铝电解工艺对能耗的影响及其数学模型

本文以云南铝厂的自焙槽为对象,对铝电解工艺与能耗的相互关联进行了实验研究。通过现场的工业试验,建立了铝电解单位能耗与工艺参数之间的数学模型,为铝电解生产节能提供了一定的指导依据。     

铝电解生产中节能降耗措施探析

在工业快速发展阶段,对铝电解行业发展起到了带动作用,但由于受能源危机与环境问题等因素影响,铝电解生产面临着巨大节能降耗压力。本研究简要探讨铝电解行业节能降耗背景及现状,对当前铝电解生产方法及技术做出深入分析,并针对性地提出相关节能降耗措施,以期推动铝电解行业的绿色、可持续发展。     

我国铝用氟化盐工业现状

我国铝用氟化盐工业现状黄河铝业有限公司王洪氟化盐做为铝电解的熔剂，对于铝电解生产具有相当重要的意义。尤其是冰晶石和氟化铝能否正常供给，决定铝电解生产能否延续。所以对氟化盐市场和生产的调研对铝电解企业来讲是必须的。一、市场近况铝用氟化盐主要是指冰晶石和...     

铝电解供电监控系统的综合自动化设计与实现

随着铝电解供电综合自动化技术的发展,其应用越来越广泛。我国铝电解工业还需要进一步加强研究,使用具有较强专业性以及先进技术的铝电解综合自动化系统,能够有效的促进其发展。基于此本文分析了铝电解供电监控系统的综合自动化设计与实现。     

铝电解多功能天车电气系统调试

随着经济和科技的快速发展,铝电解生产技术也不断进步,从早期的自焙槽发展到今天的多点进电大型预焙槽,自动化程度不断加深,进行铝电解的效率和经济效益不断提高,也降低了铝电解工业对环境的污染。在铝电解生产加工中,最为重要最关键的设备是铝电解多功能天车,即铝电解多功能机组,铝电解天车能够在高温强磁场、大电流和多粉尘的环境中完成铝电解生产的各个环节和步骤,对于提高铝电解的生产效率具有重要的作用。为此本文针对铝电解多功能天车的电气系统控制组成进行了阐释,并总结了其程序编写的要求,并详述了多功能天车电气系统进行调试的整个过程。     

浅析预焙铝电解槽阴极内衬破损特征与机理及检测维护措施

预焙阳极铝电解槽是电解铝生产中最主要的设备,特别是当前我国节能减排当作国家第一大事的前提下,铝电解工业正在向大型高效预焙阳极电解槽发展,铝电解槽寿命直接关系到铝电解工业的效益好坏。     

铝电解工业碳排放核算方法

铝电解工业作为能源型产业,生产过程中会排放二氧化碳,大量火电消耗亦会导致大量二氧化碳排放,但其碳排放核算边界、核算方法等尚存在诸多不明晰之处。分析了铝电解工业碳排放核算现状,确立了铝电解不同生产阶段中碳排放分别核算、加和求总的核算原则,分别列出了焙烧启动过程碳排放、正常电解过程中预焙阳极消耗碳排放和能源消耗间接碳排放、阳极效应过程碳排放以及铝电解碳排放总量核算公式,并选取相关数据进行了实际核算。     

预焙槽炼铝添加锂盐工业试验

<正> 八十年代以来,锂盐做为一种能源材料广泛应用于铝电解工业。1980年美国锂公司和福特公司共生产碳酸锂2.48万吨,其中25％用于铝电解工业。美国用含锂盐电解质所生产的原铝,约占其铝总产量的三分之     

微机控制铝电解槽生产增产降耗试验研究

当前我国能源供应紧张,尤其是电力供应更为紧张,铝电解生产能耗大,素有“电老虎”之称,随着铝工业的发展,不仅给能源工业带来很大压力,也严重影响着铝工业本身的发展,因而如何降低铝电解的能耗是发展铝工业的当务之急。     

提高铝电解电流效率的方法分析

随着铝工业的快速发展,对铝电解电流效率也提出更高的要求。然而实际生产中可发现,铝电解电流效率所涉及的参数多以多变量为主,若操作技术、控制水平较差,将会制约电流效率进一步提高,加上较多操作工序、磁场设计、极距、氧化铝浓度以及槽温的不同,使电流效率易受到影响。若忽视对这些问题的有效控制,将造成铝电解电流效率过低,影响生产效益最大化目标的实现。本文将选择相应样品与试验方法,对铝电解电流效率的影响因素以及铝电解电流效率提升的方法进行探析。     

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.