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Development of an automatic monitoring system for rice light-trap pests based on machine vision

Journal of Integrative Agriculture 2020年第10期19卷 2500-2513页

作者： YAO Qing FENG Jin TANG Jian XU Wei-gen ZHU Xu-hua yang Bao-jun LU Jun XIE Yi-ze YAO Bo WU Shu-zhen kuai nai-yang WANG Li-jun School of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018P.R.China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006P.R.China Plant Protection Quarantine and Pesticide Management Station of ZhejiangHangzhou 310020P.R.China Zhejiang Top Cloud-agri Technology Co Ltd.Hangzhou 310015P.R.China Agricultural Technology Extension Center of Shangyu Shaoxing 312300P.R.China Agricultural Technology Extension Center of Keerqin Keerqin 137713P.R.China

Monitring pest populations in paddy fields is important to effectively implement integrated pest *** traps are widely used to monitor field pests all over the *** conventional light traps still involve manual identification of target pests from lots of trapped insects,which is time-consuming,labor-intensive and error-prone,especially in pest peak *** this paper,we developed an automatic monitoring system for rice light-trap pests based on machine *** system is composed of an itelligent light trap,a computer or mobile phone client platform and a cloud *** light trap firstly traps,kills and disperses insects,then collects images of trapped insects and sends each image to the cloud *** target pests in images are automatically identifed and counted by pest identification models loaded in the *** avoid light-trap insects piling up,a vibration plate and a moving rotation conveyor belt are adopted to disperse these trapped *** was a close correlation(r=0.92)between our automatic and manual identification methods based on the daily pest number of one-year images from one light *** experiments demonstrated the effectiveness and accuracy of our automatic light trap monitoring system.

关键词： automatic monitoring system light trap rice pest machine vision image processing convolutional neural network

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Detecting Fake News Over Online Social Media via Domain Reputations and Content Understanding

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Tsinghua Science and Technology 2020年第1期25卷 20-27页

作者： kuai Xu Feng Wang Haiyan Wang Bo yang School of Mathematical and Natural Sciences Arizona State UniversityGlendaleAZ 85306USA Jiangxi University of Finance and Economics Nanchang 330013China

Fake news has recently leveraged the power and scale of online social media to effectively spread misinformation which not only erodes the trust of people on traditional presses and journalisms, but also manipulates the opinions and sentiments of the public. Detecting fake news is a daunting challenge due to subtle difference between real and fake news. As a first step of fighting with fake news, this paper characterizes hundreds of popular fake and real news measured by shares, reactions, and comments on Facebook from two perspectives:domain reputations and content understanding. Our domain reputation analysis reveals that the Web sites of the fake and real news publishers exhibit diverse registration behaviors, registration timing, domain rankings, and domain popularity. In addition, fake news tends to disappear from the Web after a certain amount of time. The content characterizations on the fake and real news corpus suggest that simply applying term frequency-inverse document frequency(tf-idf) and Latent Dirichlet Allocation(LDA) topic modeling is inefficient in detecting fake news,while exploring document similarity with the term and word vectors is a very promising direction for predicting fake and real news. To the best of our knowledge, this is the first effort to systematically study domain reputations and content characteristics of fake and real news, which will provide key insights for effectively detecting fake news on social media.

关键词： social media fake news detection content modeling domain reputations

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Effects of paclobutrazol on biomass production in relation to resistance to lodging and pod shattering in Brassica napus L.

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Journal of Integrative Agriculture 2017年第11期16卷 2470-2481页

作者： kuai Jie LI Xiao-yong yang yang ZHOU Guang-sheng College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 P.R. China

Paclobutrazol was sprayed at 0, 150, and 300 mg L-1 during the closed canopy stage and the early bud stage with two high-yielding cultivars of rapeseed, yangguang 2009 and Fengyou 520. The impact of paclobutrazol on the accumulation and distribution of biomass and its relationship with yield, resistance to lodging and pod shattering were determined. All the treatments increased the resistance as well as yield. The maximum yield was obtained when paclobutrazol was applied during the closed canopy stage at 150 mg L-1. The plant＇s resistance to both lodging and pod shattering was the maximum when paclobutrazol was applied during the early bud stage at 300 mg L-1. Paclobutrazol also delayed senescence, with the higher concentration or later spraying leading to more obvious effects; improved the net assimilation rate before the early bud stage; and promoted the relative growth rate of the main growth organ at each stage of growth and maximized the rate and quantities of biomass accumulation. However, at the higher concentration and later spraying, the increments were smaller. The spraying also increased the rates of biomass allocation to roots, leaves, and pods, but the rate of allocation to stems decreased as the plants grew shorter. The higher allocation to roots and the lower allocation to stems favoured resistance to both lodging and pod shattering whereas higher allocation to leaves and pods favoured yield. The higher concentration or late spraying led to excessive biomass being allocated to roots, which decreased leaf biomass during the bud stage, leading to greater resistance but lower yields.

关键词： rapeseed paclobutrazol biomass yield resistance to lodging and shattering

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Wide-field optical sizing of single nanoparticles with 10 nm accuracy

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Science China(Physics,Mechanics & Astronomy) 2021年第9期64卷 56-66页

作者： yang Liu Yan kuai Qiwen Zhan Joseph R.Lakowicz Douguo Zhang Advanced Laser Technology Laboratory of Anhui Province Department of Optics and Optical EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Center for Fluorescence Spectroscopy Department of Biochemistry and Molecular BiologyUniversity of Maryland School of MedicineBaltimore 21201USA

There is an increasing demand for new technologies to rapidly measure individual nanoparticles in situ for applications,including early-stage diagnosis of human diseases and environmental ***,we demonstrate a label-free wide-field optical microscopy capable of sizing dispersed non-luminescent dielectric nanoparticles(with diameters down to 22 nm)with 10 nm *** technique utilizes enhanced nanoparticle-perturbed scattering by surface plasmons created on a gold *** the meantime,an azimuthal rotation illumination module is installed on this microscope and a differential image processing technique is carried *** relationship between the scattering intensity and the particle size was experimentally measured with good consistency with the theoretical *** capability of precise measurement of the size of dispersed nanoparticles within a larger field of view in a label-free,non-invasive and quantitative manner may find broad applications involving single nanoparticle chemistry and physics.

关键词： plasmonic microscopy label-free imaging single nanoparticle optical sizing imaging and sensing

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Fast Fourier single-pixel imaging based on Sierra–Lite dithering algorithm

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Chinese Physics B 2019年第6期28卷 189-194页

作者： Zhen-Yu Liang Zheng-Dong Cheng Yan-Yan Liu kuai-kuai Yu yang-Di Hu National University of Defense Technology State Key Laboratory of Pulsed Power Laser TechnologyHefei 230037China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300000China

The single-pixel imaging(SPI) technique is able to capture two-dimensional(2 D) images without conventional array sensors by using a photodiode. As a novel scheme, Fourier single-pixel imaging(FSI) has been proven capable of reconstructing high-quality images. Due to the fact that the Fourier basis patterns(also known as grayscale sinusoidal patterns)cannot be well displayed on the digital micromirror device(DMD), a fast FSI system is proposed to solve this problem by binarizing Fourier pattern through a dithering algorithm. However, the traditional dithering algorithm leads to low quality as the extra noise is inevitably induced in the reconstructed images. In this paper, we report a better dithering algorithm to binarize Fourier pattern, which utilizes the Sierra–Lite kernel function by a serpentine scanning method. Numerical simulation and experiment demonstrate that the proposed algorithm is able to achieve higher quality under different sampling ratios.

关键词： single-pixel imaging binary Fourier basis pattern the dithering algorithm

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A new flame-retardant polymer electrolyte with enhanced Li-ion conductivity for safe lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第2期31卷 616-622页

作者： Hongping Li Yixi kuai Jun yang Shin-ichi Hirano Yanna Nuli Jiulin Wang School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Hirano Institute for Materials Innovation Shanghai Jiao Tong UniversityShanghai 200240China c College of Chemistry Zhengzhou UniversityZhengzhou 450001HenanChina

Flame-retardant polymer electrolytes(FRSPEs)are attractive due to their potential for fundamentally settling the safety issues of liquid ***,the current FRSPEs have introduced large quantity of flame-retardant composition which cannot conduct lithium ions,thus decreasing the Li-ion ***,we synthesize a novel liquid monomer 2-((bis((2-oxo-1,3-dioxolan-4-yl)methoxy)phosphoryl)oxy)ethyl acrylate(BDPA)for preparing FRSPE by in-situ polymerization,in which PBDPA polymer can not only conduct lithium ions,but also prevent *** prepared FRSPE demonstrated outstanding flame-retardant property,favorable lithium-ion conductivity of 5.65×10^(-4) S cm^(-1) at ambient temperature,and a wide electrochemical window up to 4.5 ***,the Li/in-situ FRSPE/S@pPAN cell exhibited favorable electrochemical *** believe that this work provides an effective strategy for establishing high-performance fireproof quasi-solid-state battery system.

关键词： Polymer electrolyte Flame-retardance Lithium-ion conductivity Lithium-sulfur battery

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AtCLH2, a Typical but Possibly Distinctive Chlorophyllase Gene in Arabidopsis

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Journal of Integrative Plant Biology 2007年第4期49卷 531-539页

作者： yang Liao Kun An Xiao Zhou Wen-Jun Chen Ben-Ke kuai State Key Laboratory of Genetic Engineering Department of Biochemistry School of Life Sciences Fudan University Shanghai 200433 China

Chlorophyllase （EC 3.***.1.14） is involved in the first step of chlorophyll degradation. Isolation of chlorophyllase genes greatly facilitates characterization of chlorophyllase properties and elucidation of molecular regulation of their in vivo activities. There are two chlorophyllase genes, AtCLH1 and AtCLH2, in Arabidopsis thaliana. The in vivo roles of AtCLH1 have been reported previously. However, few studies have been carried out on AtCLH2. Here, we show that purified recombinant Chlase2, encoded by AtCLH2, exhibits in vitro chlorophyllase activity. Interestingly, ＂activation＂ of in vitro activity of the recombinant Chlase2 required higher concentrations of a detergent or a polar solvent. To determine its activity in vivo, the expression of AtCLH2 was inhibited by RNA interference. Rnai plants showed decreased contents of chlorophyllide without a substantial change in the total amount of the extractable chlorophyll and consequently presented lower chlorophyllide to chlorophyll ratios in their leaves. In addition, the two AtCLHs exhibited differential expression patterns. Our results suggest that AtCLH2 might play a distinctive role in chlorophyll catabolism in vivo.

关键词： Arabidopsis AtCLH1 AtCLH2 chlorophyllase chlorophyll degradation RNA interference.

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Photocatalytic applications and modification methods of two-dimensional nanomaterials:a review

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Tungsten 2024年第1期6卷 77-113页

作者： Fan yang Ping Hu Fan yang Xing-Jiang Hua Bo Chen Lili Gao kuai-She Wang School of Metallurgy Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National and Local Joint Engineering Research Center for Functional Materials Processing Xi’an University of Architecture and TechnologyXi’an 710055China

Due to its unique electronic structure and special size effect,two-dimensional(2D)nanomaterials have shown great potential far beyond bulk materials in the field of *** to deeply explore the photocatalytic mechanism of 2D nanomaterials and design more efficient 2D semiconductor photocatalysts are research *** review provides a comprehensive introduction to typical 2D nanomaterials and discusses their current application status in the field of *** effects of material properties such as band structure,morphology,crystal face structure,crystal structure and surface defects on the photocatalytic process are *** main modification methods are highlighted,including doping,noble metal deposition,heterojunction,thickness adjustment,defect engineering,and dye sensitization in 2D material ***,the future development of 2D nanomaterials is *** is hoped that this paper can provide systematic and useful information for researchers engaged in the field of photocatalysis.

关键词： Photocatalysis Two-dimensional Nanomaterials Bandgap Modification strategy

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Evaluation of Microstructure and Mechanical Property of FSW Welded MB3 Magnesium Alloy

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Journal of Iron and Steel Research International 2006年第4期13卷 75-78页

作者： WANG kuai-she SHEN yang yang Xi-rong WANG Xun-hong XU Ke-wei Metallurgical Engineering Department Xi＇an University of Architecture and Technology Xi＇an 710055 Shaanxi China State Key Laboratory for Mechanical Behavior of Material Xi＇an Jiao Tong University Xi＇an 710049 Shaanxi China

An experiment was carried out on the friction stir welding of MB3 magnesium alloy to determine welding parameters for obtaining an excellent weld appearance without void, cracking, or distortion. Frictional heat and plastic flow created fine and equiaxed grains in the weld nugget, and the elongated and recovered grains in the thermomechanically affected zone （TMAZ）. The grains in the heat affected zone （HAZ） grow slightly. The me- chanical property results show that maximum joint tensile strength can reach 97. 2% of the parent material, which is stronger than that of fusion joints; and the failure almost occurs in the heat affected zone.

关键词： friction stir welding magnesium alloy mierostrueture mechanical property

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Microstructure and tensile properties of Mo alloy synthetically strengthened by nano-Y_2O_3 and nano-CeO_2

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Rare Metals 2014年第1期33卷 58-64页

作者： Ren-Zhi Liu kuai-She Wang Peng-Fa Feng Geng An Qin-Li yang Hu Zhao Institute of Metallurgy Xi’an University of Architecture and Technology Laboratory of Molybdenum Metal and Its Processing Jinduicheng Moly Co. Ltd State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University

Nano-Y2O3 and nano-CeO2 of different weight ratio mixed with deionizing water were doped into MoO2 powder by liquid-solid doping method. The diameter 1.80 and 0.18 mm alloy wires of Mo-0.3Y, Mo-0.3Ce, and Mo-0.15Y-0.15Ce were prepared through reduction, iso- static pressing, sintering, and drawing. Tensile properties, second phase microstructure and fracture surface appear- ance of wires were analyzed. The better refining effect for Mo alloy powder can be gotten after two kinds of nano- particle oxide doped into MoO2 than only one doped. Nano-Y2O3 and nano-CeO2 have different influences on sintering process. For nano-CeO2, the constraining effect of grain growth focuses on the initial sintering stage, nano- Y2O3 plays refining grains roles in the later densification stage. Nano-Y2O3 is undistorted and keeps intact in the process of drawing; and nano-CeO2 is elongated and bro- ken into parts in the drawing direction. The strengthening effect of nano-Y2O3 and nano-CeO2 keeps the finer grains and superior tensile properties for Mo-0.15Y-0.15Ce wire.

关键词： Nano-Y2O3 Nano-CeO2 Mo alloy wire Microstructure Tensile property Fracture surface

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