宝钢不锈钢AOD炉侧吹工艺优化

通过对AOD炉冶炼不锈钢冶金过程进行动力学分析和数学模拟,阐述了AOD炉脱碳保铬过程的基本特征。根据AOD炉脱碳保铬时的临界碳含量,调整了宝钢不锈钢AOD炉的侧吹工艺,结果表明,AOD炉氧气利用率和铬元素收得率均有较为显著的改善。     

AOD炉用耐火材料的使用研究

分析了太钢AOD炉的蚀损机理和历年来的使用情况,并与国外AOD炉用耐火材料进行对比,提出了提高AOD炉炉龄的措施。     

基于案例推理的AOD炉能耗诊断系统

采用基于案例诊断技术对AOD炉能耗进行诊断,以AOD炉物料平衡和能量平衡为基础,引入载能体的概念,建立AOD炉的能值模型,对铁水比、废钢比、AOD炉处理时间和两炉间隙时间对AOD炉能值的影响进行模拟,确定其对AOD炉能值影响的权重,结合层次分析法确定各个影响因素的权重,采用案例推理技术对AOD炉能值进行诊断。将AOD炉能耗诊断系统应用到某不锈钢公司AOD炉上,诊断AOD炉能耗上升的因素,为降低AOD炉能耗提供了决策依据。     

提高180t AOD炉炉龄工艺实践

通过AOD炉的冶炼特点,分析AOD炉的侵蚀机理。通过对炉衬材质合理选择及砌筑、冶炼工艺优化、生产组织改进等方面进行研究,在实践中不断改进,使180 t AOD炉炉龄得到稳步提高。     

氧化钼直接合金化冶炼316L不锈钢的理论分析及工业试验

 基于将氧化钼代替钼铁加入AOD炉中生产316L不锈钢的新思路,分析了AOD炉熔池中主要元素还原氧化钼的热力学和氧化钼还原机理并推导出其还原速率公式,讨论了AOD炉冶炼过程中氧化钼加入方式,介绍了将氧化钼置于AOD炉中冶炼316L不锈钢钢液的工业实践。结果表明：氧化钼在AOD中有很好的还原条件,在加入AOD炉后的半小时之内能够完全还原;氧化钼应该以复合球团（氧化钼、还原剂和抑制剂混合造球）的形式加入AOD炉中,保证冶炼正常进行的同时最大限度提高钼资源的利用效率。实际生产状况良好,达到了预期的效果。     

宝钢不锈钢AOD炉长寿技术

从炉壳型式、渣系组成、侧吹风枪选用等方面对宝钢AOD炉的长寿技术进步进行了介绍与分析,通过相关的研究与改进,宝钢AOD炉炉龄由投产初期的45炉/炉役提高至目前的185炉/炉役。     

AOD炉的高效化冶炼模型

 以往的AOD炉高效化冶炼研究往往通过提高供氧强度,优化转炉的炉容比,提高终点命中率等技术缩短冶炼周期,需要充分利用现有的设备,优化炉料结构和供氧制度,对生产工艺参数进行优化,充分利用这些物理热和化学热,实现AOD炉的高效化冶炼。开发了AOD炉高效化冶炼模型,在AOD炉物料平衡和能量平衡的基础上,结合AOD炉冶炼的工艺特征,建立AOD炉耗氧量和冶炼周期模型,分析了AOD炉冶炼周期随着铁水比和废钢比的变化趋势,得出冶炼周期最短时的炉料结构。结果表明：电炉不锈钢母液加铁水冶炼时,冶炼周期随着铁水比的增加而增加。电炉不锈钢母液加废钢冶炼时,冶炼周期随着废钢比的增加而增加。铁水加废钢冶炼时,冶炼周期随着废钢比的增加而延长。以硅铁为发热剂比以碳粉为发热剂冶炼周期短。     

宝钢AOD炉冶炼不锈钢顶枪吹炼工艺分析

针对宝钢不锈钢分公司侧顶复吹AOD炉在实际使用过程中表现出来的脱碳速度偏慢、钢水中铬元素氧化量偏大、吹炼过程升温偏慢的情况,以实验室模拟研究结果为基础,通过将其顶部单孔氧枪改为三孔氧枪的方法,对比分析了AOD炉单孔顶枪、11°三孔顶枪和15°三孔顶枪在脱碳速度、钢水中铬氧化情况以及升温速度3个方面的各自表现.结果表明,当AOD炉以电炉提供的高碳母液为主原料时,在枪位设定合理的条件下,11°三孔顶枪的使用有利于进一步提高AOD炉脱碳速度、降低AOD炉钢中铬氧化并加快熔池升温速度;单孔氧枪由于孔数不足,其在AOD炉中的不锈钢冶炼效果不佳;15°三孔顶枪由于孔间夹角设定不合理,与宝钢不锈钢分公司AOD炉侧吹复合使用时效果不佳.     

宝钢不锈钢AOD转炉炉龄突破150炉大关

今年以来,宝钢不锈钢分公司炼钢厂AOD转炉炉龄不断取得新突破。5月份达到140炉,6月份达到了150炉,7月份一举突破了150炉,达到了152炉,创下了不锈钢分公司AOD转炉投产以来的新高,使不锈钢分公司AOD转炉炉龄跻身国内同行业先进水平。     

AOD精炼不锈钢工艺发展

论述了国外AOD精炼不锈钢技术的发展。总结了太钢AOD精炼不锈钢在品种、质量、工艺研究方面的成果。对AOD炉材质进行了分析。     

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.