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Method for the classification of tea diseases via weighted sampling and hierarchical classification learning

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 211-221页

作者： Rujia Li Weibo Qin Yiting He Yadong Li Rongbiao Ji Yehui Wu Jiaojiao Chen jianping yang College of Big Data Yunnan Agricultural UniversityKunming 650201China College of Plant Protection Jilin Agricultural UniversityChangchun 130118China

This study proposed a weighted sampling hierarchical classification learning method based on an efficient backbone network model to address the problems of high costs,low accuracy,and time-consuming traditional tea disease recognition *** method enhances the feature extraction ability by conducting hierarchical classification learning based on the EfficientNet model,effectively alleviating the impact of high similarity between tea diseases on the model’s classification *** better solve the problem of few and unevenly distributed tea disease samples,this study introduced a weighted sampling scheme to optimize data processing,which not only alleviates the overfitting effect caused by too few sample data but also balances the probability of extracting imbalanced classification *** experimental results show that the proposed method was significant in identifying both healthy tea leaves and four common leaf diseases of tea(tea algal spot disease,tea white spot disease,tea anthracnose disease,and tea leaf blight disease).After applying the“weighted sampling hierarchical classification learning method”to train 7 different efficient backbone networks,most of their accuracies have *** EfficientNet-B1 model proposed in this study achieved an accuracy rate of 99.21%after adopting this learning method,which is higher than EfficientNet-b2(98.82%)and MobileNet-V3(98.43%).In addition,to better apply the results of identifying tea diseases,this study developed a mini-program that operates on *** can quickly obtain accurate identification results and corresponding disease descriptions and prevention methods through simple *** intelligent tool for identifying tea diseases can serve as an auxiliary tool for farmers,consumers,and related scientific researchers and has certain practical value.

关键词： tea diseases hierarchical classification learning weighted sampling classification method EfficientNet miniprogram

Recent Advances in Transition Metal-Based Catalysts for Electrocatalytic Nitrate Reduction Reaction

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Journal of Donghua University(English Edition) 2024年第4期41卷 333-348页

作者： LUO Hongxia CHEN Jun yang jianping State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteAustralian Institute of Innovative MaterialsUniversity of WollongongNew South WalesWollongong 2522Australia

The accumulation of excessive nitrate in the atmosphere not only jeopardizes human health but also disrupts the balance of the nitrogen cycle in the *** various nitrate removal technologies,electrocatalytic nitrate reduction reaction(eNO_(3)RR)has been widely studied for its advantages of being eco-friendly,easy to operate,and controllable under environmental conditions with renewable energy as the driving *** metal-based catalysts(TMCs)have been widely used in electrocatalysis due to their abundant reserves,low costs,easy-to-regulate electronic structure and considerable electrochemical *** addition,TMCs have been extensively studied in terms of the kinetics of the nitrate reduction reaction,the moderate adsorption energy of nitrogen-containing species and the active hydrogen supply *** on this,this review firstly discusses the mechanism as well as analyzes the two main reduction products(N_(2)and NH_(3))of eNO_(3)RR,and reveals the basic guidelines for the design of efficient nitrate catalysts from the perspective of the reaction ***,this review mainly focuses on the recent advances in the direction of eNO_(3RR)with four types of TMCs,Fe,Co,Ni and Cu,and unveils the interfacial modulation strategies of Fe,Co,Ni and Cu catalysts for the activity,reaction pathway and ***,reasonable suggestions and opportunities are proposed for the challenges and future development of eNO_(3)*** review provides far-reaching implications for exploring cost-effective TMCs to replace high-cost noble metal catalysts(NMCs)for eNO_(3)RR.

关键词： electrocatalysis nitrate reduction reaction transition metal-based catalyst(TMC) reaction mechanism nitrogen cycle

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人工智能技术在道路交通管理中的应用

数字通信世界 2024年第3期 105-107页

作者：杨建平北京中科软科技有限公司北京100090

随着城市化的进程不断加快,道路交通管理面临着越来越大的挑战。为了解决交通拥堵、事故频发和环境污染等问题,人工智能技术在道路交通管理中的应用变得愈发重要。人工智能技术能够通过数据分析、智能控制和预测模型等手段,实现对道路... 详细信息

随着城市化的进程不断加快,道路交通管理面临着越来越大的挑战。为了解决交通拥堵、事故频发和环境污染等问题,人工智能技术在道路交通管理中的应用变得愈发重要。人工智能技术能够通过数据分析、智能控制和预测模型等手段,实现对道路交通的优化管理,提高交通效率和安全性。通过收集道路交通数据,如车流量、速度和行驶路线等信息,人工智能能够快速分析数据并预测交通状况。根据预测结果,交通管理部门可采取有针对性的措施,如调整信号灯的配时、引导交通流动等,从而合理分配交通资源,减少交通拥堵现象。文章将针对人工智能技术在道路交通管理中的应用展开相应分析,以供参考。

关键词：人工智能技术道路交通管理应用

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HPPO装置能耗影响因素分析

上海化工 2024年第2期49卷 19-23页

作者：杨建平中石化上海工程有限公司上海200120

在不同反应温度、反应压力、丙烯质量空速、甲醇/过氧化氢物质的量比、丙烯/过氧化氢物质的量比、pH等工艺参数条件下,比较了不同规模过氧化氢制环氧丙烷(HPPO)装置TS-1(进口)、HTS(国产)催化剂的性能,HTS催化剂性能处于国际领先水平,... 详细信息

在不同反应温度、反应压力、丙烯质量空速、甲醇/过氧化氢物质的量比、丙烯/过氧化氢物质的量比、pH等工艺参数条件下,比较了不同规模过氧化氢制环氧丙烷(HPPO)装置TS-1(进口)、HTS(国产)催化剂的性能,HTS催化剂性能处于国际领先水平,过氧化氢和丙烯物耗也较低。在反应温度25~90℃,反应压力0.2~3.4MPa范围内,HPPO装置综合能耗先升高后降低,达到最低值后继续升高。在最佳反应温度58~67℃和最佳反应压力1.5~2.4MPa时,HPPO装置综合能耗相对较低。在非最佳反应温度和反应压力范围内,若其他技术取得进步或突破,可进一步大幅度降低HPPO装置能耗。

关键词：环氧丙烷工艺参数催化剂能耗

优化HPPO装置工艺技术降低CO_(2)排放

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石油化工 2024年第4期53卷 572-578页

作者：杨建平汪薇何琨王卓超中石化上海工程有限公司上海200120 华东理工大学化工学院上海200237

采用中国石化的全套过氧化氢直接氧化制环氧丙烷(HPPO)专利技术以及中国石化长岭分公司的工业HTS催化剂,以400 kt/a的HPPO装置为例,在反应温度25~90℃、反应压力0.2~3.4 MPa、丙烯质量空速0.4~8.0 h^(-1)、甲醇/过氧化氢摩尔比4~20、丙... 详细信息

采用中国石化的全套过氧化氢直接氧化制环氧丙烷(HPPO)专利技术以及中国石化长岭分公司的工业HTS催化剂,以400 kt/a的HPPO装置为例,在反应温度25~90℃、反应压力0.2~3.4 MPa、丙烯质量空速0.4~8.0 h^(-1)、甲醇/过氧化氢摩尔比4~20、丙烯/过氧化氢摩尔比1.2~10.0、pH=8.7~9.7的范围内,采用Aspen Plus软件对HPPO装置的环氧化反应单元的CO_(2)排放量进行计算。计算结果表明,改变反应温度和反应压力影响CO_(2)排放量,CO_(2)排放量由高到低,达到最低值后,由低到高;CO_(2)减排量为687.91~2942.59 t/a;各参数对CO_(2)减排量的影响程度从大到小依次为反应温度和反应压力、甲醇/过氧化氢摩尔比、丙烯/过氧化氢摩尔比、丙烯质量空速、pH。

关键词：环氧丙烷工艺技术 HTS催化剂工艺参数 CO_(2)减排

Tandem engineering for CO_(2)electrolysis toward multicarbon products

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Nano Research 2023年第7期16卷 8670-8683页

作者： Tinghui yang Min Kuang jianping yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Electrocatalysis of CO_(2)toward multicarbon(C_(2+))products have multifaceted applications in the energy and chemical industries,offers an attractive route to mitigate carbon emissions and abate the depletion of fossil ***,the productivity of CO_(2)-to-C_(2+)products suffers from a low selectivity and reaction rate owing to the difficulty in C-C coupling and the multiple electronproton transfer ***,numerous tandem catalysts have been developed to improve the selectivity and formation rate of CO_(2)-to-C_(2+)products via coupled multiple reaction steps,exhibiting high industrial *** review summarized recent progresses in the formation of C_(2+)products from CO_(2)electrolysis on tandem *** this review,we highlight the cooperative regulation strategy of tandem catalysts formed by introducing different types of new components and reveal the relationships between*CO intermediate mass transport and the selectivity of C_(2+)***,theoretical insight into the tandem catalytic mechanisms underlying the enhanced C_(2+)selectivity is also ***,the remaining challenges and opportunities for the electrocatalytic CO_(2)toward C_(2+)products are discussed.

关键词： CO_(2)electrolysis tandem catalysts mass transports spillovers multicarbon compounds

聚醚砜多孔纤维网纱层间增韧碳纤维/环氧复合材料的性能

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材料研究学报 2024年第1期38卷 33-42页

作者：李朝阳薛怿阳泽濠赵庆志彭砚双刘勇杨建平张辉东华大学材料科学与工程学院纤维材料改性国家重点实验室上海201620 东华大学民用航空复合材料协同创新中心上海201620

先用湿法纺丝制备聚醚砜(PES)多孔纤维并进行湿法抄造制备出四种不同面密度的PES多孔纤维网纱(PESV),用真空辅助树脂灌注成型(VARI)制备出聚醚砜多孔纤维网纱层间增韧碳纤维/环氧复合材料。研究了PES多孔纤维在环氧树脂的溶解行为以及... 详细信息

先用湿法纺丝制备聚醚砜(PES)多孔纤维并进行湿法抄造制备出四种不同面密度的PES多孔纤维网纱(PESV),用真空辅助树脂灌注成型(VARI)制备出聚醚砜多孔纤维网纱层间增韧碳纤维/环氧复合材料。研究了PES多孔纤维在环氧树脂的溶解行为以及复合材料的Ⅰ型层间断裂韧性(G_(IC))和Ⅱ型层间断裂韧性(G_(ⅡC))、层间剪切强度和弯曲性能,并分析了复合材料层间断裂的微观形貌。结果表明,固化温度为180℃时,PES多孔纤维完全溶解在环氧树脂中;PESV面密度为31.6 g/m^(2)时CF/EP复合材料的G_(IC)和G_(ⅡC)最佳,分别提高了54.4%和62.2%。其原因是,PES多孔纤维在环氧树脂中溶解后相分离形成了PES/环氧树脂的两相结构,改善了层间韧性;PESV面密度为21.9 g/m^(2)时,复合材料的层间剪切强度、弯曲强度和弯曲模量也分别提高了2.9%、4.0%和7.7%。

关键词：复合材料层间增韧碳纤维聚醚砜纤维网纱

Inconel-52M焊丝高频脉冲TIG电弧及熔池流动行为研究

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焊接学报 2024年第1期45卷 1-9,I0003页

作者：旷小聪齐铂金杨建平鲁应焱北京航空航天大学北京100191 北京遥感设备研究所北京100854 东方电气集团东方汽轮机有限公司德阳618000 杭氧集团股份有限公司杭州310000

基于高速摄像机和图像处理技术,分析了脉冲频率(0~60 kHz)对焊接电弧和Inconel-52M镍合金焊丝熔池流动行为的影响及其作用规律.结果表明,在常规低频脉冲电流上复合高频脉冲电流会使电弧形态显著收缩,随着高频脉冲频率的增加,电弧弧根尺... 详细信息

基于高速摄像机和图像处理技术,分析了脉冲频率(0~60 kHz)对焊接电弧和Inconel-52M镍合金焊丝熔池流动行为的影响及其作用规律.结果表明,在常规低频脉冲电流上复合高频脉冲电流会使电弧形态显著收缩,随着高频脉冲频率的增加,电弧弧根尺寸逐渐减小.与常规低频脉冲焊相比,高频脉冲电弧的整体面积减小,核心区面积及其占比增加,电弧能量集中度和温度(能量)得到提高.在高频脉电流的作用下,电弧轴向压强和径向电磁力增大,最大可分别提高18.0%和8.1%.电弧轴向电磁压强增大导致熔池流动性增强,使焊缝液态金属流动更充分,从而易形成大焊缝宽度和低润湿角的焊缝形貌.

关键词：高频脉冲电流电弧电磁力熔池流动

Studies on eco-environmental change in source regions of the yangtze and Yellow Rivers of China:present and future

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Research in Cold and Arid Regions 2019年第3期11卷 173-183页

作者： jianping yang State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences

The source regions of the yangtze and Yellow Rivers are important in the field of eco-environmental change research in China because of its distinct alpine ecosystem and cryosphere environment. At present, there are three different concepts on the extent of source areas of the yangtze and Yellow Rivers: hydrological, geographical, and eco-environmental. Over the past decades, annual average air temperature has warmed significantly;moreover, the temperature rise rate increases notably with increase of time of the data series. Annual precipitation has no obvious increase or decrease trend, and the climate has become warm and dry in the source regions. As a result, the cryosphere in the regions has shrunk significantly since 1960 s. A warm and dry climate and changing cryosphere together induced a substantial declination of alpine wetlands, marked decrease in river runoff, significant degradation of alpine grassland, and a reduction of engineering *** ecological environment, however, has a tendency for restoration in the regions because the climate has become gradually warm and wet since 2000. Thus, studies on eco-environmental change is transforming from a single element to multidisciplinary integration. Climate change-cryopshere change-physical and socioeconomic impacts/risk-adaptation constitute a chain of multidisciplinary integration research.

关键词： cryosphere change hydrological system alpine grassland the source regions of the yangtze and Yellow Rivers present and future