Correction for hydrometeor attenuation of C band radar data

C band digital weather radar observed data, collected from the Huaihe River Basin Energy and Water Cycle Experiment (HUBEX), are used for the study of correction of hydrometeor attenuation in the Fuyang region. An iterative algorithm is used for the correction scheme. The preliminary study shows that there may be a big difference between the radar observed reflectivity and the corresponding corrected one. Based upon the hourly precipitation data derived by the radar data sampled from the observations at intervals of 10 min and rain gauge recorded hourly precipitation data, it is found that the attenuation correction algorithm gives better results than those from direct observation. It is also shown that the temperature of hydrometeors may strongly affect the results derived from the attenuation algorithm.     

政府选择与我国高技术产业发展

本文从产业政策、资金政策和资源政策等三方面分析了政府在高技术产业中的作用,并针对我国的实际状况提出若干建议。     

超薄双层胶结复合结构低频超声类兰姆波定征方法

提出用低频超声类兰姆波定征方法来估计超薄双层胶结复合结构各层的纵波声带、横波声速、厚度和密度等参数,采用超声耦合剂耦合方式,结合超声漏类兰姆波频哉分析方法获取复合结构类兰姆波色散曲线,提出以色散特性为基础的低频超声类兰姆波定征方法和在最小二乘意义下以色散同工线为基础的反向算法对超薄双层胶结复合结构进行参数估计,进上步分析了影响估计准确性的各种因素,研究了低频超声类兰姆波定征方法对超薄双层胶结复合结     

旅游城市的不确定性多目标环境规划优化模型框架研究

简要分析了旅游城市环境规划的特点,针对性地提出了一套不确定性模糊多目标旅游环境系统规划优化方法,这是首次将不确定性多目标规划方法应用于以旅游业发展为重点的城市环境规划领域。并相应地建立了旅游城市环境不确定性模糊多目标系统规划优化模型（ＩＦＭＯＰＯＭＴＵＥ）,既把各种环境要素和经济要素有机地整合入模型中,又充分考虑了旅游城市环境发展的不确定性,通过人机交互式方法,将专家和决策者的意见落实在模型参数上     

聚合物/层状无机物插层型纳米复合材料

本文概述了适于制备聚合物/层状无机物插层型纳米复合材料的主客体材料类型及聚合物插入到无机物层间的影响因素。简介了该复合材料的制备方法、结构和性能特征及潜在的应用前景。     

简单遗传算法的一种改进算法

针对简单遗传算法收敛速度慢的问题,结合复合形法,提出了一种改进算法并将其应用于系统辨识,仿真结果表明,改进后的算法具有收敛快,精度高的优点。     

Singularity of software reliability models LVLM and LVQM

According to the principle, “The failure data is the basis of software reliabilityanalysis”, we built a software reliability expert system (SRES) by adopting the artificialtechnology. By reasoning out the conclusion from the fitting results of failure data of asoftware project, the SRES can recommend users “the most suitable model” as a softwarereliability measurement model. We believe that the SRES can overcome the inconsistency inapplications of software reliability models well. We report investigation results of singularity and parameter estimation methods of models, LVLM and LVQM. Foundation item: Supported by the National Natural Science Foundation of China Biography: Biography: XU Ren-zuo (1946-), male, Professor, Research interests include software engineering, software reliability engineering, software quality guarantee technology, reliability theory, software safety and security.     

信息时代高校图书馆员继续教育的思考

本阐述了高校图书馆员进行继续教育的专业需求,参与馆员的心理认同和工作开展的设想,指出进行继续教育是高校专业馆员的重要途径。     

月内短期气候预测中若干问题的讨论

首先介绍了月平均环流在气候预测中的应用,在此基础上,重点讨论了影响月内短期气候预测的若干因素,对可预报性的时空依赖性,初始场的作用,集合预报以及后处理进行了分析,并对其未来的发展做了展望。     

24m无粘结预应力砼大梁的结构设计

结合工程实例介绍了无粘结预应力检大梁的结构设计、内力分析、配筋计算和构造措施,以供在类似工程设计中参考。