竖向钢筋电渣压力焊接缺陷及防治措施

随着建筑业的发展,高层钢筋混凝土结构日益增多,各种竖向钢筋连接技术不断出现.钢筋电渣压力焊好为其中一种.该技术具有质量可靠、工效高、成本低、环境适应性强等优点,在施工中具有广泛的使用空间.但其在施工中仍存在一些缺陷,对工程质量造成影响,现就施工中发现的一些缺陷及相应的防治措施简述如下.     

吊车梁焊接工艺方案与质量控制

在５０ｔ吊车梁组焊施工中，通过采用严格的焊接工艺，使吊车梁各项质量指标均符合要求。     

特殊条件下管线钢管自动环缝焊接性研究

根据海外管线钢管用户需求,针对典型规格X70M大口径UOE管线钢管,在不超过0.25 kJ/mm超低热输入以及焊丝高强匹配条件下进行熔化极气体保护自动环缝焊接。通过研究实际焊接过程中环焊接头冷裂纹敏感性、焊后环焊接头强化、硬化与脆化倾向,全面评价X70M管线钢管在这种具有加速失效特征的特殊焊接条件下的环缝焊接性。同时,将特殊条件下X70M管线钢管接头使用性能特征与现场施工正常主流焊接工艺条件下的接头性能指标进行比较,从而证实了X70M管线钢管良好的环缝焊接性,并指出了特殊条件下管线钢管自动环缝焊接性评价结果对现场施工焊接的重要指导意义。结果表明,即使在特殊苛刻焊接条件下,X70M管线钢管焊接性仍能满足现场施工焊接要求。     

三级钢筋电渣压力焊焊接品质的影响因素

分析了影响三级钢筋电渣压力焊焊接品质的因素,提出了在施工中防止措施和注意事项。     

1000m^3球形氧气储罐现场组焊技术

文章介绍了球形储罐的结构类型,详细分析了球形储罐焊接常见的质量缺陷,并描述了球形储罐现场组焊的施工工艺流程以及焊接操作要点,提供了详细的焊接参数,可作为同类产品的施工参考资料.     

江西省科技馆宇宙剧场单层球面网壳设计与施工

简要介绍了江西省科技馆宇宙剧场单层球面网壳的设计与施工过程,阐述了单层球面网壳结构的受力特点以及结合施工单位的吊装能力所采用的设计思路、施工方案和独特的施工工艺.     

管线钢WIC试验对UOE钢管现场施工环焊的指导

WIC试验是加拿大焊接协会20世纪80年代开发的一种用于评价管线钢材料抵抗焊接氢致裂纹能力的试验方法,其反映了管线钢材料的可焊性,尤其是制管后管线钢管现场施工环缝焊接性。因此可根据WIC试验的结果,制定UOE钢管现场施工环焊坡口设计与组对、环缝根焊方法选择与工艺制定、环焊后续处理等方面的指导原则,为相关用户提供技术支撑。     

氧化铝种分槽体横环缝自动化焊接的分析

通过对大型氧化铝种分槽主体建设施工现场的研究,分析了氧化铝种分槽体自动化焊接施工的特性,开发研制成功了罐体立缝高效气电立焊机和横环缝埋弧自动焊接操作机。通过几年来在三十几座氧化铝种分槽主体施工工程中的应用,其焊接技术先进,焊接效率高,焊接质量好,极大地减轻了工人的劳动强度,降低了综合成本,有广阔的前景。     

内燃式热风炉炉顶焊后热处理

对内燃式热风炉炉顶钢壳产生晶间应力腐蚀裂纹的原因及防止措施进行了系统的阐述，并结合实际工程介绍了焊后热处理的目的及相应的热处理工艺。本文可供热风炉炉壳设计、施工参考。     

大型化工容器的现场组焊

大型化工压力容器的现场组焊,以气化炉壳体为例,难点在于设备组装难度大,施工工序复杂,设备材料焊接性能特殊,焊接量大、质量要求高,热处理工艺及质量要求严格,工装设备和机具多等,因此,压力容器的到场验收、现场组装、焊接前预热、焊接、热处理、无损检测、水压试验等关键环节必须进行重点控制,以保证最终产品质量.现对气化炉主要组焊技术环节作介绍,以指导施工全过程.     

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.