好水川流域工程运行管理探讨

简要介绍了好水川流域的总概况,针对目前工程管理中存在的问题,提出了科学做好工程运行管理的具体措施及今后的管理方向。     

农家书屋“村校共建”模式探析

农家书屋建设即将实现全覆盖,＂管＂好＂用＂好是长期有效运行的关键。从创新管理方式着眼,以方法和策略解析来探讨农家书屋走出运行困境之路。     

江苏省农科院粮食作物研究所网站的构建与运行

基于江苏省农科院粮食作物研究所对外宣传和展示信息化的需求,选择构建该所的网站,对其功能、栏目、体系结构以及运行情况进行详细介绍。网站的实施将极大地提高粮食作物研究所的软实力,增强其综合竞争力。     

一次人工影响天气作业的增雨效果分析

随着科技水平的提高,人工影响天气作业作为防灾减灾的科学手段,其效果和效益越来越受人们关注。采用高炮或火箭向对流云或层状云中播撒碘化银,对云层中的水滴或冰粒子实施人工干预,进行静力催化和动力催化,促进和加速水滴或冰粒增长并下落,达到人工增雨抗旱的目的,其直接效益已得到一致公认。对2012年3月21日聊城市一次人工增雨抗旱作业的直接增雨效果进行了分析,初步得出在初春层状云中实施人工影响天气作业的效果十分明显。     

基于实时性的图像插值加速算法研究

插值算法在图像处理中扮演着重要角色,本文介绍了双线性播值的原理,分析了浮点运算对算法效率的制约,提出了通过把像素值放大一定倍数转换浮点运算为移位运算的算法加速方案,重点设计了插值加速算法,然后对加速算法的运行效率和图像质量进行了对比测试,证实了加速算法在保证图像质量的基础上提高了插值效率,可以在实时系统中广泛应用.     

电网全景化EMS的发展及展望

文章结合电网调度自动化系统发展历程、当前电网运行需求和新技术应用下,分析了传统EMS的局限性,包括缺乏新技术的兼容能力,系统固化、难于开发新功能等.文章重点介绍全景化EMS的组成及构架,全景化EMS通过可缩放矢量图形(SVG)、公共信息模型(CIM)、可扩展标记语言(XML),数据支持平台等技术,实现电力网全网源端的一...     

J-80A型轮式集材拖拉机的使用和操作方法

介绍了J-80A型轮式集材拖拉机的使用和操作方法.     

Effect of stand density and humus removal on regeneration of Pinus densiflora seedlings in a mixed conifer and broad-leaved forest

We studied the impact of stand density and forest floor humus removal on regeneration of Pinus densiflora in a mixed conifer and broad-leaved forest on the Daimonji-Yama Mountain,Kyoto,Japan.Three levels of stand density were set,i.e.,a clear-cut site,a heavily thinned site and a lightly thinned site.In each density treatment,comparisons were carried out between humus removal (A 0 -free)and humus intact(A 0 -intact)subplots.We counted the emergence of sown pine seeds and measured survival and growth of pine seedlings over the next four years.In addition,light conditions and the recovery of understory were monitored.Results show that thinning intensity and humus removal promoted the establishment and growth of seedlings.One exception,however,was that seedling growth was minimal in the heavily thinned A 0 -intact subplots.This was due to a strong response of understory vegetation growth on the treatment combination,which hindered the pine seedling growth.Furthermore,we found that the canopy openness measured at 1.3-m height remained at least 35%for the heavily thinned site in 2008.The results suggest that the removal of the A 0 layer after heavy thinning is the most effective and labor-saving operation for P.densiflora regeneration.     

灌区渠首水库群优化调度的自优化模拟技术

以梅院泥灌区为背景,建立了灌溉供水量最大为目标函数的灌区渠首水库群优化调度的自优化模拟模型及相应的求解技术。在利用历史资料进行优化计算的基础上,获得了梅院泥灌区渠首水库的调度规则。     

Application of multi-dimension parallel genetic algorithm to energy-saving optimum control of trains in following operation

In order to study the energy-saving optimum control strategy of a leading train and a tracing train in following operation under a moving block system,an energy-saving control model of trains is created. The aims of the model are energy consumption and trip time error. The control variables of this model are the operating handle level and the train’s position when the operating handle level is changed. Based on the model,the static and dynamic speed restraints are put forward. The static speed restraints are defined by the line conditions and the dynamic speed restraints of the tracing train caused by the leading train for the sake of safety. This problem is solved with the help of multi-dimension parallel genetic algorithm (GA) and external punishment function. During the solving process,the crossover probability and the mutation probability are adjusted dynamically according to the GA generation to improve the efficiency of the coarse grain search and the fine grain search. Ramps divided into three parts and the real number coding are adopted to shorten the length of chromosomes and improve the speed of convergence. Its correctness and effectiveness are validated at a simulation platform of train operation.