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基于机器视觉的机织物耐静水压性能检测

现代纺织技术 2024年第1期32卷 18-26页

作者：倪嘉陆王若雯石文慧袁志磊徐平华浙江理工大学服装学院杭州310018 上海海关上海200135 浙江理工大学浙江省服装工程技术研究中心杭州310018 浙江理工大学丝绸文化与产品设计数字化技术文化和旅游部重点实验室杭州310018

为提升机织物静水压检测效率,实现静水压自动评级,在优化视频采集模块的基础上,利用改进的背景差分法,对不同表观机织物静水压性能进行测试和分析。利用3D打印技术,实现采集设备和光源的封装;实时对视频帧进行掩膜、去噪和分割处理,以... 详细信息

为提升机织物静水压检测效率,实现静水压自动评级,在优化视频采集模块的基础上,利用改进的背景差分法,对不同表观机织物静水压性能进行测试和分析。利用3D打印技术,实现采集设备和光源的封装;实时对视频帧进行掩膜、去噪和分割处理,以获得稳定有效的观测区域;利用优化更新背景策略的背景差分法,结合高斯混合模型,实现织物出水位置和帧位的实时记录,进而换算出织物耐静水压值。结果表明:该方法总体优于常规背景差分法、高斯混合模型背景差分法;对纯色和宽条格织物检测表现良好,误差在0.37%~2.77%;但对于细密的规则条纹和不规则印花织物误差较大,误差率在9.27%以上。该方法能够有效地检测纯色和部分规则花纹织物,对复杂表观织物的适用性有待提升。

关键词：机织物静水压抗渗水性水珠高斯混合模型

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Advanced Analysis of HVDC Electrodes Interference on Neighboring Pipelines

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Journal of Power and Energy Engineering 2015年第4期3卷 332-341页

作者： Yu Gong Chunlin Xue zhilei yuan Yexu Li Farid Paul Dawalibi China Southern Power Grid Guangzhou China Huadong Power Design Institute Shanghai China Safe Engineering Services & Technologies ltd. Laval Quebec Canada

This paper focuses on advanced analysis techniques and design considerations of DC interference generated by HVDC electrodes during normal bipolar and temporary monopolar operations on neighboring metallic utilities, with a special emphasis on buried gas and oil pipelines. This study examines the level of pipeline corrosion, the safety status in the vicinity of exposed appurtenances and the impact of DC interference on the integrity of insulating flanges and impressed current cathodic protection (ICCP) systems. Computation results obtained for different soil models show that different soils can lead to completely different DC interference effects. The results and conclusions presented here can be used as a reference to analyze the severity of DC interference on pipelines due to proximate HVDC electrodes.

关键词： HVDC Electrode DC Interference Pipe-to-Soil Potential Polarization Potential Insulating Joint (Flanges) Rectifier Touch Voltage Corrosion Safety Impressed Current Cathodic Protection

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纺织品电磁屏蔽效能评价标准的现状分析

纺织学报 2016年第2期37卷 170-176页

作者：吴雄英张亚雯袁志磊上海出入境检验检疫局上海200135 东华大学纺织学院上海201620

有效地检测和评价防电磁辐射纺织品是产品开发和应用的关键,通过介绍防电磁辐射纺织品的电磁屏蔽原理及屏蔽效能评价方法的现状和发展趋势,比较分析防电磁辐射纺织品标准的评价指标、测试方法等,探讨了我国现有民用防电磁辐射标准和测... 详细信息

有效地检测和评价防电磁辐射纺织品是产品开发和应用的关键,通过介绍防电磁辐射纺织品的电磁屏蔽原理及屏蔽效能评价方法的现状和发展趋势,比较分析防电磁辐射纺织品标准的评价指标、测试方法等,探讨了我国现有民用防电磁辐射标准和测试方法存在的问题。指出应不断完善防电磁辐射纺织品的标准,进一步明确民用防电磁辐射服装需达到的屏蔽效能要求,并根据服装的结构特点建立合适的防电磁辐射性能综合评价方法,为防电磁辐射纺织品的开发、市场监管提供合理的检测和评价依据。

关键词：纺织品防电磁辐射屏蔽效能评价方法标准

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基于以太网的宽带接入技术

世界电信 2002年第1期15卷 31-33,42页

作者：袁志雷深圳飞通光电股份有限公司系统事业部开发分部

作为局域网技术的以太网如果应用到公共的接入网中,需要解决安全性、用户管理、带宽管理、计费、网络维护管理以及供电等问题。2001年7月,信息产业部电信传输所接入网标准研究组讨论通过了《接入网技术要求———基于以太网的宽带接入网... 详细信息

作为局域网技术的以太网如果应用到公共的接入网中,需要解决安全性、用户管理、带宽管理、计费、网络维护管理以及供电等问题。2001年7月,信息产业部电信传输所接入网标准研究组讨论通过了《接入网技术要求———基于以太网的宽带接入网》,该标准对用户侧设备和局侧设备的基本功能作了描述。

关键词：以太网宽带接入技术计算机网络

Robustness of the octupole collectivity in 144Ba within the cranking covariant density functional theory in 3D lattice

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Nuclear Science and Techniques 2024年第8期35卷 124-131页

作者： Ze‑Kai Li yuan‑yuan Wang Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Hebei Key Laboratory of Physics and Energy Technology North China Electric Power UniversityBaoding 071000China

The octupole deformation and collectivity in octupole double-magic nucleus 144Ba are investigated using the Cranking covariant density functional theory in a three-dimensional lattice *** reduced B(E3)transition probability is implemented for the first time in semiclassical approximation based on the microscopically calculated electric octupole *** available data,including the I-ωrelation and electric transitional probabilities B(E2)and B(E3)are well ***,it is shown that the ground state of 144Ba exhibits axial octupole and quadrupole deformations that persist up to high spins(I≈24h).

关键词： Octupole collectivity Cranking covariant density functional theory Rotational spectrum Electric transitional probabilities

Collective Molecular Machines: Multidimensionality and Reconfigurability

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Nano-Micro Letters 2024年第8期16卷 309-340页

作者： Bin Wang yuan Lu Department of Chemical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Molecular machines are key to cellular activity where they are involved in converting chemical and light energy into efficient mechanical *** the last 60 years,designing molecular structures capable of generating unidirectional mechanical motion at the nanoscale has been the topic of intense *** progress has been made,attributed to advances in various fields such as supramolecular chemistry,biology and nanotechnology,and ***,individual molecular machines are only capable of producing nanometer work and generally have only a single *** order to address these problems,collective behaviors realized by integrating several or more of these individual mechanical units in space and time have become a new *** this review,we comprehensively discuss recent developments in the collective behaviors of molecular *** particular,collective behavior is divided into two *** is the appropriate integration of molecular machines to efficiently amplify molecular motions and deformations to construct novel functional *** other is the construction of swarming modes at the supramolecular level to perform nanoscale or microscale *** discuss design strategies for both modes and focus on the modulation of features and ***,in order to address existing challenges,the idea of transferring experience gained in the field of micro/nano robotics is presented,offering prospects for future developments in the collective behavior of molecular machines.

关键词： Molecular machines Collective control Collective behaviors DNA Biomolecular motors

MAUN:Memory-Augmented Deep Unfolding Network for Hyperspectral Image Reconstruction

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1139-1150页

作者： Qian Hu Jiayi Ma yuan Gao Junjun Jiang Yixuan yuan Electronic Information School Wuhan UniversityWuhan 430072China School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China Department of Electronic Engineering Chinese University of Hong KongHong Kong 999077China

Spectral compressive imaging has emerged as a powerful technique to collect the 3D spectral information as 2D *** algorithm for restoring the original 3D hyperspectral images(HSIs)from compressive measurements is pivotal in the imaging *** approaches painstakingly designed networks to directly map compressive measurements to HSIs,resulting in the lack of interpretability without exploiting the imaging *** some recent works have introduced the deep unfolding framework for explainable reconstruction,the performance of these methods is still limited by the weak information transmission between iterative *** this paper,we propose a Memory-Augmented deep Unfolding Network,termed MAUN,for explainable and accurate HSI ***,MAUN implements a novel CNN scheme to facilitate a better extrapolation step of the fast iterative shrinkage-thresholding algorithm,introducing an extra momentum incorporation step for each iteration to alleviate the information ***,to exploit the high correlation of intermediate images from neighboring iterations,we customize a cross-stage transformer(CSFormer)as the deep denoiser to simultaneously capture self-similarity from both in-stage and cross-stage features,which is the first attempt to model the long-distance dependencies between iteration *** experiments demonstrate that the proposed MAUN is superior to other state-of-the-art methods both visually and *** code is publicly available at https://***/HuQ1an/MAUN.

关键词： Deep folding iteration

Gradient microstructure and superior strength-ductility synergy of AZ61 magnesium alloy bars processed by radial forging with different deformation temperatures

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Journal of Materials Science & Technology 2024年第3期170卷 65-77页

作者： Jingfeng Zou Lifeng Ma Yanchun Zhu Ling Qin yuan yuan School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Heavy Machinery Engineering Research Center of the Ministry Education Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Engineering University of HullCottingham RdHull HU67RXUK National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

Gradient microstructure modification is a cost-efficient strategy for high strength without compromising ductility,which is urgently needed in the fundamental science of engineering *** this study,heterogeneous structures of AZ61 alloy bars with anisotropic gradients(with different grain size distributions from the surface to the center)were observed to exhibit strong strength-ductility synergies under different deformation tem *** results reveal that the grain refinement process under mediumlow temperature deformation conditions(≤350℃)consists of four transition stages along the radial direction,i.e.,twin activations and deformation band formations,dislocation cells and pile-ups,ultrafine sub-grains,and randomly orientated quasi-micron *** deformation temperatures have a great influence on twin activations and deformation band formations,and the high temperature can easily provoke the initiation of non-basal *** deformation bands were determined as a primary nucleation site due to their highly unstable dislocation hindrance *** in combination with the Radial forging(RF)deformation process,the differences of dynamic precipitates can be attributed to microstructural difference and solubility limit of Al at different tem *** summarizing the tensile test results,the sample forged at 350℃exhibited the best strength-ductility synergy,exhibiting the highest elongation(EL)of 23.2%with a 251 MPa yield strength(YS)and 394 MPa ultimate tensile strength(UTS)in center region,and combined with the highest strength value of 256 MPa YS and 420 MPa UTS in the center region,while the EL was slightly degraded to 19.8%.

关键词： Gradient microstructure Radial forging Strength-ductility synergy Magnesium alloy Strengthening mechanism

Pyrolysis Empirical Modeling of Polyester Glass Fiber Reinforced Plastics Using Sestak-Berggren Model Method

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Journal of Thermal Science 2024年第2期33卷 725-738页

作者： NAN Wei JI Wenhui yuan Yanping yuan Zhongyuan SUN Yong School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China CRRC Changchun Railway Vehicles Co. LtdChangchun130062China

Polyester Glass Fiber Reinforced Plastic(Polyester GFRP),a thermosetting plastic comprised of glass fiber and polyester polymer compounds,is extensively utilized in high-speed *** its pyrolysis mechanism is crucial as it significantly influences the combustion characteristics and fire safety ***,kinetic research on polyester GFRP primarily focuses on employing the Coats-Redfern method to derive a theoretical kinetic ***,the pyrolysis process of polyester GFRP is complex and the aforementioned theoretical model fails to accurately describe the pyrolysis ***,this study seeks to utilize the Sestak and Berggren(SB) model as a methodological approach to reveal the complex reaction mechanism during the pyrolysis *** on thermogravimetric analysis,the entire pyrolysis process of polyester GFRP is divided into two primary ***,model-free methods are employed to ascertain the activation energy and pre-exponential *** results show that the fitted empirical models of the two main pyrolysis stages are f(α)=(1-α)^(1.47)[-ln(1-α)]^(1.50) and f(α)=(1-α)^(1.77)[-ln(1-α)]^(1.72),*** predicted results are in good agreement with experimental data under different heating rates,which indicates that the empirical model can sufficiently describe the pyrolysis process of polyester GFRP.

关键词： polyester GFRP model-fitting methods empirical models pyrolysis