武钢常用含铁原料特性及配矿实践

从化学成分、粒度组成、成球性能和烧结性能等方面研究了武钢常用含铁原料的烧结特性。结果表明:非粉和纽粉烧结性能较好,巴粉、委粉和MAC粉烧结性能中等,精矿、FMG和加粉烧结性能较差。在此基础上提出了优化配矿方案,从而改善了混匀矿的烧结性能,促进了烧结经济技术指标的改善。2011年1~4月烧结台时产量达到440.22 t/(台·h),转鼓指数达到79.8%,分别较上年同期提高了30.8t/(台·h)和0.59%。     

烧结含铁原料性质的研究

武钢烧结所用含铁原料,来源广泛,品种复杂,其理化性能和烧结性能不一,对烧结有着不同影响。本课题较全面地研究了各种含铁原料的物理、化学性能及烧结性能,为合理选用烧结含铁原料及组织生产提供参考。     

唐钢烧结原料冶金性能的对比研究

对唐钢烧结用含铁原料的物理化学性能、烧结性能和相应烧结矿的冶金性能进行了系统研究,为进一步对烧结用矿种的合理选择和搭配提供了依据。     

烧结工艺对钛合金汽车零件性能的影响

采用不同的烧结温度和烧结压力对Ti-6Al-4V-0.5In钛合金汽车零件试样进行放电等离子烧结处理,研究了烧结工艺对试样耐磨损性能和冲击性能的影响。结果表明:随烧结温度的提高和烧结压力的增大,试样的耐磨损性能和冲击性能均先提高后下降。钛合金汽车零件材料的烧结温度优选为875℃,烧结压力优选为45 MPa。     

高品位镜铁矿烧结性能试验研究

为了探索烧结生产配加高品位镜铁矿的可行性,对该矿进行了矿物相和理化性能分析,并研究了其烧结性能和烧结矿的冶金性能,确定了该矿在唐钢烧结生产中的适宜配比.     

氮基气氛中材料的脱硫与氮吸收

介绍了烧结铁基零件的硫损量和硬度、尺寸变化等与氮基烧结气氛成分、压坯含硫量等因素的关系,并比较了以硫或者MnS作为添加剂对增脱硫量及烧结件性能的影响,还介绍了烧结气氛中氮含量对烧结Fe-C材料的物理性能、烧结铁材料的磁性能和烧结不锈钢材料的耐腐蚀性能的影响,以及不锈钢烧结材和冶炼钢锻材在氮吸收上的重要差别。     

低压烧结对硬质合金组织和性能的影响

通过配制不同粒度的WC粉末,分别在低压和真空条件下烧结制备WC-6Co硬质合金,采用扫描电镜分析、光学金相检测、显微硬度试验、钴磁检测、矫顽磁力检测和抗弯强度检测等方法,对比研究了低压烧结和真空烧结制备的硬质合金的显微组织和性能。结果表明,与真空烧结相比,低压烧结有效地降低了合金的孔隙度,增大了合金的密度,提高了合金的综合性能;低压烧结对合金的组织和性能的影响程度与原料WC粒度有关,低压烧结对粗颗粒WC为原料的合金的综合性能提高不明显。     

镜铁矿烧结性能试验研究

镜铁矿因成球性和可烧性较差,使得该矿在烧结料中的应用受到了极大限制。本文通过试验对镜铁矿制粒性能、烧结特性及冶金性能的研究,采取优化原料结构技术措施,探索出镜铁矿在烧结中合理使用新途径,为提高其在生产中的配比和改善烧结性能提供指导。     

氮气保护下铝基烧结含油轴承烧结工艺优化研究

通过粉末冶金技术制备质量分数为7.5%的含铜铝基烧结含油轴承试样,研究了在氮气保护下不同烧结温度以及烧结时间对试样的微观结构和综合性能的影响,优化得到最佳烧结工艺。研究结果表明,当烧结温度超过537℃时,烧结试样发生局部熔化,液相开始生成;随着烧结温度升高和烧结时间的延长,烧结试样的尺寸收缩率以及压溃强度不断提高而含油率不断减小。当烧结温度为560℃、烧结时间为120 min时,烧结试样拥有良好的综合性能,压溃强度和含油率分别为151.3 MPa和16.7%,呈最佳烧结状态。     

烧结高速钢的研究和发展动向

介绍了水雾化－直接烧结粉末高速钢的研究和动向。介绍了提高其烧结性能的方法,包括使用烧结性能的方法,包括使用烧结添加剂、采用氮基烧结气氛、利用计算机预测平衡相图研究新的合金成分等。此外,还介绍了提高材料硬度、强度和断裂韧度的研究以及添加碳化物、氧化物和氮化物对材料性能的影响。     

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.