天文观测科学实践中心技术实现

天文观测科学实践中心是一个以天文观测为核心的网络实践体验中心,以网站的形式向公众提供服务。网站建设使用HTML、CSS、JavaScript和JSP/JaveBean等技术;基于B/S结构实现望远镜远程控制;采用Windows Media技术实现视频发布。建成的网站为用户提供了全新的天文观测实践体验机会,达到了传播天文知识的目的。     

Taguchi design-based seismic reliability analysis of geostructures

This paper presents a methodology to evaluate the seismic reliability of geostructures in an optimal way. Taguchi design of experiments are adopted to find the most efficient and cost-effective combination of material properties in the uncertainty domain. Twelve uniform and mixed design models are tested. A polynomial-based response surface meta-model is built for each one and the accuracy of perdition is examined using 10,000 Monte Carlo simulations. A two-dimensional gravity dam is used as a vehicle for probabilistic transient analyses. The ground motion record-to-record variability is added as well using over one hundred earthquake records selected based on probabilistic seismic hazard analysis. Dynamic sensitivity of epistemic random variables are evaluated for the first time. Finally, an efficient and practical procedure is proposed in order to determine the reliability index of the geostructures. This approach, in fact, can be generalised for any type of engineering structures dealing with multi-hazard problems.     

可视会商业务系统的设计与应用

从分析可视会商业务系统的发展现状入手,介绍了可视会商业务系统的发展历程和组建方式,并针对气象部门的业务应用需求,规划设计了江西省、市之间基于H.323标准的建设方案。根据这个方案,采取部门宽带IP网加硬件终端的组网方式,建设了江西可视会商业务系统。该系统可以实现多种会议控制、双屏显示、双视传送、VGA图像无失真传送等功能。     

参数化线状符号设计思想与实现

提出了组合式绘制线符号的方法,在此基础上提出了参数化线状符号设计思想,并用面向对象的方法和程序设计语言予以组织,实现。     

计算机辅助药物设计中用于建模的计算方法研究进展

通过检索国内外相关领域的大量研究文献,并结合作者的研究经验,综述了计算机辅助药物设计中计算方法的发展及其应用的最新进展,并对计算方法的选用原则进行了探讨,以期为从事CADD工作者合理选择建模计算方法提供有价值的参考。     

面向对象的配电GIS系统空间数据模型与组织

GIS在配网自动化系统中的应用越来越深入和广泛,随着配电网络各种设备的复杂性提高,传统的分析设计方式已很难满足现有配电网络的飞速发展。面向对象的分析与设计方法作为一种先进的系统设计方法,能很好地应用于规模较大、层次较复杂的配电网络设备管理。首先简要介绍配电网络的特点和面向对象的分析方法,然后结合面向对象的分析与设计方法对配电网络的对象模型和数据组织进行了详细阐述和分析,最后以一个应用系统作为实例结束本文。     

南方鲇(Silurus meridionalis)幼鱼日粮中适宜常量营养素(蛋白质、脂肪和碳水化合物)需求量研究

采用混合试验中的Cornell均匀设计法研究了初始重为(2.0±0.0)g的南方鲇(Silurus meridionalis)幼鱼日粮中常量营养素(蛋白质、脂肪和碳水化合物)的适宜需求量。日粮中蛋白质、脂肪和碳水化合物梯度变化范围分别为33%—51%、3%—18%和24%—33%, 试验周期为40d。试验结果表明, 试验日粮中3种常量营养素含量对南方鲇幼鱼成活率没有显著影响(P>0.05)。当日粮蛋白质水平≤45%时, 其特定生长率随着日粮蛋白质水平上升而增加。当日粮脂肪水平≤9%时, 其特定生长率随着日粮脂肪水平上升而增加; 但当日粮中脂肪含量≥12%时, 鱼体和肝脏脂肪含量显著上升, 肝细胞脂肪变性明显。33%碳水化合物日粮组鱼特定生长率较24%、27%和30%组鱼显著降低, 同时鱼体和肝脏糖原含量显著增加(P<0.05)。试验表明, 南方鲇幼鱼日粮蛋白质、脂肪和碳水化合物3种常量营养素的适宜需求量分别为45%、9%和≤30%。日粮总能约为19.0kJ/g。     

Parametric analysis of single pile response in laterally spreading ground

Extensive damage to pile-supported structures has been witnessed in several recent earthquakes (Chi-Chi, 1999; Kobe, 1995, etc.), as a result of liquefaction-induced lateral spreading of slightly sloping ground or free-face topographic irregularities. This paper presents a parametric analysis of the basic pile and soil parameters, as well as the pile-soil interaction mechanisms affecting the response of single piles subjected to such lateral spreading, based on numerical simulation with the nonlinear P-y method. In parallel, a set of design charts and analytical relations is established, for approximate computation of maximum pile deflections and bending moments, using a “theory guided” multi-variable statistical analysis of the numerical predictions. Three different combinations (design cases) of pile head constraints and soil conditions were considered, which are commonly encountered in practice. The overall accuracy of the proposed analytical relations is evaluated against experimental results from seven centrifuge and five large shaking table experiments.