In order to optimize the ultrasonic extraction technique for the total flavonoid of leaf yellows plus, the contents of 21 leaf yellows plus total flavonoid from four regions in Heilongjiang Province were comparatively...In order to optimize the ultrasonic extraction technique for the total flavonoid of leaf yellows plus, the contents of 21 leaf yellows plus total flavonoid from four regions in Heilongjiang Province were comparatively analyzed. The ultrasonic extraction technology was optimized by Box-Behnken response surface method, and the total flavonoid content of 21 kinds of Acanthopanax senticosus(Rupr. et Maxim.) Harms from different producing areas were analyzed by cluster analysis. The optimal process conditions were determined as ultrasonic time 30 min, solid-liquid ratio 1 : 12 and ultrasonic power 250 W, and the average yield of the total flavonoid was 1.453 mg·g^ (-1). By optimizing the ultrasonic-assisted extraction method, the total flavonoid content from different producing areas was compared in the experiment, which provided certain data support for the optimization of the extraction process in the future and laid a certain theoretical foundation for the quality analysis of Chinese medicinal materials.展开更多
Aiming at the problem of difficulties in seed filling and seed cleaning caused by the small specific gravity,small size,and irregularity of quinoa seeds,a positive-negative pressure precision seed-metering device for ...Aiming at the problem of difficulties in seed filling and seed cleaning caused by the small specific gravity,small size,and irregularity of quinoa seeds,a positive-negative pressure precision seed-metering device for quinoa seeds with a disturbed seed-filling mechanism was designed.The disturbed seed-filling mechanism can improve the seed-filling performance of the precision seed-metering device and reduce the power consumption required by the forced-draught fan.Positive pressure seed cleaning can solve the problem of pore blockage caused by small and light quinoa seeds and improve work stability.Taking Jili No.3 seed as the research object,simulation analysis of the flow field in the air chamber of the precision seed-metering device was carried out by the Fluent 2021 R1 software.The influence of seed-sucking hole structure parameters(shape and number of seed-sucking holes,inclination angle of seed-sucking holes,and diameter of seed-sucking holes)on the flow field was analyzed by a pressure nephogram and a velocity vectogram.The optimal parameter combination was obtained as follows:a circular-cone-type shape of the seed-sucking hole,a number of 20 seed-sucking holes,a 70°inclination angle of the seed-sucking hole,and a 1 mm diameter of the seed-sucking hole.EDEM 2020 software and orthogonal test were used to optimize the design of the disturbed seed-filling mechanism.The influence of structural parameters of the disturbed seed-filling mechanism(groove radius of the disturbed seed-filling mechanism(GRDSM),arc of the disturbed seed-filling mechanism(ADSM),and position angle of the disturbed seed-filling mechanism(PADSM))on the qualified index(I_(q))of scooping seeds was analyzed.The optimal parameter combination was obtained:1.3 mm GRDSM,140°ADSM,and 25°PADSM.With the help of the JPS-12 test-bench,a response surface test was carried out with the qualified index(I_(q)),the miss index(I_(miss)),and the multiple index(I_(mul))as test indices,and the seed-sucking negative pressure,the seed-metering device rotation speed,and the seed-falling height as test factors.The optimal working parameter combination was obtained:-3.0 kPa seed-sucking negative pressure,15 r/min seed-metering device rotation speed,100 mm seed-falling height.Validation tests were carried out on the optimized seed-metering device,and the results showed that the I_(q) was 82.5%,the I_(miss) was 6.5%,and the I_(mul) was 11%,which met the index requirements in JB/T 10293-2013 Technical conditions of single seed(precision)seeder.The results of this study can provide a reference for the design of machinery for the precision seeding of small seeds such as quinoa.展开更多
In order to solve the problem of poor uniformity of wheat strip sowing,this paper designs a positive-negative pressure wheat wide-seedling-strip-seeding precision seed metering device,which adopts the roller structure...In order to solve the problem of poor uniformity of wheat strip sowing,this paper designs a positive-negative pressure wheat wide-seedling-strip-seeding precision seed metering device,which adopts the roller structure with the principle of combined positive-negative pressure.Through theoretical analysis and relevant data,the structure of the seed metering device and the structure of the positive-negative pressure air chamber were designed.The internal flow field conditions were simulated by Fluent software under different structural parameters.The design of the seed holes was completed by analyzing the pressure cloud diagram and the flow velocity vector diagram,and the optimal combination of parameters was obtained and the influence law of negative pressure on the flow field was obtained.The effect of rotational speed on the flow field was studied by EDEM-Fluent coupling technique.In this paper,a three-factor and three-level response surface test was conducted on a JPS-12 test bench with Liangxin-99 wheat as the research object.The experiment was conducted with the rotational speed of seed metering device,the negative pressure of seed suction and the seeding height as factors,and the qualified index,the reseeding index and the miss-seeding index as evaluation indicators.Through the test,the optimal structure and working parameters of the seed metering device were determined as follows:the diameter of the seed hole was 2 mm,and the number of seed holes per row was 28,negative pressure was−3.5 kPa,rotational speed of seed metering device was 19 r/min,and seeding height was 180 mm.Validation test was carried out on the optimized seed metering device:the qualified index was 80.62%,the reseeding index was 9.22%,and the miss-seeding index was 10.16%,which reached the parameter indicator in JB/T 10293-2013 Technical conditions of single seed(precision)seeder and met the agronomic requirements for wheat wide-seedling-strip-seeding.展开更多
基金Supported by the Breeding Techniques for New Varieties of Acanthopanax senticosus(CZKYF2022-1-B023)。
文摘In order to optimize the ultrasonic extraction technique for the total flavonoid of leaf yellows plus, the contents of 21 leaf yellows plus total flavonoid from four regions in Heilongjiang Province were comparatively analyzed. The ultrasonic extraction technology was optimized by Box-Behnken response surface method, and the total flavonoid content of 21 kinds of Acanthopanax senticosus(Rupr. et Maxim.) Harms from different producing areas were analyzed by cluster analysis. The optimal process conditions were determined as ultrasonic time 30 min, solid-liquid ratio 1 : 12 and ultrasonic power 250 W, and the average yield of the total flavonoid was 1.453 mg·g^ (-1). By optimizing the ultrasonic-assisted extraction method, the total flavonoid content from different producing areas was compared in the experiment, which provided certain data support for the optimization of the extraction process in the future and laid a certain theoretical foundation for the quality analysis of Chinese medicinal materials.
基金financially supported by Key R&D Program of Hebei(Grant No.21326305D,21327215D)Local Science and Technology Development Fund Projects Guided by the Central Government(Grant No.236Z7202G)Zhangjiakou Significant Scientific and Technical Achievement Transformation Project(Grant No.2311012Hc).
文摘Aiming at the problem of difficulties in seed filling and seed cleaning caused by the small specific gravity,small size,and irregularity of quinoa seeds,a positive-negative pressure precision seed-metering device for quinoa seeds with a disturbed seed-filling mechanism was designed.The disturbed seed-filling mechanism can improve the seed-filling performance of the precision seed-metering device and reduce the power consumption required by the forced-draught fan.Positive pressure seed cleaning can solve the problem of pore blockage caused by small and light quinoa seeds and improve work stability.Taking Jili No.3 seed as the research object,simulation analysis of the flow field in the air chamber of the precision seed-metering device was carried out by the Fluent 2021 R1 software.The influence of seed-sucking hole structure parameters(shape and number of seed-sucking holes,inclination angle of seed-sucking holes,and diameter of seed-sucking holes)on the flow field was analyzed by a pressure nephogram and a velocity vectogram.The optimal parameter combination was obtained as follows:a circular-cone-type shape of the seed-sucking hole,a number of 20 seed-sucking holes,a 70°inclination angle of the seed-sucking hole,and a 1 mm diameter of the seed-sucking hole.EDEM 2020 software and orthogonal test were used to optimize the design of the disturbed seed-filling mechanism.The influence of structural parameters of the disturbed seed-filling mechanism(groove radius of the disturbed seed-filling mechanism(GRDSM),arc of the disturbed seed-filling mechanism(ADSM),and position angle of the disturbed seed-filling mechanism(PADSM))on the qualified index(I_(q))of scooping seeds was analyzed.The optimal parameter combination was obtained:1.3 mm GRDSM,140°ADSM,and 25°PADSM.With the help of the JPS-12 test-bench,a response surface test was carried out with the qualified index(I_(q)),the miss index(I_(miss)),and the multiple index(I_(mul))as test indices,and the seed-sucking negative pressure,the seed-metering device rotation speed,and the seed-falling height as test factors.The optimal working parameter combination was obtained:-3.0 kPa seed-sucking negative pressure,15 r/min seed-metering device rotation speed,100 mm seed-falling height.Validation tests were carried out on the optimized seed-metering device,and the results showed that the I_(q) was 82.5%,the I_(miss) was 6.5%,and the I_(mul) was 11%,which met the index requirements in JB/T 10293-2013 Technical conditions of single seed(precision)seeder.The results of this study can provide a reference for the design of machinery for the precision seeding of small seeds such as quinoa.
基金supported by State Key Laboratory of North China Crop Improvement and RegulationKey R&D Projects in Hebei Province(Grant No.21327215D)Funding Projects for the Returned Overseas Chinese Scholars in 2020,China(Grant No.C20200337).
文摘In order to solve the problem of poor uniformity of wheat strip sowing,this paper designs a positive-negative pressure wheat wide-seedling-strip-seeding precision seed metering device,which adopts the roller structure with the principle of combined positive-negative pressure.Through theoretical analysis and relevant data,the structure of the seed metering device and the structure of the positive-negative pressure air chamber were designed.The internal flow field conditions were simulated by Fluent software under different structural parameters.The design of the seed holes was completed by analyzing the pressure cloud diagram and the flow velocity vector diagram,and the optimal combination of parameters was obtained and the influence law of negative pressure on the flow field was obtained.The effect of rotational speed on the flow field was studied by EDEM-Fluent coupling technique.In this paper,a three-factor and three-level response surface test was conducted on a JPS-12 test bench with Liangxin-99 wheat as the research object.The experiment was conducted with the rotational speed of seed metering device,the negative pressure of seed suction and the seeding height as factors,and the qualified index,the reseeding index and the miss-seeding index as evaluation indicators.Through the test,the optimal structure and working parameters of the seed metering device were determined as follows:the diameter of the seed hole was 2 mm,and the number of seed holes per row was 28,negative pressure was−3.5 kPa,rotational speed of seed metering device was 19 r/min,and seeding height was 180 mm.Validation test was carried out on the optimized seed metering device:the qualified index was 80.62%,the reseeding index was 9.22%,and the miss-seeding index was 10.16%,which reached the parameter indicator in JB/T 10293-2013 Technical conditions of single seed(precision)seeder and met the agronomic requirements for wheat wide-seedling-strip-seeding.
