作为电催化剂的炭在电化学能转化中的应用

一、引言各种炭,如乙炔炭黑、石墨及活性炭被应用于许多电化学能转化体系。在Zn/MnO_2体系中,给阳极加入石墨以提高其电导率;在初级锂—卤氧化物电池中,阳极的主要成分是乙炔炭黑,它起催化剂和集电器双重作用;在燃料电池或活泼金属—空气电池中(如Zn—空气     

毫微过滤和电渗析联合法处理纸浆漂白废水

采用毫微过滤（nanofiltration）和电渗析相结合的方法，一台0．5m3/h地装置可脱除95％污染的有毒的有机卤化物、有毒的有机化合物、盐类和色素，水可重复利用。而普通的生物处理法仅能减少氯化有机物质50％左右。新工艺中段废水先经絮凝和过滤预处理以脱除纤维。接着，螺旋形和管形构型的有机和无机毫微过滤膜在ZXIc‘Pa的压力和40℃温度下进行操作以脱除95％的有毒的有机卤化物和有毒的有机化合物以及40％的盐类，渗透量为150l／h·m’。然后，滤波进入装有阴离子交换膜和阳离子交换膜的电渗析装置，在那里盐含量从1500mg／l减少至60mg…     

市场综述

CPU:市场保持平稳本月以来,CPU市场的总体走势比较平稳,AMD方面,除了极个别的型号价格有比较大的变化外,其他大部分都基本保持价格稳定,价格波动比较厉害的是三年盒装的XP2800+,这款基于BARTON核心的ATHLON XP,上个月价格还在1650元左右摆动,而在本月初就突然降到1350元,降幅之大实在令人难以置信,不过,由于同样是BARTON核心的三年盒装XP2600+现在才卖920元,因此就算XP2800+已经降到1350元的,价格依然还是明显     

500kW考验回路水中F－和Cl－离子的低压离子色谱分析

建立了用低压离子色谱法测定水中微量Ｆ－和Ｃｌ－离子的新方法．该方法快速、简单、准确。Ｆ－和Ｃｌ－离子的检测限分别为０．００５μｇ／ｍＬ和０．０１μｇ／ｍＬ，相对标准偏差分别为１．７％和３．６％，回收率分别为９８％和１０３％．该方法特别适用于５００ｋＷ回路水中微量Ｆ－和Ｃｌ－离子的快速同时测定     

信息荟萃

本刊 2 0 0 0年度编委会年会召开　　本刊讯　 2 0 0 0年 1 2月 2 7日 ,本刊 2 0 0 0年度编委会年会在长沙召开。中国工程院院士、国防科技大学计算机学院院长、《计算机工程与科学》杂志社社长卢锡城教授 ,国防科技大学计算机学院副院长、副社长兼编委会副主任王志英教授 ,在长的部分顾问和编委会委员以及编辑部全体工作人员出席了年会。会议由王志英副社长主持。会议听取了陈怀义主编代表编辑部所作的《计算机工程与科学》杂志编辑部 2 0 0 0年工作汇报。他说 ,今年是《计算机工程与科学》杂志变更为双月刊后试运行的第二年 ,是改为大 1 6…     

The Remote Product Check and Acceptance Technology Based on Web

1 Introduction The remote product check and acceptanceis ani mportant part of the e-purchase ,andthelast essential linkto a successfully e-purchase .By tri mming and opti mizing the traditional purchase process and the automation ofrepetitive work,the e-purchase systembased on Internet technology greatly raises the efficiency of bothsides ofthe business ,reduces the cost and the cycle of order form disposal as well as the items on stock of both sideswhich eventuallyleads tothe falling of the p…     

Flume Experiment on Stream Blockage by the Debris Flow From Tributary

Stream blockage by the debris flow from tributary valleys is a common phenomenon in mountainous area,which takes place when large quantities of sediment transported by debris flow reaches a river channel causing its complete or partial blockage.The dam formed by debris flow may causes upstream and downstream flooding,and presents great threat to people and property.Because of the catastrophic influence on people and property,debris-flow dam has attracted many attentions from the researchers and local administration.But,lit- tle attention has been given to the quantitative interrelationships of the potential influential factors.In this pa- per,the interrelationships of important influential factors caused the stream blockage by debris flow were ana- lyzed through flume experiment,and a model to predict the blockage was presented.     

The effect of pitch and collimation on radiation dose in spiral CT

1 Introduction Spiral computed tomography (CT) was intro- duced in clinical practice in 1980s. Its distinctive characteristic is continuous data acquisition and con- tinuous tube rotation with high speed while simulta- neously translating the patient through the gantry.[1] Owing to these functions the spiral CT possesses the ability to scan an entire organ volume within a single breathhold. Thus, the anatomical section is contiguous and therefore the reliable demonstration of small le- sions…