标准促进行业发展企业仍需有所担当

产品标准是一个行业发展的基础,而标准背后则是企业强大的核心竞争力和自觉为社会、人民利益严格要求自身的决心和毅力。在国民经济发展的大环境下,与生活生产相关的每一个产业都有无数规则控制着中国产业的发展,电信,网络,钢材,饮料,物流,背后是一长窜名字摩托罗拉,英特尔,可口可乐,沃尔玛,他们就是规则的制定者。规则是什么?规则就是标准,就是不战屈人之兵。同样在中国的家电市场上,面临标     

中国火电建设发展史(2)

"中国火电建设发展史"原系"中华人民共和国电力工业史"的一部分,该书由10多位资深专家分工撰编多年,但迄今未能付梓出版。现将其中"火电建设"部分单独刊出,本刊以连载方式发表,以飨读者。写史要求实事求是,秉笔直抒,总结经验教训,探讨发展规律,以史为鉴,鉴往知来。火力发电在我国电力工业史中始终处于主导地位,在21世纪的电力发展中,火电建设仍将处于主导地位,愿全国火电建设者,不懈努力,为全面建成小康社会和实现四个现代化做出自己的贡献。     

电力科技论文中常见的标志词

电力科技论文中常见"分析""应用""措施"等标志词,这些标志词由于缺乏对论文主题的专指性,只是泛指,起不到关键词应有的标引和检索作用,所以在选取关键词时一定要注意避免使用这些标志词,如:处理,措施,对策,方法,分析,改进,改造,建议,探讨,问题,研究,应用,影响,原因。但是一些名词由于有专指范围所以可用为关键词,如:防护措施,技术改造,技术报告,技术标准,技术鉴定,技术创新,技术管理,技术监督,技术经济指标,技术设计,技术水平,技术引进,技术政策,技术转让,故障分析,故障检测,故障排除,故障信号,事故保险,事故处理,事故分析,事故纪录。     

电力人影像/书画

<正>作者简介李颖华,字慧初,号青禅,古泉居士,别署静悟庐,祖籍江苏丰县,1962年生于枣庄。主攻山水画,兼习花鸟画、书法,授业于中国美术学院张伟平(仁量)山水画研修班,并参加中央美术学院黄润华(井冈山)、中国文联贾又福(太行山)山水画写生与创作研讨班。现为中国电力美术家协会会员,山东省美术家协会会员,枣庄市美术家协会常务理事,枣庄画院画师。     

逝水流年 摄影凝固时光储存回忆——讲述五位大学生结缘摄影的故事

有些人,有些事,有些记忆,我们错过了,我们遗憾了,留下的或许就只有感叹。然而,在当今昌明的科技之下,摄影,也许就是我们弥补遗憾或者说回忆过去的最好方式了!当神经紧绷,心灵空虚之时,翻出你过往记忆,细细体会那些年,那些人和那些事。当我们想明白这一切不过就是过眼云烟的时候,     

杨甫臣:深山里的木莲花

风大,吹散了高天上的流云,吹枯了草木层林,吹皱了寒水群 太行深处,海拔1200多米,隆冬时节,天地肃杀,见不到一丝绿色,滴水成冰.山高,高得连善于攀岩的山羊都会从碎石上滚下来;路陡,不生高树,只有荆刺灌木围裹其上.鸟不飞,兽不走.     

人生若只如初见——记河北涞水供电公司三坡供电所所长张宏

前任所长张战安去世的当天晚上,张宏梦见了他. 在梦里,这位42岁的师傅穿着平日里最喜欢的夹克,戴着安全帽,拎着工具,满脸笑容地从所里出来.大门口,张宏和师傅遇见,两个人并肩而立看着连绵群山上的线路,远处苍茫一片.张宏问师傅要去哪里,师傅把工具交给张宏,说:"我在这里呆了7年,该走了,接下来的事情,要辛苦你了."     

人语

正"虽然我知道今天的小米说成功为时过早,谈击败苹果为时过早,但梦想总是要有的,万一实现了呢?谈到梦想的实现,我最近还有一句话挺出名的,也是我抄来的,叫‘台风来的时候,猪都会飞’,听说过吗?你要成功了,要找台风口,当台风飞过来的时候,猪都可以飞。你想是猪都可以飞,当然了,这个话我其实想表达两层的意思,尤其是给在座的同学们,我觉得第一个,没有坚实的基本功,没有勤奋是成功不了的。我觉得第二点,有了勤奋,有了坚实的基础,也不一定能成功,还     

云南玉溪中汇电力设备有限责任公司

云南玉溪中汇电力设备有限责任公司前身为玉溪供电局开关厂,创建于1986年9月,位于聂耳的故乡玉溪市中心城区,占地面积6536平方米,注册资金1335万元,年产值7000万余元,中汇公司于2004年2月10日在玉溪市工商行政管理局登记注册,公司下设办公室,生产技术部,财务部,业务部,质检部,工程部,冷作车间,装配车间。     

一起保安段失电导致600MW机组跳闸引发的思考

国华宁海电厂2号机组(600MW)共配备6台磨煤机,从下层到上层依次编号为A,B,C,D,E,F。其中,A,B,C磨煤机电源取自6kVA段,D,E,F磨煤机电源取自6kVB段,A,B,C磨煤     

THEORY OF A SYNCHRONOUS MACHINE WITH A SELF-LEVITATED ROTOR

ABSTRACT

The properties of an ironless rotor synchronous machine (SM) with null-flux windings on the stator and radial displacement of the rotor are considered. The system of the SM equations are derived. These equations are based on an analytic representation of a three-dimensional excitation field and on considering the SM as a dynamic system with three generalized coordinates, two of which are the coordinates of the Center of rotor mass and one is the angle coordinate which characterizes the rotation of the rotor on its own axis.

On the basis of the solution of the equations we obtain the relations for all the basic quantities: radial and centering forces, radial suspension stiffness and parameters of the null-flux circuit. They characterize all the properties of the SM in the state when the rotating rotor undergoes a radial displacement.     

A STRATEGY TO ISOLATE A SWITCHING DEVICE FAULT IN A CURRENT REGULATED MOTOR DRIVE

ABSTRACT

In this paper a new, improved induction motor control topology is proposed which allows for continuous, disturbance-free operation of the drive with a failed short-circuited switch in one leg of the inverter. The analysis of this control strategy and the computer simulation are explored. The experimental results from hardware are attached to verify the simulation results. A complete control strategy combined with short-circuit fault and open-circuit fault is also included.     

ANALYSIS OF A GRID DIPOLE ARRAY PLACED INSIDE A WAVEGUIDE CAVITY WITH A RECTANGULAR COUPLING APERTURE

The circuit and coupling properties of a dipole grid array placed inside a rectangular cross-section waveguide are analysed when also a rectangular aperture is used to couple the resonator energy into a semi-infinite waveguide. A Green function approach is employed to determine the current distribution on the dipole elements by solving an integral equation and taking into account the boundary conditions on the rectangular cavity walls. Both mutual and self-impedance terms are calculated for the dipole grid array, and the effects of the rectangular coupling aperture are also examined. © 1997 by John Wiley & Sons, Ltd.     

关于量化和A/D-D/A的讨论

数字、量化、量化效应、模拟、模拟量、A/D转换、D/A转换是计算机控制工程和控制理论上的常见概念.静心推敲,发现有不少流行性的误解.例如：不是“量化”而是截尾或四舍五入,不是“数字量”而是bit量,不是“模拟量”而是物理量等.     

单片机在转速测速器中的应用

介绍一种由单片机８９Ｃ５１构成的高精度多功能转速测试器的工作原理,设计思想,软硬件配置及应用方法。该测速器是通过采集光电编码器发出的脉冲信号由单片机记数,数据经内部程序计算、分析、处理后,按实际要求做出相应的继电器输出,模拟量输出和串行口输出。它的实时转速值通过ＬＥＤ显示非常方便直观,还可以通过按键显示瞬时转速值,事先设定的转速值。它具有超速报警与串行通讯口功能,还可以配接不同线数的光电编码器（指     

A VISION OF FRAM AS A FUSION MEMORY

ABSTRACT

The purpose of this paper is to attempt to find a plausible solution for a high density FRAM (Ferroelectric Random Access Memory). To complete this, firstly, we give a very brief but an important review of how FRAM technologies have been evolved during the past many years. Secondly, not only are a few examples demonstrated in terms of how a FRAM-embedded system is advantageous when adopted in a system but it is also put forward how FRAM can play an essential role in a fusion memory. Finally, several process technologies for integrating a reliable high-density FRAM are mentioned, accordingly resulting in very reliable cell-charge populations after full integration, along with wafer-level reliabilities.     

A Coupled-Reactor-Commutating Sinusoidal-Wave Inverter

A coupled-reactor-commutating sinusoidal-wave current-source inverter is described. The inverter consists of two coupled-reactor-commutating inverters. By superposing the output currents of these two inverters, output currents of a 180° conducting angle are formed, and are controlled in order to achieve a sinusoidal waveform. The operation and the control scheme of the inverter are described, and experimental results are presented. Compared with the usual PWM voltage-source inverters, the on-off frequency of each chopper may be decreased almost to one tenth of that of the PWM inverter.     

A THYRISTORIZED A.C. VOLTAGE CONTROLLER WITH SINUSOIDAL OUTPUT

ABSTRACT

In this paper a thyristor voltage controller suitable for high power loads is presented. A load voltage higher than that of the supply can be obtained without difficulty. Thyrsitor switches are used in a secondary circuit such that voltage control is achieved via flux level variation of an output coil. The load voltage is varied in steps which can be made as narrow as desired but distortion and switching transients in the load circuit are avoided. Theoretical and experimental results of a prototype are presented and compared. If the load is an inductor, the proposed arrangement can be used as a variable reactive power compensator without harmonic current injection into the mains supply.     

关于调度会议电视及其传输信道的研究

介绍了国内外会议电视发展的情况，着重阐述会议电视的功能和调度会议电视的特点，会议电视系统的组成，并对几种传输方式进行探讨和比较，提出利用数字微波备用信道作为调度会议电视系统的通道，以获得较大的经济效益。     

A Fourier Series Experiment

An experiment is described illustrating the fact that an approximand to a periodic function in the form of a truncated Fourier Series minimizes the mean-squared error. The experiment is implemented on an analog computer wherein the first three components of a periodic wave are generated and their amplitudes (and phases to a certain extent) are adjusted to minimize the squared-error integrated over one period. Sources of error are discussed briefly, and experimental technique is outlined. Verification of the principle of minimization is obtained to within a few percent in all cases.