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| 1 | Winter Wheat Drought Monitoring and Comprehensive Risk Assessment: Case Study of Xingtai Administrative District in North China显示文摘 | Yanrui Shang Qinghua Hu Gongying Liu Hanwen Zhang | 2017 | Journal of Environmental Science and Engineering(A)2017，6，3： | 1 |
| 2 | Development of the peanut precision fertilization control system based on threshold velocity algorithm显示文摘In view of the fact that the current ground wheel velocimetry of the peanut precision fertilizer control system cannot solve the phenomenon of ground wheel slippage,and signal interference and delay loss cannot be excluded by BeiDou positioning velocimetry,a set of peanut precision fertilizer control system was designed based on the threshold speed algorithm.The system used STM32F103ZET6 microcontroller as the main controller,and touch screen for setting the operating parameters such as operating width,fertilizer type,and fertilizer application amount.The threshold speed algorithm combined with BeiDou and ground wheel velocimetry was adopted to obtain the forward speed of the tractor and adjust the speed of the DC drive motor of the fertilizer applicator in real time to achieve precise fertilizer application.First,through the threshold speed algorithm test,the optimal value of the length N of the ground wheel speed measurement queue was determined as 3,and the threshold of the speed variation coefficient was set to 4.6%.Then,the response performance of the threshold speed algorithm was verified by comparative test with different fertilization amounts(40 kg/hm^(2),50 kg/hm^(2),60 kg/hm^(2),70 kg/hm^(2))under two speed acquisition methods of ground wheel speed measurement and threshold speed algorithm(combination of Beidou single-point speed and ground wheel speed measurement)in different operation speeds(3 km/h,4 km/h,5 km/h).The response performance test results showed that the average value of the velocimetry delay distance of the BeiDou single-point positioning velocimetry method was 0.58 m,while the average value of that with the threshold velocity algorithm was 0.27 m,which decreased by 0.31 m and indicated more accurate with the threshold velocity algorithm.The field comparison test for fertilizer application performance turned out an over 96.08%accuracy rate of fertilizer discharge by applied with the threshold speed algorithm,which effectively avoided the inaccurate fertilizer application caused by wheel slippage and raised the accuracy of fertilizer discharge by at least 1.2%compared with that of using the ground wheel velocimetry alone.The results showed that the threshold speed algorithm can meet the requirements of precise fertilizer application. | Yuqi Fan Yan Yu Shuqi Shang Tianying Gu Yanrui Hu Linsong Diao Ruchao Ge Xing Zhang | 2022 | International Journal of Agricultural and Biological Engineering2022，15，5： | 0 |
| 3 | Design of motor-driven precision seed-metering device with improved fuzzy PID controller for small peanut planters显示文摘Traditional passive ground wheel drive of peanut planters has displayed poor high-speed seeding performance and the slippage caused in case of sticky and wet soil.Given this,an integrated electric-driven precision seed metering device and controller were designed,which features the application of improved fuzzy PID algorithm.Based on a small peanut planter with one ridge width and duplicate rows,the servo motor drive is used to replace the traditional passive ground wheel.In addition,the satellite speed measurement is employed to complete the electric driving and controlling modification of the seed meter and precise seeding control.A working process mathematical model for the peanut metering device was established to conduct motor speed and field tests which aim at comparing performances between the conventional and the improved fuzzy PID controls.The motor speed trial shows that the average error of the actual speed of the improved fuzzy PID motor was±1 rad/min,and the coefficient of variation was less than 1%.Against the conventional one,it can better suppress overshoot and improve the response speed.The stable output speed can still be obtained even in case of step changes.Field tests show that when working at medium and low speeds,the qualified rate of plant spacing was greater than 98%,and the rate of missed sowing is<2%;while working at high speed,the qualified rate was greater than 94%,and the rate of missed sowing was less than 4%.The average plant spacing qualification rate of the seed device increased by 6.72%;compared with other electric-driven peanut seed meters,the plant spacing qualification rate increased by 4%during high-speed sowing.In summary,this study has provided an effective technical reference for high-speed precision planting of peanuts. | Yan Yu Yanrui Hu Shuqi Shang Linsong Diao Ruchao Ge Xing Zhang | 2023 | International Journal of Agricultural and Biological Engineering2023，16，1： | 0 |
| 4 | Effect of disrupted episodic memory on food consumption:no impact of neuronal loss of endophilin A1 on food intake and energy balance显示文摘Food intake is generally assumed to reflect a regulatory tension between homeostatic and hedonic drivers.Information from individuals with memory dysfunction suggests that episodic memory may also play a significant role.We reasoned that if memory influences food intake,then disrupting a genetic factor that is important in episodic memory formation should affect food intake and energy balance.We performed spatial learning tests on neuronal specific endophilin A1(EENA1)KO mice using the four-arm baited version of the radial arms maze(RAM).Energy regulation has also been evaluated.As anticipated neuronal EENA1 KO mice had impaired spatial memory.However,loss of endophilin A1 did not result in greater food intake,or altered energy absorption efficiency,relative to wild-type(WT)mice,when fed either low or high fat diets.Moreover,loss of EENA1 did not significantly affect other features of energy balance—physical activity and energy expenditure.No statistically significant changes were observed in the expression of hypothalamic neuropeptides related to food intake regulation,or circulating levels of leptin.We conclude that food intake and energy balance are largely governed by homeostatic and hedonic processes,and when these processes are intact memory probably plays a relatively minor role in food intake regulation. | Jacques Togo Yanrui Yang Sumei Hu Jia-Jia Liu John R.Speakman | 2022 | Journal of Genetics and Genomics2022，49，4： | 0 |
| 5 | 纳米空间分辨率和毫秒时间尺度下观察细胞内细胞器和细胞骨架的互作显示文摘文章简介真核细胞内的各种细胞器之间以及和细胞器与细胞骨架之间时刻进行着高度动态却又有序的相互作用,这些相互作用可协调完成细胞内的复杂功能。观察这些相互作用需要对细胞的内环境进行非侵入式且长时间的高时空分辨率成像。 | 郭玉婷 李迪 Siwei Zhang Yanrui Yang Jia-Jia Liu Xinyu Wang Chong Liu Daniel E.Milkie Regan P.Moore U.Serdar Tulu Daniel P.Kiehart Junjie Hu Jennifer Lippincott-Schwartz Eric Betzig 李栋 | 2019 | 科学新闻2019，0，2： | 0 |
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