无线数据采集和虚拟仪器在喂入量测量中的应用

采用了基于挤压力的喂入量测量方法,综合利用先进的计算机技术--网络化的高速无线数据采集和虚拟仪器,设计了一种可用于联合收割机喂入量测量的自动化测试平台.该平台由4部分组成:传感器、信号调理系统、无线数据采集与传输系统、基于虚拟仪器的基站系统.台架实验表明:该测试平台性能优良,能够满足喂入量测量的要求.     

基于排队论的帆船多参数实时监测系统设计

设计并实现了一种采用无线传感器网络和3G移动通信技术的帆船多参数实时监测系统,可同时对多条帆船的多项技术参数进行同步监测.采用ZigBee协议组建船上无线传感器网络,实现数据采集和融合;通过3G移动通信网络建立手持终端与船上网关的远程连接,实现数据的实时传输.根据传感器数据采集、汇聚、融合、远程传输和在手持终端显示的处理流程,建立系统的排队模型,运用排队理论研究系统的性能和探索系统的设计方法.通过软件仿真和对实际应用系统进行测试,验证了该设计方法的可行性、可靠性和实用性.     

基于无线射频传感器的检测仪表设计

为克服传统油水井参数采集方法中存在的操作复杂和精度低等缺点, 设计了一种基于无线射频技术的新 型检测仪表, 详细阐述了该检测仪表的设计原理与方法。 所封装的无线射频传感器包括负责油水井数据采集 的传感器模块(压力、 电流)和将油水井参数写入至 RFID 射频卡内的 RFID 读写模块。 本检测仪表系统结构简 单, 工作稳定可靠, 数据采集精度满足要求, 改变了传统的采集数据模式。 利用该仪表采集数据, 可大幅减少 工作人员的工作量, 提高工作效率, 得到较好的启用效果。 因此表明, 所设计的无线射频传感器检测仪表是有 效的。     

基于ZigBee技术的低功耗无线温度传输系统设计

基于ZigBee无线传感器网络节点功能及温度采集参数算法,结合标准PT100输入接口,采用掌上智能终端PDA作为中继显示,设计了ZigBee低功耗无线温度数据采集及传输系统,并进行了调试和实验,实验结果表明,该系统可实现在70m范围内实时传送采集到的温度数据,系统功耗〈20mA。     

基于BACnet/ZigBee的无线智能温度传感器

为了实现智能楼宇的BACnet/ZigBee无线传感器网络,设计了BACnet/ZigBee节点互联机制,并研制出一种BACnet/ZigBee无线智能温度传感器标准设备.采用微处理电路Lm3s6911+做为温度传感器的核心控制单元,实现温度数据采集,数据的BACnet封装与解析以及BACnet报文在ZigBee无线网络中的传输过程.通过实验测试,验证了该传感器的协议一致性和数据正确性,达到了楼宇自动化系统的性能要求.     

基于C8051F350的无线数据采集系统的设计

针对在某些复杂环境下通过有线方式采集数据困难的问题,设计了基于无线收发芯片nRF905、以C8051F350为主处理芯片的无线高精度数据采集系统,给出了系统总体框图以及主要软硬件设计.在采集精度、传输可靠性方面做了一些创新性设计.利用位移传感器的数据采集实验对本系统进行验证,实验结果表明,文中设计的无线数据采集系统具有采集精度高、数据传输稳定可靠等特点.     

基于灰色预测的无线传感网络路由优化算法研究

无线传感网络路由链路节点分布混乱,导致路由算法稳定性降低,提出基于灰色预测的无线传感路由优化算法。构建无线传感器网络路由节点定位模型,实现传感器节点自主链路分层转发控制,构建无线传感节点控制模型,提高路由探测的参数识别能力;采用灰色关联预测方法,建立无线传感网络路由探测模型,根据路由探测结果,获取教务数据采集系统无线传感器网络最优节点密度分布,融合模糊度参数,构建模糊信息调度优化设计模型,定位最优自适应特征信息,实现无线传感网络路由优化设计。仿真结果表明,无线传感网络路由设计的输出稳定性较好,节点定位精度较高,传输时延较小,提高了教务数据采集系统中的无线传感器网络传输和数据分析能力。     

基于蓝牙传输的脉搏信号检测系统的设计与实现

设计基于无线蓝牙传输的脉搏信号检测系统,系统包括PVDF脉搏传感器、信号调理电路、数据采集电路、蓝牙无线传输模块和上位机数据接收显示模块.实验结果表明,该系统能够对人体的脉搏信号进行实时采集,将数据通过蓝牙无线发送到由J2ME语言编程的手机中,接收到的脉搏信号可在手机上显示波形,并可进一步对信号进行处理,进而实现远程监护.     

基于ARM和ZigBee的水产养殖水质监测系统设计

针对现有水质监测系统存在的布线麻烦、成本高、维护扩展不便等问题,将嵌入式技术和无线传感器网络技术相结合,设计了一种无线水产养殖水质监测系统.该系统以S3C2440A微处理器为控制核心,由CC2530和JG-Fourpro-485多参数水质传感器构成数据采集传输网络,通过嵌入式网关和Wi Fi模块实现监测数据的实时远程在线查询.实验结果表明,该系统监测点布置灵活,数据通信通畅有效,传输距离可达75 m左右,可满足水产养殖水质监测的需要.     

基于无线传感网络的三峡流域水环境监测系统

为解决长江三峡库区流域因幅员辽阔、地形复杂难以实施大范围水质监控,设计了一种基于无线传感网络的水环境监测系统.该系统采用无人值守的无线传感网络架构,借助分布式数据采集方式,基于GPRS通过无线网络实现鉴定检测数据的传输,提高了监测精确度,降低了对单个节点传感器的精度要求;大量冗余节点的存在,使得系统具有很强的容错性能;密集分布的节点增大了覆盖的监测区域,减少了洞穴或者盲区.讨论了环境监测系统的结构,设计了监测设备的软硬件系统,基于搭建的系统在线测试环境,给出了主要的实际水环境检测参数的测量数据.测试数据分析结果表明,所设计的系统可以满足三峡库区对水环境参数监测的需要.     

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.     

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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