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| 1 | Design and experiment of variable rate orchard sprayer based on laser scanning sensor显示文摘During different growth periods,canopy size and density in orchards are variable,which need application conditions(flow rate and air flow)to be adjusted to match the canopy’s characteristics.In order to improve orchard sprayer’s automatic operating performance,an automatic variable-rate orchard sprayer(VARS)fixed with 40 electromagnetic valves and 8 brushless fans was developed based on the canopy’s spatial dimensions.Each solenoid valve and brushless motor can be individually adjusted in real-time through pulse width modulation(PWM)signals emitted by a control system to adjust each nozzle’s spout and fan rotation speed.A high-precision laser scanning sensor(light detecting and ranging,LIDAR)was adopted as the detector to measure the canopy volume using the variable rate algorithm principle.Field experiments were conducted in an apple orchard,and conventional air blast sprayer(CABS)and directed air-jet sprayer(DAJS)were tested as a comparison.Results showed that on average,46%less spraying solution was applied compared to conventional applications,while penetration rate was similar to DAJS.Normalized deposition in the canopy with variable application was higher than that of conventional applications,indicating that electronic sprayers are more efficient than conventional sprayers.It was also observed that VARS could significantly reduce off-target loss.The field experiment showed that the newly developed variable-rate sprayer can greatly reduce pesticide use and protect the environment for the orchard fruit production,and also provide a reference for design and performance optimization for plant protection machinery. | Longlong Li Xiongkui He Jianli Song Yajia Liu Aijun Zeng Liu Yang Chaohui Liu Zhixiong Liu | 2018 | International Journal of Agricultural and Biological Engineering2018，11，1： | 8 |
| 2 | Influence of Zn Content on Microstructures,Mechanical Properties and Stress Corrosion Behavior of AA5083 Aluminum Alloy显示文摘To enhance the stress corrosion cracking(SCC)resistance,Zn was utilized as an alloy element to add in the AA5083 aluminum alloys.The effects of Zn content on the microstructures,mechanical properties and SCC resistance were systematically evaluated.The results demonstrate that in the studied range adding Zn can significantly improve the SCC resistance of the AA5083 alloys.This is related to the relatively low amount of continuous β(Al3Mg2)phase along grain boundary and the formation of Zn-containing phase such as Al5Mg11Zn4 phase.Based on the results,the optimal Zn content with respect to SCC resistance is approximately 0.50 wt.%.Further increasing Zn content results in coarse precipitates discontinuously distributed along grain boundaries. | Zhixiong Zhu Xingxu Jiang Gang Wei Xiaogang Fang Zhihong Zhong Kuijing Song Jian Han Zhengyi Jiang | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，10： | 1 |
| 3 | Waterlogging risk assessment for winter wheat using multi-source data in the middle and lower reaches of Yangtze River显示文摘Waterlogging is a serious agro-meteorological disaster caused by excessive soil water,which usually causes tremendous crop yield losses.The region of middle and lower reaches of Yangtze River in China is an important production base of winter wheat,and is an area prone to waterlogging.The risk assessment of winter wheat waterlogging can provide more thorough understanding about the risk-prone environment related with food safety in this region.This study combined a variety of environmental and agricultural factors and assessed the waterlogging risk of winter wheat from the aspects of sensitivity of hazard formative environments,hazard risk,and vulnerability of hazard-affected body using multi-source data.Furthermore,it constructed a compound waterlogging risk assessment model to classify the study area into high,relatively high,moderate,and low risky areas,respectively.The results showed that the proposed model could more comprehensively reflect the occurrence mechanism of winter wheat waterlogging by synchronizing geographical,agricultural,and meteorological factors.The waterlogging regionalization based on the model could reasonably represent the spatial distribution and differentiate regional characteristics of winter wheat waterlogging in the study area. | Yuanyuan Chen Jingfeng Huang Xiaodong Song Hongyan Wu Shaoxue Sheng Zhixiong Liu Xiuzhen Wang | 2018 | International Journal of Agricultural and Biological Engineering2018，11，5： | 0 |
| 4 | Bridge Crack Segmentation Method Based on Parallel Attention Mechanism and Multi-Scale Features Fusion显示文摘Regular inspection of bridge cracks is crucial to bridge maintenance and repair.The traditional manual crack detection methods are timeconsuming,dangerous and subjective.At the same time,for the existing mainstream vision-based automatic crack detection algorithms,it is challenging to detect fine cracks and balance the detection accuracy and speed.Therefore,this paper proposes a new bridge crack segmentationmethod based on parallel attention mechanism and multi-scale features fusion on top of the DeeplabV3+network framework.First,the improved lightweight MobileNetv2 network and dilated separable convolution are integrated into the original DeeplabV3+network to improve the original backbone network Xception and atrous spatial pyramid pooling(ASPP)module,respectively,dramatically reducing the number of parameters in the network and accelerates the training and prediction speed of the model.Moreover,we introduce the parallel attention mechanism into the encoding and decoding stages.The attention to the crack regions can be enhanced from the aspects of both channel and spatial parts and significantly suppress the interference of various noises.Finally,we further improve the detection performance of the model for fine cracks by introducing a multi-scale features fusion module.Our research results are validated on the self-made dataset.The experiments show that our method is more accurate than other methods.Its intersection of union(IoU)and F1-score(F1)are increased to 77.96%and 87.57%,respectively.In addition,the number of parameters is only 4.10M,which is much smaller than the original network;also,the frames per second(FPS)is increased to 15 frames/s.The results prove that the proposed method fits well the requirements of rapid and accurate detection of bridge cracks and is superior to other methods. | Jianwei Yuan Xinli Song Huaijian Pu Zhixiong Zheng Ziyang Niu | 2023 | Computers, Materials & Continua2023，，3： | 0 |
| 5 | Neodymium and samarium codoped PLZT ferroelectric ceramics for potential betavoltaic nuclear batteries显示文摘In this work,neodymium(Nd)and samarium(Sm)codoped lead lanthanum zirconate titanate(PLZT)ceramics were prepared by a high-temperature solid-state method.The samples were characterized by X-ray diffraction,scanning electron microscopy and ferroelectric analysis.Rare earth-doped PLZT ceramics show good phase formation.An appropriate rare earth element doping amount increases the densities of PLZT ceramics and reduces their resistivities,which is due to the role of rare earth elements in grain refinement.However,the increase in the amount of grain boundaries caused by grain refinement also affects domain inversion.Therefore,with increasing doping concentration,the remnant polarization of PLZT gradually decreases,and the doping of rare earth elements also slightly reduces the band gap of PLZT.Under irradiation with an X-ray simulated beta source with a particle energy of 10 keV(between the average energies of the beta particles of^3H and^(63)Ni),the ceramic sheets in this work produce current densities of up to 1.38 nA/cm^2.This indicates that Nd and Sm codoped PLZT ceramics have a certain potential for application in betavoltaic batteries. | Zhixiong Song Jizhen Liu Liyan Xue Zhengming Jiang Fan Yang | 2023 | Journal of Rare Earths2023，41，10： | 0 |
| 6 | Novel Sc-doped Bi_(3)TiNbO_(9) ferroelectric nanofibers prepared by electrospinning for visible-light photocatalysis显示文摘In this work,a novel Sc-doped Bi_(3)TiNbO_(9) ferroelectric nanofiber was first prepared by electrospinning.The nanofibers are approximately 100 nm level in diameter.The photocatalytic activity analysis reveals that the Bi_(3)TiNbO_(9) nanofibers synthesized by electrospinning are superior to powders prepared by the solid-state method,which is mainly attributed to the high specific surface area and high surface activity of the nanofibers.In addition,doping Sc can reduce the band gap of Bi_(3)TiNbO_(9) and further improve the photocatalytic efficiency.Bi_(3)TiNbO_(9) nanofibers containing 5 mol%Sc have the highest photocatalytic activity,which can degrade 98.55%of RhB under 405 nm light irradiation for 120 min.In addition,the catalytic mechanism of the catalyst was obtained by scavenger tests,active species capture tests and band structure analyses.After three cycles of photocatalytic experiment,the degradation rate is decreased by only 2.42%,proving that the nanofibers catalyst has excellent stability.This work provides good prospects for the practical application of electrospinning technology in the field of photocatalysis. | Zhixiong Song Shuwen Yu Kaixian Wang Zhengming Jiang Liyan Xue Fan Yang | 2023 | Journal of Rare Earths2023，41，3： | 0 |
| 7 | 洁净间腔串装配与场致发射的关系显示文摘The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 MeV.It has four cryomodules,totally 22 superconducting cavities.The first two cryomodules,each consists of six Half Wave Resonators(HWRs)with=0.1,have the same structure.The third cryomodule is made up of five tapered HWRs with=0.15.The first three cryomodules are supplied by IMP and the fourth one by IHEP,which consists of five elliptical cavities with=0.21.This paper will show some interesting results about cavity string assembling in cleanroom and the onset of field emission. | Xiong Pingran Song Yukun Shi Zhixiong Guo Hao You Zhiming Jiang Tiancai Zhang Shengxue Yue Weiming Li Yongming Zhang Shenghu He Yuan | 2017 | IMP & HIRFL Annual Report2017，，1： | 0 |
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