Search results

An energy‐momentum transport model for sub‐micron silicon devices is modified to include new sets of simple interband scattering models representing impact ionization, auger recombination, trapping and photo generation. These have been developed using a simplified physical modelling approach. A discretization scheme suitable for application to an irregular spatial grid is presented. The resulting model is suitable for the study of small geometry effects in silicon devices.

A full consistent discretization scheme of the improved carrier density, momentum‐ and energy‐conservation equations is presented. The carrier heat flux as well as the convection and recombination terms are considered. The convection terms are averaged and then the differential constitutive relations of the current density and the energy flux are solved. The proposed discretization scheme generalizes the Scharfetter‐Gummel (S‐G) difference approximation to the generalized hydrodynamic model (HDM). On the basis of this scheme the hydrodynamic equations (HDE's) are solved for both electrons and holes. The transport of hot carriers in the p‐i‐n diode is investigated over a large scale of biasing values. The electric field distribution is not severely purturbed by the hot electron effects up to the medium biasing range. However, the minority carrier distribution is significantly affected by the carrier temperature‐gradients near the space‐charge‐regions. The minority carriers that are diffused to the edge of depleted regions are heated and if the carrier temperature gradient is sufficiently strong they diffuse back to the neutral cold region rather than to be captured by the electric field as known from the standard DDM theory.

The Equal Pay Act 1970 (which came into operation on 29 December 1975) provides for an “equality clause” to be written into all contracts of employment. S.1(2) (a) of the 1970 Act (which has been amended by the Sex Discrimination Act 1975) provides:

In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of material poses problems for the researcher in management studies — and, of course, for the librarian: uncovering what has been written in any one area is not an easy task. This volume aims to help the librarian and the researcher overcome some of the immediate problems of identification of material. It is an annotated bibliography of management, drawing on the wide variety of literature produced by MCB University Press. Over the last four years, MCB University Press has produced an extensive range of books and serial publications covering most of the established and many of the developing areas of management. This volume, in conjunction with Volume I, provides a guide to all the material published so far.

Reports on the status of electronic data interchange (EDI) usage by motor carrier firms in 1994. The same methodology was employed as in a similar study conducted in 1991, thereby permitting a comparison of practice between these two time periods. The results indicate that a number of changes have occurred between 1991 and 1994. For example, as carriers have become more experienced with EDI, their EDI services offerings have become a larger percentage of their freight revenues. New problems have arisen (e.g. organizational barriers) as carriers integrate EDI more completely. On the other hand, the results also indicate where change has not occurred. Technical standards remain a “non issue” for carriers, yet finding relevant software remains an issue. Examines these and other findings and discusses their implications.

This article provides a broad overview of telecommunications and network‐related technologies. Topics covered include identification and review of network elements, analog and digital signals, synchronous and asynchronous transmission formats, transmission media and equipment, transmission techniques and characteristics, multiplexing, network types, access technologies, network architectures and topologies, local‐area network technologies and attributes, protocols and protocol issues, gateways, internetworking, local networking alternatives, equipment certification, and various aspects of network management. It is intended to provide the practicing professional in the field of library and information science with a broad, up‐to‐date technical review that might serve to support and facilitate further investigation of current developments in networks and networking. Although the broad range of topics is not treated in depth, numerous references are provided for further investigation.

The distribution sector has been hard hit by the energy/ecology crisis. Higher fuel costs coupled with reduced availability of many energy sources have adversely affected distribution activities. Growing levels of pollution have caused global concern. As a part of the physical distribution activity, the transportation modes have been particularly vulnerable to the energy/ecology crisis because they rely so heavily on energy resources. It is important that those involved in physical distribution understand the distribution‐energy/ecology interface. Recognition of the effects that the energy/ecology crisis has had, and will have, on distribution is an integral part of logistics planning and control. The energy/ecology crisis will not go away and it behoves the physical distribution manager, educator and public policy maker to: (1) Understand the Problem, (2) Recognise how the problem pertains to him directly and/or indirectly, and (3) Determine how he and others will react to the problem in the future.

A great deal of attention in physical distribution management has been raised by both practitioners and academicians as to what type of carrier service is desired by shippers and consignees. From the viewpoint of the buying system, the selection of an appropriate transport mode and the selection of a given carrier and particular services offered by the carrier is an important decision. Billions of dollars are spent annually by the shipping public. The sheer magnitude of the expenditure coupled with the limitation on customer service which can result from the carrier selection choice is making it an increasingly important decision. Purchasing systems need better information concerning carrier selection variables than they now have to enable them to design the organisation for buying carrier services, and to select, train, and supervise traffic people as well as to decide how much of the process can be computerised.

The “thermodynamic model” constitutes a unified theoretical framework for the coupled simulation of carrier and energy flow in semiconductor devices under general ambient conditions such as, e.g., the presence of a quasi‐static magnetic field or the interaction with an electromagnetic radiation field (light). The current relations governing particle and heat transport are derived from the principles of irreversible phenomenological thermodynamics; the driving forces include drift, diffusion, thermal diffusion, and deflection by the Lorentz force. All transport coefficients may be interpreted in terms of well‐known thermodynamic effects and, hence, can be obtained from theoretical calculations as well as directly from experimental data. The thermodynamic model allows the consistent treatment of a wide variety of physical phenomena which are relevant for both the operation of electronic devices (e.g., lattice heating, hot carrier and low temperature effects) and the function of microsensors and actuators (e.g., thermoelectricity, galvanomagnetism and thermomagnetism).

WE have recently published one or two articles in which a contributor with a considerable knowledge of the Chinese economy has described some of that country's industrial activities. The articles have been scrupulously factual and impartial in revealing the ingenuity which has enabled a people desperately short of the technological resources of the industrialised nations to secure for themselves some of life's essentials.