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SSRN 2024年

作者： Feng, Ganyi Ouyang, Qing Li, Rui Jiang, Xianji Yang, Gang Liu, Xiaojie Tang, Hui Tian, Mingzhou Xiang, Qiang Deng, Menglong Long, Cimin Huang, Ruilin CAS Key Laboratory of Agro-Ecological Processes in Subtropical Region Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process Hunan Research Center of Livestock and Poultry Sciences South Central Experimental Station of Animal Nutrition and Feed Science The Ministry of Agriculture National Engineering Laboratory for Poultry Breeding Pollution Control and Resource Technology Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha410125 China University of Chinese Academy of Sciences Beijing100039 China College of Animal Science and Technology Hunan Co-Innovation Center of Animal Production Safety Hunan Agricultural University Changsha410128 China Hunan Provincial Key Laboratory of the TCM Agricultural Biogenomics Changsha Medical University Changsha410129 China

Two experiments were conducted to determine digestible energy (DE), metabolizable energy (ME), and standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in Chinese paddy rice for growing pigs, and to establish predictive equations for DE, ME and SID of CP and AA based on its chemical composition. In Exp. 1, twenty-four castrated barrows (20±1.3 kg) were selected and allotted to a replicated 12 × 3 incomplete Latin square design, including 12 diets and 3 consecutive periods. A basal diet and 11 Chinese paddy rice diets were prepared and maintained a consistent ratio of corn to soybean meal. Each period had 7 d of adaptation and 5 d of fecal and urine collection. In Exp. 2, twenty-four ileal-cannulated pigs (15.4 ± 1.8 kg) were used in a duplicated 12 × 3 incomplete Latin square design with 12 diets and three 7-day periods. Chinese paddy rice was the sole nitrogen (N) source in 11 test diets, and a N-free diet was used for calculating the basal endogenous N losses. The results revealed that DE and ME values (as-fed basis) in Chinese paddy rice averaged 12.29 MJ/kg and 11.71 MJ/kg, respectively. The optimal predictive equation for DE and ME were DE (MJ/kg) =16.120 - (0.460 × % NDF) + (122.409 × % Ca) (R2 = 0.845, RSD = 0.47, P © 2024, The Authors. All rights reserved.

关键词： Amino acids

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Seasonal Variation Of Microplastics In Surface Water and Sediment Of The Xiangjiang River: An Inland Urban Drinking Water Source

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SSRN 2023年

作者： Zhao, Wenyu Li, Jing Liu, Mengyue Wang, Rui Zhang, Boxuan Meng, Xiang-Zhou Zhang, ShengWei School of Hydraulic and Environmental Engineering Changsha University of Science & Technology Changsha410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province School of Hydraulic and Environmental Engineering Changsha University of Science and Technology Changsha410004 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China

While the Xiangjiang (XJ) River acts as an inland drinking water source, it may experience microplastics emissions originating from Changsha (CS) City. The aim of this study was to characterize the occurrence and distribution of microplastics in the XJ River during both the flooding and dry periods. Samples of surface river water and sediment of the XJ River in CS City were collected in August and December, 2020 and analyzed for composition of microplastics. The results showed ubiquitous presence of microplastics in surface water and sediment of the XJ River at abundances of 0.72–18.6 (7.32 ± 2.36) items L−1 and 26.3–302 (150 ± 75.6) items kg−1 dry weight (dw), respectively, during the flooding period, lower than those of 2.88–17.7 (11.0 ± 3.08) items L−1 and 27.0–651 (249 ± 182) items kg−1 dw during the dry period. Higher microplastic abundance was found mainly in urban centers as well as downstream of wastewater treatment plants, implying anthropogenic activities to be a source of microplastics. The high variances in the shapes, color, and types of microplastics in surface waters and sediments implied the action of specific enrichment processes and long-term sources of microplastics pollution. Most (60%) of microplastics particles in both the river water and sediment were in the size range of 50–100 μm. Fourier transform infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) indicated that microplastics were subjected to weathering in the environment, contributing to the production of oxygen-containing functional groups and surface cleavage features. Energy Dispersive Spectroscopy (EDS) showed that microplastics bonded to multiple heavy metals, emphasizing the complex nature of microplastics pollution. The results indicate concerning levels of microplastics in the XJ River, despite its status as a high-quality water source. © 2023, The Authors. All rights reserved.

关键词： Sediments

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Identiﬁcation and hazard analysis of heavy metal sources in agricultural soils in ancient mining areas: A quantitative method based on the receptor model and risk assessment

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Journal of Hazardous Materials 2023年 445卷

作者： Zhou, Hao Chen, Yong Yue, Xuemei Ren, Dajun Liu, Yanzhong Yang, Ke Wuhan University of Science and Technology No.947 Heping Avenue Hubei Wuhan430080 China National Key Laboratory of Environmental Protection Mining and Metallurgy Resource Utilization and Pollution Control Hubei Wuhan430080 China Hubei Provincial Key Laboratory of Eﬃcient Utilization and Agglomeration of Metallurgical Mineral Resources Hubei Wuhan430080 China

Industry in ancient mining areas caused signiﬁcant heavy metal pollution (HMP) in agricultural soils. This study measured the hazards of speciﬁc sources of heavy metals (HMs) in an ancient mining areas agricultural soil. Firstly, we identiﬁed the major pollution sources based on the PMF model. Then, the proposed single-factor pollution load index (SPLIzone) and ecological load index (SELIzone) analyzed the integrated pollution and ecological risks of various elements. Finally, the source-speciﬁc soil contamination levels and ecological risks were quantiﬁed by combining the source assignment and single-factor assessment processes. SPLIzone and SELIzone showed that Cu and Cd were the most contaminated elements. Five factors were determined as the major sources of HMs, including mining, natural, smelting industry, agricultural and traﬃc sources. The mining sources contributed the most soil contamination (33.73%). However, the largest contributor to ecological risk was the smelting industrial (42.18%). Lower soil contamination may contain higher ecological risk. Smelting industrial and traﬃc are the most critical sources that need to be controlled at present. This study proposes a quantitative method for assessing the hazards of HM sources, which provides a beneﬁcial reference for the study and management of HMP. © 2022 Elsevier B.V.

关键词： Heavy metals

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Time-Delay Feedback control of a Suspended Cable Driven by Subharmonic and Superharmonic Resonance

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SSRN 2024年

作者： Peng, Jian Li, Yanan Li, Luxin Lenci, Stefano School of Civil Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control Hunan University of Science and Technology Hunan Xiangtan411201 China School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou450045 China Department of Civil and Building Engineering and Architecture Polytechnic University of Marche Ancona60131 Italy

The longitudinal time-delay feedback control strategy is adopted to suppress the subharmonic and superharmonic responses of the suspended cable. Based on the Hamilton variational principle and the longitudinal time-delay feedback strategy, the in-plane nonlinear differential equations for a suspended cable are formulated, and Galerkin method is utilized to transform the equations into delayed differential equations. By using the method of multiple scales, approximate solutions for the 1/2-subharmonic and second-order superharmonic resonance responses of the controlled suspended cable were derived. The effects of the time delay and control gain are obtained through numerical examples. The research results demonstrate that by adjusting the control gain and time delay, resonance regions can be avoided, effectively suppressing the large-amplitude vibrations of the suspended cable and achieving favorable control performance. © 2024, The Authors. All rights reserved.

关键词： Time delay

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Interaction of soil microbial communities and phosphorus fractions under long-term fertilization in paddy soil

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Journal of Integrative Agriculture 2022年第7期21卷 2134-2144页

作者： Muhammad QASWAR Waqas AHMED HUANG Jing LIU Kai-lou ZHANG Lu HAN Tian-fu DU Jiang-xue Sehrish ALI Hafeez UR-RAHIM HUANG Qing-hai ZHANG Hui-min National Engineering Laboratory for Improving Quality of Arable Land/lnstitute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Department of Environment Faculty of Bioscience EngineeringGhent UniversityGhent 9000Belgium Guangdong Provincial Key Laboratory for Radionuclides Pollution Control and Resources School of Environmental Science and EngineeringGuangzhou UniversityGuangzhou 510006P.R.China National Observation Station of Qiyang Agri-ecology System/lnstitute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesQiyang 426182P.R.China National Engineering and Technology Research Center for Red Soil Improvement/Jiangxi Institute of Red Soil Nanchang 331717P.R.China Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education/School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024P.R.China

Understanding the impact of biological activities on the soil phosphorus(P)distribution under long-term fertilizer application can facilitate better soil P fertility ***,the primary objectives of this study were to investigate the effect of long-term(since 1981)fertilizer application on the soil P fractions and microbial community and to evaluate correlations between the microbial community structure and P *** following treatments were implemented in a long-term field trial:no fertilization(CK),inorganic N and K(NK),inorganic P and K(PK),inorganic N,P and K(NPK)and manure+NPK(MNPK)*** study showed that the soil pH,soil organic carbon and total and available N and P concentrations were considerably higher in the MNPK treatment than in the CK *** soil microbial biomass C,N and P concentrations were also significantly higher in the MNPK treatment than in the CK *** fertilization treatments,theβ-1,4-glucosidase,α-1,4-glucosidase,urease,acid phosphatase and phosphodiesterase activities were the highest in the MNPK *** to inorganic fertilization,the MNPK treatment increased the labile soil P fractions and decreased the residual soil P *** fertilization significantly affected the soil microbial *** total phospholipid fatty acid(PLFA)concentrations in the NK,PK,NPK and MNPK treatments were 23.3,43.1,48.7 and 87.7%higher,respectively,than in the CK treatment.A significant correlation was observed between the microbial community and soil P ***,the aggregated boosted tree(ABT)model showed that among the various soil biochemical properties,the total PLFA concentration was the factor that most influenced the active P pool,accounting for 35.4%of the relative influence of all soil biochemical properties *** findings reveal that combined manure and inorganic fertilizer application is a better approach than applying inorganic fertilizer alone fo

关键词： enzyme activities long-term fertilization microbial community microbial biomass phosphorus fraction

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Large-scale production of holey graphite as high-rate anode for lithium ion batteries

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Journal of Energy Chemistry 2020年第9期29卷 122-127,I0004页

作者： Feng Xiao Xianghong Chen Jiakui Zhang Chunmao Huang Tong Hu Bo Hong Jiantie Xu Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510640GuangdongChina School of Physics South China University of TechnologyGuangzhou 510640GuangdongChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Lithium ion batteries(LIBs)have been widely used in portable and smart devices because of their high energy densities,long cycle life and environmental *** order to meet the evergrowing demand for human-beings utilizi... 详细信息

关键词： H2O Holey graphite Rate capability Anode Lithium ion batteries

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Structure–Performance Correlation Guided Cerium-Based Metal–Organic Frameworks: Superior Adsorbents for Fluoride Removal in Water

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SSRN 2022年

作者： Tang, Xiaofeng Xia, Wu Qu, Xiaolin Liang, Yuntao Zeng, Yuxi Xiong, Weiping Cheng, Min Song, Biao Wang, Chaohai Zhou, Chengyun Zhao, Xiaoying Ministry of Education Changsha410082 China College of Biology Hunan University Changsha410082 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China

Fluoride in the hydrosphere exceeds the standard, which could be critically hazardous to human health and the natural environment. The adsorption method is a mature and effective way to remove pollutants in water, including fluoride. In this study, we synthesized three kinds of cerium-based metal–organic frameworks (Ce-MOFs) with different structures and properties by modulating the organic ligands (i.e., trimesic acid (BTC), 1,2,4,5-benzenetetracarboxylic acid (PMA), and terephthalic acid (BDC)) via the solvothermal method. The adsorption kinetics of Ce-MOFs on fluoride well fitted the pseudo second order model, and their adsorption isotherms also conform to Langmuir isothermal model. The thermodynamic study reveals that the adsorption process is a spontaneous endothermic reaction. The maximum saturated adsorption capacities of Ce-BTC, Ce-PMA, and Ce-BDC are 70.7, 159.6, and 139.5 mg g−1, respectively. Ce-MOFs have stable and excellent adsorption capacity at pH = 3−9. Coexisting anions (Cl−, SO42−, and NO3−) do not affect the performance of Ce-MOFs for fluoride removal. Moreover, Ce-MOFs also show their broad prospect as superior fluoride adsorbents because of their excellent performance and reusability in real water samples. Organic ligands have a remarkable influence on the defluoridation performance of Ce-MOFs. This work will provide a guiding significance for designing of MOFs as superiors adsorbents for defluoridation. © 2022, The Authors. All rights reserved.

关键词： Adsorption

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Extending application of asymmetric semi-circular bend specimen to investigate mixed mode Ⅰ/Ⅱ fracture behavior of granite

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Journal of Central South University 2022年第4期29卷 1289-1304页

作者： WU Qiu-hong XIE Cheng-long XIE You-sheng ZHAO Yan-lin LI Xue-feng LIU Jie WENG Lei Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal MinesHunan University of Science and TechnologyXiangtan 411201China School of Resources and Safety Engineering Central South UniversityChangsha 410083China College of Resources and Metallurgy Guangxi UniversityNanning 530004China Department of Building Engineering Hunan Institute of EngineeringXiangtan 411101China School of Civil Engineering Wuhan UniversityWuhan 430072China

The asymmetric semi-circular bend(ASCB)specimen has been proposed to investigate the cracking behavior in different geo and construction materials and attracted the attention of researchers due to its ***,there are few studies on the fracture toughness determination of rock *** this work,a series of fracture tests were performed with the ASCB specimens made of *** onset of fracture,crack initiation angle and crack propagating trajectory was analyzed in detail combined with several mixed mode fracture *** influence of the crack length on the mode Ⅰ/Ⅱ fracture toughness was studied.A comparison between the fracture toughness ratios predicted by varying criteria and experimental results was *** relationship between experimentally determined crack initiation angles and curves of the generalized maximum tangential stress(GMTS)criterion was *** fracture process of the specimen was recorded with the high-speed *** shortcomings of the ASCB specimens for the fracture toughness determination of rock materials were *** results may provide a reference for analysis of mixed mode I and II fracture behavior of brittle materials.

关键词： asymmetric semi-circular bend specimen rock fracture toughness crack growth trajectory crack initiation angle semi-circular bending generalized maximum tangential stress criterion

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Quantifying the impacts of COVID-19 on Sustainable Development Goals using machine learning models

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Fundamental Research 2024年第4期4卷 890-897页

作者： Chenyang Shuai Bu Zhao Xi Chen Jianguo Liu Chunmiao Zheng Shen Qu Jian-Ping Zou Ming Xu School of Management Science and Real Estate Chongqing UniversityChongqing 400044China bSchool for Environment and Sustainability University of MichiganAnn ArborMI 489United Stats Michigan Institute for Computational Discovery&Engineering University of MichiganAnn ArborMI 48109United States College of Economics and Management Southwest UniversityChongqing 400044China Center for Systems Integration and Sustainability Department of Fisheries and WildlifeMichigan State UniversityEast LansingMI 48824United States Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Management and Economics Beijing Institute of TechnologyBeijing 100081China Center for Energy&Environmental Policy Research Beijing Institute of TechnologyBejing 100081China Key Laboratory of Jiangxi Province for Persistent Plutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Department of Civil and Environmental Engineering University of MichiganAnn ArborMI 48109United States

The COvID-19 pandemic has posed severe threats to global sustainable ***,a comprehensive quantitative assessment of the impacts of COVID-19 on Sustainable Development Goals(SDGs)is still *** research quantified the post-COVID-19 SDG progress from 2020 to 2024 using projected GDP growth and population and machine learning models including support vector machine,random forest,and extreme gradient *** results show that the overall SDG performance declined by 7.7%in 2020 at the global scale,with 12 socioeconomic SDG performance decreasing by 3.0%-22.3%and 4 environmental SDG performance increasing by 1.6%-9.2%.By 2024,the progress of 12 SDGs will lag behind for one to eight years compared to their pre-COVID-19 trajectories,while extra time will be gained for 4 environment-related ***,the pandemic will cause more impacts on countries in emerging markets and developing economies than those on advanced economies,and the latter will recover more quickly to be closer to their pre-covID-19 trajectories by ***-COVID-19 economic recovery should emphasize in areas that can help decouple economic growth from negative environmental *** results can help government and non-state stakeholders identify critical areas for targeted policy to resume and speed up the progress to achieve SDGs by 2030.

关键词： Sustainable development goals COVID-19 Machine learning Global development Sustainable development assessment

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φ-pH diagrams and kinetics of V_(2)O_(3) prepared by solution-phase hydrogen reduction

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Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1290-1300页

作者： Yi-bo HU Yi-min ZHANG Nan-nan XUE Peng-cheng HU Liu-hong ZHANG College of Resources and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan 430081China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan 430081China

Solution-phase hydrogen reduction(Sp HR)was introduced into V_(2)O_(3)preparation to overcome disadvantages of traditional reduction roasting,which include a long process,high energy consumption,and generation of *** research mainly focuses onφ-pH diagrams and kinetics of *** analysis ofφ-pH diagrams for the V-H_(2)O system demonstrates that V_(2)O_(3)preparation via Sp HR requires a high temperature,a high vanadium concentration,and sufficient hydrogen in acidic *** analyses show that the activation energy of V_(2)O_(3)preparation via SpHR is 38.0679 k J/mol,indicating that the reduction is controlled by a combination of interfacial chemical reaction and internal *** of H;partial pressure(slope K=0.05246)on the reaction rate is not as significant as the vanadium concentration(K=1.58872).V_(2)O_(3)crystals with a purity of 99.59%and a vanadium precipitation rate of 99.83%were obtained under the following conditions:pH=5-6,c(V_(2)O_(3))=0.5 mol/L,p(H;)=4 MPa,m(PdCl;)=10 mg,T=250℃,and t=2.5 h.

关键词： V2O3 solution-phase hydrogen reduction φ-pH diagram kinetics

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