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A topological framework for real-time 3D weather radar data processing

International Journal of Digital Earth 2022年第1期15卷 813-831页

作者： Mingyue Lu Zhangjian Chen Jin Wang Qian Zhang Zaiyang Ma Min Chen Yongning Wen Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & TechnologyNanjingPeople’s Republic of China School of Geography Science Nanjing University of Information Science & TechnologyNanjingPeople’s Republic of China Zhejiang Academy of Surveying and Mapping HangzhouPeople’s Republic of China School of Geomatics Science and Technology Nanjing Tech UniversityNanjingPeople's Republic of China Key Laboratory of Virtual Geographic Environment (Nanjing Normal University) Ministry of EducationNanjingPeople’s Republic of China School of Management Engineering Xi'an University of Finance and EconomicsXi'anPeople’s Republic of China

Real-time 3D weather radar data processing makes it possible to efficiently simulate meteorological processes in digital Earth and support the assessment of meteorological *** current real-time meteorological operation system can only deal with radar data within 2D space as a flat map and lacks supporting 3D ***,valuable 3D information imbedded in radar data cannot be completely presented to meteorological *** to the large amount of data and high complexity of radar data 3D operation,regular methods are not competent for supporting real-time 3D radar data processing and *** study aims to perform radar data 3D operations with high efficiency and instant speed to provide real-time 3D support for the meteorological *** this paper,a topological framework composed of basic inner topological objects is proposed along with the quadtree structure and LOD architecture,based on which 3D operations on radar data can be conducted in a split second and 3D information can be presented in real *** the applications of the proposed topological framework,two widely used 3D algorithms in the meteorological field are also implemented in this ***,a case study verifies the applicability and validity of the proposed topological framework.

关键词： Weather radar data 3D operations real-time topological framework

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Simultaneous Separation and Determination of Phenolic Isomers and Analogues in Flue Gas Aerosols

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SSRN 2024年

作者： Wang, Dongsheng Zhang, Di Shi, Lin Jiang, Wei Peng, Qiyuan Liu, Zhihua Si, Xiaoxi Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and Environment Linyi University Linyi276005 China Yunnan Key Laboratory of Tobacco Chemistry R&D Center of China Tobacco Yunnan Industry Co. Ltd. Kunming650231 China

To achieve the accurate quantification of phenolic substances in a complex matrix, a chiral column separation combined with gas chromatography‒mass spectrometry (GC‒MS) method for the simultaneous separation and detection of 43 phenolic substances was established and successfully applied to the determination of cigarette smoke aerosol particles. Smoking modes were selected according to the smoking behavior of different types of tobacco products. The smoke aerosol particles of 5 tobacco sticks were collected with a Cambridge filter and extracted by ethanol. CP-Cyclodextrin-β-2,3,6-M-19 columns were selected to separate them, and selected ion monitoring mode was selected for determination. The results showed that 43 phenolic substances achieved high separation without derivatization pretreatment and direct injection after ethanol extraction. The separation degrees of the chromatographic peaks were all greater than 1.268, and the chromatographic peaks were sharp and symmetrical. The limits of quantitation were 0.002-0.047 μg/mL, the recoveries were 75.3%-117.8%, and the relative standard deviations (RSD) were 0.7-9.2%. In addition, the matrix effect factor of this method ranges from 0.847 to 1.153, indicating high accuracy in the case of a high concentration of matrix interference. The analysis of 36 kinds of flue-cured tobacco samples and 13 kinds of cigarette matrices of nonburning cigarettes proved that the method was simple, accurate, reliable and sensitive and was suitable for the simultaneous separation and detection of monophenols and phenylcatechol compounds of different substitution types in complex matrices. © 2024, The Authors. All rights reserved.

关键词： Tobacco

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Removing DOM from chloride modified hydrochar could improve Cu2+ adsorption capacity from aqueous solution

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Chemosphere 2023年 342卷

作者： Yang, Rushi Feng, Shi Jin, Danyu Wang, Yulai Li, Detian Liang, Yunyi Wu, Jing School of Energy and Environment Anhui University of Technology Maanshan243002 China School of Environmental Science and Engineering Qingdao University Qingdao266071 China School of Marine Science and Engineering Qingdao Agricultural University Qingdao266109 China Key Laboratory of Agro-Environment in Downstream of Yangtze Plain Ministry of Agriculture and Rural Affairs Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences Nanjing210014 China College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China

The behavior and composition of hydrochar-based dissolved organic matter (DOM) would affect the efficiency of copper (Cu) removal from wastewater through adsorption. In this study, the reed was hydrolyzed in the presence of feedwater with and without ZnCl2, FeCl3, and SnCl4 to produce pristine hydrochars (PHCs), which were named H2O-HC, ZnCl2-HC, FeCl3-HC, and SnCl4-HC. After removal of DOM, washed hydrochars (WHCs) were obtained, labelled as W–H2O-HC, W-ZnCl2-HC, W-FeCl3-HC, and W-SnCl4-HC. The release dynamics of DOM from PHCs were analyzed, and the adsorption behaviors of Cu2+ on both PHCs and WHCs were investigated. The results showed that chloride-modifications were beneficial for the porosity, specific surface area (SSA), and functional groups of WHCs. Meanwhile, the quantity of hydrochar-based DOM was significantly affected by chloride-modifications. In particular, the relative contents of Ar–P and Fa-L in the DOM released from hydrochars varied with time and modification. Furthermore, the Qe of Cu2+ adsorption on WHCs followed the order of W-SnCl4-HC > W-FeCl3-HC > W-ZnCl2-HC > W–H2O-HC at 15 °C. Compared to PHCs, the adsorption capacity of Cu2+ on WHCs was improved by 7.15–119.77% at the temperature of 35 °C. Simultaneously, the adsorption capacity of Cu2+ in WHCs showed a significant correlation with the SSA via physical adsorption (P 2+ adsorption also occurred via complexation and chelation through newly formed Cu–O group between W-SnCl4-HC and Cu2+. Notably, the increase of Cu2+ adsorption in WHCs was significantly correlated with the release of Fa-L and Ar–P from PHCs (P 2+ adsorption. © 2023 Elsevier Ltd

关键词： Chlorine compounds

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U + LSTM-F: A data-driven growth process model of rice seedlings

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Ecological Informatics 2024年 84卷

作者： Tian, Xin Cao, Weifan Liu, Shaowen Zhang, Buyue Wei, Junshuo Ma, Zheng Gao, Rui Su, Zhongbin Dong, Shoutian Key Laboratory of Northeast Smart Agricultural Technology Ministry of Agriculture and Rural Affairs Heilongjiang Province Harbin 150030 China School of Electrical and Information Northeast Agricultural University Heilongjiang Province Harbin 150030 China Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical Ultrasound School of Biomedical Engineering Shenzhen University Medical School Shenzhen 518060 China School of Resource and Environment Northeast Agricultural University Heilongjiang Province Harbin 150030 China

Accurately predicting the growth status of rice seedlings and understanding their growth rate and health status in a timely manner helps adjust the growth cycle and management measures. By predicting the growth status of the seedlings, the best time for transplanting can be selected, improving the survival rate and overall health of the seedlings, thereby enhancing yield and quality. Therefore, this study proposes a data-driven time-series model, the U + LSTM-F model, for predicting the growth status of Wuyou Rice 4 seedlings. First, the U-Net model is employed to segment sequentially collected images, extracting features such as leaf age and stem length of the rice seedlings. Subsequently, the collected ambient temperature and humidity data are aligned with the leaf age and stem length data. Finally, the LSTM model is used for time-series analysis, enabling the model to learn the temporal relationship between environmental and growth data and predict the growth trend of the rice seedlings. Additionally, an attention mechanism is introduced to enhance model performance, and the model's effectiveness is evaluated using multiple quantitative metrics. The proposed model achieves an RMSE of 0.032 and MAPE of 0.895 % for leaf age prediction, and an RMSE of 0.067 and MAPE of 0.814 % for stem length prediction. The experimental results show that this data-driven approach, which combines growth data with environmental data, exhibits high accuracy in predicting the leaf age and stem length of rice seedlings. This provides a more accurate tool for predicting the growth of rice seedlings, offering valuable insights for rice seedling cultivation research. © 2024

关键词： Attention mechanism Data-driven time-series model Features extraction Rice seedlings growth status

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Magnetotactic bacteria:Characteristics and environmental applications

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Frontiers of environmental Science & engineering 2020年第4期14卷 3-16,F0004页

作者： Xinjie Wang Yang Li Jian Zhao Hong Yao Siqi Chu Zimu Song Zongxian He Wen Zhang State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkNJ 07102USA Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard Beijing International Cooperation Base for Science and Technology on Antibiotics/Resistance Genes Water Environmental Pollution Control TechnologySchool of Civil EngineeringBeijing Jiaotong UniversityBeijing 100044China

Magnetotactic bacteria(MTB)are a group of Gram-negative prokaryotes that respond to the geomagnetic *** unique property is attributed to the intracellular magnetosomes,which contains membrane-bound nanocrystals of magnetic iron *** review summarizes the most recent advances in MTB,magnetosomes,and their potential applications especially the environmental pollutant control or *** morphologic and phylogenetic diversity of MTB were first introduced,followed by a critical review of isolation and cultivation *** have devoted to optimize the factors,such as oxygen,carbon source,nitrogen source,nutrient broth,iron source,and mineral elements for the growth of *** the applications of MTB in modem biological and medical fields,little attention was made on the environmental applications of MTB for wastewater treatment,which has been summarized in this *** example,applications of MTB as adsorbents have resulted in a novel magnetic separation technology for removal of heavy metals or organic pollutants in *** addition,we summarized the current advance on pathogen removal and detection of endocrine disruptor which can inspire new insights toward sustainable engineering and ***,the new perspectives and possible directions for future studies are recommended,such as isolation of *** modification of MTB for mass production and new environmental *** ultimate objective of this review is to promote the applications of MTB and magnetosomes in the environmental fields.

关键词： Magnetotactic bacteria Magnetosome Heavy metal Radionuclide Organic pollutants

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Effect of high-frequency non-sinusoidal excitation on the magnetic moment deflection angular velocity of nanocrystalline alloys under saturation magnetization

Effect of high-frequency non-sinusoidal excitation on the ma...

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China International Electrical and Energy Conference (CIEEC)

作者： Yifan Wang Liang Zou Li Zhang Kaihang Guo Yongjian Li School of Electrical Engineering Shandong University Jinan China Dalian Power Supply Compny of State Grid Liaoning Electric Power Company Dalian China Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin China

The purpose of this paper is to establish a three-dimensional model of nanocrystalline alloy at the mesoscopic scale based on ***'s random anisotropy theory, and apply two non-sinusoidal excitations to the model. The magnetic moment deflection angular velocity w is defined, and the motion of the magnetic moment and the response to the applied magnetic field during the saturation magnetization of the material are explored from the micro level. The results show that for $\omega$ , under the excitation of triangular wave, increasing the amplitude of magnetic field and the frequency of alternating magnetic field can all accelerate the magnetic moment deflection and shorten the time of magnetization to saturation. While, for the square wave, the change of the magnetic field frequency does not affect w.

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Tailoring Interlayer Structure and Surface Chemical State Intensifies Redox Reaction Activity of Ti3c2tx Mxene

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SSRN 2023年

作者： Li, Zhenjiang Chen, Lihong Jing, Yunqi Dai, Jun Meng, Alan Sun, Changlong Zhao, Jian Wang, Lei Li, Guicun Xie, Haijiao Hu, Minmin School of Materials Science and Engineering Qingdao University of Science and Technology Qingdao266042 China College of Environment and Safety Engineering Qingdao University of Science and Technology Qingdao266042 China College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao266061 China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao266042 China Tongji University China

MXene, a new intercalation pseudocapacitive electrode material, stands a chance of enabling high capacitance and high rate for supercapacitor application. However, limited accessible interlayer space and active sites are major challenges to achieve the goal in practical application. Herein, a method of hydrothermal treatment in NaOH solution with reducing reagent-citric acid is firstly proposed. After this treatment, an expanded and homogenized interlayer space is created by Na+ intercalation, which acts as a "expressway" channel to expedite ion diffusion. −F terminations are replaced with O-containing groups, which enhances the hydrophilicity, facilitating electrolyte's accessibility to MXene's surface and makes MXene show stronger adsorption for electrolyte ion-H+, providing sufficient electrochemical active sites. The change of terminations further leads to the increase in Ti valence, which becomes more prone to be reduced. The tailoring of interlayer structure and surface chemistry state considerably intensifies the redox reaction activity of MXene, resulting in that H+ is intercalated into the interlays in an unhydrated form and interacts strongly with O-terminations. Consequently, a pair of clear redox peaks emerge in cyclic voltammograms and a record high capacitance of 543 F g−1 at 2 mV s−1 is obtained. This work establishes full knowledge for the rational MXene design for electrochemical energy storage applications. © 2023, The Authors. All rights reserved.

关键词： Supercapacitor

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Theoretical Study on the Reaction of Hono with Aromatic Criegee Intermediate C6H5CHOO

SSRN

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SSRN 2025年

作者： Zhu, Mincong Huang, Mingqiang Wei, Nana Liu, Xingqiang Zhao, Weixiong Gu, Xuejun Zhang, Weijun Zeng, Zhiwei Gao, Guangzhen Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology College of Chemistry & Chemical Engineering and Environment Minnan Normal University Zhangzhou363000 China College of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China School of Environment Science & Engineering Tan Kah Kee College Xiamen University Zhangzhou363105 China Laboratory of Atmospheric Physico-Chemistry Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei230031 China Minnan Normal University China Jiangsu Normal University China

HONO is a vital pollutant gas and nitrogen-containing organic compounds (NOCs) produced by its reaction are main components of aerosols. The reaction between HONO and the simplest aromatic Criegee intermediate (PhCHOO) are investigated by density functional theory and transition state theory in this study. Results demonstrate that cycloaddition of HONO and PhCHOO to form heteroozonide with the highest activation energy and smallest rate constant is not easy to occur. Pathways of oxygen atom transfer and cycloaddition can in-situ form HNO3 and benzoic acid. While, hydrogen atom transfer pathway results in generation of phenyl hydroperoxide methyl nitrite (Ph-HPMN), which has the lowest activation energy, dominating the reaction between HONO and PhCHOO with rate constant (2.26×10-12 cm3/(molecule•s)) is close to that of with OH radical (4.83×10-12 cm3/(molecule•s)). These provide theoretical reference for clarifying generation mechanism of NOCs formed from ozonolysis of styrene and other olefin compounds in presence of HONO. © 2025, The Authors. All rights reserved.

关键词： Activation energy

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Study on the Dual-Motion Fretting Wear Characteristics of Zr-4 Alloy Tube Under Different Radial Alternating Load and Temperature

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SSRN 2024年

作者： Ding, Siyuan Peng, Jinfang He, Zhiyi Xiao, Dingjun Li, Bo Liu, Jianhua Zhu, Minhao Tribology Research Institute State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu610031 China Key Laboratory of the Ministry of Education School of Material Science and Engineering Southwest Jiaotong University Chengdu610031 China Southwest Jiaotong University China School of Environment and Resource Southwest University of Science and Technology Sichuan Mianyang621010 China Key Laboratory of Materials in Dynamic Extremes Southwest Jiaotong University Chengdu610031 China

Based on the self-developed multi-mode fretting wear tester , the paper conducted dual-motion fretting wear tests on Zr-4 alloy tubes in the fuel rod section of pressurized water reactors in the nuclear industry at different temperatures (room temperature, 300 °C) and different radial alternating loads under the condition of 90° phase difference. The experimental results show that when the phase difference is 90°, different radial loads and temperatures have a significant effect on the dual-motion fretting wear characteristics of Zr-4 alloy tubes. The alternating radial load of dual-motion fretting wear test will cause the contact area of the specimen to have different fretting operation areas. © 2024, The Authors. All rights reserved.

关键词： Pressurized water reactors

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A New Method of Alkalinity Remediation for Cd-Contaminated Groundwater by Paas-Modified MgCO3/Mg(OH)2 Colloid

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SSRN 2024年

作者： Li, Bowen Tang, Meiling Wang, Peng Liu, Shibin Yao, Meng Dong, Jun State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology 1# Dongsanlu Erxianqiao Sichuan Chengdu610059 China School of Environmental Science and Engineering Changzhou University Changzhou213164 China Key Lab of Groundwater Resources and Environment Ministry of Education Jilin University Changchun130026 China

Mg(OH)2 dissolves slowly and can provide a long-term source of alkalinity, thus a promising alternative reagent for the in situ remediation of heavy metal polluted groundwater. Unfortunately, it exhibits a relatively poor stabilization effect on heavy metal Cd due to the higher solubility of the resulting stabilized product, Cd(OH)2. To overcome this limitation, we investigated the use of MgCO3/Mg(OH)2 colloid modified by sodium polyacrylate (PAAS) to remove Cd from groundwater. Through ultrasonic dispersion, the molecular chains of PAAS are broken, causing a transformation from flocculation to surface modification, resulting in the production of a stable colloid. The colloidal particles of MgCO3/Mg(OH)2 have a smaller size and a negatively charged surface, which significantly enhances their migration ability in aquifers. The combination of MgCO3 and Mg(OH)2 provides a complementary effect, where MgCO3 effectively precipitates Cd in the aquifer while Mg(OH)2 maintains the required pH level for stabilization. The optimal compounding ratio of MgCO3 to Mg(OH)2 for achieving the best stabilization effect on Cd is found to be 1:1. Column experiments demonstrate that the injection of MgCO3/Mg(OH)2 colloid substantially enhances Cd stability, reducing the exchangeable fraction of Cd in aquifer media from 88.94% to a range of 7.08-50.63%. Based on these results, the MgCO3/Mg(OH)2 colloid shows great potential as a reactive medium for remediating Cd-contaminated groundwater. © 2024, The Authors. All rights reserved.

关键词： Stabilization

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