高压交流变频调速技术分析及应用

针对我国高压电机设备效率低问题,提出并分析了高压交流调速技术,得出直接高-高型变换高压变频调速技术是最先进的高效节能技术,并结合具体应用计算分析了其高节能效率.     

A 155 Mbps laser diode driver with automatic power and extinction ratio control

An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.     

论尼采艺术价值观之变迁

尼采早期认为艺术具有至高无上之价值;中期彻底否定了前期艺术价值观,认为艺术有害清醒的、自立自主的人生,提出科学将取代艺术;而后期重新肯定艺术具有至高无上之价值.尼采艺术价值观的变迁与他对理想人生、真理、文化、人类未来等重大问题的思考密切相关.     

Editorial Power/Authorial Suffering

In this article, I analyse the publish or perish enterprise and in particular the origins of editorial power/knowledge. My actor-network analysis shows how tenure, promotion, and salary decisions apparently unrelated to editorial decisions are important elements that accrue power/knowledge to editors of particular journals. What my actor-network analysis does not show, and which I therefore analyse from a subject-centred perspective, is the other side of editorial power/knowledge: authorial suffering. I suggest that the structure of our science education discipline necessitates a particular commitment to the responsibilities and obligations of editors and reviewers to the authors, particularly the newcomers, and therefore to the production and reproduction of science education.     

基于输出电压波形的电路故障诊断

论述了晶闸管相控变流器故障产生的原因。通过对电路故障类型的详细分析,提出一种基于示波器在线检测的电力电子电路故障诊断方法。     

提高教师继续教育效果的几点思考

教师继续教育对提高中小学教师素质有着重要意义,提高教师继续教育效果可从三个方面努力:合理确定教师继续教育的目标;丰富培训形式,使教师继续教育灵活多样;打造核心竞争力,彰显培训机构资源整合力。     

党的先进性源于历史并为历史所验证

先进性是马克思主义政党的一个突出特点,它是由党的性质和宗旨所决定的。党组织的先进性与党员个体的先进性是辨证统一的。从党诞生的历史看,党的先进性体现于整个新民主主义革命的进程之中,这是历史发展的必然趋势。党的先进性是党的执政之源,更是党的领导核心的保证。     

基于新媒体的高校思政教育话语权重构研究

在信息技术快速发展和迭代的过程中,新媒体形态的出现令思政教育活动充满了活力与生机。文中分析了新媒体视域下的高校思政教育策略,以期利用新媒体提高高校学生的思想素质和道德水平,重构高校思政教育话语权。     

射频强场电磁环境试验系统可行性研究

从高技术战争特点和我军武器装备发展需要出发，论述了建设射频强场电磁环境试验系统的必要性。从射频功率产生系统和射频场形成装置两方面，详细分析了在实验室内和野外电磁环境试验场建设射频强场电磁环境试验系统的技术可行性，计算确定了射频宽带功率放大器的技术指标，配置了辐射天线并进行了选型分析。结果表明：建设200V／m以上的射频强场电磁环境试验系统，满足武器装备电磁环境效应试验的需要具有技术可行性和经济合理性。     

论宪法诉讼对行政权实施效率的影响

一个国家的行政权的实施效率,不仅依赖于行政执法的强制力,而且依赖于该国的宪法诉讼制度。良好的宪法诉讼制度会有助于行政权的实施;劣质的宪法诉讼制度会有害于行政权的实施。一个国家应当培养、扶持良好取向的宪法诉讼制度,使其成为主流的司法制度,从而节约行政权的实施成本,建设社会和谐。