|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Current status and future trends of precision agricultural aviation technologies显示文摘Modern technologies and information tools can be used to maximize agricultural aviation productivity allowing for precision application of agrochemical products.This paper reviews and summarizes the state-of-the-art in precision agricultural aviation technology highlighting remote sensing,aerial spraying and ground verification technologies.Further,the authors forecast the future of precision agricultural aviation technology with key development directions in precision agricultural aviation technologies,such as real-time image processing,variable-rate spraying,multi-sensor data fusion and RTK differential positioning,and other supporting technologies for UAV-based aerial spraying.This review is expected to provide references for peers by summarizing the history and achievements,and encourage further development of precision agricultural aviation technologies. | Yubin Lan Chen Shengde Bradley K Fritz | 2017 | International Journal of Agricultural and Biological Engineering2017，10，3： | 35 |
| 2 | Effect of wind field below unmanned helicopter on droplet deposition distribution of aerial spraying显示文摘Wind field is one of the important factors affecting the distribution characteristics of aerial spraying droplet deposition.In order to reveal the impact mechanism of droplet deposition distribution by the wind field below agricultural unmanned helicopter rotor,in this study,the wind field distribution below uniaxial single-rotor electric unmanned helicopter rotor was measured by using a wireless wind speed sensor network measurement system for unmanned helicopter.The effects of wind field in three directions(X,Y,Z)below the rotor on droplet deposition distribution were analyzed with the condition of aerial spraying droplet deposition in rice canopy,and the regression model was established via variance and regression analyses of experiment results.The results showed that,the wind field in Y direction had a significant effect on droplet deposition in effective spray area,the wind field in Z direction had an extremely significant effect on droplet deposition in effective spray area,and the corresponding significance(sig.)values were 0.011 and 0.000.Furthermore,the wind field in Z direction had a significant effect on the penetrability and uniformity of droplet deposition in effective spray area,the corresponding sig.values were 0.025 and 0.011 respectively.The wind speed in Y direction at the edge of effective spray area had a significant effect on droplet drift,the sig.value was 0.021.In addition,the correlation coefficient R of the regression model was 0.869 between droplet deposition in effective spray area and the wind speed in Y and Z directions,and 0.915 between the uniformity of droplet deposition in effective spray area and the maximum wind speed in Z direction.The result revealed the influencing mechanism of the wind field below the rotor of uniaxial single-rotor electric unmanned helicopter on the distribution of aerial spraying droplet deposition.The results can provide guidance for the actual production application of aerial spraying to reduce liquid drift and improve the utilization rate of pesticide. | Chen Shengde Yubin Lan Li Jiyu Zhou Zhiyan Liu Aimin Mao Yuedong | 2017 | International Journal of Agricultural and Biological Engineering2017，10，3： | 25 |
| 3 | Coordinated flight control of miniature fixed-wing UAV swarms: methods and experiments显示文摘In this paper,we present our recent advances in both theoretical methods and field experiments for the coordinated control of miniature fixed-wing unmanned aerial vehicle(UAV)swarms.We propose a multi-layered group-based architecture,which is modularized,mission-oriented,and can implement large-scale swarms.To accomplish the desired coordinated formation flight,we present a novel distributed coordinated-control scheme comprising a consensus-based circling rendezvous,a coordinated path-following control for the leader UAVs,and a leader-follower coordinated control for the follower UAVs.The current framework embeds a formation pattern reconfiguration technique.Moreover,we discuss two security solutions(inter-UAV collision avoidance and obstacle avoidance)in the swarm flight problem.The effectiveness of the proposed coordinated control methods was demonstrated in field experiments by deploying up to 21 fixed-wing UAVs. | Xiangke WANG Lincheng SHEN Zhihong LIU Shulong ZHAO Yirui CONG Zhongkui LI Shengde JIA Hao CHEN Yangguan YU Yuan CHANG Yajing WANG | 2019 | Science China(Information Sciences)2019，62，11： | 21 |
| 4 | Effects of droplet size and spray volume parameters on droplet deposition of wheat herbicide application by using UAV显示文摘With the characteristic of flexible and precise,unmanned aerial vehicles(UAVs)for low volume applications are increasing substantially and quickly around the globe.However,little attention has been paid to the study of wheat herbicides with UAV,especially the research on the spray volume and droplet size of the herbicide sprayed by UAVs.The objectives of this study were to compare the droplet deposition from a typical commercial UAV under four different spray volumes of 7.5 L/hm2,15.0 L/hm2,22.5 L/hm2,and 30.0 L/hm2 and three different volume median diameter(VMD)of 150μm,200μm,and 300μm during winter wheat weeding period.DepositScan software was used to analyze droplet deposition parameters including the percentage of spray coverage and the number of droplets in various sampling positions.The test results showed that the droplet deposition waseffected by each factor andtheirinteractions.When the spray volume was 7.5 L/hm2,the effect of VMD on the percentage of spray coverage was not significant.However,these variation rules were changed to smaller droplets with greater coverage when the spray volume higher than 15.0 L/hm2.In all treatments,the number of droplets increased with decreasing VMD or increasing spray volume.The maximum percentage of spray coverage and the number of droplets that were achieved under the VMD of 150μm and the spray volume of 30.0 L/hm2 were 12.8%and 40.0 droplets/cm2,respectively.The variation coefficients of the percentage of spray coverage and the number of droplets were 29.0%-73.3%and 20.2%-54.1%,respectively.The most uniform deposition was achieved under the spray volume of 15.0 L/hm2and the VMD of 150μm.The results revealed the effect of droplet size and spray volume parameters on droplet deposition,which was useful for guiding farmers on how to use UAVs for weeding in winter wheat fields. | Changfeng Shan Guobin Wang Haihong Wang Yingjie Xie Huizheng Wang Shilong Wang Shengde Chen Yubin Lan | 2021 | International Journal of Agricultural and Biological Engineering2021，14，1： | 3 |
| 5 | Research advances of the drift reducing technologies in application of agricultural aviation spraying显示文摘With the gradual deterioration of the ecological environment and the increase in requirements for the quality of modern life,the use of pesticides is bound to develop towards higher pesticide utilization and less environmental pollution,and the low-volume spraying for agricultural aviation operation combined with the Drift Reducing Technologies(DRTs)may be a useful way to achieve this goal.Based on an analysis of the spray drift mechanism and the primary factors influencing aerial spraying,previous research on DRTs in aerial spraying were reviewed and summarized,and it was found that DRTs in aerial spraying can effectively reduce the environmental pollution caused by pesticide drift by reducing the spraying amount of pesticides and improving the control effect of pesticides,included aerial electrostatic spray technology,aerial spray adjuvant,aerial air-assisted spray technology,drift reducing nozzles and aerial variable-rate spray technology.And according to the analysis of the current research status,some suggestions and countermeasures to reduce droplet drift of agricultural aviation spraying were put forward from the aspects of strengthening the research on DRTs for plant protection Unmanned Aerial Vehicle(UAV)and adopting reasonable DRTs methods.It is hoped that provide reference and guidance for the enterprises’product improvement and users’practical operation,and play the advantages of precision agricultural aviation spraying fully. | Shengde Chen Yubin Lan Zhiyan Zhou Xiaoling Deng Juan Wang | 2021 | International Journal of Agricultural and Biological Engineering2021，14，5： | 2 |
| 6 | Distribution law of rice pollen in the wind field of small UAV显示文摘The wind field produced by the rotor-wing UAV has a significant impact on the distribution of rice pollen,which directly influences hybrid rice breeding.This research aimed to explore the distribution law of rice pollen in the wind field of small UAV.Aviation Beidou Positioning System UB351 positions all sampling nodes for precise corresponding coordinates and spacing information,and draws UVA’s flying trajectories,thus providing accurate data for tests.Wireless sensor network measurement system was used to study the three-direction wind field produced by the rotor-wing UAV under various experimental factors and acquires wind field width and wind speed,and the data were compared with the area ratio and width of pollen distribution.Test of univariate normality was conducted through Shapiro-Wilk test and Kolmogorov-Smimov test.In order to figure out the appropriate flight speed for UAV’s pollination under pollen distribution law,it is also necessary to perform analysis of variances on regression model.The comparison of wind speed in longitudinal(X)and lateral(Y)direction show that as the major force of the horizontal wind field produced by the rotor-wing UAV,the wind from Y-direction forms the widest wind field.Moreover,flight speed mainly influences wind field width.To be specific,the width of horizontal wind field decreases as flight speed increases.Meanwhile,UAV flight speed also exerts significant impact on vertical wind field.Both the pollen distribution width of more than 5 pollen grains and the area ratio reached the maximum when the UAV flight was at 4.53 m/s,which was the most favorable speed to pollination.In addition,pollen quantity is closely associated with both horizontal and vertical wind field.With comparison of the pollen quantity of sampling nodes,it was found that the wind field produced by the rotor-wing UAV exerted asymmetrical impact on pollen distribution.Q-Q plot of SPSS verifies that pollen distribution is against normal distribution.The establishment of a multiple linear regression model of pollen distribution and wind speed in three directions indicates that pollen distribution quantity only shares positive linear relation with the wind field in X-direction.These findings provide a theoretical guidance for rice pollination by using agricultural UAVs. | Li Jiyu Yubin Lan Wang Jianwei Chen Shengde Huang Cong Liu Qi Liang Qiuping | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 2 |
| 7 | RuO_(2) clusters derived from bulk SrRuO_(3):Robust catalyst for oxygen evolution reaction in acid显示文摘Developing highly efficient oxygen evolution reaction(OER)catalyst for the acidic corrosive operating conditions is a challenging task.Herein,we report the synthesis of uniform RuO_(2)clusters with~2 nm in size via electrochemical leaching of Sr from SrRuO_(3) ceramic in acid.The RuO_(2)clusters exhibit ultrahigh OER activity with overpotential of~160 mV at 10 mA·cm_(geo)^(−2) in 1.0 M HClO4 solution for 30-h testing.The extended X-ray absorption fine structure measurement reveals enlarged Jahn-Teller distortion of Ru-O octahedra in the RuO_(2)clusters compared to its bulk counterpart.Density function theory calculations show that the enhanced Jahn-Teller distortion can improve the intrinsic OER activity of RuO_(2). | Muwei Ji Xin Yang Shengding Chang Wenxing Chen Jin Wang Dongsheng He Yao Hu Qian Deng You Sun Bo Li Jingyu Xi Tomoaki Yamada Jiatao Zhang Hai Xiao Caizhen Zhu Jia Li Yadong Li | 2022 | Nano Research2022，15，3： | 2 |
| 8 | Preparation and characterization of a novel bipolar membrane by plasma- induced polymerization显示文摘 | Li Shengde Wang Chengchien Chen Chuhyung | 2008 | J Membr Sci2008，318，12： | 1 |
| 9 | Droplets deposition and harvest-aid efficacy for UAV application in arid cotton areas in Xinjiang,China显示文摘With the development of Unmanned Aerial Vehicle(UAV)sprayers,the application of low-volume spraying of harvest-aid and other agrochemicals to cotton using UAVs is becoming a new agronomic trend worldwide.The effect of spray volume and canopy density for UAV spraying is significant but was rarely studied.In this study,five representative spray volumes were explored to examine the effect of spray volume on deposition and harvest-aid efficacy for cotton using a UAV sprayer.To explore the effect of canopy density,similar tests were carried out in a field located nearby with a lower leaf area index(LAI).A conventional trailer boom sprayer was selected for comparison.Different spray volumes had a significant effect on defoliation,but had no significant effect on boll opening and fiber quality.A higher defoliation rate was achieved in the lower LAI field.The total rate of defoliation using the UAV was inferior to the boom sprayer in the high LAI field for lower deposition and defoliation rate in the lower canopy.Considering the deposition,defoliation rate,and working efficiency,a spray volume of 15.0 L/hm^(2) with an average droplet size of 150μm is recommended for UAV application. | Guobin Wang Jiahui Wang Pengchao Chen Xiaoqiang Han Shengde Chen Yubin Lan | 2022 | International Journal of Agricultural and Biological Engineering2022，15，5： | 0 |
| 10 | Ultralow Interfacial Thermal Resistance of Graphene Thermal Interface Materials with Surface Metal Liquefaction显示文摘Developing advanced thermal interface materials(TIMs)to bridge heat-generating chip and heat sink for constructing an efficient heat transfer interface is the key technology to solve the thermal management issue of high-power semiconductor devices.Based on the ultra-high basal-plane thermal conductivity,graphene is an ideal candidate for preparing high-performance TIMs,preferably to form a vertically aligned structure so that the basal-plane of graphene is consistent with the heat transfer direction of TIM.However,the actual interfacial heat transfer efficiency of currently reported vertically aligned graphene TIMs is far from satisfactory.In addition to the fact that the thermal conductivity of the vertically aligned TIMs can be further improved,another critical factor is the limited actual contact area leading to relatively high contact thermal resistance(20-30 K mm^(2) W^(−1))of the“solid-solid”mating interface formed by the vertical graphene and the rough chip/heat sink.To solve this common problem faced by vertically aligned graphene,in this work,we combined mechanical orientation and surface modification strategy to construct a three-tiered TIM composed of mainly vertically aligned graphene in the middle and micrometer-thick liquid metal as a cap layer on upper and lower surfaces.Based on rational graphene orientation regulation in the middle tier,the resultant graphene-based TIM exhibited an ultra-high thermal conductivity of 176 W m^(−1) K^(−1).Additionally,we demonstrated that the liquid metal cap layer in contact with the chip/heat sink forms a“liquid-solid”mating interface,significantly increasing the effective heat transfer area and giving a low contact thermal con-ductivity of 4-6 K mm^(2) W^(−1) under packaging conditions.This finding provides valuable guidance for the design of high-performance TIMs based on two-dimensional materials and improves the possibility of their practical application in electronic thermal management. | Wen Dai Xing-Jie Ren Qingwei Yan Shengding Wang Mingyang Yang Le Lv Junfeng Ying Lu Chen Peidi Tao Liwen Sun Chen Xue Jinhong Yu Chengyi Song Kazuhito Nishimura Nan Jiang Cheng-Te Lin | 2023 | Nano-Micro Letters2023，15，1： | 0 |
| 11 | 细胞核内病毒RNA受体SAFA连接天然免疫和染色质重塑显示文摘文章简介天然免疫免疫从上世纪发现模式识别受体在现在一直学界研究的热点,而细胞核内的天然免疫识别和调节机制还不为人所知。本研究揭示了SAFA作为一个新型的细胞核内病毒双链RNA(dsRNA)监测器,连接染色质重塑和抗病毒天然免疫反应。该研究显示多种病毒感染宿主细胞后,在细胞核中产生dsRNA,被SAFA监测结合,引起SAFA发生寡聚化。 | Lili Cao Shengde Liu Yunfei Li Guang Yang Yujie Luo Siji Li Hongqiang Du Yingchi Zhao Dandan Wang Jingxuan Chen Zeming Zhang Mo Li Songying Ouyang Xiang Gao Yujie Sun Zekun Wang Long Yang Rongtuan Lin Penghua Wang 游富平 | 2020 | 科学新闻2020，，2： | 0 |
| 12 | Detection of the foreign object positions in agricultural soils using Mask-RCNN显示文摘Objects in agricultural soils will seriously affect the farming operations of agricultural machinery.At present,it still relies on human experience to judge abnormal Gounrd-penetrting Radar(GPR)signals.It is difficult for traditional image processing technology to form a general positioning method for the randomness and diversity characteristics of GPR signals in soil.Although many scholars had researched a variety of image-processing techniques,most methods lack robustness.In this study,the deep learning algorithm Mask Region-based Convolutional Neural Network(Mask-RCNN)and a geometric model were combined to improve the GPR positioning accuracy.First,a soil stratification experiment was set to classify the physical parameters of the soil and study the attenuation law of electromagnetic waves.Secondly,a SOIL-GPR geometric model was proposed,which can be combined with Mask-RCNN's MASK geometric size to predict object sizes.The results proved the effectiveness and accuracy of the model for position detection and evaluation of objects in soils;then,the improved Mask RCNN method was used to compare the feature extraction accuracy of U-Net and Fully Convolutional Networks(FCN);Finally,the operating speed of agricultural machinery was simulated and designed the A-B survey line experiment.The detection accuracy was evaluated by several indicators,such as the survey line direction,soil depth false alarm rate,Mean Average Precision(mAP),and Intersection over Union(IoU).The results showed that pixel-level segmentation and positioning based on Mask RCNN can improve the accuracy of the position detection of objects in agricultural soil effectively,and the average error of depth prediction is 2.87 cm.The results showed that the detection technology proposed in this study integrates the advantage of soil environmental parameters,geometric models,and artificial intelligence algorithms to provide a high-precision and technical solution for the GPR non-destructive detection of soils. | Yuanhong Li Chaofeng Wang Congyue Wang Xiaoling Deng Zuoxi Zhao Shengde Chen Yubin Lan | 2023 | International Journal of Agricultural and Biological Engineering2023，16，1： | 0 |
| 13 | Downwash airflow field distribution characteristics and their effect on the spray field distribution of the DJI T30 six-rotor plant protection UAV显示文摘Spray characteristics are the fundamental factors that affect droplet transportation downward,deposition,and drift.The downwash airflow field of the Unmanned Aviation Vehicle(UAV)primarily influences droplet deposition and drift by changing the spray characteristics.This study focused mainly on the effect of the downwash airflow field of the UAV and nozzle position on the droplet spatial distribution and velocity distribution,which are two factors of spray characteristics.To study the abovementioned characteristics,computational fluid dynamics based on the lattice Boltzmann method(LBM)was used to simulate the downwash airflow field of the DJI T30 six-rotor plant protection UAV at different rotor rotational speeds(1000-1800 r/min).A particle image velocimetry system(PIV)was utilized to record the spray field with the downwash airflow field at different rotational speeds of rotors(0-1800 r/min)or different nozzle positions(0,0.20 m,0.35 m,and 0.50 m from the motor).The simulation and experimental results showed that the rotor downwash airflow field exhibited the‘dispersion-shrinkage-redispersion’development rule.In the initial dispersion stage of rotor airflow,there were obvious high-vorticity and low-vorticity regions in the rotor downwash airflow field.Moreover,the low-vorticity region was primarily concentrated below the motor,and the high-vorticity region was mainly focused in the middle area of the rotors.Additionally,the Y-direction airflow velocity fluctuated at 0.4-1.2 m under the rotor.When the rotor airflow developed to 3.2 m below the rotor,the Y-direction airflow velocity showed a slight decrease.Above 3.2 m from the rotor,the Y-direction airflow velocity started to drastically decrease.Therefore,it is recommended that the DJI T30 plant protection UAV should not exceed 3.2 m in flight height during field spraying operations.The rotor downwash airflow field caused the nozzle atomization angle,droplet concentration,and spray field width to decrease while increasing the vortex scale in the spray field when the rotor system was activated.Moreover,the increase in rotor rotational speed promoted the abovementioned trend.When the nozzle was installed in various radial locations below the rotor,the droplet spatial distribution and velocity distribution were completely different.When the nozzle was installed directly below the motor,the droplet spatial distribution and velocity distribution were relatively symmetrical.When the nozzle was installed at 0.20 m and 0.35 m from the motor,the droplets clearly moved toward the right under the induction of stronger rotor vortices.This resulted in a higher droplet concentration in the right-half spray field.However,the droplet moved toward the left when the nozzle was installed in the rotor tip.For four nozzle positions,when the nozzle was installed at 0 or 0.20 m from the motor,the droplet average velocity was much higher.However,the droplet average velocity was slower when the nozzle was installed in the other two positions.Therefore,it is recommended that the nozzle is installed at 0 or 0.20 m from the motor.The research results could increase the understanding of the downwash airflow field distribution characteristics of the UAV and its influence on the droplet spatial distribution and velocity distribution characteristics.Meanwhile,the research results could provide some theoretical guidance for the choice of nozzle position below the rotor. | Haiyan Zhang Sheng Wen Chunling Chen Qi Liu Tongyu Xu Shengde Chen Yubin Lan | 2023 | International Journal of Agricultural and Biological Engineering2023，16，2： | 0 |
| 14 | X-box binding protein 1 caused an imbalance in pyroptosis and mitophagy in immature rats with di-(2-ethylhexyl)phthalate-induced testis toxicity显示文摘As a widely used plasticizer,di-(2-ethylhexyl)phthalate(DEHP)is known to induce significant testicular injury.However,the potential mechanism and effects of pubertal exposure to DEHP on testis development remain unclear.In vivo,postnatal day(PND)21 male rats were gavaged with 0,250,and 500 mg/kg DEHP for ten days.Damage to the seminiferous epithelium and disturbed spermatogenesis were observed after DEHP exposure.Meanwhile,oxidative stress-induced injury and pyroptosis were activated.Both endoplasmic reticulum(ER)stress and mitophagy were involved in this process.Monoethylhexyl phthalate(MEHP)was used as the biometabolite of DEHP in vitro.The GC-1 and GC-2 cell lines were exposed to 0,100μM,200μM,and 400μM MEHP for 24 h.Reactive oxygen species(ROS)generation,oxidative stress damage,ER stress,mitophagy,and pyroptosis were significantly increased after MEHP exposure.The ultrastructure of the ER and mitochondria was destroyed.X-box binding protein 1(XBP1)was observed to be activated and translocated into the nucleus.ROS generation was inhibited by acetylcysteine.The levels of antioxidative stress,ER stress,mitophagy,and pyroptosis were decreased as well.After the administration of the ER stress inhibitor 4-phenyl-butyric acid,both mitophagy and pyroptosis were inhibited.Toyocamycin-induced XBP1 down-regulation decreased the levels of mitophagy and pyroptosis.The equilibrium between pyroptosis and mitophagy was disturbed by XBP1 accumulation.In summary,our findings confirmed that DEHP induced a ROS-mediated imbalance in pyroptosis and mitophagy in immature rat testes via XBP1.Moreover,XBP1 might be the key target in DEHP-related testis dysfunction. | Yifan Hong Xiazhu Zhou Qi Li Jing Chen Yuexin Wei Chunlan Long Lianju Shen Xiangqin Zheng Dinggang Li Xia Wang Chenjun Yu Shengde Wu Guanghui Wei | 2024 | Genes & Diseases2024，11，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员