A STUDY ON ACIDITY AND CATALYTIC PROPERTY OF [B] ZSM-5 CATALYST MODIFIED WITH SILICON COMPOUND BY CHEMICAL SURFACE DEPOSITION OF LIQUID-PHASE TECHNIQUE

The boron heteroatom zeolite catalyst has been modified with silicon compound by Chemical Surface Deposition of Liquid-phase (CLD) technique and the catalytic property of the modified catalyst is studied. Meanwhile, the acidity of the modified zeolite catalysts is characterized through TPD and IR technique, and the fluid adsorption method is used to determine its pore structure. The relationship between the catalytic property of the zeolite catalyst and its pore structure, its acidity has been found. The results of toluene-ethylene alkylation reaction indicate that the selectivity of p-ethyltoluene on the modified zeolite catalyst is higher than that on the zeolite catalyst before silanizated, reaching 94.14%.     

用TMS320C6201实现H.263编译码系统

介绍了用TMS320C6201实现视频压缩编码标准H.263的编译码系统,并以编码系统为例,给出其硬件设计及软件的优化处理方法.     

纳米TiO2的光催化作用及其应用研究进展

纳米TiO2 是一种宽禁带半导体光催化剂 ,可用于污水处理、空气净化、灭菌消毒、医疗、化学合成、贵金属提取冶金、能源材料等多个领域 ,未来的研究发展重点应是实用化纳米TiO2 光催化剂的开发及高效光反应器的研制。     

Laboratory study of property-modified prebaked carbon anode and application in large aluminum electrolysis cells

A kind of complex additive mainly containing Al, Mg, F, and O was prepared. The synthetical performances of the property-modified prebaked anodes containing additives were tested in laboratory. On the basis of ideal testing results obtained, a large number of industrial prebaked property-modified anodes are prepared in a large-scale aluminum company. Further more, they are all used in 160 kA prebaked anode aluminum electrolysis cells. The statistic result show that, compared with common anodes, the property-modified ones enhance current by 11.6 kg per ton aluminum averagely.     

黄磷渣制备多孔陶瓷的研究

研究了用黄磷渣代替部分粘土作陶瓷原料，既可以解决磷渣对环境的污染和堆放占用耕地问题，使该固体废弃物资源化，又能缓解陶瓷原料的短缺。     

MIL-STD-1553B总线测试仪软件开发

充分利用1553B总线和USB总线的特点,研制了一种USB总线接口的MIL-STD-1553B总线测试仪,该测试仪通过USB总线来控制1553B总线,使得计算机通过USB总线便可与各种1553B总线的设备进行数据通信,从而使得1553B总线测试更加方便快捷.文中介绍了测试仪的软硬件系统结构,详细讨论了测试仪通用驱动程序和应用程序的体系结构、开发中使用的数据结构,以及应用程序的函数接口和开发流程,最后给出软件测试方法.     

多声道平衡及自动校准技术发展渐入佳境

1960-1970年那段时间被称为立体声的黄金岁月 ，那时要调试并建立一套立体声系统是非常简单的，整个系统只包括一对音箱，一个功放（纯A/V功放或附带收音功能）或纯粹的无线电接收器以及诸如唱片机这类型的音源即可，而设置过程更是简单，只需要连接很少的几根线，再将扬声器放到一个合适的位置就可以了。[编者按]     

An alternating technique for evaluating weight functions for 3-D surface flaws in finite solid bodies

An efficient method, based on the Schwarz–Neumann alternating technique, is presented for computing weight functions of a general solid (3-D as well as 2-D), with embedded or surface-flaw configurations. The total rate of change of the crack-opening displacements, due to simple perturbations of crack-dimension characteristics, is conveniently decomposed into the infinite-domain and boundary-correction parts. The former is determined from available analytical solutions of ideal-shaped cracks, whereas the latter is computed numerically by imposing nil boundary-traction requirements for the displacement field corresponding to the weight functions. Numerical examples, with solutions for 3-D weighted-average and local stress intensity factors, indicate that the proposed method is very accurate and efficient.