谐波的危害和预防措施

阐述了高次谐波对电力系统电能质量及发、供、用电设备造成的影响和危害,介绍了无源滤波器、有源滤波器、混合有源滤波器、智能滤波器的原理,并对这几种滤波器进行分析比较。     

并联型有源电力滤波器线电压控制

有源电力滤波器是一种新型的谐波电流、无功功率和不平衡分量动态补偿设备,由于设备本身高电压大电流高频率控制运行,设备功耗大,稳定温度高.为了保证设备稳定可靠运行,本文定量分析有源电力滤波器功耗,提出改进的线电压控制方法,降低有源电力滤波器的等效控制开关频率,提高了直流侧电压利用率.     

浅谈供电系统中谐波的影响及其治理

介绍了谐波的基本知识及产生原理，分析了谐波对供电系统的危害，并通过比较无源滤波装置、有源滤波器及混合型有源滤波器等几种谐波治理方式，探讨了对谐波治理最有效并最合理的方式。     

串联型有源电力滤波器在智能建筑谐波抑制方面的应用研究

针对智能建筑谐波的抑制问题,介绍了一种串联型有源电力滤波器系统,通过对其系统结构和控制电路的分析研究,设计选择参数并对系统进行了建模和仿真研究.结果表明,这种串联型有源电力滤波器可对智能建筑中的谐波进行较好的补偿.     

单周期控制的三相有源电力滤波器分析

介绍了单周期控制的三相有源电力滤波器，它克服了传统LC滤波器的一些主要缺点，认为这种滤波器具有良好的动态性和实时性，将在冶金行业中得到广泛应用。     

电解铝厂谐波治理研究

以某电解铝厂实际运行时出现的问题出发,根据电网实际结构进行电能质量测试,发现110kV母线上电能质量达到要求,但整流变压器器2次侧的5次滤波通道有过流现象。结合电能质量治理新技术,采用混合有源电力滤波器进行治理,并给出了具体参数,治理效果达到要求。     

有源滤波器电流检测方法

对有源滤波技术的产生和历史发展作了简要回顾,详细讨论了基于瞬时无功功率理论的电流检测方法,并简要介绍了其它电流检测方法,为有源滤波器设计中电流检测算法的选择提供了参考.     

浅谈高次谐波的抑制

本文以谐波治理为主线，对各滤波方法进行了分析比较，阐述了有源滤波器的工作原理、结构特点及应用方法，并对ＬＣ滤波器设计的有关问题时行了探讨。     

谐波抑制的设计方法探讨

以谐波治理为主线，对各滤波方法进行了分析比较，阐述了有源滤波器的工作原理、结构特点及应用方法，并对LC滤波器设计的有关问题进行了探讨。     

有源电力滤波器对电弧炉的电能质量改善

通过将电弧炉的非线性时变电阻模型、波动性模型以及混沌模型线性叠加,在多个原有电弧炉模型的基础上建立了可以根据实际情况和个人需求进行任意调节的综合电弧炉模型,此模型通过参数设计可以表现出电弧炉各方面的特性,通过调节还能够突出表现电弧炉某一方面的特点。应用有源电力滤波器,对所提出的综合电弧炉模型进行了谐波抑制等电能质量方面的改善。应用matalb软件进行了仿真,结果表明理想有源电力滤波器基本可以保证电弧炉不对电网电能质量造成任何影响。     

American Psychological Foundation contributors: 1981.

The American Psychological Foundation (APF) was established in 1953 to receive gifts from psychologists who wish to contribute to the advancement of psychology as a science and a profession in the service of knowledge and the welfare of the people. Through its awards program, the foundation honors annually a senior psychologist who in his or her career has made distinguished contributions to research and scholarship (the Gold Medal Award), and it also recognizes outstanding achievements in teaching and in interpreting psychology in the public media (books, radio, magazines, newspapers, television). Through its small-grants program, the APF supports activities of importance to psychology that would otherwise go unfunded. This paper presents the names of all whose contributions to the APF were received in 1981. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Floyd H. Allport: American Psychological Foundation Gold Medal Award: 1968.

At the annual meeting of the American Psychological Association in 1968, the American Psychological Foundation (APF) announced the recipient of the APF Gold Medal Award. The presentation was made by Kenneth E. Clark, President of the APF, to Floyd H. Allport. As professor of social and political psychology in the Maxwell Graduate School of Citizenship and Public Affairs, Allport directed the first doctoral program in social psychology in the US. Although Allport's experimental work first appeared in 1920, his major impact came with the 1924 appearance of his Social Psychology. His interests in the late 1920s and early 1930s were the investigation of social attitudes and the study of institutional behavior. Allport's contributions have had two major consequences: (a) he shaped the field of social psychology as an area concerned with the basic problems of social influence in which measurement of human behavior is the primary focus, and (b) he furnished the rationale and the example for the behavioral trend in the social sciences. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Distinguished teaching in psychology award.

The APF Distinguished Teaching in Psychology Award recognizes an outstanding career contribution to the teaching of psychology. Peter S. Fernald is the 1993 recipient of the APF Distinguished Teaching in Psychology Award. This article includes a citation and biography of Peter S. Fernald. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of daily topical fluoride gels on resin composite degradation and wear

OBJECTIVES: This in vitro study compares the effects of professional and consumer-applied topical fluorides on the weight, wear resistance and surface appearance of a resin composite containing barium boroaluminosilicate glass filler particles. METHODS: Prior to wear studies with a pin and disc apparatus, specimens were immersed for 6 min 10 times in water, three consumer-applied topical fluorides (1.1% NaF, 0.4% SnF2, or 0.5% APF gel) or a professionally applied topical fluoride (1.23% APF gel). Specimens were weighed before and after each immersion. Following wear studies, the specimen surfaces were visually evaluated using scanning electron microscopy. Weight changes were analyzed for significant differences using one-way ANOVA and Duncan's multiple range test (p = 0.01). Values of wear parameters were ranked and tested for significance using one-way ANOVA with least squares mean contrast (p = 0.05). RESULTS: Significant differences were found in the weight loss of specimens treated with different fluoride agents: 1.23% APF = 0.5% APF > 0.4% SnF2 > 1.1% NaF = water (p < or = 0.0001). Significant differences in initial wear depth (S(i)) occurred in the following samples: 1.23% APF > 1.1% NaF = 0.5% APF (p = 0.04). Scanning electron micrographs showed variable wear tracks on the specimen surfaces. The specimen surfaces outside the wear track were smooth for those treated with water or with NaF; the surfaces outside the wear track of specimens treated with APF showed extensive loss of filler particles. SIGNIFICANCE: Topical APF agents caused extensive loss of filler from the resin composite specimens whereas 1.1% NaF caused the least damage. Although significant differences in surface wear resistance were detected, clinical studies are needed to determine the effect of topical fluorides on the properties of this resin composite.     

American Psychological Foundation: Gold Medal and Distinguished Science Writing Awards 1965.

At the Annual Meeting of the American Psychological Association (APA) in Chicago, Illinois, on September 6, 1965, the American Psychological Foundation (APF) announced the recipients of the APF Gold Medal Award and of the APF Distinguished Science Writing Award. The APF was established in 1953 to receive gifts and bequests from psychologists wishing to make financial contributions toward the development of psychology as a science and as a contributor to human welfare. One part of this program is the presentation of the Gold Medal Award and the Distinguished Science Writing Award. Heinrich Klüver, the Sewell L. Avery Distinguished Service Professor at the University of Chicago, was named recipient of the 1965 APF Gold Medal Award. On this same occasion the 1965 award for Distinguished Science Writing was presented to Earl Ubell, the Science Editor of the New York Herald Tribune. Presentations were made by Meredith P. Crawford, President of APF. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

软启动技术在供水系统中的应用

介绍了软启动技术在供水系统中的工作原理，并以实例说明了该技术的实用性。     

American Psychological Foundation Contributors, 2005.

The American Psychological Foundation (APF) was established in 1953 to promote psychology and to help extend its benefits to the public. Today, APF continues its mission to advance the science and practice of psychology as a means of understanding behavior and promoting health, education, and human welfare. This article provides a list of the donors that APA would like to thank who contributed to the Foundation in 2005. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

American Psychological Foundation 1977 Contributors.

This article describes the awards and small-grants programs of the American Psychological Foundation (APF), which was established in 1953 to receive gifts from psychologists who wish to contribute to the advancement of psychology as a science and a profession in the service of knowledge and the welfare of people. Through its awards program, the Foundation honors annually a senior psychologist who in his or her career has made distinguished contributions to research and scholarship (the Gold Medal Award), and it also recognizes outstanding achievements in teaching and in interpreting psychology in the public media (books, radio, magazines, newspapers, television). Through its small grants program, the APF supports activities of importance to psychology that would otherwise go unfunded. The Foundation's program depends on the concern and generosity of psychologists. Enclosed are a list of the names of all whose contributions to the APF were received in 1977. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

APF Gold Medal Awards, Distinguished Practice of Psychology Award, and Distinguished Teaching of Psychology Award.

The APF Gold Medal Awards recognize distinguished and enduring records of accomplishment in three areas of psychology. The 1994 recipients are C. H. Lawshe, the Gold Medal Award for Life Achievement in the Application of Psychology; Bernice L. Neugarten, the Gold Medal Award for Life Contribution by a Psychologist in the Public Interest; and Endel Tulving, the Gold Medal Award for Life Achievement in Psychological Science. The APF Distinguished Practice of Psychology Award is a special 1994 award that recognizes an outstanding career contribution to the practice of psychology. Ronald E. Fox is the 1994 recipient of this award. The APF Distinguished Teaching of Psychology Award recognizes outstanding career contributions to the teaching of psychology. This year (1994), there are two recipients for this award; Harry P. Bahrick and Patricia Keith-Spiegel. The citations, biographies, and selected bibliographies of the awardees are presented here. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

American Psychological Foundation Gold Medal And Distinguished Science Writing Awards 1967.

At the Annual Meeting of the APA in Washington, D. C., on September 4, 1967, the American Psychological Foundation announced the APF Distinguished Science Writing Award. Presentations were made by Anne Anastasi, President of the APF. This year the award is given jointly to: Gay Gaer Luce and Julius Segal for their book entitled Sleep--published by Coward-McCann. (PsycINFO Database Record (c) 2010 APA, all rights reserved)