热风炉助燃风机系统设备选型及设计

详细介绍了热风炉助燃风机系统设计,涉及不同条件下的助燃风机配置,以及根据风机性能曲线、风机出口风量、风机出口压力进行设备选型。此外,还介绍了根据实际工况对风机参数进行换算,应用变频技术提倡节能及采取降噪措施促进环保。     

风机振动原因分析及防治

对风机振动原因进行了综合分析 ,从设备、工艺和维护几方面分析了可能导致风机振动的因素 ,提出多种措施 ,改善了风机作业状况、工作环境 ,有效的解决了风机振动问题 ,延长了风机使用寿命。     

转炉煤气回收风机振动故障诊断与改进措施

结合转炉煤气回收风机几次异常振动进行综合诊断分析,从设备、工艺和维护几方面分析可能导致风机振动的因素,提出相应改进措施,以改善风机作业状况、工作环境,从而有效解决风机振动问题,保障风机的稳定运行.     

论收尘风机的节能

针对收尘风机富余量过大,风机结构存在不合理的状况,论述了以风机集流器、叶轮为改造重点,对风机进行的节能和提高效率的改造。     

风机不平衡研究

研究了风机不平衡的原因、特征和类型,给出了两种校正风机不平衡的有效方法,对正确的判断风机不平衡故障,确定风机不平衡的类型,消除风机不平衡引起的振动有着重要的现实意义。     

风机振动和轴承温度过高原因分析及对策

对风机振动、轴承温度过高原因进行了综合分析,从设备、工艺和维护几方面分析了可能导致风机振动和轴承温度过高的因素,提出多种措施。改善了风机作业状况、工作环境,有效的解决了风机振动和轴承温度过高问题,延长了风机使用寿命。     

烧结主抽风机转子结构优化设计

2004年底风机转子因振动超标多次停机检查处理。通过优化改进风机转子结构,消除了原风机的设备隐患。希望有助于同类型风机的设计、使用和维护,也为同类风机的结构优化提供了一定的借鉴意义。     

风机振动原因分析及处理方法探讨

文章从设备、工艺和维护等方面分析了可能导致风机振动的因素,提出多种防范措施,改善了风机作业状况,解决了风机振动问题,延长了风机使用寿命,保障了生产的安全运行。     

振动测试基础上的风机动平衡实例

利用便携式振动测试分析仪,测量烧结风机转子振动信号,通过频谱分析法分析风机转子不平衡故障特征,结合风机类旋转机械转子不平衡故障振动信号的时域、频域谱特征,进一步明确风机不平衡故障的时频特征,并通过现场动平衡方法以减小风机不平衡振动。     

6号高炉热风炉引风机振动的诊断与处理

<正>1问题的提出柳钢6号高炉热风炉引风机为Y4-75型离心风机,主要给煤气预热器提供动力源。风机配套电机为YKK450-3-6型电机。自2005年6号高炉引风机投入使用后,电机、风机运行平稳。机组要求风机各项振动值4.6 mm/s,电机各项振动值2.8 mm/s(GB50231-98)。随着使用年限增加,风机接手端、风机叶轮端轴向振动值也逐渐加大,且风机两轴承轴向振动值超     

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.