棒线生产中轧件通条尺寸稳定性的工艺研究

从孔型、堆拉钢关系、导卫方面分析了棒材生产中轧件通条尺寸稳定性的影响因素,通过优化孔型系统、改进成品进口导卫、规范轧线操作,大大提高棒材生产轧件通条尺寸。     

珠海粤钢棒线材孔型共用的设计与应用

珠海粤裕丰钢铁公司棒材和高速线材车间建在同一厂房,分别布置在相邻两跨,作为同一车间组织生产和管理。但是,生产直条棒材和高速线材轧制工艺存在较大差别,因此,原棒材和高速线材工艺孔型设计为单独设计。在实践生产中,员工对两种工艺布置和生产准备作业存在不适应性。经过多年不断的技术积累,逐步将两条线孔型设计整合共用,实现棒材和高速线材前10个道次孔型尺寸、轧制料型和工艺布置共用。有效降低了员工的工作量和轧辊备件资金积压,提高生产作业率和日常换辊检修效率,获得了较大的经济效益。     

小型棒材连轧生产系统

本文着重阐述了小型棒材生产轧机、工艺布置、轧机类型的选择、机组特点及孔型系统，对特定工艺参数配置下的孔型选择作了介绍。     

棒材多道次轧制过程数值模拟

以棒材轧制过程为研究对象,运用Marc商用有限元软件建立了典型孔型下的棒材多道次轧制模型。通过数值模拟得到了金属变形规律、温度场及力能参数等。模拟结果不仅可以深入分析轧件金属在各种孔型中的变形机理,还可以为实际生产和工艺优化提供有效参考。     

大规格合金钢棒材孔型设计及分析

在传统的中小型棒材孔型设计的理论和经验的基础上,对大规格合金钢棒材孔型设计进行了分析,并根据国内外的设计经验,以Φ150 mm棒材的孔型为例,对产品质量有决定意义的成品孔型系统和精轧孔型系统(椭圆孔、立孔和扁孔)的设计与分析.经现场实践验证,取得较好的效果.     

玉钢棒材四切分轧制技术开发实践

昆钢王钢新建棒材线应用四切分轧制技术轧制棒材,对四线切分轧制的孔型设计、切分原理、电机校核、实际生产过程中的问题及改进措施进行分析总结。     

精密钛合金棒材三辊减定径机组

结合三辊轧制的优点,提出在钛合金棒材精轧机之后增加1架弧三角孔型三辊轧机和4架三辊可调切线孔型减定径机组,来减小棒材尺寸公差,同时采用有限元分析对通过该机架的变直径棒材进行模拟轧制,最终获得了尺寸公差精度完全符合要求的产品。通过模拟和现场实测结果说明在钛合金棒材精轧机后增加三辊组合孔型轧机的方法是完全可以提高钛合金棒材的尺寸公差。     

棒材生产粗中轧无孔型轧制中轧出口料型头部肥头攻关

通过分析棒材生产粗中轧无孔型轧制中轧出口料型头部肥头产生的原因,优化滑动导卫耐磨板间隙、1#剪剪切、轧件张力判断与调整、加热钢坯出炉温度的控制和中轧10架孔型优化,解决了中轧出口料型头部肥头的问题,实现了粗中轧无孔型轧制生产稳定.     

小规格合金钢生产线工艺优化实践

通过优化φ550 mm×1粗轧工艺、设计差异化翻钢板、采用孔型两侧用切线连接的扩张角法设计成品孔型、改进冷剪孔型剪刃等措施,解决小型合金钢棒材生产线制约生产的的瓶颈问题,实现产品质量升级。     

八钢连续棒材生产线生产弹簧扁钢工艺技术

通过设计孔型、制定加热工艺、轧制工艺,修改电气程序,实现弹簧扁钢在连续式棒材生产线的生产.     

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.