提高电工圆铝杆质量的途径

电工圆铝杆是生产铝导线的主要原材料,电工圆铝杆的质量直接影响铝导线的质量,提高电工圆铝杆的质量对节约能源,降低费用有着重要的意义。     

稀土及硼化处理对电工圆铝杆电阻率的影响

电工圆铝杆生产存在一些质量不稳定因素,其中电阻率超标危害最大.从生产实际出发,可确定造成电阻率较高的主要影响因素是原铝中的微量元素钒、钛、锰、铬较高.除可降低电阻率外,稀土对电工圆铝杆的质量影响不大.针对这种现状,通过理论分析和相关调查,决定采用铝液硼化处理的新工艺有效除杂,降低铝杆电阻率.实践证明,铝液经硼化处理生产出的铝杆,电阻率明显降低,优化了铝杆的导电性能,为铝杆的质量提高打下了坚实的基础.     

电工圆铝杆净化方法的现状与展望

详细介绍了目前铝熔体的净化方法及其对电工圆铝杆性能的影响,并对净化工艺进行了展望。认为目前较好的净化工艺是气体、熔剂联合吹炼(精炼)+泡沫陶瓷过滤板过滤。     

高效排杂熔剂净化对提高高强电工铝杆性能的作用

用自行研制的高效排杂熔剂进行净化处理，探讨了其对提高高强电工铝杆塑性和导电性等的作用。结果表明：经高效排杂熔剂净化处理后，铝杆中的夹杂物和气孔含量显著降低，除杂率和气孔降低率分别达73．5％和92．1％；配合晶粒细化处理后，与常规处理比，明显提高了铝杆的性能，尤其是强度提高的同时，伸长率仍得到显著提高（幅度达62．7％），电阻率降低幅度达0．93％。     

稀土在电工用铜母线中的应用实践

本文介绍了电工用稀土铜母线的主要生产工艺，分析了稀土在电工用铜母线生产中的作用。生产实践表明．稀土具有良好的净化熔体、细化晶粒及杂质相变质作用。当Ce加入量为0．06％时，铜母线成品的硬度（HB）及导电率分别比国家标准值提高23％、1．5％，可满足大多数场合的使用要求。     

高导电率Al-RE-B电工圆铝杆工艺研究

对高导电率Al-RE-B电工圆铝杆生产工艺进行了系统研究,分析了RE、B合金元素、连铸连轧工艺对电工圆铝杆组织和性能的影响。     

直接用电解铝液生产电工圆铝杆的精炼质量控制

直接用电解铝液生产电工圆铝杆可通过炉内精炼、在线除气、过滤、减少二次污染等提高和保证铝液洁净度;通过电磁搅拌提高铝液化学成分和温度均匀性;通过添加20％～40％固体料改善内部组织生产出高质量的产品。同时与用重熔铝锭生产相比可降低成本400元／t以上。     

F46复合薄膜烧结铝扁线及其加工工艺

本发明介绍了F46复合薄膜烧结铝扁线及其加工工艺。首先，对电工圆铝杆表面油污进行清洗然后干燥；再将电工圆铝杆通过挤压机进行挤压，形成铝扁线；将氟化乙丙烯通过上浆机附着在聚酰亚胺薄膜上，经烘烤后形成聚酰亚胺一F46复合薄膜；最后，将聚酰亚胺-F46复合薄膜绕包到铝扁线上，经过高频烧结，制成F46复合薄膜烧结铝扁线。本发明制作工艺简单、合理，可以将传统的外部辐射加热转化为内部导电加热；提高产品耐水性，经100℃水煮240h，取出后吹干，耐压值不低于原来的90％。     

电工用铝硼化处理的工艺实践

原铝中的杂质元素Cr、Mn、V和Ti是影响电工圆铝杆电阻率的主要因素。在生产实践中,我们可以通过对电工用铝进行硼化处理来去除Cr、Mn、V和Ti,达到降低电工圆铝杆电阻率的目的。本文介绍在生产当中最常用的两种硼化处理方法:氟硼酸钾硼化处理法和铝硼中间合金硼化处理法,并对这两种方法进行了对比,指出应依据技术可行、经济合理的原则,选择合适的硼化方法和工艺参数。     

电工圆铝杆常见缺陷及其预防措施

简要介绍在电工圆铝杆生产中，铝液的化学成份控制，连铸连轧生产过程中常见的缺陷及预防措施。     

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.