电工中的不可逆变换与广义逆

电路和电机分析中,一些变换常是长方阵而非方阵.本文引用广义逆矩阵理论,对长方阵进行可逆变换,直接求解电工、电机分析中的奇异方程.     

The Role of Systems Engineering in Electrical Engineering Education

Systems Engineering, including its subspecialties, has much to offer and is a needed component in electrical engineering education. Inclusion of efforts in systems engineering philosophy and methodology within the electrical engineering curriculum can do much towards the enhancement of student achievement of technical and management proficiency and, perhaps more importantly, towards achievement of appreciation of the vital role of the human element in resolution of large scale problems through technology. A framework for an introductory systems engineering course is described.     

The Changing Role of the Laboratory in the Electrical Engineering Curriculum

Over the past years, the electrical engineering laboratory has developed from an apprenticeship into a stereotyped demonstration program. In general, this program has been held in low esteem by both faculty and students. An attempt is made here to present the beginnings of a program which will lead to a solution of the laboratory dilemma. A brief historical review of the development of the laboratory in electrical engineering curriculums is given, and the Projects Laboratory and the Undergraduate Research Participation Program that have evolved at the University of Oklahoma are described. Two examples of typical student work performed in these advance programs are presented. At the present time, these programs are restricted to upper-division students. These are usually seniors, though outstanding juniors may participate. As the program continues to grow, and faculty experience is gained, it is expected that the laboratory philosophy described here will make itself felt downward through the cirriculum.     

电工理论中运用门限函数的计算方法

通过单位阶跃函数定义了由门限界定了自变量域的门限函数,从而解决了单位阶跃函数描述分段函数时需用函数代数和来表征分段自变量域的问题,而且门限函数内含了单位阶跃函数,是对单位阶跃函数的扩充,提高对问题描述的灵活性;同时在数学规范的基础上提出有关门限函数的性质和运算法则,使得电工理论在运用门限函数时其运算处理更为简便;文中具体讨论了线性动态电路对多域分段激励的响应求解问题．对门限函数在电工理论中的应用做了初步的探索．     

浅议建筑工程电气节能的主要方式

首先阐述了建筑电气节能的必要性以及建筑节能领域政府可以采取的措施。然后从建筑照明节能、建筑动力设备节能、电源节能3个方面详细介绍了如何实现建筑内的电气节能。     

Important Role of the Hall Effect Measurement System in a Modified Course of Materials in Electrical Engineering

The course “Materials in Electrical Engineering” is a core course in the Mechatronics curriculum at the Faculty of Technical Sciences, University of Novi Sad, Serbia. In the past, this course was comprehensive and mainly theory-based. Teaching methods used in this course had not been changed for many years, and were mainly based on a traditional approach. They were therefore often outdated, and boring for students. In addition, the lack of modern materials characterization equipment was a significant weakness of the course in its early stages. This paper presents the main aspects of the modified course, which features a greater inclusion of modern equipment in its teaching methodology; in particular it introduces the Hall effect measurement system as an indispensable characterization technique in education, research and in the semiconductor industry. This paper also describes how students can be taught to use the Hall effect measurement system to determine the structural and electrical characteristics of different materials. Finally, students' feedback and observations on the modified course and the applied teaching methodology are discussed.      

Electrical Engineering at the Crossroads

The rapid growth of computer sciences is presenting electrical engineering with a serious problem. Should electrical engineering departments adapt their curricula to meet the special needs of computer engineers and scientists or should they leave the field to computer science departments? An argument is made in favor of establishing special programs in computer sciences within electrical engineering, and a new curriculum in electrical engineering at Berkeley, which includes such a program, is outlined.     

工程力学专业课程体系初探

工程力学专业人才培养目标及课程体系建设直接关系到力学人才培养的质量,备受力学教育工作者的关注.本文探讨了大庆石油学院工程力学专业课程体系建设方面的问题,主要包括制定培养目标、完善理论课程体系的建设,改革实践课程体系及建立创新学分等四个方面.     

理性力学中客观性量的广义判别方法

判别理性力学中的客观性量有两种方法,其一,是C.TRUESDELL,郭仲衡等绝大多数理性力学学者所采用的客观性量的判定准则。其二,是R.HILL提出的判定准则。现多数文献采用第一种判定准则并认为：Green变形张量,Green应变张量,变形梯度张量,第一、二类Pio-la—Kirchhoff应力张量,不是客观性量。通过对理性力学中客观性量深入研究,提出了客观性量的广义判定准则和新的论点和论据。根据新的论点,证明上述量应该属于客观性量。     

Quantum Theory in the Electrical Engineering Curriculum

An approach to quantum theory tailored for those students whose backgrounds include relative strength in classical electromagnetic field theory but less in classical mechanics is described. Rather than building quantum theory by following the historical steps, as is often done, the technique is to approach the subject directly from a background knowledge of electromagnetic field theory. The approach uses the postulates that the Maxwell equations are always valid for point charges, that a form of steady-state cosmology is correct, and that the superposition principle is applicable to statistical processes. The model permits a direct transition from electromagnetic field theory to quantum theory. It is self-consistent and based upon currently acceptable physical postulates. It meets the epistemological objections against the orthodox interpretation that Einstein raised and that have never been adequately answered. It does not fall into the class of proposed interpretations that Wigner showed to be inconsistent with the wave theory.     

Films in Electrical Engineering Education

Engineering educators have had to rely increasingly on theoretical models that represent broad abstract relationships or laws which preserve their validity despite technological change. Carefully produced films afford the opportunity to relate the abstract with the real world and to assist the instructor in presenting material to his students that he could, only with great difficulty, produce himself. Under a grant awarded by the National Science Foundation, the National Committee for Electrical Engineering Films (NCEEF) has completed or has in production films on a) fields, forces, and matter, b) traveling waves on transmission lines, c) harmonic phasors, d) linearity, and e) antenna and radiation patterns. Additionally, films on electrical instruments, computers, modulation transients, and stroboscopic techniques are in the planning stages. The Committee has also sponsored a compilation with reviews of existing films. Because of the difficulty of visualizing electric and magnetic fields, and circuit quantities such as voltage, current, charge, etc., the NCEEF has sponsored a conference and produced a film on computer animation of motion pictures, which will consist essentially of excerpts from existing films of both industrial and educational organizations. As a result of the work of the Committee, there now exists a coordinated national effort designed by electrical engineering educators to produce films which will serve as useful adjuncts to electrical engineering education.     

Power Electronics in Electrical Engineering

The area of Power Electronics consists of groups of topics which should now form part of a program in Electrical Power Engineering. Some of these topics can be introduced by modifying part of the standard curriculum in Electrical Engineering; others require the introduction of new courses. Desirable modifications are described and new courses in Thyristor Circuits are outlined. It is acknowledged that the number of courses required to give students an adequate knowledge of Power Electronics may be considered excessive for an undergraduate program in that they could result in a level of specialization which may be undesirable. In this case the main group of courses on Thyristor Circuits would be part of the graduate program with one introductory course included in the undergraduate program.     

Situation Problems in Electrical Engineering

During the past few years, I have developed a couple dozen problems in Electrical Engineering which are somewhat unusual. The problems are written around a situation similar to case studies as employed in Business Schools. I try with some introductory comments to project the student into a "real life" situation and then lead him through a series of step-at-a-time solutions. One of the purposes of the situation problems is to heighten the student's interest and thereby increase his motivation. Additionally, the student learns to follow through a lengthy line of reasoning and related engineering design. Since the problems frequently require the full use of broad prior knowledge, the student learns to integrate together a number of subjects. In this respect, the problems help to augment his laboratory experience. The situation problems typically require a considerable amount of time both by the student in solving and by the instructor in grading. Occasionally, the problems are done in groups or as class exercises. The problem answers follow sequentially and initial errors are propagated. This is justified as being a "real life" experience and therefore valuable to the student in teaching him to work accurately The over-all student reaction has, I feel, been quite favorable. In discussing the solutions, the instructor has an opportunity to interpolate numerous comments, as appropriate, concerning analysis, approximations, and engineering design philosophy. The following situation problem on "Transistorized Low-Frequency Class C Amplifier" was recently prepared.     

Electrical Engineering Education in 1975

Out of the needs of man brought about by automation, the population explosion, the expansion of human expectations, continued peace in the world, and scientific discovery are derived the influences on engineering practice and electrical engineering education for the next decade. Scientific discovery and the provision of quantitative models for environmental systems will have a profound effect on the profession. In engineering education, research in pedagogy, especially in terms of the expanded use of audio-visual methods and computer-aided instruction, will alter the teaching of engineering as it is known today.     

Electrical Engineering Education in India

This paper traces the history of development of technical education in India, with particular reference to electrical engineering. The structure of the present education system is outlined and an account is given of the facilities available for the education of craftsmen, technicians and technologists. Main features of the various educational programs and the requirements for the award of degrees in engineering are explained. The paper also focuses attention on some of the current problems in technical education in India.     

Electrical Engineering Education in Hungary

The Hungarian People's Republic is an East European country whose conditions and educational systems are not well known to Western countries. This article presents an overview of Hungary's general background and her technical education system. The organization of the Budapest Technical University ("Hungary's greatest university") and the curricula of its Faculty of Electrical Engineering are discussed in detail. The growth and accomplishments of Electrical Engineering education, formally began only in 1949, have been impressive.     

Electrical Engineering Education in Israel

The Israeli engineering educational system, though essentially based on European and American traditions, is influenced by the country's geographical, ethnic, political, and economic conditions. Besides the well-established Technion, the newer Tel-Aviv University and Ben-Gurion University are also offering degree programs in electrical engineering. The article discusses both academic and non-academic programs, including continuing education for engineers, and describes some characteristics of the Israeli EE student and the professional environment of faculty.