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A cost-effective and eco-friendly engineering method to improve biochar’s physicochemical and sorption performance is critical in various environmental applications. In this study, micro-nano-engineer...
选用山东省当前推广面积较大的“20+40”大小行、“20+40”沟播、“20+40”垄作以及常规等行距模式,研究不同种植模式对冬小麦农田水资源利用效率和边际效益的影响。结果表明,等行距、大小行、沟播和垄作种植模式的最大产量分别为7778.6、7624.8、8684.6和8893.7kg/hm2,表明沟播和垄作都具有提高冬小麦产量的潜力,但在获得最大产量时,垄作的蒸散量比沟播提高了76.6mm。...
建立了斜轴式液压变压器的排量模型、流量模型、转矩模型和效率模型;在此基础上,绘制了液压变压器的等效率曲线图,揭示了斜轴式液压变压器的效率特性。理论分析与试验结果表明:斜轴式液压变压器在正常工作情况下理论总效率可达到70%左右,而且高效区的范围较宽;液压变压器的总效率随着负载口实际流量或缸体转速的增加有先增大后减小的变化趋势,随着负载口压力或配流盘转角的增加也呈先增大后减小的变化趋势。
在对现有往复式振动筛面上籽粒的非线性跳动进行理论分析的基础上,利用LS-DYNA程序研究了往复式和两种新型多维运动筛面上籽粒的运动情况,并提出分散性衡量指标以反映籽粒在筛面上的分散情况,以此对3种筛面的筛分效率进行对比分析。研究中依据筛面与籽粒的实物结构和物料特性建立分析模型,考虑籽粒与筛面及籽粒间的摩擦、碰撞作用,求解得出籽粒的运动规律。结果表明两种新型多维筛面运动形式有利于提高筛分效率。
The aim of this study was to compare the fallow efficiencies of shallow and deep soil profiles and to examine the effects of nitrogen fertilization on the grain yields in continuous wheat and fallow-w...
This study was conducted to investigate the effect of water-use efficiency and changes in the yield-response factor of cotton irrigated with an irrigation drip system. The amount of water applied was ...
Using the 1992-1996's irrigation results, 15 different physical, economic and institutional efficiency indicators were applied to the Bursa groundwater irrigation project to evaluate the performance ...
The paper presents results of the analysis of technical and scale efficiency of 1 147 Slovak corporate farms (agricultural co-operatives and commercial farming companies) in 2000. The objective of the...
High efficiency of foreign trade is achieved in export of the commodities that are not only price competitive. The high-technology manufactures usually have the highest value added. The same is true f...
The paper is focused on the evaluation of labour productivity in industry as a whole and in the selected branches in the Czech Republic in 1997–2001. The labour productivity index for employees is the...
The aim of this presentation is to introduce partial results of this research project aimed to the efficiency of businesses working with the organic systems. The proposal of mesures will be formed wit...
The aim of this presentation is to introduce partial results of this research project aimed to the efficiency of businesses working with the organic systems. The proposal of mesures will be formed wit...
The contribution supplies an outline of indicators, through which benefits from projects will be followed, that are prepared for usage in the LFA areas. It will be necessary to use the monitoring syst...
The article summarises the results of the analysis of value added (VA) in agriculture and food industry and the share of intermediate consumption in the value added. The results show that during 1993–...
The quality of economic education is one of the economic growth factors because its increasing leads to a higher level of human resources. The efficiency of education is most often defined as the rela...

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