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Your search keyword '"Maruyama, Naoki"' showing total 972 results
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972 results on '"Maruyama, Naoki"'

1. Eigenvalue Fluctuations of 1-dimensional random Schr\'odinger operators

Author

Mashiko, Takuto, Marui, Yuma, Maruyama, Naoki, and Nakano, Fumihiko

Subjects
Mathematical Physics, Mathematics - Probability
Abstract

As an extension to the paper by Breuer, Grinshpon, and White \cite{B}, we study the linear statistics for the eigenvalues of the Schr\"odinger operator with random decaying potential with order ${\cal O}(x^{-\alpha})$ ($\alpha>0$) at infinity. We first prove similar statements as in \cite{B} for the trace of $f(H)$, where $f$ belongs to a class of analytic functions : there exists a critical exponent $\alpha_c$ such that the fluctuation of the trace of $f(H)$ converges in probability for $\alpha > \alpha_c$, and satisfies a CLT statement for $\alpha \le \alpha_c$, where $\alpha_c$ differs depending on $f$. Furthermore we study the asymptotic behavior of its expectation value.

Published
2022

5. Graph minor embedding of degenerate systems in quantum annealing

Author

Maruyama, Naoki, Ohzeki, Masayuki, and Tanaka, Kazuyuki

Subjects
Quantum Physics, Condensed Matter - Statistical Mechanics
Abstract

Quantum annealing, as currently implemented in hardware, cannot fairly sample all ground states. Graph minor embedding in a quantum annealer leads to biased sampling results. We demonstrate the influence of the embedding process on sampling results in a degenerate problem and analyze the details using perturbation theory. Our result also shows the relationship between the probabilities of ground states and the energy landscape between them., Comment: 2 pages, 3 figures

Published
2021

7. Tetragonality of Fe-C martensite -- a pattern matching electron backscatter diffraction analysis compared to X-ray diffraction

Author

Tanaka, Tomohito, Maruyama, Naoki, Nakamura, Nozomu, and Wilkinson, Angus J

Subjects
Condensed Matter - Materials Science
Abstract

Measurements of the local tetragonality in Fe-C martensite at microstructural length-scale through pattern matching of electron backscatter diffraction patterns (EBSPs) and careful calibration of detector geometry are presented. It is found that the local tetragonality varies within the complex microstructure by several per cent at largest and that the scatter in the axial ratio is increased at higher nominal carbon content. At some analysis points the local crystal structure can be regarded as lower symmetry than simple body centred tetragonal. A linear relation between the nominal carbon content and averaged local tetragonality measured by EBSD is also obtained, although the averaged axial ratio is slightly below that obtained from more classical X-ray diffraction measurements., Comment: 33 pages, 12 figures, 2 Tables

Published
2020
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13. Eigenvalue fluctuations of 1-dimensional random Schrödinger operators.

Author

Mashiko, Takuto, Marui, Yuma, Maruyama, Naoki, and Nakano, Fumihiko

Subjects
RANDOM operators, SCHRODINGER operator, CENTRAL limit theorem, EIGENVALUES, STATISTICS
Abstract

As an extension to the paper by Breuer et al., Ann. Henri Poincare 22, 3763 (2021), we study the linear statistics for the eigenvalues of the Schrödinger operator with random decaying potential with order O ( x − α ) (α > 0) at infinity. We first prove similar statements as in Breuer et al., Ann. Henri Poincare 22, 3763 (2021) for the trace of f(H), where f belongs to a class of analytic functions: there exists a critical exponent αc such that the fluctuation of the trace of f(H) converges in probability for α > αc, and satisfies a central limit theorem statement for α ≤ αc, where αc differs depending on f. Furthermore we study the asymptotic behavior of its expectation value. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Establishing a nanoimprint lithography ecosystem

Author

Tanaka, Hideo, primary, Hiura, Mitsuru, additional, Suzaki, Yoshio, additional, Yamamoto, Kiyohito, additional, Maruyama, Naoki, additional, Kimura, Atsushi, additional, Matsumoto, Takahiro, additional, Yamamoto, Kenji, additional, and Takabayashi, Yukio, additional

Published
2023
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25. Advances and applications in nanoimprint lithography

Author

Maruyama, Naoki, primary, Sato, Kazuhiro, additional, Suzaki, Yoshio, additional, Jimbo, Satoru, additional, Yamashita, Isamu, additional, Yamamoto, Kenji, additional, Yamamoto, Kiyohito, additional, Hiura, Mitsuru, additional, and Takabayashi, Yukio, additional

Published
2023
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34. Development of Two-Handed Multi-finger Haptic Interface SPIDAR-10

Author

Liu, Lanhai, Miyake, Satoshi, Maruyama, Naoki, Akahane, Katsuhito, Sato, Makoto, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Auvray, Malika, editor, and Duriez, Christian, editor

Published
2014
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36. Deimination in Prion Diseases

Author

Choi, Eun-Kyoung, Jang, Byungki, Ishigami, Akihito, Maruyama, Naoki, Carp, Richard I., Kim, Yong-Sun, Nicholas, Anthony P., editor, and Bhattacharya, Sanjoy K., editor

Published
2014
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41. 成人発症の微小変化型ネフローゼ症候群に対するプレドニゾロン初期投与量と，寛解，再発，及び感染症との関連

Author

Tanabe, Kaori, Samejima, Ken-ichi, Fukata, Fumihiro, Kosugi, Takaaki, Tsushima, Hideo, Morimoto, Katsuhiko, Okamoto, Keisuke, Matsui, Masaru, Eriguchi, Masahiro, Maruyama, Naoki, Akai, Yasuhiro, and Tsuruya, Kazuhiko

Subjects
Recurrence, Prednisolone, Remission induction, Minimal change disease, Cumulative steroid doses
Abstract

Background: A dose of 0.5-1 mg/kg/day of prednisolone (PSL) is administered for the initial treatment of minimal change disease (MCD). However, little is known about the optimal PSL dose for the initial treatment of MCD. Methods: We conducted a retrospective multicenter cohort study of treatment-naive adult patients with MCD diagnosed by renal biopsy from 1981 to 2015 in whom PSL monotherapy was performed as the initial treatment. The exposure of interest was an initial median PSL dose of < 0.63 mg/kg/day (Group L) compared to ≥ 0.63 mg/kg/day (Group H). Cumulative remission and relapse after remission were compared between these groups using Cox regression adjusted for baseline characteristics. Results: Ninety-one patients met the inclusion criteria. During a median follow-up of 2.98 years, 87 (95.6%) patients achieved complete remission, and 47.1% relapsed after remission. There was no significant difference in the remission rate between the groups at 4 weeks of follow-up (66.7 vs. 82.6%). The median time to remission in Group L was comparable to that in Group H (17.0 vs. 14.0 days). A multivariable Cox hazard model revealed that the initial PSL dose was not a significant predictor of remission. The cumulative steroid doses at 6 months, 1 year, and 2 years after treatment initiation were significantly lower in Group L than in Group H. Conclusion: The initial PSL dose was not associated with time to remission, remission rate, time to relapse, or relapse rate. Therefore, a low initial steroid dose may be sufficient to achieve remission., 博士（医学）・甲第803号・令和3年12月21日, © 2021. The Author(s). Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Published
2022

50. Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators.

Author

Samruaisin, Prachya, Maza, Rangsan, Thianpong, Chinaruk, Chuwattanakul, Varesa, Maruyama, Naoki, Hirota, Masafumi, and Eiamsa-ard, Smith

Subjects
HEAT transfer, HEAT exchangers, NUSSELT number, POTENTIAL energy, TUBES, VORTEX generators
Abstract

The influences of V-shaped delta-wing baffles on the thermohydraulic performance characteristics in a round tube were experimentally tested. The V-shaped delta-wing baffles having a set number of wings (N = 4, 6, and 8) were comparatively tested. The V-shaped delta-wing baffles with various pitch ratios of P/D = 2.0, 2.5, and 3.0 were thoroughly fitted inside a tube. In the present work, the baffles were responsible for both the recirculation/reverse flow behind the solid baffle and the longitudinal vortex flow behind the V-shaped wing. The V-shaped winged baffles with N = 8 produced high heat transfer rates by promoting the development of reverse and vortex flows. These currents aid in fluid mixing between the two streams. Experimental results suggested that utilizing V-shaped delta-wing baffles having N = 4, 6, and 8 led to Nusselt number enhancement of up to 97–105.6%, 105.8–127.8% and 114.8–138.9%, respectively. When N was 8, the V-shaped wings baffles created additional multi vortex flows, which resulted in some fluid mixing between the vortex and the reverse flow. It was discovered that a greater turbulent intensity is imparted to the flow that was occurring between the V-shaped delta-wing baffles, which led to an increase in the rate of heat transfer when the pitch ratio was decreased. The increase in Nusselt number was up to 118.26–151.3% more than it was in a tube with the lowest pitch ratio (P/D = 2.0). It was also found that the baffles with N = 8 wings and P/D = 3.0 offered a maximum aerothermal performance factor (APF) of 1.01. Furthermore, the V-shaped delta-wing baffles have the potential for energy savings at low Re ≤ 6000, indicated by the APF beyond unity. [ABSTRACT FROM AUTHOR]

Published
2023
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