基于Google Earth无线台站覆盖查询分析系统的设计与实现

以Google Earth为三维数据平台,在Visual Studio 2005开发环境中采用C#语言开发前台主程序,以Access2003为后台数据库,同时基于ICS telecom计算生成的覆盖图及覆盖人口,结合三维地图设计并实现了广西广播电视无线台站覆盖查询分析系统。     

嵌入式操作系统中USB双向通信的设计与实现

介绍了基于S1C33L11芯片利用嵌入式操作系统的同步机制通过对循环队列及自定义控制包的操作来实现USB双向通信的USB设备固件程序、驱动程序、应用程序的设计与具体实现。     

多策略适应的一种POSIX权能遗传算法

多数支持POSIX权能机制的安全操作系统提出了各自的权能遗传算法,但这些算法都只适用于特定的最小特权控制策略,并且存在语义冲突、安全目标不明确等问题,不能有效支持多种安全需求不同的特权策略。通过对一些现有算法的深入分析,提出了一种新的权能遗传算法,该算法引入策略关联的权能控制变量以及可信应用属性。实例分析表明本算法具有策略适应性和可用性,形式化分析和验证表明它可使系统满足特权策略的基本安全定理。     

基于Linux的无线电检测系统服务器的设计

以无线电监测系统为开发平台,开发了基于Linux的无线电检测系统服务器系统。主要内容包括操作系统引导启动的设计,根据实际的硬件要求对Linux内核的配置,运行在Linux上的命令文件的裁减,支持网络功能协议的配置,声卡驱动程序的配置以及根目录下文件系统的配置等。最后,进行了实验,结果表明Linux作为操作系统可以很好地满足无线电检测系统服务器的要求,他稳定的网络性能更适合本系统,具有广泛的应用前景。     

综合业务数字网协议分析及实现研究

简要介绍了综合业务数字网(ISDN)的发展及其功用,重点对其呼叫控制协议进行了分析,并在此基础上设计了一个Linux操作系统下的ISDN终端平台结构模型。通过该终端平台模型中各个部分所起到的功用进行详细分析与研究,从而实现了在Linux操作系统下综合业务数字网(ISDN)的呼叫控制协议。     

医院洁净手术室的室内空调参数分析

对《医院洁净手术部建设标准》中Ⅰ级洁净手术室的流场和温度场进行了数值模拟,证实了标准中的部分技术参数范围（主要针对静态手术室）在动态时是合适的,并具有可操作性。标准中规定Ⅰ级洁净手术室用局部送风代替全室单向流气流组织形式,既保证了关键区域的净化要求,又大大降低了洁净手术室的造价和运行费用,符合我国的国情。     

Multi-layer protruded electrodes for reducing the operating voltage and gamma shift of fringe-field switching LCDs

ABSTRACT

To reduce the operating voltage and gamma shift of the nematic liquid crystal display (LCD), a single-domain-protruded fringe-field switching (PFFS) electrode structure is designed. In this work, a kind of nematic liquid crystal (NLC) is introduced firstly. Then, the operating voltage and gamma shift of the proposed PFFS LCD are investigated under various electrodes’ parameters. Besides, its light leakage and contrast ratio are also discussed. The results show that the operating voltage of the PFFS LCD is only 1.40 V, here the electrodes’ width is 2 μm and electrodes’ gap is 4 μm. The gamma shift of the PFFS LCD can be reduced to the indistinguishable level under various electrodes’ sizes, if the height of the insulation layer is proper. For contrast ratio, it is larger than 200:1 at full viewing-angle, and the zone of 500:1 covers 60° polar angle.     

ITIL在电信运维应用中的研究

随着中国电信行业体制的变革,以网络为中心的电信运维过程正逐步向以客户为中心的方向转变。从电信运维管理技术手段上看,就是逐渐从网络管理向业务保障管理转变。本文通过引入ITIL(Information Technology Infrastructure Library,信息技术基础设施库)理论在电信运维管理工作中的应用进行了分析。     

距离选通水下激光成像作用距离简化核算方法

距离选通水下激光成像技术通过控制成像模块的阴极快门时间,从时域上屏蔽大部分可进入成像模块的光信号,能有效抑制水体后向散射对激光成像系统探测性能的影响,提高作用距离。距离选通水下激光成像设备的作用距离与水质条件有关,文章给出了一种关于作用距离的有效简化计算方法,根据该方法,可得出设备在不同水质的作用距离。     

MnFeNi-Based Composite as a Case Study of a Bifunctional Oxygen Electrocatalyst under Dynamically Changing Electrode Potentials

High-performance bifunctional electrocatalysts for the oxygen reduction (ORR) and oxygen evolution reaction (OER) are essential components in energy conversion and storage technologies. Yet, their poor reversibility hinders their applicability. A highly active ORR/OER catalyst, consisting of multiwalled carbon nanotubes-supported MnFeNiOx nanoparticles, was subjected to sequences of chronoamperometric steps alternating between the ORR, the OER and highly cathodic potentials (E_c). Rotating ring disk electrode methods revealed that applying E_c leads to a small increase in the current and peroxide species yield during the ORR while enhancing substantially the OER. X-ray absorption spectroscopy showed irreversible changes in the chemical state of MnFeNiOx correlating with its catalytic properties. The complexity of changes that a composite catalyst may undergo under varying potentials, the importance of monitoring product formation, and the convenience of using dynamic electrochemical sequences for the assessment of catalyst reversibility, as well as for the activation and/or restoration of their catalytic properties, are highlighted.