粮食熏蒸控制系统智能通信适配器的研究

阐述了粮食熏蒸控制系统通信适配器的硬件、软件设计,该系统采用CAN总线结构,系统主要部分通信适配器。是上位管理机和现场测控节点之间通信接口．该适配器以8031单片机为处理器,以SJA1000为CAN总线控制器,软件采用模块化结构设计,由主程序、子程序、中断服务程序组成,完成数据缓冲、数据转发等功能．     

电网监控系统的CAN总线智能通信节点硬件设计

现场总线是在发展综合自动化的需要下产生的,它适应了工业控制系统向分散化、网络化和智能化发展的方向,CAN总线现已经形成国际标准,并已被公认为最有前途的现场总线之一。本文设计开发了电网监控系统的CAN总线智能通信节点硬件模块,它具有现场数据采集和控制及CAN总线通信的功能,可以通过CAN总线通信与其它CAN智能测控节点传送状态和各种参数,接收来自监控节点的命令和数据来调整和改变控制状态。     

基于CAN总线的汽车冷却液罐试验台测控系统设计

根据汽车冷却液储液罐试验台测控系统的要求,设计了基于CAN总线的分布式测控系统.采用具有CAN总线接口的输入/输出模块实现了现场测控,监控室的工业控制计算机通过CAN适配卡与各模块进行通信,详细介绍了测控软件的设计方法.     

CAN总线网络节点的实现及应用

为了安全传送现场采集的数据，选择了CAN总线作为现场总线．利用独立CAN控制器SJA1000及普通的单片机可以组成通用的CAN总线网络节点，其应用范围广泛，可以扩展成现场测控装置(开关量输入输出装置)．该装置和上位机通信可以组成简单的集散控制系统．此网络节点方案已通过调试，可直接应用到其他系统中．     

基于CAN总线的电力系统参数采集和监控

介绍一种基于CAN总线的电力参数采集监控系统，系统由主控计算机、CAN总线适配卡和多个智能测控节点组成；各智能测控点则由80C196KC微控制器和电力参数采集专用芯片CS5460A构成现场测控电路。详细介绍了由新型独立CAN总线控制器SJA1000构成的CAN总线结口电路的组成和现场测控电路的硬件设计。实践表明：该系统能对5km配电范围的10个智能节点实行高精度的数据采集和有效监控。实现了配电系统参数的数字化采集和智能化管理．提高了配电系统运行的可靠件和效率．     

基于CAN总线的电力系统参数采集和监控

介绍一种基于CAN总线的电力参数采集监控系统,系统由主控计算机、CAN总线适配卡和多个智能测控节点组成;各智能测控点则由80C196KC微控制器和电力参数采集专用芯片CS5460A构成现场测控电路.详细介绍了由新型独立CAN总线控制器SJA1000构成的CAN总线结口电路的组成和现场测控电路的硬件设计.实践表明:该系统能对5km配电范围的10个智能节点实行高精度的数据采集和有效监控.实现了配电系统参数的数字化采集和智能化管理,提高了配电系统运行的可靠性和效率.     

基于CAN总线的电力系统参数采集和监控

介绍一种基于CAN总线的电力参数采集监控系统,系统由主控计算机、CAN总线适配卡和多个智能测控节点组成;各智能测控点则由80C196KC微控制器和电力参数采集专用芯片CS5460A构成现场测控电路。详细介绍了由新型独立CAN总线控制器SJA1000构成的CAN总线结口电路的组成和现场测控电路的硬件设计。实践表明:该系统能对5km配电范围的10个智能节点实行高精度的数据采集和有效监控。实现了配电系统参数的数字化采集和智能化管理,提高了配电系统运行的可靠性和效率。     

基于CAN总线的电力参数测量系统设计

为了实时测量电力系统参数,介绍一种基于CAN总线的电力参数采集监控系统,系统由主控计算机、CAN总线适配卡和多个智能测控节点组成;各智能测控点则由AT89C52微控制器和A／D采集芯片构成现场测控电路。详细介绍了由独立CAN总线控制器SJA1000构成的CAN总线结口电路的组成和现场测控电路的硬件设计。实践表明：使用该方法完全可以测量个配电站的电力参数就,该系统能对5km配电范围的智能节点实行高精度的数据采集和有效监控。实现了配电系统参数的数字化采集和智能化管理,提高了配电系统运行的可靠性和效率,具有较好的应用价值。     

基于CAN总线智能变送器的通信实现

研究了CAN总线智能变送器测控系统的通信实现,包括底层智能变送器与CAN总线接口软硬件设计及CAN总线与上位工业监控计算机之间接口卡设计两部分.采用单片机作为底层智能变送器的微处理器,设计了单片机与CAN总线的网络接口,使底层采集到的数据传输到CAN总线网络.再设计了PCI总线与CAN总线的接口通信卡进行通信,使采集的数据能够传输到工业计算机上完成对整个现场过程进行监视.     

基于C8051F040 CAN总线的测控节点设计

CAN总线已被公认为是最有前途的现场总线之一,在汽车以及工业控制领域已得到了广泛应用。本文以集成有CAN总线的C8051F040微控制器为核心,设计了测控节点的软件和硬件。文中首先简要介绍了CAN总线测控系统构成,然后对C8051F040自带的CAN总线控制器进行了阐述,最后详细的说明了测控节点的软硬件设计方法。     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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