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Graphene-confined ultrafast radiant heating for high-loading subnanometer metal cluster catalysts

national science Review 2023年第6期10卷 191-199页

作者： Ye-Chuang Han Jun Yi Beibei Pang Ning Wang Xu-Cheng Li Tao Yao Kostya S.Novoselov Zhong-Qun Tian State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Graphene Industry and Engineering Research Institute School of Electronic Science and Engineering Xiamen University Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) National Synchrotron Radiation Laboratory University of Science and Technology of China Faculty of Environment and Life Beijing University of Technology Institute for Functional Intelligent Materials National University of Singapore

Thermally activated ultrafast diffusion,collision and combination of metal atoms comprise the fundamental processes of synthesizing burgeoning subnanometer metal clusters for diverse ***,so far,no method has allowed the kinetically controllable synthesis of subnanometer metal clusters without compromising metal ***,we have developed,for the first time,a graphene-confined ultrafast radiant heating(GCURH) method for the synthesis of high-loading metal cluster catalysts in microseconds,where the impermeable and flexible graphene acts as a diffusion-constrained nanoreactor for high-temperature *** from graphene-mediated ultrafast and efficient laser-to-thermal conversion,the GCURH method is capable of providing a record-high heating and cooling rate of～10～9℃/s and a peak temperature above 2000 ℃,and the diffusion of thermally activated atoms is spatially limited within the confinement of the graphene *** a result,due to the kinetics-dominant and diffusion-constrained condition provided by GCURH,subnanometer Co cluster catalysts with high metal loading up to 27.1 wt% have been synthesized by pyrolyzing a Co-based metal-organic framework(MOF)in microseconds,representing one of the highest size-loading combinations and the quickest rate for MOF pyrolysis in the reported *** obtained Co cluster catalyst not only exhibits an extraordinary activity similar to that of most modern multicomponent noble metal counterparts in the electro catalytic oxygen evolution reaction,but is also highly convenient for catalyst recycling and refining due to its single metal *** a novel GCURH technique paves the way for the kinetically regulated,limited diffusion distance of thermally activated atoms,which in turn provides enormous opportunities for the development of sophisticated and environmentally sustainable metal cluster catalysts.

关键词： photothermal conversion ultrafast radiant heating graphene-confined high-loading metal clusters solid catalysts

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Photoreduction adjusted surface oxygen vacancy of Bi_(2)MoO_(6) for boosting photocatalytic redox performance

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Frontiers of Chemical science and engineering 2023年第12期17卷 1937-1948页

作者： Tie Shi Hailong Jia Yanmei Feng Bo Gong Daimei Chen Yu Liang Hao Ding Kai Chen Derek Hao Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Science and Technology Shenyang University of Chemical TechnologyShenyang 110142China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoringand Pollution Control School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)NSW 2007Australia

In this study, Bi_(2)MoO_(6) with adjustable rich oxygen vacancies was prepared by a novel and simple solvothermal-photoreduction method which might be suitable for a large-scale production. The experiment results show that Bi_(2)MoO_(6) with rich oxygen vacancies is an excellent photocatalyst. The photocatalytic ability of BMO-10 is 0.3 and 3.5 times higher than that of the pristine Bi_(2)MoO_(6) for Rhodamine B degradation and Cr(VI) reduction, respectively. The results display that the band energy of the samples with oxygen vacancies was narrowed and the light absorption was broadened. Meanwhile, the efficiency of photogenerated electron-holes was increased and the separation and transfer speed of photogenerated carriers were improved. Therefore, this work provides a convenient and efficient method to prepare potential adjustable oxygen vacancy based photocatalysts to eliminate the pollution of dyes and Cr(VI) in water.

关键词： Bi_(2)MoO_(6) oxygen vacancies photoreduction Cr(VI) RhB

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The degradation of perovskite precursor

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Journal of Semiconductors 2023年第10期44卷 3-6页

作者： Mengjia Li Lixiu Zhang Cong Chen Jiangzhao Chen Liming Ding State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Key Laboratory of Optoelectronic Technology&Systems(MoE) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Macao Institute of Materials Science and Engineering(MIMSE) Macao University of Science and TechnologyMacao 999078China

Perovskite solar cells(PSCs)are taking a leading position in thin-film optoelectronic devices due to their excellent optical,physical and electrical properties[1-4].Nevertheless,the stability issue of metal halide perovskite precursor solution severely retards the future industrialization of PSCs[5-7].In stoichiometry,slight solution composition change will induce severe degradation of device performance.

关键词： perovskite halide film

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Scientific objectives and payload configuration of the Chang'E-7 mission

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national science Review 2024年第2期11卷 285-300页

作者： Chi Wang Yingzhuo Jia Changbin Xue Yangting Lin Jianzhong Liu Xiaohui Fu Lin Xu Yun Huang Yufen Zhao Yigang Xu Rui Gao Yong Wei Yuhua Tang Dengyun Yu Yongliao Zou State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences National Space Science Center Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geochemistry Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space SciencesShandong University Institute of Drug Discovery Technology Ningbo University State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Engineering Sun Yat-sen University Lunar Exploration and Space Engineering Center China Aerospace Science and Technology Corporation

As the cornerstone mission of the fourth phase of the Chinese Lunar Exploration Program, Chang'E-7(CE-7) was officially approved, and implementation started in 2022, including a main probe and a communication relay satellite. The main probe, consisting of an orbiter, a lander, a rover and a mini-flying probe, is scheduled to be launched in 2026. The lander will land on Shackleton crater's illuminated rim near the lunar south pole, along with the rover and mini-flying probe. The relay satellite(named Queqiao-2) will be launched in February 2024 as an independent mission to support relay communication during scientific exploration undertaken by Chang'E-4, the upcoming Chang'E-6 in 2024 and subsequent lunar *** CE-7 mission is mainly aimed at scientific and resource exploration of the lunar south pole. We present CE-7's scientific objectives, the scientific payloads configuration and the main functions for each scientific payload with its key technical specifications.

关键词： Chang’ E-7 scientific objectives scientific payloads

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Improving hole transfer of boron nitride quantum dots modified PDI for efficient photodegradation

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Frontiers of Chemical science and engineering 2023年第11期17卷 1718-1727页

作者： Shiqing Ma Chundong Peng Zeyu Jia Yanmei Feng Kai Chen Hao Ding Daimei Chen Zhong-Yong Yuan Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Material Sciences and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Science and Engineering Nankai UniversityTianjin 300350China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoringand Pollution Control School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China

In recent years,organic photocatalyst under visible-light absorption has shown significant potential for solving environmental ***,it is still a great challenge for constructing a highly active organic photocatalyst due to the low separation efficiency of photogenerated ***,an effective and robust photocatalyst perylene-3,4,9,10-tetracarboxylic diamide/boron nitride quantum dots(PDI/BNQDs),consisting of selfassemble PDI withπ–πstacking structure and BNQDs,has been constructed and researched under visible light *** PDI/BNQDs composite gradually increases organic pollutant photodegradation with the loading amount of *** 10 mL of BNQDs solution added(PDI/BNQDs-10),the organic pollutant photodegradation performance reaches a maximum,about 6.16 times higher with methylene blue and 1.68 times higher with ciprofloxacin than that of pure PDI *** enhancement is attributed to improved separation of photogenerated carriers from self-assembled PDI by BNQDs due to their preeminent ability to extract *** work is significant for the supplement of PDI supramolecular composite *** believe that this photocatalytic design is capable of expanding organic semiconductors’potential for their applications in photocatalysis.

关键词： PDI boron nitride quantum dots photocatalysis hole transfer

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Pumping and sliding of droplets steered by a hydrogel pattern for atmospheric water harvesting

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national science Review 2023年第12期10卷 181-192页

作者： Wei Zhang Qinghua Ji Gong Zhang Zhenao Gu Haozhi Wang Chengzhi Hu Huijuan Liu Zhiyong Jason Ren Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of Environment Tsinghua University Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin University Department of Civil and Environmental Engineering and Andlinger Center for Energy and the Environment Princeton University

Atmospheric water harvesting is an emerging strategy for decentralized and potable water supplies. However,water nucleation and microdroplet coalescence on condensing surfaces often result in surface flooding owing to the lack of a sufficient directional driving force for shedding. Herein, inspired by the fascinating properties of lizards and catfish, we present a condensing surface with engineered hydrogel patterns that enable rapid and sustainable water harvesting through the directional pumping and drag-reduced sliding of water droplets. The movement of microscale condensed droplets is synergistically driven by the surface energy gradient and difference in Laplace pressure induced by the arch hydrogel patterns. Meanwhile, the superhydrophilic hydrogel surface can strongly bond inner-layer water molecules to form a lubricant film that reduces drag and facilitates the sliding of droplets off the condensing surface. Thus, this strategy is promising for various water purification techniques based on liquid–vapor phase-change processes.

关键词： atmospheric water harvesting droplet manipulation bio-inspired condensation

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Assessing GNSS hydrological monitoring capability across different climatic settings in China

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Geodesy and Geodynamics 2025年第2期16卷 147-157页

作者： Qingwen Huang Lilong Liu Chaolong Yao Si Xiong Liangke Huang Tengxu Zhang College of Geomatics and Geoinformation Guilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Spatial Information and Geomatics Guilin 541004China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510640China National Precise Gravity Measurement Facility Huazhong University of Science and TechnologyWuhan 430074China School of Resources and Environment Science and Engineering Hubei University of Science and TechnologyXianning 437100China

Vertical position changes of ground-based Global Navigation Satellite System(GNsS)stations have been used to study regional terrestrial water storage(TwS)***,the feasibility is still unclear in many areas due to diverse local *** study aims to evaluate the capability of GNsS vertical displacements in monitoring hydrological variations in four climate settings over Chinese *** spatial and temporal variations of hydrological load-induced(HYDL)vertical displacements at 208 GNSS sites during 2011-2020 were analyzed by comparing with Gravity Recovery and Climate Experiment(GRACE)/GRACE Follow-On(GFO)and Global Land Data Assimilation System(GLDAS)derived TWS *** results indicate that GNsS vertical positions show different capabilities in capturing seasonal and non-seasonal hydrological dynamics in different climate *** the four climatic settings,the subtropical monsoon climate(SMC)region,with the largest deformation fluctuation(the regional mean root mean square(RMS)is 7.97 mm),has the highest regional mean HYDL-GRACE and HYDL-GLDAS anti-correlation coefficients(CCs)of-0.47 and-0.45 at the seasonal scale,*** the individual GNSS site,the number of the sites with CC<-0.4O between HYDL and GRACE/GLDASderived TWS changes accounts for 55.1%and 55.1%(SMC),13.0%and 7.4%(temperate monsoon climate,TMC),6.7%and 13.3%(temperate continental climate,TCC),32.3%and 38.7%(plateau climate,PC),*** the non-seasonal term,although the proportion with CC<-0.40 in each climate type decreases mainly due to the influence of local geodynamic and human activities,especially in the SMC and PC regions,GNSS site vertical deformations still show good capability in monitoring hydrological *** results provide valuable information for better application of GNSS to hydrology.

关键词： GNSS vertical displacement Hydrological loading GRACE GLDAS Climate setting

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Fault Diagnosis Model for UAV with Small Sample Size and Imbalanced Data 15

Fault Diagnosis Model for UAV with Small Sample Size and Imb...

引用

15th IEEE Global reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Song, Guoqing Ma, Ke Yang, Yang Dong, Yanchen Han, Danyang Suo, Mingliang School of Reliability and Systems Engineering Beihang University Beijing100191 China No.31850 People's Liberation Army of China Beijing102200 China Institute of Reliability Engineering National Key Laboratory of Science and Technology on Reliability and Environmental Engineering School of Reliability and Systems Engineering Beihang University Beijing100191 China

ISBN: (纸本)9798350354010

With the development of Unmanned Aerial Vehicles (UAV), their application scenarios and task requirements have become more complex, demanding higher standards for subsequent fault diagnosis and equipment maintenance. The actual flight data of UAV usually exhibits small sample sizes and imbalanced characteristics. To achieve more efficient fault prediction for UAV, this paper establishes a SMOTE-IWOA-RF fault diagnosis model. This model optimizes the Whale Optimization Algorithm (WOA) using chaotic initialization, nonlinear convergence factors, and Lévy flight strategies, resulting in better convergence accuracy and global search capability, as well as faster convergence speed. The model is compared with other classification models on data with different imbalance ratios, demonstrating that it is more efficient and accurate in UAV fault diagnosis, with the F1 score improving by about 10% compared to the pre-optimization state. Furthermore, the IWOA-RF model is combined with other data preprocessing methods, showing that SMOTE-IWOA-RF performs better on UAV operational data, indicating its practical value. © 2024 IEEE.

关键词： Fault detection

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Submarine Trenches and Wave-Wave Interactions Enhance the Sediment Resuspension Induced by Internal Solitary Waves

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Journal of Ocean University of China 2023年第4期22卷 983-992页

作者： TIAN Zhuangcai LIU Chao JIA Yonggang SONG Lei ZHANG Mingwei State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Key Laboratory of Coastal Science and Integrated Management Ministry of Natural ResourcesQingdao266061China

Internal solitary waves(ISWs)are nonlinear fluctuations in nature that could cause significant interactions between seawater and the *** have been proven to be an adequate cause of sediment resuspension in shallow and deep-sea *** the South China Sea,ISWs have the largest amplitude globally and directly interact with the seabed near the Dongsha slope in the northern South China *** analyzed the water profile and high-resolution multibeam bathymetric data near the Dongsha slope and revealed that submarine trenches have a significant impact on the sediment resuspension by ***,ISWs in the zone of the wave-wave interaction enhanced sediment mixing and *** concentration of the suspended particulate matter inside submarine trenches was significantly higher than that outside *** concentration of the suspended particulate matter near the bottoms of trenches could be double that outside them and formed a vast bottom nepheloid *** could increase the concentration of the suspended particulate matter in the entire water column,and a water column with a high concentration of the suspended particulate matter was formed above the *** in the wave-wave interaction zone near Dongsha could induce twice the concentration of the bottom nepheloid layer than those in other *** sediment resuspension caused by ISWs is a widespread occurrence all around the *** findings of this study can offer new insights into the influence of submarine trench and wave-wave interaction on sediment resuspension and help in geohazard assessment.

关键词： sediment resuspension internal solitary waves trench wave-wave interaction

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SAD-YOLO: A Small Object Detector for Airport Optical Sensors based on Improved YOLOv8

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IEEE Sensors Journal 2025年第11期25卷 20513-20522页

作者： Zhou, Wentao Cai, Chengtao Srigrarom, Sutthiphong Xu, Hao Liu, Ronglei Li, Chenming Harbin Engineering University College of Intelligent Systems Science and Engineering Harbin150001 China National University of Singapore Department of Mechanical Engineering Singapore119260 Singapore Harbin Engineering University College of Intelligent Systems Science and Engineering Heilongjiang Provincial Key Laboratory of Environment Intelligent Perception The Key Laboratory of Intelligent Technology and Application of Marine Equipment Ministry of Education Harbin150001 China National University of Singapore Department of Mechanical Engineering Singapore119260 Singapore

As a crucial technology for enhancing the autonomous perception capability of airport optical sensors, object detection has become a research focus. This article proposes a small object detector for airport optical sensors named SAD-YOLO to improve airport safety and assist airport traffic management. Firstly, our experiment finds that the YOLOv8x with the anchor box performs better in small object detection. Secondly, the ELAN-A module is designed based on YOLOv8x, which utilizes position, channel, and spatial attention methods to improve the neck and effectively enhance the feature fusion ability. Then, we introduce the Swin Transformer in the backbone and a SODL in the head to improve the small object feature extraction capability. Finally, we introduce the SIoU loss function to find the optimal model parameters for the proposed method. The airport traffic management system is equipped with high-performance computers. Therefore, this article focuses more on the accuracy and generalization of the proposed method. The comparison experiments show that the SAD-YOLO improves by 7.4% mAP on the ASS1 dataset compared to the official YOLOv8x. Compared to classical detectors, the proposed method obtains the optimal mAP on the generalizability experiments of MASD and ASS2 datasets, demonstrating that SAD-YOLO has excellent robustness and generalization. © 2001-2012 IEEE.

关键词： Information management

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