新钢包热状态对钢水温度的影响

 以210t未加绝热层的无碳新钢包为研究对象,建立数值模拟模型进行计算,并利用实际生产数据进行验证。计算结果显示新钢包蓄热到第10周期达到热饱和状态;新钢包阶段由于蓄热所造成的钢水最大温降为183℃,据此建立了新钢包阶段的钢水温度补偿模型。实际应用结果表明,该温度补偿模型的应用提高了中间包的钢水温度命中率,对炼钢厂的生产具有一定指导意义。     

氩站钢包智能吹氩技术生产探索

钢包底吹氩是炼钢生产中常规的钢包搅拌方式,提供钢水成分温度均匀、夹杂物上浮等冶金功能所需的动能.研究表明,通过建立吹氩模型和钢包钢水裸露面积大小的视频监控,可以满足钢水夹杂物控制对钢水吹氩搅拌的要求,有助于高效化、智能化钢包吹氩技术应用.     

VD真空精炼温度预报模型

开发了较为完善的VD终点温度在线预报系统。采用MINITAB软件确定影响VD过程温降的主要因素为抽真空时间、保压时间、吹氩时间、非真空时间、VD搬入钢水的过热度、LF处理时间以及转炉出钢至VD初始测温之间的钢包运输时间。应用神经网络方法对VD处理终点的钢水温度进行在线预报,系统在线连续预报了95罐,预报温度与实际测量温...     

吹氩站多功能精炼技术的开发

武钢二炼钢吹氩站改造后,钢水吹氩精炼更能满足生产需要.经过一年多的开发,吹氩站具有以下多种功能:钢包CAS吹氩、微调钢水中Si、Mn、Ti、Nb、微调钢水温度、喂铝线微调Als、喂炭线微调C、真空钢水调温取样、出钢前透气砖试吹氩气提高钢包底吹氩成功率,大大节约了生产成本缩减了工序时间.     

涟钢LF精炼温度变化研究

采用多元回归分析方法建立了涟钢210转炉厂LF钢包炉精炼终点钢水温度的变化模型,应用该模型对LF精炼终点钢水温度进行预测,对预测结果进行了统计分析,结果表明该模型对LF钢包炉精炼终点温度的预测误差较小,能对现场产生指导意义。     

ANS-OB精炼终点温度预报模型

分析了ANS—OB精炼终点钢液温度的影响因素,包括吹氧、吹氩、合金添加情况和钢包状况等。基于理论分析和现场经验数据,建立了ANS—OB精炼终点温度预报模型。对于66炉次的实际生产数据,采用所建立的数学模型计算精炼终点温度,计算偏差在±5℃以内的精度达到80％,±7℃以内精度达到96％,±10℃以内精度达到100％。     

LF钢包炉精炼终点钢水温度的预报模型

采用多元回归分析方法建立了宝钢一炼钢厂LF钢包炉精炼终点钢水温度的预报模型，应用该模型对LF精炼终点钢水温度进行预测，对预测结果进行了统计分析，结果表示该模型对LF钢包炉精炼终点温度的预测误差在＋10℃时的命中率达到95％。     

关于小方坯连铸钢水吹氩后温度损失的分析

本文对首钢第二炼钢厂八流方坯同生产数据的统计分析，讨论了钢水吹氩结束温度、 氩至开浇镇静时间、浇注流数、钢包使用次数以及吹氩站废钢加入量对吹氩后钢水温度损失的影响，提出了防止低温钢的吹氩温度控制方法。     

吹氩站多功能精炼技术开发

二炼钢厂吹氩站改造后。钢水吹氩精炼更加能够满足实际生产需要。经过1年多的开发，吹氩站具有以下多种功能：钢包CAS吹氩、微调钢水中[Si]、[Mn]、[Ti]、[Nb]、微调钢水温度、喂铝线微调[Als]、喂碳线微调[C]、出钢前试气提高钢包底吹氩成功率，节约了生产成本缩减工序时间。     

马钢CSP流程RH精炼钢水温度预测模型

基于冶金机理和传热学计算,分析研究了RH精炼过程中脱碳、吹氧加铝、脱氧、合金化、喷粉、真空室状态以及钢包等级等各类因素对钢水温度的影响。结合现场实际生产数据,建立了RH精炼钢水温度预测模型,经过对实际生产跟踪验证表明,模型预测的钢水终点温度与实测值偏差在±5 ℃以内的命中率为87.42%,偏差在±8 ℃以内的命中率为100%。     

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.