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Critical role of vegetation and human activity indicators in the prediction of shallow groundwater quality distribution in Jianghan Plain with LightGBM algorithm and SHAP analysis

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Chemosphere 2025年 376卷 144278页

作者： Xiong, Hanxiang Wang, Jinghan Yang, Chi Li, Shuyi Li, Xiaobo Xiong, Ruihan Wang, Yuzhou Ma, Chuanming School of Environmental Studies China University of Geosciences Wuhan430074 China School of Energy Science and Engineering Central South University Changsha410083 China Shandong Fifth Institute of Geology and Mineral Exploration Tai'an250013 China State Key Laboratory of Geomicrobiology and Environmental Changes China University of Geosciences Wuhan430078 China Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo315200 China School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

Groundwater serves as an indispensable resource for freshwater, but its quality has experienced a notable decline over recent decades. Spatial prediction of groundwater quality (GWQ) can effectively assist managers in groundwater remediation, management, and risk control. Based on the traditional intrinsic groundwater vulnerability (IGV) model (DRASTIC) and three vegetation (V) indicators (NDVI, EVI, and kNDVI) and four human activity (H) indicators (land use, GDP, urbanization index, and nighttime light), we constructed four models for GWQ spatial prediction in the Jianghan Plain (JHP), namely DRASTI, DRASTIH, DRASTIV, and DRASTIVH, excluding the conductivity (C) indicator due to its uniformly low values. LightGBM algorithm, Tree-structured Parzen Estimator (TPE) optimization method, and SHapley Additive exPlanations (SHAP) analysis are used for model setting, calibration, and interpretation, respectively. The results show that nitrogen-related GWQ parameters have higher weights, and the model performs exceptionally well when considering all the indicators (accuracy = 0.840, precision = 0.824, recall = 0.832, F1 score = 0.828, AUROC = 0.914). Notably, the introduced indicators (NDVI, EVI, kNDVI, nighttime light, GDP, and urbanization index) rank as the top six in terms of importance, while traditional DRASTI and land use indicators show lower significance. Based on SHAP analysis, poor GWQ primarily occurs in areas with either extremely high or extremely low GDP and urbanization index values, and human activities are the primary cause of poor GWQ in JHP, potentially involving urbanization, industrial and agricultural activities, as well as fertilizer usage. Finally, the methodological framework proposed in this study is encouraged to be applied to diverse regions, such as plains, karst areas, mountainous regions, and coastal areas, to support effective future groundwater management. © 2025 Elsevier Ltd

关键词： Quality management

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Experimental Investigation and Strength Model of Rough Ice-Filled Joints Under Tensile and Shear Loading

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SSRN 2023年

作者： Huang, Shibing Liu, Gang Liu, Fei Xin, Zekun Cai, Haowei School of Resources and Environmental Engineering Wuhan University of Science and Technology Hubei Wuhan430081 China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan University of Science and Technology Hubei Wuhan430081 China Wuhan University of Science and Technology China

With global warming and the increase of human activities in cold regions, the mechanical strength loss of ice-filled joints has caused many rockfall disasters of alpine joint slope. A series tensile and shear strength tests of ice-filled joints were conducted to investigate the thawing softening mechanism of permafrost joints by considering the joint opening, roughness and temperature. The test results show that the joint opening has little influence on the tensile strength of the joint, but the temperature is a remarkable factor. When the temperature increases from -15 °C to -0.5 °C, the average tensile strength of ice-filled joint reduces from 0.64 MPa to 0.22 MPa. The variation rule of tensile strength for ice-filled joints is very similar to that of pure ice, which displays a constant logarithmic decay against the temperature. The shear strength of the ice-filled joint is influenced by the infilling thickness. The shear strength of ice-filled joint decreases with increasing the infill thickness of joint ice, and it tends to be the shear strength of pure ice when beyond the critical infilling thickness. In addition, the tensile failure still happens inside the joint ice while the shear failure is mainly caused by the debonding of ice-rock interface, when the temperature increases to -0.5 °C. It implies that the tensile bonding strength of ice-rock interface also is larger than that of the solid ice itself even at a high freezing temperature. Based on the experimental results, a new shear strength model of the ice-filled joint is proposed for Barton’s joint profiles by considering the effect of temperature and infill thickness. It has been validated that this model is accurate to predict the shear strength of ice-filled joint, which may be used to estimate the stability of freezing joint rock slope in cold regions. © 2023, The Authors. All rights reserved.

关键词： Ice

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Insights into in Situ Surface Reconstruction in Cobalt Perovskite Oxides for Enhanced Catalytic Activity

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SSRN 2024年

作者： Jin, Yanyu Cheng, Hongjun Wang, Qibao Liu, Xiaoqing Mo, Shengpeng Zhou, Bin Peng, Yue Wang, Yu Si, Wenzhe Li, Junhua School of Environmental Science and Engineering Yancheng Institute of Technology Yancheng224051 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China School of Environment and Safety Engineering North University of China Taiyuan030051 China School of Chemical & Environmental Engineering China University of Mining and Technology Beijing100084 China

An depth understanding of the fundamental interactions between surface termination and catalytic activity is crucial to prompt the properties of functional perovskite materials. The elastic energy due to size mismatch and electrostatic attraction of the charged Sr dopant by positively charged oxygen vacancies induced inert A-site surface enrichment rearrangement for perovskites . Lower temperatures could reduce A-site enrichment, but it is difficult to form perovskite crystals. La0.8Sr0.2CoO3-δ (LSCO) as a model perovskite oxide was modified with additive urea to reduce the crystallization temperature, and suppress Sr segregation. The LSCO catalysts with 600°C annealing temperature (LSCO-600) exhibited a 19.4-fold reaction reactivity of toluene oxidation than that with 800°C annealing temperature (LSCO-800). Combined surface-sensitive and depth-resolved techniques for surface and sub-surface analysis, surface Sr enrichment was effectively suppressed due to decreased oxygen vacancy concentration and smaller electrostatic driving force. DFT calculations and in-situ DRIFTS spectra well reveal that tuning the surface composition/termination affects the intrinsic reactivity. The catalyst surface with lower Sr enrichment could easily adsorb toluene, cleave, and decompose benzene rings, thus contributing to toluene degradation to CO2. This work demonstrates a green and efficient way to control surface composition and termination at the atomic scale for higher catalytic activity. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Synergistic Effect of Binary Mixture of Anionic Nonionic Surfactant on Inhibiting Coal Dust Pollution: Experiment and Simulation

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SSRN 2023年

作者： Nie, Wen Tian, Qifan Niu, Wenjin Li, Ruoxi Bao, Qiu Zhang, Xiaohan Yan, Xiao Lian, Jie College of Safety and Environmental Engineering Shandong University of Science and Technology Shandong Province Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China

Coal dust is a pollutant particle generated during the process of coal development and utilization. It can cause damage to the surrounding environment and human health. In this paper, experimental and molecular dynamics simulations were used to select four surfactants: fatty alcohol polyoxyethylene ether sodium sulfate (AES), sodium dodecyl benzene sulfonate (SDBS), lauryl glucoside (APG-12), and fatty alcohol polyoxyethylene ether (AEO-9). The wettability and adsorption ability of a single surfactant and a combination of surfactants were studied at the macro and micro levels, Laying a foundation for the preparation of binary surfactants. The results show that the anionic nonionic binary composite aqueous solution of 0.07% SDBS and 0.05% AEO-9 can greatly increase the content of hydrophilic functional groups in coal molecules, and its hydrophobic groups can be firmly adsorbed on the pore size of coal dust, effectively solving the problem of poor hydrophilicity and difficult wetting of coal dust. In addition, on the basis of quantitative characterization of micromolecules and macro wetting test, research on foam characteristics has been added to further improve dust suppression efficiency and effectively control air pollution caused by coal mining and use. © 2023, The Authors. All rights reserved.

关键词： Air pollution

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Profoundly entwined ecosystem services,land-use change and human well-being into sustainability management in Yushu,Qinghai-Tibet Plateau

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Journal of Geographical sciences 2022年第9期32卷 1745-1765页

作者： LIU Mengxue GAO Ya WEI Hejie DONG Xiaobin ZHAO Bingyu WANG Xue-Chao ZHANG Peng LIU Ranran ZU Xinyu State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing100875China Beijing Normal University Beijing100875China College of Resources Science and Technology Beijing Normal UniversityBeijing100875China College of Resources and Environmental Sciences Henan Agricultural UniversityZhengzhou450002China School of Information Engineering China University of GeosciencesBeijing100083China

The nexus exploration among land use/land cover change,ecosystem services and human well-being has been increasingly crucial in the context of Future ***,the spatial heterogeneity and the entwining process among these three aspects have not yet been in-depth and systematically *** we identified the spatiotemporal pattern of ecosystem services during the past 20 years in Yushu,the eco-fragile region and the centre of Qinghai-Tibet Plateau,as well as clarified its relationships with land use change and human *** revealed that:(1)The structure of the ecosystem and land use in this area have been increasingly stable,and the ecological projects have exerted a positive impact.(2)Although the ecological environmental issues still need more attention,the ecosystem services of the area have been positively developing.(3)Derived by the ecosystem services increase,environmental projects and policies,the human well-beings of culture and education performed much better than other aspects.(4)It is crucial to carry out long-term ecological projects and increase educational investment for maintaining the stability of this ecologically fragile *** study provides significant support for the regional ecological sustainability decision making,especially for the Qinghai-Tibet Plateau,the roof of the world.

关键词： eco-fragile region Land use/land cover change ecosystem services human well-being Qinghai-Tibet Plateau

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Impacts of El Ni?o-Southern Oscillation on global fire PM2.5 during 2000-2023

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Atmospheric and Oceanic science Letters 2025年第3期 61-67页

作者： Yonghang Hu Xu Yue Chenguang Tian Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science & Technology (NUIST)

厄尔尼诺-南方涛动（ENSO）是全球气候变化的主要驱动因素,对区域火灾活动及其相关污染物排放有深远影响.本研究分析了2000-2023年期间ENSO对全球火灾排放及火灾引起的PM2.5浓度的影响.在厄尔尼诺事件期间,由于异常增温和降水不足,全球... 详细信息

厄尔尼诺-南方涛动（ENSO）是全球气候变化的主要驱动因素,对区域火灾活动及其相关污染物排放有深远影响.本研究分析了2000-2023年期间ENSO对全球火灾排放及火灾引起的PM2.5浓度的影响.在厄尔尼诺事件期间,由于异常增温和降水不足,全球火灾排放增加5.9%-20.0%,其中印度尼西亚,北美和澳大利亚为火排放增幅最显著地区.相比之下,拉尼娜事件期间全球火灾排放减少3.2%-9.9%,具体变化取决于所使用的火灾排放清单.在此背景下,火灾引起的PM2.5浓度在厄尔尼诺事件期间显著增加,印度尼西亚增加27.5%-71.0%,北美增加49.2%-116.5%,澳大利亚增加17.5%-42.6%;而在拉尼娜事件期间,这些地区的PM2.5浓度分别减少26.6%-52.5%,19.4%-37.3%和14.5%-24.4%.研究结果表明,ENSO从区域到全球尺度上深刻影响着火排放和空气污染物浓度,相关结论为减缓极端气候事件对空气质量的影响提供了重要的科学依据.

关键词：厄尔尼诺-南方涛动气候变化野火 PM＿(2.5)

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Elastic instability analysis of functionally graded nanoplates under nonlinear coupling loads on a shear elastic foundation via non-local theory

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Geomechanics and engineering 2025年第5期41卷 507-525页

作者： Benachi, Hayat Menasria, Abderrahmane Bouhadra, Abdelhakim Chitour, Mourad Rachedi, Mohamed Ali Mamen, Belgacem Tounsi, Abdelouahed Department of Civil Engineering Faculty of Science and Technology Abbès Laghrour University Khenchela Algeria Laboratoire d'Ingénierie et Sciences des Matériaux Avancés Abbès Laghrour University Khenchela Algeria Material and Hydrology Laboratory University of Sidi Bel Abbes Faculty of Technology Civil Engineering Department Algeria Department of Mechanic Engineering Faculty of Science and Technology Abbès Laghrour University Khenchela Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum & Minerals Eastern Province Dhahran31261 Saudi Arabia

Nanostructures are generally used in environments where they can be subjected to different types of loading;understanding and determining their reaction to a hygro-thermo-mechanical environment is crucial for their design. This analysis's main objective is to evaluate the buckling sensitivity of sandwich nanoplates of FGMs subjected to a hygro-thermomechanical loading while resting on a two-parameter elastic medium. To accomplish this investigation, a quasi-3D high-shear deformation theory involving five variables containing integral terms, including the nonlocal elasticity theory of Eringen, is used. The assumed sandwich nanoplate is placed on an elastic medium, submitted to multiple boundary conditions, and subjected to a hygro-thermo-mechanical stress. The sandwich nameplate’s material properties are intended to be continuously graded across its whole thickness. An elastic foundation with two parameters is used to model the elastic environment. The equilibrium equations are constructed using the concept of virtual displacements, and the solution is displayed for several boundary conditions. The obtained outcomes are approved and validated by comparison with those found by other scholars discussing the same topic in the literature. The impact and influence of various parameters on the stability of FGM sandwich nanoplates in a hygro-thermomechanical situation are investigated through the intermediary of parametric analysis. © 2025 Techno-Press, Ltd.

关键词： Nanostructures

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Synergistic Effect of Expansive Agent and Internal Curing on the Performance of Uhpc

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SSRN 2025年

作者： Tan, Weibo Xu, Ying Zhou, Tao Qian, Xinliang Chen, Peiyuan Liu, Qinghua Wang, Jialai School of Civil Engineering and Architecture Anhui University of Science and Technology Anhui Huainan232001 China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Technology Anhui Huainan232001 China Department of Civil Construction and Environmental Engineering The University of Alabama TuscaloosaAL35487 United States

The challenge of autogenous shrinkage in ultra-high performance concrete (UHPC) arises from the scarcity of expansive hydration products and insufficient water for cement hydration, which jeopardize structural stability. This study investigates a novel approach that combines expansive agent (EA) with water-saturated perforated cenospheres (WPCs) to mitigate this issue. Individually, increasing EA dosage reduces autogenous shrinkage but negatively impacts compressive strength due to accelerated water consumption. Meanwhile, WPCs as internal water reservoirs, enhancing hydration. When used together, these materials exhibit a synergistic effect, reducing autogenous shrinkage to below 100 μΕ and maintaining compressive strength comparable to the control sample. The additional water from WPCs can mitigate the quick drop in internal relative humidity (IRH) caused by EAs, promoting expansive product formation and mitigating shrinkage. This study highlights the effectiveness of combining EAs and WPCs to enhance UHPC performance by simultaneously addressing shrinkage and strength retention. © 2025, The Authors. All rights reserved.

关键词： Ultra-high performance concrete

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Pore Space Optimization of Hybrid Ultramicroporous Material for Exceptional One-Step C2H4 Purification from C2H2/CO2/C2H4 Mixture

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SSRN 2025年

作者： Nie, Hong-Xiang Chen, Hong-Wei Wang, Ting Huang, Hongliang Gao, Qiang Yu, Mei-Hui Zhu, Jian Li, Li-Bo Zhang, Zhenjie Chang, Ze Bu, Xian-He School of Materials Science and Engineering Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry Nankai University Tianjin300350 China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization College of Chemical Engineering and Technology Taiyuan University of Technology Taiyuan030024 China College of Chemistry Nankai University Tianjin300071 China State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin300387 China College of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang212100 China

Ethylene (C2H4) is one of the largest volume products of the chemical industry. Whereas a one-step C2H4 purification process using a physisorbent is desirable and much progress has been made in terms of C2H2 and CO2 selective sorbents, very few sorbents offer both high uptake and selective adsorption for both CO2 and C2H2 over C2H4. Here, pore engineering of hybrid ultramicroporous materials (HUMs) was performed through tuning of the organic linkers to enable one-step production of high-purity (>99.95 %) C2H4. Specifically, [Ni(TPE)SiF6]n (SIFSIX-TPE-Ni, TPE = 1,1,2,2-tera(pyridin-4-yl)ethene) was found to exhibit high C2H2 (5.12 mmol/g) and CO2 (2.84 mmol/g) uptake compared to C2H4 (1.46 mmol/g) at 100 kPa and 298 K. Accordingly, the separation selectivity of SIFSIX-TPE-Ni for C2H2/C2H4 (556 for 1/99 mixture) and CO2/C2H4 (7.3 for 50/50 mixture) was enhanced by 66 and 3 times, respectively, compared to its isostructural parent [Zn(TPB)(SiF6)]n (SIFSIX-22-Zn, TPB = 1,2,4,5-tetra(pyridin-4-yl)benzene) at 100 kPa and 298 K. We attribute this performance to the confined pore environment with strong electrostatics from -F moieties that serve as nanotraps for both C2H2 and CO2 binding. SIFSIX-TPE-Ni efficiently produces polymer-grade C2H4 from a ternary mixture of C2H2/CO2/C2H4 (1/9/90, v/v/v) in a one-step, and its separation performance is far superior to that of the currently reported materials. This work further supports the pore engineering approach to systematic optimization of ultramicroporous adsorbents for challenging multi-component gas separation. © 2025, The Authors. All rights reserved.

关键词： Chemical industry

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New insight into the effect of microplastics on antibiotic resistance and bacterial community of biofilm

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Chemosphere 2023年第1期335卷 139151页

作者： Li, Yong-Qiang Zhang, Chong-Miao Yuan, Qiao-Qiao Wu, Kai School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an710055 China Key Lab of Northwest Water Resource Environment and Ecology Ministry of Education Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture and Technology Xi'an710055 China International Science and Technology Cooperation Center for Urban Alternative Water Resources Development Xi'an University of Architecture and Technology Xi'an710055 China

Microplastics (MPs) could serve as substrates for microbial colonization and biofilm formation. However, research on the effects of different types of microplastics and natural substrates on biofilm formation and community structure in the presence of antibiotic-resistant bacteria (ARB) is limited. In this study, we employed by means of microcosm experiments to analyze the situation of biofilms conditions, bacterial resistance patterns, antibiotic resistance genes (ARGs) distribution, and bacterial community on different substrates using microbial cultivation, high throughtput sequencing and PCR. The result showed that biofilms on different substrates markedly increased with time, with MPs surfaces formed more biofilm than stone. Analyses of antibiotic resistant showed negligible differences in the resistance rate to the same antibiotic at 30 d, but tetB would be selectively enriched on PP and PET. The microbial communities associated with biofilms on MPs and stones exhibited variations during different stages of formation. Notably, phylum WPS-2 and Epsilonbacteraeota were identified as the dominant microbiomes of biofilms on MPs and stones at 30 d, respectively. Correlation analysis suggested that WPS-2 could potentially be a tetracycline-resistant bacterium, while Epsilonbacteraeota did not correlate with any detected ARB. Our results emphasized the potential threat posed by MPs as attachment carriers for bacteria, particularly ARB, in aquatic environments. © 2023 Elsevier Ltd

关键词： Biofilms

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