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Correction: Hybrid GNSS time-series prediction method based on ensemble empirical mode decomposition with long short-term memory

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Discover Applied sciences 2025年第2期7卷 1-2页

作者： Zhou, Yu He, Xiaoxing Wang, Shengdao Hu, Shunqiang Sun, Xiwen Huang, Jiahui School of Civil and Surveying and Mapping Engineering Jiangxi University of Science and Technology Ganzhou China Division of Geodetic Science School of Earth Sciences The Ohio State University Columbus USA School of Geography and Environment Jiangxi Normal University Nanchang China School of Geophysics and Measurement-Control Technology East China University of Technology Nanchang China

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Air Infiltration Characteristics of Narrow Cracks Under Mechanical Ventilation in Oxygen-Enhanced and Heated Chambers on the Plateau

SSRN

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SSRN 2025年

作者： Dong, Wei Liu, Yanfeng Wang, Yingying Mei, Xinxing Yin, Wei School of Building Services Science and Engineering Xi’an University of Architecture and Technology Shaanxi Xi’an710055 China School of Construction Engineering Xinyu University Jiangxi Xinyu338000 China Building environment and energy engineering School of Civil Engineering Hunan University of Science and Technology Xiangtan411201 China Building Services Engineering Architecture and Civil Engineering Chalmers University of Technology Göteborg412 96 Sweden

At high altitudes, low atmospheric pressure and hypoxia can lead to altitude sickness. Oxygen-enhanced and heated chambers provide an effective solution. However, existing research primarily focuses on air infiltration through wide cracks in heated chambers at low altitudes, with limited investigation into narrow cracks under low-pressure conditions. This study employs numerical simulations to examine air infiltration characteristics of narrow cracks under mechanical ventilation in low-pressure conditions, considering multiple factors including crack geometry, surface roughness, atmospheric pressure, and oxygen concentration gradients. The results are validated using an extreme plateau environment simulation platform. It is shown that the crack height is the most sensitive factor affecting air infiltration load. As atmospheric pressure decreases, heat load can decrease by up to 36.76%. Additionally, smaller crack widths reduce sensitivity to crack shape and atmospheric pressure, though roughness sensitivity increases with decreasing width. When the aspect ratio exceeds 104, heat and oxygen loads exhibit a linear relationship with width. Longer cracks reduce heat and oxygen transfer efficiency. Moreover, buildings with crack heights under 1 mm possess better air tightness. Finally, a simplified calculation model for the air change rate of narrow cracks under mechanical ventilation at high altitudes is established. The findings of this study provide a theoretical basis for calculating heat and oxygen loads in high-altitude regions and practical guidance for optimizing window and door crack dimensions in high air-tightness buildings. © 2025, The Authors. All rights reserved.

关键词： Atmospheric pressure

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Deciphering environmental factors influencing phytoplankton community structure in a polluted urban river

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Journal of Environmental sciences 2025年第2期148卷 375-386页

作者： Xiaxia Li Kai Chen Chao Wang Tianyu Zhuo Hongtao Li Yong Wu Xiaohui Lei Ming Li Bin Chen Beibei Chai School of Water Conservancy and Hydroelectric Power Hebei University of EngineeringHandan 056038China Collaborative Innovation Center for Intelligent Regulation and Comprehensive Management of Water Resources School of Water Conservancy and HydroelectricHebei University of EngineeringHandan 056038China Hebei Key Laboratory of Intelligent Water Conservancy Hebei University of EngineeringHandan 056038China Tianjin Water Group Binhai Water Co. Ltd.Tianjin 300308China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China Chengdu University of Technology Chengdu 610059China College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China

Tuojiang River Basin is a first-class tributary of the upper reaches of the Yangtze River—which is the longest river in *** phytoplankton are sensitive indicators of trophic changes inwater bodies,characterizing phytoplankton communities and their growth influencing factors in polluted urban rivers can provide new ideas for pollution ***,we used direct microscopic count and environmental DNA(eDNA)metabarcoding methods to investigate phytoplankton community structure in Tuojiang River Basin(Chengdu,Sichuan Province,China).The association between phytoplankton community structure and water environmental factors was evaluated by Mantel *** environmental monitoring data were used to pinpoint major factors that influenced phytoplankton growth based on structural equation *** the phylum level,the dominant phytoplankton taxa identified by the conventional microscopic method mainly belonged to Bacillariophyta,Chlorophyta,and Cyanophyta,in contrast with Chlorophyta,Dinophyceae,and Bacillariophyta identified by eDNA ***α-diversity analysis,eDNA metabarcoding detected greater species diversity and achieved higher precision than the microscopic *** growth was largely limited by phosphorus based on the nitrogen-to-phosphorus ratios>16:1 in all water *** analysis and structural equation modeling also confirmed that the nitrogen-to-phosphorus ratio was the principal factor influencing phytoplankton *** results could be useful for implementing comprehensive management of the river basin *** is recommended to control the discharge of point-and surface-source pollutants and the concentration of dissolved oxygen in areas with excessive nutrients(e.g.,Jianyang-Ziyang).Algae monitoring techniques and removal strategies should be improved in 201 Hospital,Hongrihe Bridge and Colmar Town areas.

关键词： Environmental DNA Microscopic count Phytoplankton growth Structural equation modeling Tuojiang River Basin

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Determining the suitable ecological water level based on the response relationship between landscape connectivity and water level: A case study of Poyang Lake, China

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Ecological Indicators 2025年 175卷

作者： Zhang, Cheng Chen, Wenbo Huang, Fangfang School of Environmental Science and Engineering Zhejiang University of Water Resources and Electric Power Hangzhou310018 China Institute of Ecological Barrier for Coastal Zone Zhejiang University of Water Resources and Electric Power Hangzhou310018 China School of Surveying and Spatial Information Engineering East China University of Technology Nanchang330013 China Jiangxi Key Laboratory of Basin Ecological Process and Information East China University of Technology Nanchang330013 China School of Civil Engineering and Architecture Zhejiang Guangsha Vocational and Technical University of Construction Dongyang322100 China

Water level is an important indicator of hydrological regime of lake, and its spatio-temporal variation has a profound impact on habitat quality and biodiversity conservation. How to determine the suitable ecological water level has long been a hot issue in ecohydrology research. Taking Poyang Lake as a case and from the perspective of habitat, this study firstly used the range of variability approach (RVA) to analyze the natural water level regime of the lake. Then, the probability of connectivity (PC) was applied to analyze the dynamics of grassland connectivity and water connectivity after identifying the distribution pattern of grassland and water body at different water levels. Finally, the natural water level regime was corrected to the suitable ecological water level based on the response relationship between grassland connectivity, water connectivity and water level. The results showed as follows: (1) The annual variation of water level in Poyang Lake showed a significant unimodal distribution, with high water level in flood season from April to September and low water level in dry season from October to March of the following year. The annual water level can reach the highest of 22.63 m in July and the lowest of 7.12 m in February from 2000 to 2020. (2) The grassland and water body constitute the main habitats of Poyang Lake wetland. Under the disturbance of hydrological process, they presented the unique dynamic tradeoff relationships of "One shrinks while the other expands" and "One is fragmented while the other is connected", respectively. With the increase of water level, grassland connectivity decreased dramatically while water connectivity increased progressively. (3) The annual demand for suitable ecological water level is 14.82–15.65 m. In the wet season, the threshold of suitable ecological water is 14.82–16.96 m, while it is 11.75–14.82 m in the dry season. The threshold of monthly suitable ecological water level from January to December is succes

关键词： Biotic

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Chloride Ion Transmission Model under the Drying-wetting Cycles and Its Solution

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Journal of Wuhan university of technology(Materials science) 2014年第3期29卷 445-450页

作者：黄滢卫军 DONG Rongzhen ZENG Hua School of Civil Engineering Central South University College of Architecture and Civil Engineering Jiangxi Science & Technology Normal University Nation Engineering Laboratory for High Speed Railway Construction

The chloride ion transmission model considering diffusion and convection was established respectively for different zones in concrete by analyzing chloride ion transmission mechanism under the dryingwetting cycles. The finite difference method was adopted to solve the model. The equation of chloride ion transmission model in the convection and diffusion zone of concrete was discreted by the group explicit scheme with right single point （GER method） and the equation in diffusion zone was discreted by FTCS difference scheme. According to relative humidity characteristics in concrete under drying-wetting cycles, the seepage velocity equation was formulated based on Kelvin Equation and Darcy＇s Law. The time-variant equations of chloride ion concentration of concrete surface and the boundary surface of the convection and diffusion zone were established. Based on the software MATLAB the numerical calculation was carried out by using the model and basic material parameters from the experiments. The calculation of chloride ion concentration distribution in concrete is in good agreement with the drying-wetting cycles experiments. It can be shown that the chloride ion transmission model and the seepage velocity equation are reasonable and practical. Studies have shown that the chloride ion transmission in concrete considering convection and diffusion under the drying-wetting cycles is the better correlation with the actual situation than that only considering the diffusion.

关键词： under the drying-wetting cycles the chloride ion transmission model the group explicit scheme seepage velocity

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Nano-pore in C-S-H gel stability analysis of hardened cement pastes

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Key engineering Materials 2015年 645卷 335-340页

作者： Wu, Lang Xiong, Na Yu, Fangyan College of Architecture and Civil Engineering Jiangxi Science and Normal University Nanchang330013 China College of Architecture and Civil Engineering Nanchang Institute of Technology Nanchang330044 China

Based on capillary tension, surface free energy and elasticity theory, a collapse model of nano-pore in C-S-H gel was created in hardened cement pastes. The stability of pore was analyzed by Gibbs free energy theory. The results show that, the capillary is more stable while the capillary is grater and rounder in the case of the aperture changing in the nanometer scope. When the aperture is changing in the scope of micrometer, the collapse possibility of the capillary is tiny. If the capillary size is fixed, the capillary is more stable while the elastic modulus of hydrated products is higher. © (2015) Trans Tech Publications, Switzerland.

关键词： Gibbs free energy

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Influence of the source and molecular weights on sulfathiazole/sulfadiazine binding in sedimentary dissolved organic matter

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Journal of Environmental Management 2025年 386卷 125795页

作者： Yan, Caixia Zhang, Fei Nie, Minghua Luo, Yanqing Ding, Mingjun Nie, Shuhua Zhou, John L. College of Geography and Environmental Science Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands Hainan Normal University Haikou571158 China School of Geography and Environment Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of Education Jiangxi Province Key Laboratory of Ecological Intelligent Monitoring and Comprehensive Treatment of Watershed Jiangxi Normal University 99 Ziyang Road Nanchang330022 China Jiangxi Drug Inspection Center 1566 Beijing East Road Nanchang330029 China School of Civil and Environmental Engineering University of Technology Sydney SydneyNSW 2007 Australia

Sedimental dissolved organic matter (DOM) plays a crucial role in the migration of antibiotics in a lake environment, which is strongly associated with its physicochemical properties influenced by temporal and spatial variations. This study systematically investigated the binding behavior of sulfathiazole (ST) and sulfadiazine (SD) to DOM across different molecular weights (MWs) in sediments from Poyang Lake using multiple spectroscopic techniques. Results showed that the MW fractions of DOM from the onset of the dry season were higher than those before flooding. Additionally, key carbon parameters, including dissolved organic carbon and fluorescent components, were present in greater proportion in the truly dissolved phase and the low MW fraction of DOM. These properties of the low MW fraction of DOM enhanced its binding capacity for the two sulfonamides, with the partitioning coefficient (logKcoc) values of 5.20 and 5.06 for ST and SD, respectively. Dialysis experiments investigating the interaction between different concentrations of DOM and sulfonamides indicated that humic-like and protein-like components significantly influenced the migration of ST and SD, respectively. Moreover, protein-like components exerted a more substantial impact on the migration of sulfonamides in heavily polluted sampling sites, while the humic-like substances played a more significant role for the samples from the wetland protection area. The results enhanced the understanding of the significance of DOM sources and MW in influencing the environmental fate of antibiotics in lake ecosystems. © 2025

关键词： Lake pollution

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Study on Countermeasures of Unbalanced Quotation

Study on Countermeasures of Unbalanced Quotation

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2020 International Conference on Agricultural science and technology and Food engineering, ASTFE 2020

作者： Wan, Yun Wu, Lang Civil Engineering and Architecture Jiangxi Science and Technology Normal University Nanchang Jiangxi China

This paper takes the unbalanced quotation method in the process of project bidding as the research object, analyzes its common means, causes and possible consequences. Research shows that serious unbalanced quotation will disturb the normal process of bidding. Finally, from the perspective of the owner, put forward the response strategies before bidding, in bid evaluation and in project implementation. © The Authors, published by EDP sciences, 2020.

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Probabilistic assessment of response spectra for multiple damping levels in seismic hazard analysis

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Soil Dynamics and Earthquake engineering 2025年 196卷

作者： Zhang, Haizhong Zhang, Rui Zhao, Yan-Gang Si, Hongjun Zhang, Haixiu Eco-Science Course Faculty of Agriculture Yamagata University 1-23 Wakaba-machi Yamagata Tsuruoka-shi997-8555 Japan School of Geography and Tourism Qilu Normal University Jinan250200 China Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing100124 China Seismological Research Institute Inc. Tokyo Japan Luanping County Branch of Chengde Ecological Environment Bureau Chengde China

The response spectra for specific recurrence periods are typically constructed for a 5 % damping ratio based on probabilistic seismic hazard analysis (PSHA). Nevertheless, practical structures exhibit a range of damping characteristics, requiring response spectra at various damping levels. Commonly, a damping modification factor (DMF) is applied to adjust the 5 %-damped spectra derived from PSHA to other damping levels. Most DMF formulations, however, are developed solely through the regression analysis of seismic records, overlooking the consistency of the recurrence period of the response spectra before and after adjustment. A direct probabilistic analysis of the response spectra across different damping ratios provides a more reasonable solution, although it typically needs multiple ground motion prediction equations (GMPEs) for each damping level or, alternatively, the application of a DMF to adjust the 5 %-damped GMPE. However, many recent studies have highlighted the difficulty of directly constraining the scaling of the response spectra within GMPEs via seismological theory. To address this issue, this study proposes a new framework for conducting a probabilistic analysis of the response spectra across multiple damping ratios. The framework estimates site-specific response spectra for various damping ratios using a single GMPE for the Fourier amplitude spectrum (FAS) combined with a ground-motion duration model. Because the FAS is more closely related to the physics of wave propagation, its scaling within GMPEs is easier to constrain using seismological theory. Furthermore, the moment method, in conjunction with Latin hypercube sampling, is applied to calculate the exceedance probability for response spectra with any damping ratio, thereby obtaining the corresponding seismic hazard curves. The proposed framework was verified and compared with traditional approaches using a numerical example. The proposed framework enables the acquisition of response spectra f

关键词： Damping

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Research on Protection and Utilization Strategies of cultural Resources in Traditional Villages of Tourism Development 3

Research on Protection and Utilization Strategies of cultura...

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3rd International Conference on Energy Resources and Sustainable Development, ICERSD 2020

作者： Luo, Yiqing Wang, Donghua Wen, Haiqiao Civil Engineering and Architecture Jiangxi Science and Technology Normal University Nanchang Jiangxi330013 China

Pailou Village which is the hometown of Song Yingxing, who is the author of Tien-kung K'ai-wu, is taken as the research object in this paper. From the perspective of tourism development of traditional villages, the types of cultural resources in Pailou Village are summarized through combing the content of existing cultural resources. Then the value of its cultural resources is analyzed from three aspects: history and culture, art and society, tourism and economy. Therefore, the development path of the integration of culture and tourism is proposed, from five aspects of project positioning, industrial format, tourism planning, supporting facilities and smart tourism, the strategy of improving the tourism competitiveness of Pailou Village are summarized in this paper, which provides a theoretical reference for the sustainable development of traditional village tourism. © The Authors, published by EDP sciences 2021.

关键词： History

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