预酸洗工艺对SUS430热轧卷酸洗能力及粗糙度的影响

运用模拟试验方法,对SUS430钢种经罩式退火后的热轧卷采用不同的预酸洗工艺,观察预酸洗的酸洗能力以及对材料表面粗糙度的影响。通过试验发现,电荷密度、电解质浓度对酸洗能力的影响是不明显的,工艺速度与预酸洗介质对酸洗能力的影响是显著的;电荷密度、走带速度、电解质浓度与预酸洗介质对带钢表面粗糙度的影响都是不明显的。     

SUS430黄色脏污缺陷分析与工艺控制

采用电子显微镜与能谱分析对SUS430带钢表面的黄色脏污缺陷进行分析和研究,结果表明:SUS430冷轧带钢表面的黄色脏污缺陷主要是由于生产机组电解段除鳞能力不足,部分氧化铁皮残留在带钢表面造成。通过修订生产机组Na_2SO_4电解工艺参数、提高脱脂及刷洗能力等措施,SUS430冷轧带钢表面的黄色脏污缺陷得到了消除。     

干式抛丸与湿式抛丸对钢板除鳞表面的影响

利用自制组合式磨料浆射流除鳞设备进行Q235带钢抛丸除鳞效果研究。采用扫描电镜对干式抛丸和湿式抛丸除鳞后的钢板表面进行观察与分析,并进行能谱分析,采用IXRD残余应力测试仪对除鳞前后钢板表面的残余应力进行测量。比较两种抛丸方式氧化铁皮的去除效率和表面残余应力,并分析湿式抛丸除鳞抛射距离、时间和钢丸粒径对表面残余应力的影响。结果表明:湿式抛丸比干式抛丸除鳞后钢板表面氧含量更低,氧化铁皮除净率高,且表面残余压应力较低。湿式抛丸除鳞中随着抛射距离的减小、抛射时间和粒径的增加,钢板表面残余压应力值也增加。     

湿式抛丸处理板表面粗糙度的控制

目前,钢板涂装前的表面处理主要采用酸洗和干式抛丸,酸洗污染环境,酸洗板有过酸洗、欠酸洗等缺陷;干式抛丸粉尘大、除鳞效果差、效率低。介绍了一种湿式抛丸除鳞新工艺,能有效解决上述问题。处理后的钢板表面粗糙度对涂装质量有较大影响,作者研究了湿式抛丸工艺中钢砂粒度、钢板强度、处理时间、抛射速度等工艺参数对粗糙度的影响规律,并研究了除鳞后的钢板采用平整处理对粗糙度的影响规律,结果可用于指导湿式抛丸处理。     

430不锈钢热轧工艺研究及改进

通过对430不锈钢热轧卷表面粗糙度不均匀产生机理进行研究分析,对430不锈钢热轧工艺进行了试验改进,解决了热轧过程中轧辊黏结问题,消除了430表面粗糙度不均缺陷,提高了产品质量。     

BMD工艺大梁钢的涂装性能研究

随着环保要求的日益严苛,现有的酸洗工艺、干抛丸工艺已经越来越难以适应商用车主机厂对热轧汽车大梁钢的除鳞要求。为了明确BMD工艺除鳞后表面是否满足某主机厂用户的涂装要求,并综合对比多种除鳞工艺表面的涂装效果,研究了经不同工艺(BMD、酸洗、抛丸、未除鳞—空白)除鳞的B510L汽车大梁钢在各涂装环节后的性能表现。结果显示,BMD除鳞的B510L板材,其脱脂、表调磷化、电泳后的表面均能达到用户使用标准,并接近酸洗板标准要求,而干抛丸除鳞板和热轧板的耐盐雾腐蚀能力较差,无法满足用户要求。     

浅析抛丸工艺对不锈带钢表面质量的影响

分析了抛丸机不同转速和钢丸粒度等生产工艺对不锈带钢表面粗糙度的影响。通过总结实际生产经验,采用低叶轮转速的抛丸工艺,通过优化钢丸的加料方式,保证了抛丸机钢丸颗粒度的稳定,减少了钢丸粒度的波动,有效降低了不锈带钢表面的粗糙度,保证了不锈带钢表面抛丸处理的效果。     

SUS430不锈钢夹杂物的变化规律研究

对采用EAF-AOD-LF-CC工艺路线生产SUS430不锈钢炼钢过程夹杂物的成分组成和形貌、尺寸变化进行了分析,结果表明,SUS430不锈钢中主要形成呈球状或不规则球状分布的硅酸盐复合夹杂物,其变形能力较差。随着LF精炼和连铸过程的进行,SUS430不锈钢钢水中夹杂物的平均直径呈逐渐减小的趋势,铸坯夹杂物的平均直径为3.4μm左右,5μm以上的夹杂物占夹杂物总数的1%以下。变形能力较差的硅酸盐夹杂和镁铝尖晶石夹杂是引起SUS430不锈钢冷轧板表面线鳞缺陷的重要原因,采用钙处理和复合脱氧工艺,对改善SUS430不锈钢冷轧板的表面线鳞缺陷有利。     

平整机组延伸率对SUS430冷轧带钢力学性能的影响

研究了平整机组延伸率对SUS430冷轧带钢力学性能的影响。根据实际生产经验,优化平整工艺,对SUS430带钢采用在线平整后离线继续平整1~2道次的生产工艺,即累计平整延伸率为1.0%~1.6%,使带钢的延伸率达到29.4%,既消除了屈服平台,又得到了较为优良的力学性能和加工成型性。     

冷轧薄规格高强钢表面斜纹缺陷分析与控制

为了研究某2 230连续退火产线薄规格高强钢表面斜纹缺陷的产生机理,采用SIAS带钢表检系统和ZEISS扫描电镜对缺陷位置的形貌特征进行分析,并系统分析了表面粗糙度、平整机传动方式和平整轧制力对斜纹缺陷的影响规律。通过优化带钢平整工艺、匹配带钢运行速度、调整轧辊粗糙度等系列措施,解决了连退薄规格高强钢表面斜纹缺陷问题,取得了显著的应用效果。     

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。     

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。     

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.     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.