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Three Gorges Dam: friend or foe of riverine greenhouse gases?

National Science Review 2022年第6期9卷 81-89页

作者： Jinren Ni Haizhen Wang Tao Ma Rong Huang Philippe Ciais Zhe Li Yao Yue Jinfeng Chen Bin Li Yuchun Wang Maosheng Zheng Ting Wang Alistair G.L.Borthwick Key Laboratory for Water and Sediment Sciences Ministry of Education College of Environmental Sciences and Engineering Peking University State Environmental Protection Key Laboratory of All Materials Fluxes in River Ecosystems Ministry of Ecology and Environment Laboratoire des Sciences du Climat et de l'Environnement Institut Pierre Simon LaplaceCommissariat à l' énergie Atomique et aux énergies AlternativesCNRS Université de Versailles Saint-Quentinen-Yvelines Key Laboratory of Reservoir Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of Sciences State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Department of Water Environment China Institute of Water Resources and Hydropower Research MOE Key Laboratory of Regional Energy Systems Optimization Resources and Environmental Research AcademyNorth China Electric Power University School of Engineering The University of Edinburgh

Dams are often regarded as greenhouse gas（GHG） emitters. However, our study indicated that the world's largest dam, the Three Gorges Dam（TGD）, has caused significant drops in annual average emissions of CO2, CH4and N2O over 4300 km along the Yangtze River, accompanied by remarkable reductions in the annual export of CO2（79%）, CH4（50%） and N2O（9%） to the sea. Since the commencement of its operation in 2003, the TGD has altered the carbonate equilibrium in the reservoir area, enhanced methanogenesis in the upstream, and restrained methanogenesis and denitrification via modifying anoxic habitats through long-distance scouring in the downstream. These findings suggest that ‘large-dam effects' are far beyond our previous understanding spatiotemporally, which highlights the fundamental importance of whole-system budgeting of GHGs under the profound impacts of huge dams.

关键词： Three Gorges Dam greenhouse gas spatiotemporal variation equilibrium Yangtze River whole system analysis

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Mof-on-Mof-Derived Cuo@In2o3 S-Scheme Heterojunction with Core-Shell Structure for Efficient Photocatalytic Co2 Reduction

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SSRN 2023年

作者： Liu, Xing Wu, Yuhan Li, Yudong Yang, Xiaohui Ma, Qinghai Luo, Juhua School of Materials Science and Engineering Yancheng Institute of Technology Yancheng224051 China Key Laboratory of Bio-based Material Science & Technology Ministry of Education Northeast Forestry University Harbin150040 China Key Laboratory of Reservoir Aquatic Environment Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences No. 266 Fangzheng Avenue Beibei District Chongqing400714 China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China

Herein, a MOF-on-MOF-derived In2O3 nanosheets encapsulating CuO ortho-octahedral core-shell structure CuO@In2O3 S-Scheme heterojunction composite was designed and prepared by a new strategy of interfacial engineering integrating optical and catalytic activity centers, and endowed with the catalyst's dual properties of both highly efficient light absorption and efficient charge separation. The In2O3 shell wraps around the CuO core in a tight coaxial contact, allowing the two to have the largest contact surface thus effectively promoting the transport of electrons and holes separated at the interface. More importantly, CuO@In2O3 formed a binuclear center could enhance the CO2 adsorption to facilitate the subsequent catalytic reaction and promote the charge transfer through Cu-O-In bonds. The successful construction of S-Scheme heterojunction not only promotes the spatial separation of electron-hole pairs, but also maintains the strongest redox potentials of CuO and In2O3 at the conduction and valence band positions. Notably, the intermediates in the CO2 photoreduction process were probed by in situ infrared spectroscopy and a possible photocatalytic mechanism was hypothesized. Under visible light irradiation, the CuO@In2O3 rates of photocatalytic reduction of CO2 to produce CH4 and CO were 190.32 μmol g-1 h-1 and 500.46 μmol g-1 h-1, which are 2.1, 10.3 times and 2.4, 7.9 times higher than pristine CuO and In2O3, respectively. This work provides a feasible strategy for the design and synthesis of binuclear-centered photocatalysts with interfacially engineered modulation and application to the photocatalytic reduction of CO2. © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

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Intrinsic-Strain engineering by Dislocation Imprint in Bulk Ferroelectrics

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Physical Review Letters 2023年第1期131卷 016801-016801页

作者： Fangping Zhuo Xiandong Zhou Shuang Gao Felix Dietrich Pedro B. Groszewicz Lovro Fulanović Patrick Breckner Bai-Xiang Xu Hans-Joachim Kleebe Dragan Damjanovic Jürgen Rödel Department of Materials and Earth Sciences Technical University of Darmstadt 64287 Darmstadt Germany Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province College of Architecture and Environment Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China Institute of Physical Chemistry Technical University of Darmstadt 64287 Darmstadt Germany Department of Radiation Science and Technology Delft University of Technology Delft 2629JB Netherlands Institute of Materials École Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland

We report an intrinsic strain engineering, akin to thin filmlike approaches, via irreversible high-temperature plastic deformation of a tetragonal ferroelectric single-crystal BaTiO3. Dislocations well-aligned along the [001] axis and associated strain fields in plane defined by the [110]/[1¯10] plane are introduced into the volume, thus nucleating only in-plane domain variants. By combining direct experimental observations and theoretical analyses, we reveal that domain instability and extrinsic degradation processes can both be mitigated during the aging and fatigue processes, and demonstrate that this requires careful strain tuning of the ratio of in-plane and out-of-plane domain variants. Our findings advance the understanding of structural defects that drive domain nucleation and instabilities in ferroic materials and are essential for mitigating device degradation.

关键词： Defects Domains Ferroelectricity Piezoelectricity Crystalline systems Dielectrics Materials modeling Nuclear magnetic resonance Phase-field modeling Scanning probe microscopy Strain engineering

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Characteristics of Spatial and Temporal Vegetation Index Variability and Its Responses to Temperature and Precipitation in Mongolia

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Journal of Resources and Ecology 2024年第5期15卷 1175-1184页

作者： YANG Meihuan LI Yawen WANG Tao WANG Juanle LI Pengfei LI Ting HUANG Jing Ochir ALTANSUKH Davaadorj DAVAASUREN School of Geomatics and Geoinformation Xi’an University of Science and TechnologyXi’an 710054China Institute of Land and Space Xi’an University of Science and TechnologyXi’an 710054China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChineseAcademy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China Department of Environment and Forest Engineering School of Engineering and Technology and Environmental Engineering LaboratoryNationalUniversity of MongoliaUlaanbaatar 14201Mongolia Department of Geography School of Art and SciencesNational University of MongoliaUlaanbaatar 14201Mongolia

The Mongolian Plateau,a vital ecological barrier in northern China,is of great importance for studying vegetation dynamics in Mongolia against the background of climate *** studies can enhance our understanding of regional vegetation responses to global warming and contribute to the establishment of a stronger ecological barrier in northern ***,we analyzed the spatial and temporal characteristics of the NDVI(normalized difference vegetation index)in Mongolia using 8 km resolution GIMMS NDVI3g data from 1990 to 2022,along with temperature,precipitation,and elevation *** analysis and correlation methods were used to examine the relationships between the NDVI and temperature,as well as *** results showed four important aspects of these relationships.(1)The NDVI in Mongolia increased significantly from 1990 to 2022 at a rate of 0.0015 yr^(-1)(P<0.05).(2)Mongolia’s NDVI increased from 1990 to 2022 in 60.73%of the *** this total,the area with a significant increase accounted for 31.67%and was concentrated on the eastern and western *** area experiencing a significant decrease accounted for 15.67%and was mainly located on the southwestern edges.(3)The NDVI analysis revealed significant increasing trends in all regions except for those at elevations of 1500-2000 *** greatest rate of increase was observed between 500 and 1000 m,and the increasing trend weakened as elevation continued to increase before gradually becoming significant ***,the NDVI increased significantly across different slopes,and the rate of increase decreased as the slope increased.(4)From 1990 to 2022,Mongolia’s NDVI was mostly negatively correlated with *** occurred over 66.75%of the total land area,with 17.21%of the region exhibiting a significant negative correlation,mainly in the ***,the NDVI demonstrated a positive correlation with precipitation,encompassing 86.71%of the total land *** 4

关键词： normalized difference vegetation index slope elevation trend analysis correlation analysis Mongolia

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Phosphorus Release Enhancement by Edta Combined with Thermal Hydrolysis and High Efficient Recovery of Vivianite From Digested Sewage Sludge

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SSRN 2024年

作者： Ma, Juan Yang, Ke Zhou, Yijun Song, Dongjie Guan, Zekang Kang, Suqin School of Environmental and Municipal Engineering Lanzhou Jiaotong University Lanzhou730070 China Centre of Gansu Wastewater Treatment Industry Technology Lanzhou730070 China Key Laboratory of Yellow River Water Environment in Gansu Province Lanzhou730070 China

In this study, EDTA combined with thermal hydrolysis was employed as a pretreating process of digested sludge to investigate the effect of EDTA on the phosphorus release anaerobically and effectiveness of vivianite generation to achieve efficient recovery of phosphorus from the residual sludge of a municipal wastewater treatment plant. The results showed that EDTA combined with thermal hydrolysis could effectively complex metal ions and improve the phosphorus release performance, reducing the influence of metal ions on the recovery of vivianite. The complexation of EDTA and metal ions was found in the order of Al3+ >Fe3+ >Ca2+ >Mg2+. Moreover, the concentration of phosphate in the supernatant increased with the amount of EDTA added during the anaerobic process and reached the peak value as the dosage of EDTA was 15 mmol/L. Furthermore, the concentrations of PO43- and Fe2+ in the supernatant of the anaerobic system decreased after 3-4h days in the environment with rich iron, indicating the formation of vivianite considerably. The characterization of XRD and SEM-EDS proved that the ideal phosphorus recovery product could be obtained through EDTA+thermal hydrolysis pretreatment. The results of this study could provide theoretical basis and technical support for high quality phosphorus recovery in municipal wastewater treatment plants. © 2024, The Authors. All rights reserved.

关键词： Wastewater treatment

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Study on Collagenolytic Mechanism Of Endogenous Matrix Metalloproteinase-2 In Grass Carp (Ctenopharyngodon Idella)

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SSRN 2025年

作者： Shen, Jiandong Zhong, Bijiang Fu, Lijun Xia, Wenshui Xu, Yanshun Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants Key Laboratory of Ecological Environment and Information Atlas College of Environmental and Biological Engineering Putian University Fujian Putian351100 China Office of Science and Research Putian University Fujian Putian351100 China State Key Laboratory of Food Science and Resources School of Food Science and Technology Jiangnan University Jiangsu Wuxi214122 China Jiangnan University China

Texture is an important characteristic for fishery products, influencing its quality classification and commercial value. Matrix metalloproteinases (MMPs) are deemed to participate in collagenolysis of postmortem fish flesh, whereas its mechanism is still unclear. This study revealed that a 66 kDa enzyme with gelatinolytic activity was separated from grass carp (Ctenopharyngodon idella) by ammonium sulfate precipitation technique and column chromatographic method, and identified as MMP-2 by liquid chromatography coupled with mass spectrometry analysis. In vitro experiments revealed that some collagen fibril bundles and individual fibrils were disintegrated from collagen fibers after digestion of MMP-2 for 48 h, along with a release of pyridinium cross-links (19.99±1.02%), hydroxyproline (15.04±0.03%) and glycosaminoglycan (11.21±0.03%). Meanwhile, MMP-2 treated samples mostly remained the triple-helical domain of collagen after treatment for 48 h, whereas their thermal stability was reduced. Furthermore, collagen fibers with high-level structures were more resistant to hydrolysis than collagen monomer and gelatin. All bands of gelatin and 90% of collagen monomer were digested in 45 min and 4 h respectively. All these results suggested that MMP-2 might take part in the breakdown of collagen fibers by the destruction of cross-links, and the degradation of collagen molecules and proteoglycans in textural deterioration of refrigerated grass carp. © 2025, The Authors. All rights reserved.

关键词： Column chromatography

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Correction to: Matched MnO@C anode and porous carbon cathode for Li-ion hybrid supercapacitors (Rare Metals, (2023), 10.1007/s12598-022-02233-5)

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Rare Metals 2023年第4期44卷 2869-2869页

作者： An, Cui-Hua Li, Yue-Qing Wu, Shuai Gao, Ling-Xiao Lin, Li-Yang Deng, Qi-Bo Hu, Ning Key Laboratory of Hebei Province on Scale-Span Intelligent Equipment Technology and School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Wuhan Green Power Hydrogen Energy Technology Co. Ltd Wuhan430000 China The Green Aerotechnics Research Institute Chongqing Jiaotong University Chongqing401120 China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin300130 China

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Unlocking the Potential of Heat Pump Systems with Phase Change Materials: Comprehensive Analysis of Coupled Applications for Enhanced Energy Efficiency

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SSRN 2024年

作者： Dai, Zeyu Zhang, Xuedan Zhang, Tiantian Wang, Tianqi Liu, Xue Li, Jiageng Guo, Linkai School of Civil Engineering and Transportation Northeast Forestry University Harbin150040 China Institute of Artificial Environment Control and Energy Application Northeast Forestry University Harbin150040 China School of Architecture Harbin Institute of Technology Harbin150090 China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology Harbin150090 China

In the pursuit of achieving rapid carbon peak and carbon neutrality, there has been a growing focus on renewable energy and thermal energy storage (TES) technology. Phase change materials (PCMs) have emerged as a promising solution for enhancing the performance of heat pump systems. In the realm of building energy conservation, the integration of PCM and heat pump technology has garnered significant attention for its ability to effectively and efficiently improve energy utilization. This paper provided a comprehensive classification and characterization of PCMs. Subsequently, it presented an overview of three types of coupled systems: air source heat pump (ASHP), ground source heat pump (GSHP), and solar-assisted heat pump (SAHP) systems, all combined with PCM. Extensive examination and analysis have been conducted to investigate the benefits of PCM in improving energy efficiency in various interconnected systems. Additionally, PCM has shown potential in decreasing overall energy consumption and operating costs for GSHP systems, while also reducing reliance on environmental conditions and improving energy regulation for SAHP systems. Finally, the paper summarized the current challenges, potential solutions, and future research directions in integrating PCM and heat pump technologies. © 2024, The Authors. All rights reserved.

关键词： Thermal energy

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Volatile organic compounds at a highland forest site in the southeast of the Tibetan Plateau: Source apportionment and reactivity contributions

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environmental Pollution 2025年 366卷 125410页

作者： Guo, Shuzheng Ye, Chunxiang Lin, Weili Chen, Yi Zeng, Limin Yu, Xuena Cui, Jinhui Zhang, Chong NEAC Key Laboratory of Ecology and Environment in Minority Areas College of Life and Environmental Sciences Minzu University of China Beijing100081 China School of Engineering China University of Petroleum-Beijng at Karamay Xinjiang Karamy834000 China College of Environmental Science and Technology Peking University Beijing100871 China

Atmospheric volatile organic compounds (VOCs) are reactive species and the primary precursors of free radicals;thus, VOCs play important roles in tropospheric chemistry. Tibet field campaigns from April 4 to May 11, 2021 found high mixing ratios and reactivity contributions of oxygenated VOCs (OVOCs) at Lulang, a site with high vegetation cover and strong solar ultraviolet radiation on the southeast of the Tibetan Plateau (TP). The 13 OVOCs detected accounted for 49% of the total VOCs (TVOCs, with a mean mixing ratio ±1σ of 11.7 ± 4.4 ppb）. These OVOCs exhibited typical diurnal variation, with high values in the daytime and a peak at approximately 12:00. OVOCs contributed 65% and 63% to VOC-kOH and the ozone formation potential, respectively. Two independent methodologies were employed to determine the contributions of various sources and revealed concordant conclusions regarding the importance of biological sources there. The source apportionment results obtained through positive matrix factorization indicated that sunlight-impacted and direct plant emission sources both related to plant sources contributed 47% of the TVOCs and 65% of the OVOCs. OVOC source fitting through the photochemical age parameterization method also indicated that biogenic sources made the largest contribution (67%) to OVOCs and revealed a clear peak at noon. In addition, biomass burning sources were found to be closely related to the VOC background because biomass burning is highly prevalent across the whole TP;these sources made the second greatest contribution (33%) to the TVOCs and contributed more than 23% of OVOCs. Our findings enhance comprehension of VOCs in the highland forest region, potentially impacting tropospheric chemistry significantly. © 2024 Elsevier Ltd

关键词： Volatile organic compounds

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Analysis of Nitrogen-Doped Carbon Quantum Dots in Aqueous and Soil environments for the Presence of Hg2+

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SSRN 2024年

作者： Min, Xin Wu, Zitong Liu, Shuyu School of Environment and Chemical Engineering Shanghai University Shanghai201800 China Shanghai Zhixi Technology Co. Ltd Shanghai201815 China Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants ShaanXi Xi'An710054 China

In this study, a nitrogen-doped blue fluorescent carbon quantum dots (N-CQDs) system was constructed to characterize Hg in the environment. Spectroscopic analysis showed that it has good photoluminescence and stability, and contains various functional groups on the surface. The optimal reaction conditions for the detection of Hg2+ by N-CQDs were pH 7, reaction temperature 25 °C, and reaction time 5 min. The ion selectivity and anti-interference experiments proved that it has good sensitivity and selectivity. The linear relationship between the analytical system of N-CQDs and the concentration of Hg2+ was used to construct the corresponding calculation equations, and the correlation coefficients were 0.994, and the limit of detection (LOD) values were 3.271 μM, respectively. The method can be used to detect Hg2+ in the aqueous and soil environments, and the recoveries were in the range of 96.7-105.2%. Finally, the comprehensive analysis showed that the fluorescence quenching mechanism was static quenching. © 2024, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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