Abel范畴的正合列与同态定理

证明了在Abel范畴中几个有趣的正合交换图命题,并应用其思想得到了Abel范畴的同态定理、短四引理和单满同态分解定理,统一了环模、BCK-代数、交换群层和粗糙模范畴的相关结果.     

铝锂合金在2000型战斗攻击机上的应用

1 应用背景1987年7月,美国国防部长向海军和空军部长发出了一分备忘录,需F/A-18和F-16型的派生型飞机,以加强空军特遣队(ATF),寻找海军A-12计划的替代机,同时要求九十年代后期投入使用。为此海军航空司令部(NAVAIR)成立一个领导工作组。首先由海军提出几种原型机,然后对候选机进行试飞对比。美海军认为:尽管F/A-18机体不是A-12的理想替代者,但该机具有全天候性能,又是目前可继续生产     

A-21S和201×7树脂吸附处理氰化提金废水研究

采用两步沉淀对某黄金冶炼厂含高铜、铁氰化提金废水进行降铜除铁预处理后,对滤液分别进行A-21S树脂和201×7树脂吸附对比试验。结果表明,A-21S树脂对废水中各离子的吸附率均高于201×7树脂,对金和锌络合离子的吸附率高达96%以上。A-21S树脂吸附过程中,Au(CN)2-对CNT-、Cu(CN)32-和Zn(CN)42-的分离系数SA/B平均值分别为56.69、25和0.051,选择性系数KA/B平均值分别为56.69、487.63和1.015。A-21S树脂吸附Au(CN)2-的选择性比CNT-和Cu(CN)32-强,而吸附Au(CN)2-和Zn(CN)42-的亲和力接近。体系中Zn(CN)42-的存在对A-21S吸附Au(CN)2-有竞争。     

贵金属网络管理系统的防窃密信息安全加密技术

在贵金属网络管理系统安全设计中,需要进行信息防窃密加密设计,通过加密算法优化,提高信息管理和传输的安全性。提出一种混沌同态映射分块编码密钥设计的贵金属网络管理系统信息安全加密算法。首先进行了贵金属网络管理系统传输信息的算术编码设计,采用混沌同态映射方法对编码的码元进行防窃密密钥设计,以此实现数据安全加密。仿真结果表明,该加密算法具有较好的防破译能力,提高数据安全性。     

A-3新型起泡剂在某铜矿山浮选应用研究

针对辽宁某铜矿山的矿石性质,用A-3新型起泡剂、MIBC和原生产工艺使用的GF油进行对比试验,结果表明A-3新型起泡剂对比MIBC和GF油具有泡沫层厚,精矿品位高和单位药剂成本低等优点。     

碱液回收锅炉用TP304L/Gr.A-1冶金复合无缝钢管的开发

通过对碱液回收锅炉用TP304LGr.A-1冶金复合管的材料优化、离心浇铸、热挤压、热处理及冷轧工艺进行试验和工艺研究,掌握了TP304LGr.A-1冶金复合管工业生产的基本工艺参数,为该类复合无缝管材的国产化提供了数据支持和工业化量产依据。     

俄勒冈冶金公司赢得向大型客机售钛的合同

俄勒冈冶金公司(Oremet)已签署了一项向法国宇航飞机供应钛的长期合同。其钛将用于法国的大型客机A-320、A-340和ATR42/72飞行器的吊架组件结构。     

A-200起泡剂选钼试验研究

通过粗选段小型试验，研究了A-200起泡剂选钼效果，试验结果表明：A-200起泡能力强，起泡速度快，泡沫脆散性好，药剂用量小，可代替现用起泡剂用于选钼，并可降低选矿药剂消耗及成本。     

A-2号保护渣的研制及其使用效果

A-2号保护渣的使用效果良好,它使钢锭表面光滑,在吸附杂质能力方面与英国福塞克保护渣相当。通过大生产统计,可清楚看出 A-2号保护渣在扁锭上使用的效果非常明显,与柳毛渣相比,轧后废品率可降低1.38%。     

用于重型机械轴承的新型锌合金

<正> 重型机械轴承的传统材料一般选用青铜。市场上也有少量的钢、铝、甚至塑料轴承。现在加拿大科明科公司开发了一系列高质量的新型锌铝轴承合金。 已证明属于锌铝合金之列的2A-12(12％Al)和2A-27(27％Al)具有良好的耐磨性能,可用于     

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.