Ir-Ta氧化物涂层阳极在硫酸盐电解溶液中的电化学行为

采用测量极化曲线等电化学方法研究了钛基Ir-Ta氧化物涂层阳极在酸性硫酸盐溶液中的电化学行为。结果表明:酸性硫酸盐溶液中Ir-Ta氧化物涂层阳极上的析氧反应发生电化学极化,但超电势远低于Pb阳极和Pb-Ag阳极而电催化活性好,可以显著降低电解能耗。溶液pH和电解温度升高,Ir-Ta氧化物涂层阳极上析氧反应的超电势降低;溶液中含有不同金属离子时析氧反应的超电势略有不同,但金属离子浓度不影响其超电势。Ir-Ta氧化物涂层阳极在1 mol/L H2SO4溶液和电流密度40000A/m2的条件下的强化寿命可达55天。     

钛阳极经济效益及涂层工艺分析

钛阳极具有耐腐蚀、极距变化小、槽电压低、使用寿命长等突出优点而取代石墨阳极投入了工业化生产,使氯碱工业发生了很大的变化.在钛阳极网上涂以金属涂层,不仅提高了导电性能,而且提高了钛阳极的耐钝化性和寿命.其中涂钌钛阳极被广泛采用,因为它具有如下突出优点:     

湿法冶炼中电沉积钴用钛阳极研究

钴的冶炼基本采用湿法冶炼技术, 电沉积钴是湿法冶炼提取钴的重要部分. 研究了电沉积钴用不溶性阳极, 说明了阳极的制备方法, 测试并分析了阳极的强化寿命, 表面形貌及析氧析氯极化曲线, 同时対电极的失效机制进行了分析. 结果表明:添加含铱中间层既保证了钛阳极催化活性, 降低了能耗, 提高了电流效率, 又延长了钛阳极使用寿命. 槽压由以前的3.1 V降到2.5 V, 电流密度由250 A·m~(-2)提高到350 A·m~(-2), 在实际应用中钛阳极使用寿命达到两年.     

金属阳极钌钛涂层的研究

涂层是金属阳极制造的关键工艺,涂层的性能将直接影响阳极的使用寿命和质量。本文结合氯碱工业用涂钌钛阳极的生产实际,对提高涂层性能的途径进行了探讨。     

涂层钛阳极的研制及在电解锌中的应用

针对烟道灰电解锌这种既析氯又析氧的介质环境,综合析氯型和析氧型涂层钛阳极的优点,研制出适合于在这种介质环境中使用的RuIrTaTi涂层钛阳极,测试了阳极腐蚀机理及使用性能。该涂层钛阳极在山西太古电锌厂挂片使用1a,在节能和提高锌产率方面都有明显效果,相对于铅阳极,使用成本有大幅降低。     

钛制阳极板的焊接变形及控制

钛阳极板是宝鸡有色金属加工厂承接的新疆天山化工厂电解槽的阳极部分.其基本结构是由基板和阳极片组成.并且基板上焊有两块10mm厚的钛板条,以提高基板的刚性.阳极片成排地被焊到基板上,且阳极     

钛基形稳阳极的制备方法及其应用

介绍了新型阳极——钛基形稳阳极（DSA）的制备方法及其应用，并对其发展进行了展望。指出在各种金属基DSA中，钛基DSA应用最广，因其具备使用寿命长、电化学催化性能好、无二次污染等特点，在相关工业生产中具有节约能源消耗、减轻污染、降低成本及有效治理工业废水的实用效果，符合清洁生产的要求，可产生巨大的经济效益和社会效益。     

析氧型贵金属涂层钛阳极的研究进展

贵金属涂层钛阳极是近年来发展起来的具有广阔应用前景的新型阳极,尤其在以有色金属电解为代表的电化学体系中,展示出巨大的发展潜力.文章综述了国内外析氧环境中贵金属涂层钛阳极的研究和开发方面的重要工作和进展,其中重点阐述了IrO2-Ta2O5涂层不同方法的改性研究.评述了各制备方法的优势和不足.同时,简单介绍了贵金属涂层钛阳...     

NaCl-KCl熔盐中TiB2阳极溶解和电化学还原行为研究

金属钛清洁提取是近年来的研究热点.提出了以TiB2为可溶性阳极,电解提取金属钛新方法.利用线性扫描、循环伏安和方波伏安等电化学测试技术,分析了TiB2在NaCl-KCl熔盐中的阳极溶解和电化学还原过程.结果表明,TiB2阳极可发生电化学溶解,其中钛被氧化为Ti3+进入熔盐中,而硼则被氧化为B单质.Ti3+迁移至阴极,发...     

复合贵金属的钛阳极材料

钛基体上覆上一层铂及其合金或贵金属氧氧化物作为复合钛阳极,应用于阴极保护工业和电解工业中前景广阔.作为钛阳极的覆层,理论上讲可选用的贵金属和合金有65种组合,但考虑到资源、成本、要求的电化学性能和涂层的难易程度,能实用的仅限于铂和铂铱合金两种,而贵金属化合物的选择也仅限于氧化钌.     

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)     

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 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.