新型电子脱扣器测试装置

新型电子脱扣器采用升流器提供低压力大电流，利用单片机检测电子脱扣器动作信号及动作时间。该测试装置具有精度高、性能稳定、集成度高等特点。     

低压智能断路器保护参数整定思路及原则

在介绍低压智能断路器的主要保护功能的基础上,从工厂供配电运行的实际出发,提出了低压智能断路器保护参数整定的思路及原则。以此思路和原则对低压智能断路器保护参数进行整定,使其及时、有效、准确地对供配电系统起到保护作用,确保工厂供配电系统稳定运行。     

低压网络短路电流的计算和保护装置的选择

较为详细地阐述了电力系统中低压网络短路电流的计算方法，并通过实例，依据计算出的结果介绍了配电线路用低压断路器保护的选型和整定，希望对从事电气工作的同行有一定的参考价值。     

探讨低压断路器在配电系统中的使用

本文对低压断路器选型原则与整定原则、断路器的级问配合问题及其安装方式等问题阐述了其基本原则,并且了解了其技术性能、使用环境条件.     

SW6—110型少油断路器绝缘油受潮原因分析及处理

1　引言昆钢现日耗电量在 2 90万 k W· h左右 ,如何保证生产顺利 ,动力介质的正常供应是关键 ,电力保障是重中之重。昆钢 2 2 0 k V总降采用了 SW6- 1 1 0型少油断路器 ,此断路器配用 CY3 型液压操作机构 ,可以进行电动快速分闸、合闸及重合闸操作。确保各断路器的安全可靠运行成为我们日常的重点工作课题。2　断路器的绝缘试验断路器的绝缘试验包括有 :测量绝缘电阻、测量介质损失角正切值 tgδ、测量泄漏电流、交流耐压试验和绝缘油试验。其中测量泄漏电流是 3 5 k V及以上少油断路器的重要实验项目 ,一般在大修时或 1～ 3年进行 1次…     

低压断路器的种类与选择

介绍了热断路器、磁断路器和漏电断路器等几种目前常见的断路器,并介绍了如何根据周围环境特征、电流种类、电压大小、保护要求等条件进行选择。     

正确理解和选择低压断路器的电流参数

分析低压断路器的各个电流参数的概念、俗称及其作用,帮助从事电气设计、采购、施工和监理工作人员正确理解断路器参数的意义和确定参数,并提出选择低压断路器时就标定的电流参数和标定方法。     

YBCO带材直流冲击特性的LM神经网络预测

柔性直流电网中的直流(DC)侧短路故障电流会严重危害电网的运行,而电阻型超导故障限流器(RSFCL)能有效地限制短路故障电流的增长,降低对直流断路器开断容量和开断时间的要求.为了研究用于RSFCL的氧化钇钡铜(YBCO)超导带材在短时直流冲击电流下的电阻特性,根据故障电流特征搭建了高压直流冲击平台,实验测量了在不同电流...     

大接地电流系统零序电流保护

通过对大接地电流系统零序电流的分析、计算,阐述了用于接地短路的零序电流保护的构成及整定原则,并介绍了在包头第一热电厂及包钢51＃总降压变电所110KV网络的应用。     

论采用快速断路器可大幅度减少电缆截面

介绍了一种基于电磁斥力原理的快速断路器;通过实例比较了改变短路电流持续时间对电缆选择的重要影响;分析了快速断路器的使用可大幅度减少电缆截面,节约工程造价;提出了电缆截面梯形图的应用;探讨快速断路器在多级开闭所的使用方法。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.