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耙齿式残膜回收机自动脱膜机构设计
优化 残膜回收机 响应面分析 脱膜率
2017/11/23
针对耙齿式残膜回收机回收残膜后缺乏自动脱膜机构的现状，设计了耙齿式残膜回收机自动脱膜机构。分析平行四连杆脱膜机构的运动稳定性可靠性及脱膜顺畅性，设计液压装置进行脱膜，并在试验的基础上优化机构，对不同形式刮板进行试验及分析并最终设计适合耙齿式残膜回收机的"倒八字"型刮板。针对影响自动脱膜机构工作效率的关键部件和影响因素分析其运动及受力情况，对"倒八字"型刮板进行影响因素的响应面分析。可得齿板距、刮板...
回收后的废旧地膜与棉秸秆、根茬等杂质缠绕不易分离，不能实现二次利用，为实现废旧地膜循环再利用和从根源上解决废旧地膜对土壤环境的污染问题，通过对棉秸秆、根茬及地膜在风场中进行运动学分析，测定其悬浮速度，并以此为基础设计了滚筒筛式废旧地膜杂质风选装置，介绍了机具的整体结构、工作原理及关键部件。通过正交试验确定了最优工作参数组合，试验结果表明当旋转筛筒转速为30 r/min，风管出口风速15 m/s时，...
收获开沟埋草一体机双圆盘开沟机构设计与参数优化
免耕 开沟播种 双圆盘 提升装置
2017/11/23
为提高已研制的稻麦联合收获开沟埋草多功能一体机免耕播种时的开沟播种质量，设计双圆盘开沟机构与一体机相结合。为获取影响双圆盘开沟机构作业质量因素的最优参数，以机器前进速度、开沟器入土深度、开沟器排种管固定装置固定孔中心点至排种管出口中心点横向距离为试验因素，以种子入沟率、各行播种量稳定性变异系数、播种均匀性变异系数为试验指标，进行三因素五水平二次正交旋转组合试验。试验结果表明：各试验因素对于种子入沟...
针对现有温室移动机器人沿边导航技术的精度与实时性不足等问题，提出了一种基于光电开关圆弧阵列的沿边导航方法。提出了基于圆弧阵列理想目标带原理的位姿检测与调控方法，并建立了基于光电圆弧阵列信号触发数与触发中心序号双指标的位姿检测模型，按照双指标的不同阈值进行车体位姿状态归类并触发相应调控轨迹程序，进而根据由该双指标数值计算得到的位姿给定各调控轨迹参数，实现实时的沿边导航。试验结果表明，在0.15 m/...
Drying characteristics of eggplant (Solanum melongena L.) slices under microwave-convective drying
energy modelling microwave effective moisture diffusivity artificial neural network
2016/12/9
A laboratory scale microwave-convection dryer was used to dry the eggplant fruit, applying microwave power in the range of 270–630 W, air temperature in the range of 40–70°C and air velocity in the ra...
The contribution contains results of bonded joints strength tests. The tests were carried out according to the modified standard ČSN EN 1465 (66 8510):2009. The spruce three-ply wood of 4 mm thic...
为预测无线传感器网络通信质量并指导节点部署与拓扑控制,研究提出小麦农田信道多尺度建模方法.根据农田作物生长态势及其与信号传播路径的相对关系,提取环境关联参数.按作物遮挡程度不同,分别提出和采用对数模型与概率分布模型进行描述分析,结合实测样本数据对模型因子进行拟合,建立了小麦农田多径衰落信道下的经验模型并进行模型评价.结果表明,无遮挡条件下采用环境关联参数拟合的大尺度模型结果的相关系数在0.98以上...
Least developed countries – comparison
economic situation international trade foreign direct investments official development assistance remittances indicators of health
2014/3/31
The inter-related causes of food insecurity in these countries are mainly the long lasting civil wars, a limited access to land, environmental degradation, climatic shocks and the rapid population gro...
Determinants of the Korean agricultural trade with the LDCs and the OECD countries
agricultural trade patterns duty-free market access gravity model preferential tariff
2014/3/31
The study aims to analyze Korea’s import trade in agricultural products with (i) the least developed countries (LDCs) and (ii) the Organization for Economic Co-operation and Development (OECD) countri...
Crop plan optimization under risk on a farm level in the Czech Republic
crop plan crop rotation constraints optimization stochastic programming.
2014/3/31
The precise agricultural operations research models claiming complex solutions and specialized software tools may appear too complicated to truly support the decision making process on the farm level....
Consumer behavior on low-carbon agri-food purchase: a carbon labeling experimental study in China
carbon labelling low-carbon awareness potential consumption power scenario experiment SNK test
2014/3/31
By adopting the scenario experimental methodology of carbon labelling on agri-food products, coupled with 873 questionnaires collected from six cities in China, we made a statistical analysis of diffe...
The comparison of the cost-rate and profitability of the agricultural products in the SR and CR
comparison costs yields economic result profit profitability
2014/3/29
The article deals with the comparison and evaluation of the development of economic indicators, such as the costs, yields, economic result and profitability in the Czech and Slovak Republics for the p...
Czech consumers′ evaluation of choosen meat products
meat products evaluation preference consumer CzechRepublic
2014/3/28
The article summarises the main results of the analysis of the perception of selected meat products in theCzechRepublic (i.e. the following types of salami: Gothai, Famer′s, Tourist, Poličan, chi...
Multivariate statistical methods as a tool of financial analysis of farm businesses
financial analysis financial ratios multivariate statistical methods correlation analysis discriminant analysis cluster analysis
2014/3/26
The paper is focused on the evaluation of the possibilities of analysing the relations between economic and financial indicators of farm businesses by the application of multivariate statistical metho...