Rechargeable Na–SO2 Battery with Ethylenediamine Additive in Ether‐Based Electrolyte

Rechargeable metal–SO₂ batteries have drawn tremendous attention because it can accelerate SO₂ fixation/utilization and offer high energy density. Herein, a rechargeable Na–SO₂ battery based on an ether‐based liquid electrolyte with an ethylenediamine (EDA) additive is realized via the reversible formation/decomposition of Na₂S₂O₄. Experimental investigations reveal that the EDA additive provides three benefits by simultaneously decreasing the overall electrode polarization, increasing the full discharge capacity, and improving battery cyclability. At a current density of 250 mA g^?1, the full discharge capacity of the battery with the EDA additive is more than twice of a similar system in the absence of EDA. In addition to the significantly enhanced capacity, the as‐assembled Na–SO₂ battery demonstrates excellent cyclic stability after 200 cycles, which is equivalent to a total duration of 1600 h. Moreover, the corrosion resistance of Na anode is strengthened with the aid of EDA in the SO₂‐containing liquid electrolyte. This work will pave the way for Na–SO₂ batteries as a promising battery technology toward both pollutant gas utilization and energy storage.     

Layered Silicon‐Based Nanosheets as Electrode for 4 V High‐Performance Supercapacitor

Silicon‐based materials have shown great potential and been widely studied in various fields. Unlike its unparalleled theoretical capacity as anodes for batteries, few investigations have been reported on silicon‐based materials for applications in supercapacitors. Here, an electrode composed of layered silicon‐based nanosheets, obtained through oxidation and exfoliation, for a supercapacitor operated up to 4 V is reported. These silicon‐based nanosheets show an areal specific capacitance of 4.43 mF cm^?2 at 10 mV s^?1 while still retaining a specific capacitance of 834 µF cm^?2 even at an ultrahigh scan rate of 50 000 mV s^?1. The volumetric energy and power density of the supercapacitor are 7.65 mWh cm^?3 and 9312 mW cm^?3, respectively, and the electrode can operate for 12000 cycles in a potential window of 4 V at 2 A g^?1, while retaining 90.6% capacitance. These results indicate that the silicon‐based nanosheets can be a competitive candidate as the supercapacitor electrode material.     

两种热电分离式MCPCB导热性能的对比研究

利用SMT工艺将两种功率不同的LED分别与设计完全相同的热电分离式铜基板及铝基板组装成模组,然后借助结温测试系统及积分球系统对两种金属基板的散热性能进行了对比研究。结果表明,热电分离式铜基板较之热电分离式铝基板仅具备微弱的散热优势,这种优势随着LED的功率增加有所扩大。当LED功率为9 W时,铜基板及铝基板所对应的LED模组热阻分别是3.16℃/W、3.26℃/W;当LED功率为15 W时,铜基板及铝基板所对应的LED模组热阻分别是2.33℃/W、2.46℃/W。     

基于IP网络的媒体点播系统设计

设计了基于IP网络的媒体点播系统,对媒体服务器的主要性能参数进行了测试,分析了在特定环境下影响服务器性能的主要原因,为优化媒体服务器提供了依据.     

基于部分校准极化敏感阵列的信号DOA和极化参数迭代估计

针对安装于飞机机翼上,具有不同结构极化敏感天线的部分校准阵列,该文提出了一种完全极化电磁波DOA和极化参数的迭代估计方法。该方法基于部分校准阵列,估计阵列误差;然后利用阵列误差,估计单个极化敏感天线的极化导向矢量;最后利用极化导向矢量,估计完全极化电磁波DOA和极化参数。迭代运行上述三步,可以逐步提高估计精度。计算机仿真验证了该方法是收敛的,并且具有良好的鲁棒性。     

自适应光电混合互连分流结构建模与性能分析

针对片上光电混合互连网络(hybrid optoelect ronic network-on-chip,HONoC)拥 塞控制与自适应能力差、无法实现光电联合仿真等问题,提出一种适用于可重构阵列处理器 的自适应光电混合互连分流结构,在此结构上设计了自适应分流路由算法与一种低损耗无阻 塞的5端口光路由器,并搭建了基于System verilog与Verilog的光电混合互连功能仿真与 性能统计模型。实验结果表明,在边缘节点阻塞的情况下所设计的路由算法避免拥塞能力平 均提升了17.5%,光路由器所需交叉波导与微环谐振器数量大幅减少,平均光路由器级插入 损耗仅为0.522 dB,所设计的光电混合互连性能统计模型具有支持 设计拓扑、结构和路由策 略等功能,并且可以对资源使用、功耗开销、插入损耗等性能进行统计分析。     

PFM开关电源集成电路的抗电磁干扰设计

针对脉冲频率调制(PFM)开关电源(SMPS)集成电路,提出了抗电磁干扰(EMI)设计的两种方法.通过采用零电流检测电路,控制开关电源集成电路中的开关金属氧化物半导体场效应晶体管(MOSFET)在第一个谷底导通,从而降低导通电流的尖峰值.通过采用恒压和恒流设计技术,使开关电源集成电路中的电压和电流得到限制,有助于降低电流纹波.采用CSMC lμm 40 V高压工艺设计了PFM开关电源集成电路SX1618,将以上两种抗电磁干扰设计方法应用在该电路的设计中,并设计了针对性的保护结构.完成SX1618整体仿真和版图设计后进行了流片和封装,并将其应用在实际的开关电源中,经测试,开关电源的抗电磁干扰能力符合标准.     

基于TMS320F206立体声数字测试仪的设计

研究了用DSP技术实现导频制立体声测试系统，提出了一种使用低档DSP芯片TMS3205206和高速A／D芯片MAX121，实现高精度立体声解码的方案。具有实现简单、抗干扰能力强、性能指标高、与数字显示电路接口设计方便等优点，达到了较高的性能／价格比。     

对EASE设计文件结构的探讨

了解EASE设计文件的构成对于认识和理解该软件的工作过程以及正确进行设计文件交流是十分必要的。文中探讨了EASE2．13和EASE3．0设计文件的结构、各构成文件特征及其相互关系，并结合应用中遇到的问题，给出了相应的建议。     

一种基于视觉的交通检测方法

在实际交通图像检测中检测系统要面对照度变化、局部遮挡和道路阴影等问题，针对这些问题提出一种基于视觉的检测方法，实验表明新方法对解决上述问题的有效性，并在计算车辆数量和速度方面有较高的精确度和较快的执行速度。