除烟技术专利

位于美国新泽西州的ＴＡＴ技术有限公司最近获得了一项关于在粉末冶金坯料脱润滑剂工艺中消除排放的有害气体技术的一项专利 ,其美国专利号为 6,2 4 1,5 15 ,这项技术的发明者为ＨａｒｂｈａｊａｎＳ .Ｎａｙａｒ博士 ,这种专利产品可安装在普通烧结炉或特殊设计的烧结炉上。粉末冶金制品在烧结前需要在 2 60℃～ 371℃的预热区脱除压坯中的润滑剂 ,在这个过程中压坯内有约 30 %～ 4 0 %的润滑剂可被脱除 ,这种专利产品可通过氧化性气体使在预热区中的润滑剂蒸气、甲烷、氨气等气体氧化 ,减少脱润滑剂过程中黑烟的排放、加速压坯脱润滑剂的…     

磨损分析技术在钢包回转台轴承上的应用

油液监测技术是通过分析设备在用润滑剂的理化性能指标和所携带的磨损颗粒的情况,来获得润滑剂的性能变化信息以及设备的磨损状态信息,从而评价设备状态和预报故障原因、类型和部位的技术。磨损分析技术通过定性和定量多种技术手段结合设备运行特性的来综合诊断,已经广泛应用于设备运行状态的监测。     

如何选择设备润滑的合宜润滑剂

通常,设备制造厂在其设备说明书中对其设备各部位的润滑用油均有规定,设备操作人员,只要按照说明书的要求选用油品即可。非标准制作设备,没有推荐用油品种及牌号,有些设备说明书没有规定用油油品。这时在自行选择润滑剂时,应根     

注射成形粘结剂的真空脱除和收集

金属注射成形毛坯中粘结剂的脱除方法多种多样,如热解法,化学法,机械法等。本文讨论热解真空脱粘法。金属注射成形最常用的粘结剂种类是热塑料类,它通常是石蜡和聚合物的混合物,此外还有少量如润滑剂、表面活化剂之类的添加剂。除无机物类以外,所有其他类型的粘结剂都能用热解法脱除。经验表明,真空脱粘是非常有效的。这是由于在     

减速机润滑脂应用的效果分析

润滑是设备使用维护工作中一项不容忽视的重要内容。是改善设备运行状况,延长设备使用寿命的重要途径。 近年来,人们为了提高齿轮的传动效率,减少齿轮间的相互磨损,延长齿轮的使用寿命,除了提高齿轮材质的性能和合理设计外,逐渐认识到齿轮润滑剂性能也是一个极为重要的方面。对齿轮润滑剂,人们已进行了大量的研究工作并发展了许多性能良好     

首钢水厂选矿厂球磨机实现全自动润滑

首钢水厂选矿厂引进全自动润滑技术 ,彻底解决了球磨机不良润滑的老大难问题 ,收到了节约润滑剂、降低设备磨损的双重效果。球磨机是黑色冶金矿山选矿生产处于咽喉部位的关键设备 ,一旦出故障就会影响全流程的生产 ,而且设备价格昂贵。首钢水厂选矿厂磁选二车间球磨机大小齿轮的润滑剂 ,一直采用减速机脂 ,每个作业班润滑２次 ,由人工操作完成。进行重负荷作业的球磨机的大小齿轮 ,得不到理想的润滑 ,甚至因润滑不足出现“干磨”现象 ,加剧设备磨损。为使设备得到充分润滑 ,不得不采取多加润滑剂的方法 ,平均每台球磨机每天消耗１５ｋｇ 润…     

锆合金热挤压用防护润滑剂的试制与性能

为满足锆合金热挤压时的润滑与防护需求,试制了一种锆合金热挤压用防护润滑剂,主要成分包括有机硅树脂、低软化点玻璃粉、氧化铝粉、二硫化钼、石墨粉、滑石粉、云母粉等。实验温度为700～800 ℃时,采用圆环压缩法测得涂覆有润滑剂的Zr-4合金摩擦因子为0.19～0.25,润滑效果良好。将有润滑剂防护的锆合金分别加热至700、800和900 ℃并保温1 h,未发生明显氧化,热防护性能良好。测定了有、无润滑剂条件下Zr-4合金和H13模具钢的界面接触温度随接触时间的变化曲线。当Zr-4合金和H13钢的初始界面温度分别约为700 ℃和350 ℃时,无润滑剂时Zr-4合金表面温度达到稳定的时间为7.7 s,界面换热系数由250 W·m?2·℃?1增大至2700 W·m?2·℃?1;有润滑剂时Zr-4合金表面温度达到稳定的时间延长至12 s,界面换热系数由131 W·m?2·℃?1增大至1900 W·m?2·℃?1。这表明该润滑剂具有较好的高温热障性能。      

润滑剂含量对钛粉高速压制性能的影响

采用高速冲击压机压制钛粉,研究润滑剂含量对压坯性能的影响.结果表明:加入适量的润滑剂可以提高钛粉成形时的质量能量密度,从而获得更高密度的压坯.当润滑剂加入量为0.3%(质量分数)时,钛粉成形的最大质量能量密度为0.192 KJ/g,压坯密度为4.38 g/cm3,相对密度为97.4%.此外,适量的润滑剂能提高钛粉压制过...     

热轧钢管芯棒的润滑

在现代钢管生产中,如连轧管机组和顶管机组,芯棒与毛管间的润滑是至关紧要的。如在顶管时,芯棒涂抹上理想的润滑剂,可以降低设备负荷,提高芯棒使用寿命,同时有利于毛管获得良好的内部表面,使毛管和芯棒之间容易松棒和脱棒。     

钢铁厂设备的摩擦和润滑技术

钢铁厂各种设备摩擦部位的润滑保养工作的好坏,直接关系到设备的作业率、生产率以及设备的使用寿命,这是一项十分重要的工作.1979年西德期刊《钢与铁》第3期刊登了一篇题为《钢铁厂设备的摩擦和润滑技术——要求,措施和结果》的文章.文中例举一个有10万个润滑点的中型钢厂,采用"自动润滑系统"的方法,只需一个技术员就可胜任全厂的润滑工作.并且介绍了润滑剂的运输、贮存及供应方法,阐述了润滑剂种类与数量的经济关系.     

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。     

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.     

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。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.