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Hybrid Strategy of Partitioned and Monolithic Methods for Solving Strongly Coupled Analysis of Inverse and Direct Piezoelectric and Circuit Coupling

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1371-1386页

作者： Daisuke Ishihara Syunnosuke Nozaki tomoya Niho Naoto Takayama Department of Intelligent and Control Systems Kyushu Institute of TechnologyFukuokaJapan

The inverse and direct piezoelectric and circuit coupling are widely observed in advanced electro-mechanical systems such as piezoelectric energy *** strongly coupled analysis methods based on direct numerical modeling for this phenomenon can be classified into partitioned or monolithic *** formulation has its advantages and disadvantages,and the choice depends on the characteristics of each coupled *** study proposes a new option:a coupled analysis strategy that combines the best features of the existing formulations,namely,the hybrid partitioned-monolithic *** analysis of inverse piezoelectricity and the monolithic analysis of direct piezoelectric and circuit interaction are strongly coupled using a partitioned iterative hierarchical *** a typical benchmark problem of a piezoelectric energy harvester,this research compares the results from the proposed method to those from the conventional strongly coupled partitioned iterative method,discussing the accuracy,stability,and computational *** proposed hybrid concept is effective for coupled multi-physics problems,including various coupling conditions.

关键词： Structure-piezoelectric-circuit interaction energy harvesting partitioned method monolithic method hybrid method

Natural Convection Melting in a Rectangular Heat Storage Tank of Carbon Nanotube Dispersed Latent Heat Storage Material

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA tomoya SAITO Kazunori TAKAI Yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa_(2)Cu_(3)O_(7-δ)thin films with Y_(2)BaCuO_(5)nanoinclusions

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Superconductivity 2024年第1期9卷 95-105页

作者： Alok K.Jha Kaname Matsumoto tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele Yutaka Yoshida Satoshi Awaji Department of Materials Science and Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Department of Mechanical and Control Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Central Research Institute of Electrical Power Industry YokosukaKanagawa 240-0196Japan College of Engineering-Innovative Global Program Shibaura Institute of TechnologyMinuma-kuSaitama 337-8570Japan Department of Energy Engineering and Science Nagoya UniversityChikusa-kuNagoya 464-8603Japan Institute for Materials Research Tohoku UniversityAoba-kuSendai 980-8577Japan

The pinning of quantized magnetic vortices in superconducting YBa_(2)Cu_(3)O_(7-δ)(YBCO or Y123)thin films with Y_(2)BaCuO_(5)(Y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target *** pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of YBCO+Y211 nanocomposite films.Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of *** the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle *** larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower *** of the temperature dependence of J_(c)for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关键词： YBCO thin film Critical current Vortex pinning Nanoscale APCs

Effects of catalyst loading amount on the synthesis of poly（3-hexylthiophene） via externally initiated Kumada catalyst-transfer polycondensation

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Frontiers of Materials Science 2014年第4期8卷 383-390页

作者： Jin WANG tomoya HIGASHIHARA Advanced Materials Division Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences 398 Ruoshui Road Suzhou 215123 China Department of Polymer Science and Engineering Faculty of Engineering Yamagata University 4-3-16 Jonan Yonezawa City Yamaqata 992-8510 Japan Japan Science and Technology Agency (JST) 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan

A series of model polymerization are carried out via the one-pot externally initiated Kumada catalyst-transfer polycondensation （KCTP） of 2-bromo-5-chloromagne- slum thiophene monomers, and the excess amount of initiators or catalysts are found no need to be isolated during the polycondensation process. Especially, the impacts of the nickel catalyst loading variation on regioregularity （rr）, yield, molecular weight （Mn）, polydispersity （PDI） and initiation efficiency of poly（3-hexylthiophene）（P3HT） are systematically investigated. The IH NMR, size-exclusion chromatography （SEC）, and MALDI-TOF mass spectroscopy results indicated that an excess amount of catalyst does not influence yield, rr, Mn, and PDI of P3HT, nor the initiation efficiency. However, the PDI of the product is broad, and the Mn and rr values decreased in the absence of 1,3-bis （diphenylphosphino）propane （dppp）. It can be concluded that the in-situ KCTP polymerization of P3HT is a practical and effective process. These results are especially valuable for the synthesis of all-conjugated block copolymers where macroinitiators are used.

关键词： Kumada catalyst-transfer polycondensation (KCTP) poly(3-hexylthio-phene) (P3HT) regioregularity (rr)

Real-time rendering of layered materials with anisotropic normal distributions

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Computational Visual Media 2020年第1期6卷 29-36页

作者： tomoya Yamaguchi Tatsuya Yatagawa Yusuke Tokuyoshi Shigeo Morishima Waseda University Tokyo155-8885Japan The University of Tokyo Tokyo153-8656Japan Intel Corporation CA95054USA

This paper proposes a lightweight bidirectional scattering distribution function(BSDF)model for layered materials with anisotropic reflection and refraction *** our method,each layer of the materials can be described by a microfacet BSDF using an anisotropic normal distribution function(NDF).Furthermore,the NDFs of layers can be defined on tangent vector fields,which differ from layer to *** method is based on a previous study in which isotropic BSDFs are approximated by projecting them onto base ***,the adequateness of this previous work has not been well investigated for anisotropic *** this paper,we demonstrate that the projection is also applicable to anisotropic BSDFs and that the BSDFs are approximated by elliptical distributions using covariance matrices.

关键词： layered materials microfacet BSDF reflection modeling real-time rendering

Immersed Interface CIP for One Dimensional Hyperbolic Equations

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Communications in Computational Physics 2014年第6期16卷 96-114页

作者： Kazufumi Ito tomoya Takeuchi Department of Mathematics North Carolina State UniversityRaleighNC 27695USA. Collaborative Research Center for Innovative Mathematical Modelling Institute of Industrial ScienceUniversity of TokyoTokyoJapan. FIRST Aihara Innovative Mathematical Modelling ProjectJSTKawaguchiJapan.

The immersed interface technique is incorporated into CIP method to solve one-dimensional hyperbolic equations with piecewise constant *** proposed method achieves the third order of accuracy in time and space in the vicinity of the interface where the coefficients have jump discontinuities,which is the same order of accuracy of the standard CIP *** numerical tests are given to verify the accuracy of the proposed method.

关键词： CIP method immersed interface method hyperbolic equations in discontinuous media.

Multi-parameter Tikhonov Regularization—An Augmented Approach

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Chinese Annals of Mathematics,Series B 2014年第3期35卷 383-398页

作者： Kazufumi ITO Bangti JIN tomoya TAKEUCHI Center for Research in Scientific Computation & Department of Mathematics North Carolina State University Department of Mathematics University of California Riverside 900 University Ave.Riverside CA92521 USA. Collaborative Research Center for Innovative Mathematical Modelling Institute of Industrial ScienceThe University of Tokyo 4-6-1-Cw601 Komaba Meguro-ku Tokyo 153-8505 Japan.

We study multi-parameter regularization(multiple penalties) for solving linear inverse problems to promote simultaneously distinct features of the sought-for objects. We revisit a balancing principle for choosing regularization parameters from the viewpoint of augmented Tikhonov regularization, and derive a new parameter choice strategy called the balanced discrepancy principle. A priori and a posteriori error estimates are provided to theoretically justify the principles, and numerical algorithms for efficiently implementing the principles are also provided. Numerical results on deblurring are presented to illustrate the feasibility of the balanced discrepancy principle.

关键词： Multi-parameter regularization Augmented Tikhonov regularization Balanced discrepancy principle

21世纪初东亚乡村发展和规划实践及若干启迪

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国际城市规划 2024年第4期39卷 118-126页

作者：张立谭添李雯骐锻冶智也李仁熙同济大学建筑与城市规划学院城市规划系上海同济城市规划设计研究院有限公司中国城市规划学会小城镇规划学术委员会英国纽卡斯尔大学明治学院大学法学院釜山大学建筑学院

进入21世纪以来,日本、韩国和我国台湾地区等东亚经济体相继进入乡村发展的新阶段。笔者从城乡联系、农业发展、人居环境、乡村治理四个视角,系统梳理东亚乡村发展和规划的新近实践和研究进展,以期为当下我国内地的乡村发展和规划提供... 详细信息

进入21世纪以来,日本、韩国和我国台湾地区等东亚经济体相继进入乡村发展的新阶段。笔者从城乡联系、农业发展、人居环境、乡村治理四个视角,系统梳理东亚乡村发展和规划的新近实践和研究进展,以期为当下我国内地的乡村发展和规划提供有益借鉴。在城乡联系方面,东亚经济体已普遍进入城镇化发展的后期阶段,注重促进城乡要素的双向流动和乡村社会福利水平提升;在农业发展方面,提倡农业的生态化和智慧化发展,在保持小农基础上不断促进经营主体的集中,持续推进三次产业深度融合,并重视引入和培育新型专业化农民;在人居环境方面,强调设施配置的城乡公平性、闲置空间资源的再利用、应对灾害的韧性和文化景观的保护传承;在乡村治理方面,充分认识到上下共治的社会治理重要性,并不断完善乡村空间治理体系。最后,笔者探讨了东亚经济体的相关经验对我国内地乡村发展和规划研究的若干启迪。

关键词：东亚乡村乡村发展乡村规划乡村人居日本韩国台湾地区

Point Sources Identification Problems for Heat Equations

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Communications in Computational Physics 2009年第5期5卷 897-913页

作者： Leevan Ling tomoya Takeuchi Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong Graduate School of Mathematical Sciences University of Tokyo3-8-1 KomabaMeguroTokyo153-8914Japan

We considered the point source identification problems for heat equations from noisy observation data taken at the minimum number of spatially fixed measurement *** aim to identify the unknown number of sources and their locations along with their *** our previous work,we proved that minimum measurement points needed under the noise-free *** this paper,we extend the proof to cover the noisy cases over a border class of source *** show that if the regularization parameter is chosen properly,the problem can be transformed into a poles identification problem.A reconstruction scheme is proposed on the basis of the developed theoretical *** demonstrations in 2D and 3D conclude the paper.

关键词： Point source source identification heat equations noisy data convergence