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3rd International Conference on Trends in Electronics and Informatics, ICOEI 2019

作者： Babu, Akshay Dhonthi Ramesh Kotturshettar, B.B. Giriyapur, Arunkumar C. Automation and Robotics Department KLE Technological Uinversity Hubli India School of Mechanical Engineering KLE Technological University Hubli India Automation and Robotics KLE Technological University Hubli India

ISBN: (纸本)9781538694398

Legged motion has significant advantages over traditional locomotion techniques. Research and development on it have been constantly improving over the last couple of decades. Though there are numerous techniques in developing legged biped motion, none of them is fully satisfactory. The main aspects of legged motion are active balancing, smooth pattern generation and control. These play an important role in legged motion and there are numerous techniques developed to achieve it. The research that is shown in this project is to implement model-based design methodology in developing ZMP stability algorithm. The main area that is been concentrated in the implementation of hardware-in-loop (HIL) simulation using an xPC - target computer. The robot walking gait is generated by developing a Simulink plant model where the joint angles are tested on a virtual simulation platform. © 2019 IEEE.

关键词： Simulink

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Molecular engineering of Azobenzene-Based Anolytes Towards High-Capacity Aqueous Redox Flow Batteries

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Advanced Materials 2020年第49期132卷 22347-22354页

作者： Zu, Xihong Zhang, Leyuan Qian, Yumin Zhang, Changkun Yu, Guihua Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States School of Chemical Engineering and Light Industry Guangdong University of Technology Guangdong Guangzhou510006 China

Aqueous redox flow batteries (RFBs) are promising alternatives for large-scale energy storage. However, new organic redox-active molecules with good chemical stability and high solubility are still desired for high-performance aqueous RFBs due to their low crossover capability and high abundance. We report azobenzene-based molecules with hydrophilic groups as new active materials for aqueous RFBs by utilizing the reversible redox activity of azo groups. By rationally tailoring the molecular structure of azobenzene, the solubility is favorably improved from near zero to 2 M due to the highly charged asymmetric structure formed in alkaline environment. DFT simulations suggest that the concentrated solution stability can be enhanced by adding hydrotropic agent to form intermolecular hydrogen bonds. The demonstrated RFB exhibits long cycling stability with a capacity retention of 99.95% per cycle over 500 cycles. It presents a viable chemical design route towards advanced aqueous RFBs. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Hydrogen bonds

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Electromagnetic textile absorber applied to 4G and 5G bands

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Scientific reports 2025年第1期15卷 18768页

作者： Paulo H B Carvalho Ewaldo E C Santana Allan K D Barros Filho Paulo F Silva Júnior Keyll C R Martins Talita C Azevedo Waldemir P Martins Mauro A Medeiros Rubens S Gonçalves Lourival M Sousa Filho Gricirene S Correia Gabrielle M Fernandes Talita C Pinheiro Brenda A S Rodrigues Carlos A M Cruz Graduate Program in Electrical Engineering Federal University of Maranhão (UFMA) São Luís MA Brazil. phenrique@ifma.edu.br. Graduate Program in Electrical Engineering Federal University of Maranhão (UFMA) São Luís MA Brazil. Graduate Program in Computer and Systems Engineering Maranhão State University (UEMA) São Luís MA Brazil. Graduate Program in Mechanical Engineering Federal Institute of Maranhão (IFMA) São Luís MA Brazil. Department of Electrical Engineering Federal Institute of Paraíba (IFPB) João Pessoa PB Brazil. Graduate Program in Electrical Engineering Federal University of Amazonas (UFAM) Manaus AM Brazil. Department of Electronics and Computation Federal University of Amazonas (UFAM) Manaus AM Brazil.

Absorber materials are developed to reduce electromagnetic radiation and ensure the compatibility of the operation of electronic equipment in environments subject to interference. This work presents the development of a low-cost textile electromagnetic absorber for 4G and 5G technologies, operating at frequencies of 2.5 GHz and 3.5 GHz. The proposed electromagnetic absorber utilizes a 1 mm-thick Denim substrate, with a graphite composite used in the agricultural and commercial polyvinyl acetate glue industry, with the relationship of 25 wt%. The measurements were carried out in a Vector Network Analyzer, model E5071C Agilent Technologies, with the characterization of the Denim substrate, the glue, and the identification of the best parameters for the construction of the absorber. In the project, three low-cost textile absorbers prototypes were fabricated, with G1 = 0.25 mm, G2 = 0.35 mm, and G3 = 0.5 mm of thickness layers of the composite deposited on a Denim fabric. The results indicate that the absorber prototypes G2 presents great results in the frequency range of 4G and 5G band, with a maximum absorption of 26.6 dB in 3.94 GHz, with a structure 98.83% thinner than the commercial absorber LF-75. The variation in absorption performance may be attributed to the different mechanisms by which the absorbers operate: the commercial absorber LF-75 primarily interacts with the magnetic field, whereas the textile prototype predominantly affects the electric field.

关键词： 4G and 5G bands Electromagnetic Low-cost Textile absorber

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Hybrid electric vehicles: A review of performance in various temperature conditions

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AIP Conference Proceedings 2023年第1期2671卷

作者： Basirun Basirun Herminarto Sofyan Zainal Arifin Farid Mutohhari Rabiman Rabiman 1Postgraduate Program of Technology and Vocational Education Universitas Negeri Yogyakarta Indonesia 2Department of Automotive Engineering Education Universitas Negeri Yogyakarta Indonesia 3Department of Mechanical Engineering Education Universitas Sarjanawiyata Tamansiswa Indonesia

Air pollution and scarcity of fuel oil are the result of the high consumption rate of conventional motorized vehicles. Innovation of science and technology is needed in overcoming this pollution. Transitioning the use of vehicles, especially conventional oil-fueled cars to hybrid electric cars, is a innovation to overcome this. An important aspect of hybrid engine performance is related to changes in temperature variations that occur. Writing the article aims to examine the performance of hybrid cars in various temperature variations. Temperature varieties influence the current, voltage, and SOC of the battery which influences the motor progress (on/off). The impact of temperature is dissected to restrict the working scope of the vehicle to accomplish eco-friendly execution alongside longer battery life. The mistake between the normal and determined SOC esteems is tiny and accordingly gives the genuine mileage esteem. At lower temperatures, the mileage is lower and at higher temperatures it is high contrasted with the room temperature esteems, along these lines checking the hypothesis of the impact of temperature on the response pace of the battery cells.

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Deep reinforcement learning with linear quadratic regulator regions

arXiv

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arXiv 2020年

作者： Fernandez, Gabriel I. Togashi, Colin Hong, Dennis W. Yang, Lin F. Robotics & Mechanisms Laboratory Mechanical & Aerospace Engineering Department University of California Los AngelesCA United States Department of Electrical & Computer Engineering University of California Los AngelesCA United States

Practitioners often rely on compute-intensive domain randomization to ensure reinforcement learning policies trained in simulation can robustly transfer to the real world. Due to unmodeled nonlinearities in the real system, however, even such simulated policies can still fail to perform stably enough to acquire experience in real environments. In this paper we propose a novel method that guarantees a stable region of attraction for the output of a policy trained in simulation, even for highly nonlinear systems. Our core technique is to use "bias-shifted" neural networks for constructing the controller and training the network in the simulator. The modified neural networks not only capture the nonlinearities of the system but also provably preserve linearity in a certain region of the state space and thus can be tuned to resemble a linear quadratic regulator that is known to be stable for the real system. We have tested our new method by transferring simulated policies for a swing-up inverted pendulum to real systems and demonstrated its efficacy. Copyright © 2020, The Authors. All rights reserved.

关键词： Deep learning

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Finite Element Analysis of Different Artificial Hip Stem Designs Based on Fenestration under Static Loading

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Procedia Structural Integrity 2020年 27卷 101-108页

作者： Ikhsan Aditya Rio Prabowo Jung Min Sohn Joko Triyono Graduate School of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan 48513 South Korea

Permanent hip joint damage caused by calcification, aging, or accidents requires replacement using artificial hip joint replacement surgery. Among the biomaterial applications, the Total Hip Replacement (THR) method is the most successful. Many types of artificial hip joints are available in the commercial market. Various types of material and design can be selected to suit the needs of the patients. One of which is the design with fenestration type on the hip stem. In terms of materials, Titanium and stainless steel are the ones commonly used in hip joint replacement. In this paper, the effects of fenestration hip stem on mechanical behavior have been studied using the finite element analysis. Several hip designs, i.e., the hip joint without fenestration, hip joint with fenestration slot, hip joint with fenestration big loop, and hip joint with fenestration multi-loop, were considered in this study. All models were applied using Autodesk inventor model. Static structural analysis was performed using ANSYS to conclude at the best fenestration. Results showed that for Ti-6Al-4V material, design with many loop fenestration has the lowest stress than others, with the result obtained is 495.46 MPa. However, the artificial hip stem with slot fenestration has the smallest deformation with the least difference in value compared to other designs with distortion 0.54808 mm. In addition, the design that produced the higher stress von-Misses was big loop fenestration 526,28 MPa. In conclusion, it was found that all four designs indicated lesser stress values than the yield strength.

关键词： Hip stem finite element analysis Ti-6Al-4V fenestration

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Biomass to biofuel precursor: Conversion of glucose and fructose to 5-hydroxymethyfurfural by acid hydrolysis

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AIP Conference Proceedings 2022年第1期2681卷

作者： Nuttida Chanhom Prapaporn Prasertpong Nakorn Tippayawong 1Graduate Program in Energy Engineering Faculty of Engineering Chiang Mai University Chiang Mai Thailand 2Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai Thailand 3Department of Mechanical Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Pathum Thani Thailand.

Lignocellulosic biomass contains more than 60% of cellulose consisting of glucose and fructose that can be converted into synthetic fuel, called Dimethylfuran (DMF). DFM contains high energy density and research octane number, and low water solubility that is more appropriate than ethanol in terms of fuel. Production will start with the dehydration process to form 5-Hydroxymethylfural which will be converted to DMF in the following process. The purpose of this study was to evaluate the optimum conditions for the acid hydrolysis or dehydration conversion of glucose and fructose to 5-hydroxymethyfurfural. Response surface methodology and central composite design were used to facilitate the optimization of process variables. The HCI content ranged from 1.65 to 4.95% w/w, and the reaction time ranged from 30 to 40 minutes at a constant temperature of 140 °C. The results showed that the highest conversions for both glucose and fructose to HMF of 67 and 76 % could be achieved from 3.3 % w/w of HCl concentration and the reaction time of 35 min.

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Direct control of machine tools using 3D-CAD 34

Direct control of machine tools using 3D-CAD

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34th Annual Meeting of the American Society for Precision engineering, ASPE 2019

作者： Sagesaka, Koki Morimoto, Yoshitaka Hayashi, Akio Graduate Program in Mechanical Engineering Kanazawa Institute of Technology Graduate School Ohgigaoka Nonoichi Ishikawa Japan Department of Mechanical Engineering Kanazawa Institute of Technology Ohgigaoka Nonoichi Ishikawa Japan

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Leveraging the Template and Anchor Framework for Safe, Online Robotic Gait Design

Leveraging the Template and Anchor Framework for Safe, Onlin...

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IEEE International Conference on robotics and Automation (ICRA)

作者： Jinsun Liu Pengcheng Zhao Zhenyu Gan Matthew Johnson-Roberson Ram Vasudevan Robotics Institute University of Michigan Ann Arbor MI Department of Mechanical Engineering University of Michigan Ann Arbor MI Department of Naval Architecture and Marine Engineering University of Michigan Ann Arbor MI

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Online control design using a high-fidelity, full-order model for a bipedal robot can be challenging due to the size of the state space of the model. A commonly adopted solution to overcome this challenge is to approximate the fullorder model (anchor) with a simplified, reduced-order model (template), while performing control synthesis. Unfortunately it is challenging to make formal guarantees about the safety of an anchor model using a controller designed in an online fashion using a template model. To address this problem, this paper proposes a method to generate safety-preserving controllers for anchor models by performing reachability analysis on template models by relying on functions that bound the difference between the two models. This paper describes how this reachable set can be incorporated into a Model Predictive Control framework to select controllers that result in safe walking on the anchor model in an online fashion. The method is illustrated on a 5-link RABBIT model, and is shown to allow the robot to walk safely while utilizing controllers designed in an online fashion.

关键词： Legged locomotion Rabbits Safety Foot Predictive models Control systems

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Unifying femtosecond and picosecond single-pulse magnetic switching in Gd-Fe-Co

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Physical Review B 2021年第10期103卷 104422-104422页

作者： F. Jakobs T. A. Ostler C.-H. Lambert Y. Yang S. Salahuddin R. B. Wilson J. Gorchon J. Bokor U. Atxitia Dahlem Center for Complex Quantum Systems and Fachbereich Physik Freie Universität Berlin 14195 Berlin Germany Département de Physique Universitè de Liége (B5) B-4000 Liége Belgium College of Business Technology and Engineering Sheffield Hallam University Howard Street Sheffield S1 1WB United Kingdom Department of Electrical Engineering and Computer Sciences University of California Berkeley California 94720 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley California 94720 USA Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside California 92521 USA

Many questions are still open regarding the physical mechanisms behind the magnetic switching in Gd-Fe-Co alloys by single optical pulses. Phenomenological models suggest a femtosecond scale exchange relaxation between sublattice magnetization as the driving mechanism for switching. The recent observation of thermally induced switching in Gd-Fe-Co by using both several picosecond optical laser pulse as well as electric current pulses has questioned this previous understanding. This has raised the question of whether or not the same switching mechanics are acting at the femtosecond and picosecond scales. In this work, we aim at filling this gap in the understanding of the switching mechanisms behind thermal single-pulse switching. To that end, we have studied experimentally thermal single-pulse switching in Gd-Fe-Co alloys, for a wide range of system parameters, such as composition, laser power, and pulse duration. We provide a quantitative description of the switching dynamics using atomistic spin dynamics methods with excellent agreement between the model and our experiments across a wide range of parameters and timescales, ranging from femtoseconds to picoseconds. Furthermore, we find distinct element-specific damping parameters as a key ingredient for switching with long picosecond pulses and argue that switching with pulse durations as long as 15 ps is possible due to a low damping constant of Gd. Our findings can be easily extended to speed up dynamics in other contexts where ferrimagnetic Gd-Fe-Co alloys have been already demonstrated to show fast and energy-efficient processes, e.g., domain-wall motion in a track and spin-orbit torque switching in spintronics devices.

关键词： Demagnetization Magnetic interactions Magnetic order Magnetism Spin dynamics Ultrafast magnetic effects

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