无锡市运河实验中学改扩建设计随感

通过对无锡市运河实验中学改扩建项目的回顾,阐述如何发掘原有校园空间环境的价值,并且通过借鉴中国古典园林的设计手法,使得老校园焕发出新生机。     

增加黄金储备规避外汇风险

近几年，我国外汇储备逐年增加，而美元汇率偏弱，使我国承担很大的外汇风险。为了规避外汇风险，应增加黄金储备。文中提出了我国增加黄金储备总量的理由以及增加黄金储备的途径。这些建议具有可操作性，可以提供给有关部门参考。     

Zeolite synthesis from paper sludge ash with addition of diatomite

BACKGROUND: This study aimed to investigate the synthesis of zeolites from paper sludge ash (PSA) with added diatomite to remove both NH₄⁺ and PO₄^3? for water purification. The PSA had low Si and significant Ca contents. Four types of diatomite: white (T‐W) and brown (T‐B) from deposits of marine origin in Takanosu, and white (S‐W) and gray (S‐G) from lacustrine deposits in Shonai, were added to NaOH solution to increase the Si content and thereby synthesize zeolites with high cation exchange capacity (CEC). RESULTS: The order of the amounts of Si extracted from the diatomite to the alkali solution was S‐W > T‐W = T‐B > S‐G, which correlates with the amorphous SiO₂ content of diatomite. The original ash without addition of diatomite yielded hydroxysodalite with CEC of about 1.0 mmol g^?1. For all samples, the addition of diatomite to the solution yielded zeolite‐P with a higher CEC, but the addition of excess Si inhibited the synthesis of zeolite‐P, and the CEC of the product was low. A product with high CEC including zeolite‐P was obtained in a solution with around 500 mmol L^?1 of Si concentration, and had the ability to remove both NH₄⁺ and PO₄^3?. CONCLUSION: Diatomite has the potential for used as an additive for the synthesis of high CEC zeolite from PSA. The product with zeolite‐P exhibited relatively high CEC, capacity for NH₄⁺ uptake, and the ability to remove PO₄^3? by precipitation, which is preferable for water purification applications. Copyright © 2008 Society of Chemical Industry     

γ射线对叶组织电阻变化的影响及动态分析

测试了水稻和烟草两种叶片经不同剂量的^60Co γ射线辐照处理后，组织电阻及离子外渗的动态变化情况。研究结果表明：当超过一定的剂量阈值后，随着辐照剂量的增加，两种植物的叶组织电阻均呈现先上升、后下降的变化规律；叶组织电阻的改变与离子外渗的变化趋势并不一致；用测量叶组织电阻的方法可以较灵敏地体现出植物对γ射线的动态反应情况。运用电生理学的基础理论对上述生理现象的产生原因从机理上进行了分析与探讨。     

基于多孔硅及MEMS技术的微型质子交换膜燃料电池

分析了研究和发展微型质子交换膜燃料电池(μPEMFC)的重要意义和应用前景,介绍了基于多孔硅及MEMS技术的μPEMFC最新研究动态,讨论了μPEMFC的结构设计、加工过程及性能,提出了μPEMFC仍存在的问题及其技术发展对策。     

永州电力通信交换网集中操作和维护的实现

分析实现永州电力通信交换网集中操作和维护的必要性，介绍了实现程控交换机远程操作和维护的两种方式，总结在实践过程中所得到的经验和教训。     

混合C=9制备壬基酚的研究

研究了以强酸性阳离子交换树脂为催化剂，以混合C9^=为原料制备壬基酚的工艺条件及树脂的再生方法，并考察了催化剂及再生剂的使用寿命。结果表明，混合C9^=可用于制备壬基酚，在110℃、苯酚与C9^=物质的量比为2．5、催化剂与C9^=质量比为30％的条件下连续反应64h，C9^=平均转化率达到85．9％，催化剂可反复多次再生使用，并具有较长的使用寿命。     

Density functional theory studies of Cu-zeolite de-NOx catalysts

Summary Recent progress in the modelling of exchanged Cu sites and their interactions with small molecules, based on DFT cluster calculations, is briefly reviewed.     

An object-oriented product database using ROSE

A product database for a design and manufacturing enterprise serves as a repository for the data needed to manufacture a product. This paper discusses how an object-oriented persistent object manager named ROSE, under development at Rensselaer, has been used in the Rensselaer CIM program to develop a STEP/PDES-compliant product database for its research test bed. In so doing, it provides an overview of the requirements for a product database system in an integrated design and manufacturing facility, and it discusses how the chosen system meets these requirements.     

Electrodeionisation 3: The removal of nickel ions from dilute solutions

The removal of nickel ions from dilute solutions using a process that combines an ion-exchange bed with electrodialysis has been studied. The main aspects include: the concentration of nickel ions in the diluate, the voltage over the cell and the current density distribution along the ion-exchange bed. The current density distribution provides insight into the state of the bed as it is simultaneously loaded with Ni²⁺ and regenerated with an electric potential difference applied perpendicular to it. A simple model is used to describe the state of the bed and the quantity of nickel removed from it as a function of time. Under specific conditions the precipitation of metal hydroxides is observed in the compartment containing the ion-exchange bed. The results show that hydroxide precipitation is related to the nickel concentration in solution and the electric potential gradient across the bed.