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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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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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Preliminary Investigation of Spring-Based Gravity Compensation for an Upper Limb Assistive Robot

Preliminary Investigation of Spring-Based Gravity Compensati...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Jiang, Ming Wang, Yang Meng, Qizhi Kuo, Chin-Hsing Ceccarelli, Marco Sugahara, Yusuke Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan School of Mechanical Materials Mechatronic and Biomedical Eng. University of Wollongong Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Upper limb assistive robots have been widely developed due to their ability to aid user movement and reduce caregiver workload. In our previous work, we introduced a wearable end-effector-type upper limb assistive robot, WELiBot. To enhance the robot's portability and reduce the required actuation torque, this work investigates gravity compensation for WELiBot's mechanism using springs. Following the 1-DOF gravity compensation principle, springs were designed for lifting and reaching movement respectively. The effectiveness of this compensation effect was then evaluated by comparing the necessary torque at the actuating joints with and without springs. This work offers insight into gravity compensation for parallel mechanisms and contributes to the future development of WELiBot. © 2025 IEEE.

关键词： End effectors

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Financial Analysis of Cooling Systems for Environmental Conditioned Strawberry Cultivation in Semi-Closed Greenhouses in Chiang Mai, Thailand

Financial Analysis of Cooling Systems for Environmental Cond...

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2024 International Conference on Sustainable Energy: Energy Transition and Net-Zero Climate Future, ICUE 2024

作者： Thanthong, Chayanan Wongmongkol, Napassawan Chaichana, Chatchawan Wicharuck, Suwimon Chiang Mai University Program in Energy Engineering Faculty of Engineering Department of Mechanical Engineering Chiang Mai Thailand Chiang Mai University Faculty of Engineering Department of Mechanical Engineering Chiang Mai Thailand Chiang Mai University Energy Technology for Environment Research Center Faculty of Engineering Chiang Mai Thailand

ISBN: (纸本)9798331517076

Strawberry production is an important crop in the northern region of Thailand that is only available in winter. Theoretically, strawberries can be grown in plant factories that can control the climate conditions strawberries need. Generally, the cooling load from lighting accounts for almost 80% of the total heat load in the plant factory. To reduce the cost of using light energy and the heat load in plant factories, this study was conducted on cultivation methods in semi-closed greenhouses that utilize natural light during the day. Coolness is generated by solar energy during the day and stored in cooling energy storage that stored coolness is used during the night. The total cooling load for year-round strawberry cultivation in the greenhouse was about 814 GJ, consisting of the stages of strawberry floral initiation, flowering, and fruiting at 17%, 17%, and 66%, respectively. In addition, the payback period is around 14.16 - 16.29 years. © 2024 IEEE.

关键词： Investments

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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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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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Cell driven elastomeric particle packing in composite bioinks for engineering and implantation of stable 3D printed structures

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Bioactive Materials 2025年第2期44卷 411-427页

作者： Shira Landau Jennifer Kieda Ramak Khosravi Sargol Okhovatian Kaitlyn Ramsay Chuan Liu Amid Shakeri Yimu Zhao Karen Shen Orit Bar-Am Shulamit Levenberg Scott Tsai Milica Radisic University of Toronto Institute of Biomedical EngineeringTorontoONCanada University Health Network Toronto General Hospital Research InstituteTorontoONCanada University of Toronto Terrence Donnelly Centre for Cellular&Biomolecular ResearchTorontoONCanada Division of Cardiovascular and Thoracic Surgery Department of SurgeryDuke University Medical CenterDurhamNCUnited States Toronto Metropolitan University Department of MechanicalIndustrialand Mechatronics EngineeringTorontoONCanada Toronto Metropolitan University and Unity Health Toronto Institute for Biomedical EngineeringScience and Technology(iBEST)TorontoONCanada Faculty of Biomedical Engineering TechnionHaifaILIsrael University of Toronto Department of Chemical Engineering and Applied ChemistryTorontoONCanada Acceleration Consortium University of TorontoTorontoONCanada

Geometric and structural integrity often deteriorate in 3D printed cell-laden constructs over time due to cellular compaction and hydrogel *** study introduces a new approach that synergizes the advantages of cell compatibility of biological hydrogels and mechanical stability of elastomeric polymers for structure fidelity maintenance upon stereolithography and extrusion 3D *** this advance is the composite bioink,formulated by integrating elastomeric microparticles from poly(octamethylene maleate(anhydride)citrate)(POMaC)into biologically derived hydrogels(fibrin,gelatin methacryloyl(GelMA),and alginate).The composite bioink enhanced the elasticity and plasticity of the 3D printed constructs,effectively mitigating tissue compaction and *** exhibited a low shear modulus and a rapid crosslinking time,along with a high ultimate compressive strength and resistance to deformation from cellular forces and physical handling;this was attributed to packing and stress dissipation of elastomeric particles,which was confirmed via mathematical *** functional assembly and stability of human iPSC-derived cardiac tissues and primary vasculature proved the utility of the composite bioink in tissue *** vivo implantation studies revealed that constructs containing POMaC particles exhibited improved resilience against host tissue stress,enhanced angiogenesis,and infiltration of pro-reparative macrophages.

关键词： Elastomer 3D printing Cardiac Vascular Granular material Particle Bioink Polymer Droplet microfluidics

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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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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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Efficiently catalyzing photo-oxidation of water by surface engineering of bismuth vanadate with nickel molybdenum oxide coverages

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International Journal of Hydrogen Energy 2024年 51卷 613-622页

作者： Kuo, Tsung-Rong Huang, Hsiao-Wen Kongvarhodom, Chutima Saukani, Muhammad Yougbaré, Sibidou Chen, Hung-Ming Lin, Lu-Yin International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Graduate Institute of Nanomedicine and Medical 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 Ouagadougou 03 Burkina Faso Gingen Technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei11054 Taiwan

Bismuth vanadate with suitable band edges is one of the efficient photocatalysts for water oxidation. Establishing heterojunction can improve electron diffusion lengths and photocatalytic ability of BiVO4. In this work, nickel molybdenum oxide (Ni–Mo–O) and BiVO4 heterojunction is established by the hydrothermal process with different nickel to molybdenum precursor ratios. The Ni–Mo–O/BiVO4 electrode is applied as photoanodes for water oxidation. The growth mechanism of Ni–Mo–O on BiVO4 surface is proposed. The Ni–Mo–O deposition amount is optimized regarding to light absorbance and charger transportation. The largest photocurrent density of 1.72 mA/cm2 at 1.23 VRHE is obtained for the optimal NiMoO4/BiVO4 electrode (NM12) in the electrolyte without hole scavenger, while the pure BiVO4 electrode only shows a photocurrent density of 0.90 mA/cm2. The NM12 electrode even presented an impressive photocurrent density of 5.39 mA/cm2 at 1.23 VRHE in the electrolyte with the hole scavenger, owing to the abundant active sites and higher light absorbance as well as the favorable synergistic effects from its suitable Ni to Mo ratio. The NM12 electrode also shows excellent long-term stability with the photocurrent retention of 83% after illumination for 6500 s. This work opens a blueprint for establishing a novel heterojunction with the adjustable metal ratio and coverage on BiVO4. © 2023 Hydrogen Energy Publications LLC

关键词： Heterojunctions

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