线极化径向线缝隙天线的设计

提出了线极化径向线缝隙天线（LP-RLSA）的设计方案．该天线是用于接收卫星直播电视（DBS）、甚小口径地球站（VSAT）、各种卫星地面移动体（包括车辆、船舶等）的高增益平板天线．在讨论了线极化径向线缝隙天线原理的基础上，完成了其计算机辅助设计和绘图．使用该方法给天线设计带来了方便，能灵活调整和优化缝隙排列，具有直观和精度高的优点．     

Gray photorefractive polymeric optical spatial solitons

We show that gray spatial optical solitons are possible in biased photorefractive polymers under steady-state conditions. We find that for a given material parameter the absolute value of a gray photorefractive polymeric soliton's phase decreases with an increase in the beam's grayness, whereas it increases with the material parameter for a given beam's grayness and that the full width half maximum (FWHM) of the gray soliton beam's intensity increases with the beam's grayness when the normalized background intensity and the material parameter are fixed and decreases with an increase in the normalized background intensity when the material parameter is fixed. On the other hand, we also show that N coupled beam evolution equations in biased photorefractive polymers can exhibit multicomponent gray solitons. These multicomponent gray solitons can be obtained provided that the N coupled beams share the same polarization, wavelength, and are incoherent with one another. The characteristics and stability properties of these multicomponent gray solitons are also discussed in detail.     

R相C60聚合物的磁性研究

在高温高压条件下利用高压合成装置合成了二维R相C60聚合物,并利用X射线衍射(XRD)和超量子干涉(SQUID)对合成的样品进行了研究.X射线衍射(XRD)数据表明,在6 Gpa压力和7000C-7250C的温度条件下合成的聚合物为纯度较高的二维R相C60聚合物,当温度升高至8000C时,富勒烯的笼状结构塌陷,样品全部变为无定形碳结构.超量子干涉(SQUID))数据表明,在富勒烯笼状结构出现破缺或共价键结构出现断裂的边界条件下制备的二维R相C60聚合物具有铁磁性,样品的磁性来源于破缺的C60分子笼和断裂的共价键.     

纳米晶聚合物复合薄膜PbTiO3-PEK-c的电光特性及其弛豫过程的研究

制备了掺杂型纳米晶聚合物钛酸铅聚醚醚酮 (PbTiO3 PEK c)复合薄膜 ,采用简单透射技术测量了该复合薄膜的线性电光系数 ,并研究了该复合薄膜的电光特性的弛豫过程     

EACVD中用氢原子谱线测定电子平均能量

采用蒙特卡罗方法，对EACVD中氢原子的发射过程进行了模拟。给出了由氢原子谱线测定电子平均能量的方法，结果对EACVD生长金刚石薄膜过程中实时监测电子平均能量，进而可以有效地控制工艺条件，生长出高质量的金刚石薄膜具有重要意义。     

3D打印贝壳仿生复合材料的拉伸力学行为

采用硬质和软质双组分材料,通过调控两种基体材料的装配夹角,采用光固化3D打印技术制备了不同装配方式的仿贝壳珍珠层复合材料,开展了准静态拉伸实验,结合扫描电镜观察,分析了其拉伸力学性能、断裂及能量耗散机理。研究结果表明,保持胞元边长不变,随着面内装配角度增加,仿贝壳珍珠层复合材料的强度呈线性增加趋势,断裂应变呈线性减小的趋势;随着面外装配角度增大,断裂应变呈线性减小趋势,而强度在面外装配角小于45°时呈增强趋势,超过45°时趋于稳定;面外装配角度为45°时,材料的强度达到最大值。试样在断裂前主要通过硬质材料的拔出、软/硬相界面处微裂纹的生成及微裂纹在扩展过程中的合并和偏转等方式耗散能量。     

Benzothiadiazole-based Conjugated Polymers for Organic Solar Cells

Benzothiadiazole(BT) is an electron-deficient unit with fused aromatic core, which can be used to construct conjugated polymers for application in organic solar cells(OSCs). In the past twenty years, huge numbers of conjugated polymers based on BT unit have been developed,focusing on the backbone engineering(such as by using different copolymerized building blocks), side chain engineering(such as by using linear or branch side units), using heteroatoms(such as F, O and S atoms, and CN group), etc. These modifications enable BT-polymers to exhibit distinct absorption spectra(with onset varied from 600 nm to 1000 nm), different frontier energy levels and crystallinities. As a consequence, BT-polymers have gained much attention in recent years, and can be simultaneously used as electron donor and electron acceptor in OSCs, providing the power conversion efficiencies(PCEs) over 18% and 14% in non-fullerene and all-polymer OSCs. In this article, we provide an overview of BTpolymers for OSCs, from donor to acceptor, via selecting some typical BT-polymers in different periods. We hope that the summary in this article can invoke the interest to study the BT-polymers toward high performance OSCs, especially with thick active layers that can be potentially used in large-area devices.     

一种用于电光开关的高速、高压电脉冲的产生

介绍了一种用于电光开关驱动源的高压超快电脉冲产生技术;电路采用级联的雪崩晶体管串和微波传输线结构,输出阻抗50Ω;在50Ω负载情况下,获得脉冲下降时间为1ns、幅度达到5kV、峰值电压为6.4 kV、幅度和半宽度稳定性优于2％、触发晃动为±15ps、触发延时为30 ns,脉冲峰值电流为128 A的高压高速大电流脉冲.     

传输线中脉冲信号反射波的测量和应用

将高频单脉冲信号输入同轴电缆，借助数字存储示波器记录输入、输出端的波形和相对延时，可以测量传输线的电缆长度和衰减系数，同时观察脉冲波形因色散引起的畸变．     

感生电场与动生电场的等效性探究

本文认为在感生电场的情况下,磁场的强弱变化可以引起磁场自身的横向运动,使得线圈中电子相对于磁场发生运动,从而等效为一个动生电场,受到洛伦兹力的作用.借助磁感线模拟磁场的运动方式,得到圆形回路中任意一点与磁场相对运动速度的表达式,进而推得该＂等效动生电场＂中的洛伦兹力.以螺线管为例,验证该方法可以解释感生电场所满足的规律.将感生电场与动生电场的产生原因统一为导体中电子与磁场的相对运动,相应电动势的非静电力统一为洛伦兹力.