铜冶炼炉渣选矿自动化技术的现状

总结了目前国内铜冶炼炉渣选矿厂的自动化水平,重点介绍了渣包喷淋无线控制系统,炉渣破碎及输送控制系统,半自磨给料控制系统,旋流器给料压力控制系统,浮选液位、充气量控制系统等一些应用成熟的典型自动化控制系统,并分析了铜冶炼炉渣选矿自动化未来的发展方向。     

集散控制系统在原料厂的应用

分析了集散控制系统的体系结构,结合原料厂控制系统的控制要求和工艺流程,说明了原料厂控制系统采用集散控制系统的技术优势,并阐述了基于现场总线技术的集散控制系统的总体方案和实现方法,研究了原料厂集散控制系统在硬件设计、软件设计和通讯实现方面的技术问题.     

带钢位置控制系统在冷轧中的应用

为了解决生产中带钢跑偏问题,许多厂家都引进了带钢位置控制系统,以便把带钢精确地控制在机组中心线上,目前较为常见的控制系统有电容式控制系统、电感式控制系统、光电式控制系统等等.本文主要讲述了电容式带钢位置控制系统的工作原理及系统基本组成.     

无控制工质电液调节系统改造背压机组的可行性分析

分析了B25机组控制系统改造的必要性,简要介绍了无控制工质电液调节控制系统的特点,结合无控制工质电液调节控制系统的特点,对B25机组改造的可行性进行了分析,为机组的控制系统改造提供了参考。     

大型冶金矿山主控制系统与子控制系统的通讯集成

针对大型冶金矿山主控制系统与众多大型设备自带控制系统品牌型号不同和通讯协议不同,导致各成体系,相互之间不能通讯,从而使整个矿山生产不能实现集中监控,同时造成建设投资高、维护量庞大的问题,进行了大型冶金矿山主控制系统与子控制系统的通讯集成设计。实践表明,课题的实施解决了大型冶金矿山主控制系统与子控制系统通讯集成问题,实现了大型冶金矿山的集中监控,降低了工程投资,减小了维护量,具有很大的推广应用价值。     

3AⅡ-13型煤气发生炉自动加煤控制系统技术改造

本文分析了煤气发生炉原有控制系统的缺点和不足,在此基础上对控制系统进行了技术改造,降低了控制系统的故障率,使操作更加简单、维修更加方便。     

热轧平整机电液伺服系统的分析

热轧平整机液压伺服系统分为推上(或压下)部分和弯辊部分,包含轧制力闭环控制系统、位置闭环控制系统和正负弯辊控制系统。以某热轧厂平整机为例,对这套控制系统的模式进行分析,并阐述了闭环控制系统的特性。     

浅议安钢能源管理控制系统

介绍了能源管理控制系统的原理及功能。结合安钢实际情况,阐述了建立能源管理控制系统的必要性,就建立能源管理控制系统中面临的问题及解决方法进行了探讨。     

总线控制系统在铜钴尾矿复垦项目的应用

通过介绍总线控制系统在铜钴尾矿复垦项目上的实际应用,详细分析了该总线控制系统的系统结构和网络架构,并总结了该控制系统的特点,为今后控制系统设计及应用提供了一种参考方案。     

三大控制系统的实际应用及发展

计算机技术的飞速发展及在各领域实际工作中的广泛应用,推动了计算机控制系统的理念不断更新。正确理解三大控制系统,合理应用控制系统,把握控制系统的发展趋势是最大限度运用计算机技术的关键,也是实现控制系统数字化、网络化、信息化的必然要求。     

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.