焦炭反应性和反应后强度的关系及影响因素研究

为了预测焦炭在高炉中的反应行为,对莱钢大量的焦炭进行了检测及数据的分析,说明焦炭反应性与反应后强度之间有良好的负相关性;对焦炭冷态强度与热态性能之间进行了对比,建议企业在保证焦炭的冷态强度合格的同时更要关注焦炭的热态性能指标;对影响焦炭热性能指标的水分、熄焦方式及配煤结构等因素进行了试验研究,指出焦炭水分稳定在较低水平上可以提高焦炭的热性能;干法熄焦可以显著改善焦炭的热性能;验证了配煤结构及煤质性能对焦炭热性能有根本影响。     

影响6.25m捣固焦炉焦炭质量的因素

通过分析、试验、计算比较,结合6.25 m捣固焦炉的现状,分析了该焦炉焦炭质量的影响因素。以炼焦用的单种煤、配合煤的细度、加热制度、熄焦方式等为主要因素,研究了它们分别对焦炭冷态和热态性能的影响,对指导生产具有实际意义。     

焦炭M10指标的影响因素分析及改善措施

焦炭M10指标的影响因素有炉型、装煤堆比重、配煤结构、入炉煤细度、熄焦方式等。采用大型焦炉、增加装炉煤堆比重、适当提高入炉煤细度、采取干熄焦方式、高的炼焦终温及合理的配煤结构,有利于改善焦炭质量。济钢6#～9#焦炉采用降低干熄焦故障率、优化配煤结构等措施,焦炭M10指标由6.46%改善到5.99%。     

配合煤结焦特性与焦炭热态强度的关系

分析近年来昆钢新焦配合煤结焦特性指标变化对焦炭热态性能造成的影响，找到配合煤结焦特性指标与焦炭热态性能指标之间的关系，提出配合煤结焦特性值x、Y、G、b适宜的控制范围。     

结焦时间对冶金焦热态性能的影响

焦炭的质量主要取决于配合煤质量和炼焦操作。配合煤质量和炼焦加热温度对焦炭质量的影响已有详尽论述，但结焦时间对焦炭质量的影响还没有深入的研究。塔塔钢厂的实验表明．焖炉可提高焦炭的平均尺寸和焦炭结构的致密性。焦炭经重大的结构变化．使其各向同性结构减少．粗粒和细粒镶嵌结构的数量增加。孔径减小。随着结焦时间的延长，焦炭的热态性能。即焦炭反应性（CRI）和反应后强度（CSR），均得到提高。     

大同云岗弱黏结性煤配煤炼焦研究

在对大同云岗煤基础性质研究的基础上,基于现有配煤方案,通过添加云岗煤来替代部分瘦煤、1/3焦煤或气煤进行配煤炼焦,研究了煤的细度和配比等对焦炭冷、热态强度和反应性等的影响。结果表明：云岗煤细度增加,焦炭的冷热态强度均有增加;云岗煤替代气煤,焦炭冷态强度随着配比增加先升高后减小,但热态强度下降;替代1/3焦煤及瘦煤,焦炭冷热态强度均是随着配入量的增加而减小。在配煤时增加肥煤的配入量,配入≯3%的云岗煤可以保证焦炭的质量。多用云岗煤,将有利于降低焦炭硫分和灰分,扩大炼焦煤资源,降低配煤成本。     

提高焦炭质量的研究

介绍了焦炭质量变化对高炉操作的影响以及大高炉生产对焦炭质量的要求。通过完善煤质管理、改善焦炉炉温均匀性、重视焦炭的热性质、优化配煤结构、改善焦炭强度等途径,提高焦炭质量。提出在炼焦煤资源紧张的情况下,采取选择粉碎、煤干燥、煤水分控制、煤干燥风选压块、干法熄焦等配煤炼焦新技术,可以提高涟钢焦炭质量,满足大高炉生产需要。     

捣固焦炭性能与高炉指标关系的探究

长钢新区为降低自产捣固焦炭成本,调整配煤比例,焦炭冷态指标稳定、热态性能大幅下降,结果造成高炉燃料比大幅上升。后及时调整配煤路线,焦炭热态性能趋于好转,高炉逐步稳定,燃料比下降。     

155t/h干熄焦工艺对焦炭品质及生产的影响

在相同配煤比及焦炉加热制度的情况下,对干、湿法熄焦的焦炭主要品质指标进行了对比分析,结果表明:干熄焦有效地控制焦炭水分,提高焦炭的机械强度,改善焦炭的热强度,降低反应性,但是对单炉产量和大焦率有一定的影响。     

焦炭气孔结构对热性能指标的影响

通过40kg试验焦炉炼焦试验,研究了焦炭气孔结构对热性能指标的影响。结果表明,随着气孔率及焦炭平均气孔直径的增加,焦炭反应性增加,反应后强度下降,热性质恶化;随着焦炭平均气孔壁厚度的增加,焦炭反应性降低,反应后强度提高,热性质改善。配煤结构、炼焦条件、熄焦方式等是影响焦炭气孔结构的主要因素。     

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.