基于nRF905的油罐温度无线传输系统的设计

在石油化工控制、环境监测、现场监控等特定环境条件下,需要把采集到的温度信息通过无线方式上传到上位机。为此,设计了基于n RF905的温度数据无线传输系统。该系统采用数字温度传感器DS18B20采集指定地点的温度,并将采集到的温度信息传输到发送端单片机中,再传送至以n RF905为核心的无线数传模块,经无线传输模块处理后发送至接收端,接收端单片机通过串口将采集到的温度数据上传给上位机,上位机通过Labview对采集到的数据进行实时监测及报警。     

无线数据采集器的研制

设计一种基于单片机和无线传输的现场温度采集系统,该系统采用一线式数字温度传感器对现场温度进行采集,通过无线传输模块将数据传送给计算机,并由计算机进行监测。测试结果表明,该系统采集数据准确,抗干扰能力强,非常适合于工业现场应用。     

基于ZigBee的无线信号采集传输系统的研究

设计了一种主要用于矿井瓦斯气体浓度监测的数据采集与无线传输系统.此系统利用CC2430无线收发模块实现数据的采集和传输的无线化,现场的终端节点和路由节点采集数据并通过逐级跳转的方式把数据传送到协调器,协调器通过RS232串行口与PC机进行通信,以实现对设备的无线智能监控.     

柴油机工作状态单片机监测系统设计

本文介绍了用单片机对柴油机的运行参数进行实时监测的总体设计方案。被测参数经传感器转换成相应数据后送入单片机,单片机将得到的数据分析处理,测量数据可通过无线方式传送到上位机,运行参数可实时显示,异常时报警。     

一种基于移动网络的疲劳驾驶预警器的设计

提出一种疲劳驾驶预警器的设计方案。采用脉搏压力的疲劳检测算法及CS算法完成主要功能,实现对驾驶员的实时提示作用,同时,通过无线网络将压缩数据传送到监测部门。在数据的无线传送中采用CS算法,可以大大地减少上载数据的数据量,从而减少网络数据传输压力。该设计在起到疲劳驾驶提示作用的同时,也满足5G时代对智能设备数据传递量的要求。     

基于AT89S52的多功能环境监测报警装置

本装置将单片机控制技术和传感器技术相结合,将每个监测节点采集的温度、湿度、照度、二氧化碳浓度等环境监测数据以无线传输的方式传送至单片机主机控制系统,主机控制系统通过nokia 5110液晶显示器实时显示各个节点的环境监测数据.当环境监测数据超过预设范围时,主机控制系统通过GSM通信模块TC35将环境数据发送至远程终端接收器,提示进行环境参数调整.     

MiniGUI在无线温度检测中的应用

文章以MSP430作为现场控制器,通过DS18b20采集温度数据,经NRF905无线传送至接收端。接收端以LPC2210处理器为平台,实现了实时操作系统μC/OS-Ⅱ的移植,并将接收温度送MiniGUI显示。在室温下测试,系统能够稳定工作。     

无线传感网络温室环境监测病害诊断系统的构建

采用低功耗单片机ATmega8、无线通信模块SZ05以及环境因子检测传感器构建了一个无线传感网络数据采集系统.基于ZigBee无线传输协议设计温室无线传感网络,实现了对温室温度、湿度、光照度、二氧化碳浓度及反映作物病害状况的声发射信号的采集,并将数据传送至上位机监控中心进行实时监测.基于LabVIEW8.6设计上位机监测界面,对采集到的数据进行存储、显示和分析.对番茄病害种类和防治方法进行分类,建立了数据库,根据声发射信号及环境因子的变化情况,即可诊断作物的病症,并给出相关的防治方法.     

无线温湿度监测网络节点设计

给出一种基于NRF9E5、AM2301的无线温湿度监测网络节点设计。采用AM2301温湿度传感器检测环境的温湿度。以NRF9E5读取当前环境的温湿度数据并进行无线数据传送。详细介绍了节点结构、硬件电路设计并对节点进行软件测试。经实验实现了点到点无线数据通讯,系统运行稳定。     

基于无线和UDP协议的空间温度采集系统

该文提出了一种应用无线模块、温度采集模块和单片机等组成温度采集发送单元,将温度采集模块得到的温度数据组成特定协议字符串,通过无线信号发送;应用无线模块、网络模块和单片机等构成核心处理单元,接收无线信号后,进行解析,并把处理结果通过网络传送给PC机;应用VB软件编写上位机PC显示单元,对采集到的空间多点温度数据直观显示,组成一套基于无线、UDP协议的空间温度采集系统,满足大型机房对室温、机器温度的准确实时监控。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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