降低铝电解槽焦粒焙烧冲击电压的试验研究

分析了预焙铝电解槽焦粒焙烧启动过程中造成冲击电压高的原因及不利影响,进行了降低焙烧通电冲击电压的试验研究。研究结果表明,改进焦粒的组成、用焦粒筛铺设焦粒以及通电初期电流合理分流,可降低焙烧冲击电压,提高电解槽焙烧质量。     

200 kA预焙铝电解槽煅后焦-石墨碎混合料焙烧方法

结合青海分公司生产实际,针对200 kA预焙槽在焦粒焙烧过程中的存在的问题,提出煅后焦-石墨碎混合料焙烧工艺,确定焦粒和石墨碎之比(重量比)为73,焙烧效果良好,冲击电压低于5.5V,焙烧过程中电流分布更趋均匀,横向温度梯度小于200℃,减少电解槽阴极的早期破损的可能,有利于延长电解槽寿命.     

降低240kA铝电解槽焙烧启动成本的途径探讨

从240 kA铝电解槽焦粒焙烧启动过程中物料与能源消耗入手,结合生产实际对焙烧启动过程中装炉用料配比的优化、最佳焙烧时间的确认、湿法无效应启动以及降低启动电压等方面进行了研究,探讨了降低240 kA铝电解槽焙烧启动成本的途径,并对产生的经济效益与社会效益进行了阐述。     

预焙电解槽用焦粒焙烧启动中的实践探讨

电解槽焙烧启动是电解铝生产的重要阶段.焦粒焙烧法具有操作相对简便、技术可靠、焙烧时间短,一次可焙烧多处电解槽等优点,现已在大型预焙槽电解铝厂得到普遍应用,以求减少对电解槽内衬材料的热冲击,对筑炉时存在的裂缝等缺陷,希望在启动后由电解质优先进入从而阻挡铝液的持续渗入;减轻了劳动量,维护了安全有序的启动生产现场.其通过焦粒焙烧在启动中的应用,提出了一些优化措施.     

大型预焙槽焦粒焙烧探讨

国内目前采用的焙烧方法主要有两种:铝液焙烧及焦粒焙烧.焦粒焙烧法具有操作相对简便、技术可靠、焙烧时间短,一次可焙烧多处电解槽等优点,现已在大型预焙槽电解铝厂得到普遍应用,以求减少对电解槽内衬材料的热冲击及筑炉时存在的裂缝等缺陷,希望在启动后由电解质优先进入从而阻挡铝液的持续渗入.     

铝电解槽焙烧启动技术对比

本文介绍了燃气焙烧启动技术的过程控制,从焙烧效果及经济性等方面对比焦粒焙烧技术和燃气焙烧技术.对比结果显示,焦粒焙烧电解槽的总体上抬量小于燃气焙烧电解槽的上抬量;焦粒焙烧电解槽前期升温速度偏快,可控程度相对稍差,燃气焙烧升温速度稍慢,升温均恒,便于控制;两种焙烧方法的电解槽的阴极钢棒温度、炉底板温度和熔体区槽壳温度没有...     

大型预焙槽焦粒焙烧探讨

国内目前采用的焙烧方法主要有两种:铝液焙烧及焦粒焙烧.焦粒焙烧法具有操作相对简便、技术可靠、焙烧时间短,一次可焙烧多处电解槽等优点,现已在大型预焙槽电解铝厂得到普遍应用,以求减少对电解槽内衬材料的热冲击及筑炉时存在的裂缝等缺陷,希望在启动后由电解质优先进入从而阻挡铝液的持续渗入.     

400kA异型阴极结构预焙铝电解槽焦粒焙烧启动技术与管理

介绍了400kA异型阴极结构预焙电解槽的焦粒焙烧启动技术及管理,提出了异型阴极结构预焙电解槽焦粒焙烧启动及管理的一些实践经验和技术方法,实践证明焦粒焙烧启动方法在异型阴极结构预焙电解槽上是可以推广应用的,而且效果良好。     

异型阴极铝电解槽电解质-焦粒焙烧启动技术实践及分析

分析了铝电解槽常用的焙烧启动方法的优缺点,详细介绍了重庆天泰铝业300 kA异型阴极铝电解槽电解质-焦粒焙烧启动方法并与常用方法进行了对比分析,实践证明异型阴极铝电解槽采用电解质-焦粒焙烧启动效果更好。     

400kA系列槽通电冲击电压过高原因分析

本文详细分析了黄河鑫业400 kA系列铝电解槽通电焙烧时冲击电压过高的原因,并采取了相应的整改措施,取得了十分显著的效果。     

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.