Structure optimization of polymeric Mach-Zehnder rib waveguide

The polymeric material is very promising for fabricating the integrated optical waveguide devices. The polymeric op- tical waveguide has become the hotspot because the poly- meric material can offer a series of merits, such as easy integration, rapid resp…     

弹性分组环(RPR)技术分析

弹性分组环(Resilient Packet Ring)技术是主要结合了SONET／SDH和以太网的优点而形成的一种基于分组交换的城域网技术。本从讨论SONET／SDH和以太网技术的优缺点中引出弹性分组环的出现背景、分析了RPR的技术特点和实现方法。     

10Gb/s 0.18μm CMOS光接收机前端放大电路

介绍了利用TSMC 0.18μm CMON工艺设计的应用于SDH STM-64速率级(10Gb/s)光接收机前端放大电路。该电路由前置放大器和作为主放大器的限幅放大器构成,其中前置放大器采用RGC形式的互阻放大器实现,限幅放大器采用改进的Cherry—Hooper结构。模拟结果表明该电路可以工作在10Gb/s速率上。     

全光网静态路由选择和波长分配的分层图算法

文章提出一种将路由选择和波长分配结合起来的启发式的路由选择和波长分配(RWA)算法．通过这种新的分层图算法和限制光跳距的加权系数来优化全光网的静态路由选择和波长分配，使建立光连接时所需的波长数达到最少．最后对实际的ARPANet等5种光网络进行了计算机仿真，证明了本算法比以前的算法有更好的性能．     

净化厂房的洁净度管理及节能运行实例

对生产量不断增加的净化车间洁净度，对失控采取措施，使车间的洁净度达到要求。在生产条件许可的情况下，改变空调运行的各项参数，达到节约大量电费的目的。     

基于移动代理技术网管模型性能的研究

随着网络运行结构的复杂和规模的不断扩大,基于客户/服务方式的网管模型已经不能适应网络管理的需要,基于移动代理的网络管理已经成为分布式网络管理的研究热点,本文主要分析了基于移动代理的网络管理结构模型,提出了一个实际的网络管理架构,并将它与传统的网络管理模型进行了比较分析,最后,进行了一些实验测试其性能指标。1     

电子标签辅助拣货系统的设计

传统的拣货方式由于速度慢、正确率低等原因已不能满足物流产业的飞速发展，本文提出一种用于辅助拣货的电子标签系统的设计方法，实现了计算机对整个拣货过程进行实时监控管理，提高了物流中心拣货的速度，且正确率可达99％以上。     

半导体集成化芯片系统基础研究——国家自然科学基金重大研究计划情况简介

简单介绍了国家自然科学基金重大研究计划———半导体集成化芯片系统基础研究的立项背景、2002年受理申请和评审概况,以及2003年申请指南。     

Construction of VS2/VOx Heterostructure via Hydrolysis-Oxidation Coupling Reaction with Superior Sodium Storage Properties

Heterostructure engineering is one of the most promising modification strategies for reinforcing Na⁺ storage of transition metal sulfides. Herein, based on the spontaneous hydrolysis-oxidation coupling reaction of transition metal sulfides in aqueous media, a VO_x layer is induced and formed on the surface of VS₂, realizing tight combination of VS₂ and VO_x at the nanoscale and constructing homologous VS₂/VO_x heterostructure. Benefiting from the built-in electric field at the heterointerfaces, high chemical stability of VO_x, and high electrical conductivity of VS₂, the obtained VS₂/VO_x electrode exhibits superior cycling stability and rate properties. In particular, the VS₂/VO_x anode shows a high capacity of 878.2 mAh g⁻¹ after 200 cycles at 0.2 A g⁻¹. It also exhibits long cycling life (721.6 mAh g⁻¹ capacity retained after 1000 cycles at 2 A g⁻¹) and ultrahigh rate property (up to 654.8 mAh g⁻¹ at 10 A g⁻¹). Density functional theory calculations show that the formation of heterostructures reduces the activation energy for Na⁺ migration and increases the electrical conductivity of the material, which accelerates the ion/electron transfer and improves the reaction kinetics of the VS₂/VO_x electrode.     

A Polymer Defect Passivator for Efficient Hole-Conductor-Free Printable Mesoscopic Perovskite Solar Cells

Due to the low cost and excellent potential for mass production, printable mesoscopic perovskite solar cells (p-MPSCs) have drawn a lot of attention among other device structures. However, the low open-circuit voltage (V_OC) of such devices restricts their power conversion efficiency (PCE). This limitation is brought by the high defect density at perovskite grain boundaries in the mesoporous scaffold, which results in severe nonradiative recombination and is detrimental to the V_OC. To improve the perovskite crystallization process, passivate the perovskite defects, and enhance the PCE, additive engineering is an effective way. Herein, a polymeric Lewis base polysuccinimide (PSI) is added to the perovskite precursor solution as an additive. It improves the perovskite crystallinity and its carbonyl groups strongly coordinate with Pb²⁺, which can effectively passivate defects. Additionally, compared with its monomer, succinimide (SI), PSI serves as a better defect passivator because the long-chained macromolecule can be firmly anchored on those defect sites and form a stronger interaction with perovskite grains. As a result, the champion device has a PCE of 18.84%, and the V_OC rises from 973 to 1030 mV. This study offers a new strategy for fabricating efficient p-MPSCs.