DC～1．5GHz GaAs单片集成跨阻放大器

介绍一种采用８个砷化镓ＦＥＴ和７个二极管的单片集成跨阻放大器，其结果良好，频率为ＤＣ～１．５ＧＨｚ，增益Ｇａ≥１８ｄＢ，噪声系数Ｆｎ≤４．３ｄＢ（ｆ＝４００ＭＨｚ，Ｒｓ＝Ｒ＿Ｌ＝５０Ω）。     

教研融合的射频微波与电磁兼容科研平台

本文提出建设射频微波与电磁兼容的高水平科研平台。充分利用高水平科研平台建设中的资金优势、人才优势,以科研与教学有机结合为指导思想,通过分析教研融合科研平台建设的发展动力,探索了教研融合科研平台建设的主要措施,推动科学研究真正融入高等教育,为教研融合与地方高校学科建设协同发展提供借鉴。     

Integration of InGaP/GaAs/Ge triple‐junction solar cells on deeply patterned silicon substrates

We report preliminary results on InGaP/InGaAs/Ge photovoltaic cells for concentrated terrestrial applications, monolithically integrated on engineered Si(001) substrates. Cells deposited on planar Ge/Si(001) epilayers, grown by plasma‐enhanced chemical vapor deposition, provide good efficiency and spectral response, despite the small thickness of the Ge epilayers and a threading dislocation density as large as 10⁷/cm². The presence of microcracks generated by the thermal misfit is compensated by a dense collection grid that avoids insulated areas. In order to avoid the excessive shadowing introduced by the use of a dense grid, the crack density needs to be lowered. Here, we show that deep patterning of the Si substrate in blocks can be an option, provided that a continuous Ge layer is formed at the top, and it is suitably planarized before the metalorganic chemical vapor deposition. The crack density is effectively decreased, despite that the efficiency is also lowered with respect to unpatterned devices. The reasons of this efficiency reduction are discussed, and a strategy for improvement is proposed and explored. Full morphological analysis of the coalesced Ge blocks is reported, and the final devices are tested under concentrated AM1.5D spectrum. Copyright © 2016 John Wiley & Sons, Ltd.     

宽带城域网及其增值业务

城市信息化离不开城市信息高速公路 ,宽带城域网的建设为城市信息化提供了高速通道。IP网和ATM网将是宽带城域网的核心平台 ,宽带接入技术将成为城域网接入的主要手段 ,宽带城域网整体解决方案离不开IP软技术的应用 ,三网融合将是宽带城域网发展方向。增值业务是网络不断发展的动力所在     

用CPLD电路实现激光引信电路系统小型化设计

激光引信小型化是激光引信的关键技术。文中阐述了应用ＣＰＬＤ技术实现激光引信电路系统小型化设计。介绍了器件和软件的选取,描述了用Ｖｉｅｗｌｏｇｉｃ公司的Ｗｏｒｋｖｉｅｗ Ｏｆｆｉｃｅ软件实现激光引信数字电路部分的高度集成过程、设计思路、输入方法、功能仿真、时序仿真和Ｖａｎｔｉｓ器件的生成,并指出了设计过程中应注意的问题。同时,给出了一些解决方法。最后,把用ＴＴＬ器件完成的电路和用ＣＰＬＤ器件完成的电     

On Multiple Traffic Type Integration over Wireless TDMA Channels with Adjustable Request Bandwidth

A new medium access control (MAC) protocol for mobile wireless communications is presented and investigated. We explore, via an extensive simulation study, the performance of the protocol when integrating voice, video and data packet traffic over a wireless channel of high capacity (referring to an indoor microcellular environment). Depending on the number of video users admitted into the system, our protocol varies: a) the request bandwidth dedicated to resolving the voice users contention, and b) the probability with which the base station grants information slots to voice users, in order to preserve full priority for video traffic. We evaluate the maximum voice capacity and mean access delay, as well as the aggregate channel throughput, for various voice and video load conditions, and the maximum voice capacity, aggregate channel throughput and average data message delays, for various video, voice and data load conditions. As proven by the comparison with a recently introduced efficient MAC scheme (DPRMA), when integrating voice and video traffic our scheme obtains higher voice capacity and aggregate channel throughput. When integrating all three traffic types, our scheme achieves high aggregate channel throughput in all cases of traffic load.     

基于网格技术的企业应用系统集成研究

针对当前企业的大量异构应用系统不能互联互通、资源不能共享、数据不能联动的现状。利用基于OGSA体系结构的最新网格开发工具GT4构建一个数据网格平台来集成现有应用系统。并详细描述实现的技术路线,给出整个系统的体系结构的描述。对其中的数据一致性维护、服务选择和系统异构性的消除等关键技术提供了解决方法。     

基于程序集成及响应面模型的电机冷却性能优化

建立某60 kW电动汽车用永磁同步电机模型,理论分析得到最佳流道条数以及流道参数取值范围。以冷却流道宽度a、高度b作为设计变量,电机温升和流道进出口压差作为目标函数,通过Isight集成网格变形软件Sculptor和CFD计算软件Fluent,应用拉丁超立方设计方法创建样本点,并进行数据的自动提交仿真计算。根据得到的数据建立响应面模型,采用多岛遗传算法对近似模型寻优。优化后,电机温升和进出口压差分别下降了6.01%、6.81%,电机的性能和安全运行得到了保障。     

一种基于相关系数加权的积累检测方法

文中从捷变频雷达系统中海杂波和目标各自的相关系数特点出发,提出一种基于相关系数加权的积累检测方法。从信号检测和概率统计理论角度,推导出文中方法的信杂噪比增益和检测概率公式,并且通过实测数据仿真实验验证理论分析的正确性和该方法有效性。     

Modular Deformable Steam Electricity Cogeneration System with Photothermal,Water, and Electrochemical Tunable Multilayers

Capturing solar energy for thermal conversion in a highly efficient manner for steam‐electricity cogeneration is particularly opportune in the context of optimal solar energy utilization for concurrent water‐energy harvesting. Herein, an integrative photothermal evaporator/thermogalvanic cell with the desired optical, heat, water, and electrochemical management for synergistic steam‐electricity production is reported. Versatile layer by‐layer assembly is employed to integrate a hydrogel/metal‐oxide/polymer into a multilayer film with individually addressable thickness, composition, and structure. As such, the ultimate integrative multilayer film cell demonstrates a unified high surface area and conductive electrodes, broadband absorption, rapid water suction‐ion exchange, and thermal insulation properties. Thus, the designed cell immensely suppresses heat losses, achieving a high solar thermal conversion efficiency of 91.4% and maximum power outputs of ≈1.6 mW m^?2. Additionally, the self‐floating, deformable, modular integral device presents appealing attributes such as salt‐rejection for viable seawater desalination, high mechanical stability, and resilience to demanding operating conditions, and configurable on‐demand/point‐of‐use tandem structure to maximize clean water and power generation value per area. This integrated strategy may provide prospective opportunities to reduce dependence on fossil fuels and freshwater inputs and solutions for renewable and decentralized clean water and electricity.