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Optimal overlays for preservation of concrete in cold climate: decision-making by the method of fuzzy comprehensive evaluation combined with AHP

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Journal of Infrastructure Preservation and Resilience 2021年第1期2卷 1-16页

作者： Li, Zhipeng Dang, Yudong Tang, Zhen Xie, Ning Lu, Shuang Shi, Xianming Department of Civil & amp Environmental Engineering Washington State University PullmanWA99164-2910 United States Yunnan Key Laboratory of Building Structure and New Materials Yunnan Institute of Building Research Kunming650223 China Key Lab of Structure Dynamic Behavior and Control Ministry of Education Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Shandong Jinan250022 China

Overlays have been extensively employed as an effective preservation or rehabilitation tool to extend the service life of concrete bridges and pavements, especially concrete slabs suffering from salt scaling and abrasion. However, limited attention has been paid to the durability and performance of these overlays which can be jeopardized when they are exposed to freeze/thaw and wet/dry cycles, deicer applications, studded tires, and their coupled effects. Various overlays feature different engineering properties, and they might be only effective in specific service environments but not in others, and research is lacking to examine their ability to adapt to different environments. This study subjected five overlay products on concrete slabs to the combined action of freeze/thaw (F/T) and wet/dry (W/D) cycles with periodical exposure to either 15 wt.% NaCl solution or 15 wt.% MgCl2 solution, to simulate the typical field scenarios in an accelerated manner. The bond strength, splitting tensile strength, and abrasion resistance of the overlaid concrete slabs were tested to evaluate the effectiveness of various overlays against the deicer scaling and the abrasion by studded tires. Based on the experimental data, this study demonstrated a multi-criteria decision-making method, fuzzy comprehensive evaluation (FCE) combined with analytic hierarchy process (AHP), for the selection of optimal overlays in three different service scenarios (e.g., states of Washington and Oregon [USA] and British Columbia [Canada]). The analysis results indicate that one epoxy overlay exhibited the comprehensively best performance and could be a promising candidate in all three given scenarios, another polymer overlay took second place, while the adaptability of the three cement-based overlays varied in different environments. Graphical Abstract: (Figure presented.). © The Author(s) 2021.

关键词： Sodium chloride

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A Multi-Objective Discrete Social engineering Optimizer for a Disassembly Line Balancing Problem 19

A Multi-Objective Discrete Social Engineering Optimizer for ...

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19th IEEE International Conference on Networking, Sensing and control, ICNSC 2022

作者： Tian, Guangdong Zhang, Cheng Zhang, Lele Yuan, Gang Kang, Qi School of Transportation Jilin University of Architecture and Technology Changchun130114 China School of Mechanical-Electrical and Vehicle Engineering Beijing University of Civil Engineering and Architecture Beijing100044 China School of Mechanical Engineering Shandong250012 China Transport Management Institute Ministry of Transport of the P.R.China Beijing101601 China Jiangsu University Key Laboratory of Theory and Technology of Intelligent Agricultural Machinery and Equipment Zhenjiang212000 China Tongji University Department of Control Sciences and Engineering Shanghai201804 China

ISBN: (纸本)9781665472432

Product disassembly is the key part of recycling and remanufacturing. Disassembly line balancing problem (DLBP) is an important part in the product disassembly process. This study develops a multi-objective discrete social engineering optimizer (SEO) as a new extension to the original SEO. In order to enable the algorithm to formulate the discretization rules, a swap operator and swap sequence are introduced, and three sequence operation operators are defined. Finally, the algorithm is used to solve the disassembly of a worm reducer, and 12 feasible task allocation schemes are obtained. Findings show the effectiveness solving DLBP, and the superiority of the proposed method is verified. © 2022 IEEE.

关键词： Balancing

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Reinforcement Learning Tracking control for Unknown Continuous Dynamic Systems 10

Reinforcement Learning Tracking Control for Unknown Continuo...

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10th IEEE Data Driven control and Learning Systems Conference, DDCLS 2021

作者： Ye, Linqi Li, Jiayi Wang, Changliang Liu, Houde Liang, Bin Center of Intelligent Control and Telescience Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen Shenzhen518055 China Shanghai Academy of Spaceflight Technology Shanghai201109 China Navigation and Control Research Center Tsinghua University Department of Automation Beijing100084 China

ISBN: (纸本)9781665424233

Reinforcement learning tracking control (ILC) is proposed to solve the traditional iterative learning control (ILC) problem. For unknown continuous dynamic systems, precision output tracking is achieved for a given trajectory after several times of trials. The controller is composed of a feedback part and a feedforward part, where the feedback part uses linear states feedback to stabilize the system and the feedforward part is a time-dependent signal to ensure precision tracking. The desired trajectory is defined in a finite time interval and the controller is applied repeatedly to the system with the feedforward signal updated by reinforcement learning in each trial. The tracking problem is treated as a black-box optimization problem where the integral quadratic tracking error is a cost to be minimized under input constraints. In order to apply reinforcement learning, the feedforward signal is approximated by spline interpolation of a few representative points distributed uniformly along the tracking time interval. A search strategy based on squeeze theorem is adopted to update the value of the representative points to achieve minimum tracking error cost. The cart pole example illustrates the effectiveness of the proposed method. © 2021 IEEE.

关键词： Reinforcement learning

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DECOR-Net: A Covid-19 Lung Infection Segmentation Network Improved by Emphasizing Low-Level Features and Decorrelating Features

DECOR-Net: A Covid-19 Lung Infection Segmentation Network Im...

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IEEE International Symposium on Biomedical Imaging

作者： Jiesi Hu Yanwu Yang Xutao Guo Bo Peng Hua Huang Ting Ma Electronic & Informatin Engineering School Harbin Institute of Technology (Shenzhen) Shenzhen China Peng Cheng Laboratory Shenzhen China Shenzhen Center for Disease Control and Prevention Institute of Pathogen Biology Shenzhen China Department of Radiology The Third People’s Hospital of Shenzhen China

Since 2019, coronavirus Disease 2019 (COVID-19) has been widely spread and seriously threatened public health. Chest Computed Tomography (CT) holds great potential for screening and diagnosis of this disease. The segmentation of COVID-19 CT imaging can achieve a quantitative evaluation of infections and track disease progression. COVID-19 infections are characterized by high heterogeneity and unclear boundaries, so capturing low-level features such as texture and intensity is critical for segmentation. However, most existing segmentation models potentially overlook this feature. In this work, we propose a DECOR-Net capable of perceiving more diverse low-level features. The channel re-weighting strategy is applied to balance high-level and low-level features and the dependencies between channels are reduced by proposed decorrelation loss. Experiments show that DECOR-Net outperforms other cutting-edge methods and surpasses the baseline by 4.8% and 4.7% in terms of Dice coefficient and intersection over union. Moreover, the proposed decorrelation loss can constantly improve performance under different settings. The Code is available at https://***/jiesihu/***.

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Recovery of Valuable Materials from Waste Heterojunction Solar Cells: Focus on the Purification of Indium

SSRN

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SSRN 2023年

作者： Ming, Liu Lei, Wang Xinyue, Cao Jie, Fan Zhen, Zhang Peng, Quan Shitao, Wang College of Smart Energy Shanghai Jiaotong University Shanghai200240 China The College of Mechanical and Electrical Engineering Hohai University Changzhou213022 China State Key Laboratory of Photovoltaic Science and Technology Changzhou Trina Solar Co. Ltd. Changzhou213031 China Harbin Institute of Technology Department of Control Science and Engineering Harbin150001 China

The increased manufacturing of silicon heterojunction (SHJ) solar cells/panels has generated a significant rise in production waste, which contains valuable materials like indium, silver and silicon. With a high demand for these raw materials, the recovery of waste solar cells has become a crucial undertaking. While various methodologies have been explored for recycling crystalline silicon cells and leading to significant benefits through the recovery of valuable materials, a comprehensive and validated recovery process for SHJ solar cells is still lacking. This paper investigates the potential use of benign hydrometallurgical conditions for recovering valuable materials and maximizing the resource purification of metal indium from production waste SHJ cells. The results demonstrate that complete recovery of silver grids can be achieved through 10% NaOH etching at 90 ℃ for 10 min due to their low adhesion properties with the transparent conductive oxide layer. Furthermore, optimal chemical treatment conditions were adjusted to achieve efficient leaching recovery of indium. Consequently, an indium concentration of 6231.75 mg/L was obtained through the solvent extraction-stripping process, representing a 24-fold increase compared to the initial leachate concentration. Finally, a substitution reaction involving aluminum for 12 h proved promising for achieving higher indium purity and an approximated cost analysis was performed. © 2023, The Authors. All rights reserved.

关键词： Silver

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Multiple α sub-variants and anisotropic mechanical properties of an additively-manufactured Ti-6Al-4V alloy

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Journal of Materials Science & technology 2021年第11期70卷 113-124页

作者： Yinling Zhang Zhuo Chen Shoujiang Qu Aihan Feng Guangbao Mi Jun Shen Xu Huang Daolun Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada Aerospace Hiwing(Harbin)Titanium Industrial Co. Ltd.Harbin High Tech ZoneHarbin 150028China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Additive manu facturing(AM)is a promising material processing method which gains significant momentum in the aerospace and biomedical ***,the anisotropy in the mechanical properties of additively-manufactured materials is still poorly *** study was aimed at elucidating crystallographic feature-anisotropy-mechanical property relationship for a Ti-6Al-4V alloy manufactured via selective electron beam melting(SEBM).Abundantαlamellae with six variants were present inside the columnar prior-βgrains with a<100>fiber texture duringβ→αphase *** sixαvariants followed the Burgers orientation relationship of{110}_(β)//{0001}_(α)and<1-11>_(β)//<11-20>_(α).Multiple sub-variants in eachαvariant were observed for the first *** anisotropy in the mechanical properties was mainly related to the relative amount of sixα*** the horizontally-oriented samples had a lower yield strength,they exhibited a higher ductility and longer fatigue life than the vertically-oriented *** softening occurred at higher strain amplitudes,and cyclic stabilization sustained at lower strain *** crack mainly initiated from the specimen surface at lower strain amplitudes,while multiple crack initiation tended to occur at higher strain *** propagation was characterized by fatigue striations along with some secondary cracks.

关键词： Titanium alloy 3D printing Deformation behavior Anisotropy Burgers orientation relationship

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High-performance fire detection framework based on feature enhancement and multimodal fusion

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Journal of Safety Science and Resilience 2025年

作者： Zekun Zhou Hongyang Zhao Xingdong Li Yi Liu Tao Jiang Jing Jin Yanan Guo Northeast Forestry University College of Mechanical and Electrical Engineering Harbin 150042 China Harbin Institute of Technology Department of Control Science and Engineering Harbin 150001 China

Fire detection technology has become increasingly critical in the context of rising global fire threats and extreme weather conditions. Traditional methods rely on single-modal sensors and conventional image processing techniques and often struggle with complex environmental variations and background interference. This study proposes an innovative multimodal fire detection framework that integrates advanced deep learning techniques to address these limitations. By leveraging a comprehensive approach that combines YOLOv8-based object detection, HSV color space enhancement, completed local binary pattern (CLBP) texture analysis, and a novel dynamic feature enhancement module (DFEM), the proposed method significantly improves fire detection accuracy and robustness. This research introduces a sophisticated multimodal fusion strategy that systematically processes fire-related features across multiple domains. A key innovation is the cross-modality fusion mamba (CMFM) module, which employs efficient channel attention (ECA) and an efficient 2D-selective scan module (E2DSM) to dynamically integrate and refine features from different modalities. Experimental validation was conducted on a dataset that we collected, which was supplemented by data collected via real-world robotic image acquisition in diverse environments, including forests, corridors, and outdoor settings. The proposed method demonstrated exceptional performance, with a precision of 96.4%, a recall of 95.7%, and an overall accuracy of 95.8%, outperforming state-of-the-art models such as VGG16, ResNet50, YOLOv5, and YOLOv8. Ablation studies further validated the contribution of each module and highlighted the framework’s robust feature enhancement and fusion capabilities.

关键词： Fire detection Feature enhancement YOLOv8 Multimodal fusion

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Mechanisms of vortex-induced vibrations of a D-section prism at subcritical Reynolds number

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Physical Review Fluids 2025年第5期10卷 054102-054102页

作者： Weilin Chen Huan Ping Chunning Ji Md. Mahbub Alam Yan Bao National University of Singapore Department of Civil and Environmental Engineering Singapore 117576 Republic of Singapore College of Ocean Science and Engineering Shanghai Maritime University Shanghai 201306 China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300350 China Center for Turbulence Control Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

The paper presents a systematic investigation of vortex-induced vibrations (VIV) of a D-section prism at subcritical Reynolds numbers (Re) through direct numerical simulation. To this end, we first report the critical Re values for flow over a stationary and an elastically supported D-section prism within the angle of attack α=0∘–180∘. We then focus on the VIV response and vortex dynamics across eight recognized regimes, classified based on the vibration amplitude and frequency responses, at subcritical Re. Further, the physical mechanisms for the excitation and sustenance of the VIV response are imparted, using the force partitioning method that allows for load estimation by different generation origins. It is found that the VIV response of the D-section prism can be excited and sustained by the viscous and/or pressure lift coefficient in phase with the prism velocity. Finally, we check the critical Re for the galloping onset and verify the absence of galloping in subcritical flow. The reasons behind the absence and occurrence of galloping are unraveled. It is found that galloping is excited and sustained by the motion-induced asymmetric pressure lift with a frequency identical to the dominant vibration frequency. The viscous lift is entirely low-frequency and motion-related but negative to galloping. The analysis of mode conditions indicates that galloping requires an unstable structural mode with a frequency close to the natural frequency of the prism and flow mode with the natural vortex shedding frequency. The flow mode should be sufficiently strong to guarantee galloping at infinite reduced velocity.

关键词： Vortex flow

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An Advanced control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid 5

An Advanced Control Strategy for Bidirectional Isolated Thre...

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5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Guo, Dongxin Wang, Panbao Kong, Jiansheng Tian, Jinjie Ren, Chunguang Meng, Xiangqi Jia, Yanbing Qin, Yue Wang, Zeqi Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Department of Electrical Engineering Harbin Institute ofTechnology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy. © 2021 IEEE

关键词： Pulse width modulation

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Data-Driven control of Distributed Event-Triggered Network Systems

arXiv

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arXiv 2022年

作者： Wang, Xin Sun, Jian Wang, Gang Allgöwer, Frank Chen, Jie State Key Lab of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing100081 China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120 China Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart70550 Germany Department of Control Science and Engineering Tongji University Shanghai201804 China State Key Lab of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing100081 China

The present paper deals with data-driven event-triggered control of a class of unknown discrete-time interconnected systems (a.k.a. network systems). To this end, we start by putting forth a novel distributed event-triggering transmission strategy based on periodic sampling, under which a model-based stability criterion for the closed-loop network system is derived, by leveraging a discrete-time looped-functional approach. Marrying the model-based criterion with a data-driven system representation recently developed in the literature, a purely data-driven stability criterion expressed in the form of linear matrix inequalities (LMIs) is established. Meanwhile, the data-driven stability criterion suggests a means for co-designing the event-triggering coefficient matrix and the feedback control gain matrix using only some offline collected state-input data. Finally, numerical results corroborate the efficacy of the proposed distributed data-driven ETS in cutting off data transmissions and the co-design procedure. Copyright © 2022, The Authors. All rights reserved.

关键词： Linear matrix inequalities

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