基于ZigBee与Android结合远程监测系统设计

文中提出了一种基于ZigBee与Android平台相结合的水质参数远程监测系统,该系统实现了对水位、温度、p H和溶氧等水质参数信息的采集、存储与管理。采集部分采用了TI公司CC2530芯片,传感器节点采集水质参数后将数据利用ZigBee技术发送到汇聚节点,再通过GPRS模块发送至远程服务器,最后由服务器向Android客户端发送水质参数数据。这样通过Android客户端就可以完成对水质参数的监测。文中系统在江苏扬中水上生态乐园试验基地进行实验实际调试,温度、p H、水位各项监测指标均能达到要求。     

基于ZigBee技术的水质监测系统

为了实现水质的实时监测,提出了一种基于ZigBee技术的多参数水质监测系统,并对系统的硬件和软件进行了详细的分析和设计。无线传输节点采用了TI公司的单芯片CC2430＋低功耗功放CC2591解决方案,并修改和移植了ZigBee精简协议栈代码,再编写水质监测系统的应用程序和相关驱动程序。试验结果表明,该系统可扩展性强,节点功耗低,实时性能够满足水质监测系统的需求。     

基于ZigBee和GPRS积雪数据监测系统设计

利用ZigBee技术,将各个积雪监测设备及传感器进行组合构成自组测量网络,以通用分组无线服务(GPRS,General Packet Radio Service)方式与监测中心通讯,从而构建一个基于ZigBee和GPRS的积雪数据实时监测系统。该设计将新一代无线网络通信技术ZigBee与GPRS移动通信相结合,应用于积雪数据监测,与传统人工监测方法相比,具有非常重大的意义和应用前景。     

基于ZigBee技术的医疗监测系统设计

现如今,传统医疗仍采用人工监护的模式,但中国人口众多,传统的医护模式并不能满足大众需求,并且存在医护资源浪费等问题。文章主要介绍一种基于ZigBee技术的医疗监测系统,使用传感器采集人体数据后通过ZigBee无线网络上传到医院的监测系统,在提升看护效率的同时实现了利用现有医疗资源的最大化。     

基于物联网的水质监测系统设计与实现

为了提高水质监测系统中pH值的采样精度,并解决定时定点采集数据耗费人力物力问题,设计并实现一种基于物联网的水质监测系统。首先,为了提高pH值的测量精度,硬件电路上使用AD8603进行前级调理,AD7792进行高精采样,软件设计上采用中值滤波和滑动滤波算法。其次,搭建水质监测服务平台,监测数据通过ZigBee传输到主机,在经由GPRS发送到服务器,用户使用手机APP或Web可以远程监控每台设备的数据。结果表明,所提方法提高了监测设备的pH值测量精度,监控平台运行稳定可靠。     

基于ZigBee的远程环境监测人机交互系统设计

针对传统的室内环境监测系统传输距离短、采集到的数据形式单一且需要进行人工处理的缺陷,设计并实现了一个基于ZigBee的远程环境监测人机交互系统。系统采用模块化的设计方案,整个系统由数据采集终端、ZigBee无线传感网和LabVIEW人机交互界面三部分组成。数据采集终端以STM32微控制器为主控芯片,连接各传感器采集环境数据。数据采集终端通过ZigBee无线传感网和USB转串口模块与上位机通信,上位机通过LabVIEW人机交互界面将数据采集终端测得的环境数据以仪表和折线图的形式显示出来。实验表明,系统稳定性和可扩展性较强、传输距离较远,且无需人工处理即可将每天测得的环境数据以折线图形式直观展现出来,具有一定的科研意义和实用价值。     

基于Arduino的智能鱼缸监控系统设计

传统鱼缸饲养观赏鱼,主要以投放人工饲料为载体。但因为环境限制,导致饲养水得不到及时更换,水质环境无法实时监测,饲养体验不好,家庭饲养困难。因此,本文针对这种情况,基于Arduino开发主板设计了一款能实时监测鱼缸外的温湿度、大气压值,同时能监测鱼缸内养殖水的PH值、氨氮含量、溶解氧等主要参数。并通过云平台实时对监测到的数据进行存储分析,根据设定好的阈值进行自动预警与调控。相比较于传统经验养殖,能做到实时监控、实时监测水质、及时调整,让用户得到更好的饲养体验。     

基于ZigBee的温室花房环境监测系统设计

为了实现温室花房环境的实时监测,提出了一种基于ZigBee技术的环境监测系统,并对系统的整体设计进行了研究。通过对ZigBee技术的分析和对CC2430芯片的研究,利用ZigBee技术设计环境监测系统,运用该系统对温室花房的温度、湿度等进行监测,达到实时远程监测的目的。     

基于ZigBee技术的空气质量监测系统

本文针对我国雾霾天气频发空气质量不断恶化的情况,设计了一种基于ZigBee无线网络技术的空气质量监测系统。该系统以ZigBee无线网络为核心搭配GPRS通讯技术,通过布置在监测区域的ZigBee节点驱动传感器采集空气质量数据,由一个ZigBee协调器及多个路由器节点构成一个监测网,协调器负责整个区域数据收集并通过GPRS网络传输给远程数据管理中心,实时监测空气质量变化并及时发布空气质量信息。     

基于ZigBee协议的无线传输地震监测系统

介绍了ZigBee协议无线传输地震监测系统的结构,阐述了MEMS加速度传感器的性能和ZigBee模块传输组网方式,实现了ZigBee协议传输地震数据。试验结果表明,系统运行稳定,能获取可靠地震波形数据。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

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.     

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.     

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.     

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.     

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.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

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.     

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.