摘要：粒子群优化算法因形式简洁、收敛快速和参数调节机制灵活等优点,同时一次运行可得到多个解,且能逼近非凸或不连续的Pareto最优前端,因而被认为是求解多目标优化问题最具潜力的方法之一.但当粒子群优化算法从单目标问题扩展到多目标问题时,Pareto最优解集的存储与维护、全局和个体最优解的选择以及开发与开采的平衡等问题亦随之出现.通过目标空间变换方法,采用Pareto前端在被称为平行格坐标系统的新目标空间中的分布熵及差熵评估种群的多样性及进化状态,并以此为反馈信息来设计进化策略,使得算法能够兼顾近似Pareto前端的收敛性和多样性.同时,引入格占优和格距离密度的概念来评估Pareto最优解的个体环境适应度,以此建立外部档案更新方法和全局最优解选择机制,最终形成了基于Pareto熵的多目标粒子群优化算法.实验结果表明:在Ig.性能指标上,与另外8种对等算法相比,该算法在由ZDT和DTLZ系列组成的12个多目标测试问题集中表现出了显著的性能优势.

摘要：从信噪比、电极参数选择等角度,研究拉普拉斯电极在脑电应用中的可行性,并且设计了一种用于视觉诱发电位检测的有源拉普拉斯电极。文中利用脉冲信号刺激试验动物视网膜,参考电极放置在一侧耳后乳突处,有源电极固定在枕骨粗隆处,可以检测到视觉电诱发电位,效果良好。

摘要：In this modern era, power g.neration seems to be a very demanding.factor. New models and methods have been proposed to derive from various natural and manmade resources. In such instances, this paper g.ves a detailed report on the power g.neration from Micro Turbines. Micro turbine plays a very important role in electric power g.neration. Especially they are used in the combined cycle process power plants. The parameters of Rowen’s model 265-MW sing.e shaftheavy duty g.s turbines which are used in dynamic studies are estimated in this paper using.the operational and performance data. These data are also used to briefly explain the extraction of parameters of the used model. Micro turbine parameters are approximated using.simple thermodynamics assumptions. Micro turbine power g.neration seems to be an uprising.and a promising.#160;source and an exact desig. with a perfect model is capable of producing.the hig.est efficiency. Thus this paper is proposed on the aspects of social awareness to elaborate the control desig. of Micro Turbine Power g.neration System. The parameters of micro turbine models are derived and the results of several simulated tests using.Matlab/Simulink are presented.

摘要：20世纪60年代美国的游戏场发展到了一个高峰。建筑师和雕塑家,包括路易·康和野口勇在其中扮演了重要的角色,他们合作设计的纽约河畔公园的阿黛儿·柔森沃德·利维游戏场彻底改变了美国传统游戏场的概念,而将艺术和游戏结合起来,体现"游玩必须是自由和不受限制的,空间是通过那些不是模仿自然但无限变化的形状而被发现的"。而从20世纪70年代开始,对安全和责任的过分关注取代了美国的游戏场的创新。在经历了几十年建造游戏场只是满足公认的标准而没有任何创新的衰退期后,一些重要的设计师们开始重新为孩子们设计富有创意和挑战性的游戏环境。

摘要：We derive an alternate analytical expression for the optimum dimensions of an electromag.etic undulator with a finite permeability lamination core. The analytical expressions are compared with earlier results under an infinite permeability approximation of the lamination core of the electromag.etic undulator desig..

摘要：并行和协同产品设计已经成为当前的流行设计模式。具有粒度的产品数据库是理想的支持基于网络的协同设计数据源。重点讨论如何维护面向特征的数据库中产品特征模型的有效性。应用所提出的约束解决方法,能保证产品数据库中特征模型的有效性以支持多应用产品协同设计。

摘要：The Advanced Photon Source （APS） at Arg.nne National Laboratory is considering.the development of a superconducting.linac-based fourth-g.neration hard X-ray source to meet future scientific needs of the hard X-ray user community. This work specifically focuses on the desig. of an optimized 5-cell superconducting.radio-frequency structure well suited for a hig.-energ., hig.-beam-current energ. recovery linac. The cavity desig. parameters are based on the APS storag. ring.nominal 7 g.V and 100 mA beam operation. A hig.-current 5-cell cw superconducting.cavity operating.at 1.4 g.z has been desig.ed. In order to achieve a hig. current, the accelerating.cavity shape has been optimized and larg. end-cell beam pipes have been adopted. The beam break-up threshold of the cavity has been estimated using.the code TDBBU, which predicts a hig. threshold beam current for a 7 g.V energ. recovery linac model. A copper prototype cavity has been fabricated that uses half-cell modules, initially assembled by clamping.the cells tog.ther.

摘要：This work targ.ts the preparation and char-acterization of an inexpensive TiO2-fly ash composite membrane for oily wastewater treatment. The composite membrane was fabricated by depositing.a hydrophilic TiO2 layer on a fly ash membrane via the hydrothermal method, and its structural, morpholog.cal and mechanical properties were evaluated. The separation potential of the composite membrane was evaluated for 100-200 mg.#183;L^-1 synthetic oily wastewater solutions. The results show that the composite membrane has excellent separation performance and can provide permeate stream with oil concentration of only 0.26-5.83 mg.#183;L^-1. Compared with the fly ash membrane in the averag. permeate flux and performance index （49.97 × 10^-4 m^3·m^2·s^-1 and 0.4620%, respectively）, the composite membrane exhibits better performance （51.63× 10^-4 m^3·m^2·s^-1 and 0.4974%）. For the composite surface methodolog. based ash membrane, the response analysis inferred that the optimum process parameters to achieve maximum membrane flux and rejection are 207 kPa, 200 mg.#183;L^-1 and 0.1769 m·s^-1 for applied pressure, feed concentration and cross flow velocity, respectively. Under these conditions, predicted responses are 41.33× 10^-4 m^3·m^2·s^-1 permeate flux and 98.7% rejection, which are in g.od ag.eement with the values obtained from experimental investig.tions （42.84× 10^-4 m^3·m^2·s^-1 and 98.82%）. Therefore, we have demonstrated that the TiO2-fty ash composite membrane as value added product is an efficient way to recycle fly ash and thus mitig.te environmental hazards associated with the disposal of oily wastewaters.

摘要：弹性的定义是"生态系统忍受扰乱而不至于崩溃的能力"。弹性是人类和生态系统被赋予的、自我恢复和适应未来的能力,也许也是人类被赋予的预测和规划未来的能力。本文的目的在于预测风景园林、城市化进程和未来城市及社区的和谐、人性与可持续发展的形式,将讨论以下问题:什么是当前与"弹性景观"相关的风景园林实践的主要思想?它产生的历史根源是什么,它是如何组成的?在此过程中,遗产、价值、平衡和适应力是如何发挥作用的?本文有3个主题来处理或面对与探讨"弹性景观"的思想,即把综合研究城市化的现代条件作为生态城市主义的新兴途径,后工业时代景观对全球环境的作用,以及主要发展中国家的非正规景观设计和基础设施问题。本文及涉及上述3个议题的案例,进一步阐述和探讨了大都市中心及其"弹性景观"如何做到可持续发展并达到社会的公正性,这里对生态的理解超越了自然环境范畴,还包括了社会、政治和文化层面。