分析电磁散射问题的MGFFT方法

采用多重网格法(MG)分析电大尺寸物体的电磁散射,这种MG方法与已有的几种多重矩量法有本质的不同,与其他多层方法相比,它是一种高效率的迭代方法。再利用积分方程的卷积特性引入FFT方法快速计算迭代过程中矩阵与矢量的乘积,从而构成MGFFT新算法,数值结果表明MGFFT方法具有很高的计算效率,适用于电大尺寸问题的分析。     

大型结构分析的循环结点法

目前,用有限单元法分析大型结构,在总体刚度方程组装和求解方面,存在着内外存交换频繁,检索关系复杂,需用内存资源多等问题.本文针对上述问题,提出了“大型结构分析的循环结点法”.通过实际工程运用,证明该方法具有节省内存,占用机时少,程序简单等特点.尤其将该方法使用于内存小,内外存交换件条差的微型机或袖珍机上,可进行大中型结构(如高层或超高层建筑结构)分析,收效十分显著.     

基于合同网的多agent任务分配分布式优化算法

针对合同网下的多agent系统,基于集合覆盖理论提出了一种解决子任务分配的严格启发式搜索算法;并分析了该算法的收敛性及渐进时间复杂度;证明了其搜索结果的上确界．该算法具有分布性,搜索空间缩减快,适合于中小型的多agent系统的子任务分配．     

基于MAS的通信卫星系统整体效能评估方法

针对目前通信卫星系统效能评估中存在的不足,结合系统学中自上而下的分析方法与自底向上的综合方法,建立了通信卫星系统的整体效能评估方法,包括整体性分析、综合集成以及结果分析3部分。以信息传输时延为主要效能指标,在整体性分析中,通过建立系统学模型,确定系统的构成要素和要素之间的关系。在综合集成中,利用基于多Agent系统（multi-agent system,MAS）的建模与仿真方法,确定通信卫星系统的MAS结构和单个通信卫星Agent的行为规则。最后基于AnyLogic软件对所建模型进行了仿真,验证了效能评估方法的合理性和有效性。     

基于MAS的含FACTS元件输电线路自适应协调配合方案的研究

针对FACTS元件的装设对传统继电保护和重合闸性能的影响,分析了含FACTS元件的超高压输电线路中的FACTS控制器与传统线路保护及自动重合闸之间存在的配合问题,结合Agent技术的自治性、协同性、智能性和适应性的优点,提出了一种基于多智能体系统(MAS)的自适应协调配合方案。方案中,MAS体系结构分为诊断、协调、执行3模块,首先由诊断Agent对系统的运行状态进行诊断,根据诊断结果由协调Agent实现不同的自适应协调策略,最后形成各自治Agent的动作序列,由执行Agent完成操作。由于各Agent相对独立又相互协调,从整体上可以大大提高系统的稳定性。     

基于MAS的协作Agent间的联盟策略研究

Agent是一个在分布式系统或者协作式系统中能持续自主发挥作用的实体,它具有自主性、主动性、反应性和智能性的特点.随着单个Agent研究的逐渐深入,多Agent系统越来越受到关注,多agent机器人系统(MAS)是目前研究的热点.个体Agent之间互相合作、协作和相互服务,可以共同构成一个功能强大的多Agent系统(多智能体系统-MAS).MAS可以由多个智能和能力较低或较单一的Agent组成,也可以以几个较复杂的Agent成员为基础,结合其他简单Agent成员共同组成.本文首先介绍了Agent的概念、特性和结构模型,通过分析Shapley和Postman算法的优缺点对多Agent在协作过程中的联盟策略进行了研究.     

A new method to evaluate the hydraulic activity of Al-Si materials

Slag, fly ash, gangue and 500°C calcined gangue are analyzed by using identical coupled plasma optical emission spectroscopy (ICP), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR) and magnetic angle spinning nuclear magnetic resonance (MAS NMR). Research results show that there is a negative linear relationship between the Si 2p and Al 2p binding energies of Al-Si materials and the compressive strength of aluminosilicate based cementitious materials prepared with these Al-Si materials, i.e. the lower the binding energies, the higher the compressive strength. Indeed, the Si 2p and Al 2p binding energies of Al-Si materials can be used to indicate their hydraulic activity. The binding energies of the four examined materials increase in the order of slag, fly ash, 500°C calcined gangue and untreated gangue. Moreover, the binding energies of Si 2p, Al 2p and O 1s of every Al-Si material have excellent correlation. By using the Al 2p binding energy and 27Al MAS NMR spectra, the coordination number of aluminum in slag is determined to be four, while that in gangue, is six. Based on the aforementioned discoveries, this paper presents a new effective method to evaluate the hydraulic activity of Al-Si materials by using the surface binding energies of silicon and aluminum of Al-Si materials. Supported by the National Natural Science Foundation of China (Grant No. 50474002) and the Key Project of Ministry of Education of China (Grant No.104231)     

含有储能单元的微电网运行控制技术

含有储能单元的微电网运行控制技术为可再生能源发电的规模化利用提供高效的组织形式和管理手段．搭建包括光伏、风电、储能单元的典型微电网控制系统;光伏、风机采用最大功率跟综控制,以保证风能和光能的最大利用率;给出含有储能单元的微电网组网方案和运行控制方式,分析储能在微电网并网运行、孤岛运行、孤岛下负荷变化及无缝切换等过程中的能量控制作用;基于LCL滤波器的储能电压源型功率变换器,提出包含逆变器侧电感电流环、滤波电容电压环和电网侧电感电流环的三环控制策略．最后,仿真验证了该储能逆变器控制策略和方法合理有效．     

A game-theoretic method for prediction of microgrid growing trends in China

This paper presents a game-theoretic method to predict microgrid(MG) development tendency in China. As many distribution generators(DGs) are integrated in distribution systems, analysis of MG formation necessity is conducted from the aspect of DGs. In order to maximize the profit brought by DGs and to earn money from arbitrage, it may be necessary for customers to combine their DGs and loads and to construct an MG to obtain maximal control ability. A game model is built to emulate trading between MGs and the distribution system based on MG power control, in which both trading profit and outage cost are considered for each MG. Nash equilibrium(NE) is calculated, and sensitivities of NE to some boundary conditions are studied. The results show that variable MG trading prices with appropriate net generation cost(i.e., DG generation cost minus government subsidy price) may encourage the growth of MGs. Government subsidies, generation costs, and trading prices may also affect DG use, and therefore they may impact customer motivation to build MGs.     

Characterization and thermal conductivity of modified graphite/fatty acid eutectic/PMMA form-stable phase change material

We prepared and characterized a form-stable composite phase change material (PCM) with higher thermal conductivity. Capric acid(CA)-myristic acid(MA) eutectic as core, poly-methyl methacrylate (PMMA) as supportive matrix and modified graphite (MG) powders serving as the thermal conductance improver were blended by bulk-polymerization method. The composite PCMs with different MG mass fraction (2%, 5%, 7%, 10% and 15%) were characterized by FT-IR, SEM, DSC technique and mechanical tests. Thermal conductivities of the composites were measured by transient hot-wire method. The results indicate that MG powders have been successfully inserted into the CA-MA/PMMA matrix without any chemical reaction with each other. The MG/CA-MA/PMMA composites maintain good thermal storage performance while the thermal conductivity has been enhanced significantly. The composite PCM added with 15 wt% MG powders increases approximately as 195.9% in thermal conductivity. Moreover, the thermal conductivity improvement of the composite PCMs is also verified by the melting-freezing experiment, which is profitable for the heat transfer efficiency in latent heat thermal energy storage system.     

MAS环境下实现Agent交互协作的关键技术

讨论了MAS环境下实现Agent交互协作的关键性问题。在分析Agent协同设计目标的基础上,将遗传算法应用于子任务的调度,提高了Agent协同工作的效率。应用Agent的通信语言建立了一个基于知识查询与操纵语言的Agent通信模型,通过引入Agent位置追踪和Agent消息缓存机制解决了Agent移动过程中遇到的位置追踪和通信失效问题。     

基于混合式多智能体系统的协作多机器人系统研究

针对各种先进制造模式对多机器人系统开放性、灵活性的要求 ,利用智能体 (Agent)的思想 ,综合了集中规划与分布规划的优点 ,在局域网环境下 ,设计了用动态集中规划方法构造的混合式MAS (Multi AgentSystem)协作多机器人系统 .对机器人Agent的结构及各模块的功能进行了重点介绍 .该混合式MAS的特点是 :可以方便地动态增加或减少Agents;允许存在异构的机器人 ;并能够根据各Agent的运行状态和工作能力的变化 ,对任务进行重新分解和分配 .系统实验结果表明 ,该系统较传统的机器人系统具有良好的开放性、灵活性和鲁棒性     

Relationship between the microstructure and reaction performance of aluminosilicate

A systematic study was conducted to comprehend the mechanism of thermal activation of silica-alumina materials by using 29 Si and 27 Al magnetic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy.The reaction performance of silica-alumina-based materials with different molar ratios of Si/Al,which were thermally activated,was also investigated.With the increase in calcining temperature,the coordination of Al in metakaolin becomes four,five,and six firstly,and then transforms completely to four ...     

问题层与交互层分离的多Agent系统组织结构设计

MAS组织结构作为Agent成员协作交互的框架,是多Agent系统实现系统目标的基础.设计适用于不同应用领域的MAS组织结构有利于降低转换应用成本.提出MAS组织结构设计过程,其主要特点在于:将应用领域相关知识从可普遍适用的组织协作机制中抽离出来,从而提高组织的协调机制部分的可重用性和可扩展性,而且该设计过程允许在没有预先说明协调机制之前,就可以进行一种说明性的、基于领域知识的组织设计.首先详细介绍问题层与交互层分离的多Agent系统组织结构的设计过程,随后给出交互层的实现过程及原型设计说明.     

基于乘性梯度的医学超声图像边缘检测算法

通过改进传统乘性梯度（MG）算子,并结合Canny算子的处理结果,准确、快速地提取了医学超声图像的边缘.通过提升乘性梯度算子模板的维度,提高对弱边缘的检测能力;综合考虑乘性梯度算子和Canny算子的运算结果,提高边缘检测的准确度.为了验证该算法的有效性,对仿真及在体超声图像进行边缘提取实验,将结果与其他抗噪性较好的边缘检测方法进行对比.实验结果表明：对于含有不同强度斑点噪声的超声图像,该算法的边缘检测准确度可达75%以上,具有较好的实时性,适用于对医学超声图像进行快速、准确的边缘检测.     

Research of Multi-Agent System based satellite fault diagnosis

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基于Agent UML的多Agent系统建模研究

由于Agent和对象的差异,本文引入Agent UML对多Agent系统进行建模研究.简要介绍了UML和Agent UML,以供应链管理为实例从多Agent系统的需求分析、静态建模、动态建模出发,给出了基于Agent UML的建模方法和步骤.     

关于多重网格法

多重网格法(Multiple Grid Method),简称M-G方法是近年来求解偏微分方程边值问题的快速方法之一,本文给出M-G方法的程序设计步骤,在定义工作单位数的基础上,用M-G方法求解了线性椭圆型边值问题。其计算结果表明:M-G方法具有收敛速度快的优点,当M-G方法所用层数越多,收敛速度就越快;而且控制粗、细网格层之间自适应转换的控制参数在选取上有很大的灵活性。     

Multiple structure graphite stabilized stearic acid as composite phase change materials for thermal energy storageOA

This paper used 3 types of graphite with different physical structures as the porous matrix to prepare composite phase change materials(PCMs), and investigated their photo-thermal conversion performance and application in battery thermal management. Multiple structure graphite minerals, including microcrystalline graphite(MG), scale graphite(SG), and expanded graphite(EG) were used as porous matrix,while stearic acid(SA) acts as the phase change material. The vacuum impregnation method was appli...     

基于多Agent的网关

随着多代理系统（MAS）的快速发展,不同MAS之间的通信变得尤为重要。MAS通常为了满足专门的需要而设计,因此MAS很难符合某一种标准。阐述了一种称为代理网关的工具,试图使用一种简单有效的方法解决上述问题。此工具先将来自一个MAS的消息转换成基于XML的中介消息,然后再转换成另一个MAS的消息。