基于Zigbee技术的煤矿瓦斯报警监控系统设计

针对目前煤矿有线监控系统信号传输的弊端,采用基于Zigbee的无线传感器网络技术,设计一种矿井瓦斯监控系统。实现了矿井的无线实时监控,避免了网络布线,从而降低了设备成本和有线信号传播的干扰,提高了矿井作业的安全性。     

基于LABVIEW的多传感器火灾远程监控报警系统的实现

室内火灾的监控重点在于对环境信息(温度、火焰、烟雾等)的监控,因此设计具有多传感器采集模块,能实时、准确地对火灾进行监控和报警的系统才能有效地避免灾难的发生。本多传感器火灾远程监控报警系统选用C8051F020单片机,由温度传感器、烟雾传感器、火焰传感器组成的多传感器模块能采集丰富的环境信息,通过SIM300GSM模块实现了火灾的远程报警,基于LABVIEW的火灾监控报警平台能够实现火灾的实时监控、判断和报警。     

煤矿安全生产实时监控系统分站节点设计方案

给出了适合煤矿安全生产实时监控系统的分站节点设计方案,并对其主要部分:功能设计、硬件电路设计及软件设计分别进行了介绍。结合对矿井现场数据的分析,详述了采用不同信号类型的传感器对矿井现场数据安全采集的方法和软硬件双重滤波方法,简述了与控制中心进行通信的CAN协议。应用该方案构成的实时监控系统,可以增强数据的准确性和传输通道的稳定性,进一步保证了实时监控系统的可靠性。     

基于嵌入式技术的矿井安全监控平台构建

针对传统矿井监测系统成本高、兼容性弱、移动性差、覆盖范围有限等缺点,构建了一款新型的矿井安全监控系统。该系统以ARM9嵌入式芯片S3C2410X为硬件,嵌入式操作系统Linux为软件,重构井下监控分站,用ZigBee无线传感器网络取代有线网络实现井下监测数据的传输。井下的Zig Bee数据采集节点负责采集矿井的环境参数、井下工作人员的位置信息,并通过无线网络发送到井下监控分站,井下监控分站通过"CAN总线+以太网"方式将井下数据传输到地面监控中心。实验结果表明,该系统稳定、可靠、实时性好。     

无线粮仓温湿度语音监控系统的设计

针对传统粮仓温度监控系统采用电缆传输采集数据存在布线繁多、易损坏等问题,设计了基于数字式温湿度传感器DHT11的无线粮仓温度语音监控系统.系统中利用数字式温湿度传感器DHT11实现温湿度采集,借助无线收发芯片nRF24L01进行采集数据的无线传输,选用单片机STC12C5410作为核心控制器,进行采集信号的处理、传输.通过液晶触摸显示屏JM320240F显示采集的温湿度,采用语音模块XF-S4240进行语音播报及报警信号,实现了粮仓的温湿度无线语音监控.     

基于PLC的煤矿水仓水位监控系统

为了预防矿井水灾及防止淹井事故发生等问题,针对矿井水仓水位的监测系统进行了研究。利用西门子S7-200PLC和WinCC组态软件联合开发了煤矿水仓水位监控系统,采用PROFIBUS现场总线实现了下位机与上位机PC的数据通讯。通过实验室模拟,实现了水仓水位的实时监控,该系统具有产生报警信息、实时趋势曲线、历史曲线与数据报表等功能。该系统具有自动化程度高、易扩展、工作可靠、安装简单等特点,可为煤矿排水系统的管、控、监一体化提供保证。对煤矿排水系统的监测监控具有一定的理论指导意义与实用参考价值。     

基于CAN总线的矿井通风监测系统的设计

为监测矿井通风状况,设计了基于CAN总线的矿井通风实时监测系统。主要介绍了CAN总线监测节点、PCI-CAN总线智能适配卡以及监测系统软件的设计。系统通过CAN总线与监控主机连接进行通信,完成对大规模节点温度、风速等数据的实时监控。该系统较传统矿井监测系统传输距离远、监测节点数量多、实时性及可靠性强。     

危险气体报警器的研制

基于气敏传感器设计了一种危险气体监测报警系统,该系统通过单片机实现其控制功能,主要包括数据采集、控制、报警、无线发射接收、电源供给等5个模块.整个系统能对危险气体浓度进行实时监测采集,超过界限能进行声光报警,并能将报警信息通过无线方式进行有效的传输,进行语音报警.该报警器可用于环境监测、生产过程中的监控及气体泄漏报警等.     

基于USB数据存储的工况采集器设计

针对港口岸桥起重机的状态检测,本文提出了一种基于TMS320C6713和USB2.0技术的数据采集系统。由传感器测量到的振动、应变、温度等信号,通过DSP模块采集存储,再经由USB总线传输给上位机。主要介绍了其硬件系统的方案配置。     

一种非接触式车辆自动报警系统

设计一种非接触式车辆报警系统。系统基于红外人体热感应原理,传感器接收人体所发射的10um波段附近的红外线,经过信号采集,放大处理,输出控制信息,产生报警信号。传感器安置在汽车的周围,可以对车辆全方位进行监控,适用于特殊车辆的保护。     

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