Numerical device simulation is developed to study the steady‐state and transient current‐voltage characteristics of double heterostructure AlGaAs/GaAs PNPN…
Numerical device simulation is developed to study the steady‐state and transient current‐voltage characteristics of double heterostructure AlGaAs/GaAs PNPN electro‐photonic device when its performance is influenced by the presence of interface and bulk recombination mechanism. The simulation results show that the holding current and voltage and the breakover point are strongly affected by varying the minority carrier lifetime at outer heterojunctions. Numerical results also indicate that shortening the minority carrier lifetime in the inner PN homojunction region only increases the OFF‐state current. These results are in agreement with experimental data on AlGaAs/GaAs PNPN devices. The numerical modelling approach taken in this study is shown to be essential in the design and optimization of PNPN switch.
Britain's merchant navy dominated the international maritime trade in the 19th century. The strong ship owners' lobby imposed on the shippers the only choice to contract…
Britain's merchant navy dominated the international maritime trade in the 19th century. The strong ship owners' lobby imposed on the shippers the only choice to contract either under bills of lading drafted almost totally on the ship owners' terms or not to contract. The conflict between Britain and its rival the American merchant navy precipitated a movement for the use of model contracts of shipment (carriage) and towards standardisation of the liability of International liner carriers by legislative intervention. The bill of lading through its use in international trade gained the characteristic of being the document which incorporates the contractual terms. So, the orally agreed contract of carriage gave way to the contract of carriage in the form of a bill of lading.
Few industries may be better suited to study the effects of financial distress on managerial decision making than the airline industry. Economic recessions, natural…
Few industries may be better suited to study the effects of financial distress on managerial decision making than the airline industry. Economic recessions, natural catastrophes, and terrorist attacks are just some of the factors that frequently take a particularly heavy toll on the airline industry. Thus, coping with and overcoming financial distress is a critical aspect of airline management.
The following classified, annotated list of titles is intended to provide reference librarians with a current checklist of new reference books, and is designed to supplement the RSR review column, “Recent Reference Books,” by Frances Neel Cheney. “Reference Books in Print” includes all additional books received prior to the inclusion deadline established for this issue. Appearance in this column does not preclude a later review in RSR. Publishers are urged to send a copy of all new reference books directly to RSR as soon as published, for immediate listing in “Reference Books in Print.” Reference books with imprints older than two years will not be included (with the exception of current reprints or older books newly acquired for distribution by another publisher). The column shall also occasionally include library science or other library related publications of other than a reference character.
In 1938, the Civil Aeronautics Board (CAB) was established to regulate the fare and route structures of the domestic airline industry. At that time, policy‐makers were…
In 1938, the Civil Aeronautics Board (CAB) was established to regulate the fare and route structures of the domestic airline industry. At that time, policy‐makers were fearful that free market conditions in the airline industry would not foster the growth which was deemed to be optimal in the public interest. After forty years of industry development, however, the market structure of the airline industry does not provide justification for regulation. Furthermore, the regulation itself has created problems which are undesirable to both the industry and the public. On October 25, 1978, President Carter signed into law a bill that will gradually remove the regulatory restrictions under which interstate domestic airlines have operated since 1938. All regulatory control over the airlines will end by 1982, and the CAB will be abolished in 1985.
In 1899 the medical practitioners of Dublin were confronted with an outbreak of a peculiar and obscure illness, characterised by symptoms which were very unusual. For want of a better explanation, the disorder, which seemed to be epidemic, was explained by the simple expedient of finding a name for it. It was labelled as “beri‐beri,” a tropical disease with very much the same clinical and pathological features as those observed at Dublin. Papers were read before certain societies, and then as the cases gradually diminished in number, the subject lost interest and was dropped.
Reviews a book focused on green marketing management, weak on itslogistical implications; and a journal article looking at servicequality in the transportation industry.
Reviews a book focused on green marketing management, weak on its logistical implications; and a journal article looking at service quality in the transportation industry.
The purpose of this paper is to examine the past 50 years of driver research from a historical context linked to the political and economic developments of the US motor carrier industry.
A comprehensive literature review was conducted and studies were targeted that exemplified eras of historic change pertaining to trucking published within the top-tier logistics journals.
Distinctive categorizations of driver research emerged: organizing era from 1930 to 1949, era of the collective mind from 1950 to 1979, era of the individual from 1980 to 2009 and the era of the driver as extension of the firm from 2010 to present. Research streams are highly influenced by current industry developments, economic conditions and the political landscape.
The chronological framework of research established specific time-based eras. An alternative framework or other emerging eras may be conceived as scholars consider factors in addition to those explored within this research.
Managers within developing countries may leverage the research within a specific era to help resolve driver problems that have already been researched in the USA. Scholars are encouraged to further study truck drivers as critical extensions of the firm in light of the advances in autonomous vehicles, drones and other technology impacting the motor carrier industry.
For nearly a half century, the turnover of truck drivers has been a major issue. This research provides driver managers with the knowledge to better understand and to more adequately provide for the needs and welfare of truck drivers.
This research is the first to fully connect the research and developments pertaining to the motor carrier industry, the occupation of truck driving and the historical developments of US policy and the economy.
A non‐equilibrium multi‐valley transport model for carriers in compound semiconductor devices has been developed. This macroscopic transport model provides an efficient…
A non‐equilibrium multi‐valley transport model for carriers in compound semiconductor devices has been developed. This macroscopic transport model provides an efficient scheme for device modeling, and can overcome the difficulty in evaluating the relaxation times in multi‐valley conservation equations without a priori assumption of the displaced‐Maxwellian distribution. This model has been successfully applied to electron transport in GaAs subjected to rapidly time‐varying fields. The results have suggested that the macroscopic effective mass of electrons might be strongly dependent on average velocity.