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Phase unwrapping based on self-attention dense residual network

Optics & Laser technology 2025年 191卷

作者： Zhongyang Wang Hongwei Ma Yuan Chen Quan Wang College of Mechanical Engineering Xi’an University of Science and Technology Xi’an Shaanxi 710054 PR China Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Detection and Control Xi’an University of Science and Technology Xi’an Shaanxi 710054 PR China College of Sciences Xi’an University of Science and Technology Xi’an Shaanxi 710054 PR China

Phase unwrapping, a critical step in obtaining holographic information, plays a significant role in the field of digital holography, particularly in applications such as fringe projection for 3D imaging, synthetic aperture radar, and magnetic resonance imaging. Traditional phase unwrapping algorithms often suffer from error accumulation, high computational costs, and poor performance in low signal-to-noise ratio (SNR) environments. To address these issues, this paper proposes a novel deep learning framework, named as Self-Attention Dense Residual Network (SA-DRNet), for phase unwrapping. To obtain continuous phase, we initially employed a dense network for multiple extractions of phase features. However, to alleviate the phase discontinuities and phase jumps caused by gradient issues, we integrated residual connections within the dense network. Finally, we incorporated a self-attention module to enhance the global phase information restoration, including the background phase, thereby achieving high-precision phase acquisition. Additionally, we established an off-axis digital holographic optical system to capture the holograms of the USAF resolution test target and artificial ink dots. Finally, the robustness of the proposed algorithm under severe noise conditions was first verified through numerical simulations, followed by experimental validation of its effectiveness.

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Magnetic Spring and Its Application in Fuze

Magnetic Spring and Its Application in Fuze

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Artificial Intelligence and electromechanical Automation (AIEA), International Conference on

作者： Haoyuan Yu Li Sui Xinyuan Bian Qiaoran Zhao School of Mechatronical Engineering Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Reactor Engineering Technology Research Department Chinese Academy of Atomic Energy Beijing China

ISBN: (数字)9781728182889

ISBN: (纸本)9781728182896

During the working process of the fuze insurance institution, the metal coil spring as a resistance element may cause failure due to fatigue fracture and stress creep relaxation, thereby affecting the reliability and stability of the fuze safety system. To solve this problem, a kind of variable stiffness spring with negative stiffness characteristic is proposed in this paper, which is composed of two magnets. This spring has the advantages of simple structure and rich stiffness characteristics. It is used in fuze recoil insurance institutions to meet the requirements of fuze security system service handling security and reliable release of insurance at launch, providing new features for improving the performance of fuze insurance institutions Technical approach.

关键词： magnetic spring moving magnet steady state safety moving magnet resistive element insurance Steady state safety springs Device Spring Spring season institutions Fatigue fracture simple structures

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Photothermal conversion of CO 2 to fuel with nickel-based catalysts: A review

Environmental Functional Materials

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Environmental Functional Materials 2022年第2期1卷 204-217页

作者： Yiling He Yi Zhou Ji Feng Mingyang Xing State Environmental Protection Key Lab of Environmental Risk Assessment and Control on Chemical Processes. School of Resources & Environmental Engineering East China University of Science and Technology Shanghai 200237 China Department of Mechanical Engineering University of California Riverside Riverside CA 92521 USA Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry & Molecular Engineering East China University of Science & Technology 130 Meilong Road Shanghai 200237 China

Converting CO 2 to fuel is a promising strategy to mitigate the greenhouse effect and achieve ‘carbon neutrality’. Photothermal catalysis has been widely used for CO 2 reduction because it effectively reduces the apparent activation energy of the reaction and provides milder catalytic conditions as well as higher catalytic efficiency than conventional catalytic methods. In this review, the basic principles of photothermal catalytic CO 2 reduction and the factors used to evaluate photothermal catalytic conversion efficiency are introduced. Then, the common types of Ni-based catalysts and their design strategies are summarized and discussed. Among these catalysts, metal oxides have been extensively studied and developed. Accordingly, they currently achieve product yields up to the mmol/(g·h) level. Strategies such as elemental doping and morphology control are often adopted for the modification of photothermal catalysts as a means to improve catalytic performance. Finally, future trends in the field of photothermal catalytic CO 2 reduction are proposed, including mechanistic studies, practical applications, and coupling with other carbon-neutral technologies.

关键词： CO 2 reduction Photothermal catalysis: Ni-based catalyst Selectivity Metal complex

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Theoretical analysis and experimental study of a perforated piezoelectric cantilever

Theoretical analysis and experimental study of a perforated ...

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第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Huaiwei Su Li Sui Ping Song Yousong Lu School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

Piezoelectric energy harvesters have been studied extensively because they show considerable promise for use in both military and commercial applications. In order to improve the output capability of the piezoelectric energy harvester, the perforated piezoelectric cantilevers were designed in this work. To study how the hole on the cantilever affected the output characteristics, this paper analysed the position and size of the hole separately. The results show that, perforating the cantilever can cause stress concentration of the piezoelectric cantilever, and improve the output capacity.

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Design, Simulation and Fabrication of a Time-Delay Device Based on Micro-Channel

Design, Simulation and Fabrication of a Time-Delay Device Ba...

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第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Qiaoran Zhao Li Sui Ping Song School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

With the development of micro-machining technology, the application of microchannel is becoming more and more popular. In this paper, we design a set of time-delay device based on micro-channel and micro-fluidics technology. This paper describes the timedelay device's working principle and analyses the micro-channel's flow characteristics by simulation method based on Coventerware. From studies on the micro-channel's cross section, geometry and dimension parameters, the micro-channel's optimal form and dimension can be obtained. Finally, this paper chooses ultra-machining process to fabricate the time-delay device.

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Numerical model of direct internal reforming SOFC: A Comparison between Anode-support and Metal-support 16

Numerical model of direct internal reforming SOFC: A Compari...

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16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019

作者： Wang, Y. Ren, J. Shi, Y. Li, X. National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781607688747

Direct internal reforming (DIR) operation provides many benefits for solid oxide fuel cells (SOFCs) by eliminating the need for an extra reformer. Anode-supported SOFCs (AS-SOFCs) are commonly used for DIR operations. However, the strong endothermic reforming reactions at the cell entrance may result in large thermal stresses and lead to premature failure. In this study, a two-dimensional model was developed to analyze the differences between the AS-SOFC and the new generation metal-supported SOFC (MS-SOFC) in DIR operations. The model considered the coupling effects of the chemical/electrochemical reactions, the mass/charge/heat transport processes and the thermal mechanical stress. The distributions of temperature, species composition, current density and thermal stress were determined and compared for both structures. The failure probability of the cell was estimated by stress distributions. The results showed that the MS-SOFC led to a gentler temperature distribution and a smaller failure probability with slight performance increase compared to the AS-SOFC. © The Electrochemical Society.

关键词： Solid oxide fuel cells (SOFC)

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Dome-shaped tactile sensor for detecting object stiffness and potential

Dome-shaped tactile sensor for detecting object stiffness an...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Yue Feng Kehang Zhong Zhilong Zhou Yanhui Han Science and Tehnology on Electromechanical Dynamic Control Labortary School of Mechatronical Engineering Beijing Institute of Technology Beijing China Beijing Orient Insititute of Measurement and Test Beijing China

ISBN: (数字)9781728180250

ISBN: (纸本)9781728180267

Multi-functional tactile sensors, capable of measuring multi-physical quantities in a limited space by one structure, have aroused great research interest. This paper proposes a monostable dome-shaped sensor for the simultaneous measurement of the stiffness and surface potential of the object at the same position. In the proposed sensor, the top electrode is a flexible spherical stainless steel dome, and the bottom electrode is a circular sheet covered with an electret film, providing a bias electric field. Output Voltages between two electrodes are generated because of the electrostatic effect, and resulting waveforms can be measured as the proposed sensor contacts and releases the object. While the proposed sensor approaches the object, the surface potential of the object determines the voltage waveform. After contacting the object, the voltage waveform indicates a direct comparison of stiffness between the object and top electrode, based on the monostable buckling of the dome. Here, we present theoretical and experimental relationships between measured voltages obtained from the proposed sensor and a charged electret film on the surface of the object. The proposed sensor makes it possible to measure the stiffness and surface potential of the object using voltage waveforms.

关键词： TV Radio frequency Erbium

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Method of extracting gear fault feature based on stacked autoencoder

Method of extracting gear fault feature based on stacked aut...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Liu, Shuo Liu, Yulong Gu, Yuhai Xu, Xiaoli Key Laboratory of Electromechanical Measurement and Control Beijing Information Science and Technology University Beijing China

Gear and its transmission are widely used in different transmission systems, and its complicated and changeable condition brings a series of problems to the fault feature extraction and diagnosis. In recent years, deep learning techniques have been gradually applied to feature extraction and pattern recognition, and the features of feature extraction and fault diagnosis in complex working environments have shown certain advantages. This study is based on stacked autoencoder under deep learning model, and improve training network performance by modified activation function. Through the network training before and after the experiment done, and to extract the fault feature data comparison in testing, improving network after activation function to extract fault features showed a greater advantage, can be a very good application in practical fault feature extraction. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Feature extraction

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Research on Performance Evaluation Method of UAV Multi-Source Data Fusion Based on Credibility

Research on Performance Evaluation Method of UAV Multi-Sourc...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Hua-pin Geng Jia-hui Tong Beijing Electromechanical Engineering Institute Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (数字)9781728180250

ISBN: (纸本)9781728180267

Based on the analysis of aircraft multi-source test data and the characteristics of common data fusion methods, this paper puts forward a multi-source data fusion performance evaluation process model based on credibility, and studies the key points of test data pre-processing and compatibility test Methods, credibility analysis methods and multi-source test data fusion methods based on credibility, focusing on the credibility analysis method of multi-source data based on evidence distance and the credibility analysis method based on consistency analysis, from the perspective of reliability, objectively measure the weight of multi-source data in fusion, and carry out typical Validation to test the effectiveness of the multi-source test data fusion performance evaluation method based on credibility.

关键词： Quality function deployment Xenon Rail to rail outputs

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Experimental Study on Adsorption-Deformation-Seepage of Co2, Ch4, and N2 in Anthracite

SSRN

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SSRN 2022年

作者： Jia, Jinzhang Wu, Yumo Zhao, Dan Li, Bin Wang, Dongming College of Safety Science and Engineering Liaoning Technical University Liaoning Fuxin123000 China Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education Liaoning Technical University Liaoning Huludao125105 China Faculty of Civil Engineering and Architecture Zhanjiang University of Science and Technology Guangdong Zhanjiang524000 China School of Environmental and Chemical Engineering Shenyang Ligong University Shenyang110159 China

The adsorption capacity, deformation, and permeability of coal are the key factors that affect coalbed methane yield and CO 2 geological storage. To explore the adsorption-deformation-seepage mechanism of coal, this paper takes anthracite as the research object and uses the coal rock adsorption-deformation-seepage test platform under multi-physical field conditions to conduct an adsorption-deformation-seepage experimental study of columnar anthracite through the adsorption of CO 2 , CH 4 , and N 2 under stress. The results showed that the adsorption capacity and deformation of anthracite for CO 2 gas were the largest, followed by CH 4 and N 2 . An increase in the adsorption pressure showed an initial decrease and then increase in the permeability of anthracite. The critical pressure points of CO 2 /CH 4 /N 2 gas permeabilities in anthracite were about 2.0 MPa, 1.75 MPa, and 1.5 MPa, respectively. N 2 showed the greatest permeability, followed by CH 4 and CO 2 . Improvements in the dynamic prediction models of adsorption capacity, coal deformation, and permeability based on the law of adsorption-deformation-seepage of coal were established. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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