摘要：An optimization method for time-delayed feedback control of partially observable linear building structures subjected to seismic excitation is proposed. A time-delayed control problem of partially observable linear building structure under horizontal ground acceleration excitation is formulated and converted into that of completely observable linear structure by using separation principle. The time-delayed control forces are approximately expressed in terms of control forces without time delay. The control system is then governed by Itoe stochastic differential equations for the conditional means of system states and then transformed into those for the conditional means of modal energies by using the stochastic averaging method for quasi-Hamiltonian systems. The control law is assumed to be modal velocity feedback control with time delay and the unknown control gains are determined by the modal performance indices. A three-storey building structure is taken as example to illustrate the proposal method and the numerical results are confirmed by using Monte Carlo simulation.

摘要：To the Editor： In a single-center, prospective randomized clinical study including 122 elderly patients undergoing the carotid endarterectomy （CEA）, Wang et al. showed that compared with propofol-based total intravenous anesthesia, low-dose sevoflurane inhalation along with propofol reduced the incidence of postoperative myocardial injury.

摘要：针对齿槽转矩会使电机在运行过程中产生转矩振荡和噪声,影响电机的性能指标的问题,对比抑制齿槽转矩的几种方法,指出极宽调制方法在削弱齿槽转矩方面的可行性。通过有限元建模,分别计算传统表面式和极宽调制式两种转子结构永磁电机的齿槽转矩;设计构建一个由角度传感器、永磁电机、扭矩扳手等器件组成的齿槽转矩测试系统,对两种不同结构样机的齿槽转矩进行实验。实验结果与仿真结果具有一致性,对齿槽转矩的削弱幅度均在30%以上,说明极宽调制方法可以削弱永磁电机齿槽转矩,是削弱齿槽转矩的新方法。

摘要：本文提出了一种新的说话人码本的优化设计方法—粒子对协同优化算法,应用于矢量量化的说话人辨认.此算法利用两个初始粒子对分别在每次迭代中执行粒子群优化算法的速度、位置更新和标准LBG算法实现并行搜索最优码本,粒子对由两个粒子构成,每隔一定的迭代次数通过交换粒子实现粒子对间的信息交流,最后分别选出两个较优粒子组成精英粒子对进一步搜索.此算法避免传统LBG算法陷入局部最优的缺点.实验结果表明,本算法始终稳定地取得显著优于LBG、FCM、FRLVQ-FVQ、FEP和PSO算法的说话人辨认性能,较好地解决了初始码本影响优化结果的问题,且在计算时间和收敛速度方面有优势.

摘要：针对粒子滤波计算量大、硬件实现困难的问题,提出了一种用于纯方位跟踪的简化粒子滤波算法,并通过Xilinx System Generator在FPGA上实现。首先,对通用粒子滤波算法进行适当简化,使其减少计算量并且易于硬件实现;其次,采用模块化设计,利用状态机综合并实现各个模块的时序控制;最后,转换为硬件语言,完成硬件仿真。仿真结果表明,所设计的简化粒子滤波算法各个模块工作正常,且具有较好的跟踪精度及运行速度,可用于非线性、非高斯系统的粒子滤波实现,对于粒子滤波的硬件实现方面具有一定的参考价值。

摘要：针对涠洲湾自安装生产平台具体案例，研究自安装生产平台海上安装方案。根据涠洲湾海域的特点，以及中海油多年浮托安装经验，确定了自安装生产平台安装方案，提出提升系统的设计要求。由于安装船舶和自安装生产平台在安装就位时的碰撞，确定在其两者间增加DSU来缓解碰撞力。针对安装中多体耦合现象，从安装特性出发，提出切实可行的安装设计方案，该方法对于自安装生产平台安装设计和研究具有借鉴意义。

摘要：对大学生进行文化素质教育 ,是 2 1世纪培养高素质人才的需要。在目前改革开放的新形势下 ,我们应通过科学的课程设计 ,优良的校园文化环境等途径 ,把人文教育和科学精神的培养 ,作为高等教育改革的重要切入点。

摘要：采用裂区设计,研究了不同灌水时期对小麦产量和水分利用效率的影响。结果表明,冬前限量灌水塌实了土壤,促进了小麦冬前分蘖和次生根喷发,提高了成穗数,从而提高了产量;配合孕穗期增量灌水小麦产量最高、水分利用效率最高;配合拔节期增量灌水产量和水分利用效率均次之,且二者间差异不显著。

摘要：嵌入式系统课程是一门理论与实践相结合的课程,该课程特别注重学生实践能力的培养,文章首先阐述嵌入式系统教学的特点,结合CDIO(做中学)的新型教学模式,通过设计多个实践课程,探讨实践的过程中学习理论知识、理论知识指导实践的教学模式。

摘要：TiO_(2)-based materials have been considered as one of most promising alternatives for high-performance li(Na)-ion batteries because of the low cost,simple composition,easy synthesis,good environmental protection,excellent safety and relatively high specific ***,the inferior electronic conductivity and poor ion diffusion coefficients are the biggest bottlenecks that restrict the popular *** effort has been focused on resolving these problems toward large-scale applications,and numerous significant advances have been *** the present work,a comprehensive overview of structure characteristics,electrochemical reaction mechanism and modification strategies of TiO_(2)-based materials was *** recent advances of various efficient ways for improving conductivity,li(Na)storage capacity,rate capability and cycle stability are systematically summarized,including surface engineering,constructing composite and element doping,*** TiO_(2)-based materials with novel porous heterogeneous core-shell structures have been regarded as one of the most effective ways to resolve these ***,the future research directions and development prospects of TiO_(2)-based anode materials used in the manufacture of high-performance li(Na)-ion batteries are *** review can provide important comprehension for the construction and optimization of highperformance of TiO_(2)-based anode materials.