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Eco-friendly polysaccharide coatings for antifouling and dragreduction and potential application for marine devices

Friction 2024年第4期12卷 726-744页

作者： Hao YANG Liguo QIN Wenhui ZHAO Fagla Jules MAWIGNON Hui GUO Yongkang WU Yali ZHANG Guangneng DONG Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Institute of Design Science and Basic ComponentsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Biomedical Information of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Department of Endocrinology First Affiliated Hospital of Medical CollegeXi'an Jiaotong UniversityXi’an 710061China

Traditional antifouling agents usually have a certain toxic effect on marine environments and non-target *** this study,Dictyophora indusiata polysaccharide(DIP)was applied as a natural antifouling surface modifier to prepare the surface coating for marine *** DIP coatings were prepared:*** spore polysaccharide(DISP),*** volva polysaccharide(DIVP),and *** embryonic body polysaccharide(DIEP).The antifouling,tribological,and anticorrosion behavior of the coatings were *** revealed that the three kinds of DIP coatings had excellent antifouling properties,which could effectively prevent the adhesion of Chlorella and the attachment of water-based and oily stains on the ***,the coatings showed great mechanical stability and could maintain an extremely low coefficient of friction(COF<0.05)after continuous *** drag reduction rate of the coated surfaces reached 5%,showing a powerful lubrication ***,the DIP coatings presented an outstanding corrosion resistance,where the equivalent circuit impedances were 4-9 orders of magnitude higher than the control *** research showed a promising prospect of surface coating fabrication with DIP for marine devices to achieve the purpose of antifouling and drag reduction.

关键词： Dictyophora indusiata polysaccharide(DIP)coating antifouling anticorrosion lubrication and drag reduction

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A Data-Driven Closed-Loop System Identification Approach Using Canonical Correlation Analysis 25

A Data-Driven Closed-Loop System Identification Approach Usi...

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25th IEEE International Conference on Industrial technology, ICIT 2024

作者： Qiao, Xinyu Li, Xianling Zheng, Wei Huo, Mingyi Jiang, Yuchen Luo, Hao Harbin Institute Of Technology Department Of Control Science And Engineering Harbin China Wuhan 2ndShip Design And Research Institute Science And Technology On Thermal Energy And Power Laboratory Wuhan China

ISBN: (纸本)9798350340266

In this paper, a data-driven closed-loop system identification approach using canonical correlation analysis (CCA) is proposed. Based on the subspace identification methods (SIM), an auxiliary matrix is constructed by utilizing known controller information in the structure of the closed-loop system. With the help of the projection, the equivalent relationship between past input and future output is found, and the optimal identification of system parameters is implemented by using the CCA method. The proposed method solves the biased identification problem caused by the correlation between closed-loop input and noise. The main results are tested and verified via the numerical example, and the superiority of the identification estimation results of the proposed method is compared through different methods. © 2024 IEEE.

关键词： Closed loop systems

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Flexible Inverse design of Microwave Filter Customized on Demand With Wavelet Transform Deep Learning

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IEEE Transactions on Computer-Aided design of Integrated Circuits and Systems 2025年第3期44卷 806-817页

作者： Xu, Kuiwen Wang, Jianguo Cai, Jialin Ma, Xuetiao Lv, Qinyi Chen, Shichang Liu, Jie Liu, Jun Hangzhou Dianzi University Innovation Center for Electronic Design Automation Technology The Key Laboratory of RF Circuits and Systems Ministry of Education Hangzhou310018 China Chang'an Campus Northwestern Polytechnical University School of Electronic Information Xi'an710060 China University of Electronic Science and Technology of China School of Electronic Science and Engineering Chengdu610054 China Information Science Academy China Electronics Technology Group Corporation Beijing100846 China

Artificial intelligence (AI) techniques are increasingly being used for the inverse design of microwave devices. However, several challenges, including intensive computation costs for training samples, high-dimensional data, nonuniformity, and low-quality samples in the design space, can negatively impact the final modeling performance. To alleviate these issues, a high-quality sampling inverse design scheme incorporating wavelet transform deep learning (HQS-WTDL) is proposed to achieve customized, automated microwave filter design. In the forward simulation-based sampling, particle swarm optimization (PSO) is used to tentatively select rule-defined samples. Multilabel synthetic minority over-sampling technique (MLSMOTE) is then applied to enlarge the training samples and improve their uniformity in the design space. An inverse modeling approach using neural networks to map the nonlinear relationship between a given set of S-parameters and required filter structural parameters is presented. Given that the dimension of the S-parameters is much higher than that of the structure parameters, the corresponding neural network used in this approach is deep and complex, with multiple layers and neurons. To reduce the number of input variables, the S-parameters are subjected to wavelet transformation, allowing for more efficient representation by the neural network. The proposed method is validated using a band-pass microstrip hairpin filter as an example. Results demonstrate that the proposed approach achieves better modeling effectiveness and inverse design efficiency than conventional methods. In addition, the proposed method allows for fast customization of device parameters, such as center frequencies and bandwidths with good prediction accuracy. © 1982-2012 IEEE.

关键词： Inverse problems

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EXPERIMENTAL STUDY ON HEAT TRANSFER CHARACTERISTICS OF HIGH TEMPERATURE HEAT PIPE WITH CAPILLARY WICK DURING EVAPORATION 30

EXPERIMENTAL STUDY ON HEAT TRANSFER CHARACTERISTICS OF HIGH ...

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30th International Conference on Nuclear Engineering, ICONE 2023

作者： Zhou, Zheng Ma, Yugao Wu, Qi Ma, Zaiyong Sun, Wan Zhang, Luteng Zhu, Longxiang Pan, Liangming Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of Education Chongqing University Chongqing400044 China Department of Nuclear Engineering and Technology Chongqing University Chongqing400044 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9784888982566

Due to the surface covered by the capillary wick in the high temperature heat pipe, the classical evaporation and condensation model may be difficult to characterize the evaporation process well in the high temperature heat pipe under different working conditions. Therefore, this paper carried out an experimental study on the heat transfer characteristics of the evaporation process of high temperature heat pipe with capillary wick. By measuring the axial and radial temperature distribution in the high temperature heat pipe under different working conditions, the phase interface evaporation thermal resistance and evaporation coefficient (Hertz-Knudsen equation) at different temperatures in the high temperature heat pipe were calculated, and the variation law of evaporation coefficient under different working conditions was analyzed. The results show that the magnitude of the evaporation thermal resistance is between 0 and 10-3, which means the evaporation heat transfer coefficient is very high. In general, with the increase of temperature(pressure), the logarithm of evaporation coefficient has a good negative linear correlation with pressure. In addition, it is found that if the adiabatic section temperature commonly used in engineering calculation is taken as the saturation temperature, the value of evaporation coefficient obtained is relatively small, as well as the data dispersion, which is due to axial thermal resistance is introduced. Furthermore, by fitting the experimental data, a correlation for the evaporation of high temperature heat pipe with capillary wick is proposed. © 2023 by JSME.

关键词： Evaporation

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One-DOF Rigid and Flat-Foldable Origami Polyhedrons with Slits

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Acta Mechanica Solida Sinica 2023年第4期36卷 479-490页

作者： Yuehao Zhang Yuanqing Gu Yan Chen Ming Li Xiao Zhang School of Mechanical Engineering Tianjin UniversityTianjin 300350China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300350China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Aerospace System Engineering ShanghaiShanghai 201109China

Rigid origami has great potential in aerospace applications,especially deployable polyhedrons with one degree of freedom(DOF)and flat-foldability,whose types are few to *** this paper,we create a novel foldable cube and a rhombic dodecahedron by introducing slits and diagonal creases to the surfaces,whose one-DOF rigid and flat-foldable properties are verified by kinematic ***,based on the isohedral quadrilateral transform,we project the creases and slits of the rhombic dodecahedron onto a tetrahedron to obtain a novel foldable tetrahedron that has two flat-foldable motion paths due to the existence of collinear *** the second path,unnecessary creases are removed,and an origami tetrahedron with simplified creases is *** origami tetrahedrons possess a small folded *** analysis reveals that these newly discovered origami polyhedrons are flat-foldable with one DOF,demonstrating favorable application prospects for space architectures and extraterrestrial habitats.

关键词： Rigid origami Flat-foldability Cube Rhombic dodecahedron Tetrahedron

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Multi-agent mobile networking observation experiment at the air-sea interface of ocean eddy

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science China Earth sciences 2024年第10期67卷 3083-3097页

作者： Yi ZHANG Dongxiao WANG Li ZHOU Chunhua QIU Yunfei ZHANG Zhiliang DENG Biao ZHANG Yunping LIU Yeqiang SHU Fenghua ZHOU Danian LIU Zhengqiu ZHANG School of Marine Sciences Sun Yat-Sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Marine Technology and Geomatics Jiangsu Ocean UniversityLianyungang 222005China Zhuhai Yunzhou Intelligent Technology Co. Ltd.Research and Design CenterZhuhai 519000China School of Automation Nanjing University of Information Science&TechnologyNanjing 210044China School of Marine Sciences Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Current climate forecasting has advanced to the stage of investigating mesoscale air-sea interactions. Recent studies have identified significant structural differences between the cores and edges of mesoscale eddies;however, the effects of these structural variations on air-sea fluxes and the Marine Atmospheric Boundary Layer(MABL) remain underexplored. Traditional observations often fail to capture the detailed structures of eddies, necessitating enhanced observations at high spatiotemporal resolution for mesoscale eddies. To address this, efforts have been made to develop multi-agent platforms and expendable air-sea interface observation technologies. A task-oriented observation scheme was developed to monitor the spatial characteristics of mesoscale eddies. The South China Sea(SCS) is rich in mesoscale eddies with rapid motion changes, requiring enhanced observations of the air-sea interface using multi-agent mobile networking. An anticyclonic eddy was observed in the eastern region of the Xisha Islands in the SCS, and we examined variations in air-sea fluxes across different regions within the eddy.

关键词： Multi-agent Mobile networking Mesoscale eddy Air-sea interface Collaborative observation

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A Local Deep Learning Method for Solving High Order Partial Differential Equations

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Numerical Mathematics(Theory,Methods and Applications) 2022年第1期15卷 42-67页

作者： Jiang Yang Quanhui Zhu International Center of Mathematics Southern University of Science and TechnologyShenzhen 518055China Department of Mathematics Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen 518055China

At present, deep learning based methods are being employed to resolvethe computational challenges of high-dimensional partial differential equations(PDEs). But the computation of the high order derivatives of neural networks iscostly, and high order derivatives lack robustness for training purposes. We proposea novel approach to solving PDEs with high order derivatives by simultaneously approximating the function value and derivatives. We introduce intermediate variablesto rewrite the PDEs into a system of low order differential equations as what is donein the local discontinuous Galerkin method. The intermediate variables and the solutions to the PDEs are simultaneously approximated by a multi-output deep neuralnetwork. By taking the residual of the system as a loss function, we can optimizethe network parameters to approximate the solution. The whole process relies onlow order derivatives. Numerous numerical examples are carried out to demonstrate that our local deep learning is efficient, robust, flexible, and is particularlywell-suited for high-dimensional PDEs with high order derivatives.

关键词： Deep learning deep neural network high order PDEs reduction of order deep Galerkin method

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Simplified Time-Domain design Methodology for LLC Resonant Converter in EV Charging Station Application 3

Simplified Time-Domain Design Methodology for LLC Resonant C...

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3rd International Conference on Power Systems and Electrical technology, PSET 2024

作者： Yuan, Ye Xu, Lin Yao, Chuan Yuan, Jialing Wang, Xuehua Ruan, Xinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9798350353204

LLC resonant converter featuring excellent soft-switching characteristic has been widely used in electric vehicle (EV) charging stations and other applications requiring isolated voltage conversion. The Fundamental Harmonic Approximation (FHA) model has been widely used in the field of resonant converter due to its simple and intuitive characteristics. When the switching frequency deviates from the resonant frequency, the method no longer maintains high accuracy. In this paper, a more accurate parameter design method based on the simplified time-domain model is proposed, considering the load characteristic of the charging stations. Finally, the simulation model verifies that the simplified design method has higher accuracy in predicting voltage gain. Meanwhile, the resonant tank parameters designed based on this method make the converter more efficient in situations where voltage and frequency vary across a wide range. © 2024 IEEE.

关键词： Resonant converters

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BDGSE: A Symbolic Execution Technique for High MC/DC 23

BDGSE: A Symbolic Execution Technique for High MC/DC

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23rd IEEE International Conference on Software Quality, Reliability, and Security, QRS 2023

作者： Cai, Huangli Zhang, Zhiyi Jian, Yifan Li, Dan Huang, Zhiqiu Nanjing University of Aeronautics and Astronautics Collage of Computer Science and Technology Nanjing China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China Nanjing University of Aeronautics and Astronautics Ministry Key Laboratory for Safety-Critical Software Development and Verification Nanjing China

ISBN: (纸本)9798350319583

Modified Condition/Decision Coverage (MC/DC) is a test coverage standard with excellent fault detection capability, which is widely used in testing safety-critical software. Symbolic execution generates test cases automatically to achieve high code coverage. However, since symbolic execution uses short-circuit evaluation to evaluate decisions, it fails to guarantee the consistency of other conditions in a decision required by the MC/DC criterion. As a result, it is incapable of generating MC/DC test cases to test safety-critical systems adequately. To solve this problem, we propose Branch Dependence Guided Symbolic Execution (BDGSE), a symbolic execution technique for high MC/DC. The approach utilizes static analysis to compute the branch dependencies, then guides symbolic execution to selectively explore paths and simplify test cases, and finally generates a small number of test cases to achieve high MC/DC coverage. Our experimental results show that BDGSE can generate high-quality test cases. Although BDGSE generates fewer test cases, it can achieve higher MC/DC coverage than SPF and random methods, and the fault detection capability of test cases generated by BDGSE is comparable to that of test cases generated by SPF. © 2023 IEEE.

关键词： Software testing

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design Optimization of Flange Parts Based on 3D Printing Simulation 2nd

Design Optimization of Flange Parts Based on 3D Printing Sim...

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2nd World Conference on Intelligent and 3D Technologies, WCI3DT 2023

作者： Zhang, Dashun Miao, Liqin Wang, Jing Sun, Suhui Meng, Fanjun Xu, Xiaowen Li, Xueguang Department of Numerical Design and Manufacture Changchun University of Science and Technology Changchun130012 China College of Mechanical and Electrical Engineering Intelligent Manufacturing Technology Innovation Laboratory of Jilin Province Changchun University of Science and Technology Changchun130012 China

ISBN: (纸本)9789819721436

In this paper, we simulate the 3D printing process of flange parts based on Unigraphics software, through the setting of printing speed, nozzle temperature, printing layer thickness, printing material and other related parameters, we simulate the high temperature area and deformation area in the Fused Deposition Modeling printing process, and compensate and optimize the model to obtain a better new 3D printing model, and then compare the simulation results of two models and the actual printing results respectively. Finally, the simulation results of the two models and the actual printing results are compared and conclusions are drawn. The simulation results of the temperature field of the part show that the optimized model effectively reduces the area of the internal and external high-temperature region, in which the maximum temperature of the top surface of the hexagonal prism of the flange part is reduced by about 150 ℃ and the minimum temperature is reduced by about 300 ℃, the simulation results of the deformation of the part show that the maximum deformation of the printed part is reduced from 0.1179 to 0.0814 mm when the part is not cooled, and the deformation is reduced from 0.302 mm after the cooling support is removed. After the cooling support was removed, the deformation was reduced from 0.302 to 0.228 mm, and the temperature and deformation were obviously optimized. Finally, through the actual 3D printing of the two models, the results show that the unoptimized initial part has obvious paste and deformation at the top after printing, while the optimized part has no such situation. From the above analysis, it is concluded that the compensation optimization function of Unigraphics software has an important role in reducing the temperature and deformation during the 3D printing of the parts. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Fused Deposition Modeling

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