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。     

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。     

斜齿增速箱齿轮问题对风机轴瓦振动的影响

风机增速箱齿轮更换后,导致风机轴瓦（与增速箱相连）垂直、轴向振动大。经过对该轴瓦振动的反复分析和处理,发现引起风机轴瓦振动的根本原因是更换的齿轮对问题,为类似风机、齿轮箱的检修和振动处理提供了依据。     

柔性转子振动分析及现场动平衡实践

风机在运行过程中,由于轴瓦磨损、叶轮腐蚀、对中等原因,易造成振动上升。本文针对某厂空气风机振动上升的情况,讨论了通过频谱分析法,找出振动升高原因,并进行了空气干燥系统的调整及风机转子现场动平衡校正,有效的降低了风机振动。     

故障诊断在烧结SJ9000风机中的应用实例分析

文中主要介绍了SJ9000风机振动增加时,利用故障诊断技术进行分析处理,通过振动波型和频谱分析,可以判定此次振动主要由风机转子不平衡引起的,采用增加动刚变和减小激振动2种方法来降低风机振幅.     

除尘风机异常振动的诊断与消除

文章对造成除尘风机异常振动的有关因素进行了分析。通过利用声振测试技术及分析技术、测温技术诊断除尘风机的异常振动。采取提高风机叶轮动平衡水平、风机联轴器较直水平消除异常振动。保证了除尘风机的稳定运行。     

离心风机的故障诊断及实例分析

对离心风机振动异常的原因进行了分析,并通过在风机工作转速时现场振动检测及故障诊断,综合分析轴承频谱图及风机实际振动现象,准确判断故障位置。     

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。     

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.     

风机故障机理及诊断方法

文章主要分析了风机振动机理及风机常见故障的诊断。运用时域分析、频谱分析和轴心轨迹分析等方法对风机振动进行分析,得出风机振动的原因是转子不平衡,风机转子不平衡故障分为转子质量偏心和转子部件缺损2种情况,其故障机理是相同的。对转子不平衡进行了受力分析,计算了转子不平衡量产生的力、力矩、力偶等,得出了转子平衡的条件。     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.