铁酸铜转化为硫酸铜的方法

在铜精粉的湿法冶金和生产硫酸铜的过程中，若焙烧温度控制不当，便会有大量的铁酸铜生成，而传统的湿法冶金和硫酸铜生产工艺，对此无能为力，不但造成资源的浪费，又增大了生产成本。     

微小型高功率CO_2气体激光器的新进展

简要介绍了 CO2 气体激光器、波导 CO2 激光器件微小型化的现状 ,着重介绍了自己研制的全金属环状波导管 CO2 激光器件 .该器件按增益体积整体缩放 ,扩散冷却型新技术、新概念 .并指出 ,该新技术、新概念将是今后气体 CO2 激光器微小型高功率化的最有效途径之一 .     

金属羰基化合物氧原子转移反应动力学和机理研究的信息与进展(二)

续上饶《上饶师专学报》１９９８年第６期）２．５信息之五氧转移试剂（ＲＡ－Ｏ）的Ａ－Ｏ键能及其取代基的性质是影响其反应活性的重要因素。２．５．１取代基的推电子性能增大胺类Ｎ－氧化物反应活性氧转移反应研究中最为吸引人的问题之一，是试图了解转移试剂的什么性...     

北海市污水排海管海底敷设浅谈

在北海市红坎污水处理厂海洋放流管工程中，考虑到基本的水文、地形条件和排放口的合理布局及污水处理程度等因素，在确保北海近岸各水域功能的水质指标保持在一定范围内的基础上， 管长由原设计的９１２。８ｍ缩短为７５５ｍ，扩散器也由原来的４７根竖管改为３８根，管径由２ ２００ｍｍ缩小为１ ８００ｍｍ，管壁厚度由２２ｍｍ缩小为１６ｍｍ。施工方案从顶管法改为整体吊装沉管法。     

Two methods to solve the ionospheric electron concentration horizontal gradient at Chongqing

The electron concentration horizontal gradient vector of the ionosphere and its south-north and east-west components over Chongqing station are analyzed and calculated, using the first approximation, time correlation and space correlation and another approach introduced. And then, the validity of the two methods is analyzed and compared. Foundation item: Supported by the National Natural Science Foundation of China (69571020) and the Research Fund for the Doctoral Program of Higher Education (RFDP1999048602) Biography: Chong Yan-wen(1972-), male, Ph. D. candidate, research direction: ionospheric modeling and inversion.     

Elementary Investigation of Increasing Polarization Performance of Air Electrode for CO2 Transfer

Air electrodes are the key components of Electrochemical carbon dioxide concentrating(EDC) cells. Therefore, the improvement of the polarization performance is beneficial to the increasing of CO2 transfer and cell stability .The preparing process of air electrode is improved by means of the pretreatment of active carbon(AC) and the selection of preparing method of platinum/carbon(Pt/C) powders. Besides, based on the analysis of orthogonal test results, the optimum preparing conditions of Pt/C powders in air electrode are achieved, that is, hydrazine hydrate concentration is 5%～10%, platinum capacity is 8mg/cm2, chloroplatinic acid concentration is 10.0mg/ml and water both temperature is 40℃.     

Theoretical advances of the structures and catalytic activities of small-sized gold nanoclusters

Gold nanoclusters exhibit extraordinary catalytic activities,but the dominating factor is still unclear due to the complexity of the structures.In this review,we briefly summarized the recent theoretical progress on their structures and catalytic activities.Combining the experimental and theoretical efforts,the structures of small-sized gold clusters have been explored systematically.Based on the determined structures,factors that influence the catalytic capabilities of small-sized gold clusters(Au_(16)-Au_(35))are studied using CO oxidation asa probe.The preadsorption energies of CO and O_2are found strongly correlated with catalytic activities,which could be affected by the clusters'geometries,sizes,and charge distributions.In addition,the presence of water could significantly lower the activation energy barrier of O_2 dissociation to enhance the clusters'catalytic activities.     

浅谈CO_2惰性气体消防技术要求

低压CO2惰化系统用于中国火力发电厂原煤仓保护的相关技术介绍。     

阻燃双层机织面料的研制

采用阻燃芳纶/粘胶混纺纱作为表经表纬,普通纯棉纱线作为里经里纬,设计并成功织造了五种表层阻燃、里层舒适的阻燃双层机织物试样.通过对试样进行阻燃性能测试,结果表明,五种试样的阻燃性能均达到GB 8965《阻燃防护服》的要求.对试样进行导水性、透湿性和透气性能测试,结果表明,五种试样的舒适性能都符合服用面料的要求.在今后的研究中,适当减小织物的克重、提高织物的经密,将能研制出更适合防护服要求的面料.     

细晶AZ61镁合金板材的CO2激光焊接性能

采用CO2激光器对2 mm厚的AZ61镁合金细晶板材分别进行了填充焊和自熔焊实验.研究了细晶镁合金板材的焊接性和填充带合金化稀土元素Ce对接头组织及力学性能的影响.结果表明，细晶板材的焊接接头热影响区不明显，组织较母材变化不大，半熔化区范围窄、液化程度低，未进行合金化的自熔焊焊缝组织较粗大，焊缝晶粒尺寸约15 μm，而填充焊焊缝组织为平均晶粒尺寸是5 μm的等轴晶，即合金化稀土元素Ce可细化焊缝组织，而且稀土元素Ce的加入能抑制柱状树枝晶区而扩大等轴晶区域范围.填带焊接头的平均抗拉强度和伸长率较自熔焊接头分别提高了6%和12%.