加强电炉钢短流程生产工艺研究与技术开发的建议

论述了加强电炉钢短流程生产工艺研究与技术开发的必要性和主要课题，并提出关于组织合金钢短流程生产工艺研究与技术开发“九五”国家科技攻关及提高高研究开发投资强度的建议。     

建设中的现代化钢厂—珠钢

本文介绍了建设的珠江钢厂的基本情况。珠钢采用ＵＨＥ电炉－精炼－薄板坯连铸连轧这一世界先进短流程生产工艺，分两期建设，计划１９９９年投产。     

最大的达涅利电弧炉之一——埃及AINSUKHNA EZZ带钢厂电弧炉

在过去的几年内,以电炉为主要冶炼设备的短流程钢厂,逐步进入以传统式联合钢厂生产工艺路线占主导地位的生产领域。这里有着多方面的原因,但最主要的原因是,短流程钢厂的生产成本和吨钢年生产能力投资都比较低。然而,就钢中的残留元素和氮含量来说,电炉钢通常高于转炉钢,这显然     

引进高功率电炉 发展特殊钢生产

本文介绍了江西钢厂引进美国二手设备的消化及运行情况,提出了高功率电炉必须与精炼炉、合金钢连铸等新技术配套,形成电炉——偏心底出钢——精炼炉——合金钢连铸的优化特殊钢生产工艺流程。     

我国电炉炼钢的发展现状与前景

现代炼钢流程主要是转炉流程和电炉流程。2004年世界粗钢产量达10.548亿t,其中转炉钢66452万t,占63%,电炉钢35652万t,占33.8%。我国钢产量27470万t,其中转炉钢23271万t,占84.72%,电炉钢4167.1万t,仅占15.17%。本文分析我国不同时期电炉钢比例逐年下降的原因,讨论为什么要重视电炉钢的发展,指出在目前我国废钢资源及电力紧缺的条件下,发展电炉炼钢的方法及技术措施,认为目前应考虑对发展我国现代电炉炼钢的第二轮投资。一、国外电炉炼钢的发展情况自上世纪中叶至今,尽管转炉炼钢技术取得了长足的进步,但世界电炉钢比例不断增长,从1950年的7.3…     

LG40Cr汽车发动机连杆用钢的开发

莱钢特钢事业部采用50 t电炉短流程生产工艺开发了连杆用LG40Cr钢,根据其技术要求设计合理的生产工艺过程,针对关键技术加强过程和关键参数控制,并对生产的203炉LG40Cr钢化学成分、力学性能、低倍和非金属夹杂物进行统计分析。结果表明,LG40Cr钢成分及各项性能稳定,综合性能优良,满足连杆用钢高洁净度、高均质化、高性能稳定性的要求。     

特殊钢冶炼技术的近期进展

对用电炉流程，转炉流程和特种冶金方法生产特殊钢的冶炼技术的近期进展作了综述，并结合我国现状，指出必须加强合金钢短流程生产工艺研究和技术开发，重视转炉流程生产合金钢技术的应用。     

偏心炉底出钢技术在60t UHP电弧炉上的应用

1 概述 在电炉—炉外精炼—连铸短流程生产工艺中,为了给炉外精炼创造条件,为生产合格连铸坯奠定基础,世界各国对无渣出钢方式做了大量的探索,终于在八十年代初由德国的德马克公司、蒂森公司和丹麦的DDS厂率先联合开发成功了偏心炉底出钢技术(EBT),该项技术除了能做到无渣出钢外,还     

LG40Cr汽车发动机连杆用钢的开发

采用50t电炉短流程生产艺开发了连杆用钢LG40Cr,根据其技术要求设计合理的生产工艺过程。对生产的147炉钢的化学成分、力学性能、低倍和非金属夹杂物进行统计分析,结果表明,LG40Cr钢在成分及各项性能方面都有很高的稳定性,满足连杆用钢高洁净度、高均质化、高性能稳定性的要求。     

30t偏心底电炉的实践

简要介绍改造成偏心底出钢的30t电炉的生产工艺，分析了EBT出钢工艺条件下冶炼系统的技术经济指标和产品质量，通过与原出钢工艺的对比，凸现出EBT工艺的优越性。     

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.     

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.     

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。     

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.