不同功率氮激光穴位照射镇痛作用研究

作者以不同功率的氮澈光对大白鼠分组进行穴位照射。照射前后测痛，照射后动物痛阈都有提高，说明不同功率的氮激光均有镇痛作用。高、低功率氮澈光穴位照射后动物产生的痛阈变化经统计学处理，差异性不显著。提示使用低功率氮激光同样可达提高痛阈的目的。     

长电缆传输引起的电机端口过电压的研究

电机与变频器通过长线电缆连接时．会在电机端口产生过电压,威胁电机的安全运行。本文在分析电机端口过电压产生机理的基础上,采用机侧滤波器抑制电机端口电压。利用MatIab／SimuIink建立仿真模型对其进行仿真分析,仿真结果验证了电机端口电压分析的正确性和所设计滤波器的有效性。     

基于有线网络的统一智慧业务云平台设计及实现

本文论述如何搭建统一智慧业务云平台,为地市、区县分公司提供统一的智慧业务平台支撑,可实现门户展现快速上线、数据对接、应用管理等轻量级信息发布类应用,促进有线网络运营商政企业务的发展.     

Recent Progress in Advanced Tactile Sensing Technologies for Soft Grippers

Tactile sensing technology is crucial for soft grippers. Soft grippers equipped with intelligent tactile sensing systems based on various sensors can interact safely with the unstructured environments and obtain precise properties of objects (e.g., size and shape). It is essential to develop state-of-the-art sensing technologies for soft grippers to handle different grasping tasks. In this review, the development of tactile sensing techniques for robotic hands is first introduced. Then, the principles and structures of different types of sensors normally adopted in soft grippers, including capacitive tactile sensors, piezoresistive tactile sensors, piezoelectric tactile sensors, fiber Bragg grating (FBG) sensors, vision-based tactile sensors, triboelectric tactile sensors, and other advanced sensors developed recently are briefly presented. Furthermore, sensing modalities and methodologies for soft grippers are also described in aspects of force measurement, perception of object properties, slip detection, and fusion of perception. The application scenarios of soft grippers are also summarized based on these advanced sensing technologies. Finally, the challenges of tactile sensing technologies for soft grippers that need to be tackled are discussed and perspectives in addressing these challenges are pointed out.     

负阻异质结晶体管的模拟与实验

采用MBE方法生长了8nm基区的InGaP/GaAs双异质结材料,研制成具有负阻特性的异质结晶体管.在恒压恒流条件下均观察到了负阻特性并对其物理机制进行了讨论.推导出集电极电流Ic与VCE的关系表达式,讨论了负阻与器件结构和参数的关系.使用PSPICE模拟软件建立电路网表模型,代入推导出的IC-VCE公式进行模拟,模拟结果与器件的测量结果十分接近.     

Integrated folding 4/spl times/4 optical matrix switch with total internal reflection mirrors on SOI by anisotropic chemical etching

A folding rearrangeable nonblocking 4/spl times/4 optical matrix switch was designed and fabricated on silicon-on-insulator wafer. To compress chip size, switch elements (SEs) were interconnected by total internal reflection (TIR) mirrors instead of conventional S-bends. For obtaining smooth interfaces, potassium hydroxide anisotropic chemical etching of silicon was utilized to make the matrix switch for the first time. The device has a compact size of 20/spl times/1.6 mm/sup 2/ and a fast response of 7.5 /spl mu/s. The power consumption of each 2/spl times/2 SE and the average excess loss per mirror were 145 mW and -1.1 dB, respectively. Low path dependence of /spl plusmn/0.7 dB in total excess loss was obtained because of the symmetry of propagation paths in this novel matrix switch.     

SOI光波导和集成波导光开关矩阵

报道了基于SOI (silicon-on-insulator）材料的光波导和集成波导光开关矩阵的最新研究进展. 给出了截面为梯形的脊波导的单模条件，设计制备了MMI (multimode interference）集成耦合器和基于Mach-Zehnder光波导干涉仪的热光型2×2光开关，开关转换速度达到了5～8μs，驱动功耗仅为140mW，是当前国际上同类型光开关中转换速度最快的. 在此基础上制备成功了4×4波导光开关矩阵，并实现了光信号在不同信道间的转换.     

光纤放大器及其对光纤传输系统的影响

本文在简要介绍光纤放大器的种类、应用及参数后，比较详细地分析了光纤放大器对光纤传输系统的各种影响以及解决的途径。     

基于DeltaV的聚丙烯装置控制系统设计

本文对FISHER-ROSEMOUNT公司DeltaV系统的特点、系统配置进行了介绍,同时结合DeltaV系统在兰港公司聚丙烯装置的应用情况,介绍其典型控制功能的实现。并简要的说明了DeltaV系统中PLM顺序块逻辑控制的功能,及5组下料控制程序的实现。使用情况表明,DeltaV系统完全满足装置的控制和使用要求。