LF精炼工艺优化

介绍了邯钢西区邯宝炼钢厂精炼工艺的布置形式及生产特点。对生产中存在的问题做了细致的分析,提出了LF二级系统建立自动精炼模型的想法,并对该模型的各个环节做了细致、系统地分析。优化后实行了标准化作业,2013年每炉钢缩短了8 min精炼时间,全年增收(节支)3 000多万元,并且建成了邯钢第一个LF自动精炼模型。     

网络自动化系统在炉外精炼中的应用

介绍了济钢第三炼钢厂炉外精炼系统中网络自动化系统的应用。网络自动化系统由一级基础自动控制系统和二级过程模型控制系统两级网络构成,采用Ethernet工业以太网和Modbus Plus两种通讯技术,完成生产管理和动态冶金模型的功能,实现了炉外精炼的网络自动化控制。     

萤石市场前景分析

萤石(CaF_2)按用途分为冶金级、酸级和陶瓷级。冶金级萤石主要用于钢铁和其它金属的粗炼及精炼中脱硫、脱磷,同时也作冶金助熔剂和添加剂之用。酸级萤石主要用途是制造氢氟酸,在石油精炼以及轻工、航天等部门作催化剂、反应介质、金属浸渍剂等。铝工业及化学工业     

工业硅全自动精炼系统的工艺研发及应用

介绍了全自动精炼系统在钢铁行业属于成熟的技术,而在工业硅精炼方面还没有应用。文章论述了工业硅全自动精炼系统的工业研发及应用,此系统具有良好的经济效益、社会效益和前景,对于促进铁合金行业的发展和进步具有重大意义。     

精炼摇炉自动控制系统

从精炼摇炉生产工艺流程入手,介绍了精炼摇炉自动控制系统的构成,并分析了燃烧系统、氧化还原系统、炉体倾动及炉门控制、余热锅炉系统、排烟收尘系统、冷却水系统等控制系统的具体控制功能。     

1000MW级汽轮机转子锻用钢精炼渣系的设计

针对1 000 MW级汽轮机转子锻用钢的低硅低铝和钢种夹杂物要求高的特性,对LF精炼和VD真空精炼熔渣进行了研究。结合相图,并通过渣样分析,发现采用CaO、CaF2作造渣材料,精炼渣位于高熔点区域。真空处理前在新设计的精炼渣系中添加5.0~6.0 kg/t的硅石,通过降低碱度来改善精炼渣的性能。真空处理后精炼渣处于低熔点区域,吸附夹杂物的能力强。新设计的精炼渣冶炼的百万千瓦级汽轮机转子锻用钢非金属夹杂物≤1.0级。     

攀钢炼钢技术的发展方向及对策

介绍了对欧洲几家钢铁公司进行考察后,这些公司在炼钢、精炼、连铸工艺中的特点。针对攀钢炼钢系统中存在的不足,提出了要实现全脱硫、且精炼、全连铸,必须对现有的铁水预处理、转炉炼钢、钢水精炼及连铸工艺进行变革,并提出了在炼钢系统实现自动控制及计算机管理的必要性。     

RH精炼烟气在机械真空系统中的检测方法及应用

在分析了传统RH精炼烟气检测方法及国内已有机械真空系统配套烟气检测装置存在的问题基础上,采用了激光气体分析仪。结合RH精炼机械真空系统的特点,对激光气体分析仪的结构密封、吹扫控制进行了改造设计,将其前置在布袋除尘器之后和真空系统入口之前,使得RH精炼烟气成分检测响应时间由3～5 min缩短到3～5 s,为精炼工艺操作提供了可靠依据。     

金隆工程火法精炼与浇铸

本文介绍了大法精炼及浇铸的工艺设备与工艺过程，同时围绕火法精炼及浇铸工艺阐述了重油燃烧系统、氧化还原系统、排烟气系统、冷却系统、操作控制系统的设计，并列举了部分设计指标与实际投产指标值，从而证明该设计是成功的。     

三层液精炼铝工艺技术初探

随着国民经济的发展,随着电子工业及航空航天技术的发展,对精铝的需求越来越多。本文从精炼铝的主要用途、精炼铝的主要生产工艺及三层液精炼铝工艺技术方面进行了系统的阐述,对认识及发展我国的精铝工业进行了有意义地探讨。     

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.