On the basis of document research,we summed up factors of technical demand of commercial paddy farmers to four aspects:individual characteristics of farmers,natural endowment of resources,factors related to risks,and ...On the basis of document research,we summed up factors of technical demand of commercial paddy farmers to four aspects:individual characteristics of farmers,natural endowment of resources,factors related to risks,and information factor.Then,we put forward relevant hypotheses.From survey results of 241 farmer households in 4 southwestern provinces(regions),by the binary logistic regression analysis method,we empirically studied influences of the above four factors on technical demand of commercial paddy farmers.Results show that commercial paddy farmers like simple and high yield cultivation technique best,while individual characteristics of farmers,natural endowment of resources,factors related to risks,and information factors are major factors influencing different agricultural technical demand of commercial paddy farmers.展开更多
The effects of impeller type, stirring power, gas flow rate, and liquid concentration on the gas–liquid mixing in a shear-thinning system with a coaxial mixer were investigated by experiment, and the overall gas hold...The effects of impeller type, stirring power, gas flow rate, and liquid concentration on the gas–liquid mixing in a shear-thinning system with a coaxial mixer were investigated by experiment, and the overall gas holdup, relative power demand, and volumetric mass transfer coefficient under different conditions were compared. The results show that, the increasing stirring power or gas flow rate is beneficial in promoting the overall gas holdup and volumetric mass transfer coefficient, while the increasing system viscosity weakens the mass transfer in a shearing–thinning system. Among the three turbines, the six curved-blade disc turbine(BDT-6) exhibits the best gas pumping capacity; the six 45° pitched-blade disc turbine(PBDT-6) has the highest volumetric mass transfer coefficient at the same unit volume power.展开更多
基金Key National Special GM Project (2011ZX08001001) Industrial Technical System Project for National Modern Agriculture of Rice (4011-08110207) Bill & Melinda Gates Foundation
文摘On the basis of document research,we summed up factors of technical demand of commercial paddy farmers to four aspects:individual characteristics of farmers,natural endowment of resources,factors related to risks,and information factor.Then,we put forward relevant hypotheses.From survey results of 241 farmer households in 4 southwestern provinces(regions),by the binary logistic regression analysis method,we empirically studied influences of the above four factors on technical demand of commercial paddy farmers.Results show that commercial paddy farmers like simple and high yield cultivation technique best,while individual characteristics of farmers,natural endowment of resources,factors related to risks,and information factors are major factors influencing different agricultural technical demand of commercial paddy farmers.
基金Supported by the Zhejiang Provincial Natural Science Foundation of China(LY16B060003)the National Natural Science Foundation of China(21776246)
文摘The effects of impeller type, stirring power, gas flow rate, and liquid concentration on the gas–liquid mixing in a shear-thinning system with a coaxial mixer were investigated by experiment, and the overall gas holdup, relative power demand, and volumetric mass transfer coefficient under different conditions were compared. The results show that, the increasing stirring power or gas flow rate is beneficial in promoting the overall gas holdup and volumetric mass transfer coefficient, while the increasing system viscosity weakens the mass transfer in a shearing–thinning system. Among the three turbines, the six curved-blade disc turbine(BDT-6) exhibits the best gas pumping capacity; the six 45° pitched-blade disc turbine(PBDT-6) has the highest volumetric mass transfer coefficient at the same unit volume power.