摘要：A surface plasmon resonance(SPR) sensor based on a multi-core photonic crystal fiber(PCF) is presented in this *** is only one analyte channel positioned in the center of the PCF cross section,rather than several closely arranged analyte channels around the central *** the design of this sensor not only reduces the consumption of gold and samples,but also effectively avoids the interference between neighboring analyte *** field distributions of this fiber at different wavelengths and the sensing properties of this sensor are theoretically analyzed and discussed using finite element method(FEM).Simulation results confirm that both the thickness of metallic layer and the fiber structural parameters have significant effect on sensing *** amplitude sensitivity of the sensor is found to be 1.74×10-5RIU,and the spectral sensitivity is 3300 nm/RIU,corresponding to a resolution of 3.03×10-5 ***,in order to achieve PCF-SPR sensing characteristics,an experiment design scheme based on spectroscopic detection method is proposed.

摘要：利用3维高频软件设计了一种用于S波段大间隙速调管的膜片加载大间隙单重入输出腔,建立了带大耦合孔的输出腔3维全结构模型,采用3维PIC程序对输出腔的提取效果进行了粒子模拟。研究结果表明:膜片加载的大间隙单重入输出腔开大耦合孔后,其所有谐振频点的场分布都不再是TM011模式,因此,在设计此类输出腔时不能以工作频点是否谐振为优化目标。提出了大间隙输出腔设计原则,根据设计原则优化后的输出腔可稳定提取1.07 GW的平均功率,提取效率约35.7%。

摘要：研制了一种结构紧凑、电压升压倍数高达109倍的200 kV级脉冲变压器,以实现高压脉冲变压器的小型紧凑化。用电磁理论分析、电路模拟及实验测试3种方法对变压器的耦合、耐压和输出特性进行了研究,对重要参数进行了计算和设计。采用晶粒取向硅钢薄带作为变压器磁芯,且磁芯闭合,变压器的有效耦合系数高达0.95以上。高分子材料的绝缘套筒结构和分层交替的绕线方式,使得变压器在初级低压充电2.1kV时,次级可输出幅度为230 kV、半高全宽为3μs的高电压脉冲。模拟和实验结果验证了理论设计的合理性。

摘要：This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless *** amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) *** enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy *** common source inductive degeneration method is employed here to enhance the gain of *** amplifier produces a gain of more than 17 dB and noise figure of about 0.5 *** lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of *** Advance Design System(ADS) is used for the design and simulation *** the layout of design is developed on the FR4 substrate.

摘要：采用自行设计的基于大规模可编程门阵列(FPGA)结构的控制电路,实现了4路光纤激光的多抖动法相干合成。对大气湍流和机械振动引起的相位噪声进行了有效补偿,使远场光斑条纹对比度由开环时的0.21提高到了闭环时的0.93,闭环时远场特定孔径内的能量较开环时提高了3.3倍。该方法还对人为抖动光纤引起的较高频率噪声具有很好的抑制作用,系统闭环后,远场光斑条纹对比度可达到0.72。

摘要：Wire-shaped supercapacitors（SCs） possessing light-weight, good flexibility and weavability have caught much attention, but it is still a challenge to extend the lifespan of the devices with gradual aging due to the rough usage or external factors. Herein, we report a new stretchable and selfhealable wire-shaped SC. In the typical process, two polyvinyl alcohol/potassium hydroxide（PVA/KOH） hydrogel wrapped with urchin-like NiCo2O4 nanomaterials were twisted together to form a complete SC devices. It is noted that the as-prepared PVA hydrogel can be easily stretched up to 300% with small tensile stress of 12.51 kPa, superior to nearly 350 kPa at 300%strain of the polyurethane. Moreover, the wire-like SCs exhibit excellent electrochemical performance with areal capacitance of 3.88 mF cm^-2 at the current density of 0.053 mA cm^-2, good cycling stability maintaining 88.23% after 1000 charge/discharge cycles, and 82.19% capacitance retention even after four damaging/healing cycles. These results indicate that wireshaped SCs with two twisted NiCo2O4 coated polyvinyl alcohol hydrogel fibers is a promising structure for achieving the goal of high stability and long-life time. This work may provide a new solution for new generation of self-healable and wearable electronic devices.

摘要：A simple self-catalyzed chemical vapor deposition process was conducted to synthesize single-crystalline GaSb nanowires,where Ga droplets were utilized as the *** as-grown GaSb nanowires exhibited typical p-type semiconductor behavior with the calculated hole mobility of about 0.042 cm^2 V^-1 s^-*** photoresponse properties of the GaSb nanowires were studied by fabricating nanowire photodetectors on both rigid and flexible *** results revealed that the photodetectors exhibited broad spectral response ranging from ultraviolet,visible,to near-infrared *** the device on rigid substrate,the corresponding responsivity and the detectivity were calculated to be 3.86×10^3 A W-1 and 3.15×10^13 Jones for 500 nm light,and 7.22×10^2 A W-1 and 5.90×10^12 Jones for 808 nm light,respectively,which were the highest value compared with those of other reported Ga1-xInxAsySb1-y structure ***,the flexible photodetectors not only maintained the comparable good photoresponse properties as the rigid one,but also possessed excellent mechanical flexibility and *** study could facilitate the understanding on the fundamental characteristics of self-catalyzed grown GaSb nanowires and the design of functional nano-optoelectronic devices based on GaSb nanowires.

摘要：We develop a low frequency fiber Fabry–Perot(F-P)seismometer based on transfer function *** seismometer structure and demodulation system accuracy are limitations of low frequency seismic *** transfer function of the F-P seismometer is analyzed,and the mass displacement spectrum(MDS)is *** provides guidance for mechanical structure design and optical interferometer analysis to achieve low *** F-P seismometer prototype is *** experiment shows that the prototype has an average noise of 6.74 ng=p Hz below 50 Hz,and its noise is less than that of the global new high noise model within 0.16–50 Hz,whose potential is considerable.