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Surface wave inversion with unknown number of soil layers based on a hybrid learning procedure of deep learning and genetic algorithm

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Earthquake engineering and engineering Vibration 2024年第2期23卷 345-358页

作者： Zan Zhou Thomas Man-Hoi Lok Wan-Huan Zhou Department of Civil and Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina

Surface wave inversion is a key step in the application of surface waves to soil velocity ***,a common practice for the process of inversion is that the number of soil layers is assumed to be known before using heuristic search algorithms to compute the shear wave velocity profile or the number of soil layers is considered as an optimization ***,an improper selection of the number of layers may lead to an incorrect shear wave velocity *** this study,a deep learning and genetic algorithm hybrid learning procedure is proposed to perform the surface wave inversion without the need to assume the number of soil ***,a deep neural network is adapted to learn from a large number of synthetic dispersion curves for inferring the layer ***,the shear-wave velocity profile is determined by a genetic algorithm with the known layer *** applying this procedure to both simulated and real-world cases,the results indicate that the proposed method is reliable and efficient for surface wave inversion.

关键词： surface wave inversion analysis shear-wave velocity profile deep neural network genetic algorithm

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Dissolved carbon in biochar:Exploring its chemistry,iron complexing capability,toxicity in natural redox environment

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Journal of environmental sciences 2025年第1期147卷 217-229页

作者： Chaochao Lai Juhong Zhan Qiuyun Chai Changlu Wang Xiaoxia Yang Huan He Bin Huang Xuejun Pan Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Research Institute for Environmental Innovation(Suzhou)Tsinghua Suzhou 215163China

Dissolved black carbon(DBC)plays a crucial role in the migration and bioavailability of iron in ***,the properties of DBC releasing under diverse pyrolysis conditions and dissolving processes have not been systematically ***,the compositions of DBC released from biochar through redox processes dominated by bacteria and light were thoroughly *** was found that the DBC released from straw biochar possess more oxygen-containing functional groups and aromatic *** content of phenolic and carboxylic groups in DBC was increased under influence of microorganisms and light,*** concentration of phenolic hydroxyl groups increased from 10.0~57.5 mmol/gC to 6.6~65.2 mmol/gC,and the concentration of carboxyl groups increased from49.7~97.5 mmol/gC to 62.1~113.3 mmol/*** the impacts of DBC on pyrite dissolution andmicroalgae growth were also *** complexing Fe^(3+)was proved to play a predominant role in the dissolution of ferrous mineral in DBC *** to complexing between iron ion and DBC,the amount of dissolved Fe in aquatic water may rise as a result of elevated number of aromatic components with oxygen containing groups and low molecular weight generated under light ***-DBC complexations in solution significantly promoted microalga growth,which might be attributed to the stimulating effect of dissolved Fe on the chlorophyll *** results of study will deepen our understanding of the behavior and ultimate destiny of DBC released into an iron-rich environment under redox conditions.

关键词： Dissolved black carbon Bacteria Light Iron complexes Toxicity

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Estimation of maximum scour depth around bridge piers under ice-covered conditions using data-driven methods

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International Journal of Sediment Research 2023年第2期38卷 191-202页

作者： Hosein Nezaratian Amin Hassanjabbar Peng Wu Environmental Systems Engineering Faculty of Engineering and Applied Science University of Regina

The scouring around bridge foundations is a significant concern in civil engineering. Several research has been conducted experimentally and numerically to study the maximum scour depth around the foundations of a bridge in open channel conditions. In cold regions, where ice forms on lakes, reservoirs, and rivers, the interaction between ice and hydraulic structures is further complicated. The flow distribution varies significantly leading to deeper and larger scouring around bridge foundations. The present study took advantage of the data-driven methods to investigate the impacts of ice conditions to maximum scour depth. In total, 96 datasets were extracted from previous studies. The M5 decision tree, Genetic Expression Programming(GEP), and Particle Swarm Optimization(PSO) were used in data analysis. The models were developed using the train-and-test approach to avoid over-training. The mentioned developed models were further compared with a previous empirical equation associated with the prediction of maximum scour depth around piers under ice conditions. Finally, a sensitivity analysis method was applied to evaluate the performance of the data-driven models. It was found that the approaching velocity and pier diameter play the most crucial role in determination of the maximum scour depth. The result is generally in agreement with those of previous experimental studies.

关键词： Ice cover Bridge foundations Data-driven method Maximum scour depth Sensitivity analysis

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N-doped activated carbon promoting sulfur-containing VOC removal in three-dimension electrode system

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Frontiers of environmental science & engineering 2025年第5期19卷 205-218页

作者： Rui Luo Shugen Liu Senlin Tian Chen Li Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National Regional Engineering Research Center-NCW Kunming 650500China

N-doped activated carbon(AC)was employed in a three-dimensional electrode system(3DES)to enhance the removal of sulfur-containing volatile organic compounds(S-VOC).The technical parameters for preparing N-doped AC were optimized based on CS_(2)removal and COS accumulation,where the mass ratio of AC to urea was 1:1.0,and the activation temperature and heat-treatment time were 400℃and 120 min,*** the mixing S-VOC were purified under an operating voltage of 8 V and peroxydisulfate concentration of 0.15 mol/L,CS_(2)removal in the 3DES system with N-doped AC reached 100%within 75 min,and was above 83%as purification time extended to 200 ***,the COS content in the outlet gas was usually undetectable within 120 min,and was lower than that in the other electrochemical *** of raw AC through urea impregnation and subsequent heat treatment significantly improved its surface structure and pore size ***,polar functional groups,such as C=O and pyridinic-N,increased noticeably,enhancing the SVOC adsorption capacity and dielectric ***,highly reactive substances were more efficiently activated in 3DES system with N-doped AC,and oxidizing species HO·and^(1)O_(2)had important contributions to S-VOC purification compared to SO_(4)^(-)·radicals.A pathway was proposed to elucidate the transformation of sulfur-containing components,such as CH3SH and CS_(2).This study provides an efficient approach for S-VOC purification.

关键词： N-doped activated carbon Sulfur-containing VOC Three-dimensional electrode system Electrochemical oxidation

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Unravelling the nature of the active species as well as the Mn doping effect over gamma-Al_(2)O_(3) catalyst for eliminating AsH_(3) and PH_(3)

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Journal of environmental sciences 2024年第2期136卷 213-225页

作者： Bowen Xu Jiaxin Qu Xueqian Wang Langlang Wang Yu Pu Ping Ning Yibing Xie Yixing Ma Qiang Ma Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

To investigate the enhancing effect of Mn on the performance of simultaneous catalytic oxidation of AsH_(3)and PH_(3)by CuO-Al_(2)O_(3)in a reducing atmosphere under micro-oxygen conditions,Cu-Mn modifiedγ-Al_(2)O_(3)catalysts were *** characteristics of the catalysts showed that Mn reduced the crystallinity of the active CuO component,increased the number of oxygen vacancies and acidic sites on the catalyst surface,enhanced the mobility of surface oxygen,and the interaction between copper and manganese promoted the redox cycling ability of the catalysts and improved their oxidation performance,which increased the conversion frequency(TOF)by 2.54×10^(-2)to 3.07×10^(-2)sec^(-1).On the other hand,the introduction of Mn reduced the production of phosphate and As_(2)O_(3)on the catalyst surface by30.96%and 44.9%,which reduced the coverage and inerting of the active sites by phosphate and As_(2)O_(3),resulting in an 8 hr(6 hr)improvement in the stability of PH_(3)(AsH_(3))removal.

关键词： AsH_(3)-PH_(3)removal Oxygen activation Mn doping Stability enhancement

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Regulating the valence and size of the active center of Co/Al_(2)O_(3)catalyst improved the performance and selectivity of NH_(3)-SCO

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Journal of environmental sciences 2025年第4期150卷 188-201页

作者： Shengyi Wu Jiaxin Li Junjun Qiu Chunxue Wang Fei Wang Zhao Li Ping Ning Kai Li Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming 650500China

To improve the activity of Co/Al_(2)O_(3)catalysts in selective catalytic oxidation of ammonia(NH_(3)-SCO),valence state and size of active centers of Al_(2)O_(3)-supported Co catalysts were adjusted by conducting H_(2)reduction *** NH_(3)-SCO activity of the adjusted 2Co/Al_(2)O_(3)catalyst was substantially improved,outperforming other catalysts with higher *** Co/Al_(2)O_(3)catalysts exhibited multitemperature reduction processes,enabling the control of the valence state of the Co-active centers by adjusting the reduction *** in the state of the Co-active centers also led to differences in redox capacity of the catalysts,resulting in different reaction mechanisms for NH_(3)-***,in situ diffuse reflectance infrared Fourier transform spectra revealed that an excessive O_(2)activation capacity caused overoxidation of NH_(3)to NO and NO_(2).The NH_(3)-SCO activity of the 2Co/Al_(2)O_(3)catalyst with low redox capacity was successfully increased while controlling and optimizing the N_(2)selectivity by modulating the active centers via H_(2)pretreatment,which is a universalmethod used for enhancing the redox properties of ***,this method has great potential for application in the design of inexpensive and highly active catalysts.

关键词： NH_(3)-SCO Active center O_(2)activation capacity Reaction mechanism H_(2)pretreatment

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Global elevation of algal bloom frequency in large lakes over the past two decades

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National science Review 2025年第3期12卷 197-207页

作者： Ying Wang Dan Zhao R.Iestyn Woolway Haoran Yan Hans W.Paerl Yi Zheng Chunmiao Zheng Lian Feng School of Environmental Science and Engineering College of Engineering Southern University of Science and Technology School of Ocean Sciences Bangor University Faculty of Resources and Environmental Science Hubei University Institute of Marine Sciences University of North Carolina at Chapel Hill Eastern Institute for Advanced Study Eastern Institute of Technology

The recent increase in algal blooms in lakes, potentially exacerbated by climate warming, is of global concern. However, a spatially and temporally detailed characterization of algal bloom trends at a global scale has been lacking, posing challenges to definitively attribute the increase trend to warming as a primary driver. Here, we used daily MODIS satellite observations from 2003 to 2022 to analyze algal bloom trends in 1956 large freshwater lakes worldwide. Among these lakes, 620 have experienced algal bloom events in over half of the years during the past two decades, with an upward trend in bloom frequency observed in504 lakes. This trend is particularly prominent in subtropical regions and has become most pronounced after 2015. The global median annual bloom frequency has significantly increased at a rate of +1.8%/yr over the past two decades, showing a significant correlation with air temperatures（r2= 0.43, P < 0.05）.Furthermore, in 44.8% of the bloom-affected lakes, we observed a strong correlation between air temperature and bloom frequency. Our study helps clarify the factors contributing to the global expansion of algal blooms and emphasizes the urgent need to recognize and address this growing environmental challenge within the context of climate warming.

关键词： lakes algal blooms satellite observations climate warming

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Critical layer in liquid-solid system influencing the remediation of chromium using zeolite-supported sulfide nano zero-valent iron

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Journal of environmental sciences 2024年第1期135卷 232-241页

作者： Chundi Zhou Caiyun Han Nengsheng Liu Faculty of Material and Environment Guangxi University for NationalitiesNanning 530008China College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

Sulfidated nano zero-valent iron particles were immobilized on ZSM-5 zeolite(Z/S-nZⅥ)and used for hexavalent chromium(Cr(Ⅵ))*** performance of Z/S-nZⅥimproved with the increase in Cr(Ⅵ)concentration(<60 mg/L),while the performance significantly decreased for a Cr(Ⅵ)concentration of more than 60 mg/*** adsorption behavior for Cr(Ⅵ)was different from that reported in previous *** improved performance can be tailored for increasing efficiency of nano zero-valent iron(nZⅥ)corrosion,while the degree of corrosion of nZⅥwas affected by the concentration of the pollutant as discussed by kinetics,X-ray diffraction(XRD)and X-ray photoelectron spectrometer(XPS)*** experiments for the dissolution of ferrous ions and the dosage of adsorbent demonstrated that the critical layer in the liquid-solid system changed with the increase in the concentration of Cr(Ⅵ)(Cr(Ⅵ):Z/S-nZⅥ>0.6).Moreover,the removal mechanisms of Cr(Ⅵ)were elucidated through XRD,transmission electron microscopy(TEM)and XPS *** results demonstrate that the species of chromium in the critical layer changed from Cr(Ⅲ)to Cr(Ⅵ)as the concentration of chromium increased from low to ***,the critical layer was composed of Cr(Ⅵ),Fe(Ⅱ),O and H ***,the experiments of coexisting ions and aging time confirmed that Z/S-nZⅥpossessed high selectivity and stability to ensure efficiency and cost-effectiveness in practical applications.

关键词： Cr(VI) Corrosion Critical layer Selectivity Stability

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High efficiency removal of NO using waste calcium carbide slag by facile KOH modification

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Journal of environmental sciences 2024年第5期139卷 182-192页

作者： Fang Wang Hui Li Jiyun Gao Na Geng Enzhu Jiang Futing Xia Mingwu Xiang Lijuan Jia Ping Ning School of Chemistry and Environment Yunnan Minzu UniversityKunming 650504China Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China

Waste calcium carbide slags(CS),which are widely applied to desulfurisation,are not typically used in ***,to well achieve waste control by waste,a facile and highefficiency denitration strategy is developed using KOH to modify the calcium carbide slags(KCS).Various KCS samples were investigated using a series of physical and chemical *** performance test results showed that the KOH concentration and reaction temperature are the main factors affecting the denitration efficiency of KCS,and CS modified with 1.5 mol/L KOH(KCS-1.5)can achieve 100% denitration efficiency at 300℃.Such excellent removal efficiency is due to the catalytic oxidation of the oxygen-containing functional groups derived from the *** studies showed that KOH treatment significantly increased the concentration of oxygen vacancies,nitro compounds,and basic sites of *** study provides a novel strategy for the resource utilisation of waste CS in the future.

关键词： Waste Carbide slag KOH Effective denitration

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Effect of Cu/HZSM-5 sorbents with different Si/Al ratios on the adsorption and oxidation performance of H_(2)S

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Journal of environmental sciences 2025年第5期151卷 161-173页

作者： Kaini Ma Kai Li Ping Ning Jiayu Feng Jiacheng Bao Lei Shi Xiangyu Wang Xin Sun Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China

This study employed a wet impregnation method to synthesize five types of Cu/HZSM-5 adsorbents with Si/Al ratios of 25,50,85,200,and 300,used for the removal of H_(2)S in lowtemperature,low-oxygen *** impact of different Si/Al ratios on the adsorption oxidative performance of Cu_(30)/HZSM-5–85 adsorbents was *** to the performance test results,Cu_(30)/HZSM-5–85 exhibited the highest breakthrough capacity,reaching 231.75 mg H_(2)S/g_(sorbent).Cu/HZSM-5 sorbent maintains a strong ability to remove H_(2)S even under humid conditions and shows excellent water ***,BET,and XPS results revealed that CuO is the primary active species,with Cu_(30)/HZSM-5–85 having the largest surface area and highest CuO content,providing more active sites for H_(2)S adsorption.H_(2)-TPR and O_(2)-TPD results confirmed that Cu_(30)/HZSM-5–85 sorbent exhibits outstanding redox properties and oxygen storage capacity,contributing to excellent oxygen transferability in the molecular sieve adsorption-oxidation *** notable characteristics such as a large surface area,high desulfurization efficiency,and water resistance,Cu_(30)/HZSM-5–85 sorbents hold significant importance for industrial applications.

关键词： H_(2)S Si/Al ratio Adoration-oxidation Cu/HZSM-5-85(HZSM-5 with Si/Al ratio of 85 loaded Cu)

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