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In-situ synthesis of Z-scheme CeO_(2)@WO_(3) heterojunction with aromatic rings as electron medium for efficient photocatalytic degradation of perfluorobutane sulfonate

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Journal of Rare Earths 2025年第3期43卷 470-479,I0002页

作者： Shihai Cao Haocheng Yang Cheng Cheng Jinheng Dai Shuaishuai Lu Yao Lu College of Environmental Engineering Nanjing Institute of TechnologyNanjing211167China Jiangsu Environmental Engineering Technology Co. Ltd.Nanjing210019China Key Laboratory of Jjiangsu Province for Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing210094China School of Environment and Safety Engineering School of Emergency ManagementInstitute of Environment and EcologyJiangsu UniversityZhenjiang 212013China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou215009China

Photocatalytic technology has been proven to be a simple and effective method for degrading recalcitrant organic *** this study,a series of Z-scheme heterojunction nanocomposites composed of CeO_(2)and terephthalic acid-modified WO_(3) was prepared and further used as photocatalysts for perfluorobutane sulfonate(PFBS)*** this design,terephthalic acid was used as an electron recombination center and heterojunction mediator,which effectively enhances the migration ability of electron-hole pairs and the physicochemical stability of the *** addition,in situ synthesis of CeO_(2)onto the WO_(3) surface by the coordinate bond between terephthalic acid and Ce ions can avoid CeO_(2)*** a result,the CeO_(2)@WO_(3) photocatalyst exhibits excellent PFBS degradation ability(94%for CeO_(2)@WO_(3) vs.19%for CeO_(2)).After the fifth cyclic degradation experiment,the CeO_(2)@WO_(3) photocatalyst still maintains stable degradation ***,the reaction mechanism of the PFBS in CeO_(2)@WO_(3) photocatalytic process was analyzed by free radical trapping experiment and liquid chromatography tandem mass spectrometry(LC-MS)*** study provides new insights for constructing Z-scheme heterojunction and demonstrates that CeO_(2)@WO_(3) photocatalysts possess a promising prospect for degrading PFBS pollutants.

关键词： CeO_(2) WO_(3) Photocatalytic Z-Scheme heterojunction Perfluorobutane sulfonate(PFBS) Rare earths

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Hydrogenation of zircaloy-4 in a defective fuel pellet for pressurized water reactors 29

Hydrogenation of zircaloy-4 in a defective fuel pellet for p...

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2022 29th International Conference on Nuclear engineering, ICONE 2022

作者： Enivweru, Doctor Wang, Qingyu Ayodeji, Abiodun Njoroge, John College of Nuclear Science and Technology Harbin Engineering University China Nigeria Atomic Energy Commission Abuja Nigeria State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University China

ISBN: (纸本)9780791886366

The integrity of structural components is a major concern in reactor safety. Cladding materials can fail when hydrogen uptake is in excess of the terminal solid solubility (TSS). Previous studies on hydrogenation or secondary hydriding (SH) focused mainly on loss of coolant accident (LOCA) and fuel ballooning. Most of these studies are carried out in autoclave conditions and they preclude the contribution of ionizing radiations (neutrons and gamma) to hydrogen generation during normal reactor condition. This study is devoted to the hydrogenation of Zircaloy-4 (Zry-4) cladding material during normal reactor operation and during the early phase of core degradation in a LOCA event. Radiolysis and corrosion are considered as hydrogen sources during normal reactor operation while corrosion is considered in the early phase of core degradation. Using appropriate initial and boundary conditions peculiar to pressurized water reactors (PWRs), diffusion equation is solved in a defective Zry-4 fuel system using COMSOL Multiphysics 5.2. Results show that the average corrosive source term (1.279E-4 mol m-3 s-1) is higher than the radiolytic source term (3.6594E-7 mol m-3 s-1) by a factor of 350 during normal reactor operation. By integrating in two kinetics regimes and setting 6 years as the maximum lifetime of Zry-4, the amount of H dissolved in the cladding material at a temperature of 633 K are 6.54E-03 and 2.02 wt. ppm due to radiolysis and corrosion respectively. These values are safe compared to the TSS of dissolution of Zry-4 which is 117 wt. ppm at the same referenced temperature. However, in the early phase of core degradation where the source term is 9.405E-01 mol m-3 s-1, SH is observed in 13 days. A comparison is made between hydrogenation by integration in two regimes and hydrogenation using Sievert s law. The results obtained in this study are useful for the prediction of the onset of hydrogen embrittlement, and to determine the service time of Zry-4 cladding materi

关键词： Radiolysis

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Location-dependent effect of nickel on hydrogen dissociation and diffusion on Mg(0001)surface:Insights into hydrogen storage material design

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Journal of Magnesium and Alloys 2022年第6期10卷 1617-1630页

作者： Zongying Han Yayun Wu Hao Yu Shixue Zhou College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Density functional theory(DFT)calculations have been performed to investigate the hydrogen dissociation and diffusion on Mg(0001)surface with Ni incorporating at various *** results show that Ni atom is preferentially located inside Mg matrix rather than in/over the topmost *** calculations reveal that Ni atom locating in/over the topmost Mg(0001)surface exhibits excellent catalytic effect on hydrogen dissociation with an energy barrier of less than 0.05 *** these cases,the rate-limiting step has been converted from hydrogen dissociation to surface *** contrast,Ni doping inside Mg bulk not only does little help to hydrogen dissociation but also exhibits detrimental effect on hydrogen ***,it is crucial to stabilize the Ni atom on the surface or in the topmost layer of Mg(0001)surface to maintain its catalytic *** all the case of Ni-incorporated Mg(0001)surfaces,the hydrogen atom prefers firstly immigrate along the surface and then penetrate into the *** is expected that the theoretical findings in the present study could offer fundamental guidance to future designing on efficient Mg-based hydrogen storage materials.

关键词： Hydrogen storage Hydrogen dissociation Ni incorporation Hydrogen diffusion Mg

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A multi-fidelity prediction model for vertical bending moment and total longitudinal stress of a ship based on composite neural network

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Journal of Hydrodynamics 2023年第1期35卷 27-35页

作者： Cai-xia Jiang Yu-bo Liu Zi-yuan Wang Shuai Chen Sheng-ze Cai Qi Gao Xue-ming Shao Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of TechnologyHarbin150001China China Ship Scientific Research Center Wuxi214082China School of Aeronautics and Astronautics Zhejiang UniversityHangzhou310027China College of Control Science and Engineering Zhejiang UniversityHangzhou310027China

In ship engineering,the prediction of vertical bending moment(VBM)and total longitudinal stress(TLS)during ship navigation is of utmost *** this work,we propose a new prediction paradigm,the multi-fidelity regression model based on multi-fidelity data and artificial neural network(MF-ANN).Specifically,an ANN is used to learn the fundamental physical laws from low-fidelity data and construct an initial input-output *** predicted values of this initial model are of low accuracy,and then the high-fidelity data are utilized to establish a correction model that can correct the low-fidelity prediction ***,the overall accuracy of prediction can be improved *** feasibility of the multi-fidelity regression model is demonstrated by predicting the VBM,and the robustness of the model is evaluated at the same *** prediction of TLS on the deck indicates that just a small amount of high-fidelity data can make the prediction accuracy reach a high level,which further illustrates the validity of the proposed MF-ANN.

关键词： Artificial neural network multi-fidelity vertical bending moment total longitudinal stress

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Intelligent monitoring and control system for molten metal drop-on-demand jetting by water-hammer effect

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Precision engineering 2025年 96卷 134-146页

作者： Boce Xue Yanzhen Zhang Yuyao Wu Guofang Hu Zihao Li Weiwei He Mingyu Yan Runsheng Li Xiao-Yu Tang College of Mechanical and Electronic Engineering China University of Petroleum (East China) Qingdao 266580 China State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou 310027 China

The molten metal drop-on-demand (DoD) jetting technology holds great potential for applications in fields such as electronics manufacturing and metal additive manufacturing. To ensure the stability and reliability of droplet quality, monitoring the jetting system state and controlling the jetting process are essential. However, existing studies primarily focus on conventional ink rather than molten metal, while monitoring the jetting system state and controlling the jetting process remain unintegrated. This study develops an integrated intelligent monitoring and control system for a self-developed water-hammer-based molten metal DoD jetting system. Firstly, the geometric features of droplets are collected and analyzed under varying liquid level heights and different driving waveform parameters. Subsequently, a jetting simulation model is established, and then it is used for sampling to train a prediction model for droplet volume reachable range, which can be used to monitor the state of the jetting system. Next, a multi-objective molten droplet control system is designed based on deep reinforcement learning, enabling the control system to simultaneously regulate the droplet volume and shape. Finally, simulations and experiments are conducted on the developed monitoring and control system. The results demonstrate that the monitoring system can accurately determine the current state of the liquid level. Furthermore, under normal liquid level height, the control system can achieve precise and rapid control over both the droplet volume and shape. This study contributes to improving the production quality of molten metal DoD jetting systems.

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Deep Learning Based Signal Detector for OFDM Systems

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China Communications 2023年第12期20卷 66-77页

作者： Guangliang Pan Wei Wang Minglei Li Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information TechnologyCollege of Electronic and Information EngineeringNanjing University of Aeronautics and AstronauticsNanjing 211106China College of Control Science and Engineering China University of Petroleum(East China)Qingdao 266580China

In this paper,we propose a novel deep learning(DL)-based receiver design for orthogonal frequency division multiplexing(OFDM)*** entire process of channel estimation,equalization,and signal detection is replaced by a neural network(NN),and hence,the detector is called a NN detector(N^(2)D).First,an OFDM signal model is *** analyze both temporal and spectral characteristics of OFDM signals,which are the motivation for ***,the generated data based on the simulation of channel statistics is used for offline training of bi-directional long short-term memory(Bi-LSTM)***,a discriminator(F)is added to the input of Bi-LSTM NN to look for subcarrier transmission data with optimal channel gain(OCG),which can greatly improve the performance of the ***,the trained N^(2)D is used for online recovery of OFDM *** performance of the proposed N^(2)D is analyzed theoretically in terms of bit error rate(BER)by Monte Carlo simulation under different parameter *** simulation results demonstrate that the BER of N^(2)D is obviously lower than other algorithms,especially at high signal-to-noise ratios(SNRs).Meanwhile,the proposed N^(2)D is robust to the fluctuation of parameter values.

关键词： channel estimation deep learning OFDM optimal channel gain signal detection

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Synergistic Cu single-atoms and clusters on tubular carbon nitride for efficient photocatalytic performances

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Rare Metals 2024年第11期43卷 5891-5904页

作者： Yu-Xiao Feng Hui-Jun Yu Tian-Guang Lu Zi-Ye Zheng Shuang Tian Li Xiang Shan Zhao Shu-Guang Wang Zuo-Li He Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Weihai Research Institute of Industrial Technology of Shandong University Shandong UniversityWeihai 264209China School of Electrical Engineering Shandong UniversityJinan 250061China CEDAR Knight Cancer InstituteSchool of MedicineOregon Health and Science UniversityPortland 97201USA

Metal clusters or even single-atoms dispersed and anchored on the photocatalysts'surface can enhance photocatalytic performances on organic pollutant ***,a simple photoreduction method was used to create atomically dispersed metal single-atoms/clusters(MSCs,M=Cu,Pd,Au and Ag)on P-modulated tubular carbon nitride(TCN).The obtained MSCs@TCN demonstrated excellent photocatalytic performances for the degradation of sulfamethazine(SMZ).In particular,the photocatalyst with 2 wt%Cu loading showed ultrahigh SMZ oxidation efficiency(k=0.06110 min^(-1)),almost three times that of TCN(k=0.02066 min^(-1)).It also shows excellent stability in the 5th-cycle *** improved photocatalytic activity of the CuSCs@TCN is ascribed to the synergistic promotion of photogenerated charge separation by Cu single-atoms/clusters as active sites,accelerated charge transfer from bulk TCN to Cu sites through Cu-N_(x)***,the active sites of Cu single-atoms/clusters could promote the production of·O_(2)^(-),which participates in organic oxidation with strong oxidizing holes(h^(+)).This strategy paves a new avenue for designing high-performance photocatalysts decorated with metal single-atoms and clusters.

关键词： Carbon nitride Photocatalysis Cu single-atom Sulfamethazine Degradation

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Analysis of diffusion behavior of harmful emissions from trackless rubber-wheel diesel vehicles in underground coal mines

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International Journal of Mining science and technology 2022年第6期32卷 1285-1299页

作者： Yun Hua Wen Nie Qiang Liu Xiaofei Liu Chengyi Liu Weiwei Zhou Fengning Yu College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

To define the diffusion behavior of harmful exhaust substances from diesel vehicles and support safety risk assessments of underground coal mines,we performed a multi-species coupling calculation of the emission and diffusion of harmful substances from a trackless rubber-wheel diesel vehicle.A computational fluid dynamics(CFD)model of the diffusion of harmful emissions was hence established and *** the perspective of risk analysis,the diffusion behavior and distribution of hazardous substances emitted by the diesel vehicle were studied under 4 different conditions;moreover,we identified areas characterized by hazardous levels of *** the vehicle idled upwind in the roadway,high-risk areas formed behind and to the right of the vehicle:particularly high concentrations of pollutants were measured near the rear floor of the vehicle and within 5 m behind the *** the vehicle idled downwind,high-risk areas formed in front of it:particularly high concentrations of pollutants were measured near the floor and within 5 m from the front of the *** the above cases,the driver would not breathe highly polluted air and would be relatively *** the vehicle idled into the chamber,however,high-risk areas formed on both sides of the vehicle and near the upper *** entry of the vehicle caused a greater increase in the concentration of pollutants in the chamber and in the driver’s breathing zone compared with reverse entry.

关键词： Diesel vehicle Harmful emissions Diffusion behavior CFD model Underground coal mine

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A critical review of on-site inorganic arsenic screening methods

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Journal of Environmental sciences 2023年第3期125卷 453-469页

作者： Yi He Jingyu Liu Yanhua Duan Xiaofei Yuan Lulu Ma Ratan Dhar Yan Zheng Department of Sciences John Jay College and the Graduate CenterThe City University of New YorkNY 10019USA State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Queensland Alliance for Environmental Health Sciences(QAEHS) The University of QueenslandQLD 4102Australia Department of Earth and Physical Sciences York CollegeThe City University of New YorkNY 11451USA

Approximately 94 to 220 million people worldwide are at risk of drinking well water containing arsenic > 10 μg/L, the WHO guideline value. To identify non-compliant domestic wells, assess health risks and reduce exposure, accurate and rapid on-site inorganic arsenic screening methods are desirable because all domestic wells worldwide need to be ***, the principles, advantages and limitations of commonly used colorimetry, electrochemistry, and biosensing methods are critically reviewed, with the performance compared with laboratory-based benchmark methods. Most commercial kits are based on the classic Gutzeit reaction. Despite being semi-quantitative, the more recent and more expensive products display improved and acceptable accuracy and shorter testing time (~10 min). Carried out by trained professionals, electrochemical methods are also feasible for on-site analysis, although miniaturization is desirable yet challenging. Biosensing using whole bacterial cells or bio-engineered materials such as aptamers is promising, if incorporated with function specific nanomaterials and biomaterials. Since arsenic is frequently found as arsenite in reducing groundwater and subject to oxidation during sampling, transportation and storage, on-site separation and sample preservation are feasible but the specific methods should be chosen based on sample matrix and tested before use. To eliminate arsenic exposure among hundreds of millions of mostly rural residents worldwide, we call for concerted efforts in research community and regulatory authority to develop accurate, rapid, and affordable tests for on-site screening and monitoring of arsenic in drinking water. Access to affordable testing will benefit people who are socioeconomically disadvantaged.

关键词： Inorganic arsenic On-site analysis Drinking water Groundwater Field test

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Ultrasonic vibration-assisted multi-scale plastic forming of high-entropy alloys in milliseconds

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Rare Metals 2023年第4期42卷 1146-1153页

作者： Wen-Xin Wen Lu-Yao Li Zhen Li Wen-Qing Ruan Shuai Ren Zhen-Xuan Zhang Xiong Liang Huan Liu Jiang Ma Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen518055China College of Mechanics and Materials Hohai UniversityNanjing210000China

Due to their excellent properties of specific strength,fracture resistance,corrosion and oxidation resistance,the high-entropy alloys have attracted widespread attention as engineering *** the sake of industrial applications,one of the essential stages would be the forming of them,especially the construction of multi-sc ale structures from macroscale to nanoscale.

关键词： alloys materials. resistance

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