In the base of utility and marginal utility,the article put forwardthe concept of utility and marginal utilityof educational outlay and the theory of them,and analyzed the actuality of educational resource deployment ...In the base of utility and marginal utility,the article put forwardthe concept of utility and marginal utilityof educational outlay and the theory of them,and analyzed the actuality of educational resource deployment in ourcountry,gave some advice about howtoi mprove our educational resource deployment of compulsory education.展开更多
Using Compilation of National Cost Benefit Data of Agricultural Products in 1990-2009 and based on the convergence of planting industry marginal labor productivity,this paper studies the integration of agricultural la...Using Compilation of National Cost Benefit Data of Agricultural Products in 1990-2009 and based on the convergence of planting industry marginal labor productivity,this paper studies the integration of agricultural labor market in China. Firstly,it calculates labor output elasticity of each province for wheat,japonica rice and corn. Secondly,it builds indicators reflecting change level of marginal labor productivity. Researches show that in 1990-2000,the difference level of marginal labor productivity expands. From 2000,it starts to fall and becomes more and more stable. However,due to difference of crops and farming custom,the turning point of marginal labor productivity is not consistent with each other. Even so,it is still possible to reach the conclusion that agricultural labor market is gradually integrated from 2000.展开更多
Sweet sorghum is considered a leading non-grain candidate for bioethanol production due to its low input requirement,good tolerance,high biomass potential,and high sugar content.However,insufficient studies have been ...Sweet sorghum is considered a leading non-grain candidate for bioethanol production due to its low input requirement,good tolerance,high biomass potential,and high sugar content.However,insufficient studies have been conducted on the spatial distribution of sweet sorghum-based bioethanol production potential considering the water resources limitation.We presented a multi-factor analysis method not only considering terrain,meteorology,soil,and crop natural growth habits but also considering the local water resource to explore the available marginal land suitable for sweet sorghum cultivation and assess the bioethanol production potential in Northwest China.The results showed that 4.63×10^(7)hm^(2)available marginal land was suitable for sweet sorghum planting.Considering the constraint of local water resources,2.76×10^(6)hm^(2)available marginal land was suitable for sweet sorghum planting,accounting for 4.7%of the total available marginal land.And 1.23×10^(10)L bioethanol could be produced on it.Moreover,for these districts under low water stress levels,9.79×10^(5)hm^(2)available marginal land in Gannan Tibet AP and Longnan of Gansu and Hulun Buir of Inner Mongolia was considered a priority to develop sweet sorghum-based bioethanol,and 5.56×10^(9)L bioethanol could be produced in these districts,which can satisfy the 1.54%biofuel goal for 2050 of China.展开更多
文摘In the base of utility and marginal utility,the article put forwardthe concept of utility and marginal utilityof educational outlay and the theory of them,and analyzed the actuality of educational resource deployment in ourcountry,gave some advice about howtoi mprove our educational resource deployment of compulsory education.
基金Supported by Project of Rural Development Center of Sichuan Province(CR1226)Doctoral Candidate Research Project of Southwestern University of Finance and Economics(JBK1207071)
文摘Using Compilation of National Cost Benefit Data of Agricultural Products in 1990-2009 and based on the convergence of planting industry marginal labor productivity,this paper studies the integration of agricultural labor market in China. Firstly,it calculates labor output elasticity of each province for wheat,japonica rice and corn. Secondly,it builds indicators reflecting change level of marginal labor productivity. Researches show that in 1990-2000,the difference level of marginal labor productivity expands. From 2000,it starts to fall and becomes more and more stable. However,due to difference of crops and farming custom,the turning point of marginal labor productivity is not consistent with each other. Even so,it is still possible to reach the conclusion that agricultural labor market is gradually integrated from 2000.
基金This work was partially supported by the National Natural Science Foundation of China(Grant No.51861125103,51725904,51621061)the Discipline Innovative Engineering Plan(Grant No.111 Program,B14002)。
文摘Sweet sorghum is considered a leading non-grain candidate for bioethanol production due to its low input requirement,good tolerance,high biomass potential,and high sugar content.However,insufficient studies have been conducted on the spatial distribution of sweet sorghum-based bioethanol production potential considering the water resources limitation.We presented a multi-factor analysis method not only considering terrain,meteorology,soil,and crop natural growth habits but also considering the local water resource to explore the available marginal land suitable for sweet sorghum cultivation and assess the bioethanol production potential in Northwest China.The results showed that 4.63×10^(7)hm^(2)available marginal land was suitable for sweet sorghum planting.Considering the constraint of local water resources,2.76×10^(6)hm^(2)available marginal land was suitable for sweet sorghum planting,accounting for 4.7%of the total available marginal land.And 1.23×10^(10)L bioethanol could be produced on it.Moreover,for these districts under low water stress levels,9.79×10^(5)hm^(2)available marginal land in Gannan Tibet AP and Longnan of Gansu and Hulun Buir of Inner Mongolia was considered a priority to develop sweet sorghum-based bioethanol,and 5.56×10^(9)L bioethanol could be produced in these districts,which can satisfy the 1.54%biofuel goal for 2050 of China.
基金欧盟项目:Seeking Synergy between Urban GrowthHorticulture and the Environmentin Asian Metropolises(ICAC-CT2002-10025)+2 种基金国家杰出青年科学基金(70425002)国家自然科学基金(70773058)江苏省研究生培养创新工程项目(CX08-052R)
