电力电子的绿色变换技术与绿色电源的发展

电力电子技术应用日益广泛,同时也带来严重的谐波污染和电磁干扰。本文介绍了电力电子在电磁兼容和谐波抑制方面的绿色变换技术。同时还就绿色电源产业的形成和绿色电源产品要求作了简要说明。     

现代战争中的电子干扰和反干扰技术

介绍现代战争中的电子干扰和反干扰技术、提高干扰与抗干扰能力的相关新技术措施,以及国内外现有的新电子干扰设备,描述电子对抗的发展趋势,同时也指出了仍存在的一些问题.     

黄河口河道演变规律探讨

通过分析黄河口河道在纵剖面、横断面、河型等方面的演变过程,总结归纳出黄河口河道的演变规律。指出:黄河口泥沙在潮汐涨落等因素影响下,河口河道纵剖面逐渐形成台阶状,与此同时,河口滩地横比降逐渐发展为倒比降;河口河道中段由顺直型河道逐渐转为弯曲型河道,而下段仍为相对顺直、游荡型河道。当河口河道中段比降减小到一定程度后,此河段开始漫滩、卡冰、出汊。河口台阶的形成揭示了黄河口流路由单股河道逐渐转为出汊的过程,即黄河口流路由“青壮期”逐渐转为“衰亡期”的过程。延长黄河口流路使用年限的途径是:①尽量减少黄河下游输向黄河口的泥沙量;②采取河口挖沙或人工改汊措施,地点宜选在河口河道的中下段。     

单脉冲导引头对多干扰源的角分辨

当多个噪声调频干扰同时进入单脉信号引头主波束内时，导引头对干扰源的角度分辨是非常困难的。本文主要研究了导引头单脉冲接收机对宽带噪声调频干扰源的响应，分析了当单脉冲主波束内存在多个噪声调频干扰源时，导引头指向角的跟踪规律，并重点讨论了一种用聚类来提取角信息的方法，最后仿真证实了该方法的正确性和有效性。     

Using ion implantation to adjust the transition temperature of superconducting films

We summarize a continuing investigation into using ion implantation to alter the transition temperature of superconducting thin films. The primary motivation for the work presented here was to study the feasibility of using magnetic ion doping to replace the bi-layer T_c control process currently used for certain cryogenic detector applications at National Institute for Standards and Technology. The results from work with various ion species implanted into aluminum, molybdenum, titanium and tungsten host films are presented.     

The social consequences of expressive suppression.

At times, people keep their emotions from showing during social interactions. The authors' analysis suggests that such expressive suppression should disrupt communication and increase stress levels. To test this hypothesis, the authors conducted 2 studies in which unacquainted pairs of women discussed an upsetting topic. In Study 1, one member of each pair was randomly assigned to (a) suppress her emotional behavior, (b) respond naturally, or (c) cognitively reappraise in a way that reduced emotional responding. Suppression alone disrupted communication and magnified blood pressure responses in the suppressors' partners. In Study 2, suppression had a negative impact on the regulators' emotional experience and increased blood pressure in both regulators and their partners. Suppression also reduced rapport and inhibited relationship formation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

通信局房供电系统的谐波治理

本文在理论分析谐波产生及危害的基础上,针对某一通信局房,确定最终谐波治理方案并取得较好的治理效果,供同行在设计时参考。     

相控阵AEW雷达杂波抑制的辅助通道方法研究

本文分析了相控阵机载预警(AEW)雷达杂波抑制的现有两种辅助通道降维技术(Klemm方法和简化方法)的性能，并提出了一种新的辅助通道方法。新方法的基本思想为：根据待处理距离段内各距离单元杂波能量在波束一多普勒域分布的统计特征自适应地选取辅助通道，使所选辅助通道实时地逼近杂波子空间，从而有效抑制杂波。本文方法不但可以用于非正侧视阵情况，而且误差鲁棒性好。计算机仿真结果证实了其有效性。     

Moderators of nonverbal indicators of deception: A meta-analytic synthesis.

In many legal proceedings, fact finders scrutinize the demeanor of a defendant or witness, particularly his or her nonverbal behavior, for indicators of deception. This meta-analysis investigated directly observable nonverbal correlates of deception as a function of different moderator variables. Although lay people and professionals alike assume that many nonverbal behaviors are displayed more frequently while lying, of 11 different behaviors observable in the head and body area, only 3 were reliably associated with deception. Nodding, foot and leg movements, and hand movements were negatively related to deception in the overall analyses weighted by sample size. Most people assume that nonverbal behaviors increase while lying; however, these behaviors decreased, whereas others showed no change. There was no evidence that people avoid eye contact while lying, although around the world, gaze aversion is deemed the most important signal of deception. Most effect sizes were found to be heterogeneous. Analyses of moderator variables revealed that many of the observed relationships varied as a function of content, motivation, preparation, sanctioning of the lie, experimental design, and operationalization. Existing theories cannot readily account for the heterogeneity in findings. Thus, practitioners are cautioned against using these indicators in assessing the truthfulness of oral reports. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

无线电引信被干扰率及抗干扰率

本文从无线电引信相对杀伤比率出发，引伸出引信被干扰率及抗干扰率的定义及计算公式。