基于Agent技术的供应商管理系统的设计

在Agent技术的基本概念和主要特性的基础上,从应用的角度定义了Agent并指出提供服务是它最根本的特性．同时给出了供应商的评价指标体系和评价供应商的计算方法,并根据Agent的结构原理把供应商的评价指标体系和计算方法转化为供应商管理系统的供应商评价知识库．根据Agent的模型特性和工作原理构造了系统的体系结构,分析了系统的工作原理和系统根据外部环境变化自动反应和动作的实现过程．最后完成模块化设计并用实例进行验证．     

Ti-5Al-2Sn-2Zr-4Mo-4Cr合金本构关系的新模型

本构关系是联系材料塑性变形行为与工艺参数的桥梁,也是用有限元法模拟金属成形过程的前提条件．开发了一个基于神经网络的Ｔｉ－５Ａｌ－２Ｓｎ－２Ｚｒ－４Ｍｏ－４Ｃｒ合金的本构关系模型．首先利用Ｔｈｅｒｍｅｃｍａｓｔｏｒ－Ｚ型热模拟机等温压缩Ｔｉ－５Ａｌ－２Ｓｎ－２Ｚｒ－４Ｍｏ－４Ｃｒ合金,研究在不同变形温度、变形程度和应变速率等工艺参数条件下流动应力的变化情况．然后用实验所得的热变形工艺参数与性能间的数据来训练具有ＢＰ算法的人工神经网络．训练结束后的神经网络即成为一个知识基的本构关系模型．预测结果和实验结果对比表明神经网络模型具有较高的精度和推广能力．     

考虑负荷密度的区域能源系统供能分区规划

现有的区域能源系统规划研究中缺乏科学有效的供能分区优化方法,且能源站的供能范围、数量和选址中未能考虑负荷密度特性问题,为此提出考虑负荷密度的区域能源系统供能分区优化设计方法。首先研究了负荷分布与能源站经济供能半径的关系,根据管网拓扑结构简化模型建立了负荷密度与能源站经济供能半径优化模型。进而基于推导得到的经济供能半径和负荷密度的特性关系,建立了以传统空调系统与区域能源系统的全寿命周期费用差值最大为目标函数的规划模型。最后通过案例仿真并与传统K-means聚类方法进行比较,结果表明该方法可使区域能源系统的能耗损失成本、管网投资成本和运维费用分别降低了22%、5.1%和2.1%。     

离子束诱变中Bacillus fordii MH602菌体保护剂的研究

离子束诱变过程中,菌体细胞较长时间处于干燥、营养贫瘠的条件下,死亡率高,本研究比较了在干燥、营养贫瘠条件下,多种寡糖对对数生长期的嗜热海因酶产生菌Bacillus fordii MH602菌体细胞的保护作用．海藻糖效果显著,其最佳保护剂量为2％;同时证明海藻糖的保护作用没有对离子注入效应产生负面影响;首次报道了在离子束诱变技术中采用海藻糖作为保护剂提高突变率和诱变效果．相关结论对于抗干燥性能较差的微生物采用离子束诱变技术进行菌种选育具有实际指导作用．     

堰塞坝溃决过程中孔隙水压力变化规律

为研究堰塞坝坝体内部孔隙水压力对坝体的溃决发展过程的影响,通过水槽模型试验,在分析堰塞坝溃决过程的基础上,研究了堰塞坝溃决过程中孔隙水压力的变化过程。研究成果表明：根据溃口演化特征,可将堰塞坝的溃决过程分为3个阶段：坡面侵蚀阶段(Ⅰ)、溯源陡坎侵蚀阶段(Ⅱ)、粗化再平衡阶段(Ⅲ),其中,阶段Ⅱ发展最为剧烈;堰塞坝溃决过程中各测点孔隙水压力的变化过程均呈现先增后减的变化趋势,并存在明显的滞后现象;左右两侧的孔隙水压力呈“左小右大”的变化趋势,二者差值随溃口发展速率的加快而增加;上游孔隙水压力较下游明显增大,敏感程度也更高;蓄水期孔压可采用饱和非稳定二维渗流微分方程进行求解,整体变化趋势与实际值相符合,孔压增长速率呈先缓后陡趋势,最大孔压差绝对值为0.09 kPa。     

A communication-aware scheduling algorithm for heterogeneous systems

Previous work mostly employs an ideal system model that assumes fully connected processors and concurrent communication, which leads to inaccurate and inefficient schedule results. In this paper, a new scheduling model which integrates the communication awareness was proposed. Then, a novel scheduling algorithm based on list heuristic was put forward for the new model, which can produce optimal schedule by serializing the communications edges. Experimental results show that the accuracy and efficiency of the new model and algorithm are significantly improved.     

Dynamic characteristics of a working platform Supported by an AMG

A coupled electromechanical dynamic model for a working platform supported by an active magnetic guide （AMG） is set up according to the special stiffness and damping theory of maglev system and the unique vibration of the working platform for a machine tool. The dynamic characteristics of a working platform supported by an AMG are studied using different groups of control parameters. Results show that the dynamic characteristics of the platform system, such as critical vibration frequency, vibration mode and so on, can be improved by adjusting the control parameters. This research offers theoretical support for ultra-high-speed and ultra-precise machine working platform designs, including the structure of platforms, the design of electromagnets, and the establishment of the control parameters.     

PSO算法扰动优化策略及其收敛性研究

为进一步提升求解精度、有效抑制早熟收敛,各类扰动（变异或跳转）优化策略常用来对粒子群优化（Particle Swarm Optimization,PSO）算法的pBest、gBest进行极值扰动,由此增强粒子在多维空间的搜索能力、提升算法性能．为分析扰动优化策略下粒子（PSO算法的搜索引擎）在多维空间的轨迹行为特性,采用级数对多维空间中粒子进行了理论分析并证明了扰动后粒子轨迹的收敛性;最后,结合项目调度问题在多维空间中对随机粒子运动轨迹进行了实证分析,验证了理论证明的相关结果．     

非遗语境下古琴音乐的价值意义和发展保护

古琴是中国最古老的弹拨乐器之一,有着三千多年的悠久历史.古琴音乐风格独特,意蕴深厚,曲目数量众多,琴学理论丰富,琴家杰出,流派纷呈,在历史、文化、艺术、社会等方面具有独特的价值,是中国传统音乐中的瑰宝.在当前大力提倡非遗保护的环境下,亟须全面而客观地认识和评价古琴音乐,既将古琴音乐原汁原味地保护和传承下来,又立足时代要求,对其进行创新发展与合理利用,从而使古琴音乐焕发出新的生命力.     

Passive seismic experiment and ScS wave splitting in the southwestern subbasin of South China Sea

The seismic experiment of 3D array of OBS in the southwestern sub-basin of the South China Sea(SCS) is briefly introduced in this paper.The data analysis of broadband OBS shows that totally 93 earthquakes with magnitude of Ms 6.0-6.9 and 10 earthquakes with magnitude above Ms 7.0 were recorded in high quality during this experiment,especially the catastrophic earthquake Ms 9.0 occurred in the east sea area of Japan on March 11,2011.The anisotropy parameters inversion of ScS wave of four events above Ms 7.0 indicates that the fast direction of shear wave is N58°E parallel to the ceased spreading ridge of the southwestern sub-basin of SCS(the slow direction is S35°E perpendicular to the spreading ridge),which means the spreading ridge is under compressing stress at present and the cessation of seafloor spreading is related to such stress field as well.