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SSRN 2024年

作者： Huang, Fuyun Gao, Yuan Hu, Bill Xiaonong Wang, Xiaoguang Pu, Shengyan School of Geology and Mining Engineering Xinjiang University Xinjiang Urumqi830046 China School of Water Conservancy and Environment University of Jinan Shandong Jinan250022 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Sichuan Chengdu610059 China Tianfu Yongxing Laboratory Sichuan Chengdu610059 China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Sichuan Chengdu610059 China

Precipitation infiltration recharge can influence the interaction process between the karst aquifer system (KAS) and adjacent river. However, the interaction mechanism between various media of the KAS and adjacent river is currently still unclear, and characterizing the impact of dynamic saturation process of groundwater in the various media of the KAS on the interaction process remains a challenge. To delve into the impacts of varying precipitation intensities, different water retention models, multi-stage conduit arrangements, and multiple precipitation events on the interaction process between the KAS and adjacent river, this study employs the multiphase Darcy-Brinkman-Stokes (DBS) equation to analyze the interaction process between the KAS and adjacent river, the Volume of Fluid (VOF) method to capture the dynamic changes in saturation levels of various media, and the Brooks-Corey (BC) and van Genuchten-Mualem (VGM) equations to characterize the soil-properties of porous media. The results show that as the intensity of precipitation increases, the interaction process between the KAS and adjacent river becomes more complex, involving the synergistic recharge of multi-media and dynamic interactions with the KAS. The discharges of the upper porous medium (PM Ⅰ) and the lower porous medium (PM Ⅱ) increases with the increase in precipitation intensity, but the increase in PM Ⅱ is more significant, and the peak of discharge occurs earlier. Secondly, the impact of different water retention models on the interaction process is quite significant. It is found that during the middle to late stages of precipitation, the discharge predicted by the BC model exceeds that of the VGM model. The arrangement of multi-stage conduit can significantly influence the hydrological processes of the river and the karst conduit under specific conditions, especially during heavy precipitation, but have a less impact on other media. Finally, for multiple precipitation events, when the precip

关键词： Rivers

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Bi-layered collagen-based scaffolds via a universally synergistic strategy of non-equilibrium LLPS and freeze casting: Freezing-While-Lifting

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Chemical engineering Journal 2025年 515卷

作者： Liang, Kaiwen Ding, Cuicui Li, Xiao Yu, Jingjing Cheng, Kuan Chen, Lihui Wu, Hui Zhang, Min College of Material Engineering Fujian Agriculture and Forestry University Fuzhou350002 China College of Ecological Environment and Urban Construction Fujian University of Technology Fuzhou350118 China National Forestry & Grassland Administration Key Laboratory for Plant Fiber Functional Materials Fuzhou350002 China

The demand for biomaterials with bi- or multi-layered structures, such as cartilage scaffolds, bionic skin, and asymmetrical Janus repair patches, is rapidly increasing. However, existing manufacturing methods face challenges in simultaneously fabricating bilayer structures and ensuring strong interfacial bonding. Here, we present a synergistic strategy, "Freezing-While-Lifting" (FWL), for fabricating bi-layered materials without the need for external adhesives. Inspired by natural non-equilibrium liquid–liquid phase separation (LLPS) observed in river-sea junctions, FWL is synchronously accomplished by using a baffle to regulate the coupling process between non-equilibrium LLPS and freeze casting. Using collagen as a model material, we demonstrate the versatility and stability of FWL in producing bi-layered scaffolds. This approach is also applicable to common water-soluble polymers (such as PVA, PEG, and CMCS) and even oil-in-water collagen Pickering emulsions. Our results highlight that FWL provides a controllable platform for advanced bilayer material design, overcoming challenges in layer integration and offering new insights for the development of functional biomaterials. © 2025 Elsevier B.V.

关键词： Glues

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A method for identifying transmission line faults based on deep learning

A method for identifying transmission line faults based on d...

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Chinese Automation Congress (CAC)

作者： Mingtao Li Chengtao Cai Yao Sun College of Intelligent Systems Science and Engineering Harbin Engineering University Harbin China Heilongjiang Provincial Key Laboratory of Environment Intelligent Perception Harbin China Ministry of Education Key Laboratory of Intelligent Technology and Application of Marine Equipment Harbin Engineering University Harbin China

For the problem of transmission line faults identification, the traditional method has shortcomings in fault judgment and classification. Meanwhile, the traditional method has poor identification efficiency and cannot achieve the rapid inspection of long-distance transmission lines. Using drone to inspect transmission wires, a method of identifying transmission line faults based on the deep learning algorithm YOLOv5 is proposed, which further improves the accuracy of transmission line faults identification in complex backgrounds. The experiments prove that compared with the traditional method, this method has the characteristics of higher detection efficiency, better fault judgment ability and environmental robustness, which can meet the requirements of fast and efficient fault detection.

关键词： Fault diagnosis Deep learning Training Power transmission lines Wires Interference Robustness

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New Insight into the Effect of Microplastics on Antibiotic Resistance and Bacterial Community of Biofilm

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SSRN 2023年

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) can be the substrate of microbial colonization and form biofilm. However, the studies concentrate on the effects of different kinds of microplastics and natural substrates on biofilm formation and community structure in the presence of antibiotic-resistant bacteria (ARB) is less. In this study, based on a controlled environment, the situation of biofilms conditions, bacterial resistance pattern, antibiotic resistance genes (ARGs) distribution, and microbial community on different substrates were analyzed by microbial cultivation, 16S rRNA gene sequencing and PCR. The biofilms on different substrates markedly increased with time, and MPs surfaces formed more biofilm than stone. Antibiotic resistant analysis indicated that there were exhibited negligible effects in the resistance rate to the same antibiotic at 30d, but tetB would be selectively enriched on two MPs. The microbial communities on MPs and stone varied in different biofilm formation periods, WPS-2 and Epsilonbacteraeot were identified as the dominant microbiome of the MPs and stone-associated biofilms in 30d, respectively. Correlation analysis found that WPS-2 could be a potential tetracycline-resistant bacteria, while Epsilonbacteraeot does not correlate with any detected ARB. Our results highlight the potential threat caused by MPs as the attachment carrier of bacteria, especially antibiotic-resistant bacteria, in the aquatic environment. © 2023, The Authors. All rights reserved.

关键词： Biofilms

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Enhanced Low-Temperature Nh3-Scr Performance by G-C3n4 Modified Ce-Oms-2 Catalyst

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SSRN 2023年

作者： Wang, Xinpeng Qu, Chao Liu, Wenyi Meng, Fanwei Yang, Fan Zhang, Xin Ye, Qing Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing100124 China State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum Beijing102249 China

The xCN/Ce-OMS-2 (x is the nominal weight percentages of g-C3N4, x = 5.0, 10.0, and 15.0 wt%) catalysts were prepared via an in-situ synthesis method. Physicochemical properties of the as-prepared materials were measured by means of the XRD, TEM, SEM, BET, XPS, H2-TPR, NH3-TPD, and in-situ DRIFTS techniques, and their catalytic activities for the selective catalytic reduction of NOx with NH3 (NH3-SCR) at low temperatures were evaluated. Among all the catalysts, the 10CN/Ce-OMS-2 catalyst showed the widest temperature span for NH3-SCR reaction and the best resistance to SO2 poisoning. This may result from that the modification of g-C3N4 promoted the electron transfer in catalyst, not only increased the concentration of active Mn4+ species and chemisorbed oxygen species, but also improved the surface acidity of the catalyst. In-situ DRIFTS results further showed that the modification of g-C3N4 increased the amount of acid sites and enhanced the formation of NH3 or NO intermediates (i.e., monodentate and bidentate nitrate), which enhanced the reaction activity of the catalyst. © 2023, The Authors. All rights reserved.

关键词： Cerium oxide

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Synthesis,microstructure,and properties of high purity Mo_(2)TiAlC_(2) ceramics fabricated by spark plasma sintering

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Journal of Advanced Ceramics 2020年第6期9卷 759-768页

作者： Yunhui NIU Shuai FU Kuibao ZHANG Bo DAI Haibin ZHANG Salvatore GRASSO Chunfeng HU State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

The synthesis,microstructure,and properties of high purity dense bulk Mo_(2)TiAlC_(2) ceramics were *** purity Mo_(2)TiAlC_(2) powder was synthesized at 1873 K starting from Mo,Ti,Al,and graphite powders with a molar ratio of 2:1:1.25:*** synthesis mechanism of Mo_(2)TiAlC_(2) was explored by analyzing the compositions of samples sintered at different *** was found that the Mo_(2)TiAlC_(2) phase was formed from the reaction among Mo3Al2C,Mo2C,TiC,and *** Mo_(2)TiAlC_(2) bulk sample was prepared by spark plasma sintering(SPS)at 1673 K under a pressure of 40 *** relative density of the dense sample was 98.3%.The mean grain size was 3.5μm in length and 1.5μm in *** typical layered structure could be clearly *** electrical conductivity of Mo_(2)TiAlC_(2) ceramic measured at the temperature range of 2-300 K decreased from 0.95×10^(6) to 0.77×10^(6)Ω^(-1)·m^(-1).Thermal conductivity measured at the temperature range of 300-1273 K decreased from 8.0 to 6.4 W·(m·K)^(-1).The thermal expansion coefficient(TEC)of Mo_(2)TiAlC_(2) measured at the temperature of 350-1100 K was calculated as 9.0×10^(-6) K^(-1).Additionally,the layered structure and fine grain size benefited for excellent mechanical properties of low intrinsic Vickers hardness of 5.2 GPa,high flexural strength of 407.9 MPa,high fracture toughness of 6.5 MPa·m^(1/2),and high compressive strength of 1079 *** at the indentation load of 300 N,the residual flexural strength could hold 84% of the value of undamaged one,indicating remarkable damage ***,it was confirmed that Mo_(2)TiAlC_(2) ceramic had a good oxidation resistance below 1200 K in the air.

关键词： MAX phase Mo_(2)TiAlC_(2) synthesis microstructure properties

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Drivers of PM2.5-O3 co-pollution:from the perspective of reactive nitrogen conversion pathways in atmospheric nitrogen cycling

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Science Bulletin 2022年第18期67卷 1833-1836页

作者： Feng Wang Weichao Wang Zhenyu Wang Zhongcheng Zhang Yinchang Feng Armistead G.Russell Guoliang Shi State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control Tianjin Key Laboratory of Urban Transport Emission ResearchCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China China Meteorological Administration-Nankai University(CMA-NKU)Cooperative Laboratory for Atmospheric Environment-Health Research College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology Nankai UniversityTianjin 300071China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlanta GA 30332-0512USA

Fine particulate matter(PM)and ozone(O),two globally signifcant air pollutants,have exerted substantial adverse impacts on climate and human health[1].From 2013 to 2020,China has achieved a signifcant decline of PMlevels,though O3pollution has deteriorated over time[2].PM-Oco-pollution includes not only both high levels of PMand O,but also high PMor Oeven when the other remain ***,the coordinated control of PMand Oshould not only focus on reducing high concentrations of PMand Osimultaneously.

关键词：活性氮转化途径 PM 驱动因素

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A Complete Path Model for the Carbon Emission Prediction of Urban District Heating Based on System Dynamics

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SSRN 2023年

作者： Wei, Cun Zhou, Zhigang Zheng, Jinfu Wang, Ruixin Cong, Mingyang Yang, Dayi Liu, Jing School of Architecture Harbin Institute of Technology Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology Harbin China School of Environmental and Municipal Engineering Qingdao University of Technology Qingdao China Faculty of Computing Harbin Institute of Technology Harbin China

High-carbon-emission heating technologies are unsustainable;thus, district heating with low carbon emissions is a crucial alternative for decarbonizing the heating sector. Early studies have frequently demonstrated the impact of one or more variables on carbon emissions;however, they have frequently disregarded the integrity, dynamism, and complexity of different urban heating subsystems. This study constructed a complete method with high flexibility and applicability to predict carbon emissions from urban district heating based on system dynamics. This study identified the main factors affecting carbon emissions from the building, heating, and power subsystems. Each subsystem was assigned to one of three development models: high, medium, or low. There were 27 scenarios, and the objectives and tasks of each scenario were suggested separately based on the development models. Then, the carbon emissions from urban district heating over the next 40 years (2020–2060) in Heilongjiang Province were simulated. The research results show that urban heating carbon emissions can be effectively reduced by at least 60% compared to 2020 in the low-speed scenario, and by up to 80% or more in the case of the high-speed scenario by 2060, in combination with China's current policies. © 2023, The Authors. All rights reserved.

关键词： District heating

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Integrated Modeling of Fully Coupled Two-Phase Surface and Subsurface Flow 1

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16th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2021

作者： Zhu, Yulong Ishikawa, Tatsuya Subramanian, Srikrishnan Siva Department of Field Engineering for the Environment Hokkaido University Kita 13 Nishi 8 Kita-Ku Sapporo060-8628 Japan State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection Chengdu University of Technology Chenghua Chengdu610059 China

ISBN: (数字)9783030645144

ISBN: (纸本)9783030645137

An integrated model of fully coupled two-phase surface and subsurface flow was built by using GETFLOWS (GEneral purpose Terrestrial fluid-FLOW Simulator), a finite difference fluid-flow numerical simulator, to perform quantitative evaluation of exchange of overland water and groundwater, subsurface seepage and surface water runoff on the hillside slope surface. Surface water on hillside slope was modeled as open-channel flows and coupled with air-water two phase Darcy flow for underground permeation by using a generalized flow formula. In this study, a simple verification model was firstly built and validated by the extensively used Abdul and Gillham example with simulating the coupled surface and subsurface flow. Then a three-dimensional integrated model of surface and subsurface flow was built by using the DEM (Digital Elevation Model) of a natural mountain slope in Hokkaido, Japan, where runoff induced several debris flows and slope failures occurred during Typhoon 10 hit Hokkaido in 2016. Finally the results of integrated simulation was compared with the results from two-dimensional (2D) impermeable plane flow simulation using Nays2D Flood solver of the iRIC software in the same region. The results suggest that on the hillside slope upstream of embankment, the infiltration rate is equals to the rainfall intensity at the beginning of the rainfall event. After the rainfall intensity is greater than the soil infiltration capacity, runoff is generated. The runoff from upstream allows more water to infiltrate into the embankment causing the possibility of slope failure at the exit of the valley to be much greater than other locations along the highway. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Runoff

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Cadmium accumulation potential and detoxication mechanism of Koenigia tortuosa: A novel extremely hardy plant from high altitude lead-zinc mine in Qinghai-Tibet Plateau

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Chemosphere 2025年 372卷 144112页

作者： Hu, Junqi Wu, Bin Peng, Fengge Duo, Ji Huang, Yi Zheng, Shuai Zheng, Qingjuan State Key Laboratory of Geohazard Prevention and Geoenvironment Protection College of Ecology and Environment Chengdu University of Technology Chengdu610059 China Agricultural and Livestock Products Engineering Technology Research Center of XIZANG Autonomous Region Institute of Agricultural Quality Standard and Testing XIZANG Academy of Agricultural and Animal Husbandry Sciences XIZANG Lhasa850032 China Tibet University Lhasa850000 China

Hardy plants play a crucial role in restoring high-altitude tailings ponds, but the accumulation of potentially toxic elements (PTEs) and detoxification mechanisms in alpine plants are understudied. This study first investigated the cadmium (Cd) accumulation capacity and detoxification mechanisms by comparative transcriptomics with different Cd stress (0, 5, 10, 20 and 40 mg L−1 Cd2+) of Koenigia tortuosa from a lead-zinc mine (4950 m above sea level) in Qinghai-Tibet Plateau. The findings revealed that, despite elevated Cd concentrations suppressed the growth of Koenigia tortuosa, the plant retained a notable ability to accumulate Cd. The content of soluble protein and antioxidant enzyme activities increased with the concentration of Cd from 5 mg L−1 to 20 mg L−1, and then decreased when the concentration of Cd increased to 40 mg L−1. The maximum Cd accumulation in roots was 269.44 mg kg−1 at the 20 mg L−1 Cd concentration, with 61.83% of Cd extracted by NaCl. In addition, transcriptome analysis showed that differentially expressed genes (DEGs) were mainly distributed in the nucleotide metabolism, oxidative phosphorylation pathway, glutathione metabolism and plant signaling, which were significantly up-regulated in ribosomal protein genes, translational factor genes and glutathione-related genes. These results will contribute to revealing the physiological response and molecular mechanism of Cd tolerance in Koenigia tortuosa, supporting the ecological remediation of Cd contaminated sites in high-altitude mining areas. © 2025 Elsevier Ltd

关键词： Plant diseases

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