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arXiv 2022年

作者： Guo, Songbai Xue, Yuling Li, Xiliang Zheng, Zuohuan School of Science Beijing University of Civil Engineering and Architecture Beijing102616 China School of Mathematics and Statistics Hainan Normal University Haikou571158 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Mathematics and Information Science Shandong Technology and Business University Yantai264005 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing100049 China

Considering the propagation characteristics of COVID-19 in different regions, the dynamics analysis and numerical demonstration of long-term and short-term models of COVID-19 are carried out, respectively. The long-term model is devoted to investigate the global stability of COVID-19 model with asymptomatic infections and quarantine measures. By using the limit system of the model and Lyapunov function method, it is shown that the COVID-19-free equilibrium V0 is globally asymptotically stable if the control reproduction number Rc c = 1, which means that COVID-19 will die out;the COVID-19 equilibrium V∗ is globally asymptotically stable if Rc > 1, which means that COVID-19 will be persistent. In particular, to obtain the local stability of V∗, we use proof by contradiction and the properties of complex modulus with some novel details, and we prove the weak persistence of the system to obtain the global attractivity of V∗. Moreover, the final size of the corresponding short-term model is calculated and the stability of its multiple equilibria is analyzed. Numerical simulations of COVID-19 cases show that quarantine measures and asymptomatic infections have a non-negligible impact on the transmission of *** Codes 34D23, 37N25, 92D30 Copyright © 2022, The Authors. All rights reserved.

关键词： COVID-19

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A novel analysis approach of uniform persistence for a COVID-19 model with quarantine and standard incidence rate

arXiv

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arXiv 2022年

A coronavirus disease 2019 (COVID-19) model with quarantine and standard incidence rate is first developed, then a novel analysis approach for finding the ultimate lower bound of COVID-19 infectious individuals is proposed, which means that the COVID-19 pandemic is uniformly persistent if the control reproduction number Rc > 1. This approach can be applied to other related biomathematical models, and some existing works can be improved by using that. In addition, the COVID-19-free equilibrium V0 is locally asymptotically stable (LAS) if Rc c = 1, respectively;while V0 is unstable if Rc > *** Codes 34D05, 37N25, 92D30 Copyright © 2022, The Authors. All rights reserved.

关键词： COVID-19

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Heavy metal contamination in fish and human health risks from lakes of a mega inter-basin water diversion

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Chemosphere 2025年 379卷 144407页

作者： Fan, Wenxia Xia, Wentong Lin, Lian-Shin Liu, Han Qu, Xiao Xin, Wei Tang, Lizhou Chen, Yushun College of Life Sciences Jiangxi Normal University Jiangxi Nanchang330022 China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Hubei Wuhan430072 China Wadsworth Department of Civil and Environmental Engineering West Virginia University MorgantownWV26506-6103 United States University of Chinese Academy of Sciences Beijing100049 China Huai’ an Research Center & SNWDP-ER Lake Ecosystem Field Station Institute of Hydrobiology Chinese Academy of Sciences Jiangsu Huai’ an223001 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Hainan Haikou570228 China Changjiang River Scientific Research Institute Hubei Wuhan430019 China Institute of Freshwater and Marine Biology and Conservation School of Life and Health Sciences Hunan University of Science and Technology Hunan Xiangtan411201 China

Heavy metals in freshwater lakes under inter-basin water diversions may pose harms to lake ecosystems and human health but have rarely been studied. We studied fish heavy metals in water diversion lakes, Gao-Bao-Shaobo Lakes (GBSLs), along the South-to-North Water Diversion Project in China, and evaluated associated human health risks from fish consumption. A total of 322 muscle samples from 29 fish species were collected to characterize contamination patterns of copper (Cu), chromium (Cr), cadmium (Cd), lead (Pb), and arsenic (As). The studied heavy metals in fish were found within China's food safety standards. Among the studied metals, Cu, Cd, Pb, and As had higher concentrations temporally in autumn and spatially in Gaoyou Lake. Moreover, Cd, Pb, and As in carnivores were significantly higher than other feeding groups, and Cd and As in upper-middle and upper water layers were significantly higher than other layers. Consumption of GBSLs fish did not pose a non-carcinogenic risk to human health. However, consumption of fish species such as Protosalanx hyalocranius, Carassius auratus, Culter alburnus may pose potential carcinogenic risks to human health due to Cr and Cd. The current study had implications for assessing aquatic ecological conditions and reducing human dietary health risks related to heavy metals in water diversion lakes. © 2025 Elsevier Ltd

关键词： Lake pollution

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Synergistic Effect of Steam Exploded Modified Biochar and Intercropping on the Phytoavailability and Accumulation of Lead in the Shared and Non-Shared Rhizosphere of a Vegetable-Grass System

SSRN

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SSRN 2024年

作者： Rizwan, Muhammad Murtaza, Ghulam Ahmed, Zeeshan Lin, Qimei Chen, Xuejiao Khan, Imran Abdelrahman, Hamada Antoniadis, Vasileios Ali, Esmat F. Lee, Sang Soo Leng, Lijian Shaheen, Sabry M. Li, Hailong School of Energy Science and Engineering Central South University Hunan Changsha410083 China College of Land Science and Technology China Agricultural University Beijing100193 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Xinjiang Institute of Ecology & Geography Chinese Academy of Sciences Urumqi830011 China Cele National Station of Observation and Research for Desert-Grassland Ecosystems Chinese Academy of Sciences Urumqi848300 China Agricultural Resources and Environmental Institute Guangdong Academy of Agricultural Sciences Guangzhou510640 China School of Food Science and Bioengineering Xihua University Chengdu610039 China Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Institute of Physical Chemistry Zhejiang Normal University Jinhua321004 China Cairo University Faculty of Agriculture Soil Science Department Giza12613 Egypt Department of Agriculture Crop Production and Rural Environment University of Thessaly Greece Department of Biology College of Science Taif University Taif21944 Saudi Arabia Department of Environmental and Energy Engineering Yonsei University Wonju26493 Korea Republic of University of Wuppertal School of Architecture and Civil Engineering Laboratory of Soil and Groundwater-Management Pauluskirchstraße 7 Wuppertal42285 Germany

The effects of engineered steam exploded biochar on the phytoavailability of toxic elements in the shared- and nonshared-rhizosphere of vegetable-grass intercropping system have not been investigated yet. Therefore, we explored and elucidated the synergistic effect of pristine rape-straw biochar (BC), steam exploded BC (BCSE), KMnO4-modified BCSE (BCSEMn), and hydroxyapatite-modified BCSE (BCSEHA) on the solubility, fractionation and phytoavailability of lead (Pb) in a vegetable-grass intercropping system. In a rhizosphere box, Brassica chinensis L. (pakchoi;PC, as a vegetable) and Pennisetum polystachion L. (mission grass;MG, as a Pb hyperaccumulator), were grown in the biochar treated soil with (non-shared rhizosphere) or without (shared rhizosphere) root separation. Addition of BCSEMn and BCSEHA, particularly BCSEMn, significantly improved plant growth, photosynthetic pigment levels, and positively influenced the gas exchange attributes by suppressing oxidative stress and boosting antioxidant enzymes activities. Both biochars altered a proportion of Pb in the acid soluble to the immobile fraction and thus significantly decreased its leachability (TCLP-Pb) and bioavailability (CaCl2-extrcated Pb) by 32.7%-33.9% and 48.5%-53.5%, respectively, as compared to the control. Both biochars, particularly BCSEMn, reduced significantly the Pb content in shoots and roots of PC and MG with a significantly higher efficiency in the PC than in the MG;this was the case more in the shared than in the non-shared rhizosphere. These findings indicate the synergistic effect of Mn-and hydroxyapatite-modified steam exploded biochar and intercropping for enhancing the grass hyper-accumulation capacity for Pb and reducing Pb uptake by edible plants in a vegetables-grass system, which could be used as a promising approach for the phytomanagement of Pb contaminated soils. © 2024, The Authors. All rights reserved.

关键词： Soils

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Cerebral micro-bleeding identification based on a nine-layer convolutional neural network with stochastic pooling

Cerebral micro-bleeding identification based on a nine-layer...

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作者： Wang, Shuihua Sun, Junding Mehmood, Irfan Pan, Chichun Chen, Yi Zhang, Yu-Dong School of Computer Science and Technology Henan Polytechnic University Jiaozuo China School of Architecture Building and Civil Engineering Loughborough University Loughborough United Kingdom Department of Informatics University of Leicester Leicester United Kingdom Department of Computer Science and Engineering College of Electronics and Information Engineering Sejong University Seoul Korea Republic of School of Computer Science and Technology Nanjing Normal University Nanjing China School of Business Nanjing Normal University Nanjing China Jiangsu Laboratory of Lake Environment Remote Sensing Technologies Huaiyin Institute of Technology Huaian China

Cerebral micro-bleedings are small chronic brain hemorrhages caused by structural abnormalities of the small vessels. CMBs can be found from individuals with stroke at memory clinics and even healthy elderly people. CMBs indicate hemorrhage-prone pathological states. Research shows that CMBs are associated with an increased risk of future ischemic stroke, intra-cerebral hemorrhage (ICH), dementia, and death. Considering that CMBs severely influence people's life, it is necessary to identify the CMBs in an early stage to prevent from further deterioration and to help people live a healthy life. In this paper, we proposed using CNN with stochastic pooling for the CMB detection. CNN has good performance in image and video recognition, recommender system, and nature language processing. Based on the collected subject, the experiment result shows that the six-convolution layer and three fully-connected layer CNN, nine-layers in total, achieved sensitivity, specificity, accuracy, and precision as 97.22%, and 97.35%, 97.28%, and 97.35% in average of ten runs, which shows better performance than five state-of-the-art methods. © 2019 John Wiley & Sons, Ltd.

关键词： Convolution

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Potential of carbon neutrality for a wastewater treatment plant based on recovery of carbon dioxide and heat from chemical looping combustion of sludge

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Journal of Water Process engineering 2025年 75卷

作者： Jialu Ye Yankun Li Guozhang Chang Xinhan Chen Cuiping Wang Jian Zhang Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266590 China College of Chemistry Chemical Engineering and Materials Sciences Shandong Normal University Jinan 250358 China

Recovery of heat from sludge by thermochemical processes is a promising route to achieve carbon reduction in a wastewater treatment plant (WWTP). The chemical looping combustion (CLC) was introduced to convert sludge into CO 2 and heat, followed by analyses on the potential of carbon neutrality for an anaerobic/anoxic/oxic (A 2 O) WWTP in Qingdao, China. The key parameters affecting CO 2 yield from CLC of sludge was investigated by a bench-scaled reactor with a response surface methodology. Using the life cycle assessment method (LCA) showed the reduction in greenhouse gas (GHG) emissions and the environmental impacts of sludge CLC on the WWTP. A sensitive rise in CO₂ yield is caused by increases in both oxygen-to‑carbon ratio (O/C) and reaction time. Prioritizing sludge moisture content (<63 %) and temperature (830–900 °C), followed by reaction time (>25 min) and O/C ratio (>8), is crucial for process optimization. The maximum CO 2 yield in CLC of sludge reached to 401.3 mL/(g sludge) with a carbon conversion of 97.7 % under the condition of a sludge moisture content of 59 %, a temperature of 838 °C, a reaction time of 26 min, and an O/C ratio of 9.8. By employing the optimized sludge CLC technique in 2023, the GHG value in the WWTP could be reduced by 54.4 %, while heat recovery and CO₂ capture from this technique would reduce total GHG by 22.5 % and 31.9 %, respectively. The values of global warming potential (GWP100) and abiotically depleted potential (ADP-fossil) were reduced by 58 % and 68 % by introducing sludge CLC to the operation of the WWTP.

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Protection Status and Development Strategies of Traditional Villages in Northwestern jiangxi Province

Protection Status and Development Strategies of Traditional ...

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作者： Yiqing Luo Lang Wu Civil Engineering And Architecture Jiangxi Science & Technology Normal University

5 traditional villages in northwestern jiangxi province are taken as the research objects in this paper, it carries on the field investigation and data arrangement on the content of the national traditional village evaluation and identification system, including the site selection and preservation of village pattern;the protection and utilization of traditional buildings;the non-material cultural heritage and its physical space environment. The results show that these traditional villages protection is faced with the problems of lack of integrity protection concept,improper construction management mode and conflict among relevant subjects. Finally, in view of the current situation, the protection and development strategies of traditional villages are put forward from three respects, Human-oriented thought, Development model and Industrial structure.

关键词： Protection Status and Development Strategies of Traditional Villages in Northwestern jiangxi Province

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Experimental determination on the critical angle of seismic incidence of curved bridge 42

Experimental determination on the critical angle of seismic ...

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42nd International Conference on Vibroengineering

作者： Deng, Tongfa Li, Weibin Feng, Ruiwei Wang, Yi Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control Jiangxi University of Science and Technology Jiangxi341000 China School of Architecture and Surveying and Mapping Engineering Jiangxi University of Science and Technology Jiangxi341000 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

The shaking table model test mainly focuses on the study of seismic response law, aseismic performance and seismic damping and isolation effect of bridges with a single or multi-platform shaking table. Basically, the plane principal axis direction is adopted for the seismic input of structural models. Little research effort considering multi-angle seismic input has been reported in the structural model test. In this paper we designed and conducted a small-scale shaking table model test to study the seismic response law of the curved girder bridges with seismic input at different angles, and provided experimental verification for the theoretical method of the most unfavorable angle of seismic input. The experimental results show that the variation trend of component response to variation of the seismic input direction is consistent with that of the numerical analysis, which indicates that the designed device is effective. © 2019 Tongfa Deng, et al.

关键词： Seismic response

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The Security Risk Evaluation of Railway Construction Based on CIM Model

The Security Risk Evaluation of Railway Construction Based o...

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作者： Tingyu Mei Yiqing Luo Fenfen Chen Lang Wu College of Architecture and Civil Engineering Jiangxi Science and Technology Normal University

In this paper, the CIM model is used to evaluate and manage the safety risk of subway construction. Taking Nanchang Metro Line 4 bid section 3 as an example, the total safety risk of the project construction is estimated, and the corresponding countermeasures are proposed, which is of certain significance to avoid and respond to the construction project *** results show that the possibility of moderate total safety risk in the construction of the third bid section of Nanchang Metro Line 4 is relatively large, and the probability is about 40%.

关键词： CIM Security The Security Risk Evaluation of Railway Construction Based on CIM Model

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Vehicle-bridge coupling vibration of curved beam bridge under earthquake excitation

Vehicle-bridge coupling vibration of curved beam bridge unde...

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作者： Jian Shen Lang Wu School of Civil Engineering and Architecture Jiangxi Science & Technology Normal University

Based on the non-inertial reference system, the vehicle model of four freedom degrees is used to establish the vehicle-bridge coupling dynamic system model of the curved beam in space. Considering the vehicle-bridge coupling vibration characteristics under the non-uniform seismic excitation at the two supports of the bridge, the three-dimension space curvilinear-vehicle coupling dynamic control equation is established based on the Hamiltonian principle. Then the coupling dynamic control equation of the vehicle and bridge is numerically analyzed by the method of separating variables.

关键词： Vehicle-bridge coupling vibration of curved beam bridge under earthquake excitation

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