25#槽钢孔型设计及完善

介绍中型厂生产25#槽钢的轧制孔型设计过程，以及生产效果。     

25#槽钢孔型设计及完善

介绍中型厂生产25#槽钢的轧制孔型设计过程，以及生产效果。     

Φ 500mm轧机轧制16号轻型槽钢的孔型设计

介绍了唐山华顺钢厂在φ500mm轧机上开发16号大规格轻型槽钢的切深孔、变形孔、成品孔的孔型设计。经生产实践表明该产品研发获得成功，实现了小轧机上轧制较大规格的轻型槽钢，其产品质量满足国家标准要求，成材率达到93．2％，合格率为99．3％。     

槽钢轧制工艺设计和生产实践

文章通过槽钢孔型设计的技术特点出发。研究槽钢的工艺设计与实际生产的课题。1 前言 650轧机既能开坯又能轧制中型材的特点,在我国钢铁联合企业中曾发挥着杰出的贡献。随着连铸坯和一火成材技术的发展,650轧机开坯的使命走向终结,其中心方向是转向轧制中型材。本文介绍系列槽钢生产工艺的控制和槽钢孔型设计的一些体会。     

柳钢中型连轧异地改造工程竣工投产

柳钢构筑600万吨框架规模的重点工程——中型连轧异地改造工程建成投产。该生产线设计年生产能力60-80万吨，产品以工字钢、槽钢、角钢、圆钢等系列品种为主，产品规格有工字钢10#-18#、槽钢6．3#-22#，角钢6．3#～16#，圆钢D40～110mm，根据市场需要，     

槽钢初轧孔型设计的模拟优化计算

针对槽钢初轧孔型优化过程中因工艺设计缺陷出现的各种问题,对轧制过程进行模拟轧制计算,为孔型设计提供孔型充满度、金属位移流动规律并提出优化建议。结果显示:矩形坯料在开坯孔型的充分夹持有利于实现开坯切分;槽钢孔型内侧R角位置的金属最为活跃,可以平衡调节腿部与腰部金属位移;槽钢"假腿"设计不仅可作为腿部尺寸平衡,也利于腿部金属的增加。     

大钢模板施工技术在高层建筑中的应用

文章通过大钢模板施工技术在高层建筑剪力墙施工中的应用实例,介绍了大钢模板的设计、施工工艺及使用效果,为高层建筑中清水砼剪力墙的施工提供了成功的经验。     

B_5b犁壁钢的研制

前言过去我国犁壁都是采用低碳钢(B_2或A_3)经渗碳淬火制造,工艺落后,质量不稳定。1976年后,相继研制成功低碳马氏体35号钢犁壁和95—B2—95三层复合板犁壁,使我国犁壁生产向国际水平迈了一大步。但这两种钢都属于优质钢,三层复合板生产工艺难度也较大。为了降低犁壁成本,适应农机产品价廉耐用的要求,提出用半镇静钢B_5b制作犁壁进行试验。 B_5b钢是武钢用来轧制11号、12号矿用工字钢的材料,在煤炭部各矿区享有较高的信誉,但从未用B_5b钢生产过板材。本试验将B_5b钢轧成8mm板制作犁壁,无疑又对B_5b钢开辟了一种新用途。     

40a槽钢孔型设计

介绍了河钢唐钢型钢厂为满足市场需求,在经典孔型理论的基础上,辅以有限元模拟工具,开发大规格槽钢孔型系统的过程。该系统在大型钢生产线应用后,实现了400 mm高大规格40a槽钢的稳定批量生产。其成品孔、控制孔及切分孔孔型设计方法及侧壁斜度的选择,为高度300 mm以上大规格槽钢孔型设计提供了参考。     

矫直工艺对槽钢质量的影响

就槽钢轧制后的形状特点，提出了矫直工艺的关键，并介绍了槽钢矫直银辊型设计及矫直调整等。     

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.