基于GPS和TTS的自动报站器方案设计

针对国内公交车报站器的应用现状,提出了一种基于GPS和TTS的全自动公交语音报站器的设计方案.分析了该报站器的特点并提出了其整体构架以及具体的终端设计,采用以ARM Cortex-M3为核心的stm32f103vet6处理器,通过GPS和GPRS相结合的方式实现车辆位置信息的读取、车辆与控制中心的无线通信,同时采用语音合成技术真正实现全自动准确地播报站名及服务提示信息.     

公交车载GPS智能报站系统设计

随着城市建设和道路建设规模的扩大,车辆日益增多,公交车辆的监控调度和合理管理已成为交通系统中的一个重要问题。公交车载GPS(全球定位系统)智能报站系统是一个建立在GPS、GIS(地理信息系统)和无线通讯手段之上,专业服务于车辆监控与调度的GPS软件平台,能够实现车辆的实时监控和科学调度,降低事故发生率。探讨了GPS车辆监控与调度系统的工作原理、结构和功能,以及为确保GPS系统正常、高效运行而应做出的制度安排。     

基于北斗定位的智能公交车载系统的设计

介绍了一种新型智能公交车载系统,以Cortex-M3处理器STM32为硬件核心,运用北斗定位、GPRS和MP3语音播放等技术,实现了公交车智能语音报站、LCD液晶显示、实时定位和远程监控等功能。文章主要对智能公交车载系统的总体方案、硬件设计和软件实现进行了详细的介绍。     

基于GPS的公交车智能调度与位置发布系统

为了提高城市公交车运营的管理和服务质量,采用GPS定位技术设计了公交车智能调度和位置发布系统,系统由调度中心、车载定位终端和公交站牌发布端三个子系统组成.车载定位终端通过GPRS网络接入Internet,建立与调度中心的TCP/IP网络连接,将公交车的位置信息实时上传至调度中心进行处理,并将结果发送到所属线路的电子站牌上,使乘客能够在公交站牌上提前获取车辆的位置信息.经实验表明,该系统工作稳定可靠,实现了设计的所有功能,能帮助乘客提前选择较好的出行方式.     

基于GPS/GPRS的车载监控终端设计

正车载GPS定位终端是融全球卫星定位技术(GPS)和现代无线通信技术于一体的高科技系统。移动车辆配备的车载GPS终端用以获取自己的当前位置、时间、车速及行进方向等信息,实时地通过GPRS无线通信信道或短消息方式上传到远程监控中心,远程监控中心通过GPRS通信模块监测各车载目标的状况,并对当前受监控车辆运行状态、安全状态进行实时监控解析、故障诊断,并完成对车辆的定位、监控及合理调度。     

基于物联网与客流估计的智能公交调度设计

为了提高公交服务效率,提出了基于物联网的智能公交调度系统。系统采用RFID技术实现公交车辆的定位与监控,并通过站台子系统采集站点各路公交车候车乘客数,无线传感网将采集到的车辆信息和站点各路次候车乘客数传输到公交监控调度中心,公交监控调度中心进行数据处理和分析,将公交车辆信息发布到站点显示系统供乘客浏览,并根据各路次各站点乘客的实时数据智能地在调度公交车辆。公交智能调度系统可以适应客流变化,实现公交运营的高效化、智能化。     

基于GPS/GPRS车载终端的设计与实现

现代智能交通对车辆监控与调度的需求日益迫切。本文介绍了车辆监控系统的组成及主要功能．介绍了GPS定位技术和GPRS无线数据传输技术．并根据车辆监控系统的功能需求．提出了基于GPS／GPRS技术的车载监控终端的设计方案,描述了车载监控终端系统的主要功能．详细描写了硬件和软件部分的设计实现方法.     

基于GPS／GPRS的智能公交系统的设计与实现

针对国内外公共交通管理的实际情况及GPS技术的发展现状,以及目前国内没有将GPS,GPRS和GIS相融合以实现车辆定位信息的采集、收发和显示的成熟智能公交系统。文中设计一种基于GPS,GPRS和GIS技术的智能公交系统,并详细介绍了其组成结构和工作原理。该系统实现了基于GPS的车辆实时信息采集、基于GPRS的信息无线传输、基于GIS的车辆远程监控调度。     

基于GPS公交车限速报站系统设计

为实现公交车的自动报站功能,提出一种以C8051F040单片机和GPS卫星定位系统的设计方案。首先设置通过录音接口预存各站点具体位置的语音信息,当公交车在行驶时,能自动识别站点并完成语音报站功能,同时可设置公交车行驶的上限速度,当超过该速度值时,系统将完成语音报警提示。该系统定位准确,并可实现全天侯工作。     

基于GPS/GPRS车载终端的设计与实现

现代智能交通对车辆监控与调度的需求日益迫切。本文介绍了车辆监控系统的组成及主要功能.介绍了GPS定位技术和GPRs无线数据传输技术,并根据车辆监控系统的功能需求.提出了基于GPS/GPRS技术的车载监控终端的设计方案.描述了车载监控终端系统的主要功能.详细描写了硬件和软件部分的设计实现方法。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

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.