基于FCS的光纤不锈钢管焊接生产线的电控系统

介绍了基于现场总线控制系统（FCS）的光纤不锈钢管焊接生产线电控系统,其对传统PLC控制系统进行了改进和提高,通过PROFIBUS总线将分散的PLC和变频器等现场设备连接成一体,组成便于集中监控的现场总线控制系统。     

一种不规则焊缝自适应焊接机器人系统研究

提出了一种基于摆动电弧传感器焊接系统的焊缝宽度自适应焊缝跟踪算法。焊接摆动控制器由步进电机驱动滚珠丝杠机构,实现焊枪的摆动。机器人主控制器基于ARM处理器开发,实现机器人的运动轨迹控制、运算求解、示教、再现。通过分析摆动电弧的信号和焊枪前一周期摆动数据,建立复函数自适应算法控制模型,计算出焊缝变化后的摆动参数反馈控制系统,完成焊缝宽度自适应跟踪焊接,并以x,y,z三轴直角坐标焊接机器人为运动平台进行模拟试验来验证算法的合理性。试验结果证明,焊接速度4mm/s、焊接频率0.5 Hz条件下,该算法能良好的适应焊接过程中焊缝宽度的变化,性能稳定,焊枪运动轨迹良好。     

现场总线

现场总线控制是工业设备自动化控制的一种计算机局域网络。它是依靠具有检测、控制、通信能力的微处理芯片，数字化仪表（设备）在现场实现彻底分散控制，并以这些现场分散的测量，控制设备单个点作为网络节点，将这些点以总线形式连接起来，形成一个现场总线控制系统。它是属于最底层的网络系统，是网络集成式全分布控制系统，它将原来集散型的DCS系统现场控制机的功能，     

基于CC—Link网络的PLC控制系统

阐述一种用CC-Link开放式现场总线构成的PLC控制系统.着重介绍该总线的网络特点、功能、通信原理及通信方法,进行了深入的研究,并设计了现场总线应用的控制系统--炉窖网络控制系统.应用结果表明,利用该总线设计的控制系统具有保护功能齐全、通信速率快、实时性好、可靠性高、布线方便等优点,基于CC-Link网络控制系统具有较高的实用价值.     

电动钻机柴油发电机组控制系统通信单元设计

在开发电动钻机柴油发电机组数字式控制器过程中,需要实现其与电动钻机控制系统之间的通信功能.基于现场总线器件,设计一种能够实现Profibus-DP与CAN总线协议转换功能的通信单元,该单元由Profibus-DP从站接口电路和CAN节点电路组成,应用双口RAM器件实现两者之间的数据交换.该方案完善了电动钻机控制系统的总线控制方式,有利于提高产品的数字化程度.     

电动钻机柴油发电机组控制系统通信单元设计

在开发电动钻机柴油发电机组数字式控制器过程中,需要实现其与电动钻机控制系统之间的通信功能。基于现场总线器件,设计一种能够实现Profibus—DP与CAN总线协议转换功能的通信单元,该单元由Profibus—DP从站接口电路和CAN节点电路组成,应用双口RAM器件实现两者之间的数据交换。该方案完善了电动钻机控制系统的总线控制方式,有利于提高产品的数字化程度。     

高校校园节能系统及管理方法研究

首先对开展节能工作的意义及其在高校校园中的应用情况进行了介绍,然后对计算机节能控制系统所使用的现场总线技术的实现原理和应用特点进行了分析,最后就节能控制系统的结构及功能进行了讨论。     

基于CAN总线的集散控制系统

本文研究了基于现场总线的集散控制系统,并与传统的集散控制系统进行比较,同时详细地阐述了在现场总线中得到广泛应用的CAN总线的构成、特点,给出了CAN节点的多种实现方式。     

基于CAN总线的集散控制系统

本文研究了基于现场总线的集散控制系统,并与传统的集散控制系统进行比较,同时详细地阐述了在现场总线中得到广泛应用的CAN总线的构成、特点,给出了CAN节点的多种实现方式.     

PROFIBUS—DP现场总线技术在野战光缆生产线主动放线绞笼中的应用

主要介绍了由S7—300PLC、DANFOSS VLT 5000系列变频器基于PROFIBUS-DP现场总线技术实现的野战光缆生产线主动放线绞笼的电气控制系统，包括用PROFIBUS-DP现场总线技术控制VLT 5000的方法，控制系统中的参数设置，数据类型以及应用STEP7组态PROFIBUS-DP现场总线控制系统的过程和STEP7软件编程设计。     

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.     

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.     

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.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks