铝电解系列应急短路母线系统的设计与应用

近几年来,因现场人员误操作或管理不当引起的电解槽事故频发。铝电解系列应急短路母线系统的设计,可在电解槽事故中及时将事故槽短接掉,缩小事故影响范围,降低因事故对企业带来的经济损失,具有重大的经济效益和社会效益。根据事故类型及事故影响范围的差异要求,应急短路母线系统可以分为中间槽“跨槽”应急短路母线、中间槽“单槽”应急短路母线、端头槽“单槽”应急短路母线共计三种类型。     

短路电流计算在电力系统事故分析中的应用

通过对武钢电网发生的三起典型跳闸事故的简要介绍,论证短路电流的计算在电力系统事故原因分析中的重要作用,利用故障时短路电流的大小来推断故障点位置,从而缩短故障查找的时间。短路电流计算为电力系统事故原因分析和继电保护装置动作评价提供了有力的数据支撑。     

变压器副边短路事故分析

本文以一起变压器副边短路事故为例，对变压器副边短路过渡过程的过电流和过电压及其危害程度进行了分析，介绍了为避免此类事故发生所采取的措施。     

10 kV高炉变电站用变压器短路事故分析

针对一起因老鼠进入电站变压器室造成单相接地起弧发展成三相短路的事故,分析了造成这起事故的几个原因。通过计算短路点的短路电流,说明原电流互感器额定热稳定电流太小。采用新型号的电流互感器及加强了母排的绝缘保护后,消除了故障隐患,保证了用电安全。     

降低160 kA预焙电解槽短路事故率分析

预焙电解槽的可靠绝缘是电解槽安全、平稳高效运行的重要环节.本文对电解槽短路口短路事故进行分析,并提出应对措施.     

室内35KV母线弧光短路事故分析

对室内35KV母线弧光短路事故原因进行分析探讨,并提出了提高供电系统可行性的预防措施。     

一起10 kV电缆短路故障计算与分析

介绍了一起典型的10 kV电缆中间头短路故障现象,从故障录波信息中对故障的发生经过进行了详细的分析。计算了短路电流,分析了继电保护装置的动作可靠性,针对事故发生原因给出了建议和措施。     

一起10kv短路引起的越级跳闸事故分析

以一起10 kV短路事故为例,分析了造成越级跳闸事故的具体原因,提出了可行的整改措施,指出了微机保护装置正确选型的重要性。     

110kV主变压器近区短路故障分析及应对措施

通过对110kV主变压器近区短路故障进行四测分析法(绝缘电阻试验、绕组直流电阻试验、油气相色谱分析、绕组变形测试)分析,可大幅度精简试验项目,准确有效地分析事故情况,判断变压器运行状态,同时将分析时间由20h缩短至5h,提高变压器突发性近区短路事故处理效率和准确率。     

铝电解槽应急短路母线的设计与应用

铝电解槽母线系统断路事故的危险点主要集中于槽周母线熔断和立柱母线短路口爆炸两种情况。本文对阳极母线-阳极母线型、阳极母线-立柱母线型、出电侧母线-进电侧母线型、阳极母线-连接母线型、上部跨槽连接型和下部跨槽连接型等6种应急短路母线进行介绍,并结合9种可能出现的母线系统断路事故,介绍了其使用和联用情况。     

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.