电阻、电容器、镇流器、启动器、变压器

LCD背光照明四灯管CCFL电子变压器;基于无气隙电抗器的路灯降压节电器;浅谈串联多灯电感镇流器（上）;日光灯镇流器温度变化情况的研究;电子镇流器中的传导电磁干扰（EMI）分析     

Users' Needs Lighting, Start-Up Power, Transportation, Mechanical Utilities, Heating, Refrigeration, and Production

The needs for emergency and standby power to enhance industrial and commercial power systems are frequently left wanting due to ignorance of the needs or of the systems available to satisfy the needs. This paper discusses various situations which require or desire emergency or standby power and mentions suitable systems for each application. The areas discussed include lighting, start-up power, transportation, mechanical utilities, heating, refrigeration, and production.     

Grades, Quizzes, Motivation, and Computers

The following paper describes the use of a simple FORTRAN computer program that may be used to determine course grades. The program is based on processing a set of IBM punched data cards. Each card contains the name of a student and all of his grades, including the final examination grade. The program may also be used to predict the final examination grade, based on previous quiz grades, and then, in turn, to predict the final course grade. It is thus possible to use this program periodically throughout the entire semester in order to provide the student, as well as the instructor, with a measure of his progress.     

光、城市、生活、未来……——世博轴及地下综合体工程艺术灯光景观

工程介绍 世博轴及地下综合体工程（简称世博轴）位于浦东世博园核心区。南起耀华路,跨雪野路、南环路、北环路、及浦明路,到滨江世博公园。     

A new soft-switched, thyristor-based, regenerative, quasi-resonant,current regulated inverter

A variety of soft-switching techniques have been proposed to reduce the switching losses and EMI problems that occur with higher switching frequencies in hard-switched converters. In this paper, a new, quasi-resonant, soft-switched, three-phase inverter is presented which uses 12 thyristors as the power electronic switches, and hence has potential for use in high-power applications. The converter is fully current-regulated, suitable for high-performance motor drive applications, and is capable of 4-quadrant operation to allow regeneration back into the DC supply. The operation and the control of the inverter are described in detail and simulation and experimental results are presented     

Dual-rotor, radial-flux, toroidally wound, permanent-magnet machines

A novel machine family-dual-rotor, radial-flux, toroidally wound, permanent-magnet (RFTPM) machines-is proposed in order to substantially improve machine torque density and efficiency. After the principles of operation, configurations, and features are discussed, the machine design and optimization guidelines are given. A prototype has been designed, built, and tested. The measured torque density of the prototype, which well matches the design value, is almost three times of that of the induction machine with the same power of 3 hp and speed. Meanwhile the efficiency is still kept high and the material cost is kept low by using ferrite magnets. Three novel approaches are proposed to reduce the cogging torque in the RFTPM machines, whose validity is verified by finite-element analysis results and experimental measurements.     

Industrial system grounding for power, static, lightning, andinstrumentation, practical applications

Practically every structural steel building erected for industrial use incorporates reinforcing steel bars installed in the concrete footings. This, without any additional effort, constitutes a grounding electrode. The quantity of electrodes is directly related to the building area. When the structural steel framework is erected and interconnected, these electrodes are also interconnected in a parallel arrangement. Similarly, high-voltage metal transmission towers are installed using a metal footing base embedded in a concrete filled hole. The four tower legs are effectively in parallel and offer an adequate low ground resistance such that additional electrodes are generally not required. This brings us to the main point: the reinforced concrete footings, reinforced concrete grade beams, and other reinforced concrete structures provide, with a little work, an effective, reliable, and cost attractive system grounding vehicle     

化合物、混合物、复合物

"化合物"(compound):它是由两种或两种以上的单质按一定比例用化学键(离子键、共价键)结合在一起构成的另一种物质,其组元元素已完全失去原来的性状.例如NaCl、CH4、MnFe2O4(锰铁氧体)等.还有一种化合物称为金属间化合物(intermetallics),它不是通过价键结合在一起的,顾名思义,它是金属原子彼此间形成的二元或多元化合物的总称.因此俗称合金.稀土永磁材料SmCo5、Sm2Co17和Nd2Fe14B即属于这类化合物.其中B是半金属.金属间化合物又可分为三类:电子金属间化合物(如CuZn、CuZn2)、配位多面体金属间化合物(如Fe-Cr、Laves相Cu2Mg)和电化学金属间化合物(如GaAs、GdS).为方便计,将轻原子(H、C、N、O)侵入金属晶格间构成的填隙型化合物(例如永磁材料Sm2Fe17Nx)也列入金属间化合物.