甚小孔径卫星（VSAT）的数据传输应用

简单分析了甚小孔径卫星通信的技术特点和优缺点。重点讨论用它来解决数据传输问题,通过举例对目前采用ＶＳＡＴ卫星通信解决数据传输问题的技术做进一步的讨论。     

Globally stable adaptive robust tracking control using RBF neural networks as feedforward compensators

In previous adaptive neural network control schemes, neural networks are usually used as feedback compensators. So, only semi-globally uniformly ultimate boundedness of closed-loop systems can be guaranteed, and no methods are given to determine the neural network approximation domain. However, in this paper, it is showed that if neural networks are used as feedforward compensators instead of feedback ones, then we can ensure the globally uniformly ultimate boundedness of closed-loop systems and determine the neural network approximation domain via the bound of known reference signals. It should be pointed out that this domain is very important for designing the neural network structure, for example, it directly determines the choice of the centers of radial basis function neural networks. Simulation examples are given to illustrate the effectiveness of the proposed control approaches.     

装甲车车身自动调平系统原理及算法设计

为了提高6点装甲车辆调平的快速性和稳定性,根据装甲车结构,考虑响应时间、速度和可靠性等综合因素,将车身系统由6点调平系统等效为4点调平系统。利用相应的角度和压力传感器检测车架的水平状态,以确定油气簧的动作量。采用双速调整的方法计算比例阀门的开启大小及时间,运用西门子控制器实现对调平系统的控制。试验结果表明,该系统具有较高的快速性和稳定性。     

稀磁半导体CoTiO2薄膜结构和磁性研究

通过对靶磁控反应溅射法和原位退火工艺制备了系列CoTiO2薄膜样品.研究发现,掺杂量对薄膜的磁性和结构有很大的影响.通过X射线衍射仪和振动样品磁强计对样品的结构和磁性进行了分析,发现制备的样品中较少的掺杂显示明显的室温铁磁性并且没有Co金属存在,但是随着掺杂的增加,部分Co以微小的颗粒存在,而且在超顺磁极限之下,使薄膜的磁性受到超顺磁相的影响.     

PCB自动光学检测中Gerber文件的解析研究

为了在PCB自动光学检测中使用Gerber文件建立标准图像,提出了一种解析Gerber文件的方法.该方法在对Gerber文件的数据结构进行语法分析的基础上,采用正则表达式匹配,进行自上而下分析从而提取出所需信息,用Map内嵌链表的数据结构存储数据;然后计算出Gerber文件所描述的图像并通过图形设备接口绘制;最后将各层图像进行腐蚀膨胀等处理并合成适用于PCB自动光学检测建标的图像.实验结果表明,该方法能快速准确地解析Gerber文件.     

Improved optimization methods for refinery hydrogen network and their applications

Heavier market competition and tighter environmental legislation lead to the increasing demand for hydrogen in refinery. Hence it is necessary for refinery to seek effective hydrogen management strategies to satisfy the increasing hydrogen requirements. In this paper, two improved systematic mathematical methods are developed based on two-step approach and simultaneous optimization approach respectively to retrofit the hydrogen network in refinery. To make the proposed approaches more suitable for real systems, the flowrate and purity at the reactor inlet of hydrogen consumers and the hydrogen recovery of purification units are considered as variables, and the minimum pure hydrogen of hydrogen consumers must be satisfied. Then the corresponding optimization problem is mathematically transformed to a mixed-integer nonlinear programming (MINLP) problem. However, solving a MINLP model directly will result in inconsistency in solution quality and time. In this paper, the solving of the complex MINLP formulation is avoided by using a mixed-integer linear programming (MILP) linearization technique, resulting in better quality, stability, and efficiency than solving the MINLP model directly. The proposed approaches in this paper could make the best use of resources and consequently provide significant environmental and economic benefits for refinery. A real case study is presented to illustrate the applicability of the proposed approaches.     

基于优化RANSAC算法的二次元快速稳定配准

针对检测零件缺陷的二次元光电检测仪的速度和稳定性要求,提出了一种加入预匹配的快速稳定的RASNSAC匹配方法.首先对零件图像轮廓区域矩分析以及轮廓多边形逼近以及对其CAD标准档进行解析计算得到图像轮廓和CAD图的重心、主轴方向以及特征点集,然后通过重心和主轴对零件图像和CAD图进行预匹配,最后利用RANSAC对预匹配后的特征点集进行快速匹配.实验结果表明,此改进算法显著地提高了图像的匹配速度和稳定性.     

30种多氯有机物的沉积物吸附系数定量结构性质关系研究

研究了30种含氯有机物沉积物吸附系数(Koc)的定量结构性质关系(QSPR)模型。模型的自变量由遗传算法从多个结构描述符中选择得到,校正模型则采用多元线性回归方法建立。应用留一交叉验证及外部测试集验证对所建立的模型进行了检验。留一交叉验证中模型的预测均方相对误差为8.13,外部测试集验证中模型的预测均方相对误差为8.88。这说明所建立模型对于未知样本有较好的预测能力,可用于预测含氯有机物的Koc值;遗传算法结合多元线性回归方法是一种合理可行的建立含氯有机物沉积物吸附系数QSPR模型的方法。     

新型多路高低压发射器设计分析

根据新型多路高低压微抛射系统的结构特点,采用经典弹道理论建立了高低压发射方式的内外弹道数学模型,从理论上对新型高低压微抛射系统的结构设计的合理性进行了数值分析.对高低压发射系统的膛压及弹丸发射初速进行了测试.试验结果表明,所建立的多路高低压微抛射系统的分析方法和设计方法合理、可靠.