单片机在气体超声波流量计中的应用

介绍了单片机系统应用在气体超声流量计中进行数据采集和处理的原理，详细描述了该系统的硬件与软件构成以该仪表由于使用单片机而具有的一些特点。     

低成本GPS姿态测量系统

本文介绍了GPS姿态测量系统的原理，采用三块Rockwell公司生产的JupiterOEM板，PC／104 586工控机及其接口板设计了低成本GPS姿态系统样机，给出了系统组成框图和软件结构框图，并给出了试验结果，表明系统运行良好。     

嵌入式科里奥利质量流量变送器的设计

本文详细介绍了以微控制器为中心的科里奥利质量流量计变送器的工作原理．基本组成和性能,并给出了硬件设计的电路框图。     

低轨道卫星通信系统综述

概述了低轨道卫星通信系统的发展及特点；对低轨道卫星系统的组成及使用范围给予了较详细的介绍，并给出了工作方式框图及系统框图．     

一种改进的DFT-S-OFDM系统信道估计方法

本文首先给出了DFT-S—OFDM上行链路系统的一个简单发射机框图，然后基于该框图对系统进行了简单描述，给出了基于LS准则的信道估计方法和为了进一步提高估计精度基于时域维纳滤波处理的信道估计方法。仿真结果表明，在未编码16QAM-DFT-S-OFDM系统中，基于时域维纳滤波处理的估计可以达到与导频基于LMMSE准则的信道估计方法相同的估计性能，但这种方法一般要比后者有低的复杂度。     

基于4位嵌入式MCU的计算器电路综述

对基于４位嵌入式微控制器的计算器电路进行了综述，包括功能框图与工作原理、指令系统、内核硬件结构以及系统与外界接口等。     

基于TMS320VC5509 DSP通信系统的G.729算法实现

为实现语音信号高质量低bit率传输、存储，现介绍了国际电讯联盟（ITU）提出的基于共轭结构代数码激励线形预测的G．729语音压缩算法的基本特性、基本原理，并且介绍了以TMS320VC5509为核心的DSP实时编解码系统：详细说明了该实时系统的硬件结构，以及G．729算法在TI公司16bit定点DSP上的软件实现过程，包括系统硬件框图、算法框图、编码细节。该实时通讯系统通过附加通讯模块可以与其它不同类型的系统互连，实现语音的实时通讯。     

SDV和HFC的发展动向

简要叙述了ＨＦＣ的潜在优势和关键技术，ＳＤＶ系统的框图及原理，ＳＤＶ和ＨＦＣ的比较与发展前景。     

高比特率数字环路技术─—收、发器单元

本文介绍了HDSL传输设备中收、发器单元的工作原理与系统组成框图，并就其中的主要电路组成模块进行分析与叙述。     

优化模具设计与压铸机选型的方法

研究了模具设计与压铸机类型和参数选择的ＣＡＤ系统的组成，主要功能及系统程序设计。并给出相应的程序流程框图。阐述了该系统的必要性，同时建立了各种类型压铸机规范及技术参数数据库，以供用户选择和调用，该系统的设计思想亦适合于其它模具设计领域。     

Process and device modeling for VISI

The appearance of Very Large Scale Integration caused a pronounced interest in concentrating on process and device modeling. The fundamental properties which represent the basis for all device modeling activities are summarized. The sensible use of physical and technological parameters is discussed and the most important physical phenomena which are required to be taken into account are scrutinized. The assumptions necessary for finding a reasonable trade-off between efficiency and effort for a model synthesis are recollected. Methods to bypass limitations induced by these assumptions are pin-pointed. Formulae that are applicable in a simple and easy way for the physical parameters of major importance are presented. The necessity of a careful parameter-selection, based on physical information, is shown. Some glimpses on the numerical solution of the semiconductor equations are given. The discretisation of the partial differential equations with finite differences is outlined. Linearisation methods and algorithms for the solution of large sparse linear systems are sketched. Results of our two dimensional MOSFET model — MINIMOS — are discussed. Much emphasis is laid on the didactic potential of such a complex high order model.     

毫米波缝隙天线的三维非硅微加工制造技术

讨论了面向毫米波缝隙天线集成制造应用的三维非硅微加工技术方案,重点解决多种材料兼容、多层复杂微结构集成和大悬空高度等独特难题。针对天线器件中金属和介质材料的结合,提出了加法工艺、减法工艺以及一种通用型图形化微加工工艺,其中通用型图形化工艺为各种非硅薄膜材料在MEMS体系中的灵活运用创造了条件;为了实现多层复杂微结构的加工,提出工艺整合和工艺兼容性设计,针对天线器件中的悬空结构对牺牲层工艺进行了研究;最后以一种单向宽带毫米波平面缝隙天线为例,阐述其具体工艺流程,验证了上述工艺的可行性。     

基于SOPC的红外智能视频终端设计与应用

提出了一种基于SOPC的TAU320红外热像仪联网方案。采用美国Altera公司生产的 Cyclone III系列FPGA芯片作为平台,搭建了包含SRAM、W5300多个外设接口的SOPC系统。通过TAU320热像仪 采集视频数据,并将其乒乓存储至SRAM;采取DMA方式读取数据,经W5300网络芯片将其传送至远程PC 机。PC端用于控制硬件电路的工作状态切换以及实现视频显示。本文系统采用TCP协议实现了视频数据传 输,并具有体积小、功耗低、控制灵活等特点。     

基于覆盖网的QoS问题研究综述

用覆盖网来进行QoS控制是一种十分有效的方法.覆盖网因其固有的优点,越来越得到研究者的重视:新应用的部署周期短,费用小,代价低.介绍了覆盖网的定义,应用必要性,并根据其进行QoS控制的状况进行了分类.重点研究了各种用于QoS控制的覆盖网,详细描述和分析了其思想,应用环境和优缺点.重点介绍了其体系结构和QoS路由算法,同时指出了目前的研究中过程所存在的问题,并对未来Qos问题的研究进行了展望.     

海量超声数据体可视化研究

近年来,随着科学数据的快速增长,海量数据的可视化分析成了急需解决的难题.越来越多的处理海量数据的方法向着并行、分布式处理的方向发展.本文提出了一种混合的框架来处理海量的超声数据,该框架通过整合多种硬件环境和计算资源来处理海量数据;所有的数据都存放在一个基于高速网络环境的数据共享中心,具有高性能显卡的前端工作站将耗时的处理任务分配到网络中的计算结点,而自身处理显示和交互的操作;同时基于OpenCL和OpenMP实现了可视化算法在GPU和CPU上的并行计算;核外算法应用在本框架中来处理海量的体数据.实验结果表明,本文提出的框架不仅可以处理海量数据,而且具有较高的交互性能.     

Electronic coupling and structural ordering of quantum dots using InAs quantum dot columns

In this article, recent investigations of vertically aligned quantum dot columns conducted at Stanford University are reviewed. The quantum dots are InAs in a matrix of GaAs. Both the quantum dots and quantum dot columns are formed through strain-induced islanding, without lithography. Two aspects of these columns are discussed. First, the electronic coupling of quantum dots within columns of up to ten quantum dots is demonstrated. The coupling is adjusted and improvements to a simple light-emitting diode are shown. Second, increased uniformity of a surface quantum dot layer is shown when a subsurface layer of these columns are used. The most impressive results occur when the columns contain a large number of islands. Reduced variations in average ensemble height and diameter, called size uniformity, and average nearest neighbor distances, called structural uniformity, are shown. A surface unit cell of islands is demonstrated and the lack of a surface lattice is discussed.     

Micro-automating semiconductor fabrication

Progress in automating very-small-scale mechanical processes is reviewed. The special requirements of microautomation are identified, and three applications are examined. They are positioning, electrical probing, and mechanical probing. The architecture and design of a microautomation system are described. Microsensors and microactuators are discussed. The use of magnetics technology for driving the microautomation system is reported, and a precision workspace for demonstrating a microautomation system is described. Also described are a coarse/fine positioner and a linear transport path capable of moving the fine manipulator from one precision-demanding area to another     

Quantum functional devices: resonant-tunneling transistors,circuits with reduced complexity, and multiple valued logic

Recent advances in the area of quantum functional devices are discussed. After a discussion of the functional device concept, resonant-tunneling bipolar transistors (RTBTs) with a double barrier in the base region are described. Design considerations for RTBTs with ballistic injection and the first observation of minority-electron ballistic RT are presented. RTBTs using thermionic injection and exhibiting a high peak-to-valley ratio at room temperature in the transfer characteristics are also described. Multiple-state RTBTs and their DC and microwave performance are then discussed. Circuit applications of RTBTs also are discussed. It is shown that RTBTs allow the implementation of many analog and digital circuit functions with a greatly reduced number of transistors and show considerable promise for multiple-valued logic. Experimental results on frequency multipliers and parity bit generators are presented. Analog-to-digital converters are memory circuits are also discussed. Two novel superlattice-base transistors are reported. Negative transconductance is achieved by suppression of injection into minibands. Gated quantum-well RT transistors are also discussed     

Drone Detection with Chirp-Pulse Radar Based on Target Fluctuation Models

This paper presents a pulse radar system to detect drones based on a target fluctuation model, specifically the Swerling target model. Because drones are small atypical objects and are mainly composed of non-conducting materials, their radar cross-section value is low and fluctuating. Therefore, determining the target fluctuation model and applying a proper integration method are important. The proposed system is herein experimentally verified and the results are discussed. A prototype design of the pulse radar system is based on radar equations. It adopts three different pulse modes and a coherent pulse integration to ensure a high signal-to-noise ratio. Outdoor measurements are performed with a prototype radar system to detect Doppler frequencies from both the drone frame and blades. The results indicate that the drone frame and blades are detected within an instrumental maximum range. Additionally, the results show that the drone's frame and blades are close to the Swerling 3 and 4 target models, respectively. By the analysis of the Swerling target models, proper integration methods for detecting drones are verified and can thus contribute to increasing in detectability.     

化简开关函数的图论方法

本文引入了n变量开关函数F(x1,,xn)的伴随图G和伴随超图H的概念,导出了下列方法和算法:(1)求F的所有本原蕴含项的图论方法和分支定界算法BBAPI;(2)应用超图理论求F的最小和表达式的算法AMSHT。这些方法简单、直观;既便于手算,也便于用计算机实现;计算效率高于常用的卡诺图法和Q-M列表法。