Since forty years of reform and opening up,China's rural landscape has undergone tremendous changes,and agricultural production manner is obviously improved,while farmers' living level is rose significantly.Ru...Since forty years of reform and opening up,China's rural landscape has undergone tremendous changes,and agricultural production manner is obviously improved,while farmers' living level is rose significantly.Rural land contracting and management right system plays a vital role in promoting rural economic and social development in China.In this paper,farmers under the background of the transfer of rural land contracting and management right are taken as research objects,and the difference of different types of farmers under the willingness of land transfer is analyzed.Finally,corresponding reform assumptions are proposed for transfer willingness of different types of farmers.展开更多
Critter passage can to a large extent ensure the safety of living things crossing the road and reduce the traffic mortality of living things arising from crossing the road. Outdoor drainage pipes can eliminate accumul...Critter passage can to a large extent ensure the safety of living things crossing the road and reduce the traffic mortality of living things arising from crossing the road. Outdoor drainage pipes can eliminate accumulated surface water,alleviate the drainage pressure of urban roads,and reduce the phenomenon of urban stagnant water. At present,there are many studies on the construction methods of drainage pipes,and there are also many studies on critter passage,but there is little research on the organic combination of critter passage and drainage pipes. Taking the drainage pipe as the research object,in accordance with the basic requirements of critter passage,this paper studies the construction methods of ecological drainage pipe with critter passage function,in order to solve the problem of single function of drainage pipe at present. It can provide a reference for related research in the future.展开更多
The ultra-high frequency(UHF)method has been widely used in a gas-insulated system(GIS)for partial-discharge detection,and many achievements have been realised.In addition,many studies based on artificial defects have...The ultra-high frequency(UHF)method has been widely used in a gas-insulated system(GIS)for partial-discharge detection,and many achievements have been realised.In addition,many studies based on artificial defects have been made to confirm its validity.Therefore,the UHF method is generally believed to be sufficiently effective for GIS monitoring.However,in practical application,the authors find that for some micro-crack discharge in GIS insulator,the UHF method has low sensitivity.To fully study the characteristics of the micro-crack discharge in the GIS insulator,an experiment is conducted in this study using an actual post insulator with a micro-crack defect.The current signal based on IEC 60270 standard and the radio-frequency electromagnetic signal is simultaneously measured for thorough analysis.The results show that some submillimetre crack defects may occur in the GIS insulator.Its discharge is mainly presented as glow discharge,and the discharge signal frequency usually cannot reach the UHF band;thus,it cannot be effectively detected by the UHF method.This study provides complementary information to the applicability of the UHF method and inspires further study of the GIS insulator and its monitoring technology.展开更多
基金Supported by On-campus Selection Match Program of the 16th "Challenge Cup" College Students'Extracurricular Academic Science and Technology Works Competition of Jiangxi Normal University
文摘Since forty years of reform and opening up,China's rural landscape has undergone tremendous changes,and agricultural production manner is obviously improved,while farmers' living level is rose significantly.Rural land contracting and management right system plays a vital role in promoting rural economic and social development in China.In this paper,farmers under the background of the transfer of rural land contracting and management right are taken as research objects,and the difference of different types of farmers under the willingness of land transfer is analyzed.Finally,corresponding reform assumptions are proposed for transfer willingness of different types of farmers.
文摘Critter passage can to a large extent ensure the safety of living things crossing the road and reduce the traffic mortality of living things arising from crossing the road. Outdoor drainage pipes can eliminate accumulated surface water,alleviate the drainage pressure of urban roads,and reduce the phenomenon of urban stagnant water. At present,there are many studies on the construction methods of drainage pipes,and there are also many studies on critter passage,but there is little research on the organic combination of critter passage and drainage pipes. Taking the drainage pipe as the research object,in accordance with the basic requirements of critter passage,this paper studies the construction methods of ecological drainage pipe with critter passage function,in order to solve the problem of single function of drainage pipe at present. It can provide a reference for related research in the future.
基金the National Basic Research Program of China(Program,2017YFB0903800)the appendant project(SGTYHT/16-JS-198).
文摘The ultra-high frequency(UHF)method has been widely used in a gas-insulated system(GIS)for partial-discharge detection,and many achievements have been realised.In addition,many studies based on artificial defects have been made to confirm its validity.Therefore,the UHF method is generally believed to be sufficiently effective for GIS monitoring.However,in practical application,the authors find that for some micro-crack discharge in GIS insulator,the UHF method has low sensitivity.To fully study the characteristics of the micro-crack discharge in the GIS insulator,an experiment is conducted in this study using an actual post insulator with a micro-crack defect.The current signal based on IEC 60270 standard and the radio-frequency electromagnetic signal is simultaneously measured for thorough analysis.The results show that some submillimetre crack defects may occur in the GIS insulator.Its discharge is mainly presented as glow discharge,and the discharge signal frequency usually cannot reach the UHF band;thus,it cannot be effectively detected by the UHF method.This study provides complementary information to the applicability of the UHF method and inspires further study of the GIS insulator and its monitoring technology.
