clippinger and G.J. Morris
THE use of liquid oxygen as an oxidizer for various fuels in liquid rocket propellent systems is not new. Professor Goddard used liquid oxygen in his rocket experiments and the…
Abstract
THE use of liquid oxygen as an oxidizer for various fuels in liquid rocket propellent systems is not new. Professor Goddard used liquid oxygen in his rocket experiments and the well known German V‐2 rockets used this material as an oxidizer. However, its effect on non‐metallic materials ordinarily used in rocket systems was not investigated until recent years. This investigation was prompted by phenomena which had been experienced by rocket engine and rocket aircraft manufacturers and by suppliers of the material. It was observed that when some organic materials came in intimate contact with liquid oxygen they became prone to detonation when subjected to certain impact energies. This was undoubtedly due to the formation of unstable organo‐peroxide compounds which when impacted released high levels of energy resulting in an explosion. Specifically, when liquid oxygen was accidently spilled on asphalt and inadvertently stepped on, the asphalt would often explode. Also, leather gaskets immersed in liquid oxygen and subjected to surge impact detonated with disastrous effects.
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…
Abstract
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.
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…
Abstract
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…
Abstract
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 article, third in a series of six, describes Life Sciences Era activities. Life sciences, rapidly gaining momentum, will begin to dominate US economic activity by 2100, then…
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This article, third in a series of six, describes Life Sciences Era activities. Life sciences, rapidly gaining momentum, will begin to dominate US economic activity by 2100, then predominate well into the following century (see Figure 1). Massive advances will follow as the 140 000 genes, and 3 billion molecular units (base pairs) comprising the human genome are plotted in rough draft before 2001, and definitively charted by 2003. Once laid out, comprehending genetic patterns provides the means to govern many of the 75 trillion parts in every human.
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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…
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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.
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The M300/IBM PC Users Group is rapidly gaining new members and has been offered a Bulletin Board in Des Moines, IA for its use. What is needed now are persons across the country…
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The M300/IBM PC Users Group is rapidly gaining new members and has been offered a Bulletin Board in Des Moines, IA for its use. What is needed now are persons across the country who are willing to work with the administrative agent to establish a leadership structure, to plan the group's initial meeting during the Chicago 1985 ALA conference (July 6–11), to develop the parameters of the bulletin board, to set membership criteria, to develop users group goals and objectives, to develop and lead local chapters, and to report news and activities to M300. Back issues of M300 and PC REPORT contain an application form which may be used for membership, suggesting, or reporting purposes. We particularly need persons who are willing to be officers and volunteers.
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…
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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.