太赫兹偶数分束器设计与公差分析

本文运用二元光学矢量理论设计了一种硅基太赫兹偶数分束器, 实现高衍射效率、高均匀性、有效抑制零级的偶数分束, 突破传统标量方法设计局限性, 给出了分束器脊宽、槽宽、槽深、占空比、基底厚度等结构参数的最优设计值, 并进行了公差分析, 得到分束器各结构参数的加工允许偏差范围, 对器件的设计和制作具有指导意义.     

利用重要度评价矩阵确定复杂网络关键节点

为了对复杂网络节点重要度进行评估,针对节点删除法、节点收缩法和介数法的不足,通过定义节点效率和节点重要度评价矩阵, 提出了一种利用重要度评价矩阵来确定复杂网络关键节点的方法.该方法综合考虑了节点效率、节点度值和相邻节点的重要度贡献,用节点度值和效率值来表征其对相邻节点的重要度贡献,其优化算法的时间复杂度为O(Rn²). 实验分析表明该方法可行有效,对于大型复杂网络可以获得理想的计算能力.     

反馈控制双车道跟驰模型研究

通过引入合理的换道规则，将单车道反馈控制模型扩展成双车道交通流模型.数值仿真表明，与经典的优化速度双车道模型相比，由于引入适当的反馈控制信息，车辆速度波动变小或消失，系统不会出现严重的堵塞现象.这说明该双车道反馈控制模型能有效地抑制或缓解交通流堵塞. 关键词： 跟驰模型 双车道模型 反馈控制 堵塞抑制     

Calculation of multi-layer plate damper under one-axial load

A multi-layer damper with waved plates under one-axial load is considered. A method of theoretical calculation of its energy dissipation coefficient is proposed. An experimental research of own frequencies and vibration transfer ratios for different parameters of damper structure, harmonic vibration load and random load is performed. Results of this research are approximated by functions; it is possible to use these functions for the calculation of the damper too.     

利用节点效率评估复杂网络功能鲁棒性

为了克服现有复杂网络鲁棒性研究模型只考虑节点失效的局部影响性和网络拓扑鲁棒性的缺陷, 提出了一种利用节点效率来评估复杂网络功能鲁棒性的方法. 该方法综合考虑节点失效的全局影响性, 利用网络中节点的效率来定义各节点的负载、极限负载和失效模型, 通过打击后网络中最终失效节点的比例来衡量网络的功能鲁棒性, 并给出了其评估优化算法. 实验分析表明该方法对考虑节点负载的复杂网络功能鲁棒性的评定可行有效, 对于大型复杂网络可以获得理想的计算能力.     

基于STM32和MPU6050对车辆防盗追踪问题的设计

提出将防盗追踪器嵌入车轮,利用MPU6050获取被盗信息,GPS获取定位信息并将所获取的信息通过NRF2401发送给车主的方法,最终得到车辆被盗立即发出报警信号和追踪信息给车主的效果.     

基于云电视的数字图书馆服务探析

基于云电视的数字图书馆服务比传统数字图书馆服务有优势。图书馆要利用云电视的图书馆服务来开展远程教育服务,向用户发布信息,以及进行信息理疗和为特殊读者服务,以满足用户多元化的信息需求。     

Nonlinear propagation of pulses in multimode fiber with strong linear coupling

Multimode fiber has a richer spatial dimension than single-mode fiber, and is an ideal platform for studying many novel nonlinear effects. We established a strong linear coupling and short-range fiber model to understand the interactive effects of linear coupling and nonlinear effects. We find that strong linear coupling can compensate for the group delay between eigenmodes and cause energy fluctuation between modes which weakens the nonlinear effects. In high energy pulses, the interaction of linear coupling and nonlinear effects can help producing weak dispersion waves when the spectrum is broadened. Since linear coupling in a mode group is common and unavoidable, these results may provide a certain theoretical explanation for multi-mode nonlinear phenomena.     

异质栅氧化层轻掺杂漏石墨烯纳米条带p-i-n隧穿场效应管量子输运特性的研究

We perform a theoretical study of the effects of the lightly doped drain （LDD） and high-k dielectric on the performances of double gate p-i-n tunneling graphene nanoribbon field effect transistors （TFETs）. The models are based on non-equilibrium Green＇s functions （NEGF） solved self-consistently with 3D-Poisson＇s equations. For the first time, hetero gate dielectric and single LDD TFETs （SL-HTFETs） are proposed and investigated. Simulation results show SL-HTFETs can effectively decrease leakage current, sub-threshold swing, and increase on-off current ratio compared to conventional TFETs and Si-based devices; the SL-HTFETs from the 3p ＋ 1 family have better switching characteristics than those from the 3p family due to smaller effective masses of the former. In addition, comparison of scaled performances between SL-HTFETs and conventional TFETs show that SL-HTFETs have better scaling properties than the conventional TFETs, and thus could be promising devices for logic and ultra-low power applications.