Study of the circulation theory of the cooling system in vertical evaporative cooling generator

The evaporative cooling system is the most important part differing from other tradi- tional cooling generator, and its design directly determines the evaporative generator’s performance[1]. The circle method is Close-Loop-Self-Cycle with no pump by making full use of its vertical structure, and stator bars are cooled by coolant’s potential heat. Evaporative cooling system does not need additional machines. The apparatus is simpler and work noise is reduced much. The work reliability is im…     

Estimation of forest volumes by integrating Landsat TM imagery and forest inventory data

Accurate information about forest volumes is essential for forest management planning. The survey interval of the Forest Resource Inventory of China (FRIC) is too long to meet the demand for timely decision-making required for forest protection, management, and utilization. Analysis of satellite imagery provides good potential for more frequent reporting of forest parameters. In this study, we describe an application of the k-nearest neighbors (kNN) method to Landsat TM imagery for improving estimation of forest volumes. Several spectral features were tested and compared in forest volume estimations, including normalized difference vegetation index, environmental vegetation index, and the combination of the spectral features. The combined index resulted in the most accurate volume estimations. The kNN estimator and the combined index were then used in forest volume estimation. The estimation error (RMSE) of the total volume was 44.2%, much lower than those for Larix forest (the RMSE was 51.7%) and those for the Korean pine and broadleaved forests (the estimation errors were over 71.7% and 88.19%, respectively). This preliminary study demonstrates the potential of forest volume estimations with remote sensing data to provide useful information for forest management if only limited ground information is available.     

Configurable Enterprise:A New Trend in Manufacturing Enterprise Evolution

Along with the popularity of enterprise applications,the management reform of manufacturing enterprise(ME) relies on the business process reengineering is gradually invalid.Reviewing and comparison the former structure of different enter- prise such as extend enterprise,virtual enterprise etc.from the perspective of link,unit,and focus.Through comparison the evo- lution of ME structure the configurable enterprise(CE)was put forward which based on the information and communication tech- nology providing a new mechanism for the elements configuration and the resources allocation.Based on the reference model of en- terprise business architecture,the framework of CE was raised,which includes enterprise business architecture,business model and component.Then modeling the dynamics of CE,the mechanism of key success factors interactions was analyzed and verified the key factors that de decided the evolution of CE which could forecast the development trend of manufacturing enterprise.     

Configurable Enterprise: A New Trend in Manufacturing Enterprise Evolution

Along with the popularity of enterprise applications, the management reform of manufacturing enterprise (ME) relies on the business process reengineering is gradually invalid. Reviewing and comparison the former structure of different enterprise such as extend enterprise, virtual enterprise etc. from the perspective of link, unit, and focus. Through comparison the evolution of ME structure the configurable enterprise (CE) was put forward which based on the information and communication technology providing a new mechanism for the elements configuration and the resources allocation. Based on the reference model of enterprise business architecture, the framework of CE was raised, which includes enterprise business architecture, business model and component. Then modeling the dynamics of CE, the mechanism of key success factors interactions was analyzed and verified the key factors that de decided the evolution of CE which could forecast the development trend of manufacturing enterprise.     

建立系统、规范的电网事故预想制度的思考

电网调度管理的基本任务之一是指导电力系统安全运行和事故处理，保证所管辖电网的可靠运行和连续供电。重点阐述了建立规范、系统的事故预想制度的三个步骤，做到未雨绸缪，保证电网的安全可靠运行。     

粒子群优化算法在配电网网架优化规划中的应用

粒子群优化(PSO)算法已经成功地用于求解连续域问题,但是对于离散域问题的求解研究还很少。文中使用模糊离散粒子群优化算法,用于求解配电网网架优化问题。采用模糊矩阵表示粒子的位置和速度。为了处理配电网辐射性结构的约束条件,引入了图论中的最小生成树问题。最后对算例进行测试,检验该方法的有效性及应用效果。     

高校引进人才“弃档”现象的原因与对策

1998年以来,我国高等教育经过大规模的扩招,以超常规、跳跃式的速度进入大众化教育阶段。高校大力引进人才的同时,人事档案管理方面也出现了一些问题。文章对高校引进人才“弃档”现象进行分析,找出了这个现象产生的原因,提出了解决问题的对策。     

X射线线扫描安全检查设备实时信号处理

针对X射线在成像过程中存在的非均匀性，利用两点校正法设计了用于X射线安全检查设备的增益和偏移补偿电路；完成了线扫描X射线安全检查设备的数据信号处理硬件模块，给出了电路结构框图；电路采用DSP＋CPLD的结构，在模拟部分和数字部分两次校正，得到了校正前后的处理结果，实现了工程应用。     

传输网络的分层故障定位法

文章提出一种用于通信的故障定位方法,该方法克服了传统的故障定位方法适用范围窄和实现复杂的缺陷.采用分层的故障定位方法,同时采用逻辑分析和归纳的方法,可以把复杂的故障定位问题转化为一个个容易处理的子问题.此外,在各个层面还给网管人员留有修改和加载的权限,不仅实现灵活,而且适用性强.该方法已申报国家发明专利,并用于实际系统中.     

脉冲强磁场探测系统的基本实现

简要介绍了电磁感应法测量脉冲强磁场的原理,并对基于此原理的探测系统进行了实现,最后对实验结果予以分析,给出了主要误差来源.