On a Galerkin boundary node method for potential problems

A Galerkin boundary node method (GBNM), for boundary only analysis of partial differential equations, is discussed in this paper. The GBNM combines an equivalent variational form of a boundary integral equation with the moving least-squares (MLS) approximations for generating the trial and test functions of the variational formulation. In this approach, only a nodal data structure on the boundary of a domain is required, and boundary conditions can be implemented directly and easily despite of the fact that the MLS shape functions lack the delta function property. Formulations of the GBNM using boundary singular integral equations of the second kind for potential problems are developed. The theoretical analysis and numerical results indicate that it is an efficient and accurate numerical method.     

虚拟场景中的实时视频显示研究

针对虚拟场景中实时视频显示过程中设计流程复杂,代码多,画面不畅等问题,提出了基于Kinect摄像头的实时视频添加方法。该方法以Billboard技术为基础,利用Kinect对现实场景进行彩色数据和深度数据捕捉,并在虚拟场景中进行实时渲染和显示,最终实现实时视频子窗口的添加工作。整个程序设计流程简单,渲染效果画面流畅。     

High precision intelligent flexible grasping front-end with CMOS interface for robots application用于智能机器人精细抓握的高灵敏度柔性抓握前端

This paper presents a high-precision intelligent flexible robot grasping front-end with an integrated capacitive tactile sensor array and a conditioning chip. The capacitive tactile sensor is the primary part of the front-end, it determines the overall performance. The micro-needle array sandwich structure in the tactile sensor increases the repeatability and stability, and ensures the sensitivity. The assembled sensor exhibits a saturation at 10.53 N (421 kPa) with a sensitivity of 1.9%/kPa. Furthermore, a conditioning chip is utilized in a custom readout interface to achieve better performance by reducing signal attenuation, and to increase the compatibility of the front-end. The chip is optimized for the parasitic shunt capacitance in the capacitor array. A dual bidirectional charge-discharge conversion method and a two-port detection method are matched to achieve the goal of reducing the shunting influence, and attenuating the offset voltage or the noise input effects. A prototype of the interface has been fabricated using 180-nm CMOS technology. Sensor with the value of 0.5 pF shunted by capacitors of 47 pF has been detected with an error of 1% within 100 μs.     

Follow the perturbed approximate leader for solving semi-bandit combinatorial optimization

Combinatorial optimization in the face of uncertainty is a challenge in both operational research and machine learning. In this paper, we consider a special and important class called the adversarial online combinatorial optimization with semi-bandit feedback, in which a player makes combinatorial decisions and gets the corresponding feedback repeatedly. While existing algorithms focus on the regret guarantee or assume there exists an efficient offline oracle, it is still a challenge to solve this problem efficiently if the offline counterpart is NP-hard. In this paper, we propose a variant of the Followthe-Perturbed-Leader (FPL) algorithm to solve this problem. Unlike the existing FPL approach, our method employs an approximation algorithm as an offline oracle and perturbs the collected data by adding nonnegative random variables. Our approach is simple and computationally efficient. Moreover, it can guarantee a sublinear (1+ ε)-scaled regret of order O(T^{\frac{2}{3}}) for any small ε>0 for an important class of combinatorial optimization problems that admit an FPTAS (fully polynomial time approximation scheme), in which Tis the number of rounds of the learning process. In addition to the theoretical analysis, we also conduct a series of experiments to demonstrate the performance of our algorithm.     

High-order compact splitting multisymplectic method for the coupled nonlinear Schrödinger equations

In this paper, we develop a new kind of multisymplectic integrator for the coupled nonlinear Schrödinger (CNLS) equations. The CNLS equations are cast into multisymplectic formulation. Then it is split into a linear multisymplectic formulation and a nonlinear Hamiltonian system. The space of the linear subproblem is approximated by a high-order compact (HOC) method which is new in multisymplectic context. The nonlinear subproblem is integrated exactly. For splitting and approximation, we utilize an HOC–SMS integrator. Its stability and conservation laws are investigated in theory. Numerical results are presented to demonstrate the accuracy, conservation laws, and to simulate various solitons as well, for the HOC–SMS integrator. They are consistent with our theoretical analysis.     

苍耳油制取亚油酸的研究

本文用气相色谱测定苍耳油的组成是软脂酸５．１％．硬脂酸３．６％；油酸２６．８％：亚油酸６４．１％；亚麻酸０．４％．苍耳油通过皂化，酸化，冷冻结晶等工艺制出符合医药标准的亚油酸．并对这些工艺参数进行了考察．     

小车变幅机构制动时塔机动态分析

用有限元法对小车变幅式塔机结构动态特性进行了理论分析、计算；同时，对塔机动臂起吊货物时，小车变幅机构     

高炉喷补料抗CO气体侵蚀动力学研究

基于CO气体在耐火材料中输运过程的基本特征,在综合考虑吸附、扩散及化学反应相互影响的基础上,得出了碳沉积反应与各种反应条件之间关系的理论表达式.同时针对新开发的高炉喷补料进行了纯CO气体中的热重实验研究,结合对碳沉积动力学过程的系统分析,说明了不同步骤对表观碳沉积速度的影响特征.理论和实验研究结果表明:高炉喷补料中CO气体侵蚀的碳沉积反应依次由吸附、化学反应和扩散过程控制.     

预应力混凝土空心板芯孔注水养护技术

预应力混凝土空心板芯孔注水养护技术 ,是针对中小型混凝土预制构件厂挤压成型的预应力空心板的生产而开发的一种实用新技术。它对提高产品质量 ,加快台座的周转 ,提高经济效益都有积极作用 ,有一定的推广应用价值。     

AK糖的合成工艺及研究现状

AK糖是一种优良的合成甜味剂,因其甜度高,无热量而被广泛应用于食品饮料等各行业。自AK糖被作为食品添加剂使用以来,其合成生产工艺已经历几代发展,其生产工艺也已渐趋成熟。文章总结了AK糖的合成发展历程以及生产工艺研究现状。