老化、温度变化和局部阴影等引起的电池电气特性不同,使光伏阵列P-U曲线出现多个功率峰值点。大容量光伏阵列组件数多,其多峰值问题比小容量光伏阵列更常见和复杂。该文首先根据局部阴影条件下光伏阵列分段函数型输出特性,建立其S函数...老化、温度变化和局部阴影等引起的电池电气特性不同,使光伏阵列P-U曲线出现多个功率峰值点。大容量光伏阵列组件数多,其多峰值问题比小容量光伏阵列更常见和复杂。该文首先根据局部阴影条件下光伏阵列分段函数型输出特性,建立其S函数模型。然后提出免疫细菌觅食算法,实现大容量光伏阵列全局最大功率点跟踪(global maximum power point tracking,GMPPT),利用细菌觅食算法的随机选取方向特性和免疫选择算子,实现时变环境下全局最大功率点的动态跟踪,将所有跟踪到的全局最大功率点保存到全局最大功率点记忆池,再利用全局最大功率点记忆池初始化群体和产生迁移个体新位置,加快重复出现全局最大功率点的跟踪速度。仿真结果表明,免疫细菌觅食算法在动态和重复出现局部阴影条件下都有良好的GMPPT跟踪定位能力。展开更多
对福建气枪源探测实验中所接入315个实时传输台站分1~10 Hz、0.1~1 Hz、10~60 s 3个频段进行台网噪声水平评估研究。统计240个小时的背景噪声记录,得到各台站的噪声水平MODE线,再利用本文提出的全球新高低噪声模型线与MODE线所占面积比...对福建气枪源探测实验中所接入315个实时传输台站分1~10 Hz、0.1~1 Hz、10~60 s 3个频段进行台网噪声水平评估研究。统计240个小时的背景噪声记录,得到各台站的噪声水平MODE线,再利用本文提出的全球新高低噪声模型线与MODE线所占面积比来量化台网噪声水平,根据不同色标将台网噪声水平划分为十个等级进行评估,评选出优质台站。进一步研究背景噪声对气枪激发效果的影响,验证了台站接收能力与背景噪声密切相关,分析了不同台基(固定、加密、流动、海底)环境噪声水平的影响,得出环境噪声水平由低到高分别为固定台、加密台、流动台、海底台。通过台网噪声评估能有效提高气枪震源信号的检测能力,也为优质台站重点维护提供重要参考。展开更多
The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which...The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which has picked up some of the government’s administrative functions. Although this new, institutionalized management model has theoretically made democratic managerial participation at the grassroots level possible, it has brought about endless problems, overt and covert, shortly after its appearance, some of which are even alarming. A comprehensive analysis of the data collected over a long period of time has led to the conclusion that this system is a failure, attributable to the overt factor related to skills in reality and the covert “priori” factor that is masked by the former. The existence of such “priori” factor once again demonstrates the deep-rooted, traditional managerial logic: Positive operations is society need only to depend upon individuals’ unstable self-disciplined morality rather than to build a system. The current paper points out that any change in the socioeconomic structure that has long been subject to the power of politics is to inevitably incur a corresponding global structural accommodation, including politics itself. To respond to the two factors for the failure, system building in the two overlapping areas is a must.展开更多
文摘老化、温度变化和局部阴影等引起的电池电气特性不同,使光伏阵列P-U曲线出现多个功率峰值点。大容量光伏阵列组件数多,其多峰值问题比小容量光伏阵列更常见和复杂。该文首先根据局部阴影条件下光伏阵列分段函数型输出特性,建立其S函数模型。然后提出免疫细菌觅食算法,实现大容量光伏阵列全局最大功率点跟踪(global maximum power point tracking,GMPPT),利用细菌觅食算法的随机选取方向特性和免疫选择算子,实现时变环境下全局最大功率点的动态跟踪,将所有跟踪到的全局最大功率点保存到全局最大功率点记忆池,再利用全局最大功率点记忆池初始化群体和产生迁移个体新位置,加快重复出现全局最大功率点的跟踪速度。仿真结果表明,免疫细菌觅食算法在动态和重复出现局部阴影条件下都有良好的GMPPT跟踪定位能力。
文摘对福建气枪源探测实验中所接入315个实时传输台站分1~10 Hz、0.1~1 Hz、10~60 s 3个频段进行台网噪声水平评估研究。统计240个小时的背景噪声记录,得到各台站的噪声水平MODE线,再利用本文提出的全球新高低噪声模型线与MODE线所占面积比来量化台网噪声水平,根据不同色标将台网噪声水平划分为十个等级进行评估,评选出优质台站。进一步研究背景噪声对气枪激发效果的影响,验证了台站接收能力与背景噪声密切相关,分析了不同台基(固定、加密、流动、海底)环境噪声水平的影响,得出环境噪声水平由低到高分别为固定台、加密台、流动台、海底台。通过台网噪声评估能有效提高气枪震源信号的检测能力,也为优质台站重点维护提供重要参考。
文摘The reform of the housing system in Shanghai has unexpectedly given rise to a self-governed property owners’ collective supervisory system, primarily in the form of Property Owners’ Supervisory Council (POSC), which has picked up some of the government’s administrative functions. Although this new, institutionalized management model has theoretically made democratic managerial participation at the grassroots level possible, it has brought about endless problems, overt and covert, shortly after its appearance, some of which are even alarming. A comprehensive analysis of the data collected over a long period of time has led to the conclusion that this system is a failure, attributable to the overt factor related to skills in reality and the covert “priori” factor that is masked by the former. The existence of such “priori” factor once again demonstrates the deep-rooted, traditional managerial logic: Positive operations is society need only to depend upon individuals’ unstable self-disciplined morality rather than to build a system. The current paper points out that any change in the socioeconomic structure that has long been subject to the power of politics is to inevitably incur a corresponding global structural accommodation, including politics itself. To respond to the two factors for the failure, system building in the two overlapping areas is a must.
