基于AT89C51单片机与DS18B20的温度测量系统

介绍了单总线数字温度传感器DS18B20的特性及工作原理,给出了AT89C51单片机与DS18B20构成温度测量系统并详细介绍利用汇编语言编程实现对DS18B20访问。实际测试结果表明这种测温系统转换速度快、精度高,整个系统具有稳定性强等特点。     

DS18B20数字温度传感器在大坝位移测量系统中的应用

介绍了单线数字温度传感器DS18B20的结构、特性及工作原理,从测温电路硬件设计和坝段间离合度计算等方面探讨了DS18B20在大坝位移测量系统中的应用。     

基于DS18B20的多点温度检测系统

该文提出了采用单总线数字式温度传感器DS18B20和单片机组成的新型智能多点温度检测系统。在文中,首先介绍了DS18B20的基本特性,然后给出了相应的硬件接口电路、软件流程及主要程序代码。DS18B20具有直接输出数字信号、单总线接口、成本低等优点。经试验,基于单总线器件DS18B20的多点温度检测系统测量温度准确、测温范围宽、体积小、控制方便。     

基于MC9S08GB60芯片的DS18B20测温系统设计

基于MC9S08GB60芯片,对DALLAS最新一线式数字温度传感器DS18B20的内部结构、工作时序、基本操作指令、测温原理进行了分析。通过在实际的智能家居测温系统中应用表明,DS18B20具有直接输出温度数字量,无需复杂的A/D转换的特点,从而易于系统软、硬件的实现。     

基于DS18B20多点测温系统的改进

使用DS18B20构成的多点测温系统,通常利用温度传感器一线制总线的特点,将多个DS18B20串联在一根数据线上,通过软件查询的方式获得多点的温度数据,速度缓慢。针对上述问题,本设计提出一种改进方案,通过采用每个并行端口上连接一个DS18B20器件的方法,对多个DS18B20进行同步操作,可以快速查询多点的温度,满足实时性要求较高系统的设计需求,可广泛应用于各种工业控制、仪器仪表产品中。     

FPGA与DS18B20组成的测温系统的设计

介绍了单总线数字温度传感器DS18B 20的特性及工作原理,给出了由DS18B 20与FP-GA组成的测温系统的硬件电路和软件设计及提高测量精度的方法,通过对实际温度的测量及与专用测温仪的比较,数据准确,该系统具有接口简单、精度高、抗干扰能力强、工作稳定可靠等特点.     

基于FPGA的测温系统的设计

介绍了单总线数字温度传感器DS18B20的特性及工作原理,给出了由DS18B20与FP-GA组成的测温系统的硬件电路和软件设计及提高测量精度的方法.通过对实际温度的测量及与专用测温仪的比较,发现该系统具有数据准确、接口简单、精度高、抗干扰能力强、工作稳定可靠等特点.     

交通运输系统中的温度测量电路的设计

本系统主要由温度传感器及单片机组成,着重介绍了温度传感器DS18B20的性能特点、内部结构、测温原理及其与单片机的连接方式。     

蔬菜大棚多点温度测控系统的设计与实现

系统采用单片机和DS18B20温度传感器,构成温度的多点检测和控制系统.DS18B20通过单总线进行通信,即仅需要一条数据线(和地线)就能与中央微处理器进行通信.现场温度直接以One-wire(一线总线)的数字方式传输.适合于恶劣环境的现场温度测量,如:环境控制、设备或过程控制、测温类消费电子产品等.将DS18B20应用在蔬莱大棚的多点温度测控系统中,系统的各项技术指标均达到或超过了设计要求.     

DS18B20在数字温度计中的应用

详细介绍了一种基于高性能单片机ATmega169P和数字温度传感器DS18B20来测量温度的方法,包括DS18B20的测温原理和结构、数字温度计硬件电路的设计,以及实现温度采集和数据通信的软件设计。DS18B20是单线数字温度传感器,将其与ATmega169P结合应用在数字温度计中,具有硬件电路简单、体积小等特点,并可以在此基础上拓展温度记忆功能和上位机通信功能。而且在一根通信线上可以挂接多个传感器,特别适合测点较多、环境恶劣的测量环境。     

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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