摘要：研究了基于FCC辐射遮蔽约束的超宽带无线通信系统超短脉冲波形设计方法。以具有不同形状因子和频谱搬移因子的高斯二阶微分脉冲为基函数,提出迭代组合和LMMSE(线性最小均方误差)组合的UWB(超宽带)脉冲设计方法。对采用迭代组合脉冲或高斯二阶微分脉冲的系统在高斯信道下的单链路误比特率、多址、多径等性能进行了仿真比较,验证了所提出的组合脉冲设计方法。

摘要：借鉴金融工程中条件风睑价值理论,提出了分销网络条件风睑价值的概念和计算公式,并用之度量分销网络风险水平.构建了以DNCVaR、利润、客户满意度为目标的分销网络设计多目标优化模型.该模型不仅能体现供应链核心企业风险偏好度,而且还能解决分销网络风险水孚-分销中心设立-分销中心购买量-分销中心服务对象-分销点购买量组合决策问题.并应用多项式目标优化技术进行了多目标组合.这些工作为CVaR与分销网络设计优化决策类问题的结合研究作了有益的探索,且算例的优化决策结果也说明了文中构建的模型能有效解决上述组合决策问题.

摘要：在分析同步电动机交交变频调速系统运行的基础上,提出了把同步电动机的d、q 轴各变量分解为低频分量(含非周期分量)和高频分量分别加以处理,忽略转子回路对高频分量的电阻以及阻尼绕组对低频分量作用的分析方法。进而建立了适合于稳态和似稳态分析的同步电动机等效电路模型;应用该模型,文中提出了设计调速系统电流控制器的新方法。运行试验及仿真结果表明所建立的等效电路模型是正确的,所提出的调节器设计方法是有效的。

摘要：In order to enhance the glutathione peroxidase（GPX） catalytic activity of the selenium-containing single-chain variable fragments（Se-scFv）, a novel human scFv was designed on the basis of the structure of human antibody and optimized via bioinformatics methods such as homologous sequence analysis, three-dimensional（3D） model building, binding-site analysis and docking. The DNA sequence of the new human scFv was synthesized and cloned into the expression vector pET22b（＋）, then the scFv protein was expressed in soluble form in Escherichia coli BL21（DE3） and purified by Ni2＋-immobilized metal affinity chromatography（IMAC）. The serine residue of scFv in the active site was converted into selenocysteine（Sec） with the chemical modification method, thus, the human Se-scFv with GPX activity was obtained. The GPX activity of the Se-scFv protein was characterized. Compared with other Se-scFv, the new human Se-scFv showed similar efficiency for catalyzing the reduction of hydrogen peroxide by glutathione. It exhibited pH and temperature dependent catalytic activity and a typical ping-pong kinetic mechanism.

摘要：多发射-多接收雷达发射方向图合成是当前波形设计和合成问题的热点,其目的在于实现将发射能量聚焦在感兴趣的空域方向上。而在复杂的电磁环境中,还必须兼顾考虑在拥堵频段上的频谱兼容性和灵活性,避免影响邻近频段通信系统传输性能。该文提出算法设计MIMO雷达发射波形向目标空域聚焦能量的同时,避开拥堵频段的频率范围。即针对发射波形在空域、频域两类要求而联合优化。联合优化问题被建模为加权均方误差代价函数,优化问题是非凸非平滑的。在算法的每一步迭代优化中,首先更新当前步骤的匹配系数,再对均方误差代价函数进行放缩,构造替代函数;进而优化替代函数,得到较小代价函数值对应的波形。该文提出的迭代优化算法,具有接近理想的方向图合成性能与频谱塑形性能,且运算量小。仿真和数值结果证明了该方法的有效性。

摘要：本文针对低雷诺数条件下低压涡轮效率较低的问题,提出了设计过程中应如何考虑雷诺数影响的思路,给出了适应低雷诺数环境下工作的叶片表面负荷分布形式,并进行了低压涡轮的气动设计。三维粘性计算的结果表明,应用本文所提出的负荷分布形式,能够有效的控制涡轮边界层的分离,降低气动性能对雷诺数的敏感程度,从而使得低压涡轮在高空低雷诺数条件下仍能保持较好的性能。

摘要：A Neutron Time-of-Flight(NTOF) spectrometer, based at the Heavy Ion Research Facility in Lanzhou(HIRFL) was developed for studies of neutron production of proton induced spallation reactions related to the ADS project. After the presentation of comparisons between calculated spallation neutron production doubledifferential cross sections and the available experimental data, a detailed description of the NTOF spectrometer is given. Test beam results show that the spectrometer works well and data analysis procedures are *** comparisons of the test beam neutron spectra with those of GEANT4 simulations are presented.

摘要：作为一种研究复杂系统的有效手段,基于Agent的建模仿真方法得到了广泛应用。但目前还没有一种得到广泛认可的建模仿真规范来指导和约束Agent仿真模型的设计、开发、集成和运行,不利于提高Agent仿真模型的可重用性和开发效率。提出将采用模型驱动架构和基于组件设计思想的仿真模型可移植性规范(simu-lation model portability standard 2.0,SMP2)引入到基于Agent的建模仿真中,通过把Agent仿真中的元素映射到SMP2的模型设计和开发模式架构下,并根据Agent仿真特性对SMP2进行相应扩展,来支持模型驱动的组件化的Agent仿真模型开发。利用一个应用实例,验证了提出方法的有效性。

摘要：The design and synthesis of multifunctional nanocarriers for efficient synergistic cancer therapy have drawn great research interests in recent *** this work,a nanoplatform for chemo-photothermal therapy with targeting ligand was *** porous structured silica nanotubes(SNTs)with controllable lengths decorated with CuS nanoparticles(NPs)on the surface as photothermal agents were prepared and further conjugated with lactobionic acid groups as a cancer cell *** with average lengths of 40,55 and 150 nm were obtained and further functionalized as drug *** smallest bifunctional SNTs with targeting groups show good biocompatibility and highest cellular uptake for HepG2 *** release of doxorubicin hydrochloride(DOX)from the SNTs was dependent on the p H of the buffer solution and 808-nm near infrared(NIR)light *** integration of photothermal therapy(PTT)of CuS NPs and chemotherapy of anticancer drug leads to a better tumor inhibition effect than the individual therapy alone in vitro and in *** results demonstrate potential applications of the nanocomposites as vector for efficient chemo-photothermal therapy.

摘要：提出了一种新的用于太阳仿真器的照明系统,介绍了照明系统的设计原理和方法,利用光学设计软件对系统进行设计,对影响均匀性的因素进行分析,对匀光器件匀光棒的工作原理进行了探讨并对匀光性利用光学软件Lighttools进行了仿真计算,使整个系统的不均匀性≤7.1%。辐照度达到0.1个太阳常数,满足了设计指标,并提出均匀性进一步提高的方法。