2800mm中板轧机油膜轴承故障诊断及维护浅谈

主要介绍了2800mm中板轧机油膜轴承在使用过程中常见的几种失效形式,并从油膜轴承的存放、安装、维护和使用方面探讨了失效的原因及预防措施。     

筒式球磨机减速机齿轮的失效分析与润滑改进

从筒式球磨机减速机齿轮的主要失效形式,结合使用工况特点,分析了润滑对齿轮失效形式的影响。并根据使用、维修中的实际情况,探讨改进减速机润滑的措施。     

金属材料失效浅析

从金属材料失效的定义出发,研究了断裂、磨损、腐蚀三种主要的金属材料失效形式,分析其形成原因及特点,探讨如何预防常见的金属材料失效。     

带钢冷轧工作辊辊身剥落事故的预防

辊身剥落是带钢冷轧工作辊的主要失效形式，本文通过对其常见的剥落失效形式进行简要分析，提出了在使用、维护、管理等方面所应采取的预防措施。     

电动闸阀故障原因分析及对策

主要根据使用中闸阀阀板上铜螺母短时间内迅速失效的情况,结合阀门的工作状况、结构形式,分析了铜螺母失效的原因,并根据现场实际的工况,从阀门密封面的结构和铜螺母的结构形式上提出了改进的方法,从而延长铜螺母的使用寿命。     

非铸造钢砂的研制与锯切特性

在试验基础上分析了钢砂的显微组织和硬度特点，讨论了铸砂的服役过程、运动规律，失效形式。指出，在锯切花岗石过程中钢砂承受多次冲击接触载荷，破碎是失效的主要形式。现产的国内外铸造钢砂内部存在微裂纹，它是早期失效的主要原因。为改善钢沙质量试制了非铸造新钢砂，锯切试验结果表明．质量接近进口钢砂。     

干式TRT透平机叶片失效机理研究

国内干式TRT透平机叶片失效主要有磨损、腐蚀及积灰三种形式，而透平机转子动叶片失效将造成转子动不平衡，导致设备振动故障停机。从透平机叶片失效的形式出发，研究影响叶片失效的因素，并针对叶片失效问题研究应对措施，延长设备的使用周期。     

高线碳化钨辊失效原因分析及改进

针对天铁棒线厂1#、2#线碳化钨辊的失效现象进行了分析,总结出碳化钨辊失效的8种主要形式,找出了8种碳化钨辊失效产生的原因,通过制定改进措施,减少了碳化钨辊失效的几率,延长了碳化钨辊的使用寿命,降低了生产成本,提高了经济效益.     

硬质合金轧辊的使用失效和预防研究

为合理、高效地使用硬质合金轧辊,通过对硬质合金轧辊在使用中出现的失效形式进行分类,结合硬质合金显微组织特点,总结了失效的主要原因,提出了预防方法。     

硬质合金截齿齿头的失效分析

运用扫描电镜等手段对神府煤田失效的采煤机截齿齿头（ＷＣＣｏ硬质合金）进行了失效分析，明确了该煤田截齿齿头的主要失效形式为崩齿、磨损和掉块。在断口分析的基础上阐明了造成失效的主要因素：冲击载荷达到或超过合金抗弯强度，煤层中的夹矸石对硬质合金的磨粒切削作用，周期载荷及热摩擦引起的冲击疲劳和热疲劳龟裂；并针对这些失效原因提出了延长截齿寿命的方法。     

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.