2007年钽铌工业发展评述

评述了2007年中国钽铌工业的运行状况.在世界钽铌产品总需求持续增长的带动下,中国钽铌工业继续保持良好的增长势头,工业生产总值达到22.79亿元,销售收入达到23.37亿元,分别比上年增长了27.9%和28.8%.2007年是中国钽铌工业快速发展的一年,矿产量和冶炼品产量增加,高端钽铌产品的加工和出口快速增长.最后分析了中国钽铌工业发展中存在的突出问题,并提出了促进行业发展的措施.     

钽铌工业生产及其展望

简述了钽、铌工业生产的新进展,重点介绍了钽、铌矿和钽、铌产品的生产技术进步和应用现状;分析了钽、铌产品的市场结构和价格走势,最后展望了钽、铌工业生产的未来发展.     

钽铌资源及中国钽铌工业的发展

详细综述了国内外钽铌资源的储量、特点、品位和分布及世界钽铌产品的结构、消耗数量及应用领域.着重介绍了我国钽铌在采矿、选矿、冶金和钽铌金属加工方面的技术进步和创新.最后作者对我国钽铌事业的发展提出了建设性的意见.     

钽铌工业统计

钽铌国际研究中心(TIC)最近统计了其协会成员各种钽铌产品的矿产、加工材和交货量,其中包括化学半成品.根据目前工业需要,从2001年上半年起原钽铌加工材分类已做了调整,化学用铌材和真空级FeNb、Ni-Nb材首次单独归类.……     

近3年来日本钽铌进出口状况

总结了亚洲金属网公布的有关日本2003年、2004年及2005年1月～5月钽铌原料与制品的进出口统计数据,分析了日本钽铌市场的状况.预计2005年日本钽的总需求量为331 t,同此下降6.5%     

2006年中国钽铌工业发展述评

评述了2006年中国钽铌工业的运行状况.在世界钽铌产品总需求持续增长的带动下,中国钽铌工业也呈现出良好的增长势头,总产值达到17.82亿元,销售收入达到18.15亿元,与2005年相比分别增长了23.58%和20%.中国电容器用钽粉和钽丝的质量已接近国际先进水平,产量已分别占世界产量的21%和56%以上,出口总量达到总产量的90%以上.最后分析了中国钽铌工业发展中存在的突出问题,并提出了促进行业发展的措施.     

钽、铌专利研究

介绍了钽、铌专利文献的检索方案及通过专利方法确定钽、铌技术领域中核心技术的原则,并依据这些原则确定钽、铌技术领域中的核心技术.通过对钽、铌专利的研究,提出宁夏东方钽业股份有限公司应采取的对策.     

2005年中国钽铌工业的统计与分析

2005年,世界钽铌工业总需求保持稳步增长.在世界消费类电子产品持续增长的带动下,中国钽铌工业也出现了明显的增长势头,总产值达到14.42亿元,与2004年比增长了11.09%.宁夏东方有色金属集团有限公司开发的150 000 μFV/g电容器级钽粉已供用户试用,并且研制出了适合目前铌电容器使用的80 000～100 000 μFV/g高比容铌粉及Nb0粉.2005年,世界铌粉、丝、制品市场需求呈现大幅增长,中国电容器级钽粉、丝的出口量都达到了总产量的85%以上,加工制品出口量也达到了75%以上.     

中国钽铌工业的进步与展望

文章简要地回顾了九○五厂钽铌工业发展历程，并与世界钽铌工业作了对比分析。以详实的资料和基础数据，清晰地描述了我国钽铌工业发展现状和技术发展历程及其在世界钽铌工业发展中所处的地位和竞争能力；充分阐明了我国稀有金属钽铌资源及其在冶炼、加工技术领域中所存在的问题和面临的形势。从国家安全角度及行业整体发展的高度，提出了对国内稀有金属钽铌行业进行重组整合和积极开发国外资源的可持续发展的战略构想。     

电容器用钽铌粉的研究进展

概括介绍了电容器用钽铌粉的研究进展,介绍了钽粉的3种钠还原制备方法的化学反应机理并进行了比较,同时还介绍了铌粉的制备方法,包括铝热还原法、电解还原法、蒸气还原法、钠还原法和金属热还原法;阐述了钽铌粉中杂质的测定方法以及有关钽铌粉的其它研究进展.     

Gender differences in publication productivity in psychology in India

An analysis of gender differences in psychology in India provides quantitative and qualitative assessment of R&D output contributed by psychologists with the indication of the trend of growth, skewness, relatedness, co-authorship pattern of productivity.     

Metrology in Chemistry in Germany

The system for Metrology in Chemistry in Germany is described. At the national standards level, a network of high-level chemistry institutes coordinated by the national metrology institute, PTB, provides the primary references for chemical measurements. A dissemination mechanism employs chemical calibration laboratories accredited within the framework of the German Calibration Service (DKD). They act as “multipliers” between the national standards level and the user level by providing the user with calibration means which are traceable to the SI via national standards. Traceability structures in clinical chemistry, electrochemistry, elemental analysis and gas analysis are described     

Natural radioactivity in drinking water in private wells in Finland

Natural radioactivity in drinking water was determined in population-based random study of 472 private wells. The mean concentrations of (222)Rn, (226)Ra, (234)U, (238)U, (210)Pb and (210)Po in drilled wells were 460, 0.05, 0.35, 0.26, 0.04 and 0.05 Bq l(-1), and in wells dug in the soil were 50, 0.016, 0.02, 0.015, 0.013 and 0.007 Bq l(-1), respectively. Approximately 10% of the drilled wells exceeded a radon concentration of 1000 Bq l(-1) and 18% a uranium concentration of 15 microg l(-1). The mean annual effective dose from natural radionuclides for a drilled well user was 0.4 mSv and 0.05 mSv for a user of a well dug in the soil. The effective dose arising from (222)Rn was 75% of the total of all natural radionuclides for drilled well users. As regards long-lived radionuclides, (210)Po and (210)Pb caused the largest portion of the effective dose. The dose arising from (238)U, (234)U and (226)Ra was only 8% of the total of all natural radionuclides.     

Natural radioactivity in drinking water in private wells in Finland

Radiation Protection Dosimetry     

Optische in situ Schichtdickenmessung in Bedampfungsanlagen. Optical in situ film thickness monitoring in coating systems

Optical film thickness monitoring is more precise than crystal monitoring. The optical measurement makes use of the fact that the intensity of a monochromatic light beam which is reflected on a film will change periodically with increasing film thickness. The measurement is performed at an exchangeable test glass that is positioned beside the substrates and is therefore coated in the same way as the substrates. The accuracy of cut‐off is achieved by a “fit” of a theoretical curve shape to the measured values. Order filters are used to ensure that, at a certain wavelength, higher deflection orders do not influence the measurement when a monochromator grating is used.     

Spanish experience in education and training in radiation protection in medicine

In most of its publications, the International Commission on Radiological Protection has highlighted the importance of education and training in radiation protection (RP) for medical exposures. Spain, like other Member States of the European Union, has implemented the Directive and the Guidelines in the medical area. The purpose of this paper is to present the Spanish experience in RP education and training in medicine, the different objectives established according to professional levels, existing regulations and feedback obtained from various RP actions.     

Differences in coagulation in clotting of vascular access in hemodialysis patients

Arteriovenous graft (AVG) thrombosis is a frequent cause of graft failure. We evaluated coagulation protein concentrations, platelet function, and viscoelasticity factors in 20 hemodialysis (HD) patients with AVGs. The goal was to determine whether significant differences in protein concentrations, platelet function, and viscoelasticity factors exist among dialysis patients requiring frequent AVG declot procedures vs. those who do not. Twenty HD patients were enrolled: 10 frequent clotters (>3 declots in the previous year) and 10 were nonclotters. Patients on antiplatelets or chronic anticoagulation were excluded. Laboratories were drawn pretreatment and heparinase was added to counteract any potential heparin effect. Coagulation protein concentrations including tissue factor (TF), thrombin/antithrombin III complex (TAT), and prothrombin fragment 1 + 2 (F₁₊₂) were assayed. The time to clot onset was measured by force onset time (FOT). Platelet contractile force (PCF) measured the force produced by platelets during clot retraction, whereas clot rigidity was measured as clot elastic modulus (CEM). FOT, CEM, and PCF were measured by Hemodyne. Both groups had upregulation of the TF pathway, as TF, TAT, and F₁₊₂ levels were similarly increased over baseline levels. Hemodialysis patients with frequent AVG clotting had higher levels of both PCF and CEM compared with nonclotters. Additionally, the frequent clotters had a lower FOT relative to nonclotters, although both were considered in the normal range. Our study suggests that HD patients with recurrent AVG thrombotic events form clots with higher tensile strength compared with HD patients without recurrent graft thrombosis.