Takaaki Shimura
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View article: Prediction of electrode microstructure evolutions with physically constrained unsupervised image-to-image translation networks
Prediction of electrode microstructure evolutions with physically constrained unsupervised image-to-image translation networks Open
Microstructure of electrodes determines the performance of electrochemical devices such as fuel cells and batteries. The efficiency and economic feasibility of these technologies depend on the stability of the microstructures throughout th…
View article: Subexponential densities of compound Poisson sums and the supremum of a random walk
Subexponential densities of compound Poisson sums and the supremum of a random walk Open
We characterize the subexponential densities on $(0,\infty)$ for compound Poisson distributions on $[0,\infty)$ with absolutely continuous Lévy measures. As a corollary, we show that the class of all subexponential probability density func…
View article: Dependence of Mainstream Angle of Vortex Generator Arrays on Heat Transfer Enhancement in Boundary Layer Flow on Flat Plate Based on Direct Numerical Simulation
Dependence of Mainstream Angle of Vortex Generator Arrays on Heat Transfer Enhancement in Boundary Layer Flow on Flat Plate Based on Direct Numerical Simulation Open
View article: Anisotropic Microstructural Evolution and Coarsening in Free Sintering and Constrained Sintering of Metal Film by Using FIB-SEM Tomography
Anisotropic Microstructural Evolution and Coarsening in Free Sintering and Constrained Sintering of Metal Film by Using FIB-SEM Tomography Open
View article: LDV Measurement of Turbulent Boundary Layer Flow under Streamwise Traveling Wave Control for Drag Reduction
LDV Measurement of Turbulent Boundary Layer Flow under Streamwise Traveling Wave Control for Drag Reduction Open
Drag reduction effect of travelling wave control for turbulent boundary layer flow is measured by laser doppler velocimetry (LDV). Travelling waves are generated on a rubber sheet by oscillation of a piezoelectric actuator. Experiment appa…
View article: Drag Reduction Effect of 3D-Printed Riblets with Various Shapes in Turbulent Taylor-Couette Flow
Drag Reduction Effect of 3D-Printed Riblets with Various Shapes in Turbulent Taylor-Couette Flow Open
Drag reduction effect of riblet in turbulent Taylor-Couette flow is experimentally investigated. A motor and a torque meter are installed at the top of the cylinders to investigate the effect of drag reduction by torque measurement. The ou…
View article: Electrode Microstructure Reconstruction from FIB-SEM Datasets with Anisotropic Resolutions
Electrode Microstructure Reconstruction from FIB-SEM Datasets with Anisotropic Resolutions Open
A framework for automated SOFC microstructure reconstruction from large asymmetric-resolution FIB-SEM datasets is proposed. Machine learning techniques are used for super-resolving the in-depth direction, i.e. FIB slicing direction, and fo…
View article: Angular dependence of blade for vortex induction in vibrating pipe flow aiming at heat transfer enhancement
Angular dependence of blade for vortex induction in vibrating pipe flow aiming at heat transfer enhancement Open
Experimental investigation was conducted on heat transfer enhancement in a vibrating pipe flow with blades. The test section is located at the end of a larger pipe to simulate a transition from turbulent to laminar flow as a consequence of…
View article: Effect of spatial development on convective heat transfer enhancement in a pipe with transverse vibration
Effect of spatial development on convective heat transfer enhancement in a pipe with transverse vibration Open
The present study models the flow configuration in a tube downstream of multi-branching in a catalytic converter. Convective heat transfer in a thin circular straight pipe is analyzed by direct numerical simulation (DNS). Forced transverse…
View article: Ni-GDC and Ni-YSZ electrodes operated in solid oxide electrolysis and fuel cell modes
Ni-GDC and Ni-YSZ electrodes operated in solid oxide electrolysis and fuel cell modes Open
In the present study, solid oxide cells (SOCs) were operated in the electricity generation (solid oxide fuel cell, SOFC) mode and the hydrogen production (solid oxide electrolysis cell, SOEC) mode. The fuel electrodes fabricated with nicke…
View article: Influence of Spatial Arrangement of Vortex Generators in a Boundary Layer Flow upon Heat Transfer Enhancement Effect
Influence of Spatial Arrangement of Vortex Generators in a Boundary Layer Flow upon Heat Transfer Enhancement Effect Open
Aiming at applying vortex generators (VGs) to a piston surface of a spark ignition engine for cooling the air-fuel mixture, direct numerical simulation of a laminar boundary layer flow was performed to investigate heat transfer enhancement…
View article: Visualization of Turbulent Flow Field with Fluorescently Labeled Polymer Additives by Simultaneous PIV/LIF Measurement and Investigation of Drag Reduction Mechanism
Visualization of Turbulent Flow Field with Fluorescently Labeled Polymer Additives by Simultaneous PIV/LIF Measurement and Investigation of Drag Reduction Mechanism Open
ポリマーを流体中に添加することによる抵抗低減メカニズムを，particle image velocimetry (PIV) / laser-induced fluorescence (LIF)同時計測により検証した．本研究では，蛍光物質を直接ポリマーに化学結合させた蛍光修飾ポリマーを用いることにより，LIF計測におけるポリマーの明瞭な可視化を実現した．PIVから得られた流れ場とLIFから得られたポリマーの分布から，ポリマーと流れ場の相関を検証した．ポリマーエリアにて，比較的…
View article: Optimal fabrication condition of La<sub>0.9</sub>Sr<sub>0.1</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> (LSCM) - Gd<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>x</sub> (GDC) composite anode for solid oxide fuel cell
Optimal fabrication condition of La<sub>0.9</sub>Sr<sub>0.1</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> (LSCM) - Gd<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>x</sub> (GDC) composite anode for solid oxide fuel cell Open
The degradation mechanisms of the conventional nickel-based solid oxide fuel cell (SOFC) anode are related to the poisoning, coarsening and redox instability of the Ni phase. In the present study, the fabrication process of Ni-free anode c…
View article: Prediction of Friction Drag in Pulsating Turbulent Pipe Flow
Prediction of Friction Drag in Pulsating Turbulent Pipe Flow Open
We carried out direct numerical simulation (DNS) of pulsating turbulent pipe flow and predicted the time evolution of the flow field by deep learning. Pulsation control is one of the turbulence control methods to realize drag reduction. A …
View article: Effect of vibration control on heat transfer in spatially developing pipe flow
Effect of vibration control on heat transfer in spatially developing pipe flow Open
Convective heat transfer of a pipe flow with vibration control is investigated by direct numerical simulation (DNS). This study aims at the application like a catalytic converter, which consists of thin tubes. The effect of spatial develop…
View article: Drag Reduction Effect of Turbulent Pipe Flow with Traveling Wavy Elastic Wall
Drag Reduction Effect of Turbulent Pipe Flow with Traveling Wavy Elastic Wall Open
Drag reduction effect of traveling wave control in turbulent pipe flow is experimentally investigated. A pipe is made of a rubber sheet in order to obtain a large wall deformation amplitude and it is set vertically. Three piezoelectric act…
View article: NONPARAMETRIC APPROACH TO THE DEPENDENCE OF JOINT EXTREME STATISTICS OF PRECIPITATION AT TWO LOCATIONS OWING TO THE LARGE SAMPLE SIZE OF D4PDF
NONPARAMETRIC APPROACH TO THE DEPENDENCE OF JOINT EXTREME STATISTICS OF PRECIPITATION AT TWO LOCATIONS OWING TO THE LARGE SAMPLE SIZE OF D4PDF Open
d4PDFのような大多数のアンサンブル標本データを用いれば，１変量降水量の極値特性のみならず，２変量の極大降水量の依存特性さえもノンパラメトリック手法で検討できる可能性がある．しかし，単純に数え上げるだけでは，データから得られる情報の無駄使いになるだけでなく，多変量の極値が満足すべき整合性を検討しないのは，応用に必要な論理に矛盾が生じるかもしれない．本論文では，同時極値のノンパラメトリック手法に不可欠な理論を示し，２地点間の距離が離れると，極大降水量の互いの依存性が弱まるこ…
View article: Evolution of electrochemical performance and microstructural change of <sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> air electrode in solid oxide fuel cells
Evolution of electrochemical performance and microstructural change of <sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> air electrode in solid oxide fuel cells Open
La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF) is a promising material of solid oxide fuel cell cathode for its high electrochemical reactivities. In this study, electrochemical performance evolutions of LSCF during discharge operations were evaluated bas…
View article: Prediction Model of Vortical Structure for Pulsating Control of Turbulent Pipe Flow Using Deep Learning
Prediction Model of Vortical Structure for Pulsating Control of Turbulent Pipe Flow Using Deep Learning Open
We performed direct numerical simulation of pulsating controlled flow for drag reduction and predicted time evolution of vortical structure distribution using deep learning. The datasets for the deep learning is the distribution of vortica…
View article: LSM/YSZ Cathode Aligned by Magnetic Field for Solid Oxide Fuel Cell
LSM/YSZ Cathode Aligned by Magnetic Field for Solid Oxide Fuel Cell Open
View article: Investigation of SOFC Ni-YSZ anode performance change mechanism during redox cycles
Investigation of SOFC Ni-YSZ anode performance change mechanism during redox cycles Open
Mechanism of performance change in Ni-YSZ anode of solid oxide fuel cell under redox cycles was investigated by microstructure analysis and electrochemical simulation. Performance enhancement was observed just after the redox treatment, an…
View article: J0560205 Performance evaluation of an anode with aligning orbicular Ni particles by magnetic field
J0560205 Performance evaluation of an anode with aligning orbicular Ni particles by magnetic field Open
Solid oxide fuel cells (SOFCs) consist of three layers; a cathode, an electrolyte and an anode. The anode consists of three phases; yittria-stabilized zirconia (YSZ), Ni and pore. In the anode, O^, electrons, and gases pass through in YSZ,…