棒线步进式冷床的运动分析及局部优化设计

棒线步进式冷床结构复杂,其动静齿条的齿形及床面齐头辊道的设计直接影响到轧件的成型质量。对步进式冷床进行了主轴偏心轮、动齿条框架的合成运动分析,采取了床面齐头辊道模块化悬挂、短静齿条优化设计,降低了装配累积误差量,提高了轧件成型质量。     

步进式冷床升降机构偏心轮滚动轴承频繁损坏的解决

着重阐述了马钢第三钢轧总厂方坯连铸机步进式冷床升降机构偏心轮轴承频繁损坏的原因分析及采用滑动轴承替代的解决措施。     

计算机仿真在链式冷床设计中的应用

链式冷床是钢管生产中的常见设备,钢管在其上面通过断续横向滚动获得较好的冷却效果和直度效果。常见的链式冷床有单向链式冷床和双向链式冷床。综合了两种冷床的特点,简析了计算机仿真在链式冷床设计中的一些应用,通过拨爪受力的变化,确定冷床倾斜角,使其更好的实现了设计功能。     

无缝钢管生产线冷床及选型

冷床是无缝钢管生产线上必不可少的设备,冷床的形式有多种,可根据生产需求的不同进行选择.总结了单链冷床、双链冷床、新型链式冷床、步进齿条式冷床、螺杆式冷床等各种冷床的优缺点,介绍了无缝钢管生产线上各种冷床的结构、工作原理及特点,为用户选择和设计冷床提供了参考.     

滚盘式冷床在钢管生产线中的应用

介绍了滚盘式冷床及目前使用中的螺旋冷床,链条滑轨冷床、步进齿条冷床的原理及特点.     

3800mm炉卷生产线冷床设计主要问题探讨

就3 800 mm炉卷生产线冷床设计中的几个主要问题进行了探讨,确定了冷床的型式、上下料装置的型式及冷床的润滑方式,计算出了需要的冷床面积,并给出了建议的冷床尺寸。     

空冷过程T型钢放置角度对温度场分布影响

T型钢以某一倾角放置于冷床上进行空冷,由于其横截面的非对称特性及重力的影响,在冷却过程各面冷却并不均匀,这引起的热应力使得T型钢下冷床产生严重的弯曲变形。本文给出了通过数值计算获得T型钢表面换热系数的方法,并系统的研究了T型钢在冷床上的不同放置角度对其冷却时间及断面温度场分布的影响,研究结果可为实际的冷床齿形倾角设计提供依据。     

连轧棒材线冷床区液压系统的改进及故障排除

针对杭钢小连轧棒材线冷床区液压系统存在的问题 ,分析了其产生的原因 ,并提出了相应的改进措施 ,特别介绍了冷床卸料小车液压故障的排除过程     

液压冷床在大棒生产线的应用

介绍了一种应用于大棒材生产线的液压冷床,叙述了冷床的结构,介绍了不同规格产品在冷床上运行的原理,最后计算验证了冷床的承载能力。该冷床在石家庄钢铁有限公司营口生产线上得到成功应用。     

连铸翻转冷床的设备改造与经验

介绍方坯连铸步进式翻转冷床的结构及特点,针对该冷床所存在的问题,分析其原因,实施改造措施,取得了明显的经济效益,同时为同类型铸机设备提供了有益的启示。     

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.     

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.     

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.