共查询到20条相似文献,搜索用时 62 毫秒
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基于ZigBee技术的水稻自动灌溉控制系统设计 总被引:1,自引:0,他引:1
为了加快农业生产的数字化和信息化的发展,提高农田灌溉中的生产效率,采用单片机技术、ZigBee以及组态等技术设计开发了一种远程灌溉监控控制系统。该系统由监控计算机、主控制器、分控制器等组成。分控制器由传感器、电源模块、太阳能电池板、电磁阀组成,通过传感器把现场的池块温度、土壤含水率、池块水位采集回来,将数据打包后通过GPRS发送到监控终端的上位机;上位机软件接收并处理数据,根据相应的预设参数和采集回来的参数,发送相应的命令给现场。该系统能够控制电磁阀的动作,连续运行未发生故障,可实现无人值守的远程灌溉监控。 相似文献
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为实现对大规模养鸡场内环境的远程监控,设计了基于ZigBee无线传感器网络和以太网技术的远程监控系统,可以对鸡舍内的温度、湿度、光照以及红外报警等信息进行实时采集和远程监控.该系统采用SPCE3200单片机、UZ2400射频收发器组成符合ZigBee协议规范的星型网络结构,利用ENC28J60以太网控制器实现数据远程传输.实验证明,该系统性能可靠,具有良好的实时性和扩展性,可应用于其它相近场所. 相似文献
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设计一种免耕播种机实时监控系统,该系统主要由传感器、控制器和通信模块组成,可以实时监测播种机的运行状态和环境信息,并将数据传输至远程终端。该系统的设计实现了对免耕播种机的实时监控和控制,提高了农业生产的效率和准确性。 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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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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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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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