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针对粮仓的信息采集要求,结合嵌入式Web,设计了一种粮仓信息采集远程监控系统.该系统由粮仓现场检测系统、Web服务器、远程监控中心3部分组成.Web服务器通过RS-232标准串行接口与粮库现场测控器通信,经光纤以太网与远程监控中心交互信息.粮仓现场测控器采用89C51单片机,通过温湿度传感器采集信息,将采集的数据经过处理后通过串行通信接口上传到Web服务器.基于嵌入式平台进行嵌入式Boa服务器的设计和Boa监控软件的开发,远程用户可方便地实现对粮仓信息采集的监控. 相似文献
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针对现有电网电能质量监测仪存在的问题,设计一种基于ZigBee无线通信技术的电能质量监测系统。介绍监测节点与路由节点的设计方案,探讨监控中心系统的软、硬件架构和基于ZigBee技术的WSN组网方案与算法。试运行结果表明,该系统能够对电网中各监测点进行远程电能质量监测,为电网的优化运行提供依据。 相似文献
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基于ZigBee和3G技术的设施农业智能测控系统 总被引:7,自引:0,他引:7
为满足设施农业对精准控制与实时视频的要求,提出将基于ZigBee与3G技术的无线远程传感网络应用于设施农业中,构建一种高效的设施农业远程精准测控系统.该系统通过ZigBee无线传感网络实现本地环境信息的无线采集并上传到嵌入式服务器端.通过3G网络与Internet无缝连接,实现大范围的无线接入,采用B/S模式,实现远程实时监控环境信息与视频信息.通过内嵌的专家系统模型,实现自动化、智能化控制.试验结果表明,该系统性能稳定,信息无线采集与传输、环境自动调控及远程可视化调控均达到实际需求,同时具有很高的实时性及可扩展性. 相似文献
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《中国农机化学报》2017,(8)
为提高温室管理水平与生产效益,本文以西瓜为例研发基于模糊控制包含环境信息采集模块、服务器管理平台、STM32单片机控制模块和远程监控中心的西瓜温室远程监控系统。环境信息采集模块通过传感器节点采集温室内的空气温湿度、光照强度、二氧化碳浓度、土壤湿度、土壤pH值和土壤EC值,利用ZigBee协议进行组网并通过物联网网关和GPRS网络实现数据传输;STM32单片机控制模块控制滴灌系统、通风扇、加热线、灯带和湿帘的运行;利用模糊控制技术以温湿度为例结合西瓜不同时期的生长特性设计模糊控制器,对温室环境变量进行多变量去耦合控制;远程监控中心通过界面友好的APP客户端进行远程监控。试验表明,该系统能够实现西瓜温室的远程智能化管理,使作物处于最佳生长状态。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献