摘要：根据《公路桥梁抗风设计规范》,对于特别重要的桥梁要求对桥址处的设计基本风速进行重新观测或参考实测风速样本进行推算得到,选取合理的基本设计风速。本文选取厦门—漳州跨海大桥附近的厦门市专业气象台和龙海市气象局360个月的极值10分钟平均时距的风速和风向标准值,采用3种极值分布概型推算出不同重现期内的设计风速。得出了厦门海峡桥址处100年一遇的期望风速为35.8 m/s,小于规范给出的厦门地区100年一遇基本设计风速39.7 m/s。

摘要：Negative Poisson's ratio(NPR) structure has outstanding performances in lightweight and energy absorption, and it can be widely applied in automotive industries. By combining the front anti-collision beam, crash box and NPR structure, a novel NPR bumper system for improving the crashworthiness is first proposed in the work. The performances of the NPR bumper system are detailed studied by comparing to traditional bumper system and aluminum foam filled bumper system. To achieve the rapid design while considering perturbation induced by parameter uncertainties, a multi-objective robust design optimization method of the NPR bumper system is also proposed. The parametric model of the bumper system is constructed by combining the full parametric model of the traditional bumper system and the parametric model of the NPR structure. Optimal Latin hypercube sampling technique and dual response surface method are combined to construct the surrogate models. The multi-objective robust optimization results of the NPR bumper system are then obtained by applying the multi-objective particle swarm optimization algorithm and six sigma criteria. The results yielded from the optimizations indicate that the energy absorption capacity is improved significantly by the NPR bumper system and its performances are further optimized efficiently by the multi-objective robust design optimization method.

摘要：The dynanaic model of a novel electric power steering（EPS） system integrated with active front steer- ing function and the three-freedom steering model are built. Based on these models, the concepts and the quanti- tative expressions of road feel, sensitivity, and operation stability of the steering are introduced. Then, according to constrained optimization features of multi-variable function, a genetic algorithm is designed. Making the road feel of the steering as optimization objective, and operation stability and sensitivity of the steering as constraints, the system parameters are optimized by the genetic and the coordinate rotation algorithms. Simulation results show that the optimization of the novel EPS system by the genetic algorithm can effectively improve the road feel, thus providing a theoretical basis for the design and optimization of the novel EPS system.

摘要：精确、快速的生物医学检测对于更好的健康监测和及时的治疗具有十分重要的作用.因二维(2D)半导体材料具有高灵敏度、高比表面积以及一步电学信号读取等优势,通过将特定探针构筑在其表面,2D晶体管生物传感器具有巨大的优势.尽管研究者们构建出了各类2D晶体管传感器,但它们在单器件级别的性能和功能受到传感界面和晶体管结构设计的限制,且其商业化仍具有挑战.这里,我们概述了晶体管传感器面临的主要挑战,并探讨了应对这些挑战的晶体管传感器设计与开发思路.最后,强调了该类2D晶体管传感系统走向商业化需做出的改进.与其他电学传感器相关技术的发展历程类似,文中所阐述的观点也对生物电子学其他领域的发展具有一定的启示作用.

摘要：针对一种由Denisov型辐射器和第一面镜为准抛物镜的四级反射镜面系统组成的准光模式变换器开展了详细的研究和设计。利用耦合模理论和矢量绕射理论设计了波纹波导准光模式变化器,通过编写仿真程序进行数值优化完成了140GHz,TE28,8回旋管准光模式变换器的设计。仿真结果表明,抛物面反射镜的焦距对矢量高斯效率影响较大,输出窗口处得到了较好的高斯波束,标量高斯效率达到98%,矢量高斯效率达到90%。

摘要：钾离子电池(PIBs)面临的一个关键问题是设计具有先进结构的负极材料,以实现快速电荷传输以提高钾的存储性能.采用碳二亚胺铁(FeNCN)作为阳极,由于其含有一定数量的共价键且在分子水平上具有稳定的结构,使得储钾系统能够实现优异的电化学性能.FeNCN阳极具有高导电性,带隙接近0 eV,并且由于其共价键结构具有良好的结构稳定性.此外,无定形反应产物也为离子扩散提供了多种途径.因此,FeNCN阳极表现出高可逆比容量(在50 mA g^(-1)电流密度下具有600 mA h g^(-1)比容量),显著的倍率性能和长寿命循环(电流密度为500 mA g^(-1)时拥有400 mA h g^(-1)比容量且超过300次循环).通过理论模拟、X射线原位衍射分析和X射线光电子能谱分析揭示了Fe^(2+)和K^(+)之间的转化反应机理.此外,将FeNCN负极与苝-3,4,9,10-四羧酸二酐正极材料匹配,组装成的全电池在198.6 Wkg^(-1)的功率密度下实现了184.7 W h kg^(-1)的超高能量密度,明显高于以往所有铁基负极的PIBs或钾离子混合电容器.

摘要：摩擦发光(ML)是由机械力作用在材料上引起的发光现象。近年来,金属配合物ML材料因其独特的光学发射特性而受到广泛关注,在应力传感、防伪、结构健康监测、医疗健康、结构检测等领域有着广阔的应用前景。本文综述了近年来具有摩擦发光性质的金属配合物材料的研究进展,包括镧系金属配合物和过渡金属配合物。此外,还讨论了摩擦发光的产生机制、设计原理、光物理性质及其应用前景。本综述将为构建金属配合物摩擦发光材料以及拓展其在应力传感、结构检测等方面的应用提供启发和指导。

摘要：A polarizing beam splitter （PBS） design based on a fused-silica lamellar subwavelength transmission grating is demonstrated with the modal method, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. The physical explanation of the grating diffraction is illustrated by the interference of the corresponding parts of the two propagating modes, which is very similar to a Mach-Zehnder interferometer. It is shown that diffraction efficients over 99% for a TM-polarized wave in the -1st order and 90% for a TE-polarized wave in the 0th order are obtained at the wavelength of 1.053 μm. The polarization transmission extinction ratios are better than 33 dB and 51 dB for the order 0th and the -1st order, respectively. The splitting properties of the PBS grating designed by the modal method are in good agreement with the results simulated by the rigorous coupled wave analysis method.

摘要：入射光在光栅内传输时将激发产生离散模.本文采用模态法调节光栅内离散模的传输特性,使TE和TM偏振光所激发的0、1模为传输模,其余高阶模为消逝模.通过调控0模和1模间的累积相位差,对衍射光进行调控,实现了-1级近100%的高效衍射.采用模态法分三部设计了共振域的矩形全偏振闪耀光栅:1)根据光栅的共振条件给出光栅周期,光栅周期越大槽深越小;2)根据特征模方程计算出光栅占空比;3)根据耦合模条件计算机光栅槽深.实验结果表明,该光栅的TE和TM偏振光同时具备近100%的-1级衍射效率.给出了633nm波长-1级矩形石英全偏振闪耀光栅的典型设计实例,计算结果表明:所设计的全偏振闪耀光栅对TE和TM偏振入射光的-1级衍射效率分别高达96.7%和98.1%,且具有较宽的入射角及入射波长的变化适应范围,较大的制作容差.

摘要：A series of new benzimidazole derivatives was synthesized and characterized by IR,1H NMR,13C NMR,MS,and HRMS *** the new compounds were screened for their antimicrobial activities in vitro by a twofold serial dilution *** bioactive evaluation showed that 3,5-bis(trifluoromethyl)phenyl benzimidazoles were comparably or even more strongly antibacterial and antifungal than the reference drugs Chloromycin,Norfloxacin,and *** combination of2,4-difluorobenzyl benzimidazole derivative 5l and its hydrochloride 7 respectively with the antibacterials Chloromycin,Norfloxacin,and the antifungal Fluconazole was more sensitive to methicillin-resistant MRSA and Fluconazole-insensitive *** addition,the interaction of compound 5l with calf thymus DNA demonstrated that this compound could effectively intercalate into DNA to form a compound 5l-DNA complex that might block DNA replication and thereby exert good antimicrobial activity.