A5101941639- Block Copolymer Self-Assembly
- Rheology and Fluid Dynamics Studies
- Optical measurement and interference techniques
- Advanced Measurement and Metrology Techniques
- Nuclear physics research studies
- Speech Recognition and Synthesis
- Gastrointestinal Bleeding Diagnosis and Treatment
- Advanced Optical Imaging Technologies
- Magnetic Properties and Applications
- Nuclear Physics and Applications
- Surface Roughness and Optical Measurements
- Advanced Vision and Imaging
- Machine Learning in Materials Science
- Polymer crystallization and properties
- Computer Graphics and Visualization Techniques
- Digital Holography and Microscopy
- Optical Systems and Laser Technology
- Micro and Nano Robotics
- Microstructure and Mechanical Properties of Steels
- Photorefractive and Nonlinear Optics
- Image and Signal Denoising Methods
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Phonetics and Phonology Research
- GaN-based semiconductor devices and materials
Kyushu Institute of Technology
2006-2024
Ochanomizu University
2024
Mitsubishi Heavy Industries (Germany)
2017-2024
Eon Corporation (United States)
2015-2022
Japan Association for Development of Community Medicine
2021
Syreon Corporation (Canada)
2015-2019
Zeon (Japan)
2016
Toyama Prefectural University
2016
Tohoku University
1983-2012
Meiji University
1990-2012
A new type of micro swimming mechanism is proposed for microrobots working in water. It composed a small magnet attached to spiral wire. An external alternating magnetic field causes the rotate due torque. As result, can swim propelled by waves traveling along spiral. The velocity increases linearly with increasing excitation frequency, and rate depends on shape experimental agrees calculation result based upon Lighthill's theory (1975, 1976).
The molecular mechanism of the strain–stress behavior ABA triblock copolymer is studied by combining self-consistent field (SCF) calculation and dynamics (MD) simulation. First, equilibrium structure was obtained SCF calculation. bridge fraction φbridge found to be about 0.4, 0.6, 0.8 for lamellar, cylindrical, spherical phases, respectively. From segment distribution calculated SCF, chain configuration generated method reported previously [Aoyagi et al., Comput. Phys. Comm. 145, 267...
An order−order transition from a bicontinious double-gyroid (G) structure to hexagonally packed cylinder (C) induced by an external flow is simulated using real-space dynamical self-consistent field technique. To simulate the structural change correctly, we introduce system size optimization technique which emergence of artificial intermediate structures are suppressed. When shear in [111] direction G unit cell imposed, nucleation C domains followed stable coexistence between phase and...
An algorithm was developed for self-consistent field theory (SCFT) simulations of loop-containing polymers (LCPs), where the total number independent loops (fundamental cycles in polymer structure) is characterized by "cycle rank." Although various multi-ring and cage-like have been reported, there no explicit SCFT scheme LCPs with multiple loops. LCP cut to open its fundamental form a pseudo-tree-like polymer. Conventional calculations require extra spatial constraints on pseudo-free...
Gyroid-to-cylinder transition in a diblock copolymer melt under an electric field is studied by real-space dynamical self-consistent-field theory. Starting from equilibrium gyroid structure, we apply along [111], [11̄0], and [112̄] directions of the conventional unit cell structure. Under sufficiently high value field, epitaxial to cylinders occurs. Contrary case similar shear flow, observe 5-fold connections as intermediates transition. We found critical behavior lifetime initial which can...
Abstract Artificial intelligence relying on structure-property databases is an emerging powerful tool to discover new materials with targeted properties. However, this approach cannot be easily applied tangible structures, such as plastic composites and fabrics, because of their high structural complexity. Here, we propose a deep learning computational framework that can implement virtual experiments structures. Structural representations complex carbon nanotube films were conducted by...
The electric quadrupole moment Q for the ground state of ${}^{17}\mathrm{B}$ was determined by $\ensuremath{\beta}$-NMR method applied to spin-polarized projectile fragments. From measured coupling constant, $|{eqQ/h(}^{17}\mathrm{B}\mathrm{in}\mathrm{}\mathrm{Mg})|=137.4\ifmmode\pm\else\textpm\fi{}4.5\mathrm{kHz},$ in a Mg single crystal stopper deduced as $|{Q(}^{17}\mathrm{B})|=38.6\ifmmode\pm\else\textpm\fi{}1.5\mathrm{mb}.$ As case previous ${}^{15}\mathrm{B}$ result, obtained is very...
Using self-consistent-field simulation, a perforated lamella (PL) is investigated under an applied electric field. The obtained by confining cylinder-forming diblock copolymer melt in thin film with thickness of the spacing between cylinders bulk equilibrium state. Upon application field, transforms to laying or standing depending on direction
Dynamic self-consistent field theory and Navier-Stokes equation are coupled to study hydrodynamic effects on the disorder-to-order transition of diblock copolymer melts. Simulations performed for different values viscosity results compared with those without effects. The lower is, faster free energy density decays. Starting from uniformly mixed initial states, body-centered-cubic spheres, hexagonally packed cylinders, lamellar structures obtained in presence On contrary, bicontinuous double...
Phase transition from body-centered-cubic spheres to cylinders in a diblock copolymer melt under an external electric field is investigated by means of real-space dynamical self-consistent theory. Different phase kinetic pathways and different cylindrical domains arrangements the final are observed depending on strength direction applied field. Various transient states have been identified being along [111], [100], [110] directions. The should be above certain threshold value order occur. A...
Abstract In this study, deep learning (DL)-based estimation of the Flory–Huggins χ parameter A-B diblock copolymers from two-dimensional cross-sectional images three-dimensional (3D) phase-separated structures were investigated. 3D with random networks domains generated real-space self-consistent field simulations in 25–40 N range for chain lengths ( ) 20 and 40. To confirm that prepared data can be discriminated using DL, image classification was performed VGG-16 network. We comprehensively...
A method for estimating electrical current distribution in the human brain using a multiple dipole model is presented. cost function dipoles proposed and simulated annealing algorithm used to obtain an acceptable solution. Computer simulation evaluate effectiveness of this method.
Transmission electron microscopy and selected area diffraction have been used to investigate the microstructures of directionally solidified eutectic composite a Ni-12.7 at%Al-21.6 at%Mo alloy. The as-grown consists Mo fibers square or rectangular cross-sections surrounded by an ordered γ′ phase. Between phase regions multi-phase region is formed. A analysis suggested that Ni3Mo(tetragonal D022), Ni2Mo(body-centered orthorhombic) γ(face-centered cubic) matrix phases. Heating above 1490 K...
We propose a high-speed and accurate hybrid dynamic density functional theory for the computer simulations of phase separation processes polymer melts blends. The proposed is combination self-consistent-field (SCF) time-dependent Ginzburg−Landau type with random approximation (GRPA). SCF known to be in evaluating free energy systems both weak strong segregation regions although it has disadvantage requirement considerable amount computational cost. On other hand, GRPA an advantage much...
Transformation of a perforated lamella an ABA triblock copolymer melt confined in thin film under electric field is studied by real-space dynamical self-consistent theory. Starting from structure, we apply along [100] and [010] directions which are parallel to the surfaces film, [001] direction perpendicular film. With sufficiently high value field, transitions cylinders or lamellae occur. Several kinetic pathways have been found, some very different ones observed for AB diblock copolymer.
The influence of ageing treatments on the hardness and microstructure directionally solidified eutectic composite a Ni-12.7 at%Al-21.6 at%Mo alloy has been investigated. On at temperatures between 873 1373 K after quenching from 1533 two kinds precipitates are formed in γ phase depending upon temperature time. At below 1100 K, fine coherent metastable orthorhombic Ni2Mo is formed. By above Mo platelets precipitate matrix expense Ni2Mo. material changes appreciably by treatments.
A new concept of the microactuation driven by magnetostriction is proposed. We fabricated two kinds cantilever actuators and a travelling machine, composed magnetostrictive thin films on polyimide film. Amorphous Tb-Fe Sm-Fe were used as materials. These moved without power supply cable exhibited large deflection in low magnetic fields. Such unique characteristics suggest that suitable for driving force microactuator.