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Interfacial behavior of a thermoelectric film bonded to a graded substrate

Applied Mathematics and Mechanics(English Edition) 2023年第11期44卷 1853-1870页

作者： Juan PENG Dengke LI Zaixing HUANG Guangjian PENG Peijian CHEN Shaohua CHEN School of Materials Science and Physics State Key Laboratory for Geomechanics and Deep Underground EngineeringSchool of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116Jiangsu ProvinceChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Institute of TechnologyBeijing 100081China

To improve the thermoelectric converting performance in applications such as power generation,reutilization of heat energy,refrigeration,and ultrasensitive sensors in scramjet engines,a thermoelectric film/substrate system is widely designed and applied,whose interfacial behavior dominates the strength and service life of thermoelectric ***,a theoretical model of a thermoelectric film bonded to a graded substrate is *** interfacial shear stress,the normal stress in the thermoelectric film,and the stress intensity factors affected by various material and geometric parameters are comprehensively *** is found that adjusting the inhomogeneity parameter of the graded substrate,thermal conductivity,and current density of the thermoelectric film can reduce the risk of interfacial failure of the thermoelectric film/graded substrate *** a stiffer and thicker thermoelectric film is advantageous to the reliability of the thermoelectric film/graded substrate *** results should be of great guiding significance for the present and upcoming applications of thermoelectric materials in various fields.

关键词： thermoelectric film graded substrate interfacial behavior singular integral equation shear stress intensity factor

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Lawn Weed Recognition Based on Fused Feature Fuzzy C-Means Clustering Algorithm 42

Lawn Weed Recognition Based on Fused Feature Fuzzy C-Means C...

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42nd Chinese Control Conference, CCC 2023

作者： Yao, Yetao Hua, Chunjian Zhang, Airong School of Mechanical Engineering Jiangnan University Wuxi214122 China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology Wuxi214122 China

ISBN: (纸本)9789887581543

For lawn, weeds are one of the important factors that cause its degradation and endanger agricultural production. In order to achieve accurate application of herbicides for lawn weed management, aiming at the problem that weeds are difficult to be segmented due to the similar color between weeds and lawns in natural environment, this paper proposed an improved fuzzy C-means (FCM) clustering segmentation algorithm. Firstly, the region of interest was extracted by extra-green segmentation and converted to HSV space for multi-channel difference fusion for image preprocessing to expand the feature difference between weeds and lawns. Secondly, the median filtering was carried out under the constraint of area area to remove the lawn background noise in the preprocessed image while maintaining the details of weed leaves. Then, an anisotropic detection operator of difference of gray distribution(DGD) was proposed, which introduces the features of different directions of gray distribution around pixels in the clustering process to achieve lawn weed segmentation. Finally, one versus rest support vector machines(OVR SVMs) were constructed to solve the multi classification problem of lawn weeds. To solve the problem that weeds overlap and occlude each other, which leads to the reduction of local area identification, an optimization method of extracting feature information from image blocks is proposed. The experimental results show that, compared with the traditional FCM algorithm, the algorithm in this paper has a better suppression effect on most noise areas, can effectively segment and identify weeds in the natural environment, which has practical application value. © 2023 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Support vector machines

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Blockchain-Enabled Secure, Fair and Scalable Data Sharing in Zero-Trust Edge-End Environment

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IEEE Journal on Selected Areas in Communications 2025年第6期43卷 2056-2069页

作者： Xu, Xiaolong Meng, Ke Xiang, Haolong Cui, Guangming Xia, Xiaoyu Dou, Wanchun Nanjing210044 China Nanjing University of Information Science and Technology School of Software and the Jiangsu Province Engineering Research Center of Advanced Computing and Intelligent Services Nanjing210044 China RMIT University School of Computing Technologies MelbourneVIC3000 Australia Nanjing University State Key Laboratory for Novel Software Technology Nanjing210023 China

In edge computing, the Zero-Trust Security Model (ZTSM), as a key enabling technology for next-generation networks, plays a crucial role in providing authentication for addressing data sharing concerns, such as frequent data breaches, data misuse, and cyberattacks. However, due to the complexity and diversity of edge environments, ZTSM struggles to meet the security requirements of data sharing frameworks solely through enhanced authentication. Consequently, such frameworks with ZTSM still face challenges in ensuring data integrity, evaluating various node behaviors, and coping with the increasing complexity of node attributes. To address these issues, we propose a blockchain-enabled secure, fair and scalable data sharing framework in a zero-trust edge-end environment in this paper. Specifically, we first propose a Merkle forest-based data storage model for the classified storage of loosely coupled data, consequently enhancing the scalability of the model. Then, we design a node behavior-based reputation assessment mechanism to ensure fairness during data sharing. Moreover, a data sharing protocol supervised by smart contract is proposed, working with the aforementioned storage and assessment schemes, to ensure the security of data sharing. Finally, comprehensive security analysis validates the security, fairness and scalability of the proposed framework. Extensive experimental results show that, as transaction volume grows, the time cost of data traversal in the storage model becomes progressively more efficient. Additionally, when the size of the smart contract is increased tenfold, the maximum time cost of the data sharing protocol rises by only 4.98 times. © 1983-2012 IEEE.

关键词： Data integrity

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Two monofluoride-bridged Dy~Ⅲdimers with different magnetization dynamics

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Chinese Chemical Letters 2023年第6期34卷 454-458页

作者： Mengmeng Wang Xixi Meng Ning Liu Yi-Quan Zhang Na Xu Wei Shi Peng Cheng Department of Chemistry Key Laboratory of Advanced Energy Materials Chemistry(MOE)and Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China Jiangsu Key Lab for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjing 210023China

As a monoatomic bridge,fluoride ion can transmit efficient magnetic interaction between lanthanide ions but its effect on tuning the magnetization dynamics has not been well ***,two monofluoride-bridged dinuclear dysprosium complexes[Dy_(2)F(bbpen)_(2)(Et OH)_(2)]Br·Et OH(1)and[Dy_(2)F(bbppy)_(2)]Br·2Et OH(2)with Dy-F-Dy angles of~178°and their diamagnetic-ion diluted analogues 1'and 2'were *** studies reveal that 1 and 1'barely show any magnetization dynamics,but 2 and 2'exhibit strong magnetization *** experimental analysis combined with ab initio calculations reveals that the different magnetization dynamics between 1 and 2 mainly originate from the effect of magnetic anisotropy by terminal ligand and bridging group of the chelating ligand,and the fluoride bridge can effectively suppress the quantum tunneling of the magnetization and turn on Orbach process in 2.

关键词： Fluoride ion bridge Dinuclear Dy~Ⅲcomplexes Magnetization dynamics Single-molecule magnet Suppressing QTM

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Visual localization and map construction based on ground texture 19th

Visual localization and map construction based on ground tex...

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19th Chinese Intelligent Systems Conference, CISC 2023

作者： Chen, Xin Yu, Lei School of Mechanical and Electric Engineering Soochow University Suzhou China Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education Lanzhou Jiaotong University Lanzhou China Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of Technology Huai’an China

ISBN: (纸本)9789819968817

This paper describes a visual localization and map construction method based on ground texture. The ground texture is scanned twice in a zigzag pattern and divided into a grid to avoid distortion of the stitched image. A global optimization method is used to calculate the image pose by reprojection constraint and key frame selection to stitch the global map. For positioning, the global positioning is transformed into a local positioning process through global search and local optimization, which improves the speed and accuracy of positioning. For map updating, local optimization is performed by constructing loopbacks for possible stain occlusion or breakage problems to solve tracking loss and repositioning problems. Experimental results show that the ground texture stitching and localization results after global optimization match well with the true values, and the global maps constructed by stitching are aligned with the true physical locations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Textures

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Mixed‑Dimensional Assembly Strategy to Construct Reduced Graphene Oxide/Carbon Foams Heterostructures for Microwave Absorption,Anti‑Corrosion and Thermal Insulation

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Nano-Micro Letters 2024年第11期16卷 1-18页

作者： Beibei Zhan Yunpeng Qu Xiaosi Qi Junfei Ding Jiao‑jing Shao Xiu Gong Jing‑Liang Yang Yanli Chen Qiong Peng Wei Zhong Hualiang Lv College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang City 550025People’s Republic of China College of Materials and Metallurgy Guizhou UniversityGuiyang City 550025People’s Republic of China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093People’s Republic of China Department of Materials Science and Laboratory of Advanced Materials Fudan UniversityShanghai 200433People’s Republic of China

Considering the serious electromagnetic wave(EMW)pollution problems and complex application condition,there is a pressing need to amalgamate multiple functionalities within a single ***,the effective integration of diverse functions into designed EMW absorption materials still faces the huge ***,reduced graphene oxide/carbon foams(RGO/CFs)with two-dimensional/three-dimensional(2D/3D)van der Waals(vdWs)heterostructures were meticulously engineered and synthesized utilizing an efficient methodology involving freeze-drying,immersing absorption,secondary freeze-drying,followed by carbonization *** to their excellent linkage effect of amplified dielectric loss and optimized impedance matching,the designed 2D/3D RGO/CFs vdWs heterostructures demonstrated commendable EMW absorption performances,achieving a broad absorption bandwidth of 6.2 GHz and a reflection loss of-50.58 dB with the low matching ***,the obtained 2D/3D RGO/CFs vdWs heterostructures also displayed the significant radar stealth properties,good corrosion resistance performances as well as outstanding thermal insulation capabilities,displaying the great potential in complex and variable ***,this work not only demonstrated a straightforward method for fabricating 2D/3D vdWs heterostructures,but also outlined a powerful mixeddimensional assembly strategy for engineering multifunctional foams for electromagnetic protection,aerospace and other complex conditions.

关键词： Multifunctionality Reduced graphene oxide/carbon foams 2D/3D van der Waals heterostructures Electromagnetic wave absorption Thermal insulation

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Boosting the cycling stability of rechargeable magnesium batteries by regulating the compatibility between nanostructural metal sulfide cathodes and non-nucleophilic electrolytes

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Nano Research 2023年第2期16卷 2399-2408页

作者： Xiaolan Xue Xinmei Song Anyang Tao Wen Yan Xiao Li Zhang Zuoxiu Tie Zhong Jin Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Suzhou Tierui New Energy Technology Co.Ltd. Suzhou 215228China Nanjing Tieming Energy Technology Co.Ltd. Nanjing 210093China

Rechargeable magnesium batteries are attractive candidates for energy storage due to their high theoretical specific capacities,free of dendrite formation and natural abundance of ***,the development of magnesium secondary batteries is severely limited by the lack of high-performance cathode materials and the incompatibility of electrode materials with ***,we report the application of CuS nanoflower cathode material based on the conversion reaction mechanism for highly reversible magnesium batteries with boosted electrochemical performances by adjusting the compatibility between the cathode and *** applying non-nucleophilic electrolytes based on magnesium bis(hexamethyldisilazide)and magnesium chloride dissolved in the mixed solvent of tetrahydrofuran and N-butyl-N-methyl-piperidinium bis((trifluoromethyl)sulfonyl)imide(Mg(HMDS)_(2)-MgCl_(2)/THF-PP14TFSI)or magnesium bis(trifluoromethanesulfonyl)imide,magnesium chloride and aluminium chloride dissolved in dimethoxyethane(Mg(TFSI)2-MgCl_(2)-AlCl_(3)/DME),the magnesium batteries with CuS nanoflower cathode exhibit a high discharge capacity of~207 mAh·g^(–1)at 100 mA·g^(–1)and a long life span of 1,000 cycles at 500 mA·g^(–1).This work suggests that the rational regulation of compatibility between electrode and electrolyte plays a very important role in improving the performance of multi-valent ion secondary batteries.

关键词： rechargeable magnesium batteries conversion reaction mechanism CuS nanoflower cathode non-nucleophilic electrolyte cycling lifespan

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Strain Engineering and Halogen Compensation of Buried Interface in Polycrystalline Halide Perovskites

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Research 2024年第4期2024卷 332-342页

作者： Bin Zhou Chuanzhen Shang Chenyun Wang Duo Qu Jingyuan Qiao Xinyue Zhang Wenying Zhao Ruilin Han Shuxin Dong Yuhe Xue You Ke Fengjun Ye Xiaoyu Yang Yongguang Tu Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) Xi’an Institute of Flexible Electronics(IFE)&Xi’an Institute of Biomedical Materials and Engineering(IBME)Northwestern Polytechnical UniversityXi’anShaanxi 710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical University218 Qingyi RoadNingbo 315103China Honors College Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’anShaanxi 710072China Key Laboratory of Flexible Electronics(KLoFE)and Institution of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)NanjingTech UniversityNanjingJiangsu 211816China Key Laboratory for Organic Electronics and Information Displays(KLOEID)and Institute of Advanced Materials(IAM) Nanjing University of Posts and TelecommunicationsNanjingJiangsu 210023China Beijing Solarverse Optoelectronic Technology Co.Ltd Beijing 100176China Intelligent Display Research Institute Leyard Optoelectronic Co.LtdBeijing 100091China

Inverted perovskite solar cells based on weakly polarized hole-transporting layers suffer from the problem of polarity mismatch with the perovskite precursor solution,resulting in a nonideal wetting *** addition to the bottom-up growth of the polycrystalline halide perovskite,this will inevitably worse the effects of residual strain and heterogeneity at the buried interface on the interfacial carrier transport and localized compositional ***,we propose a multifunctional hybrid pre-embedding strategy to improve substrate wettability and address unfavorable strain and *** exposing the buried interface,it was found that the residual strain of the perovskite films was markedly reduced because of the presence of organic polyelectrolyte and imidazolium salt,which not only realized the halogen compensation and the coordination of Pb2+but also the buried interface morphology and defect recombination that were well *** from the above advantages,the power conversion efficiency of the targeted inverted devices with a bandgap of 1.62 eV was 21.93%and outstanding intrinsic *** addition,this coembedding strategy can be extended to devices with a bandgap of 1.55 eV,and the champion device achieved a power conversion efficiency of 23.74%.In addition,the optimized perovskite solar cells retained 91%of their initial efficiency(960 h)when exposed to an ambient relative humidity of 20%,with a T80 of 680 h under heating aging at 65℃,exhibiting elevated durability.

关键词： stability. perovskite embedding

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Lotus and Poikilotherm Inspired PPy/PDMS@Nonwoven Fabric Sorbent with Superior Photothermal Effects for the Cleanup of High-viscous Crude Oil

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Chinese Journal of Chemistry 2025年第7期43卷 759-768页

作者： Hiroshi Fu Yang Chen Tong Zhang Xi Wang Songnan Zhang Jianying Huang Di Zhang Xiaoming Qian Yuekun Lai State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes/Key Laboratory of Advanced Textile Composites of Ministry of Education School of Textile Science and EngineeringTiangong UniversityTianjin 300387China Huafon Microfibre(Jiangsu)Co. Ltd.Nantongjiangsu 226000China Jiangxi Center for Modern Apparel Engineering and Technology Jiangxi Institute of Fashion TechnologyNanchangJiangxi 330201China National Engineering Research Center of Chemical Fertilizer Catalyst(NERC-CFC) College of Chemical EngineeringFuzhou UniversityFuzhouFujian350116China School of Chemical Engineering and Technology Tiangong UniversityTianjin 300387China

The frequent occurrence of oil spills not only results in the waste of petroleum resources,but also poses a serious threat to the marine ecological *** the large amount of crude oils with high viscosity,it is urgent to develop a sorbent capable of efficiently reducing the viscosity for the cleanup of oil *** by the“lotus effect”and“poikilotherm which utilize the solar energy for thermoregulation”,the low surface energy material polydimethylsiloxane(PDMS)and polypyrrole(PPy)were loaded over the island nonwoven fabric to fabricate a novel crude oil sorbent *** nonwoven fabric achieved an efficient photothermal ***,the fluorine-free PDMS was used to hydrophobically modify the nonwoven fabric,endowing it with excellent oil-water separation performance,with a separation efficiency of up to 95%.After 10 cycles,the separation efficiency of PPy/PDMS modified nonwoven fabric(PPy/PDMS@NF)was still above 90%,demonstrating superior *** addition,the PPy/PDMS@NF possessed the self-cleaning *** light conditions,the PPy/PDMS@NF was rapidly heated up,reducing the viscosity of crude oil and enabling the effective recovery of oil *** one sun illumination(1.0 kW·m^(-2)),the surface temperature of the PPy/PDMS@NF reached 60.7℃,and its sorption capacity for high-viscosity crude oil reached 7 gcrude oil·gsorbent^(-1).Thanks to its environmental friendliness and excellent sorption capacity,this work provides a new option for dealing with the high-viscosity marine oil spills.

关键词： Nonwoven fabric Crude oil sorption Photothermal conversion Oil-water separation Multifunctional Hydrophobic effect Bionics Self-cleaning

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High-efficiency tandem Ho:YAG single-crystal fiber laser delivering more than 100 W output power

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High Power Laser Science and Engineering 2024年第4期12卷 36-40页

作者： Jianlei Wang Zihao Tong Changsheng Zheng Tianyi Du Yongguang Zhao Chun Wang Key Laboratory of Laser&Infrared System Ministry of EducationShandong UniversityQingdaoChina Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry Jiangsu Normal UniversityXuzhouChina

We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 *** addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling *** than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.

关键词： high efficiency Ho:YAG power handling capability single-crystal fiber

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