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High value-added utilization of desulfurized building gypsum as self-leveling mortar: the comprehensive effect of cement

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Environmental science and Pollution Research 2024年第22期31卷 32599-32613页

作者： Zhao, Min Fan, Puyue Zhang, Mingtao Huang, Jing Leng, Pengfei Peng, Jiahui School of Civil and Architectural Engineering Yangtze Normal University Chongqing408100 China School of Materials Science and Engineering Chongqing University Chongqing400045 China School of Civil Engineering and Architecture Chongqing University of Science and Technology Chongqing401331 China

The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be effectively applied in practical engineering projects. The influence of cement on water consumption rate of initial fluidity (W/M ratio), fluidity, setting time, mechanical strength, and water resistance of GSL were evaluated. Additionally, rheological parameter, heat of hydration, crystal morphology, and pore structure were also analyzed. Cement significantly improved the fluidity of slurry. Moreover, the compressive strength and softening coefficient of GSL reached 20.6 MPa and 0.56 at 10% cement, respectively. Furthermore, cement reduced the 30-min-fluidity loss and improved fludity by reducing the yield stress and increasing the plastic viscosity of screed. The transformation of hydration kinetics of GSL could be due to Ca2+ and OH− released by cement, thus resulting in the shortening of initial setting time and the prolongation of the interval between initial and final setting time. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) showed that CSH gel and AFt crystal would generate on the surface of CaSO4·2H2O crystal, making the structure more compact. Mercury intrusion porosimetry (MIP) indicated that cement greatly reduced the porosity through the water reduction effect in the early stage and continuous hydration in the later stage. The continuous hydration of cement also increased the shrinkage rate. This work was expected to provide reference for promoting the application of desulfurized building gypsum as the high value-added screed. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Gypsum

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Effective oxidation decomplexation of Cu-EDTA and Cu2+ electrodeposition from PCB manufacturing wastewater by persulfate-based electrochemical oxidation: Performance and mechanisms

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Environmental science and Pollution Research 2024年第20期31卷 30072-30084页

作者： Sun, Ming Liu, Xuemei Liu, Zhanmeng School of Civil Engineering and Architecture East China JiaoTong University Nanchang330013 China Jiangxi Provincial Academy of Eco-Environmental Science Research and Planning Nanchang330039 China School of Civil Engineering and Architecture Nanchang Institute of Technology Nanchang330099 China

Complex wastewater matrices such as printed circuit board (PCB) manufacturing wastewater present a major environmental concern. In this work, simultaneous decomplexation of metal complex Cu-EDTA and reduction/electrodeposition of Cu2+ was conducted in a persulfate-based electrochemical oxidation system. Oxidizing/reductive species were simultaneously produced in this system, which realized 99.8% of Cu-EDTA decomplexation, 94.5% of Cu2+ reduction/electrodeposition under the conditions of original solution pH = 3.2, electrode distance = 3 cm, [Na2S2O8]0 = 5 mM, current density = 12 mA/cm2, and reaction time = 180 min. The total treatment cost is as low as 0.80 USD/mol Cu-EDTA. Effective mineralization (74.1% total organic carbon removal) of the solution was obtained after 3 h of treatment. •OH and SO4•– drove the Cu-EDTA decomplexation, destroying the chelating sites and finally it was effectively mineralized to CO2, H2O and Cu2+. The mechanisms of copper electrodeposition on the stainless steel cathode and persulfate activation by the BDD anode were proposed based on the electrochemical measurements. The electrodes exhibited excellent reusability and low metal (total iron and Ni2+) leaching during 20 cycles of application. This study provide an effective and sustainable method for the application of the electro-persulfate process in treating complex wastewater matrices. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Electrodes

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Uncertainties in landslide susceptibility prediction:Influence rule of different levels of errors in landslide spatial position

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Journal of Rock Mechanics and Geotechnical engineering 2024年第10期16卷 4177-4191页

作者： Faming Huang Ronghui Li Filippo Catani Xiaoting Zhou Ziqiang Zeng Jinsong Huang School of Infrastructure Engineering Nanchang UniversityNanchang330031China Jiangxi Provincial Key Laboratory of Interdisciplinary Science Nanchang UniversityNanchang330031China Department of Geosciences University of PadovaVia Gradenigo 6Padova35131Italy School of Architectural Engineering Jiangxi Science and Technology Normal UniversityNanchang330031China Jiangxi Provincial Science and Technology Affairs Center Nanchang330006China Discipline of Civil Surveying and Conditioning EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleNSW2207Australia

The accuracy of landslide susceptibility prediction(LSP)mainly depends on the precision of the landslide spatial ***,the spatial position error of landslide survey is inevitable,resulting in considerable uncertainties in LSP *** overcome this drawback,this study explores the influence of positional errors of landslide spatial position on LSP uncertainties,and then innovatively proposes a semi-supervised machine learning model to reduce the landslide spatial position *** paper collected 16 environmental factors and 337 landslides with accurate spatial positions taking Shangyou County of China as an *** 30e110 m error-based multilayer perceptron(MLP)and random forest(RF)models for LSP are established by randomly offsetting the original landslide by 30,50,70,90 and 110 *** LSP uncertainties are analyzed by the LSP accuracy and distribution ***,a semi-supervised model is proposed to relieve the LSP *** show that:(1)The LSP accuracies of error-based RF/MLP models decrease with the increase of landslide position errors,and are lower than those of original data-based models;(2)70 m error-based models can still reflect the overall distribution characteristics of landslide susceptibility indices,thus original landslides with certain position errors are acceptable for LSP;(3)Semi-supervised machine learning model can efficiently reduce the landslide position errors and thus improve the LSP accuracies.

关键词： Landslide susceptibility prediction Random landslide position errors Uncertainty analysis Multi-layer perceptron Random forest Semi-supervised machine learning

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Discussion on blasting vibration monitoring for rock damage control in rock slope excavation

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Earthquake engineering and engineering Vibration 2022年第1期21卷 53-65页

作者： Yang Jianhua Cai Jiyong Yao Chi Zhang Xiaobo Liu Liansheng School of Civil Engineering and Architecture Nanchang UniversityNanchang 30031China School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Drill and blast is a commonly used method for rock slope excavation in hydropower *** blasting excavation of rock slopes,far-field vibration monitoring on the first upper berm for statutory compliance is usually performed to control the blast-induced rock damage to the final slope *** this study,for the rock slope excavation in the Jinping-I hydropower station,the field vibration monitoring and acoustic testing are presented to investigate the vibration characteristics on the first upper berm and the damage depth in the current *** relationship between the PPV on the first upper berm and the PPV damage threshold on the damage zone boundary is also studied through three-dimensional FEM *** results show that on the first upper berm,the maximum vibration velocity component occurs in the vertical *** on the blasting damage zone boundary,the horizontal radial vibration velocity is the maximum *** the Jinping-I slope with a bench height of 30 m,the radial PPV on the inner side of the first upper berm is 2.06%of the PPV threshold on the damage zone *** ratio is increased as the bench height ***,the bench height of the rock slope is an important factor that cannot be ignored in determining the allowable vibration velocity for rock damage control.

关键词： rock slope blasting excavation vibration rock damage

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Geotechnical engineering blasting:a new modal aliasing cancellation methodology of vibration signal de-noising

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Earthquake engineering and engineering Vibration 2022年第2期21卷 313-323页

作者： Yi Wenhua Yan Lei Wang Zhenhuan Yang Jianhua Tao Tiejun Liu Liansheng School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Civil Engineering and Architecture Nanchang UniversityNanchang 330031China School of Civil Engineering Guizhou UniversityGuiyang 550025China

In the present study of peak particle velocity(PPV)and frequency,an improved algorithm(principal empirical mode decomposition,PEMD)based on principal component analysis(PCA)and empirical mode decomposition(EMD)is proposed,with the goal of addressing poor filtering de-noising effects caused by the occurrences of modal aliasing phenomena in EMD blasting vibration signal decomposition *** results showed that frequency of intrinsic mode function(IMF)components decomposed by PEMD gradually decreases and that the main frequency is unique,which eliminates the phenomenon of modal *** the simulation experiment,the signal-to-noise(SNR)and root mean square errors(RMSE)ratio of the signal de-noised by PEMD are the largest when compared to EMD and ensemble empirical mode decomposition(EEMD).The main frequency of the de-noising signal through PEMD is 75 Hz,which is closest to the frequency of the noiseless simulation *** geotechnical engineering blasting experiments,compared to EMD and EEMD,the signal de-noised by PEMD has the lowest level of distortion,and the frequency band is distributed in a range of 0-64 Hz,which is closest to the frequency band of the blasting vibration *** addition,the proportion of noise energy was the lowest,at 1.8%.

关键词： blasting vibration frequency empirical mode decomposition modal aliasing de-noising

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Highly efficient activation of peroxymonosulfate via KOH-activated Fe@NC for the degradation of bisphenol A

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Environmental science and Pollution Research 2024年第49期31卷 58999-59011页

作者： Zhan, Peng Chai, Yandong Sun, Wei Hu, Feng-Ping Long, Lanlan Wang, Chuqiao Peng, Xiaoming Jiangxi Water Resources Institute Jiangxi Province Nanchang330013 China Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution College of Environmental Science and Engineering Nankai University Tianjin300350 China Jiangxi Vocational and Technical College of Communications Jiangxi Province Nanchang330013 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Province Nanchang330013 China

In this study, the KOH-modified Fe-ZIF-derived carbon materials (Fe@NC-KOH-x) were designed for Fenton-like systems to enhance bisphenol A (BPA) removal from wastewater. Compared with the Fe@NC without KOH activation, the pore structure, BET (Brunner-Emmet-Teller) surface area, and oxygen-containing functional group of KOH-activated Fe@NC-KOH-x are dramatically improved, which increases the adsorption and catalytic performance. The Fe@NC-KOH-900/PMS system showed significant BPA removal reactivity across wide pH ranges and low doses of Fe@NC-KOH-900. Interestingly, our findings indicated that the removal effectiveness of BPA improved when PMS was introduced following the saturation adsorption of Fe@NC-KOH-x, as compared to the simultaneous introduction of Fe@NC-KOH-x and PMS. More particularly, through regression analysis, we found that the proportion of reactive species in the Fe@NC-KOH-x/PMS system changes with the increase of pyrolysis temperature, and there was a certain relationship between structure–function and active species in the Fe@NC-KOH-x/PMS system. O-C = O, Fe-N4, C-O, and pyrrolic N in Fe@NC-KOH-x lead to the generation of •OH, and SO4−•, C = O, Fe-N4, and defect are closely related to FeIV = O, and the formation of 1O2 is affected by Fe-N4, graphite N, C = O, and defect. Also, the density functional theory (DFT) calculation and the potential correlation between catalyst active centers and reactive oxygen species indicate that Fe-N4 is the main active site of Fe@NC-KOH-x. These outcomes of the study offer an innovation for enhanced elimination of BPA in wastewater treatment and provide a dynamic understanding of the mechanism of BPA degradation. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Wastewater treatment

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Influence and characteristic of shading on photovoltaic performance of bifacial modules and method for estimating bifacial gain

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Building Simulation 2023年第10期16卷 1821-1833页

作者： Chenglong Luo Yuandan Wu Xiaoxiao Su Wu Zou Yanshun Yu Qingyang Jiang Lijie Xu School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing210094China Institute of Energy Research Jiangxi Academy of SciencesNanchang330096China College of Civil Engineering and Architecture Jiaxing UniversityJiaxing314001China School of Marine Engineering Jimei UniversityXiamen361021China

Bifacial PV modules have unique advantages in low-carbon building applications such as BIPV systems but often suffer from the shading problem resulting from higher surrounding objects or building ***-blank quantitative studies of PV performance of bifacial modules operating in actual environments as affected by shading on PV cells are lacking due to the difficulties of analysis caused by the existing multiple variable *** constructing an experimental comparison system on a flat roof of a building,we experimentally tested and analyzed the comparative variation characteristics of PV performance of bifacial and mono-facial modules under different shading area *** results show that from the viewpoint of photoelectric efficiency,the PV performance of both bifacial and mono-facial PV modules clearly varied with the shading fraction of PV cell in some linear rules,though it is difficult to find regularity from the perspective of output power which was also affected by dynamic solar radiation *** abnormal phenomenon emerged that the photoelectric efficiencies of the bifacial modules with small shading fraction were higher compared to the case without *** on the findings of the experimental results,a regression approximation method based on shading test results(RAST Method)is further proposed to analyze and calculate the bifacial gain of bifacial *** the case of the existing roof installation,the mean bifacial gains of the two bifacial modules with different inclination angles were 8.86%and 11.30%,respectively.

关键词： solar energy bifacial module shading numerical fitting bifacial gain

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Exploration On the Teaching Practice of Architectural Design Fundamentals Course Under the Guidance of Educational Informatization 3

Exploration On the Teaching Practice of Architectural Design...

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3rd International Conference on Education, Knowledge and Information Management, ICEKIM 2022

作者： Luo, Yiqing Zhang, Wenyan Li, Zhijian Jiangxi Science and Technology Normal University of Civil Engineering and Architecture Nanchang Jiangxi China Nanchang Universtiy Design and Research Institute Nanchang Jiangxi China

ISBN: (纸本)9781665416665

This paper aimed at the problems existing in the traditional teaching of architectural design fundamentals course in the information age, and discussed the feasibility of applying the new blended teaching mode to the teaching of architectural design fundamentals courses from platform positioning and objectives, content integration and reconstruction, and resource refinement and supplementation. In the same time, this paper updated the teaching concept of course practice according to the principles of appropriate advance, distribution according to ability, and evaluation within the group, verified and analyzed through teaching feedback, summarized the problems existing in blended teaching practice, and proposed corresponding teaching improvement strategies. © 2022 IEEE.

关键词： Teaching

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Analysis of Shallow Slide in Slope Based on Phase Space Reconstruction of Soil Moisture Content 29th

Analysis of Shallow Slide in Slope Based on Phase Space Reco...

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29th International Conference on Computational and Experimental engineering and sciences, ICCES 2023

作者： Zhu, Yuelu Xiao, Yaoting College of Water Conservancy and Ecological Engineering Nanchang Institute of Technology Nanchang Jiangxi330099 China College of Civil Engineering and Architecture Hubei University of Arts and Science Xiangyang Hubei441053 China

ISBN: (纸本)9783031425141

Meteorological conditions such as periodic rainfall, evaporation and wet-dry cycle can lead to changes in soil moisture content of the slope, which can lead to instability or shallow slide. The chaotic nature of the time series of soil moisture content derived from satellite was identified, and then the time series was reconstructed into a high-dimensional phase space to predict the soil moisture. Finally, the predicted soil moisture was used to analyze the shallow slide in slope in the future period. As a comparison, phase space method and linear regression method were used to analyze the slope in the study area. The predicted soil moisture content based on the phase space is very close to the measured value. The calculation results of GeoStudio software show that based on the phase space prediction, the slope will be in a stable state in the future period, which is consistent with the prediction results of Markov chain. The predicted soil moisture content based on the linear regression method is different from the measured value by 15.3%, which make the slope safety factor larger and cause misjudgment. Therefore, the proposed method can be used as a supplement to the traditional research on shallow slide in slope. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Slope stability

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Application of traditional symbols in interior decoration based on VR technology

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Applied Mathematics and Nonlinear sciences 2024年第1期9卷

作者： Hong, Ying Hu, Xiaoqiang Peng, Maolong College of Civil Engineering and Architecture Nanchang Jiaotong Institute Jiangxi Nanchang330100 China College of Education Jiangxi Science & Technology Normal University Jiangxi Nanchang330000 China

Traditional symbols, as visual symbols, are not only extremely widely used in traditional fields but are also constantly used in interior design. This paper first investigates the use of traditional symbols in interior decoration and the trend of integration of traditional symbols with modern design. Then, an index system is constructed to evaluate the level of development of interior design incorporating traditional symbols by establishing the original data matrix and determining the index weights. Finally, a fusion coordination model was established, and the data were analyzed for reliability, validity, and consistency tests to analyze the richness, taste, and emotional expression of interior design incorporating traditional symbols. The overall integration of traditional symbols with interior design increased from 0.4621 to 0.7346. The effect of traditional symbols in interior design based on VR technology on emotional performance in office scenes increased by 20% on average. The average of those who rated very conforming in different scenes was 20%, those who rated more conforming was 30%, and those who rated average performance was 10-20%. The research in this paper has important references and reference values for the use of traditional symbols in interior design. © 2023 Ying Hong, Xiaoqiang Hu and Maolong Peng, published by Sciendo.

关键词： Integration

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