微风细雨:都江堰虹口香溪堂设计随笔

<正>都江堰虹口距成都市约80km,因避暑及漂流而成为成都的旅游胜地,生态旅游中心选址于虹口风景区深溪沟。项目分两期,一期为深溪沟接待点,由香溪行馆(别墅区)和香溪堂(服务配套建筑,190m~2)组成,二期为虹口旅游服务中心及酒店。香溪堂作为接待、休闲之用,规模很小,功能简单,但业主极为重视,把它作为二期启动前的形象展示,希望设计理念先进,独具个性。业主于2007年10月正式委托我们设计一期工程,原计划2008年6月动工。5月12日突如其来的汶川大地     

地下工程抗浮加固设计

地下工程的抗浮设计非常重要,往往决定着工程的成败。本文所述案例由于原设计未充分考虑地下水的影响而致使事故的发生。笔者通过对事故现象的分析,找出了造成事故原因,从而采取经济合理的加固方案使该工程达到了较为满意的经济和社会效益。     

弯剪作用下建筑物单桩桩基计算方法初探

本文通过分析弯剪作用下的建筑桩基的水平承载力计算的规范方法及支护结构中的挡土桩的计算方法和对弯剪作用下建筑桩基的受力状态的定性分析,给出了该种工况下的单桩计算的建议模型供同仁参考指正。     

基于FPGA的超高分辨率监视器设计与实现

为满足工业、农业、交通等领域对输出大尺寸图像的高分辨率要求,立足于现有电子产品,采用拼接、分部显示等技术,设计出能够满足上述需求的监视器。阐述了监视器设计过程、硬件结构和逻辑结构,消除了近距离观看时的锯齿感,提高放大后画面的显示效果。     

Seeker optimization algorithm for global optimization: A case study on optimal modelling of proton exchange membrane fuel cell (PEMFC)

In order to optimize the proton exchange membrane fuel cell (PEMFC) model parameters, a novel approach based on seeker optimization algorithm (SOA) is proposed. The SOA is based on the concept of simulating human searching behaviors, where the choice of search direction is based on the empirical gradient by evaluating the response to the position changes and the decision of step length is based on uncertainty reasoning by using a simple Fuzzy rule. In this study, after evaluated on benchmark function optimization, the SOA is applied to optimal modelling of the PEMFC by using a fuel cell test system in Fuel Cell Application Centre (FAC) at the Temasek Polytechnic, and compared with several state-of-the-art versions of differential evolution (DE) and particle swarm optimization (PSO) algorithms. The simulation results show that the proposed approach is superior to other compared algorithms, and the PEMFC model with optimized parameters by SOA fitted experimental data well. Hence, SOA is an effective and reliable technique for optimizing the parameters of PEMFC model, and can be helpful for system analysis, optimization design and real-time control of the PEMFCs.     

可变速风力发电系统综述

介绍风力发电的发展状况,分析了风力发电的技术动态,说明可变速发电方式和风车大型化的优点。详述同步发电机配备大功率变频装置和双重励磁绕线式转子异步发电机配备电力变换装置的两种方式。今后风力发电将始终围绕着降低成本、提高系统稳定性和可靠性这几个要点,得到广泛应用,成为对国民经济有着举足轻重影响的产业。     

Triangle-based key management scheme for wireless sensor networks

For security services in wireless sensor networks, key management is a fundamental building block. In this article, we propose a triangle-based key predistribution approach and show that it can improve the effectiveness of key management in wireless sensor networks. This is achieved by using the bivariate polynomial in a triangle deployment system based on deployment information about expected locations of the sensor nodes. The analysis indicates that this scheme can achieve higher probability of both direct key establishment and indirect key establishment. On the other hand, the security analysis shows that its security against node capture would increase with a decrease of the sensor node deployment density and size of the deployment model and an increase of the polynomial degree.     

基于ControlLogix PLC的水利工程自动化系统

简要介绍了水利工程信息自动化系统原理与结构.研讨罗克韦尔ControlLogix系列PLC的功能特性及其在水利工程信息自动化系统中的应用。     

高性能InGaAs/AlAs共振隧穿二极管的研制与器件模拟分析

在半绝缘的InP衬底上采用分子束外延的方法生长制备了不同势垒厚度的RTD材料样品,室温下测量的最高峰-谷电流比为18.39.通过模拟得到RTD直流特性与势垒厚度、势阱材料及厚度、隔离层厚度以及掺杂浓度间的关系,对结果进行了分析与讨论.     

最小化拖期任务数并行机调度问题的一种基于知识的遗传算法

本文研究了最小化拖期任务数并行调度问题,提出了一种基于知识的遗传算法,并在问题的描述、遗传算法编码、初始种群的产生办法、交叉方法、变异方法等方面作了研究,不同规模问题的数值计算结果表明了本文提出的基于知识的遗传算法优于目前为止最好的启发式算法和普通的遗传算法,并且能适应于较大规模的并行机调度问题。