宣钢7号高炉超计划休风快速恢复实践

宣钢7高高炉受炼钢影响原计划休风36小时,实际休风时间被迫延长到90.5小时,由于组织到位,措施得力,炉况很快恢复到位。     

承钢高炉休风和复风关键技术的应用

对承钢不同高炉的多次休风和复风过程进行了跟踪,总结出休风和复风的关键技术,包括休风料数量的确定、休风料位置与分配、休风料的修正等。认为合理设计休风料数量和分配比例是复风后炉温平稳和炉况快速恢复的基础;堵部分风口复风,并掌控好各阶段的加风节奏,是炉况快速恢复的关键。承钢高炉采用休风和复风关键技术后,高炉炉温充沛稳定,恢复进程大幅加快,并杜绝了炉况失常事故的发生。     

莱钢2号750m^3高炉更换气密箱操作实践

莱钢2^#750m^3高炉布料溜槽因汽密箱机械故障，发生停转现象，必须进行汽密箱更换，为减少生产损失，借鉴1^#750m^3高炉处理类似事故的经验，本着安全、快速的原则，制定了合理的休风、复风计划，通过合理安排休风、复风送风风口数目及休、复风料，本次更换汽密箱从降料线休风到炉况恢复正常比计划提前了29小时，大大降低了检修损失。     

京唐1号高炉无计划休风后的炉况恢复

对京唐1号高炉无计划休风后的炉况恢复操作经验进行了总结。1号高炉在焦炭负荷最高达到5.93时,因外围设备事故造成高炉无计划休风7h和16.5 h,复风后炉况出现反复,多次悬料,被迫采取附加焦炭、缩小矿批、退焦炭负荷、停氧、调整装料、热洗炉等措施来恢复炉况。实践表明,特大型高炉在重焦炭负荷下非计划休风时,根据停风时间的长短,重视炉内热制度和冷却制度的平衡,加适量的循环焦来恢复炉况是比较有利的方法。     

首钢长钢6号高炉优化休复风操作生产实践

针对高炉长期休风后的炉况恢复进行了阶段性研究、分析,归纳了日常生产操作中影响炉况恢复的因素,总结出了长钢6号高炉在长期休风状态下,快速恢复炉况的具体操作经验。     

邯钢3200m3高炉无计划休风炉况快速恢复实践

邯钢3200m3高炉因设备故障无计划休风近84小时,复风后47小时炉况完全恢复正常。本文对此次无计划休风炉况的快速恢复实践进行总结,通过详细分析复风后各个操作参数的合理控制,为同类型高炉提供参考。     

舞钢1260m3高炉长休风恢复炉况总结

对舞钢1 260 m~3高炉长休风及炉况恢复过程进行了总结。对休风前炉况和休风料的加入、休风过程的控制及复风后炉况的恢复过程进行了分析概述,并对本次长休风过程存在的焦比添加量较少、锰矿配吃较多、风口堵砖原则性失误等因素对高炉恢复生产的不利影响进行了分析,为以后的长休风过程及炉况恢复积累了丰富的经验。     

济钢1号1750 m3高炉炉况失常的处理

对济钢1号1750m~3高炉炉况失常的处理进行了总结分析,认为气流分布失常及高炉休、慢风率高造成炉缸堆积是炉况失常的主要原因,指出了炉况恢复过程中存在的不足。     

莱钢1~#1880 m~3高炉灌渣后炉况恢复实践

针对莱钢型钢炼铁厂1~#1880 m~3高炉大面积停电造成的灌渣事故,描述了停电后的应急操作及休风过程,以及休风后的铁水保温措施、复风准备工作、停电前的炉况及其炉况恢复过程,对炉况恢复经验进行了总结。     

8号高炉焖炉实践

针对韶钢8号3 200 m~3高炉焖炉操作进行为期4 d的年修,通过稳定休风前炉况,优化休复风方案,调整气流,使炉况恢复正常。8号高炉焖炉的实践,有利于解决铁烧平衡的问题,使炉况进一步得到优化。     

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。     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

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。     

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。