一种光输出功率控制电路

分析了光输出功率控制在光通信中的重要性 ,提出了一种有效的光功率控制电路。实验结果表明 ,该电路对调节和稳定光输出功率非常有效。     

发射组件监控模块的设计

监控模块是发射组件的重要组成部分,主要用于状态采集和开关控制。监控模块可实现发射组件的数字量采集、模拟量采集和信息处理。同时,上位机可通过控制局域网(CAN)总线获取发射组件的工作信息,并实现射频开关控制。文中介绍了监控模块的功能和组成框图,并对硬件电路设计和软件设计作了详细介绍,对监控模块的设计提出了一些有益的建议。     

PT2262/PT2272编解码IC在视频切换矩阵中的应用

提出了一种用PT2262/PT2272编解码IC制作的16×16视频切换矩阵的设计方案 ,给出了具体的电路图 ,同时在对其原理进行分析的基础上 ,指出了用该方案派生其它规格视频切换矩阵的基本思路。     

对高频PCB设计的研究

基于Protel 99 SE在高频PCB(印制电路板)设计与制作过程中,从高频PCB的布局、布线、焊盘及敷铜几个方面对散热、EMC(电磁兼容)、EM I(电磁干扰)及PCB的可制造性等问题进行研究,探讨了解决问题的技巧及方法。实践结果表明,在实际高频PCB设计与制作中取得了很好的效果。     

分布式仿真中通用态势可视化系统的开发研究

文章在分析了分布式仿真中传统态势可视化系统的基础上，提出了一种通用态势可视化系统的设计。它是基于面向对象的态势对象模型，使用基于消息的松散耦合方式实现态势对象与仿真通信模块相关联．通过态势模型配置解决了态势可视化的可组织性，态势对象定制解决了态势可视化的可扩充性。从而实现了通用的态势可视化系统。最后通过实践给出了通用态势可视化系统的特性和优点。     

GSM BSS系统的Gb Flex

从介绍Gb Flex特性入手,详细阐述了BVC流控制、GboIP的动态配置方案和网络连接拓扑,并提出了采用加权公平算法选取SGSN的方案。     

CdTe/CdS thin film solar cells grown in substrate configuration

The ability to grow efficient CdTe/CdS solar cells in substrate configuration would not only allow for the use of non‐transparent and flexible substrates but also enable a better control of junction formation. Yet, the problems of barrier formation at the back contact as well as the formation of a p–n junction with reduced recombination losses have to be solved. In this work, CdTe/CdS solar cells in substrate configuration were developed, and the results on different combinations of back contact materials are presented. The Cu content in the electrical back contact was found to be a crucial parameter for the optimal CdCl₂‐treatment procedure. For Cu‐free cells, two activation treatments were applied, whereas Cu‐containing cells were only treated once after the CdTe deposition. A recrystallization behavior of the CdTe layer upon its activation similar to superstrate configuration was found; however, no CdTe–CdS intermixing could be observed when the layers were treated consecutively. Remarkably high V_OC and fill factor of 768 mV and 68.6%, respectively, were achieved using a combination of MoO₃, Te, and Cu as back contact buffer layer resulting in 11.3% conversion efficiency. With a Cu‐free MoO₃/Te buffer material, a V_OC of 733 mV, a fill factor of 62.3%, and an efficiency of 10.0% were obtained. Copyright © 2012 John Wiley & Sons, Ltd.     

Physical and Molecular Properties of Re-extruded Starches as Affected by Extruder Screw Configuration

Amylomaize V, amylomaize VII, wheat and rice starches were extrusion cooked in a single-screw extruder at 140°C barrel temperature and 140 rpm screw speed. Extrudates were ground and re-extruded through a 3 mm cylindrical die nozzle using screws with no mixing (NM), 1 mixing (1M) or two mixing (2M) elements. Overall expansions were the highest and bulk densities were lowest with 1M. Radial expansions for amylomaize V, amylomaize VII, and wheat starches were the highest with 1M and lowest with 2M. Amylopectin contents of starches decreased with corresponding increases of gel permeation chromatograph peak II fractions when number of mixing elements was increased. λ_max values of peak I and peak II decreased upon re-extrusion of starches with increasing number of mixing elements.     

Starch-stearic Acid Complex Development within Single and Twin Screw Extruders

Corn starch was extruded with 4% stearic acid in Brabender single screw and twin screw laboratory extruders. The screws were cooled and removed and samples were collected from locations along the screws. In the single screw extruder, starch gelatinization as determined by DSC and polarized light microscopy started in the compression zone and was completed in the metering zone. Starch-stearic acid complex formation as determined by iodine binding capacity and X-ray diffraction started at the same point as gelatinization and increased to a maximum near the tip of the screw. In the twin screw extruder, starch gelatinization and starch-stearic acid complex formation started at a distance of seven screw diameters and continued from there to the die end.     

基于ZigBee和ARM的跨网远程监控系统

随着无线网络的快速发展, ZigBee技术在不同的领域得到广泛的应用。设计了一个基于ZigBee和arm的跨网远程监控系统,将ZigBee芯片CC2430与其他的传感器一起组成无线传感网络,用于采集监控环境信息,并用嵌入式ARM11实现无线传感网络与Internet网络的结合,将监控信息通过TCP/IP协议传输到远程监控服务器,并实现实时显示。嵌入式平台使用的是三星S3 C6410。