跟踪干扰反应时间同变跳速电台驻留时间的关系

通过对变跳速电台干扰技术的分析,给出干扰站采用跟踪瞄准式干扰变跳速电台时,干扰反应时间同信号驻留时间的定量关系数学模型。

风光新能源接入台区级新型电力系统面临的问题及对策研究

本文在系统梳理和综述国内外相关文献资料的基础上,提出了风光新能源发电、新型电力系统、台区级新型电力系统的基本概念。其次,对台区新型电力系统典型应用新能源小区、景区民宿聚集区、工商业专变三种典型应用场景进行了分析。再次,详细阐述了台区新型电力系统在系统架构、关键技术、核心设备、典型业务、体制机制方面的问题,并提出对应的解决策略。最后,对研究内容进行了总结,并对需进一步研究的内容进行了展望。

Centering Marginalized Voices： The Study of Community Radio in India as an Agent of Social Change

Community Radio is a medium which the different threads mingle together brings different social threads together and weaves a vibrant fabric where all without compromising their original composition. Freedom of speech and expression is the cornerstone of this medium. In India, Community Radio started its journey in 2004, with the purpose of bringing different sections of the society together so that they can share their experiences, fears, and ambition. Social intervention has been one of the primary agenda Community Radio. Through various awareness-raising programs, it aims to bring positive social change in the lives of people residing around its transmission zone. It also aims to include different sub-sections of its community who are often excluded from the mainstream media.

The evolution of the intermediaries in e-commerce environment

With the development of network economy, e-commerce platform has increasingly become a worldwide trading places of various kinds of products and services. Therefore some scholars consider, intermediaries, under the rapid development of information technology, will gradually withdrew from the historical stage. This article carried on the thorough analysis for the reasons of the existence of electronic intermediaries, and discusses the new development space and prospect of new middlemen, from the perspective of information asymmetry of the network environment.

Analysis and Study on the Change of the Observed Geo-electric Field Data at Lhasa Geomagnetic Station before and after the Nepal MS8.1 Earthquake

In this paper,the main purpose is to analyze and research the characteristics of the geoelectric field observed data with a long time span and large amplitude abnormal change,at the Lhasa geomagnetic station( hereafter referred to as "Lhasa station "),before and after the Nepal M_S8. 1 strong earthquake,which occurred on April 25,2015. Based on the observation conditions,the observation system,and the observed data of Lhasa station preliminary discussed,the main characteristics of the abnormal change and evolution process are analyzed and studied,using the following two methods; the "synthesis energy accumulation"and the "power as MSA spectrum"analysis,from the two aspects of the"Time Domain"and"Frequency Domain. "The results show that the abnormal change of the geo-electric field observation of Lhasa station experienced a development stage following the process of "trend change- disturbance change- earthquake period-recovery period",and an evolution process of "low frequency change- high frequency change- smooth change- high frequency change ",before and after the Nepal M_S8. 1strong earthquake. Comprehensive analysis shows that the variation characteristics and evolution process of the geo-electric field at Lhasa station are basically consistent with the results of the relevant mechanism and phenomenon research. So far,this is valuable information with certain objectivity,which is typical and representative to reflect the whole process of the gestation, occurrence and complete development of such strongearthquakes.

配网避雷器保护失效的场路结合分析

针对10 kV变电台区设备在临近线路遭受雷击后虽然台区避雷器动作但仍发生台区变压器损坏的现象,本文使用场路结合分析的方法,对不同接地方式下的台区雷电冲击过电压进行分析。利用电磁暂态分析软件ATP-EMTP建立了台区雷电冲击电路分析模型,提取了经台区接地引下线进入接地体的冲击电流波形;使用接地分析软件CDEGS建立了台区接地体的场分析模型,得到了台区接地体在冲击电流作用下不同位置的电位瞬态分布情况。文章通过提取台区变压器高压绕组承受冲击电压的幅值,阐明了台区避雷器保护失效的机理,支撑了典型设计中对于台区接地方式的规定。