固体电解质氧电池与应用

固体电解质氧电池的应用已取得了显著成效,本文系统地概述了该电池和定氧技术的原理与应用,并在实验条件下测定了△G_(Cu_2O)。     

Cation/H+ antiporters mediate potassium and sodium fluxes in Pichia sorbitophila. Cloning of the PsNHA1 and PsNHA2 genes and expression in Saccharomyces cerevisiae

Pichia sorbitophila grows rapidly in the presence of very high NaCl concentrations. Under these conditions, even when the K(+) concentration is low, P. sorbitophila cells can maintain low Na(+) and high K(+) contents. This remarkable capacity of P. sorbitophila fails when the external pH is not acidic. This indicates that Na(+) efflux is mediated by an electroneutral Na(+)/H(+) antiporter. We have cloned and sequenced two genes designated as PsNHA1 and PsNHA2, which probably encode two antiporters of this type. The genes present high similarity with the corresponding genes from other yeasts. The heterologous expression of PsNHA1 or PsNHA2 in a Saccharomyces cerevisiae mutant lacking the Na(+) efflux systems and sensitive to high concentrations of Na(+) and K(+) rescued the tolerance and the ability to extrude both cations. The Accession Nos of the sequenced DNA fragments are: PsNHA1, AJ496431; PsNHA2, AJ496432. (TC 2.A.36) Copyright 2002 John Wiley & Sons, Ltd.     

基于CAN总线的电梯群控系统的通信接口设计与实现

介绍了基于CAN总线的电梯群控系统的设计与实现方法,并给出了CAN总线通信接口的硬件电路和软件设计方法。     

一种纤维素/钛白粉阳离子交换扩张床吸附剂

为了使得扩张床吸附技术更好地用于蛋白质分离，提出一种含有羧甲基阳离子交换基团的扩张床吸
附剂.采用了反相悬浮热再生法，将超细钛白粉包埋于再生纤维素骨架之中，制备成均质型纤维素/钛白粉
复合微球；再以复合微球作为扩张床吸附基质，用环氧氯丙烷交联后与一氯乙酸反应，得到羧甲基阳离子
交换型扩张床吸附剂；测定了吸附剂在扩张床中的扩张特性和蛋白质吸附性能.结果表明，该吸附剂具有
良好的扩张床膨胀和吸附性能，每升吸附剂的溶菌酶饱和吸附容量达98.7 g，扩张床中蛋白质穿透曲线形
状与填充床基本相似，每升吸附剂的10％穿透吸附容量可达到69.3 g溶菌酶.     

谷氨酰胺提取的研究

对强酸性阳离子交换树脂提取分离发酵液中L-谷氨酰胺（L-Gln）的工艺条件进行了研究。确立了提取的最佳条件为：强酸性阳离子交换树脂的上柱液pH为3．5，氨水的洗脱浓度为0．03mol／L，洗脱速度为1．0mL／min，提取得率为70％左右。     

累托石有机改性实验研究

为制备有机累托石(OREC)，采用十六烷基三甲基溴化胺(CTAB)对湖北钟祥累托石进行了有机改性，研究了温度、时间和pH值对CTAB交换率的影响，并与十二烷基磺酸钠进行比较．结果表明：CTAB的效果较十二烷基磺酸钠好，在温度为70℃，pH值为7．37，反应时间为2h的条件下，CTAB的交换率可达89．1％，累托石的d001由1．1392nm增至1．3598nm．     

Mechanically Induced Cation Redistribution and Spin Canting in Nickel Ferrite

The structural and magnetic evolution in nickel ferrite (NiFe₂O₄) caused by high-energy milling are investigated by Mössbauer spectroscopy. It is found that the nanostructural state of the milled NiFe₂O₄ is characterized by a reduced concentration of iron ions on tetrahedral sites. The degree of inversion in NiFe₂O₄ is calculated from the subspectral area ratio of both high- and zero-field Mössbauer spectra. Several interesting features are involved in the work, e.g., superparamagnetic relaxation, mechanically induced cation redistribution, and spin-canting effect.     

New modifications of poly(vinyl alcohol)s and their applications

Poly(vinyl alcohol) (PV-OH), prepared from poly(viny) acetate), is used widely in many industries. Various grades have been produced, with different degree of polymerization and degree of hydrolysis. Recently, novel modified (PV-OH)s with anion, cation, silanol or hydrophobic groups have been studied and developed. They have new properties in addition to those of ordinary PV-OH and have new applications. The methods of modification and the characteristics and some applications of the modified polymers are described.     

A/B-Ratio and Transport Properties of (La0.85Sr0.15)sCoO3−δ Perovskites

The perovskites (La_0.85Sr_0.15)_0.98CoO_{3 –} and (La_0.85Sr_0.15)_1.00CoO_{3 –} have been investigated using x-ray diffraction (XRD), scanning electron microscopy (SEM) and electrical conductivity relaxation (ECR). This system was chosen in order to investigate the influence of cation vacancies on the transport properties in the materials. From ECR-measurements it is concluded that no difference in the chemical diffusion coefficient for oxide ions between the two samples can be found. The activation energy for the chemical diffusion coefficient has been found to be 107 ± 5 kJ mol^{– 1}. However, the surface exchange coefficient differs between the two samples. The Co-rich sample has a significantly higher surface exchange coefficient than the A/B-stoichiometric sample. For both samples the surface exchange coefficient was almost independent of the temperature. At all temperatures the Co-rich sample had a significantly higher electrical conductivity. The difference in electrical conductivity between the two samples diminished when going to higher temperatures. Both materials can be assigned to a single phase hexagonal perovskite. An annealed sample of (La_0.85Sr_0.15)_0.98CoO_{3 –} did however contain an unidentified secondary phase on the surface.