赵口—黑岗口河段河势演变及工程适应性分析

在统计不同时段赵口—黑岗口河段河湾要素的基础上,分析了规划流路与实际流路河湾要素之间的相互关系,从河床比降、弯道半径、河湾中心角、直河段河长等方面分析了河势演变情况及已建工程对河势流路的适应性。结果表明:规划流路与实际流路趋向匹配;多数工程河湾半径设计较为合理,但部分工程设计弯道中心角较大,不利于控制主流;建议结合工程实际情况采取一定的工程措施,进一步完善原有的整治方案,增强对河势的控制能力。     

均值黄金分割离差双选优化模型研究

在提出黄金分割离差的基础上,构建了均值黄金离差双选优化模型。在评价指标数目从少到多的过程中,评价指标体系将呈现由劣变优再变劣的过程,这个规律符合黄金分割律的应用。以岳阳石化企业节约用水考核为例,优化了岳阳石化企业节约用水考核指标体系,结果显示优化后的指标体系科学性、合理性与可操作性较强。     

枕头坝一级水电站工程枢纽布置设计

枕头坝一级水电站枢纽由挡水、泄水、电站等建筑物组成。施工导流方式和导流建筑物与泄洪建筑物的结合是枢纽布置的关键问题。结合地形地质条件及各建筑物的结构特点,并考虑枢纽布置、泄洪消能条件、施工条件、经济、安全等要素,重点介绍了枕头坝一级水电站首部枢纽布置设计及比选过程。经过分析论证,最终选择了左岸引水发电建筑物+右岸5孔泄洪闸（其中3孔位于导流明渠内）的枢纽布置方案。     

抽水蓄能电站的选点原则

兴建抽水蓄能电站是满足电网调峰需求的一个最佳途径,它具有调峰灵活、经济、安全稳定等优点.抽水蓄能电站选点要兼顾水源、水头、坝高、距高比、地理位置和地质等条件较优的原则.     

缅甸敏达水电站厂房设计

结合缅甸敏达水电站地形地质条件,从厂址比选、开关站型式比选和厂房布置等几个方面介绍了该水电站厂房设计的基本思路及设计要点。     

岔溪河一级水电站坝址比选设计

岔溪河一级水电站为岔溪河干流上水电开发的第一个梯级电站,为岔溪河水电开发的龙头水库。岔溪河一级水电站上坝址选择混凝土面板堆石坝作为代表坝型,下坝址选择细石混凝土砌石重力坝作为代表坝型。     

海南省海口市龙塘镇至龙泉镇防洪堤结构型式比选

对于部分江河的洪泛区,尤其是在一些无任何防洪排涝设施的地区。汛期如遇一般性洪水,则该地区的大片农田及大部分村庄就会被浸淹。故在部分特殊江河地区的岸边修建防洪堤,对保护该地区的人民群众及其财产安全具有重要意义。以海南省海口市龙塘镇至龙泉镇防洪堤为例,对该段防洪堤型进行了方案比选,最终提出钢筋混凝土防洪墙与土堤结合的防洪堤型式为最优最合理的设计方案。     

庄里水库坝址及坝轴线方案比选

水库工程大坝坝址坝轴线的选择,是项目可行性研究阶段的主要研究课题,在满足规划指标及枢纽布置等条件下,还应充分考虑工程地质条件、施工工期、移民拆迁占地、环境影响、工程投资、工程效益等方面,最终选择技术可行、经济合理、效益最佳的方案作为推荐方案。所介绍的山东省庄里水库,在开展前期工作过程中,由于存在复杂的地质情况及移民拆迁占地问题,在坝址坝轴线的比选工作上经历了项目建议书及可行性研究两个阶段,勘察设计时间长达5a之久,最终确定上坝轴线为推荐方案。     

A review of: “Introduction A La Psychophysiologie Du Travail (Introduction to the Psychophysiology of Work)”, by ROBERT FLORU and JEAN-CLAUDE CNOCKAERT,Presses Universitaires De Nancy (1991). pp. vi + 233, FF 120, ISBN 2-86480-550-2.

Workers in physically demanding occupations (PDOs) are frequently subjected to physical selection tests. To avoid legal ramifications, workplaces must be able to show that any personnel selection procedures reflect the inherent requirements of the job. A job task analysis (JTA) is fundamental in determining the work tasks required for employees. To date, there are no published instructions guiding PDO researchers on how to conduct job task analyses. Job task analysis research for non-PDOs offers some insight into the expected reliability and validity of data obtained on the most prevalent task domains in job analysis (importance, frequency, time spent and difficulty). This review critiques such research, and the existing published material on JTA of PDOs, and provides recommendations for future research and practice.

Practitioner Summary: There are no published guidelines for physically demanding occupation (PDO) researchers conducting job task analysis (JTA). Given the legal consequences of improperly conducted JTA, scientifically valid instructions for JTA practitioners are required. This review critiques existing research which analyses reliabilities of JTA data, and provides guidelines for PDO researchers conducting JTA.     

Parameter identification of inertially stabilized platforms using current command design

Accurate parameter identification is essential when designing controllers for inertially stabilized platforms (ISPs). But traditional identification methods suffer from observation measurement noise and operating restrictions of ISPs. To address this issue, a novel identification method based on current command design and multilevel coordinate search (MCS) algorithm without any higher order measurement differentiations was proposed. The designed current commands were adopted to obtain parameter decoupled models with the platform operating under allowable conditions. MCS algorithm was employed to estimate the parameters based on parameter decoupled models. A comparison experiment between the proposed method and non-linear least square method was carried out and most of the relative errors of identified parameters obtained by the proposed method were below 10%. Simulation and experiment based on identified parameters were conducted. A velocity control structure was also developed with disturbance observer (DOB) for application in disturbance compensation control system of an ISP. Experimental results show that the control scheme based on the identified parameters with DOB has the best disturbance rejection performance. It reduces the peak to peak value (PPV) of velocity error integral to 0.8 mrad which is much smaller than the value (10 mrad) obtained by the single velocity controller without DOB. Compared with the control scheme based on sweep model with DOB compensation, the proposed control scheme improves the PPV of velocity error integral by 1.625 times.