作者机构：
[Zhou, Shuai; Wang, Yayi; Zhang, Yalei] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Siping Rd, Shanghai 200092, Peoples R China.;[Zhou, Shuai; Zhang, Siqi; Duan, Yi; Yang, Zhengqing] Univ South China, Sch Civil Engn, Hunan Prov Key Lab Pollut Control & Resources Reus, Hengyang 421001, Peoples R China.;[Gao, Yuanyuan; Tang, Zhenping] Univ South China, Hunan Prov Key Lab Rare Met Minerals Exploitat & G, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, YY ] T;Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Siping Rd, Shanghai 200092, Peoples R China.
关键词：
Activated sludge;Environmental condition;Extracellular antibiotic resistance genes;Metagenomics;Starvation;Substrate type
摘要：
Extracellular antibiotic resistance genes (eARGs) are important emerging environmental pollutants in wastewater treatment plants (WWTPs). Nutritional substrate deficiency (i.e., starvation) frequently occurs in WWTPs owing to annual maintenance, water quality fluctuation, and sludge storage; and it can greatly alter the antibiotic resistance and extracellular DNA content of bacteria. However, the fate and corresponding transmission risk of eARGs in activated sludge under starvation stress remain largely unknown. Herein, we used metagenomic sequencing to explore the effects of starvation scenarios (carbon, nitrogen, and/or phosphorus deficiency) and environmental conditions (alternating anaerobic-aerobic, anaerobic, anoxic, and aerobic) on the distribution, mobility, and hosts of eARGs in activated sludge. The results showed that 30 days of starvation reduced the absolute abundances of eARGs by 40.9%-88.2%, but high-risk dual and multidrug resistance genes persisted. Starvation, particularly the simultaneous lack of carbon, nitrogen, and phosphorus under aerobic conditions, effectively alleviated eARGs by reducing the abundance of extracellular mobile genetic elements (eMGEs). Starvation also altered the profile of bacterial hosts of eARGs and the bacterial community composition, the latter of which had an indirect positive effect on eARGs via changing eMGEs. Our findings shed light on the response patterns and mechanisms of eARGs in activated sludge under starvation conditions and highlight starvation as a potential strategy to mitigate the risk of previously neglected eARGs in WWTPs.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2023年332(9):3597-3607 ISSN：0236-5731
通讯作者：
Wang, R
作者机构：
[Wang, Rui] NingboTech Univ, Sch Civil Engn & Architecture, Ningbo 315100, Zhejiang, Peoples R China.;[Wang, Rui; Ye, Jiayuan] China Bldg Mat Acad, State Key Lab Green Bldg Mat, Beijing 100024, Peoples R China.;[Wang, Jingsong; Peng, Xiaoying] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, R ] N;NingboTech Univ, Sch Civil Engn & Architecture, Ningbo 315100, Zhejiang, Peoples R China.;China Bldg Mat Acad, State Key Lab Green Bldg Mat, Beijing 100024, Peoples R China.
关键词：
Geopolymer;Radionuclide;Si/Al ratio;Adsorption and diffusion;Molecular dynamics simulation
摘要：
Geopolymer is a kind of inorganic cementitious material, which is produced by geopolymerization of activator and aluminosilicate. It can be used for solidification of radionuclides. In this study, molecular dynamics simulation was applied to investigate that the adsorption and diffusion mechanism of radioactive nuclide cesium and chloride ions in the channel of geopolymer with different Si/Al ratios. The simulation results could be characterized by density distribution, radial distribution function (RDF), hydrogen bond, mean square displacement (MSD) and diffusion coefficient. Density distribution indicated that there is an obvious aggregation of Cs+ and Cl- on the channel surface. Moreover, the composition of geopolymer gel has a great influence on the dynamic characteristics of ions. With the decrease of Si/Al ratio, both MSD and diffusion coefficient of cesium and chloride ions gradually reduced. It showed that the adsorption of geopolymer channel for Cs+ and Cl- gradually enhanced, and diffusion ability of Cs+ and Cl- has steadily decreased.
期刊：
Chemical Engineering Journal,2023年454:140365 ISSN：1385-8947
通讯作者：
Xie, Dong(xiedong@usc.edu.cn)
作者机构：
[Li, Suzhe; Tang, Zengming; Yang, Xiaomin] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, Dong; Li, Suzhe; Tang, Zengming; Yang, Xiaomin] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.;[Xie, Dong; Dai, Shiliang] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Dai, Shiliang; Wang, Weihao] Hunan Sunny Technol Engn Co Ltd, Hengyang 421001, Peoples R China.
通讯机构：
[Dong Xie] N;National and Local Joint Engineering Research Center of Airborne Pollutants Treatment and Radioactive Protection in Building Environment, Hengyang 421001, China<&wdkj&>School of Civil Engineering, University of South China, Hengyang 421001, China
期刊：
Journal of Materials Research and Technology,2023年24:333-345 ISSN：2238-7854
通讯作者：
Sheng Zeng
作者机构：
[Yang, Peng; Sun, Bing; Liu, Shun] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Zeng, Sheng] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Sheng Zeng] S;School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
关键词：
Rock dynamics;Damaged granite;Cyclic loading;SHPB;Constitutive model
摘要：
To study the influence of damage degree on dynamic characteristics of damaged rock mass, the samples with different damage degrees were obtained by cyclic loading test and then the impact failure test was carried out by a 100-mm diameter split Hopkinson pres-sure bar (SHPB) device. In addition, the Zhu-Wang-Tang (ZWT) constitutive model was improved to establish the dynamic constitutive model of damaged granite. Results show that when the cyclic upper limit stress (CULS) reached 60% of the compressive strength of rock mass, the Felicity effect was significant and the Kaiser effect basically disappeared. Furthermore, there was obvious compressive strengthening effect of damaged rock mass under impact load, with the increase of the CULS in the early stage, the dynamic compressive strength of granite samples showed an overall decreasing trend. The damage degree had a significant effect on the propagation and energy absorption ability of rock mass, thus affecting its failure characteristics. Eventually, the proposed constitutive model was fitted with the experimental data, which showed that the model could accurately describe the dynamic mechanical properties of damaged granite under impact load. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
期刊：
Nuclear Engineering and Technology,2023年55(2):566-574 ISSN：1738-5733
通讯作者：
Sheng Zeng
作者机构：
[Wang, Fulin; Zeng, Sheng; Song, Jiayin; Li, Hao; Shen, Yuan; Ye, Wenhao] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Sun, Bing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Sheng Zeng] S;School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China
关键词：
In situ leaching;Uranium-bearing sandstone;Seepage characteristics;Leaching solution viscosity;Seepage pressure
摘要：
Investigating the seepage characteristics of the leaching solution in the ore-bearing layer during the in situ leaching process can be useful for designing the process parameters for the uranium mining well. We prepared leaching solutions of four different viscosities and conducted experiments using a self -developed multifunctional uranium ore seepage test device. The effects of different viscosities of leaching solutions on the seepage characteristics of uranium-bearing sandstones were examined using seepage mechanics, physicochemical seepage theory, and dissolution erosion mechanism. Results indi-cated that while the seepage characteristics of various viscosities of leaching solutions were the same in rock samples with similar internal pore architectures, there were regular differences between the saturated and the unsaturated stages. In addition, the time required for the specimen to reach saturation varied with the viscosity of the leaching solution. The higher the viscosity of the solution, the slower the seepage flow from the unsaturated stage to the saturated stage. Furthermore, during the saturation stage, the seepage pressure of a leaching solution with a high viscosity was greater than that of a leaching solution with a low viscosity. However, the permeability coefficient of the high viscosity leaching so-lution was less than that of a low viscosity leaching solution.(c) 2022 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
作者机构：
[Liu, Xiqi; Wang, Gang] Wuhan Univ, Sch Civil Engn, Key Lab Geotech & Struct Engn Safety Hubei Prov, Wuhan 430070, Peoples R China.;[Liu, Xiqi; Wang, Gang; Song, Leibo] Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312099, Peoples R China.;[Hu, Rong] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Ma, Xiaoming] Huahui Engn Design Grp Co Ltd, Shaoxing 312000, Peoples R China.;[Zhong, Shiji; Ou, Xiaoping] China Gezhouba Grp No 1 Engn Co Ltd, Yichang 443000, Peoples R China.
通讯机构：
[Gang Wang] K;Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, China<&wdkj&>Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province, Shaoxing University, Shaoxing, China
关键词：
Rock mechanics;Fracture dip angle;Triaxial compression;Mechanical properties;Acoustic emission characteristics
摘要：
To study the influence of fracture dip angle on the mechanical properties and fracture evolution mechanism of granite under triaxial stress state, MTS 815 mechanics test system was used to conduct triaxial tests on granite with different fracture dip angles, and PCI-II acoustic emission (AE) system was used to monitor the whole process information. The results show that the brittle characteristics of fractured samples with 30 degrees, 45 degrees and 60 degrees dip angles are obviously weakened, while the plastic characteristics are enhanced. The fractures destroy the structural integrity of rock, resulting in the reduction of rock resistance to load and deformation. With the increase in fracture dip angles from 0 degrees to 90 degrees, the compressive strength and elastic modulus of rock samples show a nearly "U"-shaped changing trend of decreasing first and then increasing, and the deterioration ratio coefficients are 7.8 similar to 43.3% and 7.5 similar to 66.9%, respectively. Due to the difference of fracture dip angles, the failure of granite sample shows two modes: "through-cutting fracture surface failure" and "shear failure along fracture surface." It mainly depends on the angle between fracture surface and maximum principal stress. The fracture dip angle affects the variation law of AE signals during the fracture process. Especially for the fractured rock samples with 30 degrees, 45 degrees and 60 degrees dip angles, the AE ring count and energy show obvious "migration" phenomenon, and the signal concentration distribution area is widened and moved backward. With the increase in dip angle, the active degree of rock fracture decreases at first and then increases.
期刊：
Chemical Engineering Journal,2023年453:139924 ISSN：1385-8947
通讯作者：
Yang, Jianping(jianpingyang@dhu.edu.cn)
作者机构：
[Hua, Yilong; Li, Mi; Zou, Jinglan; Yang, Jianping; Zhang, Xiaowen; Wu, Xiaoyan; Li, Donghan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Hua, Yilong; Yang, Jianping] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.;[Hua, Yilong; Li, Mi; Zou, Jinglan; Wang, Wei; Zhang, Xiaowen; Wu, Xiaoyan; Li, Donghan] Univ South China, United Lab Heavy Met Pollut Control & Resource Reu, Hengyang 421001, Hunan, Peoples R China.;[Zhao, Guodong; Liu, Qing] Univ South China, Hunan Key Lab Pollut Control & Resource Reuse, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Wei-xian] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control, Shanghai 200092, Peoples R China.
通讯机构：
[Jianping Yang] S;School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
关键词：
Continuous flow stirred tank reactor;Eh control strategy;Nanoscale zero-valent iron;Uranium stability;Uranium wastewater
期刊：
Journal of Wind Engineering and Industrial Aerodynamics,2023年232:105244 ISSN：0167-6105
通讯作者：
William(Wei) Zhang
作者机构：
[Sun, Shiyan; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Sun, Shiyan; Wang, Hanqing] Univ South China, Hunan Prov Key Engn Lab Bldg Control Technol, Hengyang, Peoples R China.;[Sun, Shiyan; Zhang, William(Wei)] Univ South China, YangTze Delta Zhuji Res Inst, Zhuji, Zhejiang, Peoples R China.;[Zhang, William(Wei)] China Ind Dev Res Inst CIDRI, Ctr Sustainable Dev CSD, Shanghai, Peoples R China.;[Zhang, William(Wei)] HangZhou Long Beach Technol Ltd Co, Hangzhou, Zhejiang, Peoples R China.
通讯机构：
[William(Wei) Zhang] Y;YangTze Delta (Zhuji) Research Institute of University of South China, Zhuji, Zhejiang, PR China<&wdkj&>Center for Sustainable Development(CSD), China Industrial Development Research Institute (CIDRI), Shanghai, PR China<&wdkj&>HangZhou Long Beach Technology Ltd. Co, Binjiang, Hangzhou, Zhejiang, PR China
摘要：
In recent years, Large Eddy Simulation (LES) has been often used for predicting the pollutant diffusion around buildings. However, due to the numerical discretization error and the sub-grid scale modeling error, some empirical factors related to LES have not yet formed with completion for the best practice. This study focused on LES simulation of the airflow and pollutant diffusion around building with a synthetic inflow turbulence method and Wall-Adapting Local Eddy-Viscosity (WALE) model, discuss LES empirical factors, such as effects of grid resolution, sub-grid scale (SGS) WALE model with coefficient Cw and the sub-grid scale Schmidt number ScSGS in details. The results indicate that the numerical wind tunnel created by LES can better reproduce the charac-teristics of the airflow and concentration field around buildings while keeping predicted physical fields are in line with the evaluation index. In addition, the results also indicate that the solution with the finest grid resolution may not have the best agreement with the experimental data, the flow field is more sensitive to the change of SGS model coefficient Cw when the grid resolution is lower, which shows a trend that the larger coefficient Cw has better simulation in the windward sides of the building, while the value of the coefficient Cw shows an opposite trend in the recycling area at the rear of the building.
摘要：
To solve the problems of the poor stability and low adsorption efficiency of MXene used as an adsorbent for heavy metal removal. In this study, the microwave-assisted novel composite of chloroacetic acid-modified MXene-chitosan gel microspheres (C-TC-CS) was prepared. The experimental results demonstrated that C-TC-CS exhibited good stability and U(VI) adsorption performance, the maximum adsorption capacity of U(VI) by C-TC-CS was up to 141.96 mg/g. Pseudo-second-order and Langmuir isotherm adsorption models fit the adsorption process well, and the thermodynamic parameters showed that the adsorption process was spontaneous and endothermic. Importantly, C-TC-CS could be easily separated and regenerated. After five cycles of regeneration, the adsorption efficiency of C-TC-CS for U(VI) remained above 74%. Spectroscopic analyses indicated that the main adsorption mechanism involved electrostatic interactions, ion exchange, and complexation. This study proved that C-TC-CS could be an effective and promising adsorbent for removing U(VI) from aqueous solution.
摘要：
Investigating the seepage characteristics of acid leaching solution affected by surfactant in the ore-bearing layer during the in-situ leaching process can be useful for optimizing the process parameters of uranium ore. Three surfactant leaching solutions of different concentrations were prepared respectively for the agitation leaching experiment, from which the best was screened out for seepage simulation experiment using a self-developed multifunctional physical and chemical seepage test device. The influence of surfactant to seepage characteristics of leaching solution were examined based on the seepage flow mechanics and physicochemical seepage theory. Results indicated that trend of seepage characteristics of different leaching solutions were the same in rock samples with similar internal pore architectures in general, both of which were horizontal seepage processes from the unsaturated stage to the saturated stage. While the seepage process of leaching solution added surfactant reached the saturation point of the set flow rate earlier, and the addition of surfactant provided improvement in the permeability coefficient with the largest increase of 29.41% in the saturation stage, the growth of seepage pressure also decreased by up to 22.72%.
摘要：
Phosphorus-rich biochar (PBC) has been extensively studied due to its significant adsorption effect on U(VI). However, the release of phosphorus from PBC into solution decreases its adsorption performance and reusability and causes phosphorus pollution of water. In this study, Alcaligenes faecalis (A. faecalis) was loaded on PBC to produce a novel biocomposite (A/PBC). After adsorption equilibrium, phosphorus released into solution from PBC was 2.32mg/L, while it decreased to 0.34mg/L from A/PBC (p<0.05). The U(VI) removal ratio of A/PBC reached nearly 100%, which is 13.08% higher than that of PBC (p<0.05), and it decreased only by 1.98% after 5 cycles. When preparing A/PBC, A. faecalis converted soluble phosphate into insoluble metaphosphate minerals and extracellular polymeric substances (EPS). And A. faecalis cells accumulated through these metabolites and formed biofilm attached to the PBC surface. The adsorption of metal cations on phosphate further contributed to phosphorus fixation in the biofilm. During U(VI) adsorption by A/PBC, A. faecalis synthesize EPS and metaphosphate minerals by using the internal components of PBC, thus increasing the abundance of acidic functional groups and promoting U(VI) adsorption. Hence, A/PBC can be a green and sustainable material for U(VI) removal from wastewater.
摘要：
Hollow microspheres Bi2WO6 (HBWO) were prepared by the solvothermal method for the adsorption of U(VI) from aqueous solutions. Batch experiments and characterization analysis investigated the adsorption performance and mechanism. The results showed that the adsorption equilibrium could be reached in 30 min at T = 303 K, pH = 6, C-U(VI) = 10 mg/L, m/V = 0.1 g/L. The removal efficiency of HBWO for U(VI) in solution was 95.53%, which was about 20% higher than Bi2WO6 nanosheets. The maximum Langmuir adsorption capacity could reach 523.13 mg/g. FTIR and XPS analysis indicated that the interaction mechanism of U(VI) with HBWO is mainly surface complexation of strong ionic bond (M-O) and hydroxyl (-OH) groups. In addition, HBWO has strong ion selectivity for U(VI) and good regeneration and reuse performance. These results demonstrated that HBWO might potentially remediate actual uranium-containing wastewater.
通讯机构：
[Xie, D ] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
关键词：
Obesity and overweight;Environmental chamber experiments;Thermal comfort during indoor running;Subjective votes;Physiological indexes
摘要：
Regular and adequate physical exercise plays a pivotal role in enhancing physical fitness, mitigating the occurrence of obesity, and upholding body weight. The comfort of individuals engaging in exercise is significantly impacted by various environmental factors within sports fields, including ambient temperature, humidity, air velocity, and mean radiant temperature. To investigate the influence of ambient temperature, relative humidity, and body mass index (BMI) on the comfort levels of individuals with high body fat during exercise, treadmill running experiments were conducted within controlled environmental chambers. Furthermore, the subjects' subjective sensations and physiological indexes were recorded. The results implied that subjects exhibited a broader range of acceptable thermal sensations during exercise compared to rest periods. Moreover, individuals with a higher BMI displayed heightened sensitivity to elevated temperatures and a greater propensity for perceiving sensations of heat, resulting in a narrower range of acceptable exercise conditions. Additionally, the findings highlighted that air temperature exerted a more pronounced impact on comfort levels than humidity. For indoor running exercises, it was advisable to maintain ambient temperatures within the ranges of 15.1 degrees C-24.3 degrees C and 16.1 degrees C-27.8 degrees C for obese and overweight individuals, respectively. Furthermore, it was recommended to maintain a relative humidity level between 50% and 80% in the exercise environment.
作者机构：
[Qiao, Jiaxing; Liu, Xiqi; Wang, Gang; Song, Leibo] Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312000, Peoples R China.;[Ma, Xiaoming] Huahui Engn Design Grp Co Ltd, Shaoxing 312000, Peoples R China.;[Chen, Wenzhao] Univ South China, Sch Civil Engn, Hengyang 421000, Peoples R China.
通讯机构：
[Wang, G ] S;Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312000, Peoples R China.
摘要：
The tailings pond is a dangerous source of man-made debris flow with high potential energy. The oxidative acidification of tailings may cause the instability of the pond and induce serious safety accidents. The influence of oxidation and acidification degree on macro mechanical properties of tailings is discussed from the aspects of mineral composition and microstructure. The results show that as the degree of oxidation and acidification of tailings sand increases, the overall structural performance and load-bearing capacity decrease, and its cohesion (c) and internal friction angle (φ) show a decreasing trend. In fact, the engineering properties of tailings with different oxidation and acidification degrees are dominated by the physicochemical composition and structural characteristics. On the one hand, as the degree of oxidation increases, acidic substance will neutralize with CaCO(3) and CaMg(CO(3))(2), resulting in the loss of cemented substance and the decrease of cementation force between tailing sand particles as well as the gradual destruction of the integrity of tailing sand. On the other hand, the increase of oxidation and acidification degree of tailing sand leads to a gradual reduction of outline (2D) fractal dimension and gray surface (3D) fractal dimension of surface laminated structure as well as the obvious reduction of laminated structure and its roughness of tailings sand.
摘要：
Tetracycline (TC) is an important antibiotic extensively used in livestock breeding and aquaculture, and so an effective removal strategy is urgently needed. This study explores the use of a series of hydroxyapatite calcinated at different temperatures (300, 400, 500, 600, and 700 degrees C) to activate peroxymonosulfate (PMS) for the removal of TC. The optimal conditions for the removal of 10 mg/L TC using hydroxyapatite calcinated at 600 degrees C (CHAP600) as a catalyst were determined to be: pH of 6.0, a catalyst dosage of 0.2 g/L and a PMS concentration of 0.3 mM. Under these conditions, the removal efficiency of TC reached 94 %. The potential degradation pathway of TC was proposed by identifying the intermediates using High Performance Liquid Chromatography/ Triple Quad mass spectrometry. The characterization analysis revealed that the presence of calcium carbonate on the surface of CHAP600 promoted the generation of singlet oxygen (1O2). Additionally, the phosphate group in CHAP600 served as a catalyst for the production of sulfate radicals (SO4 & BULL;-) from PMS, which subsequently react with hydroxyl or surface hydroxyl group to generate hydroxyl radicals (& BULL;OH). And the active species 1O2 is the most significant contributor to the catalytic degradation process of TC by CHAP600 activated PMS, followed by & BULL;OH, and then SO4 & BULL;-. This study provides new insight for the mechanism of removing organic contaminants using PMS activated with calcined hydroxyapatite.
摘要：
In this work, AgBr/LaFeO3 (ALFO) Z-scheme heterojunction photocatalyst was successfully synthesized by simple in-situ precipitation method, and photocatalysis was coupled with peroxymonosulfate (PMS) to remove acid orange 7 (AO7) by enhanced electron transfer. The Z-scheme heterojunction between AgBr and LaFeO3 provides the driving force for charge transfer and improves the charge separation rate. At the same time, PMS can act as an electron acceptor to promote photogenerated charge separation and maximize the generation of reactive oxygen species. The obtained results showed that the prepared ALFO photocatalyst has excellent reusability and excellent AO7 removal efficiency. This work successfully demonstrated the synergistic effect of ALFO photocatalyst, promoted light utilization and PMS activation, and provided a potential application prospect for effectively reducing environmental pollution by using solar energy.
期刊：
Journal of Building Engineering,2023年72:106503 ISSN：2352-7102
通讯作者：
Xie, D
作者机构：
[Zhang, Zixuan; Xie, D; Xie, Dong; Zhou, Lifeng; Wang, Lize] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Zhang, Zixuan; Xie, Dong; Zhou, Lifeng; Wang, Lize] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.
通讯机构：
[Xie, D ] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
关键词：
Building energy prediction;Bi-directional gated recurrent unit;Convolution neural network;Attention mechanism;Residual connection
摘要：
Accurate building energy consumption prediction is crucial to the rational planning of building energy systems. The energy consumption of buildings is influenced by various elements and is characterized by non-linearity and non-stationarity. To fully tap the time series characteristics of building energy consumption and heighten the model's prediction accuracy, this paper proposes a hybrid neural network prediction model combining attention mechanism, Bidirectional Gate Recurrent Unit (BiGRU), Convolutional Neural Networks (CNN), and the residual connection. The model uses BiGRU to train the extracted feature vectors by CNN on a two-way cycle. The attention mechanism highlights the key information extracted, and the residual connection is used to learn the features fully. Taking the energy consumption data of an office building in Guangzhou, China, as the object of study, the results indicate that the proposed model shows a stronger prediction accuracy than the commonly used model with an R2 of 90.74% and a CV-RMSE of 19.24%. Compared with the other five common models, the RMSE, MAPE, and MAE of the proposed model achieve lower error rates. Besides, the length 24 of the sliding window exceeds other lengths in the established model. The prediction accuracy of the established model in working hours outperforms the non-working hours of the office building. Building energy consumption prediction in the same season is better than that in the whole year.
期刊：
Indoor and Built Environment,2023年32(10):2034-2049 ISSN：1420-326X
通讯作者：
Li, CJ;Yu, CW
作者机构：
[Wang, Chenhua] Tianjin Univ, Sch Environm Sci & Engn, Tianjin, Peoples R China.;[Wang, Chenhua; Wang, Hanqing; Yu, Chuck W.; Li, Chengjun] Univ South China, Natl & Local Joint Engn Res Ctr forAirborne Pollut, Sch Civil Engn, Hengyang, Peoples R China.;[Wang, Hanqing; Li, Chengjun] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.;[Wang, Hanqing; Li, Chengjun] Hunan Engn Res Ctr Full Life cycle Energy efficien, Changsha, Hunan, Peoples R China.;[Yu, Chuck W.] Int Soc Built Environm ISBE, Milton Keynes, England.
通讯机构：
[Yu, CW ] I;[Li, CJ ] C;Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.;Int Soc Built Environm ISBE, Milton Keynes, England.
关键词：
Air purifier;Airborne transmission;Computational fluid dynamics;COVID virus;Risk mitigation;Ventilation parameters
摘要：
Indoor and Built Environment, Volume 32, Issue 10, Page 2034-2049, December 2023. <br/>This study evaluated the effect of ventilation rate and air supply angle of an air purifier using computational fluid dynamics to determine the dispersion of airborne COVID virus exhaled by an infected person. The risk of infection for an occupant was determined based on the virus concentration in the active area and accumulated particle dose within the breathing zone by varying the ventilation parameters. The air purifier was found to provide a local dilution and would block the development of an expiratory jet for a short time to reduce transmission risk. Compared to the case without an air purifier, the maximum reductions were 94.27% in the accumulated dose and 53.2% in the particle count concentration. In the breathing area, the larger air supply angle (90° > 60° > 30°) is better when the ventilation rate was 27.0 m3/h and 40.5 m3/h. Otherwise, 60° air supply angle is preferable where the ventilation rate was 54.0 m3/h. Assessing the results with the grey relational analysis revealed that the relational degree for particle count concentration was greater by varying the ventilation rate than by varying the air supply angle. However, the relational degree according to the accumulated dose was greater by varying the air supply angle than by increasing the ventilation rate. These findings may provide an important control strategy to effectively mitigate the risk of infection in a confined room by using an air purifier.
