水厂滤池自动控制中PLC的应用

随着社会的发展和科技的进步,PLC控制在水厂滤池自动化控制中占有很重要的地位。水厂滤池的过滤效果及使用年限的长短,与滤池反冲洗效果有直接关系。因此需要一套有效的反冲洗工艺及相应的控制方式。文章介绍了水厂滤池自动化控制系统和PLC控制技术,阐述了PLC控制在水厂滤池自动化控制中的特点,分析了PLC在滤池自动控制中的应用。     

现代水厂自动控制系统的开发

随着现代社会的发展,人们的生活方式在不断的变化,社会之中对于水厂的管理是十分重要的问题,所以为了能够对水厂的自动化控制系统有所了解,本文从SCADA系统的特点出发,进一步的对水厂控制系统的总体布局进行了研究,最后主要的对水厂管理的内容进行分析,希望对实际的水厂的自动化的控制系统的开发起到示范作用.     

在线仪表在水厂自动控制系统中的应用分析

近几年来,随着自动化检测技术的飞速发展,自动化检测仪表具有测量精确、显示清晰、操作简单的优点,在各个自动化控制系统中得到广泛系统。水厂直接关系到人们生活、工业用水质量,因此,在水厂自动控制系统中应用在线检测仪表具有重要意义。本文首先介绍主要的自动化在线仪表种类,然后分析在线仪表在水厂自动控制系统中的应用,以望对此有更深的理解。     

试析现代自来水厂自动化控制系统

在结合实际工程的基础上,在现代子来说进行制造和加工的过程中都采用了自动化控制装置,这种自动化控制系统是随着现代网络技术而不断发展的,变频节能技术是水厂降低电耗的关键,为了实现管控一体化的目标,提出了相应的改进型方案。     

变频器在自动化水厂中的应用

本文讨论了变频器在自动化水厂中的一些应用，对变频器在自动化水厂中软、硬件设置，送水泵房的闭环控制方式，取水泵房的串级控制方式进行简要说明。     

水厂加氯系统中自动控制技术的应用

水厂加氯过程是生产中比较关键的步骤,随着生产扩大化、自动化水平提高,自动控制技术被广泛的应用到水厂加氯系统中。本文介绍了水厂加氯系统的工艺流程和水厂加氯系统中自动控制系统的构成,对水厂加氯系统和自动控制系统有了深刻认识之后,重点分析了几种自动控制技术在加氯系统中的应用。     

水厂自动化系统防雷探讨

本文分析、讨论了自动化系统的防雷问题，着重阐述了水厂自动化控制系统的综合防雷措施。     

刍议水厂自动化供水系统的优化设计

现在的水厂都逐渐开始采用自动化供水系统,从而实现保证有效供水的同时消耗更少的资源,进而使水厂获得良好的经济效益以及社会效益,文章对自动化供水系统的优化设计进行了必要的分析讨论,从而为优化供水调节,保障人民群众的用水质量,促进供水企业的发展提供更多的技术保障。     

现代自来水厂自动化控制系统的应用

现代自来水厂虽然独立运行,但其并不是一个独立的个体,为了更便于上级部门的管理和监控,水厂需要与外界共享水厂信息。文中分析了现代自来水厂自控系统,并进一步对现代水厂自动化控制系统的应用进行了具体的阐述。     

黄阁水厂系统数据集成和软件实现

本文介绍了广州南沙黄阁水厂的整体网络布局,确定了自动化系统的数据交换的形式与原则。并对结合水厂实际介绍了上位机各个软件中的通讯和数据报表软件的编制。     

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.     

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.     

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.     

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