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Detection of abnormal hydroponic lettuce leaves based on image processing and machine learning

Information Processing in Agriculture 2023年第1期10卷 1-10页

作者： Ruizhe Yang Zhenchao Wu Wentai Fang hongliang Zhang Wenqi Wang Longsheng Fu Yaqoob Majeed Rui Li Yongjie Cui College of Mechanical and Electronic Engineering Northwest A&F UniversityYanglingShaanxi 712100China xi’an Agriculture Machinery Management and Extension Station Xi’anShaanxi 710065China Key Laboratory of Agricultural Internet of Things Ministry of Agriculture and Rural AffairsYanglingShaanxi 712100China Shaanxi Key Laboratory of Agricultural Information Perception and Intelligent Service YanglingShaanxi 712100China Faculty of Agricultural Engineering and Technology University of AgricultureFaisalabad 38000Pakistan Center for Precision and Automated Agricultural Systems Washington State UniversityProsserWA 99350USA Suide County Lanhuahua Ecological Food Co. Ltd.SuideShaanxi 718000China

Accurate and fast detection of abnormal hydroponic lettuce leaves is primary technology for robotic *** and rotten leaves are main types of abnormal leaves in hydroponic *** study aims to demonstrate a feasibility of detecting yellow and rotten leaves of hydroponic lettuce by machine learning models,*** Linear Regression(MLR),K-Nearest Neighbor(KNN),and Support Vector Machine(SVM).One-way analysis of variance was applied to reduce RGB,HSV,and L*a*b*features number of hydroponic lettuce *** binarization,image mask,and image filling methods were employed to segment hydroponic lettuce from an image for models *** showed that G,H,and a*were selected from RGB,HSV,and L*a*b*for training *** took about 20.25 s to detect an image with 30244032 pixels by KNN,which was much longer than MLR(0.61 s)and SVM(1.98 s).MLR got detection accuracies of 89.48%and 99.29%for yellow and rotten leaves,respectively,while SVM reached 98.33%and 97.91%,*** was more robust than MLR in detecting yellow and rotten leaves of ***,it was possible for abnormal hydroponic lettuce leaves detection by machine learning methods.

关键词： Hydroponic lettuce Machine learning Image processing Abnormal leaves Automatic sorting

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手性超材料惯容吸振器的扭转振动抑制研究

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力学学报 2023年第10期55卷 2252-2260页

作者：李卉魏国崇姚红良彭禧东北大学机械工程与自动化学院沈阳110819

惯容结构常用于振动抑制中,有着较为良好的减振效果.而惯容与吸振器结合的新型吸振器具有轻量化的优点,然而设计复杂的惯容结构限制了惯容吸振器在振动领域的广泛应用.针对这一局限性,设计一种具有简单高效惯容结构的手性超材料惯容吸振... 详细信息

惯容结构常用于振动抑制中,有着较为良好的减振效果.而惯容与吸振器结合的新型吸振器具有轻量化的优点,然而设计复杂的惯容结构限制了惯容吸振器在振动领域的广泛应用.针对这一局限性,设计一种具有简单高效惯容结构的手性超材料惯容吸振器(CIDVA).首先引入了手性超材料的压缩−扭转耦合效应,并利用该效应放大惯容盘的扭转行程,形成惯容机制.为了保证惯容机制的可行,设计一种辅助机构来保证手性超材料的运动.其次研究了CIDVA结构和工作原理并进行有限元仿真分析,计算和验证其惯容放大常数.并在此基础上建立了CIDVA−主系统的动力学方程,对CIDVA−主系统在稳态和瞬态激励下的扭转振动抑制能力进行了研究,并与锁定CIDVA进行了对比.接着对惯容有效性进行了分析.最后,基于试验验证了CIDVA对主系统的扭转抑振能力.结果表明,CIDVA能在瞬态和稳态激励下有效抑制主系统扭转振动,且相较于传统DVA,能节省自身10倍以上的转动惯量.为DVA实现轻量化设计和高效的振动抑制提供了新思路和方法.

关键词：手性超材料惯容吸振器压扭耦合效应扭转振动振动抑制

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Outcomes and prognostic factors of fecal microbiota transplantation in patients with slow transit constipation:results from a prospective study with long-term follow-up

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Gastroenterology Report 2018年第2期6卷 101-107,I0002页

作者： Chao Ding Wenting Fan Lili Gu hongliang Tian xiaolong Ge Jianfeng Gong Yongzhan Nie Ning Li Department of General Surgery Drum Tower HospitalMedical School of Nanjing UniversityNanjingChina Department of General Surgery Jinling HospitalMedical School of Nanjing UniversityNanjingChina Medical Technology Institute of Xuzhou Medical University XuzhouChina Institute of Digestive Diseases Xi Jing HospitalFourth Military Medical UniversityXi’AnChina Shanghai Tenth People’s Hospital Tenth People’s Hospital of Tongji UniversityShanghaiChina

Background and aim:Gutmicrobiotamay contribute to regulate colonicmotility,which is involved in the etiology of *** transplantation(FMT)has been demonstrated to restore intestinal *** aimof this study was to evaluate the clinical outcomes and prognostic factors of FMT for the treatment of slow transit constipation(STC).Methods:Fifty-two patients with STC received standardized FMT and were followed up for 6 *** habit,colonic transit time,constipation-related symptoms(PAC-SYM score),quality of life(PAC-QOL score),treatment satisfaction scores and adverse events were *** primary efficacy endpoint was the proportion of patients having on average three or more complete spontaneous bowel movements(CSBMs)per ***:The primary efficacy endpoint was achieved in 50.0%,38.5%and 32.7%of patients over week intervals 3–4,9–12 and 21–24,respectively(P<0.01 for all comparisons).Significant improvements were also observed in other bowel movement assessments,colonic transit time,constipation-related symptoms and quality of life;but all improvements diminished at weeks 12 and *** of evacuation served as the only factor associated with *** serious treatmentrelated adverse events were ***:This study suggested FMT was effective and safe for STC,while a late loss of efficacy was also observed.A lower degree of sensation of incompleteness predicted a better outcome.

关键词： Fecal microbiota transplantation slow transit constipation gut microbiota colonic motility prognostic factors

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断陷湖盆沿层侵入火成岩、湖底扇砂岩体的定量化识别及预测方法-以海拉尔盆地乌尔逊凹陷为例

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Applied Geophysics 2023年第4期20卷 488-498,671页

作者：苏玉平陈广坡谢明贤 Zhengxi Xueluo hongliang 东北石油大学大庆163318 中国石油勘探开发研究院西北分院兰州730020 中国石油油藏描述重点实验室兰州730020

沿层侵入火成岩体和湖底扇砂岩体在地震波形上具有类似反射特征,将它们从地震资料中识别区分并实现定量化预测,是断陷湖盆岩性油气藏勘探面临的重大挑战之一。本文以海拉尔盆地乌尔逊凹陷为例,构建了沿层侵入火成岩体和湖底扇砂岩体的... 详细信息

沿层侵入火成岩体和湖底扇砂岩体在地震波形上具有类似反射特征,将它们从地震资料中识别区分并实现定量化预测,是断陷湖盆岩性油气藏勘探面临的重大挑战之一。本文以海拉尔盆地乌尔逊凹陷为例,构建了沿层侵入火成岩体和湖底扇砂岩体的地质模型并开展了地震正演模拟,确定上述两种地质体与地震敏感参数高亮体之间的相关关系,建立了定量解释图版,最终实现了两种地质体的定量识别、分布预测。研究发现,高亮体值大于630代表了沿层侵入火成岩的地震响应,小于380即为泥岩,介于二者之间则是湖底扇砂岩体的响应。基于模型正演的高亮体地震属性,可以用于定量区分沿层侵入火成岩和湖底扇砂岩体;实钻证实了预测结果,该方法具有在类似地区推广应用的价值。

关键词：沿层侵入火成岩湖底扇高亮体地震属性岩性油气藏

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Effects of Post-Heat Treatment and Carbide Precipitates on Strength-Ductility Balance of GH3536 Superalloy Prepared by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1667-1679页

作者： Le xia Haijun Su Quandong Hu Yinuo Guo Peixin Yang hongliang Gao Minghui Yu Min Guo Zhuo Zhang Lin Liu Hengzhi Fu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen518057China Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology InstituteBeijing100024China

The strength and ductility cannot achieve a good tradeoff for some superalloy(***3536)prepared by selective laser melting(SLM),which seriously restricts their industrial *** work examined the effect of post-heat treatment(HT)on the microstructure and mechanical properties of GH3536 produced by *** particular,the influence of carbide precipitate morphology and distribution on strength and ductility of the alloy after heat treatment was *** aging at 650°C(denoted as HT1),the Cr23C6 carbides were distributed in *** ductility increased by approximately 31%,while the strength slightly *** aging at 745°C(denoted as HT2),the Cr23C6 carbides were distributed in ***,the HT2 samples showed an increase in ductility of~58%and no reduction in *** the dislocation density of HT2 sample was higher than that of the HT1 sample,the chain carbides could be pinned to the grain boundaries,consequently improving the ductility but no loss in strength as compared with the as-deposited *** the aging temperature was increased to 900°C(denoted as HT3),the carbides were distributed in a discontinuous granular *** a result,the HT3 samples presented the lowest dislocation density which reduced the strength.

关键词： Selective laser melting GH3536 Heat treatment Carbides Strength-ductility

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～4.1 Ga xenocrystal zircon from Ordovician volcanic rocks in western part of North Qinling Orogenic Belt

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Chinese Science Bulletin 2007年第21期52卷 3002-3010页

作者： WANG hongliang CHEN Liang SUN Yong LIU xiaoMing xu XueYi CHEN JuanLu ZHANG Hong DIWU ChunRong State Key Laboratory of Continental Dynamics Northwest University Xi'an 710069 China xi'an Institute of Geology and Mineral Resource Xi'an 710054 China

High-precision U-Pb dating by in situ LA-ICP-MS yields an age of 4079±5 Ma for a xenocrystal zircon from Ordovician volcanics of the Caotangou Group in western part of the North Qinling Orogenic Belt. As a result, the North Qinling Orogenic Belt becomes one of a few localities in the world that contain Hadean age records (4276±6 Ma and 4404±8 Ma detrital zircons from Jack Hill of the Yilgarn craton, 4016 Ma Acasta gneisses of the Wopmay Orogeny and Burang quartzite with detrital zircon of 4103 Ma in Tibet). It is also the first report of the Hadean age in Phanerozoic volcanics. The finding of the 4.1 Ga xenocrystal zircon provides not only the geochronological record of the oldest crustal materials in China, but also the condition for further search for rocks forming in the region during the early time of the Earth’s evolution. Thirty-six zircon U-Pb dates from the Ordovician volcanic rocks are subgrouped into seven generations that represent different tectono-magmatic events in the North Qinling Orogenic Belt. Among them, two periods of 0.9-1.5 Ga and 0.4-0.5 Ga are consistent with Mesoproterozoic and Early Paleozoic orogenies, respectively.

关键词：火山石造山地带锆石地质学

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Construction of coxsackievirus B5 viruses with luciferase reporters and their applications in vitro and in vivo

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Virologica Sinica 2023年第4期38卷 549-558页

作者： Shangrui Guo Meng Xun Tingting Fan xinyu Li Haoyan Yao xiaozhen Li Bo Wu Hang Yang Chaofeng Ma hongliang Wang Department of Pathogen Biology and Immunology Xi’an Jiaotong University Health Science CenterXi’an710061China Department of Gynecology and Obstetrics The First Affiliated Hospital of Xi'an Jiaotong UniversityXi’an710061China Department of Viral Diseases Laboratory Xi’an Center for Disease Control and PreventionXi’an710061China

Coxsackievirus belongs to the Picornaviridae family and is one of the major pathogens that cause hand,foot and mouth disease(HFMD)in infants and children with potential serious complications and even *** pathogenesis of this virus is not fully elucidated and no vaccine or antiviral drug has been *** this study,a full-length infectious cDNA clone of coxsackievirus B5 virus was assembled and the recombinant virus displayed similar growth kinetics and ability to cause cytopathic effects as the parental *** reporter was then incorporated to generate both full-length and subgenomic replicon(SGR)reporter *** full-length reporter virus is suitable for high-throughput antiviral screening,while the SGR is a useful tool to study viral-host *** importantly,the full-length reporter virus has also been shown to infect the suckling mouse model and the reporter gene could be detected using an in vivo imaging system,thus providing a powerful tool to track viruses in *** summary,we have generated coxsackievirus B5 reporter viruses and provided unique tools for studying virus-host interactions in vitro and in vivo as well as for high-throughput screenings(HTS)to identify novel antivirals.

关键词： Coxsackievirus Luciferase High-throughput screening Mouse model

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Trajectory Tracking Control of Wheeled Mobile Robots Based on Integrated Intelligent Steering

Trajectory Tracking Control of Wheeled Mobile Robots Based o...

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2009 9th International Conference on Electronic Measurement & Instruments（ICEMI’2009）

作者： Kunpeng Li Sunan Wang Hongyu Di hongliang Li (School of Mechanical Engineering xi’an Jiaotong University xi’an 710049 Shaanxi Province China)

Aiming at solving the problem of trajectory tracking of the wheeled mobile robot,the paper presents an adaptive trajectory tracking method based on the kinematics *** analyzing the shortage of classical trajectory tracking control rule,the idea of the single point preview is introduced to the method to improve the effect of trajectory tracking,as well as an artificial field is combined with posture error to navigate the mobile *** structure of the control rule is simple and *** simulations indicate the method makes the approaching trajectory of the mobile robot becomes more perfect.

关键词： mobile robot trajectory tracking single point preview artificial field control rule

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钛酸四丁酯水解制备TiO_2半导体光催化剂研究

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环境科学学报 2001年第2期21卷 144-147页

作者：席北斗刘鸿亮清华大学环境工程系北京100084 中国环境科学研究院北京100012

研究了钛酸四丁酯水解制备TiO2 粉末的两大影响因素R值 (R是水和钛酸四丁酯的摩尔比 )和烧结温度 .通过光催化氧化五氯苯酚钠实验 ,结合对催化剂晶型结构、比表面积的表征分析 ,综合评价所制备的催化剂 .实验结果表明 ,当R =10 0、烧结... 详细信息

研究了钛酸四丁酯水解制备TiO2 粉末的两大影响因素R值 (R是水和钛酸四丁酯的摩尔比 )和烧结温度 .通过光催化氧化五氯苯酚钠实验 ,结合对催化剂晶型结构、比表面积的表征分析 ,综合评价所制备的催化剂 .实验结果表明 ,当R =10 0、烧结温度为 6 5 0℃、烧结时间为 1h ,钛酸四丁酯水解所制备的TiO2 半导体光催化剂催化活性和使用寿命均比较理想 .从晶型结构分析 ,当催化剂中锐钛矿和金红石按一定比例共存时 ,其催化活性较单一金红石或锐钛矿高 .实验认为锐钛矿与金红石的最佳比约为

关键词：钛酸四丁酯 R值二氧化钛半导体光催化剂烧结温度钛矿金红石光催化氧化五氯苯酚钠

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Polarization insensitive metamaterial absorber based on E-shaped all-dielectric structure

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Journal of Advanced Dielectrics 2015年第1期5卷 65-70页

作者： Liyang Li Jun Wang Hua Ma Jiafu Wang hongliang Du Shaobo Qu College of Science Air Force Engineering UniversityXi'an 710051 ShaanxiP.R.China

In this paper,we designed a metamaterial absorber performed in microwave frequency *** absorber is composed of E-shaped dielectrics which are arranged along different *** E-shaped all-dielectric structure is made of microwave ceramics with high permittivity and low *** about 1 GHz frequency band,more than 86%absorption efficiency was observed for this metamaterial *** absorber is polarization insensitive and is stable for incident *** is figured out that the polarization insensitive absorption is caused by the nearly located varied resonant modes which are excited by the E-shaped all-dielectric resonators with the same size but in the different *** E-shaped dielectric absorber contains intensive resonant *** research work paves a way for designing all-dielectric absorber.

关键词： Absorber all-dielectrics E-shaped microwave ceramics

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