用于片上网络的准延时不敏感全异步仲裁器

针对传统片上网络不同方向请求信号之间的优先级动态变化带来的服务质量问题,设计了一种延时不敏感全异步仲裁器.这种仲裁器具有自检测优先级功能,可以通过动态检测输入请求的优先级变化来自动选择两种输出方式(优先输出方式和顺序输出方式),解决了传统片上网络中的静态仲裁机制带来的端口服务固定化问题.通过将输入请求锁存使仲裁模块和输出模块解耦合,大大提高了仲裁的稳定性.使用门限门使整个仲裁器准延时不敏感.最后,在0.18μm标准CMOS工艺下实现了此仲裁器,结果表明,此全异步仲裁器平均仲裁时间为1.175 ns,平均动态功耗为1.53mW,可以满足高速片上网络的仲裁要求.     

基于二次调节技术的小型装载机全液压驱动系统

介绍了全液压驱动系统的工作原理,构建了小型装载机行走和工作的全液压驱动系统,其特色在于一种新的二次调节元件液压变压器以及液压蓄能器的应用。建立了液压变压器压力比的数学模型和液压蓄能器的教学模型,并通过仿真分析了液压蓄能器特性参数与液压变压器配流盘控制角之间的关系。分析得出了所提出的全液压系统相对传统行走驱动系统的优势。     

Full-parameter vision navigation based on scene matching for aircrafts

Vision navigation based on scene matching between real-time images and a reference image has many advantages over the commonly used inertial navigation system （INS）, such as no cumulative measurement errors for long-endurance flight. Recent developments in vision navigation are mainly used for partial navigation parameters measurements, such as the position and the relative velocity, which cannot meet the requirements of completely autonomous navigation. We present the concept, principle and method of full-parameter vision navigation （FPVN） based on scene matching. The proposed method can obtain the three-dimensional （3D） position and attitude angles of an aircraft by the scene matching for multiple feature points instead of a single point in existing vision navigations. Thus, FPVN can achieve the geodetic position coordinates and attitude angles of the aircraft and then the velocity vector, attitude angular velocity and acceleration can be derived by the time differentials, which provide a full set of navigation parameters for aircrafts and unmanned aerial vehicles （UAVs）. The method can be combined with the INS and the cumulative errors of the INS can be corrected using the measurements of FPVN rather than satellite navigation systems. The approach provides a completely autonomous and accurate navigation method for long-endurance flight without the help of satellites.     

交流电动机软起动装置及其应用

以交流电动机的起动特性为出发点 ,阐述异步电动机起动过程由于冲击和振动对电网及设备造成的影响 ,分析、比较几种电动机的起动方式 ,简要介绍全数字式交流异步电动机软起动装置的工作原理和基本功能 ,指出全数字软起动器用于交流异步电动机起动带来的好处     

全日制工程硕士专业学位研究生培养调查与分析

文章通过对调查问卷的数据统计和分析来反映当前全日制工程硕士专业学位研究生培养现状,并在此基础上对相关问题进行了思考,以期为今后进一步提高全日制工程硕士专业学位研究生的培养质量提供借鉴。     

工作面隐伏突水构造瞬变电磁响应特征研究

工作面顶板和底板下隐伏导含水构造的瞬变电磁响应特征研究,是目前矿山安全生产技术研究的重点难点之一。采用瞬变电磁法全空间探测技术,能有效地探测工作面顶板、底板或煤层内部的隐伏导含水构造,并能确定其具体影响范围。在多测道剖面上对应测点位置的感应值相对较高,对应的曲线部分呈凸起或上升趋势,异常体反应不明显。多测道剖面图多用于实测数据的实时处理显示,根据初步处理结果来调整测线或测点的布置。隐伏导含水构造在视电阻率拟断面图中多呈封闭或半开口状,视电阻率值相对较小。     

江苏沙河抽水蓄能电站给水系统设计

在江苏沙河抽水蓄能电站给水系统的设计中，因地制宜地选用工艺流程．并采用FA型全自动净水装置。近两年的运行实践表明，该工程的设计是成功的。     

基于向量整体扰动的快速收敛人工蜂群算法

针对标准人工蜂群算法收敛速度慢和易陷入早熟收敛等问题,提出一种快速收敛人工蜂群算法。首先借助反向学习理论初始化种群来提高初始解的分布质量,并在雇佣蜂和跟随蜂阶段引入向量整体扰动搜索方程加快局部搜索;然后为了跳出局部最优,采用一种随机更新搜索策略来增加蜂群多样性以平衡全局探索和局部利用能力;最后通过八个标准测试函数的仿真实验,发现所提出的算法与几个改进的人工蜂群算法相比,具有更快的收敛速度且获得了更高的求解精度,验证了算法的优越性。     

全定制CORDIC运算器设计

浮点三角函数计算是导航系统、三维图像处理、雷达信号预处理等领域的基本运算.本文采用CORDIC算法及全定制集成电路设计方法实现了一种浮点三角函数计算电路,其输出数据兼容IEEE-754单精度浮点数标准.本文首先介绍了CORDIC算法的原理,并根据性能优先的原则采用了流水线结构;然后给出了基于SMIC O.13μm 1P...     

A Review of “Dancing with Digital Natives: Staying in Step with the Generation That’s Transforming the Way Business is Done”

Abstract

A major initiative of the Sandia National Laboratories Technical Library is to provide desktop access to information for Sandia researchers. During 1995 the Library created a home page, with information about how to link to its client-server based OPAC. Through multiple access points Sandians can now search the catalog from their desks. A new and evolving initiative within Sandia Laboratories is to improve desktop access to Sandia-generated documents (full-text) by converting them to electronic form, placing them on Sandia's “internal Web,” and linking them to the OPAC bibliographic record, enabling desktop viewing and printing. This paper addresses the processes developed in the Library to accomplish the preceding activities. It also addresses procedures for cataloging these electronic reports, including identification of the bibliographic information and MARC tags to be used. Open issues and lessons learned are identified.