基于闭路电视网络的计算机远程控制

介绍了一种在闭路电视网络上利用DTMF变换技术和调频技术相结合来传输计算机串行控制编码信号的方法，并且将这种控制方法应用到计算机远程广播控制系统中。     

Longitudinal Wave Propagation in Dielectric Waveguide Array

Based on the established rigorous theory for two-dimensionally periodic (2DP) medium, Longitudinal propagation in Dielectric Waveguide Array (DWA) was analyzed in detail. Firstly, given longitudinal wave vector (k _z), Brillouin dispersion relations between transversal wave vectors were analyzed. Interactions between space harmonics were also studied. Secondly, on condition that transversal wave vector k _x equaled k _y, dispersion relations between longitudinal and transversal wave vectors were analyzed in detail. Because of interactions between space harmonics increasingly getting stronger with k _z or modulation coefficients increasing, stop-bands could be distinctly displayed and thus longitudinal propagation in DWA could be comprehensively analyzed. The applications about longitudinal propagation in DWA were also discussed.     

Alleviation Effect of Lanthanum on Cadmium Stress in Seedling Hydroponic Culture of Kidney Bean and Corn

Since1970s,rare earths(RE)have been exten-sively used as micro-fertilizers for crops in China.Ithas already been proved that REcani mprove the pro-duction and quality of crops.However,there havebeen a fewinvestigations about using RE as regulatorin pollution ecology.For example,An et al[1]studiedthe effects of O3on wheat growth and the protectiveeffect of RE.Yan and Zhou et al[2,3]discussed theprotective effect of RE on plants under acid rainstress.Jia et al[4]and Hu et al[5]reported th…     

光通信用垂直腔面发射激光器的进展

垂直腔面发射激光器(VCSEL)以其优异的性能有望成为信息时代的新光源.文章介绍了用于光通信的VCSEL的开发现状.     

重视标准工作、强化标准管理是企业生存与发展的基础

本文论述了企业标准化工作的重要性及标准化工作需重视的几个方面。论述了采用国际先进标准及建全标准化管理体系的重要性。     

浅析上海市建筑防水材料近况

本文浅析了上海市建筑防水材料的生产、质量及应用情况,并对防水工程的发展提出了建议。     

上海市电话局用户接入网发展状况

上海市电话局用户接入网建设经历了调研、网络规划、启动实施和进一步完善、规范四个怅阶段、现已基本形成了覆盖政府机关、大专院校、医院、商务大楼及高层建筑、新建住宅小区、区级以上图书馆等范围的用户光纤网络，为加快经济建设步伐、满足多层次用户需求、拓展电信新业务打下了坚实基础。     

4，4＇－二苯醚二甲酸改性PET的合成与表征

４，４＇－二苯醚二甲酸（ＯＢＢＡ）是一种重要的液晶聚合物单体。以此作为改性组分，合成了一系列ＰＥＴ共聚酯，并用１Ｈ－ＮＭＲ、ＦＴ－ＩＲ、ＧＰＣ、二甘醇和端羧基测定等方法进行了表征，同时对改性单体的转化率和合成共聚酯的反应速率进行了测定，结果表明，所选择的合成方法可以获得较高的转化率；反应速率则随ＯＢＢＡ的增加而增大。     

非协调h－p型有限元补偿法

详细讨论了非协调ｈ－ｐ型有限元的补偿法，给出了令人满意的收敛阶．     

耐蚀性钛合金

概述了耐蚀性钛合金的发展过程及Ｔｉ－Ｎｉ－（Ｐｄ、Ｒｕ）－Ｃｒ、Ｔｉ－Ｒｕ－Ｎｉ、Ｔｉ－ｐｄ－Ｃｏ等新型耐蚀钛合金的耐蚀性能。