As a study basis in the field of design and research of harvester prototype,bench cutting test is to provide best parameters for the cutter design.In order to obtain the optimal parameters of cutter of the hemp harves...As a study basis in the field of design and research of harvester prototype,bench cutting test is to provide best parameters for the cutter design.In order to obtain the optimal parameters of cutter of the hemp harvester,cutting tests on hemp stalk were conducted to examine the influences of different geometrical parameters(length and edge type)of blade,different cutting speeds and stalk feeding speeds of reciprocating single movable blade and reciprocating double movable blades on the cutting performances(cutting power,cutting quality and synthesis score)by using self-designed test bench.According to features of different test factors,multi-factors orthogonal test was applied to determine the best combination of blade length,blade edge type and number of movable blade.Then with these parameters fixed,the optimal parameters for the factors of cutting speed and stalk feeding speed were obtained by quadratic-regression rotatable orthogonal test.According to the test results,the best combination of hemp stalk cutting was that using cutter with reciprocating double movable blades of long(120 mm)and serrated-edge at cutting speed of 1.1704 m/s and stalk feeding speed of 0.7079 m/s.The tests and analysis results can be applied into subsequent related researches on hemp harvesters.展开更多
为研发低成本、高性能、低压平台容量占比高的钠离子电池负极用碳材料,本文从碳源的选择、材料的制备及其电化学性能的研究出发,采用廉价汉麻杆粉末作为碳源,高浓度碱造孔后进行高温煅烧,成功得到相应的多孔的短程有序、长程无序的负极...为研发低成本、高性能、低压平台容量占比高的钠离子电池负极用碳材料,本文从碳源的选择、材料的制备及其电化学性能的研究出发,采用廉价汉麻杆粉末作为碳源,高浓度碱造孔后进行高温煅烧,成功得到相应的多孔的短程有序、长程无序的负极碳材料。在钠离子电池中,0.5 A g^(-1)的电流密度下达到了230 mAh g^(-1)的比容量,0.1 V以下的平台容量占比达到了53.3%,200次循环的容量保持率达到了97.3%。展开更多
基金We greatly appreciate the careful and precise reviews by the anonymous reviewers and editors.This researchwas financially supported by the National Key R&D Program of China(2016YFD0701405-02)China Agriculture Research System for Bast and Leaf Fiber Crops(CARS-19-E22)the Agricultural Science and Technology Innovation Program of Chinese Academy of AgriculturalSciences(ASTIP,CAAS).
文摘As a study basis in the field of design and research of harvester prototype,bench cutting test is to provide best parameters for the cutter design.In order to obtain the optimal parameters of cutter of the hemp harvester,cutting tests on hemp stalk were conducted to examine the influences of different geometrical parameters(length and edge type)of blade,different cutting speeds and stalk feeding speeds of reciprocating single movable blade and reciprocating double movable blades on the cutting performances(cutting power,cutting quality and synthesis score)by using self-designed test bench.According to features of different test factors,multi-factors orthogonal test was applied to determine the best combination of blade length,blade edge type and number of movable blade.Then with these parameters fixed,the optimal parameters for the factors of cutting speed and stalk feeding speed were obtained by quadratic-regression rotatable orthogonal test.According to the test results,the best combination of hemp stalk cutting was that using cutter with reciprocating double movable blades of long(120 mm)and serrated-edge at cutting speed of 1.1704 m/s and stalk feeding speed of 0.7079 m/s.The tests and analysis results can be applied into subsequent related researches on hemp harvesters.
文摘为研发低成本、高性能、低压平台容量占比高的钠离子电池负极用碳材料,本文从碳源的选择、材料的制备及其电化学性能的研究出发,采用廉价汉麻杆粉末作为碳源,高浓度碱造孔后进行高温煅烧,成功得到相应的多孔的短程有序、长程无序的负极碳材料。在钠离子电池中,0.5 A g^(-1)的电流密度下达到了230 mAh g^(-1)的比容量,0.1 V以下的平台容量占比达到了53.3%,200次循环的容量保持率达到了97.3%。
基金Fund of China Agricultural Research System(CARS-19-E22)The Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(ASTIP,CAAS)
