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International Conference on High Voltage engineering and Power systems (ICHVEPS)

作者： Muhamad Apriyudi Syafputra Joko Waluyo Roni Imawan Magister Program in System Engineering Universitas Gadjah Mada Yogyakarta Indonesia Department of Mechanical and Industrial Engineering Universitas Gadjah Mada Yogyakarta Indonesia Department of Electrical Engineering Universitas Gadjah Mada Yogyakarta Indonesia

The oil refinery industry has a potential emission reduction by combining its fossil fuel with Renewable Energy usage. One alternative to reduce carbon emissions is the hybrid power system using solar panels for electricity generation. This research will observe the optimum scenario for utilizing a hybrid power system. The research subject is observed refinery facilities that will be built in Indonesia, where the electricity source used formerly comes from fossils. The monitored parameters are Cost of Energy (COE) and carbon emission. optimization involves three scenarios involving basic and hybrid configurations. The basic scenario is the initial configuration of the electricity supply with power source from the generator and PLN (national’s utility). The first scenario is a hybrid power plant utilizing the roofs of existing buildings in the refinery area. The second is a hybrid power plant with a battery to supply electricity at night, at the capacity of renewable energy (RE) of 20% and 40%. Compared to the basic scenario, scenario 1 increases COE by 0.17% and reduces carbon emission at 0.3% compared to the basic scenario. Scenario 2 with 20% and 40% of renewable energy are obtained at COE of 4.7% and 44.3%, while reducing emissions occurred at 38% and 52.7%, respectively. The scenario of a hybrid power system with a 20% renewable energy is the optimal result compared to the other scenarios.

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3D scaffolds-specific cellular mechanoresponse as a pivotal regulating factor in tissue engineering

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JMST Advances 2024年第2期6卷 121-134页

作者： Ahn, Yejin Chang, Hyewon Baek, Jieung Department of Biological Sciences Pusan National University Busan Republic of Korea Division of Mechanical and Biomedical Engineering Ewha Womans University Seoul Republic of Korea Graduate Program in System Health Science and Engineering Ewha Womans University Seoul Republic of Korea

In tissue engineering, the mechanical properties of the extracellular matrix (ECM) or scaffolds have increasingly been considered to impact therapeutic efficacy by regulating cell behaviors, including differentiation, proliferation, migration, and adhesion. However, the understanding of how cells sense, integrate, and convert the mechanical cues from the ECM cues into biochemical signals to control certain cell behaviors is still elusive, especially in 3D, which more closely mimics the natural microenvironment than 2D systems. This review highlights the key differences between 2 and 3D in the contexts of mechanoregulative cell behaviors such as cell adhesion, spreading, migration, and force transmission. Furthermore, critical designing factors that needs to be considered for the fabrication of 3D tissue engineering scaffolds is discussed: stiffness, viscoelasticity, degradability, and the immobilization of biomolecules. Although mechanotransduction in 3D is actively being studied, understanding cellular mechanotransduction in 3D and designing of mechanoregulative 3D scaffolds still presents several challenges, including varying mechanical properties depending on different tissues, dynamic mechanical environments, and integration of multimodal cues. Interdisciplinary methodologies encompassing material engineering, cell biology, and mechanical engineering would serve to mitigate these challenges and augment our understanding of mechanoregulation governing cellular behaviors, thus fostering advancements in biomedical applications in the future.

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Improvement of product strength and press formability of Al-Mg-Si alloy sheets by resistance heat treatment and artificial aging

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Keikinzoku/Journal of Japan Institute of Light Metals 2006年第6期56卷 313-316页

作者： Ishiguro, Minoru Maki, Seijiro Mori, Ken-Ichiro Doctoral Program of Mechanical and Structural System Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi-shi Aichi 441-8580 Department of Production Systems Engineering Toyohashi University of Technology Toyohashi-shi Aichi

A treatment consisting of resistance heat treatment and artificial aging was developed to improve the product strength and press formability of Al-Mg-Si alloy sheets having paint bake hardenability used for automobile body panels. In this treatment, the sheets are re-solution heat-treated by resistance heating and water quenching just before the press forming. The formed sheets are artificially aged just after the press forming to increase the product strength. In the experiment, Al-0.60%Si-0.74%Mg (A6061) alloy sheets were chosen. The solution heat treatment of the sheets was sufficiently accomplished by the rapid resistance heat treatment, and the press formability of the sheets was improved. The hardness of formed products is increased by the artificial aging and paint bake hardening. It was found that the present heat treatment is effective in improving the product strength and press formability of the Al-Mg-Si alloy sheets having the paint bake hardenability.

关键词： Aluminum alloys

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Negative Stiffness Mechanism on an Asymmetric Wave Energy Converter by Using a Weakly Nonlinear Potential Model

SSRN

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SSRN 2023年

作者： Poguluri, Sunny Kumar Kim, Dongeun Bae, Yoon Hyeok Mechanical and System Design Engineering Hongik University Seoul Korea Republic of Multidisciplinary Graduate School program for Wind Energy Jeju National University Jeju Korea Republic of

Salter’s duck, an asymmetrical wave energy converter (WEC) device, showed high efficiency in extracting energy from 2D regular waves in the past;yet, challenges remain for fluctuating wave conditions. These can potentially be addressed by adopting a negative stiffness mechanism (NSM) in WEC devices to enhance system efficiency, even in highly nonlinear and steep 3D waves. A weakly nonlinear model that incorporated a nonlinear restoring moment and NSM into the linear formulations and was applied to an asymmetric WEC using a time domain potential flow model was developed. The model was initially validated by comparing it with published experimental and numerical computational fluid dynamics results. The current results were in good agreement with the published results. It was found that the energy extraction increased in the range of 6% to 17% during the evaluation of the effectiveness of the NSM in regular waves. Under irregular wave conditions, specifically at the design wave conditions for the selected test site, the energy extraction increased by 2.4%, with annual energy production increments of approximately 0.8 MWh. The findings highlight the potential of NSM in enhancing the performance of asymmetric WEC devices, indicating more efficient energy extraction under various wave conditions. © 2023, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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A Numerical Method for Reversely Generating a Pair of Conjugated Rotor Profiles of Twin-screw Compressor from the Measured Profile Data

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Procedia CIRP 2017年 63卷 483-487页

作者： Ruei-Hung Hsu Yu-Ren Wu Zi-An Chen Bachelor's Program in Precision System Design Feng Chia University Taiwan R.O.C. Department of Mechanical Engineering National Central University Taiwan R.O.C.

Reverse engineering technique is generally practiced to reconstitute the original conjugated rotor profiles from the measured point data with profile deviation for further evaluating performance of the competitor's same-level products in the twin-screw compressor manufacturing industry. However, it is time-consuming when synthesizing and restoring the original rotor profiles via either trial or enveloping methods. This paper proposed a numerical method, named meshing clearance elimination (MCE) method, for approaching pairs of conjugated male and female rotor profiles from the discrete measured profile points. By using this method, the clearance between two screw rotors can be attained via the normal rack generation computation and then eliminated by proportionally distribute the normal compensation onto the measured rotor profiles to obtain the “ideal” rotor profiles to avoid numerical divergence in the following compressor performance computation. Two kinds of rotor profiles measured from CMM (Coordinates Measurement Machine) were demonstrated in the numerical examples to show the effectivity and advantages of the MCE method.

关键词： twin-screw compressor rotor profile meshing clearance

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Towards a soft robotic skin for autonomous tissue palpation

Towards a soft robotic skin for autonomous tissue palpation

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Federico Campisano Selim Ozel Anand Ramakrishnan Anany Dwivedi Nikolaos Gkotsis Cagdas D. Onal Pietro Valdastri Department of Mechanical Engineering Vanderbilt University Nashville TN USA Worcester Polytechnic Institute Worcester MA US Department of Mechanical Engineering and Robotics Engineering Program Worcester Polytechnic Institute Worcester MA USA Department of Robotics and Autonomous System University of Leeds Leeds UK

Manual palpation is commonly used to localize tumors and other features buried deep inside organs during open surgery. This approach is not feasible in minimally invasive or robotic surgery, as the contact with the tissue is mediated by instruments. To address this problem, we propose a soft robotic skin (SRS) that can be deployed from a small incision and create a stiffness map in a single step. Such a skin is composed of a matrix of soft robotic tactile elements (SRTEs), each one able to expand and record the tissue response during expansion. In this paper, we firstly prove the feasibility of palpation using a single SRTE. Then, we present and test a soft-suction based anchoring mechanism able to keep the SRS in the desired position in contact with the tissue, allowing surgeons to palpate different sides of the organ. Finally, we detail a calibration method for the SRTE, and assess the feasibility of identifying lumps buried inside a soft tissue phantom, and then inside a chicken liver during an ex-vivo trial. Experimental results show that the SRTE was able to differentiate simulated lumps (up to 3.25 mm deep) from healthy tissue in both the phantom and the ex-vivo trials. These results, added to the ability of the suction gripper to compensate for the expansion forces of each SRTE, are paving the way for soft robotic autonomous tools that can be used for intraoperative mapping of tissue cancers.

关键词： Surgery Rubber Soft robotics Grippers Calibration Robot sensing systems

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Soft computing algorithms for intelligent control of a mobile robot for service use

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Soft Computing 1997年第2期1卷 99-106页

作者： Tanaka, T. Ohwi, J. Litvintseva, L. V. Yamafuji, K. Ulyanov, S. V. Department of Mechanical and Control Engineering The University of Electro-Communications Chofu Tokyo 182 Japan JP Artificial Intelligence Research Centre of Program System Institute Russian Academy of Sciences Botik Pereslavl-Zallesky 152140 Russia RU

The arrangement principles and design methodology on soft computing for complex control framework of AI control system in Part 1 of this paper are developed. The basis of this methodology is computer simulation of dynamics for mechanical robotic system with the help of qualitative physics and search for possible solutions by genetic algorithms (GA). In Part 2 optimal solutions for navigation with avoidance of obstacles and technological operations as opening of door with a manipulator on GA and fuzzy neural network (FNN) are obtained and knowledge base (KB) for fuzzy controller is formed. Fuzzy qualitative simulation, GA and hierarchical node map (HN), and FNN have demonstrated their effectiveness for path planning of a mobile robot for service use. The results of fuzzy robot control simulation, monitoring, and experimental investigations are described.

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Intelligent Control of a Mobile Robot for Service Use in Office Buildings and Its Soft Computing Algorithms

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Journal of Robotics and Mechatronics 1996年第6期8卷 538-554页

作者： Tanaka, Takayuki Ohwi, Junji Litvintseva, Ludmila V. Yamafuji, Kazuo Ulyanov, Sergei V. Department of Mechanical and Control Engineering The University of Electro-Communications Chofu Tokyo182 Japan Artificial Intelligence Research Centre of Program System Institute Russian Academy of Science Botik Pereslavl-Zallesky 152140 Russia

The arrangement principles and design methodology on soft computing for complex control framework of AI control system are introduced. The basis of this methodology is computer simulation of dynamics for mechanical robotic system with the help of qualitative physics and search for possible solutions by genetic algorithms (GA). On fuzzy neural network (FNN) optimal solutions for navigation with avoidance of obstacles and technological operations as opening of door with a manipulator are obtained and knowledge base (KB) for fuzzy controller is formed. Fuzzy qualitative simulation, GA and hierarchical node map (HN), and FNN have demonstrated their effectiveness for path planning of a mobile robot for service use. New approach for direct human-robot communication with natural language and cognitive graphics is introduced. The results of fuzzy robot control simulation, monitoring, and experimental investigations are presented. © Fuji Technology Press Ltd.

关键词： Mobile robots

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Development of a framework for parallel simulators with various physics and its performance

Development of a framework for parallel simulators with vari...

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Parallel Computational Fluid Dynamics, Parallel CFD 2007

作者： Ono, Kenji Tamaki, Tsuyoshi Yoshikawa, Hiroyuki Functionality Simulation and Information Team VCAD System Research Program RIKEN 2-1 Hirosawa Wako 351-0198 Japan Division of Human Mechanical Systems and Design Faculty and Graduate School of Engineering Hokkaido University N13 W8 Kita-ku Sapporo 060-8628 Japan Fujitsu Nagano Systems Engineering 1415 Midori-cho Tsuruga Nagano 380-0813 Japan

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The impact of active learning during out-of-school time (OST) Energy Clubs on elementary school students

The impact of active learning during out-of-school time (OST...

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2010 ASEE Annual Conference and Exposition

作者： Albers, Lynn Lindsay, Karen Hemric, Janice Tucker, Jade Bottomley, Laura Hollebrands, Karen Parry, Elizabeth Mechanical and Aerospace Engineering Department North Carolina State University United States Wake County Public School System United States Washington Elementary School United States Fuller Elementary School United States College of Engineering North Carolina State University United States Department of Math Science and Technology Education North Carolina State University United States RAMP-UP program United States

Active learning during out-of-school time Energy Clubs, can positively affect students in grades 3-5 by improving their understanding of technology, what engineers do, the engineering design process, and how to improve a windmill. RAMP-UP assessed the impact through a pre- and posttest from the engineering is Elementary workbook, "Catching the Wind."[2] After completing one activity where the students built windmills out of milk cartons, there were positive improvements in their understanding of technology, what engineers do and the engineering design process ranging from 3% to 8%. Significant gains (p

关键词： Students

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