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Underwater Image Classification Based on EfficientnetB0 and Two-Hidden-Layer Random Vector Functional Link

Journal of Ocean University of China 2024年第2期23卷 392-404页

作者： ZHOU Zhiyu LIU Mingxuan JI Haodong WANG Yaming zhu zefei School of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Key Laboratory of DDIMCCP Lishui UniversityLishui 323000China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

The ocean plays an important role in maintaining the equilibrium of Earth’s ecology and providing humans access to a wealth of *** obtain a high-precision underwater image classification model,we propose a classification model that combines an EfficientnetB0 neural network and a two-hidden-layer random vector functional link network(EfficientnetB0-TRVFL).The features of underwater images were extracted using the EfficientnetB0 neural network pretrained via ImageNet,and a new fully connected layer was trained on the underwater image dataset using the transfer learning *** learning ensures the initial performance of the network and helps in the development of a high-precision classification ***,a TRVFL was proposed to improve the classification property of the *** construction of the two hidden layers exhibited a high accuracy when the same hidden layer nodes were *** parameters of the second hidden layer were obtained using a novel calculation method,which reduced the outcome error to improve the performance instability caused by the random generation of parameters of ***,the TRVFL classifier was used to classify features and obtain classification *** proposed EfficientnetB0-TRVFL classification model achieved 87.28%,74.06%,and 99.59%accuracy on the MLC2008,MLC2009,and Fish-gres datasets,*** best convolutional neural networks and existing methods were stacked up through box plots and Kolmogorov-Smirnov tests,*** increases imply improved systematization properties in underwater image classification *** image classification model offers important performance advantages and better stability compared with existing methods.

关键词： underwater image classification EfficientnetB0 random vector functional link convolutional neural network

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聚四氟乙烯材料切削工艺和应用研究进展

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中国机械工程 2024年第3期35卷 498-514页

作者：倪敬崔智何利华付新朱泽飞杭州电子科技大学机械工程学院杭州310018 浙江大学流体动力与机电系统国家重点实验室杭州310027

聚四氟乙烯(polytetrafluoroethylene,PTFE)因其优异的物理化学性能而成为生产制造电子通信、航空航天等领域关键零部件的重要材料。相比模压烧结工艺,切削工艺能够更高效地加工结构较为复杂的PTFE零部件。然而,PTFE材料具有韧性强、回... 详细信息

聚四氟乙烯(polytetrafluoroethylene,PTFE)因其优异的物理化学性能而成为生产制造电子通信、航空航天等领域关键零部件的重要材料。相比模压烧结工艺,切削工艺能够更高效地加工结构较为复杂的PTFE零部件。然而,PTFE材料具有韧性强、回弹性高、导热性差和线膨胀系数大等特点,使得其切削加工质量难以保证,在一些特殊领域,对PTFE零部件的表面洁净度更是有极高的要求,这些都对PTFE材料的切削工艺提出了新的挑战。从PTFE材料的基础力学和物理化学等特性出发,总结了PTFE材料的切削加工性;结合聚合物切削理论及其研究方法分析了PTFE材料的切削去除机理;阐述了PTFE及其复合材料的车、铣、钻等切削加工工艺;最后概述了PTFE材料切削工艺在相关重要领域的应用现状,并从材料性能研究、基础切削理论研究、切削工艺探索等方面总结了现有研究和应用中存在的问题,对未来研究的发展趋势和研究重点进行了展望。

关键词：聚四氟乙烯切削机理切削工艺力学性能

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Large Eddy Simulation of Micro-Particles Transport with Different Mass Flow Rate in Turbulent Planar Jet Flow

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Journal of Thermal Science 2012年第6期21卷 572-576页

作者： LIN Peifeng WU Dichong zhu zefei Faculty of Mechanical Engineering and Automation Zhejiang Sci-Tech University Hangzhou 310018 China Business Administration College Zhejiang University of Finance and Economic Hangzhou 310018 China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou 310018 China

The motion of micro-particles with different mass flow rate in the planer turbulent jet flow has been simulated, using LES method to obtain the flow vorticity evolution and Lagrangian method to track micro-particles. The re- suits showed that when the flow rate is small, the particles more likely to present in the vortex periphery, the dis- tribution pattern is similar to the flow pattern. When the flow rate is high, some particles will escape from the mo- tion region to the original static region, so that in the jet region, particles are relatively evenly distributed. When the flow field is full developed, the particles average concentration in the y direction affected by the mass flow rate relative slightly, the normalized mean particles concentrations at different flow rate were similar to Gaussian shape.

关键词： Large eddy simulation turbulent jet flow micro-particle mass flow rate

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Improved Fatigue and Damage Tolerant Material Design for Aerospace Industry

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Journal of Materials Science & Technology 2005年第6期21卷 856-862页

作者： Yigeng XU Jiang CHEN Jianmin LI zefei zhu School of Aerospace Automotive and Design Engineering University of Hertfordshire Hatfield Herts AL109AB UK Zhejiang University of Technology Hangzhou 310014 China Zhejiang Institute of Science and Technology Hangzhou 310033 China

Various micro-mechanical and micro-structural influences on fatigue crack growth resistance of the material have been investigated over the years. It is widely recognized that resistance to fatigue crack growth can be differentiated into ‘intrinsic＇ and ‘extrinsic＇. The separation of intrinsic and extrinsic crack growth resistance has constituted a major theme of fatigue research in the last 30 years, with the concept of crack closure or crack tip shielding being used to rationalize a wide range of micro-structural and mechanical influences on fatigue crack growth behavior. An accurately quantitative understanding of intrinsic and extrinsic effects on crack growth is essential to directed alloy design for improved fatigue resistance, and/or improved structural service life. This paper presents a compliance-based crack closure measurement method and a multi-mechanism based analytical model for the separation of intrinsic and extrinsic material fatigue resistance, with application in characterizing the fatigue performance of two high strength damage tolerant airframe AI alloys.

关键词： Fatigue Crack closure Alloy design

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Asymptotic analysis of nonlinear micro-film buckling

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Science China(Technological Sciences) 2012年第7期55卷 1960-1963页

作者： YING ZuGuang WANG Yong zhu zefei Department of Engineering Mechanics School of Aeronautics and AstronauticsZhejiang UniversityHangzhou 310027China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

The buckling design of micro-films has various potential applications to *** substrate prestrain,interconnector buckling amplitude and critical strain are important parameters for the buckling *** the presented analysis,the buckled film shape was described approximately by a trigonometric function and the buckled film amplitude was obtained by minimizing the total strain ***,this method only generates the first-order approximate solution for the nonlinear *** the present paper,an asymptotic analysis based on the rigorous nonlinear differential equation for the buckled micro-film deformations is proposed to obtain more accurate relationship of the buckling amplitude and critical strain to *** obtained results reveal the nonlinear relation and are significant to accurate buckling design of micro-films.

关键词： buckling nonlinearity micro-film asymptotic solution critical strain

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Underwater Image Classification Based on EfficientnetB0 and Two-Hidden-Layer Random Vector Functional Link

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中国海洋大学学报（自然科学英文版） 2024年第2期

作者： ZHOU Zhiyu LIU Mingxuan JI Haodong WANG Yaming zhu zefei

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基于NSGA-Ⅱ算法的微通道结构参数优化

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杭州电子科技大学学报（自然科学版） 2024年第4期44卷 94-102页

作者：王康宁陈宸杜加友王瑞金朱泽飞杭州电子科技大学机械工程学院浙江杭州310018

随着集成电路技术的迅速发展,电子芯片的发展趋势逐渐朝向高度集成、微型化以及多核化的方向,这导致芯片在工作时产生的热量急剧增加。由于不同核心产生的发热量不同,因此需要针对不同核心的发热情况来有效解决散热问题。本文的研究重... 详细信息

随着集成电路技术的迅速发展,电子芯片的发展趋势逐渐朝向高度集成、微型化以及多核化的方向,这导致芯片在工作时产生的热量急剧增加。由于不同核心产生的发热量不同,因此需要针对不同核心的发热情况来有效解决散热问题。本文的研究重点是阵列芯片的分布式散热,通过设计一种多入口单出口的半开放式微通道来解决这一问题。具体来说,研究使用了微通道中的梯形肋,通过调整肋的前楔角和肋宽系数,以提高传热效率并控制压降。为了找到最佳的微通道结构参数,研究采用了NSGA-Ⅱ多目标遗传算法进行优化。研究结果显示,与未经优化的微通道相比,优化后的微通道结构在相同泵功率下Nusselt数(Nu数)提高了30%,微通道内的温度分布更加均匀。

关键词：微通道热沉分布式热源数值模拟多目标优化

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Large Eddy Simulation of the Particle Coagulation in High Concentration Particle-Laden Planar Jet Flow

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 947-956页

作者： LIN Peifeng WU Dichong YU Mingzhou WANG Chao ZHANG Lite zhu zefei Faculty of Mechanical Engineering ＆ Automation Zhejiang Sci-Tech University Hangzhou 310018 China Business Administration College Zhejiang University of Finance and Economics Hangzhou 310000 China Department of Physics China Jiliang University Hangzhou 310018 China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou 310018 China

Particle coagulation by Brownian motion is an important but difficult research *** particle volume concentration is larger than 0.1%,the classic SMOLUCHOWSKI equation is not applicative *** high concentration coagulation,with HEINE＇s correction,source terms for the Taylor-series expansion method of moments（TEMOM） are firstly driven in this ***-fine particle（d0？100 mm） with initial volume fraction f？1% coagulation in a planar jet turbulence flow is simulated via the large eddy simulation（LES）.The instantaneous and time-averaged particle distributions and the high concentration enhancement are given *** particle number concentration distribution results show that the coagulation is more intense comparing to dilute case in previous research,especially near the nozzle *** jet flow is fully developed,the effect is much more obvious at the region between *** time-averaged γ（the high concentration enhance factor） distributes sharply and symmetrically about the jet centerline at the upstream,but becomes broad and flat at downstream where the cross-stream averaged γ fluctuates *** a new attempt,this paper shows Brownian coagulation with high concentration also can be calculated via TEMOM appropriately,and the coagulation at the region between vortexes is about 1.38 times intensive of the dilute result calculated by the classic Smoluchowski theory.

关键词： Coagulation LES Planar jet flow High concentration enhancement

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日间手术高质量发展瓶颈突破策略SWOT分析

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中国卫生标准管理 2024年第7期15卷 67-71页

作者：魏薇孙振涛何士凤朱泽飞王宁曹亚楠郑州大学第一附属医院麻醉与围术期医学部河南郑州450000

目的分析日间手术运营管理创新方面的优势、劣势、机会和威胁,探索其潜在问题并制订相应的发展策略。方法2022年9月—2023年9月郑州大学第一附属医院采用SWOT分析方法,结合相关文献综述和专家意见,对日间手术高质量发展管理创新进行评... 详细信息

目的分析日间手术运营管理创新方面的优势、劣势、机会和威胁,探索其潜在问题并制订相应的发展策略。方法2022年9月—2023年9月郑州大学第一附属医院采用SWOT分析方法,结合相关文献综述和专家意见,对日间手术高质量发展管理创新进行评估。结果日间手术可以缩短住院时间、减少床位需求,降低医疗成本、减轻患者的经济负担、提高手术效率和患者满意度。劣势在于术后需要完善的完全保障服务。机会在于有政策支持,新型手术设备和智能化管理系统的应用,社会对降低医疗费用的需求。威胁主要在于日间手术设施、人员配置和管理经验方面存在不足,另外还涉及手术风险、患者安全和法律责任等问题。结论日间手术需要借助科技创新,加强人员培训和设备更新,完善管理和运营机制,关注患者的术后护理需求,以促进管理创新和高质量发展。

关键词：日间手术运营管理 SWOT分析高质量发展瓶颈突破策略

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Nanoparticle Transportation and Brownian Diffusion in Planar Jet Flow via Large Eddy Simulation

引用

Open Journal of Fluid Dynamics 2012年第4期2卷 354-358页

作者： Peifeng Lin Dichong Wu zefei zhu Business Administration College Zhejiang University of Finance and Economic Hangzhou China Faculty of Mechanical Engineering and Automation Zhejiang Sci-Tech University Hangzhou China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou China

The nanoparticle transportation and Brownian diffusion in planar jet flow is simulated via large eddy simulation in this work. To thorough compare the Brownian diffusion with different particle size, we computed three particle diameter dp = 1 nm, 10 nm and 50 nm in one simulation process simultaneously. The numerical results showed that at the flow de- veloping stage, the particle mass concentration pattern develops as the flow vorticity develops. The distribution is nearly uniform at the lower reaches of the nozzle exit. When the jet flow is developing on, vortexes always carry the particle from upstream to downstream, from the central axis region to the outer mixing layer of jet. At the front of the jet flow, particles distribute more homogeneous for they have more residence time to diffuse from higher concentration region to the lower concentration region. The time averaged particle concentration distribution patterns are similar to Gaussian distribution form. The maximum concentration contributed by diffusion is present at the mixing layer near the nozzle exit. The farther away from the nozzle exit in the cross-stream direction, the smaller the concentration is. The maximum concentration contributed by diffusion is several orders smaller than that contributed by flow convection.

关键词： Large Eddy Simulation Planar Jet Flow Nanoparticle Evolution Diffusion

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