摘要:

The heteroepitaxial growth of InP on Si by low pressure metalor‐ganic chemical vapor deposition is reported. Trimethylindium‐trimethylphosphine adduct was used as In source in this study. From X‐ray and SEM examinations, good crystallinity InP epilayers with mirror‐like surfaces can be grown directly on (100) and (111)p‐type Si substrates. Carrier concentration profile shows that the carrier distribution in the InP epilayer is very uniform. The efficient photo‐luminescence compared with that of InP homoepitaxy shows the good quality of InP/Si epilayers.

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677069

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A new type of controller called proportional integral minus delay (PIMD) controller was first proposed by the author. It is shown that, in addition to exhibiting almost the same characteristics as the conventional proportional plus integral plus derivative (PID) controller, the PIMD controller is superior in that it is less sensitive to high frequency noise. Therefore, it seems that an appropriate PIMD controller is a good replacement of a PID controller. In this paper the moments matching method is proposed to design a PIMD controller such that the resulting closed‐loop system may track the given reference model. Since the moments matching method makes the mean, variance, and skewness of the impulse response of the system equal to those of the reference model, the satisfactory design of a PIMD controller is expected. This method is also a computer‐oriented approach.

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677070

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Nonthermal ASDEX plasmas created by injection of lower hybrid waves have been analyzed by simulating the observed electron cyclotron emission (ECE) spectra with the help of a two‐component (low‐ and high‐energy) plasma in the perpendicular slab approximation. Numerical simulations confirm the two‐component description of the nonthermal discharges and provide estimates of the population and energy of the suprathermal electrons.

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677071

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A coordinate perturbation technique is applied to solve the thermal entry problem for power‐law fluids flowing in a pipe with viscous dissipation effect. Constant wall heat flux is considered. Up to the second order analytical solutions in terms of Airy function are obtained. The zero‐order solution is trivial. The first order solution is the classical Leveque solution. The results obtained in this work are analytical in form and numerical calculation is not necessary.

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677072

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Nesting is an important feature in structure query languages (SQL) of the relational database. However, the nesting of query blocks sometimes results in bad performance while evaluating such a query if no effort is contributed to it. A new algorithm to transform a nested query into an equivalent one which is more efficient to process is presented in this paper. The correctness of the transform algorithm is shown as well as the complexity is analyzed in this paper.

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677073

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677074

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0253-3839    

DOI:10.1080/02533839.1988.9677058

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor