DC Electrical Conductivity of the Direct Electrochemically Synthesized Polythiophene Metal Complexes

Electrochemical anodic oxidation of a metal anode in an acetone solution of 2,5-diamino-3,4-dicyanothiophene gave the polythiophene metal complexes of Co, Ni, Cu, Zn, Cd, and Sn. Chemical analyses, as well as FTIR and electronic spectral data, are presented to confirm the formulation of the isolated materials. DC electrical conductivity measurements of the polymer complexes were measured in the range 300–500 K in the annealed and 5% doped forms. The products gave electrical conductivity in the semi-conducting region that increased by heat.     

Compensating the effects of DC bias lines on terahertz photomixer antennas using resistively loaded lines

This paper proposed a method, namely resistively loaded lines (RLL), to compensate the effects of the DC bias lines after investigating its effects on several types of antennas for terahertz photomixers. The RLL is formed by placing lumped resistances periodically on the DC bias line in order to cease the leakage current virtually, which cause a significant amount of distortion on the antenna performance. The simulation results of the dipole, folded dipole, log-periodic, and spiral antennas show that RLL almost removes the effects of the bias lines and improves the antenna radiation resistance and radiation pattern notably compared with that of the commonly used bias line types, such as coplanar stripline and photonic bandgap type bias lines.     

热循环加载条件下焊点形态参数对板级光互连模块对准偏移影响分析

建立光互连模块有限元分析模型并进行热循环加载有限元分析,获取了垂直腔面发射激光器(Vertical Cavity Surface Emitting Laser,VCSEL)与耦合元件间的位置偏移;采用正交实验设计法设计了不同焊点结构参数组合并建立有限元模型,计算相应焊点形态参数组合下的位置偏移数据并进行方差分析.结果表明:在一个热循环周期内低温保温结束时刻位置偏移最大;外端光通道的位置偏移比中间光通道的偏移值大;在置信度为95%时VCSEL焊点高度对对准偏移具有显著影响,因素显著性排序由大到小依次为:VCSEL焊点高度、陶瓷基板焊点高度、VCSEL焊点体积和陶瓷基板焊点体积;单因子变量分析表明,位置偏移随VCSEL焊点高度增加而增大.     

脉冲反应磁控溅射氧化钒薄膜的电学性能研究

室温下,采用脉冲直流反应磁控溅射技术在玻璃衬底上制备了氧化钒薄膜.研究了脉冲调制功率占空比对薄膜物相、表面形貌、组分和热敏电学性能的影响.X射线衍射测试结果表明在室温及不同占空比下生长的氧化钒薄膜均为非晶结构;原子力显微镜表面形貌测试表明降低占空比可以得到更加光滑的薄膜表面;X射线光电子能谱测试表明降低占空比能够在反应溅射气氛不变的情况下促进钒的氧化;对薄膜的热敏电学特性测试发现,在293～368 K,小极化子跳跃是脉冲反应磁控溅射氧化钒薄膜中主要的导电机制.     

AEQ数字调音台维护及温度监测系统

我台广播设备数字化改造已经多年,改造核心设备AEQ数字调音台等由于使用年限增加故障率也逐年上升,对于广播安全播出是重大的隐患。针对AEQ调音台故障特点,探索出AEQ数字调音台的维修方法以及改进之处,并设计开发基于物联网技术对调音台等重要数字设备多点实时监测系统。     

光伏系统DC/DC变换器设计与仿真

本次研修主要针对整个光伏发电系统前端的DC/DC转换器部分进行研究、设计和仿真。此部分不仅要根据设计要求设计选择合理的占空比和元件参数,完成DC/DC变换,还需要考虑最大能量跟踪控制,以保证最大可能的利用能源,提高系统效率。     

数模混合高速集成电路封装基板协同设计与验证

介绍了数模混合高速集成电路(IC)封装的特性以及该类封装协同设计的一般分析方法.合理有效的基板设计是实现可靠封装的重要保障,基于物理互连设计与电设计协同开展的思路,采用Cadence APD工具以及三维电磁场仿真工具实现了特定数模混合高速集成电路(一款探测器读出电路)的封装设计与仿真论证,芯片封装后组装测试,探测器系统性能良好,封装设计达到预期目标.封装电仿真主要包含:封装信号传输通道S参数提取、电源/地网络评估,探测器读出芯片封装体互连通道设计能满足信号带宽为350 MHz(或者信号上升时间大于1 ns)的高速信号的传输.封装基板布线设计与基板电设计协同分析是提高数模混合高速集成电路封装设计效率的有效途径.     

基于模糊控制的电动汽车再生制动系统的研究

再生制动能够降低能源的消耗量和延长电动汽车的行驶里程。它广泛的受到诸多学者的关注。本文提出了一个新颖的再生制动控制系统。该系统基于无刷直流电机的控制特性和电动汽车刹车时的制动特性,直流无刷电机采用传统的PID控制,刹车力采用模糊逻辑控制,刹车力矩可以由PID控制器实时的控制。通过Matlab/Simulink软件,仿真分析了电池的充电状态、制动力和直流侧线电流。实验和仿真结果均证实了在具有良好的刹车性能的前提下,该方法可以实现良好的再生制动性能和延长电动汽车的行驶里程,在工程上更加易于实现也具有更好的鲁棒性和更高的效率。     

应用于升压型DC-DC的新颖软启动电路的设计

提出了一种新颖的软启动电路,实现了输出电压无过冲平滑启动。该电路有效抑制了DC-DC开关电源上电启动过程出现的浪涌电流和输出电压的过冲,同时该软启动电路克服了传统软启动电路无法带载启动的缺点。电路完全集成在芯片内部,避免了使用额外电容而占用过多面积。利用Cadence Spectre仿真平台对电路进行了仿真验证,仿真结果表明,在输入电压为2.4~4.2 V的同步升压DC-DC芯片中,负载在0~2.1 A范围内启动,均未出现电感电流和输出电压的过冲。     

The Synthesis,Characterization and DC Electrical Conductivity of Polypyrrole‐Zirconium Complex

Polypyrrole‐zirconium complex has been synthesized by reacting 2‐amino‐3,4‐dicyano‐5‐mercaptopyrrole with zirconium nitrate in absolute ethanol under reflux for 24 h. The product has been characterized by elemental analyses, FTIR spectroscopy, in addition to thermal analysis (TGA and DSC) and its solubility has been investigated. The DC electrical conductivity variation of polypyrrole‐zirconium complex has been studied in the temperature range 300–500 K after annealing for 24 h at 100°C and doping with I₂, FeCl₃ and CuCl₂ · H₂O for comparison. An attempt has been made to interpret the DC electrical conductivity behavior and thermal properties to chain length, dopant used, polymer structure and attached groups.