China's grain production cost has risen constantly since 2003. This paper starts from the grain production cost changes of unit area and unit quality,to analyze the reasons for China's grain production cost ch...China's grain production cost has risen constantly since 2003. This paper starts from the grain production cost changes of unit area and unit quality,to analyze the reasons for China's grain production cost change in the last decade. It points out that the direct cause of changes in grain production cost is the steady growth of material and services costs,the fastest growth of labor costs and fast growth of land costs. The indirect cause of grain production high cost is the low efficiency in numerous and dispersive farmer production management,obviously insufficient agricultural infrastructure construction,waste phenomenon grain in production process and low contribution rate of agricultural technology.On this basis,it is recommended to reduce China's grain production cost and improve grain production conditions.展开更多
This research indicates that with the changes in economic cycles, China's production costs are experiencing "wave-shaped" spiral growth. From 2004 to 2008, China's grain production costs increased ra...This research indicates that with the changes in economic cycles, China's production costs are experiencing "wave-shaped" spiral growth. From 2004 to 2008, China's grain production costs increased rapidly, with the primary driving force the rapid growth of labor, land and material costs. In the middle stage of industrialization, China's grain production costs will experience spiral growth following economic cyclical fluctuations, entering relative stability after a certain period. From 2009 to around 2012, grain production costs will drop, but average production costs may be higher than in the current upward cycle. From 2013 to around 2020, grain production costs will rise again and be much higher than in the current upward cycle.展开更多
基于某公司针对Φ12 mm HRB400E热轧带肋钢筋进行的“提锰降钒”生产实践,参考Mn和V的强化机理,统计并分析了两个时期内轧制该规格钢筋的化学成分及力学性能。结果表明:在HRB400E生产实践中,质量分数为0.001%的V对屈服强度的影响近似相...基于某公司针对Φ12 mm HRB400E热轧带肋钢筋进行的“提锰降钒”生产实践,参考Mn和V的强化机理,统计并分析了两个时期内轧制该规格钢筋的化学成分及力学性能。结果表明:在HRB400E生产实践中,质量分数为0.001%的V对屈服强度的影响近似相等于质量分数为0.020%的Mn对钢材屈服强度的影响。展开更多
基金Supported by The Humanities and Social Sciences Planning Fund,the Ministry of Education(10YJAZH088)Humanities and Social Sciences General Project,Tianjin Municipal Education Commission(20142404)
文摘China's grain production cost has risen constantly since 2003. This paper starts from the grain production cost changes of unit area and unit quality,to analyze the reasons for China's grain production cost change in the last decade. It points out that the direct cause of changes in grain production cost is the steady growth of material and services costs,the fastest growth of labor costs and fast growth of land costs. The indirect cause of grain production high cost is the low efficiency in numerous and dispersive farmer production management,obviously insufficient agricultural infrastructure construction,waste phenomenon grain in production process and low contribution rate of agricultural technology.On this basis,it is recommended to reduce China's grain production cost and improve grain production conditions.
文摘This research indicates that with the changes in economic cycles, China's production costs are experiencing "wave-shaped" spiral growth. From 2004 to 2008, China's grain production costs increased rapidly, with the primary driving force the rapid growth of labor, land and material costs. In the middle stage of industrialization, China's grain production costs will experience spiral growth following economic cyclical fluctuations, entering relative stability after a certain period. From 2009 to around 2012, grain production costs will drop, but average production costs may be higher than in the current upward cycle. From 2013 to around 2020, grain production costs will rise again and be much higher than in the current upward cycle.
文摘基于某公司针对Φ12 mm HRB400E热轧带肋钢筋进行的“提锰降钒”生产实践,参考Mn和V的强化机理,统计并分析了两个时期内轧制该规格钢筋的化学成分及力学性能。结果表明:在HRB400E生产实践中,质量分数为0.001%的V对屈服强度的影响近似相等于质量分数为0.020%的Mn对钢材屈服强度的影响。
