边界条件对椭球颗粒在超临界水中受力与传热特性影响的数值模拟

采用颗粒尺度直接数值模拟的方法进行超临界水中单个椭球颗粒强制对流模拟,在压强为23 MPa条件下,考虑了超临界水物性参数随温度变化特性,计算得到了不同工况下椭球颗粒在超临界水中的曳力系数和平均努赛尔数.在两种不同的边界条件下,即流化颗粒问题的固定墙边界和沉降颗粒问题的移动墙边界,比较和讨论了墙壁因子和颗粒纵横比对曳力系数和平均努赛尔数的影响.结果表明:曳力系数和平均努赛尔数随着墙壁因子和颗粒纵横比的增大而减小,与沉降颗粒相比,流化颗粒受墙壁因子的影响更大.超临界水中的曳力系数与平均努赛尔数和前人的经验公式计算值存在很大差距,因此提出了新的预测关联式.     

不同尺寸电工钢样品磁性能检测对比分析

对CSP流程生产的无取向电工钢M50W800不同尺寸样品的磁性能进行了测试和分析,结果表明:采用不同单片检测的磁性能结果与标准的Epstein方圈样品检测对比,存在明显的偏差;且同一尺寸的单片纵横向样品之间相比较,对应的磁性能差异性也较大。几种不同尺寸的单片样品,以320mm×30mm尺寸的纵横向平均值最接近标准Epstein方圈样的性能值,其铁损偏差最小。     

包铝合金圆棒出口美国

近年来，成州矿冶集团公司坚持科学发展观，通过科学决策和稳步实施产业升级，实现了跨越式发展。一是规模发生了变化，实现了跨区域、跨行业扩张；二是产业发生了变化；坚持以矿业生产为主线，实现纵横双向开发扩张，在铅锌产业方面，扩大了采、选矿规模，采矿扩大到了39万t／a，选矿能力提高到25万t/a，5万t锌冶炼一期工程和1万t铅综合加工厂及小厂坝日采1000t竖井工程全面建成投产并达产达标；     

一种新的空分启动方法——流路图法

本文提出了一种全新的空分启动操作方法,并概括出启动过程中两个最重要的原则,即最大制冷量原则和最小温差原则.     

硅锰合金取样方法对综合精密度影响的研究与评定

对硅锰合金取样方法进行了试验＼研究,确定了最小份样量、最小份样数,并对其方法的综合精密度进行了评定,确定了方法的准确、可靠。     

高炉铁口无水炮泥强度及其特性的分析试验

材料选用某钢厂高炉无水炮泥,通过模拟铁口试验装置,对此种无水炮泥在多梯度温度状态下焙烧后的强度及微观组织结构进行了分析,结果表明,试样在200℃×2h烘干后的耐压强度及抗折强度最大,800℃×2h煅烧后的耐压强度及抗折强度最小,在1100℃×2h煅烧后的显气孔率相比800℃×2h煅烧后的显气孔率明显较低;试样在1400℃时微观组织结构密实均匀稳定。     

高炉铁口无水炮泥强度及其特性分析

通过模拟高炉铁口生产条件的试验,对某大型高炉的无水炮泥在不同条件下焙烧后的强度及微观组织结构进行了分析。结果表明:试样经200℃×24 h烘干后,耐压强度和抗折强度最大;经800℃×2 h煅烧后,耐压强度和抗折强度最小;经1 100℃×2 h煅烧后,显气孔率相比800℃×2 h煅烧后的显气孔率明显较低;在1 400℃时,微观组织密实、均匀,性能稳定。     

三色拉姆塞数R3(C8)研究

用r种颜色对图G的所有边着色,记着第i色的边构成的子图为Gi,如果存在一种着色方法使得每一个Gi(1≤i≤r)都不包含图H,则称图G对于H可以r着色.拉姆塞数Rr(H)是使得完全图Kn对于H不可以r着色的最小正整数n.令Cm表示长度为m的圈,Dzido等证明了R3(C2k)≥4k.本文对k=4的情形进行研究,利用计算机,通过大量的计算证明了R3(C8)=16.     

布置·物流·能耗

阐述了在企业建设和生产期间，工厂布置在技术上和经济上所处的重要位置，并提出了工厂布置获得最佳物流和最小能耗折主要措施。在市场经济体制下，必须由传统的静态设计改为动态设计，并阐明可以获得的效益。     

螺旋管内传热过程的不可逆损失分析

以水为工作介质,给出了表征不可逆损失的无因次熵产数Ns的计算式;并应用最小熵产原理分析了各种参数对不可逆损失的影响.结果表明:层流状态下存在一个最佳Re数使Ns 值最小,影响不可逆损失和最佳Re 数的主要因素是无因次入口温差r、定义的无因次数U2及半径比S.这对确定螺旋管合理的流动工况、结构参数和减小传热过程中的不可逆损失有重要意义.     

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.