承钢1780线精轧机的减速机螺栓断裂分析

介绍了对承钢1780生产线F1精轧机减速机输入轴固定螺栓和F3精轧机减速机地脚螺栓断裂的断口形貌.对其最大承受力和直径进行了计算,对其微观组织进行了分析,找到了这两起螺栓断裂失效的原因,给出了相应的解决措施.     

预精轧机轴承失效分析及结构改进设计

通过对某预精轧机传动装置中输入轴上的严重轴承失效以及由此对输入轴上螺旋锥齿轮副的啮合产生的不良影响等故障进行研究 ,分析了轴承失效的主要原因 ,据此提出了几种相应的结构改进设计方案 ,并对各改进方案的轴承进行寿命校核及优缺点比较 ,找到了最佳的结构改进方案。     

摩根45°侧交无扭轧机锥箱轴承失效的分析与研究

水城钢铁（集团）公司第一轧钢厂准高线车间的精轧机组采用的是摩根三代45°侧交无扭轧机,锥箱轴承采用的是美国摩根公司进口的全套轴承,其中8／6″锥箱内的MR-126-KC10轴承（以下简称轴承A）和MR-7310PD7B（以下简称为轴承B）上机运转才9天就失效了,远远小于设计的轴承寿命。由于摩根轴承价格昂贵,所造成的损失大,因此急需对轴承的失效原因进行分析。主要从轴承的材料和理论负荷校核等方面对摩根轴承的失效原因进行了研究。     

硬齿面减速机疲劳分析

对张钢热轧厂精轧机组中１＃主机列主减速机疲劳损坏进行了综合分析,认为减速机疲劳损坏的原因主要是加工制造过程中出现的质量问题和工艺设备选型不当,针对损坏原因,采取了更换齿轮轴材料、减轻负载、加强润滑等措施,保证了正常生产。     

韶钢炼轧厂棒二线18号轧机组主减速机润滑系统改进

对炼轧厂棒二生产线18号精轧机组在高速轧制状态下主减速机轴承故障进行分析,提出了润滑系统的改进措施,实现了高速轧制要求.     

滚动轴承的白色腐蚀裂纹失效

白色腐蚀裂纹(WEC)为不同于经典滚动接触疲劳(RCF)的轴承失效机制,因通常导致轴承早期失效而成为目前最受关注的轴承失效机制之一。对WEC失效与经典RCF的差异进行了概述,并以台架测试研究了多种附加载荷、轴承材料及其热处理和表面涂层对轴承WEC失效寿命的作用,以及钢的洁净度对轴承WEC失效和经典RCF寿命的不同影响。证实了附加载荷是发生WEC失效的必要条件,改善钢的洁净度可显著提高轴承经典RCF寿命,但不能作为提高轴承WEC失效寿命的有效方法。     

立辊轧机四列圆锥滚子轴承保持架有限元分析

针对某轧板厂立辊轧机辊颈四列圆锥滚子轴承保持架断裂事故,建立了轴承系统有限元模型;在轴承元件间重要接触位置采用接触单元建立了面-面接触对.仿真得到了保持架的变形和应力分布情况,找出了轴承保持架断裂的原因,并对今后此类轴承的设计提出了改进建议.     

在役平台结构剩余疲劳寿命的可靠性分析

对在役平台结构的剩余疲劳寿命的可靠性分析方法进行研究.论述疲劳谱分析方法的基本原理,研究在役平台结构剩余疲劳寿命可靠性分析中的不确定性因素,建立剩余疲劳寿命的失效方程,并对参数的敏感性进行分析.结果表明,所建立的剩余疲劳寿命的极限状态方程较好地考虑了在役平台结构剩余疲劳寿命分析中的不确定因素,可为在役海洋平台的剩余疲劳寿命的可靠性分析提供参考;利用可靠性分析方法,以目标可靠性指标为基础,可对在役平台结构剩余疲劳寿命做出更为科学的评价;敏感性分析显示,疲劳应力的不确定性对可靠性指标影响最大,而疲劳设计参数的不确定性可以忽略.     

振动输送机连杆的疲劳断裂与改造

连杆是振动输送机的主要基础部件之一 .通过对振动输送机连杆失效原因和受力分析 ,认为连杆失效是疲劳断裂所致 .加大连杆截面尺寸 ,减少交变应力中的最大应力值 ,从而可以提高连杆的疲劳寿命 .实践表明 ,改造是成功的 ,取得较好经济效益 .     

PeakVue 技术在诊断钢管轧机轴承故障上的应用

介绍了应用PeakVue技术诊断钢管轧机减速机轴承的工作状态。通过对F2减速机轴承进行振动监测,以及对PeakVue峰值的研究,准确诊断出F2减速机轴承的劣化及损坏程度,并依此制订出此轴承的寿命周期曲线。     

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。     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

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.     

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。     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.