用可移动电流丝方法重建HL-2A等离子体边界的研究

根据Shafranov电流密度矩理论，给出了用可移动电流丝方法重建HL-2A装置等离子体边界的具体计算方法，研究了用可移动电流丝方法(VCF法)重建边界的可行性.VCF法与固定电流丝方法(FCF法)和有限电流元法(FCE法)相比，最大的优点就是用1—3个可移动电流丝就可以准确地重建位置和小半径快速变化的等离子体位形，这正好弥补了FCF法的不足.将可移动电流丝方法和FCF法相结合，可以实现全程等离子体放电的边界实时显示和等离子体的位形控制. 关键词： 可移动电流丝方法 边界识别     

数据驱动下的声学器件音质优化

音质是声学器件声音表现的重要衡量标准.但音质的优化过程需要对大量频点的响应进行协同优化,造成优化问题的可求解性较差.该文提出了一种数据驱动下的声学通道拓扑优化设计方法,可实现声-结构系统中的声频响快速预测,进而借助显式拓扑优化技术实现声学器件的音质优化.通过人工神经网络对结构几何参数、激励频率与声频响之间的非线性关系进行建模,以可移动变形组件(moving morphable components, MMC)法中的结构几何参数、激励频率为输入变量,以声压频响作为输出变量,通过训练多层前馈网络建立了声频响的人工神经网络模型.所得结果可以有效地将目标频带内的声压级范围差从44.89 dB缩小至6.49 dB,相较于传统优化方法,求解速度约为之前的16.3倍,表明了当前方法对音质优化问题的快速求解具有明显效果.     

Broadband energy harvesting via magnetic coupling between two movable magnets

Harvesting energy from ambient mechanical vibrations by the piezoelectric effect has been proposed for powering microelectromechanical systems and replacing batteries that have a finite life span. A conventional piezoelectric energy harvester （PEH） is usually designed as a linear resonator, and suffers from a narrow operating bandwidth. To achieve broadband energy harvesting, in this paper we introduce a concept and describe the realization of a novel nonlinear PEH. The proposed PEH consists of a primary piezoelectric cantilever beam coupled to an auxiliary piezoelectric cantilever beam through two movable magnets. For predicting the nonlinear response from the proposed PEH, lumped parameter models are established for the two beams. Both simulation and experiment reveal that for the primary beam, the introduction of magnetic coupling can expand the operating bandwidth as well as improve the output voltage. For the auxiliary beam, the magnitude of the output voltage is slightly reduced, but additional output is observed at off-resonance frequencies. Therefore, broadband energy harvesting can be obtained from both the primary beam and the auxiliary beam.     

信息系统中的可移动Agent

介绍了可移动Agent的特性,可移动Agent可在异质计算机网络中移动,它能感知网络的状态,监控系统并与其它Agent进行交互,导航模型可以让Agent适应网络的变化并自主制定导航计划,从而方便、有效、智能地完成信息检索的任务．     

可移动激光质谱仪及在机动车尾气监测中的应用

激光质谱法是探测环境污染的新方法,它具有高灵敏度、高选择性、多组分和快速实时的特点.文中介绍了可移动激光质谱仪的系统结构、各部分功能以及主要技术指标,报道了该仪器研制设计过程中的某些关键技术问题,并给出了该仪器在机动车尾气监测中的一些实时在线探测结果.     

AN IMPROVED HYBRID BOUNDARY NODE METHOD IN TWO-DIMENSIONAL SOLIDS

The hybrid boundary node method （HBNM） is a promising method for solving boundary value problems with the hybrid displacement variational formulation and shape functions from the moving least squares（MLS） approximation. The main idea is to reduce the dimensionality of the former and keep the meshless advantage of the latter. Following its application in solving potential problems, it is further developed and numerically implemented for 2D solids in this paper. The rigid movement method is employed to solve the hyper-singular integrations. Numerical examples for some 2D solids have been given to show the characteristics. The computation results obtained by the present method are in excellent agreement with the analytical solution. The parameters that influence the performance of this method are studied through numerical examples.     

可移动激光质谱仪的研制与应用

激光质谱法是一种新的环境测污方法,具有高灵敏度、高选择性、多组分同时测量和快速实时的特点。本研究介绍了新近研制的可移动激光质谱仪的系统结构、各部分功能、原理以及主要技术指标。该仪器能在大气压下采样,并在设计过程中解决了记忆效应,使用输出波长248nm的KrF准分子激光器,可以对芳香烃进行多组分同时检测。该仪器对机动车尾气中苯系物含量的实时在线测量结果表明,尾气中含有苯、甲苯、二甲苯、三甲苯、萘、甲基萘等多种芳香烃污染物,检测的灵敏度达0．1mg／m^3,时间响应可达0．1s。     

基于移动可信平台模块的通用PC机系统可信增强

为了提高终端安全性能,提出并实现了移动可信平台模块(RTPM)和在其支持下的通用PC机系统可信增强架构及原型设计方案.RTPM通过USB接口与计算机平台连接,可接管启动控制权对后续启动的系统进行可信度量.该架构以RTPM为支撑实现完整的系统可信引导,将可信计算机制扩展剑操作系统和应用层,在不改变PC机硬件结构和通用计算机基本输入输出系统的情况下构建可信计算环境,为终端安全技术手段提供基础支撑,具有很强的实用性.