Overvoltage suppression for UHV transmission lines

The overvoltage phenomena of ultra high voltage (UHV) transmission lines are analyzed and verified by EMTDC/PSCAD simulation. Referring to the theoretical analyses and operating experiences of extra high voltage (EHV) transmission lines in China and UHV transmission lines in Russia and Japan, the methods to suppress the internal overvoltage in UHV transmission lines by protection and control strategies are discussed. Through the cooperation among the recloser, shunt reactor, tripping and closing resistance, and metal oxide varistor (MOV), the overvoltage can be restrained within an acceptable level.     

巴西彩龟对嗜水气单胞菌的免疫应答研究

选择对巴西彩龟毒力最强的嗜水气单胞菌菌株，扩大培养制成灭活福尔马林菌苗，分别对巴西彩龟进行注射和浸泡试验．经过对吞噬细胞吞噬活性、血清抗体效价的检测和攻毒试验，结果表明，受免组各项指标均明显高于对照组，免疫保护力达到81％以上．其中浸泡组各项指标略低于注射组．     

An immunity-based technique to detect network intrusions

INTRODUCTION Research interest in immune system has in-creased over the past few years, and because of its special information processing capabilities, it has been applied to solve many problems (de Castro and Von Zuben, 1999; Hunt and Cooke, 1996). Among these research areas, network security is one of the hot spots and has been considered as analogous to im-munity in natural systems. Researchers at the Uni-versity of New Mexico did a lot of research in this area (Forrest et al., 199…     

关汉卿社会现实剧的深层结构

在关汉卿社会现实剧的深层结构中，社会现实对平民的生存压制为其基部结构，平民依靠自身力量或外界的介入戏剧性地排解压制为其顶部结构。基部结构引发了下层民众的排解动作，顶部结构是对基部结构的回应和重构。这种深层结构是关汉卿社会现实剧介入现实、寄寓憧憬的生发地，也是关汉卿剧的“神髓”所在。     

垃圾破碎挤压制作水泥砖系统研究

本文研究设计了一种垃圾处理系统,可以将城市生活垃圾经过破碎、高温消毒、挤压成型,做成水泥砖,用于铺设非重要部位的人行道、地面、庭院、院墙等。     

免疫系统细胞凋亡研究进展

综述了近年来免疫系统细胞凋亡的研究进展,特别介绍了作者对于Fa s/FasL在免疫系统细胞凋亡特别是AICD中的作用和调节及共刺激与免疫细胞凋亡等方面的研究成果。