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Experimental investigation of reciprocating ferrofluid marble motion driven by repulsive and attractive magnetic forces: A scheme for mixing enhancement during transportation

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Journal of Molecular Liquids 2025年 426卷

作者： Sarkhosh, Mohammad Hossein Yousefi, Masoud Dabirzadeh, Mohammad Hassan Bijarchi, Mohamad Ali Nejat Pishkenari, Hossein Micro/Nano Robotics Laboratory Department of Mechanical Engineering Sharif University of Technology Tehran Iraq Department of Mechanical Engineering Sharif University of Technology Tehran Iraq

Liquid marbles have found extensive applications in digital microfluidics, particularly in fields such as chemistry, diagnostics, and biotechnology. In this study, we present the first investigation into the reciprocal motion of ferrofluid marbles (FMs) manipulated using both repulsive and attractive magnetic forces. These forces are modulated by varying the magnetic dipole induction within the FM. Key components in this manipulation include Helmholtz coils and a permanent magnet. In previous studies, mixing and transportation operations have been conducted in digital microfluidics sequentially and distinctly. By employing pulse-width modulation (PWM) signals to control the current in the Helmholtz coils, we achieve simultaneous mixing and transport of the FMs, which accelerates these operations for biological applications. Understanding the underlying physics is essential for the practical applications of this technique. Our findings reveal two distinct types of motion: net attraction while oscillating (NAWO) and net repulsion while oscillating (NRWO). We also examine the effects of parameters such as the PWM signal frequency, duty cycle, and Helmholtz coil current. Furthermore, we develop a regime map to distinguish between NAWO and NRWO motions. Finally, an analytical model is proposed and validated through experimental testing to describe the dynamic response of the FMs. © 2025 Elsevier B.V.

关键词： Permanent magnets

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Toward Development of Novel Remote Ultrasound Robotic System Using Soft robotics Technology

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Journal of engineering and Science in Medical Diagnostics and Therapy 2024年第2期7卷 021012页

作者： Papendorp, Sky Ovando, Ammy Gharaie, Saleh Mosadegh, Bobak Guerra-Zubiaga, David Alaie, Seyedhamidreza Ashuri, Turaj Moghadam, Amir Ali Amiri Department of Robotics and Mechatronics Engineering Kennesaw State University MariettaGA30060 United States School of Engineering Deakin University GeelongVIC3216 Australia Department of Radiology Dalio Institute of Cardiovascular Imaging Weill Cornell Medicine New YorkNY10021 United States Department of Mechanical and Aerospace Engineering New Mexico State University Las CrucesNM88003 United States Southern Polytechnic College of Engineering and Engineering Technology Kennesaw State University MariettaGA30060 United States

This paper reports on the development of a novel soft robotic system for remote ultrasound applications. Direct contact of the ultrasound probe with the patient’s body represents a safety risk and therefore control of the probe’s positioning and applied force is a crucial task. The proposed robot uses a passive control system that provides safe interaction between the robot and the patient by leveraging soft robotics technology. The soft robot’s structure can be considered as a nonlinear spring which can be designed to exert a safe force within the robot’s workspace to guarantee the safety of human–robot interaction. The literature suggests that effective ultrasound imaging of both the heart and abdomen requires six degrees-of-freedom. These degrees-of-freedom consist of three translational motions, which are achieved using a novel hybrid soft cable-driven parallel robot, and three wrist motions, which is based on a universal joint design. The experimental results show that the robot can achieve all these six degrees-of-freedom, and its blocking force can be engineered to generate a uniform force within the workspace. Copyright © 2024 by ASME.

关键词： Probes

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Bidirectional rotating direct-current triboelectric nanogenerator with self-adaptive mechanical switching for harvesting reciprocating motion

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International Journal of Extreme Manufacturing 2024年第4期6卷 324-335页

作者： Donghan Lee Joonmin Chae Sumin Cho Jong Woo Kim Awais Ahmad Mohammad Rezaul Karim Moonwoo La Sung Jea Park Dongwhi Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee University1732 Deogyeong-daeroYonginGyeonggi 17104Republic of Korea Department of Chemistry University of LahoreLahorePakistan Department of Mechanical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia School of Mechanical Engineering Korea University of Technology and Education1600 Chungjeol-roCheonanChungnam 31253Republic of Korea

Amid the growing interest in triboelectric nanogenerators(TENGs)as novel energy-harvesting devices,several studies have focused on direct current(DC)TENGs to generate a stable DC output for operating electronic ***,owing to the working mechanisms of conventional DC TENGs,generating a stable DC output from reciprocating motion remains a ***,we propose a bidirectional rotating DC TENG(BiR-TENG),which can generate DC outputs,regardless of the direction of rotation,from reciprocating *** distinct design of the BiR-TENG enables the mechanical rectification of the alternating current output into a rotational-direction-dependent DC ***,it allows the conversion of the rotational-direction-dependent DC output into a unidirectional DC output by adapting the configurations depending on the rotational *** to these tailored design strategies and subsequent optimizations,the BiR-TENG could generate an effective unidirectional DC *** of the BiR-TENG for the reciprocating motions of swinging doors and waves were demonstrated by harnessing this *** study demonstrates the potential of the BiR-TENG design strategy as an effective and versatile solution for energy harvesting from reciprocating motions,highlighting the suitability of DC outputs as an energy source for electronic devices.

关键词： direct-current triboelectric nanogenerator mechanical rectification self-adaptive mechanical design harvesting reciprocation motion

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Lumbar spine localisation method based on feature fusion

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 931-945页

作者： Yonghong Zhang Ning Hu Zhuofu Li Xuquan Ji Shanshan Liu Youyang Sha Xiongkang Song Jian Zhang Lei Hu Weishi Li Robotics Institute School of Mechanical Engineering and AutomationBeihang UniversityBeijingChina Beijing Zhuzheng Robot Co. LTDBeijingChina Department of Mechanical Aerospace and Biomedical EngineeringUniversity of TennesseeKnoxvilleTennesseeUSA Department of Orthopaedics Peking University Third HospitalBeijingChina Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijingChina Beijing Key Laboratory of Spinal Disease Research BeijingChina School of Biological Science and Medical Engineering Beihang UniversityBeijingChina Department of Computer Science University of WarwickCoventryUK

To eliminate unnecessary background information,such as soft tissues in original CT images and the adverse impact of the similarity of adjacent spines on lumbar image segmentation and surgical path planning,a two‐stage approach for localising lumbar segments is ***,based on the multi‐scale feature fusion technology,a non‐linear regression method is used to achieve accurate localisation of the overall spatial region of the lumbar spine,effectively eliminating useless background information,such as soft *** the second stage,we directly realised the precise positioning of each segment in the lumbar spine space region based on the non‐linear regression method,thus effectively eliminating the interference caused by the adjacent *** 3D Intersection over Union(3D_IOU)is used as the main evaluation indicator for the positioning *** an open dataset,3D_IOU values of 0.8339�0.0990 and 0.8559�0.0332 in the first and second stages,respectively is *** addition,the average time required for the proposed method in the two stages is 0.3274 and 0.2105 s ***,the proposed method performs very well in terms of both pre-cision and speed and can effectively improve the accuracy of lumbar image segmentation and the effect of surgical path planning.

关键词： CT image lumbar spatial orientation multi‐scale information fusion

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Regional Framework Towards Establishing Treatment, Storage, and Disposal (TSD) Facilities for PV Waste Management in the Philippines: A Case Study of Laguna Province

Regional Framework Towards Establishing Treatment, Storage, ...

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2024 Symposium on Insight to Foresight via Geospatial Technologies

作者： Diccion, Antonio L. Duran, Jeffrey Z. Engineering Program School of Advanced Studies Saint Louis University Baguio City2600 Philippines Mechanical and Mechatronics Engineering Department School of Engineering and Architecture Saint Louis University Baguio City2600 Philippines

The accelerated adoption of photovoltaic (PV) systems for renewable power generation in the Philippines will yield a tremendous amount of PV waste. However, the country lacks a comprehensive framework for understanding PV module waste volume growth and optimally siting Treatment, Storage, and Disposal (TSD) facilities for PV waste management based on minimum siting factor. The study aims to develop a regional framework that utilizes a geographic information system (GIS)-based approach to find the potential sites and optimal locations of TSD facilities in Laguna, Philippines, based on the estimated PV module waste growth of solar energy systems with service contracts and minimum siting criteria under department of Environment and Natural Resources (DENR) Administrative Order 2013-22. By 2060, the projected amount of PV module waste in Laguna province will be around 162,230 metric tons based on the waste projection results. The suitable sites cover around 19,720.5 hectares or 11.21% of the total land area of Laguna, which were determined by various siting factors that encompass social, economic, and environmental factors and obtained using binary suitability analysis and vector overlay analysis. The optimal locations of the two TSD facilities were identified using strategic positioning based on hotspot analysis, clustering algorithm, and proximity analysis. Consequently, the distance and GHG emissions of the two optimal locations were calculated. Indeed, the approach will serve as a guide for policymakers and other stakeholders in understanding PV module waste growth and strategically and optimally position TSD facilities on suitable sites for efficient and effective PV waste management. © Author(s) 2024.

关键词： Waste treatment

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IoT Based Smart Betta Fish Monitoring system with fish fatality prediction. 8

IoT Based Smart Betta Fish Monitoring system with fish fatal...

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8th International Conference for Man Machine Systems, ICoMMS 2023

作者： Julida, N.L. Othman, S.M. Ayob, M.N. Rahim, N. Abdul Kanafiah, S.N.A.M. Azmi, M.S. Muhamad Hashim, M.S. Mohamad Talib, M.T.M. Khalid, N.S. Centre of Intelligence for Intelligent Robotics and Autonomous Systems University Malaysia Perlis Malaysia Mechanical Department Faculty of Mechanical Engineering and Technology Universiti Malaysia Perlis Malaysia

This study enlightens the importance of rearing water quality to Betta fish health. A water quality monitoring system was developed based on water quality parameters namely water pH, temperature (°C) and TDS level (ppm). Fuzzy Logic Algorithm was applied to predict the possibility of the fish to get infected by the disease using combination of the water quality parameters value. Graphical User Interface (GUI) was developed to test the efficiency of the fish disease prediction system using fuzzy logic algorithm before the fuzzy rule been embedded to the IOT system. Arduino Uno Wi-Fi R2.0 and Blynk Apps used for enabling the system to update the aquarium water quality to owner in real-time. Hydroponic technology implemented in this project for recirculate rearing water inside the fish tank. Theoretically, the aquaponic system will help regulate the water tank parameters in optimum range and Betta Splendens should be free from all diseases. © Published under licence by IOP Publishing Ltd.

关键词： Fish

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Synthesis of amorphous silica from rice husk ash using the sol–gel method: Effect of alkaline and alkaline concentration

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Materials Today: Proceedings 2023年 87卷 225-229页

作者： Aprilia S. Rosnelly C.M. Zuhra Fitriani F. Haffiz Akbar E. Raqib M. Rahmah K. Amin A. Baity R.A. Department of Chemical Engineering Engineering Faculty Universitas Syiah Kuala Banda Aceh 23111 Indonesia Doctoral Program School of Engineering Post Graduate Program Universitas Syiah Kuala Banda Aceh 23111 Indonesia Mechanical Engineering Department Engineering Faculty University of Abulyatama Lampoh Keude-Aceh Besar Indonesia

In this study, silica extraction from RHA (rice husk ash) has been successfully performed by alkaline using KOH and NaOH with sol–gel precipitation. The silica gel was characterized for the functional group by FTIR, crystallinity with XRD, structure silica with SEM and particle size with PSA. The results show the higher concentration of solvent led to higher silica. The FTIR analysis revealed vibrations of Si[sbnd]O and Si[sbnd]O[sbnd]Si on the product. Additionally, observed to be amorphous and aggregated, the silica extracted from RHA also exhibited a decrease in all samples. © 2023

关键词： Alkaline extraction Concentration of solvent Potassium hydroxide Rice husk ash Silica Sodium hydroxide

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A Real-time Affordance-based Object Pose Estimation Approach for Robotic Grasp Pose Estimation

A Real-time Affordance-based Object Pose Estimation Approach...

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2023 International Conference on System Science and engineering, ICSSE 2023

作者： Wong, Shang-Wen Chiu, Yu-Chen Tsai, Chi-Yi Tamkang University Doctoral Program in Robotics College of Engineering New Taipei City Taiwan Tamkang University Department of Electrical and Computer Engineering New Taipei City Taiwan

ISBN: (纸本)9798350322941

This paper proposes a pose estimation system for robot grasping based on a novel Object Affordance Detection and Segmentation (OADS) network. The proposed system consists of four modules: (1) OADS network;(2) point cloud extraction;(3) object pose estimation;(4) grasp pose estimation. Based on the OADS network, the proposed system achieves affordance-based object pose estimation results. The proposed grasp pose estimation system is evaluated on a laboratory-made dual-arm robot. Experimental results show that the proposed system achieves high detection rate and high accuracy in affordance detection and segmentation tasks, leading to a high success rate in object grasping tasks with lab-made dual-arm robot. © 2023 IEEE.

关键词： Object detection

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Thermoeconomic and thermoenvironmental analysis of the chilled water system in a shopping mall

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INTERNATIONAL JOURNAL OF REFRIGERATION 2022年 134卷 304-311页

作者： Abreu, Renata Portela Correia, Victor Hugo Lobo Lourenco, Atilio Barbosa Marques, Adriano da Silva Carvalho, Monica [a]Graduate Program of Mechanical Engineering Federal University of Paraíba João Pessoa Brazil [b]Department of Mechanical Engineering Federal University of Espírito Santo Vitória Brazil [c]Department of Mechanical Engineering Federal Rural University of Pernambuco Cabo de Santo Agostinho Brazil [d]Department of Renewable Energy Engineering Federal University of Paraíba João Pessoa Brazil

This is the first study to apply a combination of two thermoeconomic approaches (UFS and H & S) with Life Cycle Assessment (LCA) to a chilled water system installed in a shopping mall. The objective is to obtain monetary and environmental costs for the thermal energy stored by developing both thermoeconomic and thermoenvir-onmental assessments. The thermoeconomic study determined internal flows, defined inputs and products, and described the productive structure to obtain exergy and monetary costs. The LCA methodology quantified the greenhouse gas emissions associated with equipment operation and energy flows. The results indicated efficient thermoeconomic behavior for the heat exchangers. The monetary and environmental costs of chilled water are, respectively, US$ 0.2267/MJ and 0.8186 kg CO2-eq/MJ.

关键词： UFS model H&S model Life Cycle Assessment Greenhouse gases Refrigeration Cooling

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Development of Auxiliary SCADA System for Wind Farm Operation Based on Open Platform Communication

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Journal of the Chinese Society of mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2022年第1期43卷 21-27页

作者： Liu, Jui-Hung Padrigalan, Kathleen Lee, Rong-Mao Department of Mechanical Engineering Southern Taiwan University of Science and Technology Tainan710301 Taiwan Department of Intelligent Robotics National Pingtung University Pingtung900391 Taiwan

The remote supervisory control and data acquisition (SCADA) system is necessary for the wind turbine (WT) operation and the management of a wind farm. Technicians can resolve minor WT failures remotely and prepare equipment and spare parts for an on-site maintenance in advance with the aid of the SCADA system. This work is a case study, malfunction of the SCADA system for a wind farm in middle-Taiwan was encountered but the maintenance of WT manufacturer was no longer available due to the company bankruptcy. Since the emerged SCADA system failure is mainly caused by the storage and access of database, an auxiliary SCADA system based on the open platform communication (OPC) was designed to recover the SCADA system function. The OPC-based SCADA system is capable of retrieving data and reconstructing data structure from the WT controller directly. The rebuilt database has been employed in a front-tier web-based interface to regenerate the monitoring function for this wind farm. © 2022, Chinese mechanical engineering Society. All right reserved.

关键词： Wind turbines

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