液压系统噪音产生的原因与降噪技术

本文通过对广钢双膛石灰窑液压系统在生产运行过程中的噪音和振动原因进行了分析，认为柱塞泵的噪音是液压系统噪音产生的主要原因，而柱塞泵出口的流量脉动和压力脉动则是造成次级噪音的原因。并提出解决问题的途径之一是采用具有P—Q控制降噪新技术的柱塞泵，认为这种柱塞泵能够更有效地减少柱塞泵泵体产生的噪音量以及柱塞泵出口流量脉动和压力脉动引起的次级噪音量。     

混流式水力机组防振分析

水轮发电机组在运行中的振动是一种普遍存在的不可能完全避免的现象,有设计、制造、安装、检修、运行等多方面的原因.但剧烈的振动可能导致水力机组结构破坏、降低运行效率和机组出力.异常振动一旦发生,小则产生噪音,大则危及安全,造成事故,给电厂带来巨大的损失.     

状态监测技术在精轧F2减速箱故障诊断中应用

针对鞍钢股份有限公司热轧厂1700生产线精轧F2减速箱振动幅值超标问题,利用先进振动分析仪CSI2130和SPM冲击脉冲采集器对精轧减速箱进行周期监测,应用状态监测与故障诊断技术进行分析,找出了导致减速箱振动超标的主要原因,制定预防措施,保障了设备稳定运行。     

状态监测技术在精轧F2减速箱故障诊断中应用

针对鞍钢股份有限公司热轧厂1700生产线精轧F2减速箱振动幅值超标问题,利用先进振动分析仪CSl2130和SPM冲击脉冲采集器对精轧减速箱进行周期监测,应用状态监测与故障诊断技术进行分析,找出了导致减速箱振动超标的主要原因,制定预防措施,保障了设备稳定运行。     

重力式热管换热器串联组件的实验研究

提出的新型重力式热管换热器的结构，是用以解决在余热回收系统中换热装置低温酸露点腐蚀问题。本技术的核心问题就是采用热管串联组件。这种组件可以使前后热管壁温分布均匀，提高在低温下抗酸腐蚀的能力。实验表明，即使人口烟气温度较低，烟气侧热管壁温仍然较高。     

状态监测与故障诊断技术在风机振动分析中的应用与探讨

风机振动是风机运行中最主要的故障之一。本文从风机振动的原因分析,现场风机振动故障解决实例等方面,阐述状态监测与故障诊断技术在实际生产中的重要性,通过状态监测提前发现问题,合理安排检修,避免设备事故的发生。     

透平空压机冷却器及管道的耐热防腐处理

１问题提出攀钢氧气厂１＃万立空压机，自安装投产以来，其轴瓦振动一直很高，虽经检修，但振动状况的改善不明显。对此，我们进行了认真分析，认为振动高的原因主要是转子组的动平衡不好，而动平衡的好坏，取决于原始动平衡和运行状态下的动平衡，而原始动平衡均在机组投入运行前进行了精确的校核。因此运行状况下的动平衡原因是我们研究课题。２原因分析经过对多次大、中、年修的设备情况进行分析，发现除一级入口管道外，其余各级空气出入口管道锈蚀严重，一、二、三级冷却器锈蚀尤甚。同时，转子叶轮上出现冲刷痕迹，叶片根部锈灰堆积严…     

减速箱轴承孔磨损的焊补修复

减速机箱体的材质大都是灰口铸铁,箱体轴承孔磨损是较常见的现象,而且是引起减速机运行中产生振动、噪音及齿轮过早损坏的主要原因之一。由于铸铁的可焊性极差,所以其焊补一直较为棘手。 去年发现一中间轧机减速机运行噪音和振动较大,今年初利用中修打开减速机后,发现带动8架轧机的箱体轴承孔已磨损出一个0.6mm深的槽(见图1)。决定用焊补法修复。由于现场修复无条件预热整个箱体,我们采用电弧焊冷焊方式。     

石墨热管换热器

由化工机械研究所研制的石墨热管换热器不仅可取代现有的块孔式、列管式换热器,而且由于其管壁温度和工作压力可调,使其应用面进一步扩宽,其主要应用领域有化工,工业锅炉和电站锅炉。 以不透性石墨材料制成的热管,即石墨热管综合了石墨材料和热管的优点,石墨     

奥氏体不锈钢TP347H高温服役后磁化机制

摘要：针对超临界机组奥氏体不锈钢（TP347H）管高温运行后管壁出现的磁化现象进行研究。通过显微组织观察、扫描电镜及能谱分析，对其磁性产生原因进行分析。试验结果表明：强磁性区域可分为基体区（Ⅰ区）、大块析出相区（Ⅱ区）及氧化层区（Ⅲ区），而弱磁性区域则仅存在基体区（Ⅰ区）与大块析出相区（Ⅱ区），大块析出相主要含Ni元素，氧化层则为主要富含Cr、Fe、Ni、O，长期高温运行后Ni的大量析出并形成大块析出相区是导致奥氏体不锈钢TP347H发生明显磁化的主要原因。     

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.     

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.     

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)