基于无线通讯的水源井RTU设计

为了满足远程监控水源井的要求,选用RTU来实现远程监控.设计了RTU的基本硬件电路,采用MAX706芯片组成的电路作为系统的复位电路,利用无线通讯组网方式实现远程监控和数据传输,并设计了防止电台长发射电路.结果表明,采用无线电台组成的网络可以很好地实现水源井的远程监控.同时,设计的防止电台长发射电路解决了以往存在的电台长发射问题,RTU在保证运行的稳定性基础上,降低了成本,但对该系统功能的拓扑仍需进一步探讨.     

程序可远程升级的数据采集终端的设计

针对数据采集终端的软件远程升级和维护困难的问题,提出一种程序可远程升级的数据采集终端软件的软硬件设计实现方案.硬件上设计升级程序接收存储器和升级过程状态存储器电路,并通过系统软件设计保证远程升级的可靠性.     

基于USB数据采集技术的远程虚拟测试系统

为适应网络化测试成为测试技术的发展方向,将虚拟仪器技术与USB接口技术相结合,USB总线可以实现对数据实时高速的采集,把采集数据传送到主机后再通过LabVIEW的网络通信功能进行数据的远程传输,通过USB接口模块硬件和软件的设计方法,阐述了LabVIEW开发平台上网络化传输的实现方法.     

基于工业以太网实现上位机对远程PLC的监控

以西门子交换机构成的100 Mbit/s光学冗余环网为例,详述了网络系统的硬件构成,以及上位PC机与远程PLC之间基于TCP/IP协议的以太网卡的组态方法.上位PC机监控软件采用WinCC组态,对生产工艺流程进行实时监控.PLC为现场控制器,配合各种检测设备对现场数据进行采集,对现场设备进行相应的控制.网络通断是实现远...     

基于VC开发环境下的油田远程监控系统的设计与实现

油田远程监控系统可以实时采集油井的各项专业数据并分析显示抽油机井的工作状态.该系统的硬件部分负责采集油井的各项实时数据并将这些信息经无线网络发送给具有固定IP地址的监控中心,监控中心的服务器端软件将采集回来的数据解析到数据库,同时分析油井所处的各种状态.监控系统的客户端软件将服务器端分析出的数据以用户需要的方式组合并显示.本文给出基于VC开发环境下的油田远程监控系统的设计与实现.     

嵌入式网关在远程视频监控中的应用研究

设计并实现了一个基于ARM微处理器的CAN/Ethernet嵌入式网关,并将其应用于远程视频监控系统中.监控前端控制摄像头采集视频数据,压缩之后通过CAN/以太网嵌入式网关实现视频数据和控制信息的远程交互.其硬件系统由集成了CAN控制器的ARM微处理器LPC2294、网卡芯片RTL8019AS以及CAN收发器组成.软件...     

低碳理念在GSM温室远程监控系统设计中的应用

低碳设计理念越来越受到人们的关注,如何实现节能减排需要科技创新.采用风光互补供电系统作为GSM温室远程监控系统供电设备对系统提供电能,同时,系统设计从硬件和软件双方面考虑如何实现整体低功耗,在器件选型上采用低功耗器件,在软件的设计方面融合休眠设计思想,并将低碳设计理念运用在GSM温室远程监控系统的设计中.设计集合新能源无污染可持续利用的特点以及GSM温室远程监控系统的自动化管理优势,具有很好的推广价值.     

电能自动远抄系统的电量采集与计费软件的设计

随着电力事业的迅速发展，电能量由人工采集和计费转向计算机系统进行远程自动采集和计费，针对远程采集与计费管理系统的特点，对系统的硬件和软件实现进行设计和规划，系统的硬件采用扩频低压载波表 集中器 上位机，软件采用Powerbuilder7.0 SQL Server7.0。     

基于单片机和CPLD的双控制器RTU设计

针对广泛应用于电力、矿山、石油等工业部门的SCADA系统的过程控制子系统中的远程监控单元RTU进行了分析、设计.利用复杂可编程器件CPLD和单片机组成双控制器,对传统的RTU加以改进,阐述了新型监控终端的设计思想,描述监控终端的设计与实现过程.新型RTU简化了传统RTU的硬件设计,提高性能,降低成本.     

基于LabVIEW的虚拟示波器设计及应用

以虚拟双通道示波器设计为例,介绍了基于LabVIEW 7 Express和PCI-6024E数据采集卡的虚拟仪器设计过程,并对虚拟函数发生器送出的信号进行采集和频谱分析.实验证明,虚拟示波器实现了传统示波器的基本功能.通过软件修改,开发出了不同的虚拟仪器,实现了一卡多用,增强了系统的灵活性.将虚拟仪器技术与网络技术结合进行远程数据采集,充分发挥了虚拟仪器的优势,最大限度地实现了硬件资源共享.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with