Evaluation of Fully-Integrated Switching Regulators for CMOS Process Technologies

This paper presents a feasible study of fully-integrated switching voltage regulators for power-optimized systems-on-chip (SoCs). In order to evaluate the power efficiency across a number of design variables, a compact macro-model of a regulator is created and validated. A key focus of the study is on the characteristics of the active and passive devices that are needed in order to maximize the efficiency of an on-chip regulator. With the macro-model, geometric programming is used to find the optimal characteristics for a given set of constraints such as load condition, process technology, and area. The achievable efficiencies for various current loads and across a range of technologies from 0.35-mum to 90-nm CMOS process are analyzed. The power efficiency is found to be strongly dependent on the inductor technology and over 70% efficiency is possible with advanced inductor technologies.     

AVO反演预处理中的检波器非径向接收能量补偿.

 在地震勘探中，当炮检距非零时，检波器接收方向与反射波传播方向的夹角是非零的（即非径向接收），这一非零夹角必将产生能量损失，进而对AVO反演产生显著影响。为此本文根据Snell定律导出非径向损失补偿公式，以模型实例讨论了非径向接收对反射系数的影响，并提出了一种简单而有效的非径向能量损失补偿方法。对比用该方法做非径向损失补偿前后的AVO反演结果，其差异显著，说明本文方法能够明显改善AVO反演的质量。     

Uncertainty Matters: Computer Models at the Science–Policy Interface

The use of computer models offers a general and flexible framework that can help to deal with some of the complexities and difficulties associated with the development of water management plans as prescribed by the Water Framework Directive. However, despite the advantages modelling presents, the integration of information derived from models into policy is far away from being trivial or the norm. Part of the difficulties of this integration is rooted in the lack of confidence policy makers have on the incorporation of modelling information into policy formulation. In this paper we examine the reasons for this apparent lack of confidence and explore how some tools, presently in use, address this problem. We conclude that public confidence in models is highly dependent on the way uncertainties are addressed and suggest possible directions of action to improve the current situation. Four real case studies illustrate how computer models have been used in The Netherlands for carrying out management plans at regional and national scale. We suggest that the solution to integrate modelling information into policy formulation lies on both the modelling and the policy-making communities.     

水布垭工程设计中的关键技术研究与创新

水布垭工程地处灰岩狭谷河段,大坝高233m,为目前世界上最高的面板堆石坝;地下电站位于软硬相间的层状岩体中;溢洪道最大泄洪功率3.1万MW,消能区岩体以软岩为主。围绕水布垭工程中的技术难题,经过国家＂九五＂科技攻关、工程前期科研和建设过程中大量的专题研究,取得了一批创新性成果并成功应用于工程实践。     

带式输送机盘式制动器温升分析

基于三维循环对称有限元模型,提出了带式输送机盘式制动器制动过程中温度场计算方法。讨论边界条件和各种相关参数的确定方法,以及输送机制动过程热流载荷的计算方法。仿真结果表明:在制动开始阶段,制动盘迅速升温,高温区集中在制动盘摩擦面表层。仿真结果与实验数据相符。     

聊城市防汛抗旱信息管理系统研究与应用

自2000年以来,聊城市水利局与河海大学合作,以GIS地理信息系统为平台,共同开发了聊城市防汛抗旱信息管理系统,其主要目标是为防汛抗旱决策和日常管理提供定量和定性的数据信息支持。     

龙滩水电站地下引水发电系统混凝土施工技术浅析

龙滩水电站地下引水发电系统混凝土工程具有规模大、结构体形复杂、质量要求高等特点,在混凝土施工过程中,采用了斜竖井全断面滑模技术、免装修混凝土施工技术、蜗壳混凝土浇筑技术、隧洞底拱翻模技术、特大型断面边顶拱混凝土衬砌施工技术等,这些技术的应用较好地完成了混凝土施工。     

新形势下的钻井信息化

介绍了我国石油行业在新的发展形势和管理模式下，钻井领域进行信息化的重要任务。在理清钻井业务流程的基础上，提出了以“钻井数据中心”为核心的钻井信息系统框架。从自动采集和人工采集两个方面阐明了钻井数据采集的范围和方式；从井筒网络、井场局域网、远程传输网和企业网等方面介绍了钻井信息化立体网络的构成，还介绍了钻井数据与甲方数据中心的数据交换方式、钻井数据中心的构建方法、以及钻井数据中心所支持的上层应用系统设计内容。提出了钻井信息化的发展方向，对我国钻井行业信息化有一定的指导意义。     

基于混合PSO算法的梯级水库优化调度研究

提出基于混合粒子群优化（PSO）算法求解流域梯级单目标优化调度问题方法的一般结构，并对三峡梯级的发电和洪水优化调度问题进行了研究。该算法利用离散微分动态规划法（DDDP）算法对粒子群优化算法的gBest粒子进行二次寻优，加快了算法的收敛速度和精度。