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土壤墒情监测是生态环境保护和建设的重要内容,为此,设计了一种城市森林土壤墒情远程监测系统;详细介绍了系统的结构和网络监测管理系统的功能。监测管理系统采用J2EE构架,具有查看实时数据、查询历史数据以及对数据进行召测和对超标值进行报警等功能。实验表明,系统性能稳定,满足土壤墒情远程监测的要求。 相似文献
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选用BDS(北斗)与GPS双模传感器、深度传感器等传感器,基于自主开发的网络服务云平台,设计农机作业远程监测系统。介绍农机作业远程监测系统的总体结构,论述各类传感器及网络服务平台的工作流程,为提高作业质量监测水平提供参考。 相似文献
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自行设计一种农作物环境远程监测系统,系统采用组态王6.55组态,集远程数据采集、远程数据传输、远程控制、自动灌溉、压力调节、流量调节、超限报警、水泵自动启停调速为一体的综合控制系统。系统实现了监测、传输、诊断、决策及作物水分的动态管理,并按照作物生长期等信息的需水要求实现自适应节水灌溉,以达到精确灌溉的目的。系统采用B/S结构,组态王Web全新版功能,管理员可通过Internet实现远程监控,克服了时间和地域的限制。同时作物现场控制级可根据需要选配太阳能供电,降低通电布线的繁琐工作,达到节约能源的目的。 相似文献
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针对CAN总线技术在农业机械上已大规模应用,但缺少将CAN总线技术与物联网技术结合的农机远程监测系统,存在专用服务器租金过高、相关软件开发周期长等问题,研究一种基于OneNet开放平台的玉米中耕变量施肥机远程监测系统。通过STM32103主控制器进行数据的处理与转化,BC20无线通信模块负责数据传输,借助OneNet平台实现PC端和移动端对于施肥机的速度、坐标、排肥轴转速等状态参数的实时远程监测。试验结果表明,整套系统数据传输延时低,性能稳定,数据传输成功率在95%以上,满足复杂田间环境工作要求。实现对于玉米中耕变量施肥机状态参数的远程实时监测。 相似文献
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为了解决花生收获过程中的实时自动测产及远程数据监测存储问题,设计了基于智能传感器的花生收割机实时测产远程监测存储系统,提出了一种新的测产机械结构和方法,并利用智能路由器加密通道建立了一套API框架体系,实现了测量数据的远程传输与实时共享。试验结果表明:收割机终端测产值与智能路由器传回至服务器的数据相对误差绝对值小于5%,数据传输速度快,具备较大的扩展性,验证了测产系统的可行性、可靠性和准确性,应用前景宽广。 相似文献
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为了提高玉米播种机的自动化水平和播种精度,通常可以采用远程系统对播种质量进行监测,包括漏播、重播及作业效率等;相同的原理,投料机投料过程中也需要对其投料的质量进行监测,包括投料的准确性和投料效率等。为此,依据播种机远程系统的原理,设计了智能投料机的远程系统,具有数据采集与传输、数据监测、分析、统计和管理及报警处理等综合功能,实现了智能投料机实时监控、用户管理、报警、数据统计与分析。为了验证远程系统的可行性,对投料机的投料效率和质量进行了监测,结果表明:远程系统可以成功地对投料质量和效率进行监测,并具有较高的监测精度,为投料机的高精度作业和降低环境污染提供了保障。 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