莫来石-碳化硅-堇青石复合材料的制备

以莫来石、堇青石、碳化硅、矾土为主要原料,铝酸钙水泥、硅微粉为结合系统,制备了莫来石-碳化硅-堇青石复合材料,并与莫来石-碳化硅材料进行了对比。试样自然干燥24h脱模后,再经110℃烘干24h,分别在空气气氛下于1000℃、1300℃和1500℃热处理3h,检测各温度热处理后试样的体积密度、常温抗折强度、常温耐压强度以及试样的热膨胀系数、常温耐磨性能和抗热震性能。结果表明,莫来石-碳化硅-堇青石材料的体积密度小于莫来石-碳化硅材料的体积密度;常温抗折强度和耐压强度小于莫来石-碳化硅材料的常温抗折强度和耐压强度,只有经过1500℃热处理后的常温抗折强度大于莫来石-碳化硅材料的常温抗折强度。在莫来石-碳化硅材料中添加堇青石会降低材料的常温耐磨性能。莫来石-碳化硅-堇青石材料试样的热膨胀系数小于莫来石-碳化硅材料试样的热膨胀系数,抗热震性优于莫来石-碳化硅材料。     

膨润土对焦宝石基浇注料性能的影响

以焦宝石为主要原料,铝酸钙水泥、硅微粉为结合系统,研究了膨润土对焦宝石基浇注料性能的影响。试样自然干燥24h脱模后,再经110℃烘干24h,分别于1000℃和1300℃热处理3h。检测不同热处理温度后试样的线变化率、体积密度、常温抗折强度、常温耐压强度以及试样的热膨胀系数和抗热震性能。结果表明:在焦宝石基浇注料中添加膨润土会减小材料的体积密度,增大材料的线收缩率。试样中添加膨润土后减小了试样的热膨胀系数,降低了试样的常温抗折强度和常温耐压强度。添加适量的膨润土可提高试样的抗热震性能。     

不同酸碱性SiO_2微粉在铝硅系不定形耐火材料中的应用

为了研究化学性质不同的SiO2微粉在铝硅系不定形耐火材料中的应用,以焦宝石为主要原料,铝酸钙水泥为结合系统,分别研究了不同酸碱性的SiO2微粉对铝硅系不定形耐火材料性能的影响。试样自然干燥24h脱模后,再经110℃烘干24h,分别于600℃、800℃、1000℃和1300℃热处理3h。检测各温度热处理后含有不同酸碱性SiO2微粉试样的线变化率、体积密度、常温抗折强度、常温耐压强度、常温耐磨性能、热膨胀系数和抗热震性能。结果表明,在力学性能方面,铝硅系不定形耐火材料中引入酸性SiO2微粉的试样比引入弱碱性SiO2微粉的试样具有更大的体积密度,更高的常温抗折强度、常温耐压强度和更好的常温耐磨性能。在热学性能方面,铝硅系不定形耐火材料中引入弱碱性SiO2微粉的试样比引入酸性SiO2微粉的试样具有更低的热膨胀系数和更优良的抗热震性能。     

热处理温度对莫来石-铝矾土-氮化硅复合材料性能的影响

以莫来石、铝矾土、氮化硅为主要原料,铝酸钙水泥、硅微粉为结合剂,研究了不同热处理温度对莫来石-铝矾土-氮化硅复合材料性能的影响。结果表明:随着热处理温度的提高,莫来石-铝矾土-氮化硅复合材料的热膨胀系数在1400℃时出现最小值2.59×10-6℃-1;体积密度随着热处理温度的提高呈现先减小后增大再减小的变化规律;线变化率随热处理温度的提高呈现收缩先增大后减小的变化规律;常温抗折强度随着热处理温度的提高先增大后减小;常温耐压强度随着热处理温度的提高而增大。     

两种氧化铝微粉对矾土基喷涂料性能的影响

通过对含氧化铝微粉材料热处理试验,研究了两种不同粒径的氧化铝微粉对铝矾土基喷涂料件能的影响.结果表明:粒度较小的氧化铝微粉能使体系在1 300℃时产生较多的莫来石相,从而导致试样线变化减小,但在1 500℃时,其相对优良的促烧结性能又使试样线变化变大.不同热处理温度下,粒度较小的氧化铝微粉能明显提高矾土基喷涂料的体积密度、常温抗折强度和耐压强度.     

红柱石的粒度对莫来石-刚玉材料性能的影响

初步探讨了不同粒度的红柱石对莫来石-刚玉复合材料的烧结性能和热膨胀性能的影响,并着重讨论了随着温度的变化,红柱石的粒度对莫来石-刚玉复合材料的体积效应的影响规律。得出:随着红柱石颗粒变大,试样的体积增大效应越明显,耐压强度则减小。加入红柱石粒度大于0 5mm的试样在高于1500℃煅烧后具有莫来石化"潜能"。     

溶胶结合快干浇注料的研制及其工业应用

研制了以致密刚玉和莫来石为骨料、白刚玉粉和矾土粉及α-Al2O3(≤0.043 mm)微粉为细粉、采用硅溶胶作结合剂的浇注料,该浇注料制成的试样分别于815℃×3 h、1 100℃×3 h和1 400℃×3 h进行加热后,检测相应试样常温抗折强度、耐压强度、体积密度、线变化率和抗热震性能。结果表明:硅溶胶结合浇注料经1 100℃×3 h处理后的抗折强度和耐压强度分别达到12.6 MPa和128.2 MPa;经1 100℃水冷热震性能测试达到100次以上,试样基本没有出现裂纹,经测试其耐压强度损失率仅为18.7%;与传统采用铝酸钙水泥作结合剂的耐火浇注料相比,该浇注料具有良好的体积稳定性、较好的中高温强度以及较快的凝胶性和烘烤性。     

SiO_2超微粉等外加剂对刚玉质可塑料性能的影响

以高铝矾土、刚玉为骨料,以氧化铝微粉、氧化铬为粉料,以磷酸盐为结合剂,研究了SiO_2超微粉、磷酸盐结合剂、蓝晶石对刚玉质可塑料常温及高温性能的影响。结果表明:(1)随着SiO_2超微粉加入量的增加,试样的保存期延长,烧后体积密度降低,试样经1 000℃及1 500℃热处理后的常温强度及1 500℃高温抗折强度随着SiO_2超微粉加入量的增加而降低;(2)将结合剂由磷酸盐A换为磷酸盐B,试样的保存期延长,1 000℃烧后常温耐压强度略有增加,1 500℃烧后的常温耐压强度略有降低,1 500℃高温抗折强度变化不大;(3)在材料内添加7%的蓝晶石,试样1 500℃热处理后的线收缩减小,1 500℃热处理后的常温强度及高温抗折强度有所降低;(4)在材料内添加SiO_2超微粉、蓝晶石对刚玉质可塑料抗矿热炉炉渣侵蚀性能影响不大。     

红柱石无碳浇注料研制及在摆动流槽上的应用

以矾土、红柱石为主要原料开发了无碳浇注料,并与Al_2O_3-Si C-C质浇注料进行了对比,发现经110~℃×24 h、1 000~℃×3 h和1 450~℃×3 h处理后的试样,无碳浇注料的抗折强度、耐压强度和高温抗折强度都明显高于同一条件下的Al2O3-Si C-C质浇注料;含红柱石的无碳浇注料的热震稳定性明显好于不含红柱石的无碳浇注料。红柱石无碳浇注料代替Al2O3-Si C-C质浇注料用于1080 m3高炉铁沟摆动流槽,使用寿命由25 d提高到40 d。     

氮化硅铁对无水炮泥性能影响的研究

根据无水炮泥的基本配合比,分别用不同比例的氮化硅铁替代其中的刚玉作基质料,在埋炭条件下经110℃×24 h,900℃×2 h处理,以及在通氮气条件下经1500℃×2 h煅烧后,分别检测和分析了试样的物理性能。结果显示,试样的烘干强度最大,中温强度最低,高温强度介于两者之间。随着氮化硅铁含量从4%递增到12%,试样经过1500℃高温处理后,其常温耐压强度和抗折强度均呈递增趋势,当氮化硅铁含量为10%时达到最大值,体积密度则呈下降趋势,同时试样的抗渣渗透性能和抗渣侵蚀性能得到了提高,试样的钻孔开口时间逐渐缩短。     

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.