园林专业测量实践教学改革的探讨

阐明了园林专业测量实践教学中存在的问题：课时矛盾突出,教学条件落后,教学手段与方式落后,考评体系不够完善;并为适应园林专业培养目标的需要,提高测量实践教学的效果,提出了相应的改革策略：精选与合理安排教学内容、积极改善教学条件、进行教学手段与方法的改革、建立与完善考评体系。     

Real-time hybrid experimental system with actuator delay compensation and its application to a piping system with energy absorber

A real-time hybrid experimental method, in which output from an actuator-excited vibration experiment and response calculation are combined on-line and conducted simultaneously in real time, is being developed as a new seismic experimental method for structural systems. In real-time hybrid experiments, however, there is an inevitable actuator-response delay, which has an effect equivalent to negative damping. To solve this problem, a real-time hybrid experimental system (including an actuator-delay compensation method) was developed. And seismic experiments were conducted in order to demonstrate the advantages of this system. Experimental results obtained using the developed hybrid experimental system were compared with exact results obtained using shaking-table experiments, and it was found that the two experimental methods gave almost identical results. It can therefore be concluded that the structural response can be obtained precisely by using the developed hybrid experimental system. Comparison of these experiments showed the advantages of the hybrid experiments; that is, they are simple and economical. This is because the hybrid experiment requires only a small structure as the excitation model, while a shaking-table experiment must consider the whole structural system. Copyright © 1999 John Wiley & Sons, Ltd.     

短期气候预测:南京信息工程大学60年回顾与展望

本文从科学发展角度回顾了国内外短期气候预测的发展历程;在此基础上,回顾了南京信息工程大学建校60 a来短期气候预测领域的团队建设及其在教学、科研和预测方面的实践,并展望其未来工作。     

混合模型试验等效水深截断系统优化设计研究

进行了深海海洋平台混合模型等效水深截断系统优化设计试验研究,优化方法选用混合离散变量模拟退火法,目标函数为截断系统和原系统的静力特性相似程度。以一个转塔式系泊浮式生产系统为例进行了等效水深截断系统优化设计计算。     

GIS在高校地图学教学改革中的应用研究

文章针对目前高校地图学教学中存在的弊端,深入分析原因并提出地图学教学改革观点。阐述了地理信息系统(GIS)与地图学之间的内在关系,认为利用地理信息系统这门新兴的前沿学科来辅助地图学教学具有充分的理论依据和现实意义。     

从市场需求看我国高校GIS教学改革

总结了GIS技术和高校GIS专业的发展,分析了GIS的学科特点和GIS教育的特点。进而在分析当前市场对GIS人才的需求状况及对GIS人才提出的要求的基础上,阐述了现有GIS教育存在的问题,从教学内容、教学方法、教学模式和考试方法等方面提出了GIS教学改革的一些设想。     

THE EFFECTS OF TIBETAN PLATEAU ON THE ANOMALOUS VARIATION OF ASIAN MONSOON IN A COUPLED OCEAN-ATMOSPHERE SYSTEM

Experimental predictions with a hybrid coupled ocean-atmosphere model(L9R15 AGCM-ZCocean model)were performed for the 1986/87 El Nino event and the 1988/89 La Nina event withand without the Tibetan Plateau respectively(called TP FORC and NTP FORC hereinafter).Comparison shows that,to some extent,the existence of the Tibetan Plateau orography weakensor restrains(strengthens or facilitates)the formation of the anomalous circulation of Asianmonsoon during El Nino(La Nina)period.Opposite results are found in the uncoupled AGCMsimulation.     

基础隔震建筑混合控制的变结构趋近律方法

本文对叠层胶支座基础震建筑的混合振动控制问题进行了研究。利用控制律设计的变结构趋近律方法,给出了相应的闭环控制律表示式。     

Online numerical simulation: A hybrid simulation method for incomplete boundary conditions

Hybrid simulation is a powerful and cost‐effective simulation technique to evaluate structural dynamic performance. However, it is sometimes rather difficult to guarantee all the boundaries on the physical substructures, especially when the boundary conditions are very complex, due to limited laboratory resources. Lacking of boundary conditions is bound to change the stress state of the structure and eventually result in an inaccurate evaluation of structural performance. A model updating‐based online numerical simulation method is proposed in this paper to tackle the problem of incomplete boundary conditions. In the proposed method, 2 sets of finite element models with the same constitutive model are set up for the overall analysis of the whole structure and the constitutive model parameter estimation of the physical substructure, respectively. The boundary conditions are naturally satisfied because the response is calculated from the overall structural model, and the accuracy is improved as the material constitutive parameters are updated. The effectiveness of the proposed method is validated via numerical simulations and actual hybrid tests on a RC frame structure, and the results show that the negative effect of incomplete boundary conditions is almost eliminated and the accuracy of hybrid simulation is very much improved.     

基于磁流变阻尼器与弹性基础隔震耦合建筑的地震响应分析

为了减少地震时相邻建筑间相互撞击造成严重的结构损坏,运用Lyapunov法作为控制算法进行稳定性分析和控制器设计,对半主动控制以及两种混合控制方案性能进行了对比分析,经过研究发现,混合控制策略在缓解地震响应方面比半主动控制更有效。选取适当的混合控制能够减少支座位移,从而有效防止冲击。另外,通过参数学习发现增加隔震阻尼和强度会导致基础剪力增加和支座位移减小,选择适当的参数值,能够保证响应限定在一定范围内。