基于3G通信网机载飞行记录数据无线传输系统设计

为了对机载飞行纪录数据实现无线传输,提出了基于3G通信网实现机载飞行记录数据的无线传输,此系统实现了对机载飞行纪录数据的读取、加密和无线传输.此系统克服了工作人员前往停机坪用有线方式下载数据或用转存设备方式获取数据的方法,当飞机出勤率高或者飞机架数多时,极大地提高了工作效率和降低了机场保障成本.     

有线无线融合的卫星时间敏感网络流调度研究

随着空间通信任务日趋复杂化,尤其是对时间敏感的需求不断提升,一方面要求星内系统的高带宽、可靠性和实时性;另一方面星间无线链路也应具备低时延和高可靠性.但由于卫星内部有线链路与星间无线链路差异大,业务数据经过有线和无线链路联合传输时,容易引发节点拥塞,而无法保障时敏业务的时延有界需求.为了提升数据在空间网络传输的实时性,...     

基于ZigBee技术的填埋场渗漏检测系统研究

介绍填埋场渗漏检测的基本原理.针对便携式渗漏检测仪有线传输的弊端,研究基于ZigBee无线传输的渗漏检测系统,利用CC2431及采用ZigBee协议栈为平台,实现系统数据的无线传输,克服有线传输的局限性,减轻劳动强度.同时利用CC2431的定位引擎可很好地定位渗漏点,通过ZigBee技术将填埋场各个节点的信息与定位引擎计算的坐标传输给终端PC,实现基于ZigBee的填埋场渗漏检测与定位.经现场测试表明该系统满足设计要求.     

基于嵌入式的ZigBee无线条码扫描仪系统的设计

通过对传统条码扫描仪的改造,设计一种ZIGBEE无线通信技术的条码扫描仪.测量系统由CMOS图像传感器和嵌入式S3C2410处理器构成.利用ZIGBEE无线节点传输的方式,代替传统的有线和无线芯片传输技术,保证了条码图像数据准确可靠的传输.并通过嵌入式操作系统LINUX在MCU上的移植,成功地构建了一个实用的无线条码扫描多任务实时系统.系统在空阔地,每个ZIGBEE节点可以实现可靠传输50m.     

水质在线数字视频监控系统设计

本文介绍了远程网络环境监测系统,该系统采用4级层次结构,通过有线和无线传输,在智能适配器完成数据加密,实现了在线实时远程监测、集中显示、污染预报等集中管理.该系统可为国家的环境保护起一定作用.     

基于BasicRF的Zigbee无线透传模块设计

结合Zigbee无线传输的优势,利用BasicRF技术来解决有线控制系统向无线监控转换的问题。针对各种数据接口的不同协议传输之间要求不同的问题,以CC2530为核心设计了一个可以兼容多种有线协议数据的无线数据透传模块,实现数据的无线收发。利用BasicRF协议封装有线协议并避免了繁复的无线开发工作,在无线透明传输中只需要做好节点与Zigbee设备的连接而无需关心无线网络传输部分,为传统的有线控制系统提供物联接入的接口方案。     

通信工程中有线传输技术的应用及改进

随着社会经济的不断发展,科学技术和通信工程也得到了完善,尤其是有线传输技术方面.目前,通信技术可以分为有线传输和无线传输两种方式.无线传输的信息传送是运用电波技术,而有线传输却与之不相同,有线传输运用的是光电信号,并通过电缆或者光缆来实现信息传送.对比可以看出,有线传输更适合人们的日常生活.因此,本文以贵州省邮电规划设计院有限公司为例对通信工程中有线传输技术的应用及改进进行了相关阐述.     

升降机试验台无线测控系统的实现

目前在工业产品性能测试试验台的数据获取方面主要集中于有线传输途径,对无线传输在产品性能测试上的应用还较少;其中,数据通信冲突的处理以及系统鲁棒性的提高是无线传输应用的技术关键点。针对升降机试验台,提出了一种基于自定义无线传感网络协议的产品综合性能测试系统,该协议提出集权轮询法以及自适应变频滤波法以规避数据冲突以及增加数据的可靠性。测试证明该系统满足了产品测试的要求。     

基于蓝牙技术的无线传感器的设计

介绍了一种重要的测控数据采集装置——无线传感器数据采集装置。该装置采用最新的蓝牙技术、传感器采集技术和网络技术,主要实现了传感器采集数据的无线传输和远程监测功能。该装置运用传感器准确采集数据,经蓝牙实现无线传输,数据通过网络协议栈实现网页上的数据访问功能,可应用在远程监控系统中。该无线的传感器装置与有线的传感器装置相比,无线传感器能够更方便更实用地运用在生活中。整个过程运用了软件和硬件结合,实现了数据的无线传输和网络化访问监测和查看功能,方便人们在异地查看数据。     

基于ZigBee技术的填埋场渗漏检测系统研究

介绍填埋场渗漏检测的基本原理。针对便携式渗漏检测仪有线传输的弊端．研究基于ZigBee无线传输的渗漏检测系统,利用CC2431及采用ZigBee协议栈为平台。实现系统数据的无线传输,克服有线传输的局限性,减轻劳动强度。同时利用CC2431的定位引擎可很好地定位渗漏点,通过ZigBee技术将填埋场各个节点的信息与定位引擎计算的坐标传输给终端PC,实现基于ZigBee的填埋场渗漏检测与定位。经现场测试表明该系统满足设计要求。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.