基于MCGS组态技术的PLC实践教学改革

针对目前PLC实践教学中存在的问题,如设备投入不足、学生学习兴趣不高等,提出将MCGS组态软件与PLC控制技术相结合来设计监控系统,并以混料简易控制为例,讲解组态控制系统的构造过程。实践证明,该上位机监控系统可以模拟现场自动设备系统的工艺流程,可以与PLC实施信息交互,可以实时监控PLC工作。此改革既可缓解高校PLC实践教学设备投入不足的困难,又可提高学生的学习兴趣,培养学生PLC控制系统的综合开发能力。     

基于工控组态软件的PLC虚拟实验系统设计与实现

针对职业院校PLC实验硬件设备不足,实验项目有限,实验教学力度不断增强这种现状,提出了利用MCGS组态软件,设计并开发PLC虚拟实验系统的方法。包括虚拟实验系统的组成、实验项目的设计流程,PLC实验在虚拟实验平台的实现。     

基于PLC的无级调速控制系统设计

以无级调速为对象,基于S7-200PLC与MCGS进行了控制系统的设计。首先介绍PLC、无级调速和MCGS组态软件的现状,以PLC控制技术为核心,进行无级调速的控制系统设计。接着对控制系统进行编程调试,最后对运动过程进行MCGS组态监控,来验证设计的可行性。．所采取方法对工业调速的自动控制具有重要的意义。     

基于PLC的无级调速控制系统设计

以无级调速为对象,基于S7-200PLC与MCGS进行了控制系统的设计。首先介绍PLC、无级调速和MCGS组态软件的现状,以PLC控制技术为核心,进行无级调速的控制系统设计。接着对控制系统进行编程调试,最后对运动过程进行MCGS组态监控,来验证设计的可行性。所采取方法对工业调速的自动控制具有重要的意义。     

基于行为导向教学法PLC课程实训单元设计

从高职院校机电专业PLC课程的教学现状出发,为更好地培养高职院校学生的实践动手能力,根据PLC课程的特点,把行为导向教学法应用到此课程中,结合组态技术,设计PLC教学实训单元。给出了实训单元的硬件组成、软件控制流程以及组态画面,描述了利用该单元PLC教学项目实训的开展。由此使PLC课程教学实训达到优化,教学的效率和质量得到提高。     

基于MCGS的水箱液位监控系统的设计

液位控制是工业生产中比较常见的一种控制任务。为了加强液位控制的自动化程度和对液位控制的实时监控,文章将操作性很高的PLC和可视度很直观的组态软件MCGS相结合,由PLC进行液位控制,MCGS实现远程监控、数据曲线观测和超限报警等功能。通过实验证明,这套基于MCGS的PLC水箱液位监控系统具有及时调节、监控方便的特点,具有一定的研究和应用价值。     

基于PLC控制的五车位升降横移式立体车库设计

本文主要以五车位升降横移式立体车库为研究对象,对其进行控制系统研究与设计。文章详细介绍了车库PLC控制系统和监控系统,其中控制部分工作任务由西门子PLC完成,监控部分采用基于WINDOWS平台的工控组态软件MCGS。系统具有友好的人机交互界面,控制灵活,系统的安全性和可靠性高。     

基于MCGS的PLC实验教学系统的构建

根据PLC课程的教学特点,针对目前很多高校该课程实践环节的现状,提出运用MCGS组态软件技术构建PLC实验教学系统构想及现实意义并予以实现.文章通过实例,给出了系统的结构框图、组态软件虚拟PLC被检对象变量设置方法等,图文并茂,较详细介绍了系统开发过程.     

基于MCGS和三菱PLC的洗衣机控制仿真系统设计

本设计借助MCGS组态软件平台,对PLC课程教学中用到的发光二极管模拟洗衣机动作的实验板进行虚拟系统开发,介绍了虚拟系统开发的具体步骤,并调试分析了虚拟系统。开发的虚拟系统画面直观,操作简单,有利于学生提高编写PLC控制程序的效率,降低学校办学成本。     

基于PLC/MCGS的交通灯控制仿真系统设计

针对交通控制系统中交通灯控制这一核心问题,选择三菱FX1S可编程控制器为控制核心部件,同时结合MCGS组态软件,构建了交通灯监控系统。利用梯形图进行下位机软件设计,在MCGS组态软件中进行上位机监控界面设计,同时将硬件与MCGS组态软件联机调试,实现了交通灯监控,系统界面友好,控制效果良好。     

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.     

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.     

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.     

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.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

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.