浅谈TCSC对电力系统次同步谐振的抑制

在从物理本质方面分析了TCSC的阻抗特性后,以IEEE SSR第一标准系统为例,通过时域仿真分析法再次引用和验证了TCSC装置对系统次同步谐振的抑制效果。     

JGX-1543G型交流固体继电器的设计

本文介绍了一种交流固体继电器JGX - 1543G型的研制过程,描述了继电器的性能要求和工作原理,并着重分析了该产品在电路、结构和工艺等三个方面的设计方法.     

天广可控硅控制串补暂态稳定及次同步谐振初步研究

可控硅控制串补(TCSC)对提高系统暂态稳定性的作用已逐渐为大家所了解,本文将结合计划于2003年投产的我国第一个TCSC工程-天广TCSC工程,对其提高南方电网稳定水平的作用进行分析。本文还对一种在工程中应用的次同步谐振分析方法进行了介绍。     

基于路由器的负载平衡技术在校园网中的应用

对负载平衡的概念和常用方法进行分析 ,并利用凯创 (Cabletron)路由器 SSR (Smart Switch Router)在校园网中实现了各种应用服务器的负载平衡     

高压大电流固体继电器测试系统设计

介绍了以计算机为核心的高压大电流固体继电器电参数综合测试系统，详细描述了系统的硬件组成、软件设计和抗干扰能力。     

一种改善单脉冲二次雷达跟踪器的预测误差的β值方法的分析

介绍了目前应用于单脉冲二次雷达的跟踪器．主要对其预测精度和多径效应对跟踪效果的影响进行了分析．并在此基础上给出一种减少预测误差的方法。     

青藏高原露天矿山高陡边坡稳定性监控实践

边坡稳定性监测雷达SSR系统是世界先进的亚毫米级精度的持续实时监测技术,也是高精度、长距离边坡稳定性监测设备。该文以西藏华泰龙矿业开发有限公司甲玛露天矿区边坡稳定性监控实践为例,通过引进国外雷达SSR系统,并以该系统为主创建了露天矿山高陡边坡稳定性监测系统,达到了实时监控和预测边坡失稳的目的。对同类露天矿山安全生产管理水平的提高,具有重要的推广价值和广阔的应用前景。     

Investigation of the sludge reduction mechanism in the anaerobic side-stream reactor process using several control biological wastewater treatment processes

To investigate the mechanism of sludge reduction in the anaerobic side-stream reactor (SSR) process, activated sludge with five different sludge reduction schemes were studied side-by-side in the laboratory. These are activated sludge with: 1) aerobic SSR, 2) anaerobic SSR, 3) aerobic digester, 4) anaerobic digester, and 5) no sludge wastage. The system with anaerobic SSR (system #2) was the focus of this study and four other systems served as control processes with different functions and purposes. Both mathematical and experimental approaches were made to determine solids retention time (SRT) and sludge yield for the anaerobic SSR process. The results showed that the anaerobic SSR process produced the lowest solids generation, indicating that sludge organic fractions degraded in this system are larger than other systems that possess only aerobic or anaerobic mode. Among three systems that involved long SRT (system #1, #2, and #5), it was only system #2 that showed stable sludge settling and effluent quality, indicating that efficient sludge reduction in this process occurred along with continuous generation of normal sludge flocs. This observation was further supported by batch anaerobic and aerobic digestion data. Batch digestion on sludges collected after 109 days of operation clearly demonstrated that both anaerobically and aerobically digestible materials were removed in activated sludge with anaerobic SSR. In contrast, sludge reduction in the aerobic SSR process or no wastage system was achieved by removal of mainly aerobically digestible materials. All these results led us to conclude that repeating sludge under both feast/fasting and anaerobic/aerobic conditions (i.e., activated sludge with anaerobic SSR) is necessary to achieve the highest biological solids reduction with normal wastewater treatment performance.     

Characterization of Novel Di-, Tri-, and Tetranucleotide Microsatellite Primers Suitable for Genotyping Various Plant Pathogenic Fungi with Special Emphasis on Fusaria and Mycospherella graminicola

The goals of this investigation were to identify and evaluate the use of polymorphic microsatellite marker (PMM) analysis for molecular typing of seventeen plant pathogenic fungi. Primers for di-, tri-, and tetranucleotide loci were designed directly from the recently published genomic sequence of Mycospherlla graminicola and Fusarium graminearum. A total of 20 new microsatellite primers as easy-to-score markers were developed. Microsatellite primer PCR (MP-PCR) yielded highly reproducible and complex genomic fingerprints, with several bands ranging in size from 200 to 3000 bp. Of the 20 primers tested, only (TAGG)4, (TCC)5 and (CA)7T produced a high number of polymorphic bands from either F. graminearum or F. culmorum. (ATG)5 led to successful amplifications in M. graminicola isolates collected from Germany. Percentage of polymorphic bands among Fusarium species ranged from 9 to 100%. Cluster analysis of banding patterns of the isolates corresponded well to the established species delineations based on morphology and other methods of phylogenetic analysis. The current research demonstrates that the newly designed microsatellite primers are reliable, sensitive and technically simple tools for assaying genetic variability in plant pathogenic fungi.     

Development of Microsatellite Markers Using Pyrosequencing in Galium trifidum (Rubiaceae), a Rare Species in Central Europe

We identify a large number of microsatellites from Galium trfidum, a plant species considered rare and endangered in Central and Western Europe. Using a combination of a total enriched genomic library and small-scale 454 pyrosequencing, we determined 9755 contigs with a length of 100 to 6192 bp. Within this dataset, we identified 153 SSR motifs in 144 contigs. Here, we tested 14 microsatellite loci in 2 populations of G. trifidum. The number of alleles and expected heterozygosity were 1-8 (mean 3.2) and 0.00-0.876 (0.549 on average), respectively. The markers described in this study will be useful for evaluating genetic diversity within and between populations, and gene flow between G. trifidum populations. These markers could also be applied to investigate the biological aspects of G. trifidum, such as the population dynamics and clonal structure, and to develop effective conservation programs for the Central European populations of this species.