嵌入式温室大棚远程监控系统的设计与实现

为了实现温室大棚的远程智能控制,设计并实现了一个远程智能温室大棚监控系统。以ARM9的嵌入式中央处理器为核心,通过Zigbee无线传感器网络采集温室内的环境参数,通过LCD触控屏监控温室内温度与湿度的变化,并通过控制执行机构,调节温室环境变量。嵌入式中央控制器与手机APP通过PC机服务器建立TCP连接。服务器与手机APP替代触摸屏实现实时监测,控制外围执行机构,实现了远程监控系统历史数据查询、报警、设置参数等功能。     

基于Proteus的LED数字时钟系统的设计

随着嵌入式技术的发展与普及,单片机、ARM、PDA等嵌入式设备的设计开发变得越来越重要。但是,嵌入式设备的开发,具有周期长、设备成本高、灵活性差等缺点,严重制约了它的普及。而计算机软件仿真技术的出现解决了硬件设备昂贵、易损耗、开发周期长等缺点。该系统采用Proteus软件仿真设计实现一个简单的数字时钟系统,详细介绍设计开发的"硬件设计"、"算法设计"、"程序实现"、"调试"等各个环节。     

物联网应用中嵌入式HTTP协议的设计与实现

一旦在嵌入式设备中集成了HTTP协议,则能够利用现有先进的Web技术,实现PC机与嵌入式设备在任何时间、任何地点的信息交互,将极大地促进嵌入式设备特别是低端控制设备、仪器、仪表等的物联网应用.在此过程中,如何根据具体应用来精简标准的HTTP协议将是一个难点问题.文中以实现嵌入式HTTP协议为目的,详细分析了在实现嵌入式...     

基于STM32F401的温室害虫物理防控物联网系统

以高性能嵌入式系统ARM STM32F401作为控制核心,利用数字温度传感器DS18B20和RHD40湿度传感器及光照度、CO_2、氮磷钾NPK传感器分别采集温室内温度与湿度及其他相关参数数据,并通过Wi-Fi模块EMW3080将数据传输给上位机,上位机将数据保存到数据库进行管理,并对数据分析,作为深入研究温室蔬菜生长环境参数的调控的数据基础.需要防控害虫时,STM32F401控制相关的设备,将温度和湿度调到设定值,并保持若干个小时,达到防控害虫的目的.结果表明:在温度40℃、湿度85%~90%、保持时间4 h的条件下,系统能有效防控温室种植的豆角、黄瓜等蔬菜的蚜虫,代替了农药防控害虫,实现了温室的有机生态种植,为温室防控农作物害虫提供了一种基于物理热学的技术思路.     

基于嵌入式Web服务器的信息家电安防监控系统

提出了以基于SX52控制器的嵌入式Web服务器为核心的信息家电安防监控系统设计方案,实现了嵌入式系统与Internet相连、家庭内部的安全监视、信息传输、自动实施处理以及嵌入式设备本身性能的监控等功能。     

超高速集成电路的发展与转化

嵌入式系统(Embedded system),是一种"完全嵌入受控器件内部,为特定应用而设计的专用计算机系统";根据英国电器工程师协会(U.K.Institution of Electrical Engineer)的定义,嵌入式系统为控制、监视或辅助设备、机器或用于工厂运作的设备。随着当代科学技术的突飞猛进,嵌入式已经不再躲在幕后,作为众多系统的核心部件,嵌入式技术的先进与否已经可以折射出一个国家电子科技的发达程度。     

实验温室温度系统混杂控制器设计与分析

温室环境调控系统是一类具有离散设备控制和连续环境因子输入输出的混杂系统.传统温室控制算法大都没有考虑温室的混杂特性,采用系统建模与古典或现代控制算法控制温室环境系统,缺乏对中国温室实际情况设计控制器和分析系统的混杂特性.为此基于混杂自动机理论,结合实验温室的降温设备,设计了夏季温度混杂控制器,并分析其执行的非阻塞性和确定性.春季和夏季实验表明,该控制器能根据设定值合理及时地切换控制设备状态.此外,建立了夏季和冬季两种典型模式的控制器框架,通过分析2013年夏季至2014年夏季温室内日最低温度,得到切换两种模式的参考时间设定值,为实现温室周年连续控制提供设定参数,对实际生产控制具有指导意义.     

基于MPI网络的温室监控系统

本文在分析国内现有先进温室控制系统的基础上,结合先进工业控制网络理论,提出了基于MPI网络的温室自动监控系统。该系统以PC作为远程监控设备、PLC作为现场控制设备、触摸屏及文本显示器作为现场监控设备,采用MPI通信协议。同时,给出了基于PC和基于触摸屏的两类不同档次的HMI,分别实现网络远程监控和单温室现场监控功能。该系统投入运行后,较好地实现了工艺控制要求,控制过程稳定可靠,具有较高的性价比,是一种更经济的温室网络监控系统。     

信息家电万能遥控器的研究与设计

随着未来家庭中信息家电种类的增多,必然造成"一机一遥控器"、多种遥控器并存的现象,给用户使用信息家电带来不便.为解决上述问题,采用结合嵌入式系统、网络技术、无线通信技术以及手持移动终端技术,设计一个能够在未来家庭中管理和控制所有信息家电的、可直接与用户交互的可视化嵌入式智能设备——信息家电万能遥控器.最后通过实验验证了该方案的可行性.     

基于嵌入式IPC的卷烟机电控系统设计

国内卷烟机电控系统大部分采用"PLC+高速处理板卡"架构,为了解决该架构稳定性较差的问题,提出了一种基于嵌入式IPC控制的电控系统架构。新架构基于嵌入式IPC高速、高性能的特点,将PLC逻辑控制与高速信号处理算法集成于同一平台,利用Ethernet总线控制技术实现外围子站的组态,从而解决原有多平台架构因兼容性差带来的稳定性问题。测试结果表明:新架构很好地解决了因多平台导致的故障误检误报、系统停机等问题,提高了设备的稳定性和生产效率。     

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