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1,191 results on '"Nakamura, Koichi"'

3. Optical properties of monolayer, multilayer, and bulk BiI$_3$ studied using time-dependent density functional theory

Author

Habe, Tetsuro and Nakamura, Koichi

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

We investigate the optical property of monolayer and layered BiI$_3$ and reveal the presence of exciton only in the monolayer crystal. We evaluate the energy spectrum of a dielectric function by using time-dependent density functional theory. Bulk crystal of BiI$_3$ is an atomic layered semiconductor with the band gap corresponding to the frequency of visible light. The numerical result for the bulk crystal is confirmed to be consistent with the previous experimental results and it does not depend on the number of layers except the monolayer. We reveal the excitons appearing below the resonant peak associated with the inter-band excitation in the monolayer crystal. The unique optical property can be directly observed in the optical absorption or differential reflectance spectrum and distinguish the monolayer crystal from the stacked BiI$_3$., Comment: 6 pages, 6 figures

Published
2021
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4. Prediction of the debulking effect of rotational atherectomy using optical frequency domain imaging: a prospective study

Author

Hamana, Tomoyo, Kawamori, Hiroyuki, Toba, Takayoshi, Nishimori, Makoto, Tanimura, Kosuke, Kakizaki, Shunsuke, Nakamura, Koichi, Fujimoto, Daichi, Sasaki, Satoru, Osumi, Yuto, Fujii, Masayoshi, Iwane, Seigo, Yamamoto, Tetsuya, Naniwa, Shota, Sakamoto, Yuki, Fukuishi, Yuta, Matsuhama, Koshi, Hirata, Ken-ichi, and Otake, Hiromasa

Published
2023
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5. Clinical impact of optical coherence tomography findings after drug-coated balloon treatment for patients with acute coronary syndromes

Author

Yamamoto, Tetsuya, Kawamori, Hiroyuki, Toba, Takayoshi, Kakizaki, Shunsuke, Nakamura, Koichi, Fujimoto, Daichi, Sasaki, Satoru, Fujii, Hiroyuki, Hamana, Tomoyo, Osumi, Yuto, Iwane, Seigo, Naniwa, Shota, Sakamoto, Yuki, Matsuhama, Koshi, Fukuishi, Yuta, Kozuki, Amane, Shite, Junya, Iwasaki, Masamichi, Ishida, Akihiko, Hirata, Ken-ichi, and Otake, Hiromasa

Published
2023
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7. Real-world clinical outcomes of percutaneous transluminal septal myocardial ablation for patients with drug-refractory hypertrophic obstructive cardiomyopathy: results from a retrospective multicenter registry of non-high-volume centers

Author

Nakamura, Koichi, Toba, Takayoshi, Otake, Hiromasa, Kakizaki, Shunsuke, Fujimoto, Daichi, Takahashi, Yu, Fukuyama, Yusuke, Kawamori, Hiroyuki, Tanaka, Hidekazu, Takaya, Tomofumi, Iwasaki, Masamichi, Kozuki, Amane, Kawai, Hiroya, Hayashi, Takatoshi, Shite, Junya, and Hirata, Ken-ichi

Published
2022
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10. Cholesterol uptake capacity: A new measure of high-density lipoprotein functionality as a predictor of subsequent revascularization in patients undergoing percutaneous coronary intervention

Author

Fujimoto, Daichi, Otake, Hiromasa, Kawamori, Hiroyuki, Toba, Takayoshi, Nagao, Manabu, Nakano, Shinsuke, Tanimura, Kosuke, Takahashi, Yu, Fukuyama, Yusuke, Kakizaki, Shunsuke, Nakamura, Koichi, Harada, Amane, Murakami, Katsuhiro, Iino, Takuya, Toh, Ryuji, and Hirata, Ken-ichi

Published
2022
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15. How Lesson Study Helps Student Teachers Learn How to Teach Mathematics through Problem-Solving: Case Study of a Student Teacher in Japan

Author

Nakamura, Koichi, Kaiser, Gabriele, Series Editor, Sriraman, Bharath, Series Editor, Borba, Marcelo C., Editorial Board Member, Cai, Jinfa, Editorial Board Member, Knipping, Christine, Editorial Board Member, Kwon, Oh Nam, Editorial Board Member, Schoenfeld, Alan, Editorial Board Member, Huang, Rongjin, editor, Takahashi, Akihiko, editor, and da Ponte, João Pedro, editor

Published
2019
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25. PSDF: Particle Stream Data Format for N-Body Simulations

Author

Farr, Will M., Ames, Jeff, Hut, Piet, Makino, Junichiro, McMillan, Steve, Muranushi, Takayuki, Nakamura, Koichi, Nitadori, Keigo, and Zwart, Simon Portegies

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present a data format for the output of general N-body simulations, allowing the presence of individual time steps. By specifying a standard, different N-body integrators and different visualization and analysis programs can all share the simulation data, independent of the type of programs used to produce the data. Our Particle Stream Data Format, PSDF, is specified in YAML, based on the same approach as XML but with a simpler syntax. Together with a specification of PSDF, we provide background and motivation, as well as specific examples in a variety of computer languages. We also offer a web site from which these examples can be retrieved, in order to make it easy to augment existing codes in order to give them the option to produce PSDF output., Comment: 5 pages; submitted to New Astronomy

Published
2012
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27. Enhancing the thermoelectric properties for hot-isostatic-pressed Bi2Te3 nano-powder using graphite nanoparticles.

Author

Mansour, Mohamed Abdelnaser, Nakamura, Koichi, and AbdEl-Moneim, Ahmed

Abstract

Bismuth telluride (Bi2Te3) is a promising thermoelectric material produced commercially. However, its poor electrical conductivity and low figure of merit, caused by grain boundaries and high thermal conductivity, limit its effectiveness in powder metallurgy production. Herein, effects of adding Graphite nanoparticles (GTNPs) to Bi2Te3 on thermoelectric properties were studied. Three ratios of GTNPs (0.2, 0.35, 0.5 wt%) were added to ball-milled Bi2Te3 nano-powder. The hot isostatic pressing (HIP) sintering technique was employed to prepare the pristine Bi2Te3 and the BT-xGTNPs samples for testing. The crystallographic measurements showed a reduction in the crystallinity of the BT-xGTNPs samples compared to the pure Bi2Te3, whereas the electron microscopy measurements showed smaller grain sizes. This was also confirmed with an increase in the samples’ relative density implying the formation of nano-sized grains. Full electrical, thermal, and thermoelectric measurements were performed and comprehensively discussed in this report for all samples in the temperature range from room temperature (RT) to 570 K. The measurements demonstrated an enhancement for x = 0.35 wt% GTNPs at 540 K up to 43% in the power factor and 51% in the ZT compared to pristine Bi2Te3, which was attributed to the optimum grain size, the lower grain boundaries, and better electrical and thermal conductivity aroused from the precise addition of GTNPs. The best electrical conductivity of ~ 8.2 × 104 S/m and lowest thermal conductivity of ~ 1 W/m·K for the Bi2Te3-containing 0.35 wt% GTNPs at RT even though the sample with 0.5 wt% attained the highest Seebeck coefficient of 154 µV/T at 540 K. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Seascape ecology in the vicinity of a Blake Ridge cold seep

Author

Johnson, Kellie, primary, Taylor, Avery, additional, Socha, Annika, additional, Barkyoumb, Ellie, additional, Nakamura, Koichi, additional, Kaiser, Carl L., additional, German, Christopher R., additional, Yoerger, Dana R., additional, and Van Dover, Cindy Lee, additional

Published
2023
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36. Irreversibility from a Reversible Equation

Author

Ezawa, Hiroshi, Nakamura, Koichi, and Watanabe, Keiji

Subjects
Condensed Matter
Abstract

After a discussion on the state of local equilibrium with temperature inhomogeneity, comparing mixture state reprsentation in statistical mechanics and pure state representation in thermo field dynamics, a simple model is solved to show that a reversible equation of motion with the initial condition having inhomogeneous temperature can lead to irreversible, viz. diffusive, behaviour. Yet, the solution is time symmetric exhibiting diffusion both towards future and past., Comment: 8 pages, LaTeX

Published
1998

37. Evolution of a Bose-Einstein condensate of neutral atoms --- A field theoretical approach

Author

Nakamura, Koichi and Yamanaka, Yoshiya

Subjects
Condensed Matter
Abstract

The particle distribution in a Bose condensate under the trapping potential and its time evolution after switching off the trapping potential suddenly are calculated. We investigate the problem from the viewpoint of quantum field theory,using a model of self-interacting neutral boson field. Within the approximation of retainng the most dominant term in the Hamiltonian after applying the Bogoliubov replacement, we can calculate analytically the particle distribution as a function of space and time coordinates., Comment: 4 pages, LaTeX

Published
1998

44. Table S1 from A Potent Blood–Brain Barrier-Permeable Mutant IDH1 Inhibitor Suppresses the Growth of Glioblastoma with IDH1 Mutation in a Patient-Derived Orthotopic Xenograft Model

Author

Machida, Yukino, primary, Nakagawa, Makoto, primary, Matsunaga, Hironori, primary, Yamaguchi, Masayuki, primary, Ogawara, Yoko, primary, Shima, Yutaka, primary, Yamagata, Kazutsune, primary, Katsumoto, Takuo, primary, Hattori, Ayuna, primary, Itoh, Masato, primary, Seki, Takahiko, primary, Nishiya, Yumi, primary, Nakamura, Koichi, primary, Suzuki, Kanae, primary, Imaoka, Tomoki, primary, Baba, Daichi, primary, Suzuki, Makoto, primary, Sampetrean, Oltea, primary, Saya, Hideyuki, primary, Ichimura, Koichi, primary, and Kitabayashi, Issay, primary

Published
2023
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45. Figure S2 from A Potent Blood–Brain Barrier-Permeable Mutant IDH1 Inhibitor Suppresses the Growth of Glioblastoma with IDH1 Mutation in a Patient-Derived Orthotopic Xenograft Model

Author

Machida, Yukino, primary, Nakagawa, Makoto, primary, Matsunaga, Hironori, primary, Yamaguchi, Masayuki, primary, Ogawara, Yoko, primary, Shima, Yutaka, primary, Yamagata, Kazutsune, primary, Katsumoto, Takuo, primary, Hattori, Ayuna, primary, Itoh, Masato, primary, Seki, Takahiko, primary, Nishiya, Yumi, primary, Nakamura, Koichi, primary, Suzuki, Kanae, primary, Imaoka, Tomoki, primary, Baba, Daichi, primary, Suzuki, Makoto, primary, Sampetrean, Oltea, primary, Saya, Hideyuki, primary, Ichimura, Koichi, primary, and Kitabayashi, Issay, primary

Published
2023
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46. Data from A Potent Blood–Brain Barrier-Permeable Mutant IDH1 Inhibitor Suppresses the Growth of Glioblastoma with IDH1 Mutation in a Patient-Derived Orthotopic Xenograft Model

Author

Machida, Yukino, primary, Nakagawa, Makoto, primary, Matsunaga, Hironori, primary, Yamaguchi, Masayuki, primary, Ogawara, Yoko, primary, Shima, Yutaka, primary, Yamagata, Kazutsune, primary, Katsumoto, Takuo, primary, Hattori, Ayuna, primary, Itoh, Masato, primary, Seki, Takahiko, primary, Nishiya, Yumi, primary, Nakamura, Koichi, primary, Suzuki, Kanae, primary, Imaoka, Tomoki, primary, Baba, Daichi, primary, Suzuki, Makoto, primary, Sampetrean, Oltea, primary, Saya, Hideyuki, primary, Ichimura, Koichi, primary, and Kitabayashi, Issay, primary

Published
2023
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47. Supplementary Materials and Methods from A Potent Blood–Brain Barrier-Permeable Mutant IDH1 Inhibitor Suppresses the Growth of Glioblastoma with IDH1 Mutation in a Patient-Derived Orthotopic Xenograft Model

Author

Machida, Yukino, primary, Nakagawa, Makoto, primary, Matsunaga, Hironori, primary, Yamaguchi, Masayuki, primary, Ogawara, Yoko, primary, Shima, Yutaka, primary, Yamagata, Kazutsune, primary, Katsumoto, Takuo, primary, Hattori, Ayuna, primary, Itoh, Masato, primary, Seki, Takahiko, primary, Nishiya, Yumi, primary, Nakamura, Koichi, primary, Suzuki, Kanae, primary, Imaoka, Tomoki, primary, Baba, Daichi, primary, Suzuki, Makoto, primary, Sampetrean, Oltea, primary, Saya, Hideyuki, primary, Ichimura, Koichi, primary, and Kitabayashi, Issay, primary

Published
2023
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