基于Android的汽车热管理系统设计

对基于微控制器C8051F500的汽车发动机热管理系统,设计了系统的硬件结构、散热风扇驱动和基于蓝牙过程数据采集与传输.为了监控热管理系统的过程参数,采用Android系统的平板电脑作为系统上位机,利用蓝牙模块实现了系统指令发送、数据回送及参数设定功能,可以实现6路风扇的自动和手动调节两种控制模式.通过对汽车发动机水冷器、中冷器温度实时测量反馈控制6路风扇转速,达到了对发动机系统热工况的最佳控制.     

基于三菱控制器的导管座圈装配控制系统

发动机缸盖进排气孔的导管和座圈装配质量直接影响整机动力性能.三菱发动机装配控制系统中的压力位移监控部分由德国试达默公司的压力位移传感器和研华公司的模拟量采集卡PCI1710构成.监控软件采用VB开发,相关数据存储在工控机的数据库中,并且通过数字量采集卡PCI1713实现与PLC控制系统信号交互.该系统完全实现了装配过程中的压力位移实时监控,较之德国试达默公司的压力位移监控器每套装置节省成本三万元左右.     

基于Data Socket技术的汽车传感器网络化测试系统设计

介绍一种以LabVIEW软件为开发平台的,实现汽车电子系统中核心部分传感器信号的采集、分析、处理和显示的网络化测试系统的设计。该系统通过基于Data Socket技术的网络传输方式实现数据传输与共享,组成测试网络的上位机系统根据测试用户本身的需要从系统中获取不同的参数数据,然后通过LabVIEW软件平台对采集数据的线性化、滤波等数据处理手段,实现对车辆传感器工作过程关键参数的实时测量和监控。     

基于单片机的过程控制实验平台设计

该文开发了以单片机为控制器的温度控制实验系统,为过程控制课程提供实验平台。该实验平台以电烤箱为被控对象,设计了单片机与温度传感器、调压模块和显示模块之间的接口电路,实现温度的采集和控制作用的传输。采用C语言编写了PID和模糊控制算法执行程序,实现温度的自动控制。利用LabVIEW软件设计了监控界面,实现温度数据实时监控和响应曲线实时显示的功能。实验平台具有小巧、低成本、易于开发的特点,为学生开展过程控制实验提供了单回路控制系统设计、对象特性测试、PID参数整定、先进控制算法研究等实验项目。     

基于双机冗余的兰炭生产过程监控系统

针对兰炭生产工艺流程和安全生产的特点与要求,开发了基于双机冗余的兰炭生产过程监控系统.该系统采用工控机、PLC、仪表和以太网,构成IPC+S7-300PLC和智能仪表+工业以太网的双机冗余监控系统.系统实现了兰炭生产过程中工艺参数的实时监控与优化控制,提高了生产过程的自动化程度和管理水平.     

基于组态软件水处理厂监控系统设计

根据水处理厂工艺流程及控制要求,本文提出了水处理厂监控系统的设计方案。应用组态软件设计了监控系统,组态了系统的硬件通讯架构。系统采用PC+PLC分布式结构,以PLC为下位机,以组态王软件编写监控界面,PLC与上位机采用Profibus现场总线通信,实现对现场设备的实时监控。系统具有自动运行、远程操作、报警、数据曲线显示、报表生成等功能,并能显示水处理厂工艺流程和现场设备运行情况。     

基于虚拟仪器技术的发动机功率与扭矩的测量

运用虚拟仪器Lab VIEW为开发平台,在参照GB/T 18297～2001汽车发动机性能试验方法的要求下,研制了发动机的功率和扭矩测试系统.该系统采用电涡流缓速器作为负载,运用PID控制方式,可以实现对发动的扭矩、功率等参数测量.具有实时数据动态显示、可视化强、测量准确、数据保存、自动绘图等优点.     

基于PSCAD与PLC的供配电控制实验系统

为完善可编程控制器(PLC)控制、通讯及配电网络的设计型实验内容,开发了基于电力系统仿真软件(PSCAD/EMTDC)与可编程控制器供配电实时监控与仿真的实验系统。系统以WinCC构建监控平台,开发电力系统仿真软件接口模块,实现PSCAD/EMTDC与WinCC电气开关的控制信号和状态信息以及仿真参数的动态交互。实验教学表明开发的实验系统可以满足学生在工程背景下进行供配电网络的系统设计、实现及调试,对加强学生工程素质培养具有重要意义。     

基于iFIX的锅炉温度监控系统

根据锅炉温度串级控制系统的结构与特点,设计了西门子S7-200PLC和i FIX的锅炉温度监控系统.系统采用串级PID控制,实现了对温度的实时监控.实验结果表明,系统响应速度快、稳定时间短、控制精度高.     

精准滴灌施肥监控系统的实现

为提高滴灌施肥过程的自动化水平,实时掌握生产过程信息,实施精准作业,设计并实现了一个以IPC+PLC为中心的精准滴灌施肥监控系统。该系统通过人机界面设置与作物在不同生长阶段的养分需要相匹配的施肥参数,由IPC通过PLC对控制对象的参数作巡回检测并实时显示,根据测得的参数数据由PLC按照PID控制算法运算后获得控制信号量,作用到执行机构,对被控量进行自动调节,可实现滴灌施肥过程的精准监控。     

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     

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

正~~