天生桥梯级水电站联合调度决策支持系统建设经验

决策支持系统是水库优化调度实用化的发展方向，对于提高水电站生产效益和水库调度管理水平具有重要意义。结合国电公司重点科技项目“天生桥梯级水电站联合调度决策支持系统”的开发，阐述了开发水电调度决策支持系统实现水库调度实用化的经验:正确反映用户需求、增强用户对系统的控制、用模拟仿真弥补优化调度的不足、用数据库技术扩展水库优化调度实用化功能。     

宜兴抽水蓄能电站环保及水土保持工程的综合利用

介绍了宜兴抽水蓄能电站建设过程中对环保及水土保持工程综合利用的做法.项目利用实施4#拦渣坝环保及水土保持工程,根据所处区域的地形、地貌,通过对4#拦渣坝的设计优化,不但使其具有拦挡冲沟的泥沙进入下水库的功能,又利用改进坝型形成一定供水能力的小水库解决了可以提供符合标准的生活用水的难题,从而提升了4#拦渣坝的复合功能,实现了该电站环保及水土保持工程的综合利用.     

Bullwhip reduction for ARMA demand: The proportional order-up-to policy versus the full-state-feedback policy

A ‘proportional’ order-up-to policy reacting to ARMA demand is analyzed using stochastic optimal control theory. This policy is compared with a full-state-feedback order-up-to policy. Necessary conditions for an optimum of a weighted sum of the inventory and the ordering variances for both policies are formulated. Based on this a relatively simple expression for the ‘full-state’ policy is derived. The comparison between the two policies demonstrates that the ‘intuitively’ designed proportional policy does not fulfill the objective of controlling both the inventory and ordering variance for all parameter values of the demand model as well as the full-state-feedback policy. The full-state-feedback policy outperforms the proportional policy in several aspects.     

长治市水资源优化配置及对策

文中介绍了长治市水资源的特点和水资源开发利用现状，并总结了长治市水资源开发利用中存在的问题。针对性地提出了合理配置水资源、建设节水型社会、开发新水源、建立高效运行管理体制、运用市场经济机制以及改革现行的水价政策等一系列措施．从而实现全市水资源的优化配置和合理使用，促进全市经济的全面发展。     

Green Tax Reforms and Computational Economics A Do-it-yourself Approach

The double or even triple dividend hypothesis of green tax reforms has beena major issue of dispute in both the scientific community and the politicalarena during the last decade. Theoretical analysis has provided a number ofimportant qualitative insights to the debate but lacks of actual policyrelevance due to very restrictive assumptions. Applied research that takes thestep from stylized analytical to complex numerical models usually comes as ablackbox to non-expert modelers. This paper aims at bridging the gap betweenstylized theoretical work and numerical analysis. We develop a flexible,interactive simulation model which is accessible underhttp://brw.zew.de. Users can specify their own green tax reforms andevaluate the induced economic and environmental effects. Based on illustrativesimulations, we demonstrate the usefulness of our do-it-yourself approach fora better understanding of the double (triple) dividend hypothesis.     

ROI-based Watermarking Scheme for JPEG 2000

A new region of interest (ROI)-based watermarking method for JPEG 2000 is presented. The watermark is embedded into the host image based on the characteristics of the ROI to protect rights to the images. This scheme integrates the watermarking process with JPEG 2000 compression procedures. Experimental results have demonstrated that the proposed watermark technique successfully survives JPEG 2000 compression, progressive transmission, and principal attacks.     

Evaluation codes at singular points of algebraic differential equations

We use the special geometry of singular points of algebraic differential equations on the affine plane over finite fields to study the main features and parameters of error correcting codes giving by evaluating functions at sets of singular points. In particular, one gets new methods to construct codes with designed minimum distance. This work was partially supported by MCyT BFM2001-2251.     

纯相位空间光调制器动态控制光束偏转

提出并设计了一个采用液晶空间光调制器(LCSLM)作为光束动态偏转器件的无机械光束扫描系统,实现了光束的方向和强度的可编程控制,解决了远场任意图形的激光光束动态逼近问题。逼近方法采用纯相位调制技术和傅里叶迭代优化算法结合的衍射图形相位优化设计方法。介绍了点阵图形发生原理并给出实验装置图。实验结果显示,用该方法产生的二维阵列式光束,其光斑强度偏差度小于8%,图形发生响应时间小于100 ms,该实验结果能够满足多光束准确动态偏转的要求。该系统具有精确、响应快、无机械惰性等特点,在激光寻的、制导以及多目标威胁预警和反击中有着重要的研究价值。     

一种按时间切换的最速控制方法

基于初始状态空间下的子空间概念，提出了一种按时间进行切换的最速控制方法，不需要求取开关线或开关面。数字仿真结果表明，采用这一方法是完全可行的。