基于车载视频监控系统的设计

本文着重探讨了基于ARM9内核和Windows CE平台的图像采集、数据传输系统的设计,完成了USB摄像头驱动软件的开发,并提出了Windows CE平台下通过USB转CAN总线来提高数据传输以便远距离实时显示图像数据的方法,最终实现了Windows CE平台下视频图像的采集、传输和显示。     

基于CAN总线和嵌入式USB主机的智能溶解氧传感器系统的设计

为了将水产养殖中的溶解氧进行采集并可靠地远传和存储,设计了基于CAN总线和嵌入式USB主机的智能溶解氧传感器系统。将CAN总线应用到水产养殖的现场环境中,利用CAN总线的实时性、可靠性和灵活性,能够实时显示水环境中的溶解氧含量,并可以与上位机进行通信。嵌入式USB主机可以脱离PC独立运行,将采集的数据保存到移动USB存储设备中,扩展了系统的存储容量。该系统为溶解氧浓度的控制提供了可靠的数据,具有良好的应用前景。     

基于DSP的语音信号实时采集与处理的研究

为实现语音信号实时数据采集与处理,本文设计了以DSP为核心的、基于USB2.0的信号采集与处理系统.该系统利用DSP的高性能数据处理能力,提供了能从麦克风获取实时语音信号并加以分析的方法,同时实现了DSP与PC机之间的数据高速、可靠的传输.     

基于DSP和USB2.0的数据采集系统的设计与研究

介绍一种基于USB2.0接口和DSP TMS320F2812的多路高速数据采集系统的工作原理及其实现.该数据采集系统中采用TI公司DSP芯片TMS320F2812和16位并行输出的模数转换器ADS8364实现对多路数据的实时采集处理,最后采集的数据通过CY7C68013实现的USB2.0接口传到上位机,由上位机对数据进行具体分析和处理并将结果和用户的设置传给DSP进行数据采集的控制.实验证明该数据采集系统具有结构简单、可靠性高、采集精度高,传输速度快和性价比高等优点具有一定的实用价值.     

面向实时控制任务的高速数据采集存储方法

提出一种基于CAN总线,面向实时控制任务的高速数据采集存储方法.该方法将数据实时采集、系统实时控制、数据存储与显示分配在相互独立的处理单元中实现,处理单元之间通过独立的CAN网络进行通信.该数据采集方法解决了数据实时采集与系统实时控制之间的矛盾.利用队列技术,该方法解决了数据存储与数据实时显示之间的矛盾.该数据采集存储方法已成功应用到某大型仿真系统中.     

基于CAN总线的液位数据采集传输系统设计

根据水池液位连锁问题,提出并设计了一种采用CAN协议总线作为数据传输手段,利用单片机和外围电路构成的采集传输系统.该系统可以对液位高度进行实时采样和显示,若超出规定水位上下限时发出报警信号,同时液位数据经CAN驱动送CAN总线上传输.     

基于C/S构架的无线传感器网络在粮库监测系统中的研究

针对目前有线粮情监测系统的局限性,运用ZigBee无线通信技术与CAN总线相结合方法实现粮库中温、湿度数据的实时采集.系统由CAN总线连接多个ZigBee无线网络组成,各个无线网络采集温、湿度信息通过路由节点连接CAN总线进行传输,由工业控制计算机对数据进行分析和处理,从而达到对粮库内环境的监测与保护.该系统具有布网灵活、节点扩展方便等优点.温度误差小于±1.0℃,湿度误差小于±5%RH.     

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Intel Edison的嵌入式实时图像采集传输与录制系统设计

基于Yocto Linux的Intel Edison嵌入式开发工具,设计并开发了一套实时图像采集传输及录制系统.通过USB摄像头对图像进行采集,并将图像数据通过视频服务器MJPG-Streamer传输到外部移动设备上,同时通过Intel Edison开发工具调用OpenCV图像库对图像数据进行处理及保存.测试结果表明,系统具有良好的实时性、高分辨率、低成本及易于拓展升级等优点.     

基于CAN总线技术的船载气象仪网络化改进设计

文中设计和实现了一种用于传输实时观测数据的CAN总线网络传输模块。该模块采用基于AVR单片机的嵌入式系统集成设计方案,在兼容原有设备的基础上,为其增加了气象传感器实时观测数据的CAN总线通信功能。通过该设计方案,使原来的单机气象观测设备变成船舶电子系统CAN网络中的测量节点。这一设计特点大幅提高了实时气象数据的传输效率。通过CAN总线通信试验测试,证明所开发的通信模块运行稳定可靠,数据传输及时准确,可完全满足实际应用的需要。     

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

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