直径300 mm电渣重熔钢锭的补缩工艺

１快锻机开坯对Φ３００ｍｍ钢锭补缩端的要求河北冶金实验厂采用双极串联电渣炉生产Φ３００ｍｍ电渣锭,供快锻机开坯,精锻机成材,其补缩端要求为：（１）补缩端头不得有渣沟,锻压钢锭时,渣沟处应力集中,易开裂。（２）补缩端不得有大台阶,台阶过大增大切头量。（...     

电渣锭锭型和充填比对H13模具钢质量的影响

冶钢公司采用电炉冶炼＋电渣重熔工艺冶炼高质量Ｈ１３模具钢,为了研究电渣工艺参数变化对钢材质量的影响,本文讨论电渣锭型和充填比对钢材总体质量的影响。１　实验过程１．１　实验用料电炉３ｔ钢锭,轧成３２０ｍｍ和２５０ｍｍ方坯,重熔２．５ｔ电渣锭;电炉冶炼浇铸１８０ｍｍ方坯、３２０ｍｍ圆坯重熔１．２ｔ电渣锭。４种母材经重熔后加工成Φ１８５ｍｍ材。试样分别从Φ１８５ｍｍ电渣材和Φ１８０ｍｍ电炉钢材上切取。试样编号和冶炼工艺见表１,试样的化学成份见表２。表１　实验用料的冶炼工艺Ｔａｂｌｅ１　Ｓｔｅｅｌｍａｋ…     

金属陶鉴表面复合钢锭模制备与应用的研究

本文采用表面浸渗复合技术制备金属陶瓷表面复合钢锭模，并对复合钢锭模的制备，使用寿命，所生产的钢锭质量，失效方式，复合层的组织形态等进行研究。结果表明，本方法可在钢锭模内表面获得２～５ｍｍ厚的金属陶瓷复合层，并可明显提高钢锭模的使用寿命和钢锭表面质量。     

上海浦东钢铁公司的紧凑式轧机

上海浦东钢铁公司型钢厂,为解决连铸坯一火成材,于１９９７年１１月投产了Φ５５０ｍｍ５机架紧凑式粗轧机组。型钢厂三车间原有加热炉１座及三列横列式（Φ４００ｍｍ×２、Φ４００ｍｍ×２、Φ２６０ｍｍ×３＋Φ３３０ｍｍ×３）小型轧机,后面有步进齿条式冷床及收...     

提高钢锭模使用寿命的优化设计

在文献〔１〕所论述的基础上，以某钢铁公司的５．６ｔ钢锭模为例，采用热光弹法与有限元法对钢锭模模口截面进行热应力与变形分析，针对钢锭模截面形状进行优化设计，提出合理的钢锭模截面形状与尺寸，为提高钢锭模的使用寿命提供可靠依据。     

改进钢锭断面开头提高厚板成材率的变形实验

简述钢锭断面开头对厚板成材率的作用。着重阐述模拟舞阳４２００ｍｍ厚板轧机的轧制工艺条件，轧制８．０ｔ镇静扁锭，采用正交设计法确定钢锭断面最佳尺寸。得到了在确定轧制工艺条件下，正确确定最佳钢锭断面尺寸的正交回归数学模型。在本实验最佳断面形状的锭型与合适的工艺相匹配下，厚板成材率约提高５．２７６％，国裎切损率约降低３．６３５％。     

方坯连铸低碳普钢结晶器保护渣的研制

在实验室研究的基础上，对保护渣各种原材料进行选择，研制出了断面为２００ｍｍ×２００ｍｍ，拉速为０．８～１．２ｍ／ｍｉｎ方坯连铸颗粒保护渣。该保护渣性能良好，使得连铸方坯合格率达到了９９．６％。     

改进钢锭断面形状提高厚板成材率的变形实验

简述了钢锭断面形状对厚板成材率的作用。着重阐述模拟舞阳钢铁公司４２００ｍｍ厚板轧机的轧制工艺条件，轧制８．０ｔ镇静钢扁锭，采用正交设计法确定钢锭断面最佳尺寸。得到了在确定轧制工艺条件下，正确确定最佳钢锭断面尺寸的正交回归数学模型。在本实验最佳断面形状的锭型与合适的工艺相匹配下，厚板成材率约提高５．２７６％，边部切损率约降低３．６３５％。     

GH738合金大截面钢锭偏析问题研究

为石化工业节能装置ＹＬⅡ－１００００型烟机所提供的大直径ＧＨ７３８合金烟气机盘，采用直径５０８ｍｍ在尺寸钢锭生产。主要研究铸锭的偏析情况，为减少偏析进行的均匀化处理工艺试验的内容与结果，并对铸锭偏析程度与盘件组织均匀性关系进行分析。从而为盘件生产过程中钢锭均匀化处理工艺提供了依据。     

炼钢

宝钢超薄型热轧板进入试产阶段上海宝钢（集团）公司１５８０热轧厂去年底轧制成功１．４ｍｍ、１．３ｍｍ、１．２ｍｍ超薄型热轧板后，现已进入试生产阶段。１．４ｍｍ、１．３ｍｍ、１．２ｍｍ超薄型板，原属于宝钢冷轧厂生产冷轧板规格范围，现在通过１５８０热轧厂直...     

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.