FH4-060型高分辨堆积拒绝门

本文介绍一种用于快闪烁探测器能谱测量系统的堆积拒绝门,其分辨时间好于10ns。线路采用更新计时器,定时电容的更新时间包含在门宽度之内,原则上电路无死时间,输入计数率无上限,特别适用于高计数率的场合。电路内附反符合控制输入和门信号放大器,可实现对多道分析器的堆积拒绝和反符合控制。     

常规火焰原子吸收光谱法测定水中的痕量砷

利用砷、镉在 2 2 8.8nm波长处重叠谱线的光谱干扰效应 ,研究了砷、镉共存体系的干扰特点 ,采用均匀设计 ,数学方法和计算机技术进行数据处理 ,实现了用常规火焰原子吸收光谱法同时测定痕量砷和镉 ,其中测定砷的灵敏度可达 10ng/ml,利用该方法分析了水中的痕量砷 ,其结果令人满意。     

卧式搅拌釜搅拌功率的设计计算

在对一卧式搅拌釜搅拌功率的设计计算中，比较了各种功率计算方法，并与实测值进行对照。     

两种水轮发电机组开机控制技术的比较及优化

本文建立了水轮发电机组仿真模型,并以某电站的水流特性、机组惯性等实际参数作为仿真模型参数,着重研究水轮发电机组的两种开机控制规律,分析了原有以空载开度为限制的机组开机控制技术,提出以恒转速变化率为控制目标的机组开机控制技术,并将两种开机控制技术进行了仿真比较。通过仿真波形分析比较表明,两种开机控制技术各自具有的优越动态性能。在工程实践中,将这两种开机控制技术都应用到水轮机调速器开机程序中,可以根据水电站现场对开机动态性能的不同要求在停机态切换两种开机控制流程。     

太湖流域水灾害应急对策研究

太湖流域是我国经济社会高度发达的地区之一,发生水灾害时往往会造成重大经济损失。对发生各类水灾害时的应急对策展开研究总结,以减轻水灾害,避免人员伤亡,保障经济社会可持续健康稳定发展,并通过分析典型案例的实际应对过程,为今后开展类似工作提供参考。     

析一起 LFX-912收发信机频繁发信现象

文章对新线路启动中LFX-912收发信机频繁发信现象进行分析,找出了具体原因,逐步处理,消除了频繁发信现象,并提出防范措施和详细处理步骤。     

Application of BP Neural Network in Prediction of Cu-Pb Composite Plates Properties

Abstract： The artificial neural networks（ANN） , which have broad application, are proposed to develop Cu-Pb composite plates materials. Based on the back propagation（BP） algorithm of the forward muhilayer perceptron, the model to predict the shear stress under different ingredient of the third element and the hot dipping temperature for Cu-Pb composite plates are established. Then the relational model among the third element, hot dipping temperature and shear stress by using the limited data are studied, and the forecast average error is 4%. This model can satisfy the requirements of the precision of forecast in the project experiment process. The results show that the corresponding shear stress is greater when the third element in the element contains more Sn; the most appropriate temperature of hot-dip plating about is 340℃, ＇after predicted with lead/the third element/the best performance of copper composite material element of the third group is the one-element Sn, hot dip plating temperature is 335 ℃ ; two-element is 90% Sn 10% Bi, and hot dip plating temperature is 345 ℃. The prediction results can be used for a reference in instructing the further experimental design.     

基于状态观测器的一类不确定性线性系统鲁棒保性能控制器设计

针对一类范数有界和具有外界干扰的状态不可测的线性系统,提出了一种根据观测器的鲁棒保性能控制器的设计方法.通过利用Lyapunov稳定性原理和H∞理论,可以得出鲁棒保性能控制器存在的一个充分条件.所设计的控制器不仅能保证闭环系统的稳定性,而且也能保证闭环系统具有一定的线性二次性能指标和H∞性能指标.利用仿真研究,得出所提方法的有效性.     

Accurate mirror-based camera pose estimation with explicit geometric meanings

An accurate closed form solution is proposed to estimate camera pose by several mirrored reference object images acquired via a planar mirror under different unknown poses. Compared with state-of-the-art methods, our method is more accurate when there are more than three images and has explicit geometric meanings. This method also properly handles cases in which some of the mirror poses are parallel. The central idea is to minimize an error metric based on all reflections of rotation, which enables the camera rotation to be estimated directly by SVD of sum of mirrored camera rotations. After that, the camera translation is computed by solving a large system of linear equations to minimize object space collinearity error. Both synthesized data and real data experiments show the advantages of our approach.