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3rd IASTED International Conference on Medical engineering 2005

作者： Miyata, Shogo Furukawa, Katsuko Ushida, Takashi Tateishi, Tetsuya Department of Mechanical Engineering Graduate School of Engineering University of Tokyo Hongo 7-3-1 Bunkyo Tokyo Japan Graduate School of Medicine University of Tokyo Tokyo Japan Biomaterial Center National Institute for Material Science Japan

ISBN: (纸本)0889864780

Recently, an approach to restore cartilage defects, culturing autologous chondrocytes to create a three dimensional tissue, has been developed. In this kind of approach, it is important to study whether the extracellular matrices synthesized by cultured chondrocytes have dynamic mechanical properties unique to articular cartilage. In this study, we evaluated in detail dynamic visco-elastic properties of chondrocyte/agarose constructs in compression and shear directions, and compared those properties with biochemical composition. As the results, the dynamic modulus of the constructs increased over the culture time. Furthermore, a regression analysis showed that the sulfated glycosaminoglycan (sGAG) content is correlated strongly with dynamic stiffness in both compression and shear deformation. On the other hand, loss tangent, which represents an energy dissipation capability of the constructs, showed little correlation with sGAG content.

关键词： Cartilage

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Coupled quantum - Scattering modeling of thermoelectric properties of Si/Ge/Si quantum well superlattice

Coupled quantum - Scattering modeling of thermoelectric prop...

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2006 ASME International mechanical engineering Congress and Exposition, IMECE2006

作者： Bulusu, A. Walker, D.G. Interdisciplinary Program in Material Science Vanderbilt University Nashville TN 37235 United States Department of Mechanical Engineering Vanderbilt University Nashville TN 37235 United States

ISBN: (纸本)0791837904

Confined structures presumably offer enhanced performance of thermoelectric devices. 1) Interfaces and boundaries create scattering sites for phonons, which reduces the thermal conductivity. 2) Reduced dimensionality increases the local density of states near the Fermi level, which increases the Seebeck coefficient. From these two phenomena, the net effect should be an increase in ZT, the performance parameter used to evaluate different materials and structures. These effects have been measured and modeled, but none of the models attempts to quantify the electron-phonon coupled effects particularly in the regime where quantum and scattering influences are found. Using the non-equilibrium Green's function (NEGF) approach, quantum wells composed of Si and Ge are studied and the important physics isolated. Results show a competing effect between the decrease in the electrical conductivity due to scattering with the increase in electrical conductivity with doping, leading to 77% decrease in the value of the power factor for the case of electron-optical phonon scattering. Copyright © 2006 by ASME.

关键词： Semiconductor superlattices

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Outcomes of a systems engineering project for K-12 teachers 122

Outcomes of a systems engineering project for K-12 teachers

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2015 122nd ASEE Annual Conference and Exposition

作者： Bartus, Greg Fisher, Frank T. Stevens Institute of Technology Center for Innovation in Engineering and Science Education United States Department of Mechanical Engineering United States Nanotechnology Graduate Program Stevens United States

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Magnetic resonance imaging of irreversible electroporation in tubers

Magnetic resonance imaging of irreversible electroporation i...

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12th Mediterranean Conference on Medical and Biological engineering and Computing, MEDICON 2010

作者： Hjouj, Mohammad Rubinsky, Boris Center for Bioengineering School of Computer Science Engineering Hebrew University of Jerusalem Israel Department of Mechanical Engineering Graduate Program in Biophysics University of California Berkeley United States

ISBN: (纸本)9783642130380

Purpose: A preliminary study on the magnetic resonance (MRI) characteristics of (vegetable) tissue NTIRE is an emerging minimally invasive surgery technique for tissue ablation in which, microsecond, high electrical field pulses form permanent nano-scale defects in the cell membrane. materials and Methods: The potato is used as the simplest conceivable first order tissue model for studying the MRI characteristics of electroporation, because while made of structured cells it does not have blood flow, it is relatively homogeneous and cell damage is readily visible through a natural oxidation process of the intracellular enzymes.. Clinical NTIRE sequences were applied to potato tubers and MRI sequences of the treated area were compared with colorimetric photographs. Results: A comparison of T1 weighted, T2 weighted, fluid attenuation inversion recovery (FLAIR) and short TI inversion recovery (STIR) of NTIRE shows that T1 weighted signals, such as FLAIR, produce brighter images of the treated areas. In contrast the images of the treated areas are completely lost with liquids enhancing and fat eliminating sequences, such as STIR. Conclusion: MRI can image tissue treated by NTIRE. A possible explanation for the findings is that by producing nanoscale defects in the cell membrane lipid bilayer, NTIRE causes an enhanced signal from the cell membrane lipids that in the treated cells are not bound anymore in a restrictive liquidgel membrane structure and have more degrees of freedom. © 2010 International Federation for Medical and Biological engineering.

关键词： Magnetic resonance imaging

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Evaluation of parameters effect on microstructure and mechanical properties in TIG welding of A105 to A106 steels 9th

Evaluation of parameters effect on microstructure and mechan...

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9th International Conference on Processing and Manufacturing of Advanced materials, THERMEC 2016

作者： Yousefi, Afshin Ghasemi, Davood Itoh, Goroh Graduate School of Science and Engineering Ibaraki University Hitachi316-8511 Japan Department of Material Science and Engineering Saveh Branch of Islamic Azad University Saveh Iran Department of Mechanical Engineering College of engineering Ibaraki University Hitachi316-8511 Japan

ISBN: (纸本)9783035711295

Welding parameters such as current intensity, voltage, number of passes can affect the mechanical properties of the weld. In this paper the effect of these parameters on structure and mechanical properties of welded A105 and A106 steels has been evaluated. According to the mechanical and microstructure test results, increasing in welding pass number causes reduction in grain size and increasing in average hardness of HAZ. Also inter-pass slag inclusion defect occurred in high number of passes. © 2017 Trans Tech Publications, Switzerland.

关键词： Microstructure

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Behavior of plane synthetic jets generated by an asymmetric stepped slot

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International Journal of Fluid Machinery and Systems 2020年第1期13卷 253-265页

作者： Kobayashi, Ryota Terakado, Hiroaki Sato, Kotaro Taniguchi, Junya Nishibe, Koichi Yokota, Kazuhiko Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Mechanical Engineering Program in the Graduate School of Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Department of Mechanical System Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan Graduate School of Integrative Science and Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Tokyo City University 1-28-1 Tamatsuzumi Setagaya-ku Tokyo158-8557 Japan Department of Mechanical Engineering Aoyama Gakuin University 5-10-1 Fuchinobe Sagamihara-shi Kanagawa252-5258 Japan

This paper presents a fundamental study of jet directional control, i.e., thrust vectoring, using a synthetic jet generated by an asymmetric stepped slot. We present and discuss the results for a synthetic jet generated by a one-sided asymmetric stepped slot and focus on the relationship between the traveling direction of the formed jet and the offset ratio of the stepped slot and/or dimensionless frequency of the synthetic jet, within a jet deflection angle range of 0–90°. We demonstrate that there is an optimum offset ratio for jet deflection under the same dimensionless frequency because the traveling direction of the synthetic jet is dependent on the offset ratio of the stepped slot and the dimensionless stroke length (dimensionless frequency). © 2020, Turbomachinery Society of Japan. All rights reserved.

关键词： Jets

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Numerical study of Newtonian fluid flows in t-shaped structures with impermeable walls

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Defect and Diffusion Forum 2019年第1期396卷 177-186页

作者： Da Rosa Pepe, Vinicius Rocha, Luiz Alberto Oliveira Zinani, Flávia Schwarz Franceschini Miguel, Antonio Ferreira Graduate Program in Mechanical Engineering Universidade Federal Do Rio Grande Do sul Rua Sarmento Leite 425 Porto Alegre RS90050-170 Brazil Graduate Program in Mechanical Engineering Universidade Do Vale Do Rio Dos Sinos Av. Unisinos 950 São Leopoldo RS Brazil Department of Physics School of Science and Technology University of Evora Largo dos Colegiais 2 Évora EVR7000 Portugal

This article presents the results of flows in "T" shaped duct bifurcations. The problem is to find the resistance to flow in three-dimensional (3D) structures with different homothetic relationships between sizes (diameters and lengths) of parent and daughter ducts. The method used is the Constructal Design, which is based on the Constructal Theory. The minimization of the global resistance to flow, subjected to geometric constraints of volume and area occupied by the ducts, is the key to search for optimum configurations. The flows investigated were three-dimensional, laminar, incompressible, in steady state, with uniform and constant properties. The results obtained numerically were verified via comparison with analytical results available in the literature. In this work, ranges of length and ratio of diameterss from 0.5 to 1 and 0.1 to 1, respectively, were investigated, for Reynolds numbers equal to 102 and 103. The main results indicate that the T-shaped structure with impermeable walls, agree with Hess-Murray's law. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Ducts

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On the Robustness of the xy-Zebra-Gauss-Seidel Smoother on an Anisotropic Diffusion Problem

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Computer Modeling in engineering & sciences 2018年第11期117卷 251-270页

作者： Michely Laís de Oliveira Marcio Augusto Villela Pinto Simone de Fátima Tomazzoni Goncalves Grazielli Vassoler Rutz Graduate Program in Numerical Methods in Engineering Federal University of Paraná81531-980Curitiba-PRBrazil Department of Mechanical Engineering Federal University of Paraná81531-980Curitiba-PRBrazil Federal Institute of Education Science and Technology of Santa Catarina89813-000Chapecó-SCBrazil.

Studies of problems involving physical anisotropy are applied in sciences and engineering,for instance,when the thermal conductivity depends on the *** this study,the multigrid method was used in order to accelerate the convergence of the iterative methods used to solve this type of *** asymptotic convergence factor of the multigrid was determined empirically(computer aided)and also by employing local Fourier analysis(LFA).The mathematical model studied was the 2D anisotropic diffusion equation,in whichε>0 was the coefficient of a *** equation was discretized by the Finite Difference Method(FDM)and Central Differencing Scheme(CDS).Correction Scheme(CS),pointwise Gauss-Seidel smoothers(Lexicographic and Red-Black ordering),and line Gauss-Seidel smoothers(Lexicographic and Zebra ordering)in x and y directions were used for building the *** best asymptotic convergence factor was obtained by the Gauss-Seidel method in the direction x for 0<ε<<1 and in the direction y forε>>*** this sense,an xy-zebra-GS smoother was proposed,which proved to be efficient and robust for the different anisotropy ***,the convergence factors calculated empirically and by LFA are in agreement.

关键词： Physical anisotropy diffusion problem finite difference method multigrid,local Fourier analysis Gauss-Seidel zebra

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DeePMD-kit v3: A Multiple-Backend Framework for Machine Learning Potentials

arXiv

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arXiv 2025年

作者： Zeng, Jinzhe Zhang, Duo Peng, Anyang Zhang, Xiangyu He, Sensen Wang, Yan Liu, Xinzijian Bi, Hangrui Li, Yifan Cai, Chun Zhang, Chengqian Du, Yiming Zhu, Jia-Xin Mo, Pinghui Huang, Zhengtao Zeng, Qiyu Shi, Shaochen Qin, Xuejian Yu, Zhaoxi Luo, Chenxing Ding, Ye Liu, Yun-Pei Shi, Ruosong Wang, Zhenyu Bore, Sigbjørn Løland Chang, Junhan Deng, Zhe Ding, Zhaohan Han, Siyuan Jiang, Wanrun Ke, Guolin Liu, Zhaoqing Lu, Denghui Muraoka, Koki Oliaei, Hananeh Singh, Anurag Kumar Que, Haohui Xu, Weihong Xu, Zhangmancang Zhuang, Yong-Bin Dai, Jiayu Giese, Timothy J. Jia, Weile Xu, Ben York, Darrin M. Zhang, Linfeng Wang, Han School of Artificial Intelligence and Data Science Unversity of Science and Technology of China Hefei China AI for Science Institute Beijing100080 China DP Technology Beijing100080 China Academy for Advanced Interdisciplinary Studies Peking University Beijing100871 China State Key Lab of Processors Institute of Computing Technology Chinese Academy of Sciences Beijing100871 China University of Chinese Academy of Sciences Beijing China Baidu Inc. Beijing China Department of Computer Science University of Toronto TorontoON Canada Department of Chemistry Princeton University PrincetonNJ08540 United States University of Chinese Academy of Sciences Beijing100871 China State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China College of Integrated Circuits Hunan University Changsha410082 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Smart Materials and Device Integration School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China College of Science National University of Defense Technology Changsha410073 China Hunan Key Laboratory of Extreme Matter and Applications National University of Defense Technology Changsha410073 China ByteDance Research Beijing100098 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Theoretical and Computational Photochemistry of Ministry of Education College of Chemistry Beijing Normal University Beijing100875 China Department of Geosciences Princeton University PrincetonNJ08544 United States Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States IKKEM Fujian Xiamen361005 China Graduate

In recent years, machine learning potentials (MLPs) have become indispensable tools in physics, chemistry, and materials science, driving the development of software packages for molecular dynamics (MD) simulations and related applications. These packages, typically built on specific machine learning frameworks such as TensorFlow, PyTorch, or JAX, face integration challenges when advanced applications demand communication across different frameworks. The previous TensorFlow-based implementation of DeePMD-kit exemplified these limitations. In this work, we introduce DeePMD-kit version 3, a significant update featuring a multi-backend framework that supports TensorFlow, PyTorch, JAX, and PaddlePaddle backends, and demonstrate the versatility of this architecture through the integration of other MLPs packages and of Differentiable Molecular Force Field. This architecture allows seamless backend switching with minimal modifications, enabling users and developers to integrate DeePMD-kit with other packages using different machine learning frameworks. This innovation facilitates the development of more complex and interoperable workflows, paving the way for broader applications of MLPs in scientific research. Copyright © 2025, The Authors. All rights reserved.

关键词： Molecular dynamics

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Surface quality improvement in CNC end milling machined aerospace AL-2017-T4 alloy using carbon onion nanolubrication with dlc cutting tool

Surface quality improvement in CNC end milling machined aero...

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2012 World Congress on engineering, WCE 2012

作者： Sayuti, M. Tanaka, Tomohisa Sarhan, Ahmed A. D. Saito, Yoshio Hamdi, M. Centre of Advanced Manufacturing and Material Processing Department of Design and Manufacturing University of Malaya Kuala Lumpur50603 Malaysia Department of Mechanical and Engineering Graduate School of Science and Engineering Tokyo Institute of Technology Tokyo Japan

ISBN: (纸本)9789881925220

Aerospace applications and energy saving strategies in general raised the interest and study in the field of lightweight materials, especially on aluminum alloys. Aluminum AL2017-T4 alloy which is used in this research work has low specific weight and high strength to rate ratio and also high electrical and thermal conductance. This alloy is widely used in industry and in particular in aircraft structure. The (CNC) milling machine facilities provides a wide variety of parameters setup, making the machining process of the duralumin AL-2017-T4 excellent in manufacturing complicated special products compared to other machining processes. However, the demand for high quality focuses attention on the surface condition and the quality of the product, especially the roughness of the machined surface, because of its effect on product appearance, function, and reliability. The key solution for this issue is by increasing the effectiveness of the existing lubrication systems as it could reduce the friction component in machining process. For more improvement, introducing the nanolubrication could produce much less friction in the tool chip interface as the rolling action of billions units of nanoparticle could reduce the coefficient of friction significantly. The tool selection is the other significant parameter for better machined surface quality. Diamond like carbon (DLC) coated tool application is providing less coefficient of friction between the tool chip contact surfaces. In this research work, the DLC coated tool has been used to machine the duralumin AL-2017-T4 while the carbon onion nanoparticle has been mixed with ordinary mineral oil as a nanolubrication system. The 38.68% reduction of surface roughness could be obtained when 1%wt of carbon onion nanolubricant concentration is used compared with the case of using ordinary lubrication. This is mainly attributed to the tribological properties of the DLC coated cutting tool in conjunction with the carbon onion nanolub

关键词： Surface properties

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