Accurate measurement of capture cross sections in deep level transient spectroscopy: Application to EL2 in GaAs

A rigorous formulation of capacitance changes during trap filling processes is presented and used to accurately determine the electron capture cross section of EL2 in GaAs at a particular temperature, 377K, in this case. The value, σ_n (377K) = 2.7 × 10⁻¹⁶ cm², is compared with that predicted from the emission dependence.     

利用多变量控制器实现常压塔塔底液位控制

塔底液位控制在石油化工装置中非常普遍 ,大多数情况下 ,用于调节塔底液位的抽出量又是下一道工序的进料 ,所以需要采用均匀控制的思想来保证既维持塔底液位在一定的允许范围波动 ,又尽可能减少对下游工序的影响。现介绍了采用多变量预估控制器实现上述控制思想的方法 ,该方案在兰州石化公司炼油厂二套常减压装置得到了成功的应用     

Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas

Ohne Zusammenfassung

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Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas

     

电子式互感器在数字化变电站的应用

电子式互感器和合并单元作为数字化变电站的重要组成部分，与传统互感器相比具有绝缘简单、动态范围宽、抗饱和性能强、占地面积小、实现数据输出等优点。文中介绍了有源和无源电子式互感器的构成，对这2种方式进行了比较，介绍了合并单元的功能及其应用，对工程应用提出了互感器配置和功能应用的实施建议。     

Intercardinal面上最大副瓣电平的分析方法

对天线方向图计算中涉及的最大副瓣电平的分析方法进行了探讨，提出了用方向图搜索求解最大副瓣电平；同时给出了用该方法求得在同相矩形口径两种分布形式下Ｉｎｔｅｒｃａｒｄｉｎａｌ面上的最大副瓣电子平，并给出了Ｉｎｔｅｒｃａｒｄｉｎａｌ面的定义。     

基于HLA的水中兵器仿真系统框架

为了解决我国水中兵器传统的仿真系统,局限于某些参数的数学仿真和部分半实物仿真,没有实现系统化、可视化,实时化,文章提出一种采用高层体系结构（HLA）作为分布交互的仿真体系框架,通过对水中兵器对抗系统仿真建模,解决了不同仿真应用之间的集成问题,较好地满足仿真系统的可视化、可操作性、强实时性及强交互性等要求。该仿真系统可以为水中兵器作战研究和武器装备论证提供仿真试验环境,检验装备各项战略战术指标,并为装备研制和战略战术决策提供依据,具有很高的实用价值。     

A variational method for contour tracking via covariance matching

This paper presents a novel formulation for contour tracking.We model the second-order statistics of image regions and perform covariance matching under the variational level set framework.Specifically,covariance matrix is adopted as a visual object representation for partial differential equation(PDE) based contour tracking.Log-Euclidean calculus is used as a covariance distance metric instead of Euclidean distance which is unsuitable for measuring the similarities between covariance matrices,because the matrices typically lie on a non-Euclidean manifold.A novel image energy functional is formulated by minimizing the distance metric between the candidate object region and a given template,and maximizing the one between the background region and the template.The corresponding gradient flow is then derived according to a variational approach,enabling partial differential equations(PDEs) based contour tracking.Experiments on several challenging sequences prove the validity of the proposed method.     

汽轮机凝汽器液位自调优化改造方案

某公司热电联供50MW汽轮发电机组凝汽器液位自调原设计只用化学补充水进行调节,但经实际运行结果验证此方案不能有效控制液位,经改造在凝结水泵出口加调节阀进行控制,取得了良好效果。重点介绍了3种方案的优化选择。     

电力变压器蒸发冷却装置FC液位监控系统

介绍电力变压器蒸发冷却装置的液位控制系统,该系统以嵌入式以太网芯片为核心构成网络终端,实现了冷却介质FC液位的远程监测调节。