共查询到20条相似文献,搜索用时 62 毫秒
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无土栽培模式在我国的应用逐渐广泛,但基质栽培袋的机械化生产发展缓慢,造价昂贵的流水线式生产模式并不适合我国个体用户及中小企业的生产情况。为此,针对市场上缺乏小型、实用、低成本、自动化的基质袋生产设备的现状,设计了三边封基质自动包装机。机具在基质包装领域创新使用先装填再制袋的方法,采用PLC为核心的控制系统,由搅拌装置、定料装置、压缩装置、热封装置、换膜装置、机架、传动系统和控制系统组成。在此,介绍了整机的工作原理及各个装置的设计情况,并对整机的生产功能进行了试验验证。结果表明:三边封基质自动包装机能够自动化完成基质袋的生产,生产速率为36袋/h,包装质量满足设计要求,为无土栽培产业的机械化发展提供了技术支持。 相似文献
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我国农业机械化经营收入对农民增收的贡献 总被引:2,自引:2,他引:0
为进一步把握农业机械化对农民增收的贡献,对我国农业机械化经营性服务的产生、发展以及目前自购自用机户、农机户和农户这3种主要农机使用方式下,农业机械化对农民增收的效应和内涵进行了分析;指出我国农业机械化经营收入已成为农机化发展和农民增收的一条重要途径.为此,运用灰色理论分别建立了农业机械化经营收入和农民人均纯收入预测模型,经检验具有很好的拟合精度.其预测结果显示:到2010年,我国农业机械化经营收入对农民增收的贡献可达到6.51%.其结果可为农业机械化发展决策提供参考. 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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《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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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
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