微力张减径的工艺参数选定

介绍了微张力减径工艺中单机架减径率、孔型椭圆度、张力系数工艺参数的选定原则和选定范围，认为其最佳范围是单机架减径率３％～５％，宽度系数０．９７５～１．０２５，张力系数０．２５～０．４５。     

微张力减径的工艺参数选定

介绍了微张力减径工艺中单机架减径率、孔型椭圆度、张力系数工艺参数的选定原则和选定范围，认为其最佳范围是单机架减径率３％～５％，宽度系数０．９７５～１．０２５，张力系数０．２５～０．４５。     

无缝钢管张力减径过程内六方产生的模拟分析

根据无缝钢管张减过程的变形特点,利用MSC.Marc软件建立了三维热力耦合有限元分析模型,对18机架张力减径试轧产品进行数值模拟,模拟结果与实测数值的对比表明建立的分析模型实用可靠,精度较高.通过研究各机架出口断面不同点的壁厚变化,得出减径后钢管横向壁厚分布不均,探讨了内六方缺陷产生的原因.该模型的建立为分析产品缺陷、指导工艺设计提供了依据.     

厚壁管内六方缺陷消除方法探讨

文章主要分析介绍了无缝钢管生产中,定径机轧制特厚壁管"内六方"缺陷产生原因,并且通过增加轧制道次、减少各机架减径率及椭圆度系数的方法来控制厚壁管内六方缺陷的产生,从而改善厚壁管壁厚精度,提高成品管一级品率和金属成材率.     

中厚壁钢管微张力减径时内不规圆的研究

对中厚壁钢管在微张力减径过程中出现的内孔不规圆现象进行了研究，分析了内六方和内三角的形成机理，根据生产实践经验，建立了椭圆度方程。并提出了消除内不规圆的措施。     

张力减径钢管质量缺陷及预防

张力减径是热轧无缝钢管生产中不可缺少的一道轧制工序,钢管在经过减径机后容易出现一些质量缺陷.文章详细介绍了钢管在张力减径后容易产生质量缺陷及其形成原因和预防.     

微张力减径中常见产品缺陷的成因及消除方法

介绍了钢管在微张力减径过程中常见的缺陷，分析了其形成原因，探讨了缺陷消除的方法。     

圆孔型系统张力减径后钢管横向壁厚不均匀性的模拟

用有限元法模拟152．5BR圆孔型系统主变形四机架连轧过程发现：张力减径后钢管的横向壁厚分布不均匀,产生内六方趋势,内六方趋势的大小与主变形机架的数量呈直线关系。利用这种关系可预测152．5BR圆孔型系统生产的各种规格钢管的横向壁厚不均匀程度。实际生产轧制试验证明了该有限元模拟结果的正确性。     

Φ340mm十机架微张力减径机简介

简要介绍了Ф340mm十机架微张力减径机的工艺参数、设备组成及控制系统。     

张力对（微）张力减径机力能参数的影响分析

影响（微）张力减径机轧制能力的因素主要包括:单机架减径率、单机架变形量、轧制荒管规格、轧制温度、  轧制速度、机架间张力等。主要研究分析在单机架减径率及变形量确定的情况下,机架间张力对轧制负荷的影响,  以指导实际生产过程中如何利用张力的变化来控制减径轧制在正常负荷下的运行。结果表明:平均张力系数Z_m 越大,减径轧制时各机架的轧制负荷越大;平均张力系数Z_m不变,各机架的轧制负荷随机架间张力增大而增大。     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.