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Introducing Spin Polarization into Mixed-Dimensional Van der Waals Heterostructures for High-Efficiency Visible-Light Photocatalysis

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Energy & Environmental Materials 2023年第5期6卷 192-200页

作者： Yong Wang Wei Xu Yu Zhang Chengxin Zeng Weining Zhang Lin Fu Mei Sun Yizhang Wu Jian Hao Wei Zhong Youwei Du Rusen Yang Academy of Advanced Interdisciplinary Research School of Advanced Materials and NanotechnologyXidian UniversityXi'an 710126China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and Jiangsu Provincial Key Laboratory for NanotechnologyNanjing UniversityNanjing 210093China Department of Physics Shaanxi University of Science and TechnologyXi'an 710021China Department of Physics State Key Laboratory of Surface PhysicsFudan UniversityShanghai 200433China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

The low separation efficiency of the photogenerated carrier and the poor activity of the surface redox reaction are the main barrier to further improvement of photocatalytic *** address these issues,introducing spin-polarized electrons in single-component photocatalytic materials emerged as a promising ***,the decreased redox ability of photocarriers in these materials becomes a new ***,we mitigate this challenge with a carbon nitride sheet(CNs)/graphene nanoribbon(GNR)composite material that has a van der Waals heterostructures(vdWHs)and spin-polarized electron *** results and theoretical calculations show that the heterostructure has a strong redox ability,high carrier-separation efficiency,and enhanced surface catalytic ***,the mixed-dimensional CNs/GNR vdWHs exhibit remarkable performance for H_(2)and O_(2)generation as well as CO_(2)production under visible-light irradiation without any *** spin-polarized vdWHs discovered in this study revealed a new type of photocatalytic materials and advanced the development of spintronics and photocatalysis.

关键词： DFT calculations spin polarization Van der Waals heterostructures visible-light photocatalysis

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Improved the lightweight part identification method of YOLOv5 4

Improved the lightweight part identification method of YOLOv...

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4th International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2023

作者： Qin, Qi Zhao, Li-Gang Yuan, Jun-Tao School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang212100 China Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Jiangsu University of Science and Technology Zhenjiang212100 China

ISBN: (纸本)9781510666412

Aiming at the defects of the existing part recognition methods in the industrial production process when identifying small and dense parts, and the problem that the number of model parameters and large volume are difficult to deploy on the mobile platform, an improved YOLOv5 lightweight part target recognition model is proposed. On the basis of the YOLOv5 model, the Ghost module is first used to replace the backbone network to reduce the number of parameters of the model. Secondly, a SPP_F feature pyramid structure is constructed to speed up the training speed of the model and strengthen the ability of the model to extract information. Remove the detection layer for large target scales, thereby speeding up model training and detection;Finally, the GIOU function in the YOLOv5 model is replaced with the Alpha-SIOU function to improve the positioning accuracy of the bounding box. Experimental results show that the average accuracy (mAP) of the improved model reaches 99.5%, and the volume only accounts for 3.2MB, which is 35% faster than the original YOLOv5 model, reducing hardware costs and meeting the needs of deployment in low-computing equipment. © 2023 SPIE.

关键词： Detection and tracking algorithms Convolution Data modeling Feature extraction Performance modeling Object detection Target detection Target recognition Education and training Image processing

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Efficient electrooxidation of biomass-derived aldehydes over ultrathin Ni V-layered double hydroxides films

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Journal of Energy Chemistry 2023年第3期78卷 412-421,I0012页

作者： Biying Liu Zhikeng Zheng Yaoyu Liu Man Zhang Yuchen Wang Yangyang Wan Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural UniversityGuangzhou 510642GuangdongChina Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina

Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass *** we declared the efficient electrooxidation of biomass-derived aldehydes family over NiV-layered double hydroxides(LDHs) thin *** studies confirmed the hydroxyl active intermediate(-OH*) generated on the surface of NiV-LDHs films by employing electrochemical impedance spectroscopy and the electron paramagnetic resonance *** using advanced techniques,e.g.,extended X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy,NiV-LDHs films with 2.6 nm could expose larger specific surface *** benzaldehyde as a model,high current density of 200 mA cm^(-2)at 1.8 V ***,81.1% conversion,77.6% yield of benzoic acid and 90.8% Faradaic efficiency were reached,which was superior to most of previous *** DFT analysis was well matched with experimental findings and documented that NiV-LDHs had high adsorption capacity for the aldehydes to suppress the side reaction,and the aldehydes were oxidized by the electrophilic hydroxyl radicals formed on *** findings offer a universal strategy for the robust upgrading of diverse biomass-derived platform chemicals.

关键词： NiV-LDHs Films Hydroxyl radicals Electrocatalytic oxidation Biomass-derived aldehydes

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Analysis of bolt springback error based on ABAQUS 3

Analysis of bolt springback error based on ABAQUS

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3rd International Conference on Mechanical Design and Simulation, MDS 2023

作者： Yang, Jin Zhao, LiGang Kong, XiangGuo College of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang212003 China Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Zhenjiang212003 China

ISBN: (纸本)9781510664890

Aiming at the problem that the pre-tightening force of the bolt is not equal to the set tension value due to the rebound error of the fastening bolt of the hydraulic tensioner, take the M20 bolt of a certain type of press as an example. Firstly, the three-dimensional models of bolts and hydraulic tensioners were established, and a new thread hexahedron mesh drawing method was adopted. Then, the mathematical model of bolt rebound and preload is constructed. Then, the finite element software ABAQUS was used to conduct static analysis of the process of tightening bolts by the tensioner, simulating the residual preload of bolts under 12 groups of different working conditions. Finally, the hydraulic tension experiment was designed for verification. The results show that when the same tension is applied, the residual preload of the bolt is about 65% of the set tension value, that is, the rebound error of the bolt is about 35%, and the error is reduced by 5% compared with the theoretical calculation value, The reliability of fastening bolts of hydraulic tensioner is improved. © 2023 SPIE.

关键词： Errors

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Monitoring black tea fermentation quality by intelligent sensors: Comparison of image, e-nose and data fusion

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Food Bioscience 2023年第2期52卷 947-958页

作者： Qiaoyi Zhou Zhenhua Dai Feihu Song Zhenfeng Li Chunfang Song Caijin Ling Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization Tea Research InstituteGuangdong Academy of Agricultural SciencesGuangzhou 510640China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology School of Mechanical EngineeringJiangnan UniversityWuxi214122China

To scientifically and objectively monitor the fermentation quality of black tea,a computer vision system(CVS)and electronic nose(e-nose)were employed to analyze the black tea image and odor eigenvalues of Yinghong No.9 black ***,the variation trends of tea polyphenols,volatile substances,image eigenvalues and odor eigenvalues with the extension of fermentation time were analyzed,and the fermentation process was categorized into three stages for ***,principal component analysis(PCA)was employed on the image and odor eigenvalues obtained by CVS and *** least squares discriminant analysis(PLS-DA)was performed on 117 volatile components,and 51 differential volatiles were screened out based on variable importance in projection(VIP≥1)and one-way analysis of variance(P<0.05),including geraniol,linalool,nerolidol,and α-***,image features and odor features are fused by using a data fusion ***,the image,smell and fusion information were combined with random forest(RF),K-nearest neighbor(KNN)and support vector machine(SVM)to establish the classification models of different fermentation stages and to compare *** results show that the feature-level fusion strategy integrating the SVM was the most efficient approach,with classification accuracy rates of 100%for the training sets and 95.6%for the testing *** performance of Support Vector Regression(SVR)prediction models for tea polyphenol content based on feature-level fusion data outperformed data-level models(Rc,RMSEC,Rp and RMSEP of 0.96,0.48 mg/g,0.94,0.6 mg/g).

关键词： Computer vision Electronic nose(e-nose) Data fusion strategy Black tea fermentation

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Fabrication of wear-resistant PA6 composites with superior thermal conductivity and mechanical properties via constructing highly oriented hybrid network of SiC-packed BN platelets

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Journal of Materials Science & technology 2023年第15期146卷 200-210页

作者： Jing Chen Jiaming Zhu Yang Pan Hong Wu Shaoyun Guo Jianhui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of PlasticRubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065China Jiangsu Industrial Technology Research Institute of Advanced Polymer Materials Nanjing 211899China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 *** show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,*** is attributed to the highly oriented hybrid network that facilitates the formation of efficient thermal conductivity *** monitoring results during friction confirm that high TC favors the friction heat dissipation ***,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。

关键词： Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties

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Mechanism Design and Walking Stability Study of (2UPS-U) +R Series-Parallel Hybrid Bionic Wheel-Legged Quadruped robot

Mechanism Design and Walking Stability Study of (2UPS-U) +R ...

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Li, Shanshan Wang, Hongbo Li, Dong Li, Minghao Li, Lianqing Tian, Yu Niu, Jianye Yanshan University Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Qinhuangdao066004 China Fudan University Academy for Engineering & Technology Shanghai200433 China Yanshan University Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Key Lab. of Advanced Forging Stamping Technology and Science of Ministry of Education of China Qinhuangdao066004 China

ISBN: (纸本)9798350325706

In this paper, a bionic-based design of a series-parallel hybrid wheel-legged quadruped robot that can realize wheel-foot transformations is presented to achieve footed stable walking, and a method of measuring the static stability of the robot by the evaluation of the torque of the supporting leg rotor axis is proposed with the consideration of the robot's leg mass. Firstly, the whole robot position is solved;Secondly, the force on the robot during static walking is analyzed, and the stability of its static walking is also analyzed from the moment perspective;Finally, the stabilizing support region for static walking is solved, and the stabilizing support region for the robot in such a motion state is calculated. This paper provides high reference significance and value for the mechanism design and walking stability research of series-parallel hybrid wheel-legged quadruped robots. © 2023 IEEE.

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Epitaxially Growing 2D RGB Trichromatic Cocrystal Nanomeshes to Trigger Cross-Modulation White Light Emission

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Chinese Journal of Chemistry 2024年第24期42卷 3379-3386页

作者： Wenyubin Luo Cheng Zhang Shan Yang Lei Ding Yang Li Yanqiu Sun Qichun Zhang School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhouJiangsu 215009China Key Laboratory of Efficient Low-carbon Energy Conversion and Utilization of Jiangsu Provincial Higher Education Institutions School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhouJiangsu 215009China Department of Materials Science and Engineering Department of ChemistryCenter of Super-Diamond and Advanced Films(COSDAF)&Hong Kong Institute of Clean EnergyCity University of Hong KongHong Kong 999077China

Considering their oriented crystalline structure and high luminescent efficiency,the exploration of multi-component organic cocrystal systems with tunable supramolecular nanostructures and potential RGB light emission has emerged as a captivating but challenging ***,we propose a straightforward synthetic strategy to precisely govern the assembly,structure and structure-property relationship of organic *** employing the single-crystalline template-assisted epitaxial growth(SCT-EG)method,the two-dimensional(2D)highly-aligned cocrystal nanomeshes are firstly developed to afford an exceptional RGB trichromatic system,triggering cross-modulation white light emission(WLE)with remarkable stability and regeneration capacity over six *** transformation from random 1D microstructures to uniformly-oriented 2D nanomeshes can be attributed to the regulatory competitive intermolecularπ-π,CT interactions,and partial H bond interactions among ***,the successful construction of 2D RGB trichromatic cocrystal nanomeshes system holds promise to generate full-color display,which can function as multicolor inks for photonic dynamic recognition,information encryption,and decryption.

关键词： Organic cocrystal Nanomesh RGB trichromatic system Cross-modulation white light emission Competitive intermolecular interactions Organic optoelectronics Photoelectric performances 2D materials

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Shape-influenced non-reciprocal transport of magnetic skyrmions in nanoscale channel

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Chinese Physics B 2024年第7期33卷 605-611页

作者：陈杰尧罗佳胡更新王君林李冠祺陈振东陆显扬赵国平刘远吴竞徐永兵 School of Integrated Circuits Guangdong University of TechnologyGuangzhou 510006China School of Physics Engineering and TechnologyUniversity of YorkYork YO105DDUnited Kingdom College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.

关键词： skyrmion micromagnetic simulation racetrack memory

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Influence of Texture on Hall-Petch Slope in Hot-extruded AZ31 Magnesium Alloys

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Journal of Wuhan University of technology(Materials Science) 2023年第4期38卷 917-923页

作者：王岭 ZHAO Yiquan WANG Yanmeng SUN Chao CHEN Hongmei ZHANG Jing ZHAO Mei LIU Ying WANG Yinong Liaoning Key Laboratory of Chemical Additive Synthesis and Separation Yingkou Institute of TechnologyYingkou115014China CATARC Automotive Test Center(Tianjin)Co. LtdTianjin300399China School of Electrical Engineering Dalian University of TechnologyDalian116024China Provincial Key Lab of Advanced Welding Technology Jiangsu University of Science and TechnologyZhenjiang212003China School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang215600China School of Materials Science and Engineering Dalian University of TechnologyDalian116024China

To study the influence of texture on Hall-Petch slope,the Hall-Petch relationships of two hot-extruded AZ31 alloys(A117 and A189)were determined by the measurement of yield strength at room *** determine the real texture difference,the texture changes were facilitated by the variation of extrusion ratio and demonstrated by the actual grain orientation *** A117 alloys exhibited higher Hall-Petch slope in comparison of A187 in the condition of tension and compression,because A117 alloys had lower volume fraction of grains in the range of basal pole 75°-90°.The Hall-Petch slope differences for both alloys were analyzed and discussed by boundary obstacle against deformation propagation in grains with various *** to the higher volume fraction of grains in the range of basal pole 75°-90°in A189,the effect of hindering dislocation slip or twinning propagation by grains boundary was weaker than of A117.

关键词： Hall-Petch relationship AZ31 texture

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