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Design and performance evaluation of a variable-rate orchard sprayer based on a laser-scanning sensor

International Journal of Agricultural and Biological Engineering 2019年第6期12卷 51-57页

作者： Jichen Cai xiu wang Yuanyuan Gao Shuo Yang Chunjiang Zhao College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China National Research Center of Intelligent Equipment for Agriculture Beijing 100097China Key Laboratory of Agri-informatics Ministry of AgricultureBeijing 100097China Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture Beijing 100097China

To improve the precision spraying strategy and reduce excessive pesticide application in orchards,an air-assisted sprayer integrated with a laser-scanning system was developed to realize the toward-target variable-rate *** the spray control system,a method of calculating canopy gridding volumes was designed to ensure that the canopy was divided into a uniform grid size,a variable-rate spray model was used in the flow rate decision software to control the spray output according to the canopy gridding volumes and travel speed,and a method of saving and accessing spray data was used to control the spray *** effects of different grid sizes and travel speeds on the spray performance were evaluated by quantifying spray coverage uniformity inside tree *** results showed that spray coverage uniformity declined with increasing grid width from 0.14 to 0.28 m although the mean spray coverage on each target location showed no significant ***,there were no significant variations in mean spray coverage at speeds of 1.0,1.2 and 1.4 m/s for a tested tree of 1.6 m width and at any experimental speeds for a tested tree of 1.3 m width,which indicated that the variable-rate sprayer could provide good spray coverage uniformity under various travel speeds with a canopy size *** with the same sprayer without the variable-rate spray function,the intelligent sprayer prototype realized effective toward-target spraying and avoided overspraying while providing sufficient spray coverage.

关键词： laser-scanning sensor variable-rate spray orchard precision sprayer pesticide application efficiency

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Nozzle test system for droplet deposition characteristics of orchard air-assisted sprayer and its application

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International Journal of Agricultural and Biological Engineering 2014年第2期7卷 122-129,I0003页

作者： Zhai Changyuan Zhao Chunjiang wang xiu Li Wei Li Wei Zhu Ruixiang College of Mechanical and Electronic Engineering Yangling 712100ShaanxiChina Northwest A&F University Yangling 712100ShaanxiChina National Engineering Research Centre for Information Technology in Agriculture Beijing 100097China

In order to obtain nozzle droplet deposition characteristics for sprayer mechanical design and variable spraying control algorithms,a nozzle droplet deposition characteristics test system for air-assisted spraying was *** test system can supply a stable wind site with precisely controlled air speed whose speed control ranges from 2 m/s to 16 m/s with maximum relative error of 4.5%.It can spray out a certain amount of liquid pesticide with adjustable spraying pressure which can be controlled with high precision while the maximum relative error is only 1.33%.The distribution of droplet deposition can be collected and measured by using the acquisition device and a pesticide deposition optical measurement *** experiment of two-dimensional nozzle flow measurement was carried *** results show that nozzle flow distribution is uniform and symmetric with“double-hump”shape in the spray ***-nozzle overlapped droplet deposition ranges from 85%to 116%relative to the *** nozzle droplet deposition experiment was *** experiment results show that in air-assisted spraying,the higher the wind speed,the less droplet deposition is affected by *** the wind speed is higher than 12 m/s and spraying distance is 0.80 m,droplet deposition is concentrated on the originally designated point and hardly affected by *** horizontal spray width becomes smaller with higher wind *** the wind speed is high,it can be considered that nozzle deposition only focuses on the nozzle center,if the position requirement is not very high in orchard spraying.

关键词： air-assisted spraying orchard sprayer flow distribution droplet deposition nozzle test system characteristics test system

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Steroid hormone 20-hydroxyecdysone promotes CTL1-mediated cellular immunity in Helicoverpa armigera

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Insect Science 2021年第5期28卷 1399-1413页

作者： Gui-Jie wang Wen-Wen wang Yu Liu Lian-Qin Chai Guo-xiu wang Xu-Sheng Liu Yu-Feng wang Jia-Lin wang Hubei Key Laboratory of Genetic Regulation and Integrative Biology School of Life SciencesCentral China Normal UniversityWuhan 430079China School of Life Sciences Henan UniversityKaifengHenan475004China

Mermithid nematodes,such as Ovomermis sinensis,are used as biological control agents against many insect pests,including cotton bollworm(Helicoverpa armigera).However,given the host's robust immune system,the infection rate of *** is low,thus restricting its widespread *** understand the host defense mechanisms against mermithid nematodes,we identified and characterized a protein involved in the recognition of ***,the potential ***-binding protein C-type lectin 1(HaCTLla and/or HaCTLIb),which was eluted from the surface of *** after incubation with *** *** is homologous to the previously reported HaCTLla *** was predominantly expressed in hemocytes and was induced by the steroid hormone 20-hydroxyecdysone through ecdysone receptor(HaEcR)or ultraspiracle(HaUSP),or *** assays confirmed the interactions of the HaCTLI proteins with *** but not with Romanomermis wuchangensis,a parasitic nematode of ***,the HaCTL1 proteins were secreted into the hemocoel and promoted hemocyte-mediated encapsulation and phagocytosis.A knockdown of HaEcR and/or HaUSP resulted in compromised encapsulation and ***,HaCTLI appears to modulate cellular immunity in the defense against parasitic nematodes,and the 20-hydroxyecdysone-HaEcR-HaUSP complex is involved in regulating the process.

关键词： C-type lectin encapsulation phagocytosis 20-hydroxyecdysone

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Development of Nb-V-Ti Hot-Rolled High Strength Steel With Fine Ferrite and Precipitation Strengthening

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Journal of Iron and Steel Research International 2009年第4期16卷 72-77页

作者： YI Hai-long DU Lin-xiu wang Guo-dong LIU Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

A hot-rolled steel with high yield strength of 700 MPa, good elongation of about 20% and low ductile-brittle transition temperature （DBTT） lower than -70℃ has been developed in laboratory. The results show that adopting finishing rolling temperature of around 800℃ is rational, and coiling temperature is between 400 and 500℃ The strength of developed 700 MPa hot-rolled high strength steel is derived from the cumulative contribution of fine grain size, dislocation hardening and precipitation hardening. The fine grain strengthening and precipitation hardening are the dominant factors responsible for such high strength, and good elongation and toughness are predominantly due to fine grain ferrite.

关键词： high strength steel precipitation hardening ductile-brittle transition temperature fine grain strengthening

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Hoffa’s fracture in an adolescent treated with an innovative surgical procedure:A case report

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World Journal of Clinical Cases 2022年第4期10卷 1410-1416页

作者： Zu-Xin Jiang Pan wang Shun-Xin Ye Xiao-Ping Xie Chun-xiu wang Yue wang Department of Orthopaedics No.2 People’s Hospital of Yibin CityYibin 644000Sichuan ProvinceChina Department of Oncology No.2 People’s Hospital of Yibin CityYibin 644000Sichuan ProvinceChina Department of Orthopedics Sichuan Provincial People's HospitalChengdu 640000Sichuan ProvinceChina

BACKGROUND Hoffa fracture is rare,especially in adolescents,and has a high rate of complications such as avascular necrosis and osteoarthritis;moreover,there are no definitive guidelines for its *** report could provide a new potential treatment for Hoffa *** SUMMARY A 16-year-old girl presented to the orthopedic emergency department of No.2 People’s Hospital of Yibin City with persistent pain following a right knee injury sustained during a sprint *** knee was swollen and tender,and the range of motion was restricted by the pain.X-ray and computed tomography revealed a Hoffa fracture in the right *** consultation,surgical treatment was performed,and the fracture was fixed with three 3.5-mm cannulated cancellous screws;osteochondral plugs that were harvested from the screw insertion site were re-implanted to cover the screw *** patient’s fracture and osteochondral plug healed 6 mo postoperatively,and she presented a knee range of motion of 0–135 without pain,and was walking without support with a normal *** Here,we describe an innovative surgical procedure for Hoffa fracture that could provide a new possibility for the treatment of similar fractures,and further improve their management.

关键词： Hoffa fracture Osteochondral plug Open reduction Internal fixation Case report

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Comparison Between Radial Basis Function Neural Network and Regression Model for Estimation of Rice Biophysical Parameters Using Remote Sensing

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Pedosphere 2009年第2期19卷 176-188页

作者： YANG Xiao-Hua wang Fu-Min HUANG Jing-Feng wang Jian-Wen wang Ren-Chao SHEN Zhang-Quan wang xiu-Zhen Institute of Agricultural Remote Sensing ＆ Information Application Zhejiang University Hangzhou 310029 China Meteorological and Hydrographic Department of General Staff Headquarters Beijing 100081 China Zhejiang Meteorological Institute Hangzhou 310004 China

The radial basis function （RBF） emerged as a variant of artificial neural network. Generalized regression neural network （GRNN） is one type of RBF, and its principal advantages are that it can quickly learn and rapidly converge to the optimal regression surface with large number of data sets. Hyperspectral reflectance （350 to 2500 nm） data were recorded at two different rice sites in two experiment fields with two cultivars, three nitrogen treatments and one plant density （45 plants m^-2）. Stepwise multivariable regression model （SMR） and RBF were used to compare their predictability for the leaf area index （LAI） and green leaf chlorophyll density （GLCD） of rice based on reflectance （R） and its three different transformations, the first derivative reflectance （D1）, the second derivative reflectance （D2） and the log-transformed reflectance （LOG）. GRNN based on D1 was the best model for the prediction of rice LAI and CLCD. The relationships between different transformations of reflectance and rice parameters could be further improved when RBF was employed. Owing to its strong capacity for nonlinear mapping and good robustness, GRNN could maximize the sensitivity to chlorophyll content using D1. It is concluded that RBF may provide a useful exploratory and predictive tool for the estimation of rice biophysical parameters.

关键词： biophysical parameters radial basis function regression model remote sensing rice

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Application of waste mushroom on land reclamation in the refuse dump of Haizhou Open-pit Mines

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Journal of Coal Science & Engineering(China) 2009年第1期15卷 72-75页

作者： FAN Jun-fu wang xiu-lan College of Resource and Environment Engineering Liaoning Technical University Fuxin 123000 China

In order to rapidly increase the degree of maturation of the soil in land reclamation of the refuse dump of the Haizhou open-pit mines, the application of waste mushroomin the process of soil improvement in the dump was studied. Through the research onplant growth, root development and microbial changes in soil and change of physical andchemical characteristics of the plot, the result shows that waste mushroom can increasethe degree of maturation of the soil and improve soil fertility.

关键词： waste mushroom land reclamation microbial

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Hydrothermal in situ Ligand Synthesis from 1,10-Phenanthroline-5,6-dione and Characterization of 1D Coordination Polymers [Co(bpdc)(H_2O)_3]·H_2O and [Cu(bpy)V_2O_6]

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Chemical Research in Chinese Universities 2007年第3期23卷 250-253页

作者： wang xiu-li BI Yan-feng LIN Hong-yan LIU Guo-cheng Faculty of Chemistry and Chemical Engineering Bohai University Jinzhou 121000 P. R. China

Hydrothermal treatment of MCl2 （ M = Co or Cu ） , NH4 VO3, and 1,10-phenanthroline-5,6-dione （pdon） resulted in the formation of a duplex coordination polymer [ Co （ bpdc ）（ H2O ） 3 ] · H2O （ bpdc = 2,2＇-bipyridine-3,3＇-dicarboxylate） and a chain-like coordination polymer [ Cu （bpy） V2O6 ] （ bpy = 2,2＇-bipyridine ）. X-ray single-crystal structural analysis shows that under hydrothermal conditions and in the presence of different transition metals, the organic reagent pdon was transformed in situ into bpdc and bpy, respectively. Mechanism of the in situ ligand synthesis reaction has been discussed.

关键词： Hydrothermal synthesis In situ Ligand synthesis Coordination polymer Mechanism

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Influence of Holding Time After Deformation on Bainite Transformation in Niobium Microalloyed Steel

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Journal of Iron and Steel Research International 2007年第5期14卷 62-65页

作者： YI Hai-long DU Lin-xiu wang Guo-dong LIU Xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

Using Gleeble-1500 system, the influence of holding time on bainite transformation in deformed niobium microalloyed steel during continuous cooling was analyzed, and the carbides in upper bainite were also systematically researched. The results show that the occurrence of the static recrystallization decreases the amount of bainite with an increase in the holding time and the emergence of retained austenite （RA） with the longer holding time. Two types of carbides were observed in upper bainite with regard to their precipitation sites. They either existed between the bainite ferrite laths or co-existed with RA. The formation mechanism of two kinds of carbides was analyzed by combining TEM micrographs with the model.

关键词： niobium microalloyed steel bainite carbide static recrystallization retained austenite

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Design and test of robotic harvesting system for cherry tomato

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International Journal of Agricultural and Biological Engineering 2018年第1期11卷 96-100页

作者： Qingchun Feng Wei Zou Pengfei Fan Chunfeng Zhang xiu wang Beijing Research Center of Intelligent Equipment for Agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China National Research Center of Intelligent Equipment for Agriculture Beijing 100097China Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture Beijing 100097China

Harvesting of fresh-eating cherry tomato was highly costly on labor and *** order to achieve mechanical harvesting for the fresh-eating tomato,a new harvesting robot was designed,which consisted of a stereo visual unit,an end-effector,manipulator,a fruit collector,and a railed *** robot configuration and workflow design focused on the special cultivating *** key parts were introduced in detail:a railroad vehicle capably moving on both ground and rail was adopted as the robot’s carrier,a visual servo unit was used to identify and locate the mature fruits bunch,and the end-effector to hold and separate the fruit bunch was designed based on the stalk’s mechanical *** field test of the new developed robot was conducted and the results were *** successful harvest rate of the robot was 83%,however,each successful harvest averagely needed 1.4 times attempt,and a single successful harvesting cycle cost 8 s excluding the time cost on moving.

关键词： cherry tomato harvesting robot visual servo configuration design field test

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