移动便携式"黑广播"智能监测系统设计

本文阐述了我中心在建设"黑广播"监测系统中存在的主要问题,介绍了一种"移动便携收测前端"与"全维度、大数据、强扩展的监控平台(云平台部署)"智能监测方案,方案改变传统广播频率定点分布式监测系统的不足之处,实现"轻前端-重中心"的变革性思路来构建非法调频监测系统的模式.取得了部署成本低,方便维护,易于使用等主要成果.     

一种基于移动Agent的分布式通信算法

本文提出了一种基于移动Agent链接寻址分布式通信算法,通过分析通信位移延迟问题,对消息传递的寻址、消息排队的过程设置,实现了移动Agent的高速通信.     

Optical Fiber Type Slide Tactile Sensor Used for Underwater Robot

Bexause of the special underwater environment, many sensors used well in robots working in space or on the hand can not be used in the underwater.So an optical fiber type slide tactile sensor is designed by the inner modulation mechanism of the intensity type optical fiber.The principle and structure of the sensor are introduced in detail.The static and dynamic characteristics are analyzed theoretically and experimentally.The dynamic characteristic model is built and the simulation is made by using genetic algorithm based on neural network.In order to use the sensor perfectly, the recognition model of the sensor is built on the basis of the principle of “inverse solution”using neural networks.The control precision and sensitivity of the manipulator are improved.     

Comparison of GexSi1—x Grown by UHV／CVD from Si2H6／GeH4 and SiH4／GeH4

Using double crystal X-rays diffraction (DCXRD) and atomic force microscopy (AFM), the results of Ge x Si 1- x grown by UHV/CVD from Si 2H 6 and SiH 4 are analyzed and compared. Adsorbates can migrate to the energy-favoring position due to the slow growth rate from SiH 4. In this case, a Si buffer that isolates the effect of substrate on epilayer could not be grown, which results in a pit penetrating into epilayer and buffer. The FWHM is 0.055° in DCXRD from SiH 4. The presence of diffraction fringes is an indication of an excellent crystalline quality. The roughness of the surface is improved if grown by Si 2H 6; however, the crystal quality of the Ge x Si 1- x material became worse than that from SiH 4 due to much larger growth rate from Si 2H 6. The content of Ge is obtained from DCXRD, which indicates the growth rate from Si 2H 6 is largest, then GeH 4, and that from SiH 4 is least.     

含La或Sm的BaNd_(2-y)R_yTi_(4+x)O_(12+2x)瓷的结构与性能

ＢａＯ－Ｎｄ２Ｏ３－ＴｉＯ２系富钛区含Ｌａ或Ｓｍ的陶瓷,ＸＲＤ、ＳＥＭ显微结构分析表明,其主晶相为Ｒ（Ｒ＝Ｌａ或Ｓｍ）取代Ｎｄ固溶体ＢａＮｄ２－ｙＲｙＴｉ５Ｏ１４和ＢａＮｄ２－ｙＲｙＴｉ４Ｏ１２,均属斜方晶系,并存在少量的次晶相Ｒ２Ｔｉ２Ｏ７、ＢａＴｉ４Ｏ９、Ｂａ２Ｔｉ９Ｏ２０等。富钛区ＢａＮｄ２Ｔｉ４＋ｘＯ１２＋２ｘ（ｘ＝０～１．４００）组分和含Ｌａ或Ｓｍ的ＢａＮｄ２－ｙＲｙＴｉ５Ｏ１４组分所组成的瓷料,介质损耗显著地降低,介电常数和电容温度系数遵从李赫涅德凯对数混合定律。     

LUTGS晶体热释电系数和自发极化强度关系的研究

对属于铁电体的热释电体从德文希尔热力学理论模型出发,导出了热释电系数和自发极化强度的关系Ｐ／Ｘ＝Ｐｓ／Ｃ测量了ＬＵＴＧＳ晶体的ｐ／Ｘ和Ｐｓ／Ｃ分别随温度的变化曲线,发现两曲线有较好的一致性,但仍有差异。结合德文希尔热力学理论模型分析了其原因,指出了该关系对铁电体材料热释电性提高的指导意义。     

一个用于高速信号传输的对PVT变化不敏感的低功耗锁相环

介绍了一个用于高速信号传输的低功耗锁相环. 提出了一种新的开环校准方法. 该校准通过上电时候进行的开环数字校准很大程度上减轻了工艺变化对电路的影响,相比以前的闭环校准方法,该方法可以显著缩短校准时间. 在这个锁相环中采用了双环路的结构来获得对工艺、温度和环境变化不敏感的环路参数：例如衰减因子、相位裕度等. 还设计了一种新的鉴频鉴相器,它内嵌了电平转换的功能,简化了电路. 该PLL的设计通过小心的供电网络划分来降低电源噪声的耦合. 设计的锁相环路在输出为1.6GHz的时候均方根抖动为3.1ps,而仅消耗约为1mA的电流.     

二阶双通带频率选择表面的设计与验证

设计了一种具有良好带通性能的二阶双通带高阶频率选择表面(FSS)。该FSS结构是在两层介质板上加载三层金属层。利用仿真软件对FSS结构进行计算,并加工实验样件并测试。结果表明:这种三层FSS具有二阶双通带性能,它的3 dB通带分别为10.26~12.24 GHz和16.61~17.49 GHz,两通带平稳光滑,中心插损小,且对不同角度、不同极化方式入射的电磁波保持很好的稳定性。     

A Hierarchical 3D Graft Printed with Nanoink for Functional Craniofacial Bone Restoration

An ideal craniofacial bone repair graft shall not only focus on the repair ability but also the regeneration of natural architecture with occlusal loads-related function restoration. However, such functional bone tissue engineering scaffold has rarely been reported. Herein, a hierarchical 3D graft is proposed for rebuilding craniofacial bone with both natural structure and healthy biofunction reconstruction. Inspired by the bone healing process, an organic–inorganic nanoink with ultrasmall calcium phosphate oligomers and bone morphogenetic protein-2 incorporated is developed for spatiotemporal guidance of new bone. Based on such homogeneous nanoink, a biomimetic graft, including a cortical layer containing Haversian system, and a cancellous layer featured with triply periodic minimum surface macrostructures, is fabricated via projection-based 3D printing method, and the layers are loaded with distinct concentrations of bioactive factors for regenerating new bone with gradient density. The graft exhibits excellent osteogenic and angiogenic potential in vitro, and accelerates revascularization and reconstructs neo-bone with original morphology in vivo. Benefiting from such natural architecture, loading force is widely transferred with reduced stress concentration around the inserted dental implant. Taken from native physiochemical and structural cues, this wstudy provides a novel strategy for functional tissue engineering through designing function-oriented biomaterials.     

5G毫米波通信用低插损高隔离GaAs PHEMT单刀双掷开关

基于0.15μm GaAs赝配高电子迁移率晶体管(PHEMT)工艺,实现了一款用于5G毫米波通信的低插损高隔离单刀双掷(SPDT)开关芯片。为了降低插损,每个开关支路通过四分之一波长阻抗变换器连接到天线端,并通过优化传输线和器件总栅宽实现了良好的端口匹配;为了提高隔离度,采用了三并联多节枝的分布式架构形成高的输入阻抗状态,实现信号的全反射。芯片面积为2.1 mm×1.1 mm。在片测试结果显示,在24.25~29.5 GHz的5G毫米波频段内该SPDT开关实现了小于1.1 dB的极低插损和大于32 dB的高隔离度,1 dB压缩点输入功率大于26 dBm。