热轧带钢宽度精度的控制

对实际生产中影响热轧带钢宽度精度的因素进行分析,包括轧线停轧时间、板坯宽度、轧制计划的编排、短行程控制的优化等。根据实践经验和分析,给出了提高热轧带钢宽度控制精度进而提高成材率的解决方案。     

CSP热轧带钢尾部轧破事故的分析与控制

通过iba曲线分析,结合现场生产实际,对热轧带钢尾部跑偏和轧破的原因进行了具体分析,并从热轧生产自动化的三级、二级、一级、零级优化及操作、维护等方面提出了相应的预防和减少带钢尾部轧破的控制方法。生产实践结果表明,上述控制方法可有效减少带钢尾部轧破事故,降低带钢废钢和连铸断浇的次数,确保精轧过程轧制稳定性。     

热轧带钢短行程控制优化的研究与实践

  短行程控制是热轧粗轧调宽过程中改善带钢端部形状、减少成材率损失的主要方法,而宝钢某热轧机组采用的传统的折线式短行程控制效果较差。采用刚塑性有限元法建立了立轧/平轧三维热应力耦合有限元模型,对粗轧机组轧制过程进行了全过程模拟,模拟结果得到实物验证。根据有限元模拟得到的带钢头尾失宽曲线,运用多项式插值原理,建立了短行程多项式模型,实际使用后提高了轧线成材率。     

宝钢2050mm热连轧低温轧制技术应用简析

简要分析了带钢热轧过程中的有关温度条件,介绍了宝钢２０５０ｍｍ热连轧机通过工艺与设备的改进,降低轧线温降,从而降低板坯出炉温度,以及适当降低粗轧出口温度与精轧终轧温度对热轧带钢表面质量的影响。这种低温轧制技术取得了节能、提高成材率、降低生产成本、提高产品质量的良好效果。     

低温加热工艺对热轧普碳钢生产影响度的分析

武钢针对某热轧生产线普碳钢轧线成材率仅为96.5%,远低于国内同等热轧生产线98.3%控制水平的状况,现场根据氧化烧损规律,对亚共析钢SPHC采用低温加热工艺,通过降低二加、均热段温度40℃,使成材率提高1.03%,成品屈服强度、抗拉强度、屈强比、伸长率满足交货要求。采用低温加热工艺后,精轧机组轧制力明显增大,但在轧机轧制力承受范围内。将低温加热工艺推广应用于普碳钢的生产上,在节能降耗、减少金属烧损、提高带钢成材率方面取得了明显的经济效益。     

热卷箱技术在承钢热轧带钢生产中的应用

在热轧带钢生产中，热卷箱技术可以通过减少轧线长度和减少功率消耗来降低生产成本。     

热轧导卫和过渡装置存在的问题及改进

针对某热轧带钢厂设计的导卫和过渡装置无法满足某钢种生产要求的现象,通过对轧线导卫和过渡装置的观察和分析,从工艺生产的角度对轧线导卫和过渡装置的设备设计、工艺生产、自动控制方面进行大量摸索,不断改进设备并优化工艺参数,逐步改进卷形、避免轧制某钢种的废钢并改善带钢表面质量,在实际生产中已取得良好的应用效果。     

热轧带钢头部跑偏轧破原因分析及对策

热轧带钢头部跑偏轧破是精轧生产现场最多的工艺事故,引起带钢头部跑偏轧破的各种因素较多,相互间有叠加影响,多因素的轧破严重影响轧制稳定性。通过对热轧带钢头部跑偏轧破进行详细的原因分析,介绍了减少带钢头部跑偏轧破相应的控制方法及对策。     

热轧导卫和过渡装置存在的问题及改进

针对某热轧带钢厂设计的导卫和过渡装置无法满足某钢种生产要求的现象,通过对轧线导卫和过渡装置的观察和分析,从工艺生产的角度对轧线导卫和过渡装置的设备设计、工艺生产、自动控制方面进行了大量摸索,不断改进设各并优化工艺参数,逐步改进了卷形、避免了轧制某钢种的废钢并改善了带钢表面质量,在实践生产中取得了良好的应用效果。     

热卷箱在1780热轧带钢生产线的应用

在热轧带钢生产线中,热卷箱对提高带钢质量和成材率、降低能耗至关重要。介绍了承钢1780热轧带钢生产线中热卷箱的设备组成、工作方式和使用效果,针对生产中出现的工艺参数选择、液压设备和检测设备存在的故障问题,逐一找出原因,提出了相应的解决措施。     

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。     

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.     

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。     

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.