丙烯在镍离子高分散催化剂上反应过程的TPSR EPR XPS UV-DRS研究

用ＴＰＳＲ法对丙烯在硫酸镍高分散型催化剂上反应过程进行考察；用ＮＨ３－ＴＰＤ法对ＮＨ３吸附中心进行跟踪，发现除强弱两类酸中心外，确有第三类活性中心，此第三类活性中心可能就是配位催化活性中心。     

太原市SO2污染现状及防治对策

太原市是全国SO     

矿渣粉煤灰的优势互补效应

研究了质量分数为50%总掺量的矿渣粉煤灰复合水泥的性能,发现矿渣、粉渣灰以适当的比例掺入时,可以产生优势互补效应,并分析了产生优势互补效应的原因.     

钯铁合金镀液和镀层中钯和铁的同时测定

在酸性介质中，铁和钯分别与亚硝基Ｒ盐（ＮＲＳ）络合形成绿色的Ｆｅ－ＮＲＳ和红色的Ｐｄ－ＮＲＳ．利用它们的吸收光谱性质的差异，可用双波长系数法在水相中同时测定Ｆｅ和Ｐｄ．实验证明，两络合物的摩尔吸光系数分别为１．９４×１０４（对铁）和１．６３×１０４（对钯），线性范围分别为０～６０μｇ／ｍＬ和０～７０μｇ／ｍＬ，相对标准偏差小于０．５％，回收率为９６％～１０５％．本方法简便、快捷、准确、重现性好．适用于合金镀液及镀层中铁和钯的同时测定．     

物价变动条件下投资项目经济评价指标计算

分析了现行经济评价方法中对物价受动处理存在的一些问题，论述资金时间价值的两重性，按费用和收益的物价变动率相同和不同两种情况，推导了项目经济评价指标正确的计算方法，并指出了应注意的事项和应用的范围。     

A family of mammalian Na+-dependent L-ascorbic acid transporters.

Vitamin C (L-ascorbic acid) is essential for many enzymatic reactions, in which it serves to maintain prosthetic metal ions in their reduced forms (for example, Fe2+, Cu+), and for scavenging free radicals in order to protect tissues from oxidative damage. The facilitative sugar transporters of the GLUT type can transport the oxidized form of the vitamin, dehydroascorbic acid, but these transporters are unlikely to allow significant physiological amounts of vitamin C to be taken up in the presence of normal glucose concentrations, because the vitamin is present in plasma essentially only in its reduced form. Here we describe the isolation of two L-ascorbic acid transporters, SVCT1 and SVCT2, from rat complementary DNA libraries, as the first step in investigating the importance of L-ascorbic acid transport in regulating the supply and metabolism of vitamin C. We find that SVCT1 and SVCT2 each mediate concentrative, high-affinity L-ascorbic acid transport that is stereospecific and is driven by the Na+ electrochemical gradient. Despite their close sequence homology and similar functions, the two isoforms of the transporter are discretely distributed: SVCT1 is mainly confined to epithelial systems (intestine, kidney, liver), whereas SVCT2 serves a host of metabolically active cells and specialized tissues in the brain, eye and other organs.     

Contents and distribution of rare earth elements in wheat seeds

Contents of 15 rare earth elements (REEs) in the seeds of 60 breeds of wheat have been analyzed by the inductively-coupled plasma mass spectrometry (ICP-MS). The distribution pattern of contents of REEs in wheat seeds has been observed and compared with that in soils. Comparison with literature data has also been made. The results show that the background of REEs in wheat seeds is 10-11-10-8 g.g-1, 3-4 levels lower than in soils. The distribution pattern is light REEs higher in contents and slight Eu-anomaly, similar to that in soils. The data obtained in this study can accurately represent the background content of REEs in wheat seeds.     

铸造铝青铜的摩擦特性与机械性能

针对高压齿轮泵侧板的工作特点，熔制了五种铸造铝青铜并分别进行了拉伸性能、摩擦特性和耐磨性实验，为该侧板国产化提供了必要的准备。     

煤炭企业成本主要影响因素的分析

在对煤炭企业成本主要影响因素定性分析的基础上，采用人工神经网络BP模型对其进行定量研究，并将它们应用到煤炭企业实际，取得了良好的效果。     

利用计算机求解实际应力应变方程

本文从理论上分析了可用最小二乘法替代经验方法近似求解实际应力应变方程的可行性，并用Ｑｕｉｃｋ Ｂａｓｉｃ语言编制程序，求出方程的解，提出了拉伸试验的一体化设想。