Low-power survivor memory architecture for DFSE in 1000BASE-T transceiver

A novel approach to survivor memory unit of Decision Feedback Sequence Estimator （DFSE） for 1000BASE-T transceiver based on hybrid architecture of the classical register-exchange and trace-back methods is proposed. The proposed architecture is investigated with special emphasis on low power and small decoder latency, in which a dedicated register-exchange module is designed to provide tentative survivor syml~ols with zero latency, and a high-speed trace back logic is presented to meet tile tight latency budget specified for 1000BASE-T transceiver. Furthermore, clock-gating register banks are constructed for power saving. VLSI implementation reveals that, the proposed architecture provides about 40% savings in power consumption compared to the traditional register-exchange architecture.     

Investigation of the impact of the rear‐dielectric/silver back reflector design on the optical performance of thin‐film silicon solar cells by means of detached reflectors

Thin‐film silicon solar cells often rely on a metal back reflector separated from the silicon layers by a thin rear dielectric as a back reflector (BR) design. In this work, we aim to obtain a better insight into the influence of the rear‐dielectric/Ag BR design on the optical performance of hydrogenated microcrystalline silicon (µc‐Si:H) solar cells. To allow the application of a large variety of rear dielectrics combined with Ag BRs of diverse topographies, the solar cell is equipped with a local electrical contact scheme that enables the use of non‐conductive rear dielectrics such as air or transparent liquids of various refractive indices n. With this approach, detached Ag BRs having the desire surface texture can be placed behind the same solar cell, yielding a direct and precise evaluation of their impact on the optical cell performance. The experiments show that both the external quantum efficiency and the device absorptance are improved with decreasing n and increasing roughness of the BR. Calculations of the angular intensity distribution of the scattered light in the µc‐Si:H are presented. They allow for establishing a consistent picture of the light trapping in the solar cell. Copyright © 2013 John Wiley & Sons, Ltd.     

最新水冷式全固态数字调幅600kW中波发射机

数字调幅制式是当前国际上较先进的调制技术，ＤＸ系列全固态数字调幅中波发射机的电声指标和工业效率都是很先进的，过去的ＤＸ大功率机采用风冷方式，本文介绍了最新水冷ＤＸ－６００发射机的设备情况和技术特点。     

微波能应用的回顾和展望

回顾二十年来微波能应用成功的实例，并展望多学科对微波功率应用迫切需求，有着丰富的内容。     

地下隧道中电力电缆的线路阻抗矩阵相序阻抗矩阵和参数的分析

在研究电力电缆发生短路对周围通讯系统的危险影响时,短路电流的分布和入地电流系数的计算是至关重要的,这必然涉及线路阻抗,相序相抗和自互阻抗等参数,文章给出了电缆线芯不换位,金属护套交叉互联两端接地系统的线路阻抗矩阵,相序阻抗矩阵的直观表达式,分析了它们的一些性质,介绍了隧道中电缆参数的一种分析方法,即虚拟媒质法,应用该法可以方便地处理道空气区对其自互阻抗的影响,由于该法是数值方法,隧道横截面形状可以     

倒灌河道水位流速计算方法研究

针对在大河倒灌情况下,如何确定跨越支流的桥梁设计桥高和桥下设计流速的问题,建立了基于完全圣维南方程组的水力学模型,通过物理模型试验,将所得结果配数学模型的计算结果加以比较,结果表明两者较为吻合,还给出了大河水位涨落时支流汇入大河处的最大流速的经验公式,对为数众多的中小河流的桥梁设计具有较好的参考作用。     

悬停状态桨尖形状对中小型旋翼的影响

针对悬停状态中小型飞行器气动性能,考虑桨尖涡对飞行器桨叶桨尖的影响,分析了不同形状桨尖桨叶气动特性及其变化规律。尖削桨尖旋翼可有效削弱桨尖涡,从而降低旋翼的阻力距。桨尖涡导致桨尖处下洗速度减小,使桨尖处桨叶截面翼型的实际迎角增大。随着转速的提高,桨尖雷诺数的增大,尖削桨尖的优势才逐渐体现。     

光栅反馈频率可调谐扩展腔半导体激光器

为了实现半导体激光器在795nm处的单模输出,采用输出端面镀有增透膜的半导体激光二极管作光源,用光栅反馈的方法构成扩展腔,研制了波长为795nm、频率可调谐半导体激光器,并对该激光器进行了实验测试,可知其频率连续调谐范围约7.6GHz,激光线宽约为2.5MHz,运行在110mA时输出功率达43mW。结果表明,该半导体激光器可用于激光与铷原子相互作用中的量子相干效应的研究。     

PDSOI nMOSFETs关态击穿特性

分别采用不同的背栅沟道注入剂量制成了部分耗尽绝缘体上硅浮体和H型栅体接触n型沟道器件.对这些器件的关态击穿特性进行了研究.当背栅沟道注入剂量从1.0×1013增加到1.3×1013cm-2,浮体n型沟道器件关态击穿电压由5.2升高到6.7V,而H型栅体接触n型沟道器件关态击穿电压从11.9降低到9V.通过测量寄生双极晶体管静态增益和漏体pn结击穿电压,对部分耗尽绝缘体上硅浮体和H型栅体接触n型沟道器件的击穿特性进行了定性解释和分析.     

基于误差反向传播的入侵检测系统的研究

构建了一种基于误差反向传播神经网络的入侵检测系统总体架构,分析了该系统的各组成模块和功能要求.重点阐述了基于误差反向传播的入侵检测分析模块的设计方案,研究入侵分析过程中的几个关键问题并给出了解决方法.最后给出了基于误差反向传播网络的检测算法流程.