2~4 GHz宽带高效率功放的设计

针对宽带高效率功放的设计要求,基于宽带匹配网络设计了一款GaN宽带高效率功率放大器,其工作频率覆盖整个S波段。仿真结果显示,该功放在整个S频段内漏极效率(DE)大于62%,功率附加效率(PAE)大于57%,增益大于10.6 dB。实测结果表明,该功放在整个频段内DE大于54%,PAE大于48%,增益大于9 dB,增益平坦度在1 dB以内,实现了S波段高效率宽带功率放大器的设计。     

Design and optimization of a monolithic GaInP/GaInAs tandem solar cell

We have theoretically calculated the photovoltaic conversion efficiency of a monolithic dual-junction GaInP/GaInAs device,which can be experimentally fabricated on a binary GaAs substrate.By optimizing the bandgap combination of the considered structure,an improvement of conversion efficiency has been observed in comparison to the conventional GaInP_2/GaAs system.For the suggested bandgap combination 1.83 eV/1.335 eV,our calculation indicates that the attainable efficiency can be enhanced up to 40.45%(30...     

阜新市供水工程水厂中的变电站(所)监控系统及马达管理中心

本文简要介绍了变电站监控系统的配置、软件。变电站监控系统能够满足一个变电站现在或将来的全部要求。系统被设计成一个开放的系统,除了提供标准化的数据转换处理功能外,还具有独特的用户接口,能够对系统的特别任务提供集成。由于有先进的诊断功能,它还能提供理想的调试和维护功能。由于具有开放完备的文件,以及经测试的系统,所以具有结构清晰、性能可靠的特点,而且硬件模块化,互换性强。     

Ionic liquids in perovskite solar cells

Metal halide perovskites have gained a lot of attention par-ticularly in recent years due to their excellent optoelectronic properties and simple scalable processability[1-3].One major application of halide perovskites is solar cells,however,des-pite the power conversion efficiencies(PCEs)have already reached around 25％[4,5],the long-term stability issue of such devices still impedes their commercialization.Ionic liquids,which contain a large asymmetric organic cation and an organ-ic or inorganic anion,have recently been applied to per-ovskite solar cells(PSCs),not only increasing the efficiency but also remarkably improving the long-term stability[6,7].     

神光Ⅱ升级装置中靶室系统的稳定性设计与分析

从提高结构稳定性的基本理论出发,给出了神光Ⅱ升级惯性约束聚变(ICF)靶室系统的初始结构方案,并利用有限元方法(FMM)对其进行模态分析,找出靶室系统初始结构的薄弱环节,进而对初始方案进行结构稳定性优化,最后对优化方案进行稳定性分析.优化与分析结果表明,当靶室的壁厚T为50 mm,靶室支脚与垂直方向夹角θ为27.2°,支脚之间布置厚度B为20 mm筋板,筋板空间距离H为120 mm时,靶室系统可以获得很好的稳定性,随机激励作用下的平移均方根值为1.425μm,满足神光Ⅱ升级装置对靶室系统的稳定性指标.     

Formation of stacked ruthenium nanocrystals embedded in SiO2 for nonvolatile memory applications

n metal oxide semiconductor (MOS)capacitors fabricated by the former method, which are much better than 4.6 Ⅴ and no window remaining after one year observed in the latter. The former method is compatible with conventional CMOS technology.     

具有柔性铰链的差式微位移放大机构

阐述了差式微位移放大机构的基本设计原理,分析了机构中位移损失的原因。研制的放大机构具有较好的放大效果,而且机构的位移输出线性特性也较好。采用片状柔性铰链成功地解决了由于机构中的位移干涉造成的机构内部反力太大的问题。     

某型车载电台强电磁脉冲环境效应仿真和试验

为检验某型车载通信超短波电台在高空核电磁脉冲环境下的生存能力,对该型电台建立全尺寸模型,进行了电磁脉冲耦合仿真分析,对比了该电台鞭状天线的前门耦合以及各互连线缆的后门场线耦合电流量级,得到前门耦合大于后门耦合的结论.结合仿真结果,对电台的强电磁脉冲环境适应性试验方法进行了设计,并采用威胁级辐照方法,采用垂直极化的电磁脉...     

Investigation of optical and electronic properties in Al–Sn co-doped ZnO thin films

Al-Sn co-doped ZnO thin films were deposited onto quartz substrates by sol-gel processing. The surface morphology and electrical and optical properties were investigated at different annealing temperatures. The surface morphology showed a closely packed arrangement of crystallites in all the doped films. As prepared co-doped films show a preferred orientation along an (0 0 2) plane. This preferred orientation was enhanced by increasing the annealing temperature to between 400 °C and 500 °C, but there was a shift to the (1 0 1) plane when the annealing temperature rose above 500 °C. These samples show, on average, 91.2% optical transmittance in the visible range. In this study, the optical band gap of all the doped films was broadened compared with pure ZnO, regardless of the different annealing temperature. The carrier concentration and carrier mobility of the thin films were also investigated.     

Recent Development of Jumping Motions Based on Soft Actuators

Drawing inspiration from the jumping motions of living creatures in nature, jumping robots have emerged as a promising research field over the past few decades due to great application potential in interstellar exploration, military reconnaissance, and life rescue missions. Early reviews mainly focused on jumping robots made of lightweight and rigid materials with mechanical components, concentrating on jumping control and stability. Herein, attention is paid to the jumping mechanisms of soft actuators assembled from various soft smarting materials and powered by different stimulus sources. The challenges and prospects of soft jumping actuators are also discussed. It is hoped that this review will contribute to the further development of soft jumping actuators and broaden their practical applications.