搜索结果: 151-165 共查到“知识库 农业经济学”相关记录1646条 . 查询时间(0.866 秒)
基于时空约束的大规模农产品时间柔性生产计划网络优化研究
农产品 生产计划 时间柔性
2015/5/11
随着农村土地有偿流转, 农民专业合作社、农业企业等各农村经济实体拥有大规模的土地, 为实现农产品规模化生产和集约化经营, 各农村经济实体需要根据土地资源、农业信息、生产技术制定农产品生产计划。鉴于此, 本文主要针对农产品生产计划决策问题先后建立网络、线性和非线性模型。首先根据农产品生产的时空特性和农产品生产时间柔性引入网络流规划构建网络模型;通过网络流量平衡分析, 推导网络模型应满足的约束条件, ...
滴灌条件下容重对压砂土壤水分入渗规律的影响
点源入渗 容重 种植年限 双重介质
2016/12/21
研究土壤容重对压砂地点源入渗的影响规律,为西北旱区发展砂地滴灌技术提供实际理论依据. [方法] 通过室内模拟土槽试验,以裸地(无植被和压砂)为对照组(CK),研究了土壤容重(1.23,1.38,1.53 g/cm3)对不同种植年限压砂地(新压砂地、中压砂地、老压砂地)砂石层和土壤层两相介质点源入渗规律的影响. [结果] 压砂土壤点源垂直累积入渗与其容重和种植年限皆呈负相关关系,压砂土壤在入渗初期,...
The least developed countries – the case of the Congo D.R.
agriculture conflict economic growth food security poverty
2015/3/31
The article is focused on food problem in the least developed countries, on the chosen areas where the overall situation is the most problematic. It deals with the Democratic Republic of the Congo, be...
Application of the DEA on the measurement of efficiency in the EU countries
agricultural sectors in the European Union agriculture
2015/3/4
Th e purpose of the paper is to investigate the relative technical effi ciency of the agricultural sector in the European Union (EU) using the Data Envelopment Analysis (DEA) during the period 20...
Rural tourism development and financing in Romania: A supply-side analysis
bank lending, fi nancing constraints rural development rural tourism businesses
2015/3/4
For more than a century, and almost everywhere in the world, rural areas suff ered a steady decline, due to the decrease of the real income from the agricultural activities, the lack of serious ...
Agricultural exports and economic growth: Empirical evidence from the major rice exporting countries
export-led growth rice exports vector error correction model
2015/3/4
Th is study investigates the evidence of the export-led growth in major rice exporting countries using the extended production model. In addition, a special attention is paid to sectoral exports, whic...
Evaluation of the state of the Business Intelligence among small Czech farms
agriculture information systems multidimensional database
2015/3/4
Business Intelligence (BI) can assist in agricultural enterprises to strengthen their production potential and technical effi ciency due to its eff ective support to the managerial, analyti...
An ex-ante impact assessment of the Common Agricultural Policy reform in the North-Western Romania
Agri-Environment Schemes (AES) bio-economic mode
2015/3/4
Th e paper aims to assess the impact of the Common Agricultural Policy reform (post 2014) in the environmental
vulnerable areas from Romania. It proposes a bio-economic dynamic farm model calibrated...
城镇化和工业化吸收了大量农村剩余劳动力，导致农业生产投入要素失衡，加剧了农副产品消费需求和产出供给的矛盾，产生价格上涨压力。基于“缺口-价格”模型的实证研究显示，负向农业产出缺口对农副产品价格具有滞后1—3期的直接正效应，18个省份分地区面板回归验证了直接价格效应的存在且滞后期为3—4期；工农业产出缺口存在长期均衡关系，但短期内两者的影响弹性不显著。由此可知，农业产出缺口对通货膨胀存在直接效应和间...
改革开放推行的农村土地制度改革促使农业飞速发展，但是近年来，农业投入增长缓慢，农业用地向非农用地转化，出现了农业发展缓慢的现象。新制度经济学认为制度是经济增长的决定因素。依据这一观点，基于农业发展的角度进行分析，我们发现农业发展缓慢的根本原因就是当前的农村土地制度。当前所实行的分散经营的土地制度制约了农业利润率，对要素的吸引力不够，造成农业要素投入偏少，这最终导致农业发展缓慢。针对当前土地制度对农...
探讨黄土高塬沟壑区王东沟流域1986—2013年间农业生态经济系统演变过程,分析不同演变阶段农业生态系统和农业经济系统间的耦合态势,为该地区经济社会可持续发展提供参考. [方法] 基于黄土高塬沟壑区王东沟流域长期监测数据和农户调查资料,建立了农业生态经济系统综合评价指标体系,应用耦合度模型对农业生态经济系统演变过程中的耦合态势进行了分析. [结果] (1) 黄土高塬沟壑区王东沟流域1986—201...
基于资金盈亏平衡的江苏省耕地保护区域补偿研究
耕地保护 区域补偿标准 耕地赤字/盈余 资金盈亏平衡
2016/12/21
基于资金盈亏平衡视角对江苏省进行耕地保护区域补偿的系统性研究,为耕地保护制度的完善提供理论支撑与实证借鉴. [方法] 尝试将耕地资源非市场价值纳入耕地保护补偿分区的影响因素,运用补偿标准调整耕地需求量进而倒推补偿分区,测算资金在区域内封闭运行时各地区耕地保护补偿或受偿金额. [结果] (1) 2010年江苏省耕地保护区域补偿价值标准为5.685元/(m2·a)(包括耕地经济、社会和生态价值补偿标准...
Prediction of profitability of topworking in older apple orchards under contemporary economic conditions of the Czech Republic
apple orchards top working economics costs profit cultivars tree densities rootstocks yields
2015/1/20
In the Czech Republic, there is still a predominance of obsolete apple orchards that were established more than 15 years ago and that are not profitable under contemporary conditions. Typical features...
长输管道植被恢复及关键种植技术
长输管道 植被恢复 土壤理化性质 种植技术
2016/12/21
分析西气东输二线工程(西段)水土保持植物的降水、土壤等条件,选择适宜作为管道绿化用草的草种. [方法] 采用观察现场实地监测的办法,研究了扰动后的土壤性质变化、自然降雨及土壤等自然条件对人工植被恢复效果的影响. [结果] 筛选确定了既具备生态适应性,又实用、经济的紫花苜蓿、冰草、芨芨草、草木樨等4个适生优良草种的种植设计、种植方法,监测了其在不同施工区的生长发育状况. [结论] 对管线进行合理植物...
Economic evaluation and design of control mechanisms to determine the concentration of juices
control mechanism design of experiments electrical impedance food quality net present value
2014/12/18
There is a significant attention paid to food analysis in the context of authenticity monitoring in the food industry. Although this has focussed increasingly on food safety and authenticity, the agro...