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Method for UAV spraying pattern measurement with PLS model based spectrum analysis

International Journal of Agricultural and Biological Engineering 2020年第3期13卷 22-28页

作者： Ruirui Zhang Yao Wen Longlong Li Liping Chen Gang Xu Yanbo Huang Qing Tang Tongchuan Yi National Research Center of Intelligent Equipment for Agriculture Beijing Academy of Agricultural And Forestry SciencesBeijing 100097China Beijing Research Center of Intelligent Equipment for Agriculture Beijing Academy of Agricultural And Forestry SciencesBeijing 100097China National Center for International Research on Agricultural Aerial Application Technology Beijing Academy of Agricultural And Forestry SciencesBeijing 100097China Beijing Key laboratory of Intelligent Equipment Technology for Agriculture Beijing Academy of Agricultural And Forestry SciencesBeijing 100097China United States Department of Agriculture Agricultural Research ServiceCrop Production Systems Research UnitStoneville MS 38776USA

Unmanned aerial vehicle(UAV)chemical application is widely used for crop protection,and spraying pattern is one of the most important factors that influence the chemical control efficacy.A method for UAV spraying pattern measurement with partial least squares(PLS)model based spectrum analysis was proposed in this study to measure the UAV spraying pattern more *** method involved the steps of fluorescent tracer solution spray and its droplets collection,the spectrum on paper strip acquiring,spectrum processing and analysis,PLS *** order to verify the applicability of the method and obtain the parameters of the PLS model,UAV spraying experiments were performed in the *** Fluorescent tracer solution was sprayed and its droplets are collected by paper strip,and the original spectrum on paper strip obtained by a spectrometer was processed by the Savitzky-Golay and standard normalized variable(SNV)*** prediction model of coverage rate selected as the droplet deposition parameter to measure the UAV spraying pattern,was established by using PLS *** verify the superiority of the PLS model,a traditional linear regression(LR)model of coverage rate was established *** results demonstrate that the method with PLS model based spectrum analysis can measure the UAV spraying pattern effectively,and PLS model has a better performance of RV2=0.94 and RMSEP=0.9446 than that of the LR model.

关键词： pattern measurement UAV spraying spectrum model coverage rate partial least squares method

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Consensus Hologram QSAR Model Studying on the Aqueous Hydroxyl Radical Oxidation Reaction Rate Constants of Organic Micropollutants

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Chinese Journal of Structural Chemistry 2021年第8期40卷 985-993,967页

作者： JIAO Long LEI Bin QU Le LI Rui YAN Chun-Hua LI Hong College of Chemistry and Chemical Engineering Xi’an Shiyou UniversityXi'an 710065China Shaanxi Cooperative innovation Center of Unconventional Oil and Gas Exploration and Development Xi’an Shiyou UniversityXi'an 710065China College of Petroleum Engineering Xi’an Shiyou UniversityXi'an 710065China

The combination of hologram quantitative structure-activity relationship(HQSAR)and consensus modeling was employed to study the quantitative structure-property relationship(QSPR)model for calculating the aqueous hydroxyl radical oxidation reaction rate constants(kOH)of organic micropollutants(OMPs).Firstly,individual HQSAR model were established by using standard HQSAR *** optimal individual HQSAR model was obtained while setting the parameter of fragment distinction and fragment size to“B”and“3~6”***,consensus HQSAR model was established by building the regression model between the kOH and the hologram descriptors with consensus partial least-squares(cPLS)*** obtained individual and consensus HQSAR model were validated with a randomly selected external test *** result of external test set validation demonstrates that both individual and consensus HQSAR model are available for predicting the kOH of *** with the optimal individual HQSAR model,the established consensus HQSAR model shows higher prediction accuracy and *** is shown that the combination of HQSAR and consensus modeling is a practicable and promising method for studying and predicting the kOH of OMPs.

关键词： QSPR hologram QSAR consensus modeling organic micropollutants hydroxyl radical rate constant

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Streptomyces lydicus A_(01) affects soil microbial diversity, improving growth and resilience in tomato

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Journal of Integrative Plant Biology 2019年第2期61卷 182-196页

作者： Qiong Wu Caige Lu Mi Ni Hongli Wang Weicheng Liu Jie Chen The Key laboratory of Urban(South)Agriculture School of Agriculture and Biology Shanghai Jiao Tong University Laboratory of Biological Microbiology Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry Sciences

The actinomycete Streptomyces lydicus A_(01) promotes tomato seedling growth; however, the underlying mechanism is unclear. In this study, we investigated whether changes in soil microbial diversity, following Streptomyces lydicus A_(01) treatment, were responsible for the increased tomato seedling growth. Eukaryotic 18 S ribosomal DNA(rDNA) sequencing showed that S. lydicus A_(01)-treated and untreated soil shared 193 operational taxonomic units(OTUs), whereas bacterial 16 S rDNA sequencing identified 1,219 shared OTUs between the treated and untreated soil. Of the 42 dominant eukaryotic OTUs, eight were significantly increased and six were significantly decreased after A_(01) treatment. Of the 25 dominant bacterial OTUs, 12 were significantly increased and eight were significantly decreased after A_(01) *** of the eukaryotes and bacteria that increased in abundance exhibited growth promoting characteristics,which were mainly predicted to be associated with mineralization of nitrogen and phosphorus, phosphate solubilization, nutrient accumulation, and secretion of auxin, whereas some were related to plant protection,such as the degradation of toxic and hazardous substances. Soil composition tests showed that S. lydicus A_(01) treatment enhanced the utilization of nitrogen, phosphorus, and potassium in tomato seedlings. Thus, microbial fertilizers based on S. lydicus A_(01) may improve plant growth, without the detriment effects of chemical fertilizers.

关键词： OTU Streptomyces lydicus A affects soil microbial diversity improving growth and resilience in tomato

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Self-healing of microcapsule-based materials for highway construction:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第3期10卷 368-384页

作者： Enlin Ma Xi Chen Jinxing Lai Xiangze Kong Chunxia Guo School of Highway Chang'an UniversityXi'an 710064China Department of Civil Engineering Aalto UniversityAalto 00076Finland Southwest Municipal Engineering Design&Research Institute of China Chengdu 610299China Department of Chemistry and Materials Science Aalto UniversityAalto 00076Finland School of Science Xi'an University of Architecture and TechnologyXi'an 710055China

Maintaining the health and reliability of civil facilities is of strategic *** highway engineering,pavement cracking impairs the road service and travel comfort level,while structure cracking can cause catastrophic ***-based self-healing materials offer solutions to auto-recovery micro-cracks and maintain structural *** solution has become available by laboratory synthesis and proved effective in addressing the cracking problem during long-term mechanical,thermal,and hydraulic ***,full-scale applications of this technique are not prevalent,showing its potential limitations in highway *** healing in highways is a big topic,therefore,this review has two insertion points.(1)We focus on the cracking issues on two specific materials:asphalt and concrete,which account for the vast majority of all the materials used in pavement and structures in highways.(2)Instead of the laboratory studies,we pay more attention to the practical applications,the meaning of healing performance,and the adverse effects of microcapsules to the main structural components(i.e.,tunnel lining,bridge piers and beams)and pavement in *** practical significance of self-healing materials in highway projects was discussed from the three aspects:strength,durability,and stress *** difficulty in applying this new technique is also discussed from economic *** future-proofing,a material evaluation system that fits the load condition is *** self-healing technique brings composites a chance to interact with the environment,showing high potential for contributing to the development of various types of long-lasting infrastructures.

关键词： Road engineering Self-healing material Structure cracking Micro-encapsulation Facility lifetime

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Super-assembled sandwich-like Au@MSN@Ag nanomatrices for high-throughput and efficient detection of small biomolecules

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Nano Research 2022年第3期15卷 2722-2733页

作者： Dantong Zhao Chunxia Ma Meng Gao Yong Li Bo Yang Hui Li Runhao Zhang Minglu Hao Jing Huang Kang Liang Pu Chen Lei Xie Rong Rong Biao Kong College of Medicine Shandong University of Traditional Chinese MedicineJinan 250355China Shandong Analysis and Test Center National Supercomputer Research Center of Advanced MaterialsAdvanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Heze Institute for Food and Drug Control Heze 274000China School of Chemical Engineering and Graduate School of Biomedical Engineering The University of New South WalesNSW 2052Australia Department of Chemical Engineering University of WaterlooWaterlooOntarioN2L 3G1Canada Department of Chemistry Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsiChEMFudan UniversityShanghai 200032China

Small biomolecules(m/z<500)are the material basis of organisms and participate in life activities,but their comprehensive and accurate detection in complex samples remains a ***-assisted laser desorption/ionization mass spectrometry(MALDI-MS)is a powerful detection tool for molecular analysis with high *** development of a new matrix is essential to improve the efficiency of the MALDI-MS for molecular compound *** this work,the sandwich-like gold nanoparticles@mesoporous silica nanocomposite@silver nanoparticles(Au@MSN@Ag)nanospheres were prepared by layer-by-layer super-assembly strategy,and can be used as a novel matrix for the quantitative detection and enrichment of small biomolecules by *** sandwich-like nanospheres form a unique plasma resonant cavity that effectively absorbs the laser energy,while the homogeneous mesoporous structure of MSN can lock the analyte,which is essential for efficient LDI of small *** to traditional matrices,Au@MSN@Ag shows the advantages of low background,wide application range,high sensitivity,super high salt and protein tolerance,and good *** example,the detection limit of glucose was as low as 5 fmol,and showed a good linear relationship in the range of 1−750μg/***@MSN@Ag assisted LDI-MS allows the enrichment and detection of small molecules in traditional Chinese medicine(TCM)without derivatization and purification,classification of herbs using the accurate quantitative results oligosaccharides,and identification of gelatin by amino acid *** research could help in designing more efficient nanostructure matrices and further explored the application of LDI-MS.

关键词： matrix-assisted laser desorption/ionization mass spectrometry(MALDI-MS) matrix sandwich-like nanostructures small biomolecules traditional Chinese medicine(TCM)

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Colorimetric quantification of aqueous hydrogen peroxide in the DC plasma-liquid system

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Plasma Science and Technology 2021年第5期23卷 111-116页

作者： Renze YU Zhaoyuan LIU Jiao LIN Xinyi HE Linsheng LIU Qing XIONG Qiang CHEN Kostya(Ken)OSTRIKOV Shenzhen Research Institute of Xiamen University Institute of Electromagnetics and AcousticsFujian Provincial Key Laboratory of Plasma and Magnetic ResonanceKey Laboratory of Electromagnetic Wave Science and Detection TechnologyXiamen UniversityXiamen 361005People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Centre for Plasma BiomedicineXi’an Jiaotong UniversityXi’an 710049People’s Republic of China College of electronic engineering Guangxi Normal UniversityGuilin 541004People’s Republic of China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044People’s Republic of China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia

The quantification of hydrogen peroxide(H_(2)O_(2))generated in the plasma-liquid interactions is of great importance,since the H_(2)O_(2)species is vital for the applications of the plasma-liquid ***,we report on in situ quantification of the aqueous H_(2)O_(2)(H_(2)O_(2)aq)using a colorimetric method for the DC plasma-liquid systems with liquid as either a cathode or an *** results show that the H_(2)O_(2)aqyield is 8-12 times larger when the liquid acts as a cathode than when the liquid acts as an *** conversion rate of the gaseous OH radicals to H_(2)O_(2)aqis 4-6 times greater in the former ***,the concentrations of dissolved OH radicals for both liquid as cathode and anode are of the same order of tens of n M.

关键词： plasma-liquid interactions hydrogen peroxide OH radical atmospheric-pressure plasma

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BDS/GPS deformation analysis of a long-span cable-stayed bridge based on colored noise filtering

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Geodesy and Geodynamics 2023年第2期14卷 163-171页

作者： Jun Ma China Railway Siyuan Survey and Design Group Co. LTDWuhan 430079China School of Surveying and mapping Wuhan UniversityWuhan 430079China

Combining GPS and BDS technology to monitor the deformation of long-span railway bridges with stricter deformation control requirements is of significance to the safety and control of the bridge and the safety of railway *** studies have ignored the influence of coloured noise in the deformation time *** is not conducive to accurate deformation analysis of long-span railway ***,GPS,BDS and GPS/BDS monitoring data of Ganjiang Bridge located in Ganzhou city,Jiangxi Province,China are adopted in this paper to filter the coloured noise in the deformation time series by principal component analysis(PCA),and the influence of coloured noise on the deformation analysis results of railway bridge is *** experimental results show that the diurnal temperature difference causes the mid-span and the tower of the railway cable-stayed bridge to deform with a period of about one day in the vertical and longitudinal directions,*** colored noise will make the uncertainty of the deformation parameter estimation overly *** can significantly reduce the coloured noise,and thus reduce the uncertainty of deformation parameter estimation by about 73%.Moreover,the average difference between the daily periodic motion amplitudes of the monitoring points obtained by using GPS and BDS deformation time series is 1.65 *** use of GPS/BDS deformation time series is not only helpful to reduce the influence of coloured noise,but also can reduce the difference between amplitude analysis results obtained from GPS and BDS deformation time series.

关键词： Long-span railway bridges GNSS deformation monitoring Coloured noise PCA

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Passive IoT Localization Technology Based on SD-PDOA in NLOS and Multi-Path Environments

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Computers, Materials & Continua 2024年第7期80卷 913-930页

作者： Junyang Liu Yuan Li Yulu Zhang Shuai Ma Gui Li Yi He Haiwen Yi Yue Liu Xiaotao Xu Xu Zhang Jinyao He Guangjun Wen Jian Li School of Information and Communication Engineering/Yibin Institute University of Electronic Science and Technology of ChinaChengdu611731China Department of IoT Technology Research China Mobile Research InstituteBeijing100053China The 10th Research Institute of China Electronics Technology Group Corporation Chengdu611731China College of Information and Communication National University of Defense TechnologyWuhan430019China

Addressing the challenges of passive Radio Frequency Identification(RFID)indoor localization technology in Non-Line-of-Sight(NLoS)and multipath environments,this paper presents an innovative approach by introducing a combined technology integrating an improved Kalman Filter with Space Domain Phase Difference of Arrival(SD-PDOA)and Received Signal Strength Indicator(RSSI).This methodology utilizes the distinct channel characteristics in multipath and NLoS contexts to effectively filter out interference and accurately extract localization information,thereby facilitating high precision and stability in passive RFID *** efficacy of this approach is demonstrated through detailed simulations and empirical tests conducted on a custom-built experimental platform consisting of passive RFID tags and an R420 *** findings are significant:in NLoS conditions,the four-antenna localization system achieved a notable localization accuracy of 0.25 m at a distance of 5 *** complex multipath environments,this system achieved a localization accuracy of approximately 0.5 m at a distance of 5 *** compared to conventional passive localization methods,our proposed solution exhibits a substantial improvement in indoor localization accuracy under NLoS and multipath *** research provides a robust and effective technical solution for high-precision passive indoor localization in the Internet of Things(IoT)system,marking a significant advancement in the field.

关键词： Indoor localization multipath and NLoS environments combined SD-PDOA and RSSI technology

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A Novel Anti-Collision Algorithm for Large Scale of UHF RFID Tags Access Systems

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Computers, Materials & Continua 2024年第7期80卷 897-912页

作者： Xu Zhang Yi He Haiwen Yi Yulu Zhang Yuan Li Shuai Ma Gui Li Zhiyuan Zhao Yue Liu Junyang Liu Guangjun Wen Jian Li School of Information and Communication Engineering/Yibin Institute University of Electronic Science and Technology of ChinaChengdu611731China Department of IoT Technology Research China Mobile Research InstituteBeijing100053China The 10th Research Institute of China Electronics Technology Group Corporation Chengdu611731China College of Information and Communication National University of Defense TechnologyWuhan430019China

When the radio frequency identification(RFID)system inventories multiple tags,the recognition rate will be seriously affected due to *** on the existing dynamic frame slotted Aloha(DFSA)algorithm,a sub-frame observation and cyclic redundancy check(CRC)grouping combined dynamic framed slotted Aloha(SUBF-CGDFSA)algorithm is *** algorithm combines the precise estimation method of the quantity of large-scale tags,the large-scale tags grouping mechanism based on CRC pseudo-randomcharacteristics,and the Aloha anti-collision optimization mechanism based on sub-frame *** grouping tags and sequentially identifying themwithin subframes,it accurately estimates the number of remaining tags and optimizes frame length accordingly to improve efficiency in large-scale RFID *** outcomes demonstrate that this proposed algorithmcan effectively break through the system throughput bottleneck of 36.8%,which is up to 30%higher than the existing DFSA standard scheme,and has more significant advantages,which is suitable for application in largescale RFID tags scenarios.

关键词： Radio frequency identification anti-collision tags grouping dynamic framed slotted Aloha

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