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11th IEEE Conference on Systems, Process and Control, ICSPC 2023

作者： Mamee, Tanakrit Manorost, Panason Chamroon, Chakkapong Thunsiri, Kittiya Chiang Mai University Program in Mechanical Engineering Department of Mechanical Engineering Chiang Mai Thailand Ku Leuven University Faculty of Bioscience Engineering Leuven Belgium Biomedical Engineering Institute Chiang Mai University Chiang Mai Thailand Chiang Mai University Department of Mechanical Engineering Chiang Mai Thailand Chiang Mai University Faculty of Engineering Chiang Mai Thailand

ISBN: (纸本)9798350340860

The development of compact portable ECG monitoring devices often entails the pursuit of downsizing measurement systems. This objective frequently involves additional efforts, such as custom PCB fabrication for analog front-end systems and exploration of alternative electrode types and configurations. In this study, we investigate the feasibility of using the BioAmp EXG Pill, a miniature commercial analog front-end board, in comparison to the well-established AD8232. Our analysis focuses on comparing ECG signals from five adult subjects, examining both frequency components using the welch estimation method and ECG parameters extracted from time-domain signals. The results reveal that both devices provided similar outcomes in time-domain measurements, with a slightly lower standard deviation observed in the AD8232. In terms of spectral density, both devices proficiently captured low-frequency components within the 0-3 Hz range. However, in higher-frequency domains, the AD8232 demonstrated superior capability in capturing finer frequency details. © 2023 IEEE.

关键词： Electrocardiograms

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IFWG-TOPSIS Model for Supporting Infant Failure Assessment in an Offshore Wind Turbine System

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Recent Advances in Computer Science and Communications 2022年第4期15卷 487-494页

作者： Aikhuele, Daniel O. Ighravwe, Desmond Eseoghene Babatunde, Olubayo Moses Department of Mechanical and Biomedical Engineering Bells University of Technology Ota Nigeria Department of Electrical and Electronics Engineering University of Lagos Lagos Akoka Nigeria

Introduction: System failure analysis is an essential aspect of equipment management. This analysis improves equipment reliability and availability. However, to assess infant failure under dynamic criteria, reliability engineers require special models. Methods: Hence, this study uses an Intuitionistic Fuzzy Weighted Geometric (IFWG) and Intuitionistic Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methods to develop an IFWG-TOPSIS model for infant failure assessment. We consider a case study of Offshore Wind (OFW) turbine infant failure assessment. Results: During the model evaluation, this study considered an infant failure of the turbine's main shaft, blade bearings, pitch system, jacket and monopile support structure, and gearbox. Risk factor, spare part weight, technical importance, cost, and complexity criteria were used to evaluate these components’ reliability. The results show that the blade bearings (S2) and main shaft are the most and least reliable components, respectively. To validate the model’s performance, we compared its results with Gümüş and Bali’s and standard VIKOR models results. These models selected the same components as the most and least reliable components, respectively. Thus, the proposed model is suitable for OFW turbine’s infant failure assessment. Discussion: It can be deduced that the use of the modified IFWG operator to calculate the intuition-istic fuzzy distance measure in standard TOPSIS model as the capacity to produce realistic results that can compete with existing decision-making methods. Conclusion: This study has investigated the use of techno-economic criteria for OFW turbine com-ponents’ infant failure assessment. A fuzzy-based model was used to establish the connection be-tween the criteria and the components. We developed this model using the Intuitionistic Fuzzy Weighted Geometric (IFWG) and Intuitionistic Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS)

关键词： Offshore wind turbines

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Sensor and Computer Vision-Based Wheelchair Navigation System For Detecting Obstacle And Tactile Paving

Sensor and Computer Vision-Based Wheelchair Navigation Syste...

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2024 International Conference on Computer engineering, Network and Intelligent Multimedia, CENIM 2024

作者： Al'alimah, Fathin Hanum Arifin, Achmad Hermawan, Norma Risciawan, Andra Hakim, Muhammad Lukman Rahma, Nabila Alya Institut Teknologi Sepuluh Nopember Biomedical Engineering Department Surabaya Indonesia Surabaya Indonesia Institut Teknologi Sepuluh Nopember Industrial Mechanical Engineering Department Surabaya Indonesia

ISBN: (纸本)9798350368802

Visual impairment has a significant impact, especially when accompanied by mobility impairment, resulting in loss of independent mobility. Many individuals with visual impairment rely on a white cane to navigate through tactile paving and to predict obstacles in their surroundings. However, using a white cane as a navigation aid for individuals with visual impairments who also use a wheelchair for mobility requires considerable effort to maneuver the wheelchair while holding the white cane. This study presents a wheelchair navigation system based on sensors and computer vision, equipped with obstacle and tactile path detection. The trained TensorFlow model achieved a total accuracy of 94.86% based on mAP50. The designed system demonstrates significant performance improvement with a completion time of 44.65 seconds, which is close to the normal condition time of 42.38 seconds. The NASA-TLX assessment demonstrates that the designed system can reduce the workload of using a wheelchair for visually impaired people than using a white cane. © 2024 IEEE.

关键词： Wheelchairs

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Peridynamics Investigation of the Compressive Behavior of Additively Manufactured Porous Titanium Structures

Peridynamics Investigation of the Compressive Behavior of Ad...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Gonuleri, Riza Kaan Czabaj, Michael W. Cohen, David J. Boyan, Barbara D. Schwartz, Zvi Guven, Ibrahim Department of Mechanical and Nuclear Engineering Virginia Commonwealth University RichmondVA23284 United States Department of Mechanical Engineering University of Utah Salt Lake CityUT84112 United States Department of Biomedical Engineering Virginia Commonwealth University RichmondVA23284 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

This study explores the mechanical behavior of additively manufactured titanium alloy structures under compression. Microcomputed tomography data of additively manufactured Ti6Al4V porous structures were used to create a voxel grid, enabling detailed computational analysis. Solid and two distinct porous designs were additively manufactured. The two porous designs had different strut thickness and material infill parameters. Uniaxial compressive tests provided load-displacement responses and video footage of the deformation and failure behaviors of the samples. The load-displacement responses of the porous structures are highly nonlinear. The peridynamic simulations also showed nonlinear load-displacement behavior within the same range. Multiple similarities and differences between the experiments and peridynamic-predicted deformation and failure are discussed. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Titanium alloys

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Strengthening mechanism and forming control of linear friction welded GH4169 alloy joints

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Chinese Journal of Aeronautics 2024年第4期37卷 609-626页

作者： Yu SU Xiawei YANG Tingxi MENG Xinyuan HE Dong WU Wenya LI Shuo YIN State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Friction Welding Technologies School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Mechanical Manufacturing and Biomedical EngineeringParsons BuildingTrinity College DublinThe University of DublinDublin 2Ireland

Numerical simulation and experimental research on Linear Friction Welding(LFW) for GH4169 superalloy were carried out. Based on the joint microstructure and mechanical properties,a suitable welding process was determined, which provided an important theoretical basis for the manufacture and repair of aeroengine components such as the superalloy blisk. The results show that the joint strain rate gradually increases with the increase of welding frequency, and the deformation resistance of the thermoplastic metal increases in the welding process, resulting in the interface thermoplastic metal not being extruded in time to form a flash, so the joint shortening amount gradually decreases. The thermoplastic metal in the center of the welding surface is kept at high welding temperature for a long time, resulting in the decrease of the joint strength. The microhardness of the joint shows a “W” distribution perpendicular to the weld, and most of the joints break in the Thermo-mechanically Affected Zone(TMAZ) with high tensile strength and low *** the welding area is increased without changing the aspect ratio of the welding surface, the interface peak temperature increases gradually, and the joint shortening amount decreases with the increase of the welding interface size.

关键词： Linear Friction Welding(LFW) Microstructure mechanical properties Numerical simulation Joint shortening amount

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MXene-derived TiO_(2)nanosheets/rGO heterostructures for superior sodium-ion storage

ChemPhysMater

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ChemPhysMater 2025年第1期4卷 48-55页

作者： Baosong Li Dezhuang Ji Abdallah Kamal Hamouda Shaohong Luo Department of Aerospace Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788UAE Department of Mechanical and Nuclear Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788UAE Department of Biomedical Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788UAE

Transition metal oxides hold promise as electrode materials for energy-storage devices such as batteries and ***,achieving ideal electrode materials with high capacity,long-term cycling stability,and superb rate capability remains a *** this study,we present a self-assembled heterogeneous structure consisting of TiO_(2)nanosheets derived from Ti_(3)C_(2)T_(x)MXene and reduced graphene *** structure facilitates the formation of heterogeneous structures while establishing a conductive *** restacking of porous TiO_(2)nanosheets and reduced graphene oxide within the heterostructure results in high porosity and excellent *** to enhanced electron and Na^(+)transfer,as well as improved structural stability during the Na^(+)insertion/extraction process,this heterogeneous structure exhibited exceptional Na^(+)storage ***,it exhibits a long-term cycling stability(217 mAh g^(−1)at 10 C,5000 cycles)and an ultrahigh rate capability(135 mAh g^(-1),40 C).Analysis of electrode reaction kinetics suggests that Na^(+)storage in the heterostructure is predominantly governed by a surface-controlled *** results provide a promising strategy for utilizing self-assembled heterostructures in advanced energy storage applications.

关键词： Ti_(3)C_(2)T_(x)MXene Titanium dioxide Self-assembly Heterostructure Sodium-ion batteries

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Subject-Specific Pre-Processing Pipeline for EEG Artifact Removal Aimed at Enhancing SSVEP Detection 3

Subject-Specific Pre-Processing Pipeline for EEG Artifact Re...

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3rd International Congress of biomedical engineering and Bioengineering, CIIBBI 2024

作者： Ruiz-Olaya, Andres F. Beltran, Emma V. Pulido, Edith Antonio Nariño University Faculty of Mechanical Electronics and Biomedical Engineering Bogota Colombia Universidad El Bosque Bioenginering Program Bogota Colombia

ISBN: (纸本)9798331532352

Steady-State Visually Evoked Potentials (SSVEP) based Brain-Computer Interfaces (BCIs) offer significant potential in assistive and rehabilitation technologies. However, the performance of SSVEP detection is often compromised by artifacts in Electroencephalography (EEG) signals and inter-subject variability, among other factors. This study introduces a subject-specific p reprocessing p ipeline a imed a t enhancing SSVEP signal detection accuracy. The proposed method involves a dual-stage approach, utilizing EEG signals recorded both during a baseline rest state and during tasks known to induce artifacts. By establishing a personalized reference for each subject, the pipeline enables more accurate artifact detection and removal. The pipeline's efficacy w as e valuated u sing Canonical Correlation Analysis (CCA) on an open EEG dataset, with performance assessed across varying time segments (1, 2, 3 y 4 s). Detection accuracy was calculated to quantify performance in SSVEP detection. The performance of the proposed method for the 4-second time segment was superior (96.44%) compared to the standard method (93.78%). The results demonstrate the pipeline's potential to improve the reliability of SSVEP-based BCIs, particularly in highly contaminated signals. © 2024 IEEE.

关键词： Brain

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Experimental Study of Ambient Dusts and Installment Orientations Effects on Solar Panel Efficiency 53

Experimental Study of Ambient Dusts and Installment Orientat...

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53rd American Solar Energy Society National Solar Conference 2024: Connecting Technology and Policy, SOLAR 2024

作者： Si, Xiuhua Jin, Annabelle Dai, James Xi, Jinxiang Department of Aerospace Industrial and Mechanical Engineering California Baptist University RiversideCA United States Department of Biomedical Engineering University of Massachusetts LowellMA United States

ISBN: (纸本)9798331309084

Most solar panels are stationary without cleaning systems. However, solar panels' power-generating efficiency can be significantly impacted by sunlight intensity and dusts. To remedy this, one method is to maximize the panel's light-catching ability and the other is to keep the panel clean. We systematically studied solar panel efficiency with a panel aligned in different directions relative to the sunlight. We also investigated the dusts' effects by measuring the power output under controlled dust coverages. The results showed that solar panel efficiency can increase by 40% if the panel can follow the sun. Dust deposition can reduce efficiency by 75%. Information on ambient dust concentrations was collected at different locations in southern California, including a house roof, an agriculture field, a highway side, and a cattle ranch. The correlation between the solar panel efficiency and dust coverage was developed to estimate the solar farm performance under various dust coverages. © 2024 SOLAR. All Rights Reserved.

关键词： Dust

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Heterojunction and co-catalyst engineering of bismuth vanadate by nickel molybdenum oxide and carbon quantum dot decorations for photoelectrochemical water splitting

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International Journal of Hydrogen Energy 2024年 51卷 1099-1108页

作者： Kuo, Tsung-Rong Chiou, Yu-Tai Huang, Hsiao-Wen Kongvarhodom, Chutima Saukani, Muhammad Yougbaré, Sibidou Chen, Hung-Ming Lin, Lu-Yin Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan Department of Chemical Engineering King Mongkut's University of Technology Thonburi 126 Pracha-u-thit Toong-kru Bangkok10140 Thailand Department of Mechanical Engineering Faculty of Engineering Universitas Islam Kalimantan MAB Jl. Adhyaksa No. 2 Banjarmasin70124 Indonesia /Nanoro 03 B.P 7192 Ouagadougou03 Burkina Faso Gingen technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei11054 Taiwan

Improving the charge diffusion length and water oxidation kinetics of bismuth vanadate (BiVO4) is essential to achieve better photoelectrochemical catalytic ability for water oxidation. Establishing heterojunctions and incorporating co-catalysts with BiVO4 create facile charge transfer paths and generate more water oxidation reactions. In this work, nickel molybdenum oxide (NM) and carbon quantum dot (CQD) are firstly deposited on BiVO4 by hydrothermal and soaking processes to design an efficient co-catalyst/photocatalyst system for water oxidation. The depositing amount of CQD is optimized to balance contributions of CQD and NM as the hole sink and the light-to-electron generator, respectively. The highest photocurrent densities of 2.2 and 3.9 mA/cm2 are achieved for BiVO4/NM/CQD in the electrolyte without and with hole scavenger, respectively. The BiVO4 electrode only shows a photocurrent density of 1.2 mA/cm2 in the electrolyte without hole scavenger. The best photoelectrochemical catalytic ability of BiVO4/NM/CQD is approached by the reduced charge-transfer resistance and charge recombination as well as the enhancement on carrier densities. The excellent long-term stability with the photocurrent retention of 90% under illumination for 24 h is also obtained for BiVO4/NM/CQD. This study opens a blueprint on designing efficient catalysts for water oxidation by incorporating heterojunction and co-catalyst materials simultaneously. © 2023 Hydrogen Energy Publications LLC

关键词： Heterojunctions

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Flexibility analysis methodology for pipeline networks under occasional loads

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Natural Hazards Research 2023年第1期3卷 97-124页

作者： Zahid, Umer Department of Mechanical and Aerospace Engineering Politecnico di Torino Torino 10129 Italy School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong 2522 NSW Australia

Consideration of occasional loads attributed to events like wind and earthquakes serves as a major design practice in the pipeline engineering field. Numerous methods and approaches previously developed model or categorize such loads as either quasi-static or dynamic. This paper focuses on the provision of a systematic methodology for pipeline flexibility analysis under the presence of wind and earthquake loads. Emphasis is laid on outlining the scheme for insertion of necessary rest supports and guide restraints to withstand the occasional load effects. A novel analytical formulation was first developed, yielding an optimum range of span distance between adjacent rest supports. This derivation examined the underlying contributions from all persisting loading conditions, i.e., weight, pressure, temperature, wind, and earthquake. The computed span range was then verified through a sensitivity analysis study utilizing CAESAR II software simulation. A second sensitivity analysis was further numerically performed to determine the optimal layout of guide restraints. The resulting support-restraint configuration was then comprehensively assessed based on the allowable pipeline displacements, stresses, reaction loads and nozzle forces. These permissible limits were referenced from the design recommendations of ASME B31.4 code and other standard industrial practices. The proposed approach and analytical framework can be readily adapted for any linear pipeline system under seismic and wind loads influence. Moreover, the presented flexibility evaluation technique can serve to further elucidate and expedite the pipeline analysis activity. © 2023 National Institute of Natural Hazards, Ministry of Emergency Management of China

关键词： ASME B31.4 CAESAR II Flexibility analysis Guide restraints Occasional loads Pipeline system Rest supports

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