The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform
Taketoshi Nojima - One of the best experts on this subject based on the ideXlab platform.
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Development of Light-Weight Rigid Core Panels
Journal of Solid Mechanics and Materials Engineering, 2020Co-Authors: Kazuya Saito, Taketoshi NojimaAbstract:By processing triangle or square pyramid shaped indents on a flat sheet, panels with periodical indents in regular plane tiling patterns are manufactured. Highly rigid core panels are newly developed by setting this panel (as top panel) on a reversed one (as bottom panel), and gluing/welding them at the apexes of pyramids to the vertexes of the tiling patterns in the bottom panel. The basic Model named Dia-Core is a panel created in the form of Octet-Truss developed by Fuller which corresponds to the space filling Model consisting of a combination of two tetrahedra and one octahedron. By varying the geometric patterns that appear on the panel surfaces, all possible patterns based on geometrical considerations are devised, systematically creating various modified Models with larger welding portions.
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Modeling of New Light-Weight, Rigid Core Panels Based on Geometric Plane Tilings and Space Fillings
Transactions of the Japan Society of Mechanical Engineers. A, 2020Co-Authors: Kazuya Saito, Taketoshi NojimaAbstract:By processing triangle or square pyramid shaped indents on a flat sheet, panels with periodical indents in regular plane tiling patterns are manufactured. Highly rigid core panels are newly developed by setting this panel (as top panel) on a reversed one (as bottom panel), and gluing/ welding them at the apexes of pyramids to the vertexes of the tiling patterns in the bottom panel. The basic Model named Dia-Core is a panel created in the form of Octet-Truss developed by Fuller which corresponds to the space filling Model consisting of a combination of two tetrahedra and one octahedron. By varying the geometric patterns that appear on the panel surfaces, all possible patterns based on geometrical considerations are devised, systematically creating various modified Models with larger welding portions.
Kazuya Saito - One of the best experts on this subject based on the ideXlab platform.
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Development of Light-Weight Rigid Core Panels
Journal of Solid Mechanics and Materials Engineering, 2020Co-Authors: Kazuya Saito, Taketoshi NojimaAbstract:By processing triangle or square pyramid shaped indents on a flat sheet, panels with periodical indents in regular plane tiling patterns are manufactured. Highly rigid core panels are newly developed by setting this panel (as top panel) on a reversed one (as bottom panel), and gluing/welding them at the apexes of pyramids to the vertexes of the tiling patterns in the bottom panel. The basic Model named Dia-Core is a panel created in the form of Octet-Truss developed by Fuller which corresponds to the space filling Model consisting of a combination of two tetrahedra and one octahedron. By varying the geometric patterns that appear on the panel surfaces, all possible patterns based on geometrical considerations are devised, systematically creating various modified Models with larger welding portions.
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Modeling of New Light-Weight, Rigid Core Panels Based on Geometric Plane Tilings and Space Fillings
Transactions of the Japan Society of Mechanical Engineers. A, 2020Co-Authors: Kazuya Saito, Taketoshi NojimaAbstract:By processing triangle or square pyramid shaped indents on a flat sheet, panels with periodical indents in regular plane tiling patterns are manufactured. Highly rigid core panels are newly developed by setting this panel (as top panel) on a reversed one (as bottom panel), and gluing/ welding them at the apexes of pyramids to the vertexes of the tiling patterns in the bottom panel. The basic Model named Dia-Core is a panel created in the form of Octet-Truss developed by Fuller which corresponds to the space filling Model consisting of a combination of two tetrahedra and one octahedron. By varying the geometric patterns that appear on the panel surfaces, all possible patterns based on geometrical considerations are devised, systematically creating various modified Models with larger welding portions.
Tobias Hertel - One of the best experts on this subject based on the ideXlab platform.
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13 nm Exciton Size in (6,5) Single-Wall Carbon Nanotubes
Journal of Physical Chemistry Letters, 2016Co-Authors: Christoph Mann, Tobias HertelAbstract:Electron–hole correlation lengths, also termed exciton size, for (6,5) single-wall carbon nanotubes (SWNTs) are determined using femtosecond time-resolved pump–probe spectroscopy. The phase space filling Model is used to obtain the sizes of the first subband exciton in samples of isolated and of bundled SWNTs. The experiments indicate that the exciton size of (13 ± 3) nm is a factor of 6 higher than previous experimental estimates and theoretical predictions for vacuum suspended SWNTs. This surprising result may be attributed at least in part to the effect of the dielectric environment on exciton sizes and supports recent theoretical findings predicting that screening in SWNTs may enhance rather than reduce electron–hole interactions for separations larger than the tube diameter. Thereby, the work also points to the unique nature of screening and electronic correlations in one-dimensional semiconductors.
Arao Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Photophysics in Single-Walled Carbon Nanotubes with (6,4) Chirality at High Excitation Densities: Bimolecular Auger Recombination and Phase-Space Filling of Excitons
Journal of Physical Chemistry C, 2013Co-Authors: Takeshi Koyama, Yasumitsu Miyata, Hideo Kishida, Hisanori Shinohara, Arao NakamuraAbstract:The photophysics in single-walled carbon nanotubes (SWNTs) at high excitation densities has been attracting significant attention for exciton stability. Exciton–exciton interactions and an exciton Mott transition of quasi-one-dimensional excitons in SWNTs are of fundamental interest because the screening effect of the Coulomb interaction is suppressed in one-dimensional systems. In this study, we investigate exciton dynamics and a bimolecular Auger recombination process in SWNTs with (6,4) chirality using femtosecond transient absorption measurements at high excitation densities in the range of 2.4 × 1013–4.8 × 1015 photons cm–2 per pulse. Temporal evolutions of the change in the absorption coefficient are analyzed with an analytical expression for the bimolecular Auger recombination dynamics. We determine the Auger recombination coefficient and initial exciton number per tube, and the absorption cross section is also obtained. By using the phase-space filling Model, the exciton size is estimated to be 3....
Chi Wu - One of the best experts on this subject based on the ideXlab platform.
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comparison of the coil to globule and the globule to coil transitions of a single poly n isopropylacrylamide homopolymer chain in water
Macromolecules, 1998Co-Authors: Xiaohui Wang, Chi WuAbstract:Using a newly prepared nearly monodisperse (Mw/Mn < 1.05) high molar mass (Mw = 1.3 107 g/mol) poly(N-isopropylacrylamide) (PNIPAM) sample, we successfully, for the first time, made the conformation of individual PNIPAM chains change from a coil to a fully collapsed thermodynamically stable single chain globule and then back to a coil in an extremely dilute aqueous solution (6.7 10-7 g/mL). The average chain density in the globule state is 0.34 g/mL, close to 0.40 g/cm3 predicted on the basis of a Space-Filling Model, indicating that the globule still contains 66% water even in its fully collapsed state. At a given temperature around the lower critical solution temperature, the chains are smaller in the globule-to-coil transition than in the coil-to-globule transition, revealing that the coil-to-globule transition is an irreversible process. The hysteresis can be attributed to the formation of intrachain structures, presumably the intrachain hydrogen bonding, in the globule state. We confirmed the existen...