W18Cr4V高速钢激光相变强化层的残余应力

利用Ｘ射线衍射法对Ｗ１８Ｃｒ４Ｖ高速钢激光相变强化层的残余应力进行了测定和分析。试验结果表明，相变强化层表面的残余应力为压应力，内部为拉应力，近似按正弦函数分布。其大小和分布状态随工艺参数的变化而改变。当改变工艺参数使表面熔化时，表面为拉应力。     

V/Sb预合成粉对ZnO-V2O5基压敏电阻材料的影响

基于传统电子陶瓷合成工艺,采用二次合成法在950℃合成了组织均匀、瓷体相对密度＞98%、非线性系数＞50的ZnVSb基多组分压敏电阻陶瓷材料.Sb以V2O5/Sb2O3预合成粉的形式进行添加,避免了由于Sb2O3挥发造成的对ZnO晶粒生长的阻碍,促进了陶瓷的低温烧结.随着预合成粉含量的增加,Sb3+离子对Zn2+离子的取代量增加,材料内部VZn等受主型缺陷的增加,使晶界势垒升高,使材料获得优异电学非线性特性.     

三维CAD软件中二维工程图功能的扩展

文章以三维CAD软件Solid Edge为例,将Solid Edge二次开发技术与数据库等技术结合在一起开发了公差查询与标注软件、图页设定等软件,解决了其尺寸公差标注、标题栏设置、粗糙度标注等方面存在的问题,为三维CAD软件如何扩展二维工程图功能以及提高二维工程图设计效率提供了一条途径.     

百米磁场下降法测量埋地管道外涂层绝缘电阻技术

介绍了百米磁场下降法测量埋地管道外涂层绝缘电阻的技术，对施测手段、操作要点、计算方法及检测中应注意的问题进行了论述。     

Integrated Co-evolution Model of Land Use and Traffic Network Design

An integrated co-evolution model with the consideration of land use and traffic network design is proposed in this paper. In the suggested model, two kinds of economic agents are considered. On the one hand, the government makes the investment decision for the traffic network improvement based on the current traffic condition under the limited budget. On the other hand, households and companies will choose their locations according to the attraction of each traffic zone related to the road network accessibility and the housing price. Therefore, the land use is indicated by the population and employment distributions through the evolution process. Besides, the improvement of road capacity is modeled by a general bi-level programming of traffic network design. Simulation experiments show that the city will be more efficient and will have higher average accessibility for employment and population in the evolution process.     

Semiglobal stabilization of saturated linear systems via multiple parametric Lyapunov equations

This paper investigates the problem of semiglobal stabilization with guaranteed flexible pole placement for saturated linear systems. To retain the advantages of the parametric Lyapunov equation, matrix‐partitioning idea is used to derive a new pole shift lemma. Starting from system matrix transformations, a recursive algorithm is proposed to shift every eigenvalue of a linear system separately without mode decomposition in each step. A new method introducing various parameters to every Lyapunov equation in each step is presented. As an application, the semiglobal stabilization with guaranteed flexible pole placement for saturated linear systems can be achieved by this method. Finally, its effectiveness and advantages are demonstrated via a simulation example. Copyright © 2013 John Wiley & Sons, Ltd.     

基于模糊逻辑的上肢康复机器人阻抗控制实验研究

针对机器人辅助患肢主动康复训练过程中辅助力／阻力不能随患肢病情实时调整的问题,提出了一种 新的模糊自适应阻抗力控制方法．该方法实时检测患肢与机器人之间的相互作用力,并进一步运用辨识算法实时估 计出患肢的病情状态;然后运用模糊阻抗控制器对两者之间的相互作用力进行实时调整,使得在患肢主动能力不 足时提供一定的辅助,而在其有能力完成动作时,实时调整阻力实现肌力训练．实验结果表明了该控制方法的有效 性．     

浅谈网络办公自动化系统分析与设计

目前,网络办公自动化系统在企业日益普及。本文首先介绍了网络办公自动化系统分析,然后详细阐述了系统的设计,最后探讨了网络办公自动化系统主要模块功能。     

A new delay system approach to network-based control

This paper presents a new delay system approach to network-based control. This approach is based on a new time-delay model proposed recently, which contains multiple successive delay components in the state. Firstly, new results on stability and H_∞ performance are proposed for systems with two successive delay components, by exploiting a new Lyapunov-Krasovskii functional and by making use of novel techniques for time-delay systems. An illustrative example is provided to show the advantage of these results. The second part of this paper utilizes the new model to investigate the problem of network-based control, which has emerged as a topic of significant interest in the control community. A sampled-data networked control system with simultaneous consideration of network induced delays, data packet dropouts and measurement quantization is modeled as a nonlinear time-delay system with two successive delay components in the state and, the problem of network-based H_∞ control is solved accordingly. Illustrative examples are provided to show the advantage and applicability of the developed results for network-based controller design.     

基于点云配准的多固态激光雷达标定算法

针对多个固态激光雷达协同工作时,需要准确地进行外参标定的实际需求,提出一种基于点云配准的多固态激光雷达自动标定算法。该标定算法由标定物分割、初始配准和精确配准三个阶段构成。在标定物分割阶段,首先通过叠加多帧非重复扫描数据制作标定点云,再使用半径滤波和体素下采样滤波分割出纹理特征明显的目标点云。在初始配准阶段,使用3D-HARRIS算法提取关键点,并使用方向直方图(SHOT)特征描述子进行特征描述,然后匹配对应点并使用采样一致算法完成初始配准;在精配准阶段使用迭代最近邻(ICP)算法进行精确配准,从而获得精确的外参标定效果。在Bunny兔数据集和现场获得的数据上进行实验,结果表明,当保证配准平均误差小于1 mm的前提下,所提出算法的性能优于多种现有算法。