钡铁氧体磁粉的制备研究

钡铁氧体磁粉是适合高密度磁记录使用的性能优越的记录材料之一，随着磁记录密度的不断提高，磁粉的粒度成分为衡量磁粉性能的关键因素，为适应这一发展趋势，本文采用化学共沉淀方法，对制备条件，热处理工艺等进行了探索，研制了超细的（０．１５μｍ）磁性能较好的（σｓ＝５７ｅｍｕ／ｇ，Ｈｃ＝２５００Ｏｅ）钡铁氧体磁粉，并与国外同类样品作了比较。     

粒度分布对粘结铁氧体磁粉性能和压缩密度的影响

本文采用激光粒度分析仪检测了5种不同粒度分布的粘结磁粉,分析了粒度分布对粘结铁氧体磁性能及压缩密度(CD值)的影响,采用扫描电镜观察了磁粉颗粒形貌,分析了颗粒形貌对压缩密度的影响规律,研究发现双峰状的粒度分布曲线对提高磁份的压缩密度有显著效果。     

快淬NdFeB磁粉的组织与性能

研究了合金成分和工艺因素对产业化生产的快淬钕铁硼（NdFeB）磁粉组织与性能的影响．制备出标样性能为Br：0.67T，Hcb：435-438kA／m，Hej：812kA／m，（BH）max：74kJ／m^2的快淬NdFeB磁粉。     

不同粒度尖晶石对铝铬刚玉浇注料性能的影响

研究了尖晶石粒度对铝铬刚玉浇注料体积密度、显气孔率、抗折强度、耐压强度、热抗折强度、抗渣和抗热震性的影响。实验表明:(1)尖晶石粒度越细,试样烧后高温强度越高。(2)尖晶石粒度越细,热抗折强度越高。(3)尖晶石粒度越细,抗热震性先增加后降低,加入尖晶石200目,抗热震性能最好。(4)尖晶石粒度越细,抗渣性能增强,100目、200目、325目区别不大。     

磁粉及其偶联处理对压延取向橡胶粘结磁体性能的影响

通过对压延取向橡胶粘结磁体的磁性能及力学性能的测量和在扫描电镜上对磁粉颗粒形貌及粘结磁体拉伸断口形貌的观察研究，表明同样条件下，磁粉径厚比分布合理是保证粘结磁体性能的关键。磁粉大小均匀，径厚比大约在3．0～4．0之间时，磁体综合性能良好；偶联剂的种类及偶联处理工艺也对磁体性能有重要影响。     

制备工艺对Fe-Si-AL磁粉芯磁性能的影响分析

通过对Fe-Si-AL磁粉芯生产工艺过程进行实验研究,分析了制备工艺中影响Fe-Si-AL磁粉芯磁性能的几个主要工艺因素。研究分析结果表明,Fe-Si-AL磁粉芯的磁性能主要取决于粉末材料的制备方法、粉末粒度的分布、绝缘包覆、模压成型压力、热处理工艺及加固处理等因素。粉末粒度分布偏粗、绝缘介质含量越少、模压成型压力大、选用适当的热处理工艺参数及加固处理会使Fe-Si-AL磁粉芯得到最佳的磁性能。     

X-Ray荧光光谱仪分析烧结矿粒度效应试验研究

在X-Ray荧光光谱仪分析中，有关粒度效应对原料分析结果的影响，国内已进行了多年研究。实验表明，当颗粒本身的吸收减至很小时，可以消除某些矿物相的影响。如用不同矿物配置生料，有85％的生料通过200目（75μm）时，A、B两组铁矿石原料中SiO2的强度和浓度可自成线性关系，当粒度达到325目（44μm）时，两组铁矿石原料的实验点均落在同一曲线上。该试验说明：     

陕西宝鸡市海宝特种金属材料有限公司

本公司运用等离子枪旋转电极法以及滴注法生产球形金属粉末（微珠粉末）。由于旋转电极法和滴注法不受熔化坩埚及其它污染，生产的球形粉末均为高洁净度的球形金属粉末，粉末形状为完美的球形。旋转电极法生产的特点：球形粉末粒度容易控制，粉末粒度分布组距窄，容易满足用户的特殊品质要求。粒度可控制在-10目至＋325目之间。     

合成γ‘—Fe4N磁粉的关键因素

讨论了通过还原氮化法合成氮化铁磁粉过程中的几个重要影响因素，实验发现可以通过控制过量ＮａＯＨ浓度和Ｆｅ（ＯＨ）２浓度来控制α－ＦｅＯＯＨ粒子的粒度，从而来控制γ＇－Ｆｅ４Ｎ磁粉的粒度和磁性能。可以通过控制氢气与氨气比例来控制γ＇－Ｆｅ４Ｎ磁粉的百分含量。     

合成γ′-Fe_4N磁粉的关键因素

讨论了通过还原氮化法合成氮化铁磁粉过程中的几个重要影晌因素，实验发现可以通过控制过量ＮａＯＨ浓度和Ｆｅ（ＯＨ）２浓度来控制α－ＦｅＯＯＨ粒子的粒度，从而来控制γ′－Ｆｅ４Ｎ磁粉的粒度和磁性能。可以通过控制氢气与氨气比例来控制γ′－Ｆｅ４Ｎ磁粉的百分含量。     

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。     

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。     

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.     

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。     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.