浅谈电力系统消弧线圈

从结构接线、工作原理、补偿方式及容量的选择等方面对消弧线圈进行了介绍,闸述了它在系统中应用的优点以及必要性,最后介绍了消弧圈中新技术应用.     

两种进化算法在BSS中的应用比较

介绍了两种分别引人遗传算法和免疫算法的盲源分离方法．通过仿真比较试验表明,两种算法对混叠信号的分离都有效,但基于免疫算法的分离效果都优于基于遗传算法的分离结果．     

基于时域卷积盲信号分离的雷达干扰抑制算法

把卷积盲分离算法应用于雷达系统抗干扰中,提出一种新的雷达系统干扰抑制算法. 该算法在时域中对四阶累积量进行联合块对角化,以实现雷达信号和干扰信号的盲分离. 计算机仿真结果表明,在无噪及含噪情况下,该算法均可把卷积混合的雷达回波信号及干扰信号分离开来,且有很好的分离性能.     

急性亚极量运动24h后机体血清免疫抑制蛋白的变化

探讨急性亚极量运动诱发机体免疫抑制蛋白(Immune Suppressive Protein of Stress,ISPS)出现的最短时间。方法:以北京体育大学研究生院8名健康学生为研究对象,实施急性亚极量强度跑台运动,受试者分别于运动前、运动后24 h无菌采集静脉血进行指标测定。结果发现,急性亚极量运动后24 h机体内ISPS水平升高,证实在急性运动后短至24 hISPS就能在人体内被诱导出现。结论:与运动前相比,急性亚极量运动应激24 h后,受试者血清对正常小鼠ConA诱导的淋巴细胞增殖具有明显的抑制作用,是血清中ISPS蛋白水平升高引起。     

Abnormalities of masseter inhibitory reflex in patients with episodic tension-type headache

Objective: To investigate the masseter inhibitory reflex (MIR) and its eventual changes in patients with episodic tension-type headache (TTH). Methods: MIR was studied in 21 patients with episodic TTH and 30 healthy subjects, with age and sex matched to the study cohort. Median age of patients was 17,0 years (ranged 16～49 years), median duration of disease 12 months (1～5 years), and median frequency of headache 7.5 d per month. Results: The second period of suppression (S2) of MIR was reduced in intensity and duration in 10% of controls and 66.7% (confidence interval (CI)=45.3%～85%; P<0.05) of patients with episodic TTH (χ2=74.9; P<0.001). In 3 (14.3%) of patients with episodic TTH, S2 was completely absent. No significant correlation between the duration of disease and headache frequency was found. Conclusion: Our results confirm the link between episodic TTH and reduction or absence of S2. Teenage patients with episodic TTH may exhibit marked pathological changes in S2 in contrast to older individuals.     

基于小生境免疫算法的多约束QoS路由选择

针对多约束QoS路由选择问题,将其转化为一个多约束赋权图最短路径问题,选择费用、带宽、时延和丢失率为QoS参数.针对一种免疫算法的不足,利用基于相似结构的小生境技术和共享算子对免疫算法加以改进.实验表明,该算法有较好的性能,大幅提高了QoS路由选择的效率.     

Cognitive Difficulties in Struggling Comprehenders and Their Relation to Reading Comprehension: A Comparison of Group Selection and Regression-Based Models

ABSTRACT

Difficulties suppressing previously encountered but currently irrelevant information from working memory characterize less skilled comprehenders in studies in which they are matched to skilled comprehenders on word decoding and nonverbal IQ. These “extreme” group designs are associated with several methodological issues. When sample size permits, regression approaches permit a more accurate estimation of effects. Using data for students in Grades 6 through 12 (n = 766), regression techniques assessed the significance and size of the relation of suppression to reading comprehension across the distribution of comprehension skill. After accounting for decoding efficiency and nonverbal IQ, suppression, measured by performance on a verbal proactive interference task, accounted for a small amount of significant unique variance in comprehension (less than 1%). A comparison of suppression in less skilled comprehenders matched to more skilled comprehenders (48 per group) on age, word reading efficiency, and nonverbal IQ did not show significant group differences in suppression. The implications of the findings for theories of reading comprehension and for informing comprehension assessment and intervention are discussed.     

红楼三题

康乾盛世是封建"末世"的回光反照,资本主义因素正在增多增强。但没有形成什么"市民阶层"。贾宝玉不是"将要转换着的社会中即将出现的新人的萌芽",而是个抑封建之尊、不满封建制度的人物。读《红楼梦》,可提高文化修养,更可形象化地了解封建社会。     

兽用免疫佐剂的研究进展

佐剂可以增强机体对抗原的免疫应答反应,可以显著增强疫苗的免疫效果.综述了在兽用疫苗研究领域中常用的免疫佐剂,并对佐剂的发展趋势作了展望.     

鸡新城疫抗体监测和免疫程序的研究

在同一群鸡不同日龄阶段按20/1000羽随机采血分离血清,分别检测新城疫 H I抗体,观察其抗体水平消长规律。结果表明,在参考的免疫程序中13日龄和23日龄的H I抗体水平明显低于阳性标准血清的7（log2）抗体值。鸡新城疫的免疫程序建议为：首免5-7日龄Ⅱ系饮水或滴鼻;二免14-16日龄Ⅱ系或Ⅳ系饮水或滴鼻;三免30-32日龄Ⅳ系饮水或滴眼;四免60-70日龄Ⅰ系肌肉注射;五免110-120日龄Ⅰ系肌肉注射;后每隔五个月加免一次Ⅰ系肌肉注射。