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.     

连铸坯切分轧制大型H梁的新方法

摘自《Trans.ISIJ》,1988,Vol.28,No.6 至1980年9月用切分轧制方法(Split rolling method)生产H梁的工艺才被应用到实际生产中。这种方法是在具有五个孔型的(4个不同的轧边孔型和一个精轧孔型)粗轧机上,250 mm厚的板坯在前4个孔型进行8道次的轧边,在最后一个精轧孔型压缩梁辐的厚度。其轧制特点是在轧边的过程中轧材不形成狗骨形。具体轧制过程是,用第一个轧边孔型中的锋利楔块从坯料横端侧面中心处将坯料切分,切分     

连铸坯切分轧制大型H梁的新方法

摘自《Trans.ISIJ》,1988,Vol.28,No.6 至1980年9月用切分轧制方法(Split rolling method)生产H梁的工艺才被应用到实际生产中。这种方法是在具有五个孔型的(4个不同的轧边孔型和一个精轧孔型)粗轧机上,250 mm厚的板坯在前4个孔型进行8道次的轧边,在最后一个精轧孔型压缩梁辐的厚度。其轧制特点是在轧边的过程中轧材不形成狗骨形。具体轧制过程是,用第一个轧边孔型中的锋利楔块从坯料横端侧面中心处将坯料切分,切分     

斜轧头孔型在开发冷拔异型钢中的应用

介绍了传统轧头孔型及轧头产生的情况,以及改进后斜轧头孔型及轧头时产生的情况.对冶金企业生产有一定的指导作用.     

高精度园钢的孔型介绍

轧制高精度园钢,目前各国一般均采用园——园孔型系统。该系统中每个孔型的轧槽半径是相等的,但随着孔型大小变化而递减。最后的两个孔型轧槽是用同一半径构成的。下面研究的是由四个园孔型构成的孔型系统(见图1),按轧制顺序第一个孔型叫粗轧孔型、中间的二个叫精轧前孔型、最后的一个叫精轧孔型。孔型的构成要素有:轧槽半径ri,张开角β_i;切线段     

斜轧孔型工艺H型钢初轧过程模拟仿真分析

为优化H型钢产品孔型工艺,提高孔型设计精度,利用有限元软件,对100mm×100 mm规格H型钢产品的初轧孔型进行轧制过程模拟计算,得到各道次轧件在变形过程中的孔型充满度、金属流动性以及应力应变的仿真结果.分析表明:在斜轧孔型初轧过程中,各孔型均未完全充满,K2、K3、K4孔型的闭口腿内侧金属与轧辊有脱离现象发生.K1...     

10#槽钢在Φ300 mm轧机上的试制和孔型优化

介绍了用150mm方坯作原料,通过Φ400mm轧机开坯、切深定型在Φ300mm轧机上生产10#槽钢的实际情况.孔型系统是在原采用90mm方坯轧制10#槽钢的基础上,对原有孔型系统进行了优化.150mm方坯粗轧孔型系统与原孔型系统进行了衔接,对试轧情况进行了总结.     

圆管在六边形孔型中的金属流动规律

本文模拟自由浮动长芯棒的轧制过程,试验研究了圆管在六边形孔型中的金属流动规律,分析了在这种孔型中轧管的变形特点和六边形孔型"口袋"的重要作用.     

中轧厂9#、10#角钢开发与孔型设计

简述了中轧厂9#、10#角钢开发的孔型设计、试轧和孔型改进以及改进后的效果。     

150 mm×150 mm连铸坯生产180～200 mm规格翼板钢粗轧孔型设计改进

山东鲍德翼板有限公司翼板钢粗轧系统采用箱形孔7道次,其中1道为立轧孔,由于轧槽深度大,极易发生断辊事故.为此,改进孔型设计,全部采用箱形孔型系统,由7道次改为5道次,并增强了孔型系统及其附属工装导卫的通用性,缩短了换辊时间.改进后,提高了轧制速度,日产量由1 200t提高到1 600t.     

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.