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15th Biomedical engineering International Conference, BMEiCON 2023

作者： Suwannaphan, T. Tharasanit, T. Wongpakham, T. Pimpin, A. Chessadangkul, K. King Mongkut's University of Technology North Bangkok Department of Mechanical Engineering Technology Bangkok Thailand Faculty of Veterinary Science Chulalongkorn University Department of Obstetrics Gynaecology and Reproduction Bangkok Thailand Chulalongkorn University Faculty of Engineering Department of Mechanical Engineering Bangkok Thailand Chulalongkorn University Biomedical Engineering Program Faculty of Engineering Bangkok Thailand

ISBN: (纸本)9798350345247

Selection of bioreactor system depends on many factors such as type of products, process of culture, and product density. No standard for development methodology is available nowadays. This work demonstrated the development of multi mini-chamber indirect perfusion bioreactor to support 3-D cell culture. The systems consisted of scaffolds, cell/scaffold retainers, culture tanks with a single peristaltic pump. Flow simulation was conducted to investigate the effects of flow rate and inlets/outlets' position on the distribution of shear stresses on the cell/scaffold cassettes installed inside the bioreactor. The prototype with 4 culture tanks connected in series was tested for long period operation. Lastly, preliminary experiments to culture and differentiate pig muscle stem cells were conducted. The results showed that muscle cells were successfully differentiated both on glass slides and aloe vera scaffolds inside the developed bioreactor. © 2023 IEEE.

关键词： Flow simulation

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Microparticle orientation and pattern in a combined acoustic and magnetic field 26

Microparticle orientation and pattern in a combined acoustic...

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26th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2022

作者： Zhang, Zhiyuan Ahmed, Daniel Acoustic Robotics Systems Laboratory Institute of Robotics and Intelligent Systems Department of Mechanical and Process Engineering ETH Zurich Zurich Switzerland

ISBN: (纸本)9781733419048

Microparticle manipulation actuating by external fields, magnetic fields and acoustic fields, are attractive for lab-on-chip systems and microscale medical applications since they allow for the manipulation of microparticles without contact, and unaffected by object opacity. The combination of both fields could overcome the limitations encountered by single actuation methods and provide more freedoms of operations. Here we demonstrate the intentional control over the local orientation and pattern of microparticles in a bulk liquid medium, impelled by a combination of magnetic and acoustic fields. © 2022 MicroTAS 2022 - 26th International Conference on Miniaturized Systems for Chemistry and Life Sciences. All rights reserved.

关键词： Acoustic fields

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Characterization of a Meso-Scale Wearable Robot for Bathing Assistance

Characterization of a Meso-Scale Wearable Robot for Bathing ...

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2022 IEEE International Conference on robotics and Biomimetics, ROBIO 2022

作者： Liu, Fukang Patil, Vaidehi Erickson, Zackory Temel, Zeynep Mechanical Engineering Department Robotics Institute Carnegie Mellon University PittsburghPA United States

ISBN: (纸本)9781665481090

Bathing and skin care assistance are important and practical tasks when providing care to adults with phys-ical disabilities in healthcare and nursing home settings. Yet, achieving flexible and efficient cleaning tasks on the human body is challenging, since cleaning the body involves direct human-robot physical contact and simple, safe, and effective devices are needed for bathing and hygiene. In this paper, we present a meso-scale wearable robot that can locomote along the human body to assist in cleaning the surface of a limb. We evaluated the cleaning performance of the robot under different scenarios. The experiments on a cylindrical surface (approximating a limb) show that the robot can achieve cleaning surface coverage of over 95% with varying cleaning fabrics. The wearable robot also exhibited cleaning performance of 94% on a human arm and 93% on a manikin torso. © 2022 IEEE.

关键词： Cleaning

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Optimal Prescribed Performance Control for Euler-Lagrange Systems 11

Optimal Prescribed Performance Control for Euler-Lagrange Sy...

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11th IEEE International Conference on Systems and Control, ICSC 2023

作者： Malli, Ioanna Vlachos, Christos Bechlioulis, Charalampos P. Kyriakopoulos, Kostas J. School of Mechanical Engineering National Technical University of Athens Greece University of Patras Department of Electrical and Computer Engineering Greece New York University Engineering Division Center for Ai and Robotics Abu Dhabi United Arab Emirates

ISBN: (纸本)9798350304886

This work introduces an optimal control policy aiming to stabilize an Euler-Lagrange system of unknown dynamics, while simultaneously satisfying predefined response criteria. The proposed methodology unfolds in two stages. In the initial phase, a neural network is trained online via an iterative process to capture the system's dynamics. Subsequently, in the second phase, by utilizing the acquired dynamics, a successive approximation algorithm is employed to derive a nearly optimal control law while taking into consideration prescribed performance specifications such as convergence speed and steady state error. Validation of our method is achieved through a simulated paradigm, confirming the success of both the identification process and the minimization of the adopted integral cost. © 2023 IEEE.

关键词： Dynamics

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Experimental test rig for oil film thickness study 11

Experimental test rig for oil film thickness study

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Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies XI 2022

作者： Cristian, Românu Ionuţ Ioan-Cozmin, Manolache-Rusu Ilie, Muscă Gavril, Ciornei Department of Mechanics and Technologies Mechanical Engineering Automotive and Robotics Faculty "Ștefan cel Mare" University of Suceava 13 University Street 720229 Romania

ISBN: (纸本)9781510660939

The paper presents some aspects regarding the conception and construction of an experimental test rig used for studies concerning friction phenomenon of threads immersed in oil, maintained in a state of motion with constant velocity. The structure of the experimental test rig, testing methodology, experimental results and the applicability of the experimental set-up were detailed. To validate the experimental equipment and method, the obtained values were correlated with those obtained analytically. A good correlation was found, which attests the applicability of the test rig and method. © 2023 SPIE.

关键词： Film thickness

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Soft Robot Kinematic Control Via Manipulability-Aware Redundancy Resolution

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Journal of Mechanisms and robotics 2025年第7期17卷 071013页

作者： Azizkhani, Milad Ha, Junhyoung Gunderman, Anthony L. Chen, Yue Department of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332 Center for Healthcare Robotics Artificial Intelligence and Robotics Institute Korea Institute of Science and Technology Seoul 02792 South Korea Department of Mechanical Engineering University of Arkansas Fayetteville AR 72701 Department of Biomedical Engineering Georgia Institute of Technology Atlanta GA 30332

This article addresses the kinematic control of a redundant soft robotic arm. Full pose kinematic control of soft robots is challenging because direct application of the classical controllers developed based on rigid robots to soft robots could lead to unreliable or infeasible motions. In this study, we explore the manipulability property of a soft robotic arm and develop an advanced resolved-rate controller that prioritizes position over orientation control and switches its modes and gains based on position and orientation manipulabilities, enabling stable motion even when the robot is close to the singular configurations. The simulation and experimental results indicate that our proposed method outperforms previous methods in terms of both accuracy and smoothness during operation.

关键词： Resolution (Optics) Kinematics bio-inspired Simulation Errors Redundancy (engineering) continuum robotics Robots soft robotics Soft robots robotics kinematics Algorithms

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Wheelchair Control by Users' Eye Movements Using Signals Acquired in OpenBCI

Wheelchair Control by Users' Eye Movements Using Signals Acq...

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2023 IEEE International Symposium on Robotic and Sensors Environments, ROSE 2023

作者： Rexha, Genta Pajaziti, Arbnor Bajrami, Xhevahir Kola, Jozef Capi, Genci Pongthanisorn, Goragod Polytechnic University of Tirana Department of Electronics and Telecommunications Tirana Albania Faculty of Mechanical Engineering Department of Mechatronics Prishtina Serbia Albanian University Department of Engineering Tirana Albania Hosei University Assistive Robotics Laboratory Tokyo Japan

ISBN: (纸本)9798350308044

In this study is presented a wheelchair with a control mechanism driven by the user's eye movements. The wheelchair's functionality is enabled through two stepper motors, a driver DMA860H, and an Arduino Uno microcontroller. The objective of the research is that the EEG signals are read and by means of these signals we perform certain tasks or control various processes. OpenBCI (Brain Computer Interface) board has been used to measure and record electrical activity produced by the brain and is compatible with standard EEG (Electroencephalogram) *** user's eye movements will be used to operate the stepper motors. The OpenBCI Cyton plus Daisy biosensing board samples the signals, which are then processed in Matlab before relaying the motions to Arduino Uno. The wheelchair can move left, right, backward, and forward, based on eye movements. © 2023 IEEE.

关键词： Wheelchairs

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Removal of As(V)in the presence of Cr(VI)in contaminated water from the Bajio region of Mexico using ferrihydrite-functionalized graphene oxide(GOFH):A case study

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Emerging Contaminants 2024年第3期10卷 134-144页

作者： D.R.Joya-Cardenas J.P.Rodríguez-Caicedo M.A.Corona-Rivera N.Saldana-Robles C.E.Damian-Ascencio A.Saldana-Robles Graduate Program in Biosciences University of GuanajuatoIrapuato36500Mexico Facultad de Ingenierías y Tecnologías Instituto XeriraUniversidad de SantanderBucaramanga680003Colombia Chemical Engineering Unit Academic Multidisciplinary Region Altiplano UAMRA.Autonomous University of San Luis PotosíMatehualaSan Luis Potosí78000Mexico Department of Agricultural Engineering University of GuanajuatoIrapuato36500Mexico Department of Mechanical Engineering University of GuanajuatoSalamanca36800Mexico Mechanical Engineering Department Virginia TechBlacksburgVA24061USA

The presence of heavy metals such as arsenic(As)and chromium(Cr)can be considered one of the most toxic heavy *** study aims to develop and evaluate a graphene oxide(GO)based material functionalized with ferrihydrite for the removal of As(V)in the presence of Cr(VI).The adsorbent ferrihydrite-functionalized graphene oxide(GOFH)was characterized by SEM,FTIR,XRD,XPS,surface charge,BET and *** adsorption capacities for As(V)and Cr(VI)were 160 and 66 mg g^(-1)respectively at pH 4 and 298 K,fitting the Langmuir *** binary systems,GOFH adsorbed As(V)with an adsorption capacity of 137 mg g^(-1)in the presence of 20 mg L^(-1)Cr(VI)at room *** analysis revealed an exothermic and spontaneous ***,GOFH effectively removed several coexisting anions from groundwater,including SO_(4)^(2-),CO_(3)^(2-)and Cl^(-).This work evidences the potential of GOFH for competitive adsorption of priority pollutants from complex *** GOFH material represents a technically and economically viable technology for application in groundwater decontamination,as it requires inexpensive precursors and ambient conditions during synthesis and operation.

关键词： Competition Ions Contamination Groundwater Adsorption capacity

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Accelerated learning and co-optimization of elastocaloric effect and stress hysteresis of elastocaloric alloys

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Rare Metals 2024年第12期43卷 6606-6624页

作者： Shi-Yu He Fei Xiao Rui-Hang Hou Shun-Gui Zuo Ying Zhou Xiao-Rong Cai Zhu Li Yan-Ming Wang Aysu Catal-Isik Enrique Galindo-Nava Xue-Jun Jin State Key Lab of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai200240China Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai200240China Department of Materials Science and Engineering Graduate School of EngineeringOsaka UniversityOsaka565-0871Japan University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai200240China Department of Mechanical Engineering University College LondonTorrington PlaceLondonWC1E 7JEUK

The development of high-performance advanced elastocaloric alloys is crucial for the implementation of elastocaloric ***,we present a machine learning(ML)framework to accelerate the development of novel elastocaloric alloys with large adiabatic temperature change(ΔT_(ad))and low stress hysteresis(Δσ_(hy)).The comprehensive framework comprises database construction,feature selection,model construction,alloy design and validation,and model *** are selected according to the physical attributes they *** that may reflect the compatibility between parent and product phases,lattice distortion and the free energy in the alloy are considered in the *** them,the key features are selected by recursive feature elimination and exhaustive search *** trained models in combination with the Bayesian optimization method are exploited to achieve multi-objective *** to the results,a newly designed elastocaloric alloy shows a large adiabatic temperature change of 15.2 K and low average stress hysteresis of70.3 MPa at room temperature,which is consistent with our *** predictions of our ML model are interpreted by the Shapley additive exPlainations(SHAP)approach,which explicitly quantifies the effects of each feature in our model on the adiabatic temperature change and stress ***,we employ the Sureindependence screening and sparsifying operator(SISSO)method in conjunction with the key features to formulate explicit model.

关键词： Elastocaloric alloys Adiabatic temperature change Stress hysteresis Machine learning Multi-objective optimization

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Corrosion behavior of Mg-Zn-Zr-RE alloys under physiological environment-Impact on mechanical integrity and biocompatibility

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Journal of Magnesium and Alloys 2022年第6期10卷 1542-1572页

作者： Marwa AbdelGawad Chaudhry A.Usman Vasanth C.Shunmugasamy Ibrahim Karaman Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDoh1Qatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843United States of America Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843United States of America

Benefits of RE addition on Mg alloys strength and corrosion resistance are widely reported but their effects on biodegradability and biocompatibility are still of *** paper investigates the effect of RE additions on biodegradability of Mg-Zn alloys under simulated physiological *** this context,two commercial Mg-Zn-Zr-RE alloys,namely ZE41 and EZ33,with same RE addition but different concentrations are studied in Hank’s Balanced Salt Solution(HBSS)at 37℃and with pH of ***-loss,hydrogen evolution,real-time insitu drop test,electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization are deployed to study corrosion *** mechanical integrity of both alloys is assessed by mechanical testing post ***,in vitro biocompatibility is evaluated by indirect cytotoxicity tests using NIH3T3 *** reveal that although both alloys showed similar microstructure,size and distribution of precipitates played a significant role on its corrosion *** and open circuit potential results show stable film formation on EZ33,while ZE41 showed passive layer formation followed by its deterioration,over the analyzed time *** real-time drop test,it was shown in ZE41 alloy that both T-phase and Zr-rich precipitates acted as micro cathodes,resulting in an unstable surface *** EZ33,Zr-rich regions did not influence corrosion response,resulting in better corrosion resistance that was corroborated by post-immersion surface morphology *** higher degradation observed in ZE41 alloy resulted in higher drop in flexural and tensile strength compared to EZ33 *** addition,cytotoxicity tests on NIH3T3 cells revealed that cell viability of EZ33 increased with increasing incubation time,contrary to ZE41,owing to its lower biodegradation behavior and despite higher concentrations of *** results show that an increase in RE concentration in EZ33,relative to ZE41,had a positive effect on

关键词： Magnesium alloy Corrosion EIS mechanical integrity Cytotoxicity

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