The agricultural leading enterprises and farmers have formed a mutual linkage,mutual restraint,and interdependent benefit linkage mechanism.This paper mainly analyzes the existing problems in the benefit linkage betwe...The agricultural leading enterprises and farmers have formed a mutual linkage,mutual restraint,and interdependent benefit linkage mechanism.This paper mainly analyzes the existing problems in the benefit linkage between the agricultural leading enterprises and farmers,and draws on the successful domestic benefit linkage model,and comes up with policy recommendations to provide an effective approach for agricultural leading enterprises to promote development of farmers.展开更多
County-level town is important space carrier of China's urbanization and the emphasis and key of strategic distribution for urbanization. Backwardness of county-level towns limits nearby transfer of surplus labor....County-level town is important space carrier of China's urbanization and the emphasis and key of strategic distribution for urbanization. Backwardness of county-level towns limits nearby transfer of surplus labor. To promote development of county-level towns,on the basis of classifying county-level towns,this paper analyzed motive and resistance factors of evolution of different county-level towns using historical data collection and statistical method,comparative approach,typical case study method,and studied development path for different county-level towns. From analysis,it reached the conclusion that industry exerts the most direct and fundamental influence on development of county-level towns,while the industrial development in county-level towns must base on their actual conditions. The county-level towns are not isolated,and their development should be established within the framework of national policy environment and superior and subordinate town system.展开更多
This paper is to provide an empirical work for agricultural spatial distribution of agriculture. We consider the spatial location pattern in order to offer spatial views on the agricultural economic research and how C...This paper is to provide an empirical work for agricultural spatial distribution of agriculture. We consider the spatial location pattern in order to offer spatial views on the agricultural economic research and how Chinese agricultural economic spatial location pattern is forming, we also tested the agglomeration situation of agriculture and the process is going on in the future. The results indicate that the periphery areas exist significant differential among regions in Hunan province, China. It really presents some kinds of agglomeration pattern of agriculture and characteristic spatial autocorrelation;the biggest rate of contribution to the region agriculture economic gap is productivity per agriculture worker.展开更多
Dielectric optical antennas have emerged as a promising nanophotonic architecture for manipulating the propagation and localization of light.However,the optically induced Mie resonances in an isolated nanoantenna are ...Dielectric optical antennas have emerged as a promising nanophotonic architecture for manipulating the propagation and localization of light.However,the optically induced Mie resonances in an isolated nanoantenna are normally with broad spectra and poor𝑄-factors,limiting their performances in sensing,lasing,and nonlinear optics.Here,we dramatically enhance the𝑄-factors of Mie resonances in silicon(Si)nanoparticles across the optical band by arranging the nanoparticles in a periodic lattice.We select monocrystalline Si with negligible material losses and develop a unique method to fabricate nanoparticle arrays on a quartz substrate.By extinction dispersion measurements and electromagnetic analysis,we can identify three types of collective Mie resonances with𝑄-factors∼500 in the same nanocylinder arrays,including surface lattice resonances,bound states in the continuum,and quasi-guided modes.Our work paves the way for fundamental research in strong light-matter interactions and the design of highly efficient light-emitting metasurfaces.展开更多
基金2019 Special Fund Program of Beijing New Socialist Countryside Construction Research Base(PXM2019-014207-000016)Project of China Agricultural University"Study on Benefit Linkage Mechanism for Agricultural Leading Enterprises Promoting Development of Farmers in the Context of Rural Revitalization Strategy"(201901711110529).
文摘The agricultural leading enterprises and farmers have formed a mutual linkage,mutual restraint,and interdependent benefit linkage mechanism.This paper mainly analyzes the existing problems in the benefit linkage between the agricultural leading enterprises and farmers,and draws on the successful domestic benefit linkage model,and comes up with policy recommendations to provide an effective approach for agricultural leading enterprises to promote development of farmers.
基金Supported by Key Project of National Social Science Foundation(11&ZD009)
文摘County-level town is important space carrier of China's urbanization and the emphasis and key of strategic distribution for urbanization. Backwardness of county-level towns limits nearby transfer of surplus labor. To promote development of county-level towns,on the basis of classifying county-level towns,this paper analyzed motive and resistance factors of evolution of different county-level towns using historical data collection and statistical method,comparative approach,typical case study method,and studied development path for different county-level towns. From analysis,it reached the conclusion that industry exerts the most direct and fundamental influence on development of county-level towns,while the industrial development in county-level towns must base on their actual conditions. The county-level towns are not isolated,and their development should be established within the framework of national policy environment and superior and subordinate town system.
文摘This paper is to provide an empirical work for agricultural spatial distribution of agriculture. We consider the spatial location pattern in order to offer spatial views on the agricultural economic research and how Chinese agricultural economic spatial location pattern is forming, we also tested the agglomeration situation of agriculture and the process is going on in the future. The results indicate that the periphery areas exist significant differential among regions in Hunan province, China. It really presents some kinds of agglomeration pattern of agriculture and characteristic spatial autocorrelation;the biggest rate of contribution to the region agriculture economic gap is productivity per agriculture worker.
基金the National Natural Science Foundation of China(62120106001,62275184,61875143,and 62104165)the Natural Science Foundation of Jiangsu Province(BK20200859,BK20200857,and BK20210713)the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions.JGR and PB also acknowledge financial support from Nederlandse Organisatie voor Wetenschappelijk Onderzoek(NWO)(Vici 680-47-628).
文摘Dielectric optical antennas have emerged as a promising nanophotonic architecture for manipulating the propagation and localization of light.However,the optically induced Mie resonances in an isolated nanoantenna are normally with broad spectra and poor𝑄-factors,limiting their performances in sensing,lasing,and nonlinear optics.Here,we dramatically enhance the𝑄-factors of Mie resonances in silicon(Si)nanoparticles across the optical band by arranging the nanoparticles in a periodic lattice.We select monocrystalline Si with negligible material losses and develop a unique method to fabricate nanoparticle arrays on a quartz substrate.By extinction dispersion measurements and electromagnetic analysis,we can identify three types of collective Mie resonances with𝑄-factors∼500 in the same nanocylinder arrays,including surface lattice resonances,bound states in the continuum,and quasi-guided modes.Our work paves the way for fundamental research in strong light-matter interactions and the design of highly efficient light-emitting metasurfaces.
