Search

Your search keyword '"Inoue, Takato"' showing total 169 results
Start Over Author "Inoue, Takato"
169 results on '"Inoue, Takato"'

2. Hamiltonian Cycles for Finite Weyl Groupoids

Author

Inoue, Takato and Yamane, Hiroyuki

Subjects
Mathematics - Combinatorics, Mathematics - Quantum Algebra
Abstract

Let $\Gamma({\mathcal{W}})$ be the Cayley graph of a finite Weyl groupoid ${\mathcal{W}}$. In this paper, we show an existence of a Hamitonian cycle of $\Gamma({\mathcal{W}})$ for any ${\mathcal{W}}$. We exatctly draw a Hamiltonian cycle of $\Gamma({\mathcal{W}})$ for any (resp. some) irreducible ${\mathcal{W}}$ of rank three (resp. four). Moreover for the irreducible ${\mathcal{W}}$ of rank three, we give a second largest eigenvalue of the adjacency matrix of $\Gamma({\mathcal{W}})$, and know if $\Gamma({\mathcal{W}})$ is a bipartite Ramanujan graph or not., Comment: 38 pages, 6 figures, any comment is welcome

Published
2023

3. Femtosecond reduction of atomic scattering factors triggered by intense x-ray pulse

Author

Inoue, Ichiro, Yamada, Jumpei, Kapcia, Konrad J., Stransky, Michal, Tkachenko, Victor, Jurek, Zoltan, Inoue, Takato, Osaka, Taito, Inubushi, Yuichi, Ito, Atsuki, Tanaka, Yuto, Matsuyama, Satoshi, Yamauchi, Kazuto, Yabashi, Makina, and Ziaja, Beata

Subjects
Physics - Atomic Physics, Physics - Optics, Physics - Plasma Physics
Abstract

X-ray diffraction of silicon irradiated with tightly focused femtosecond x-ray pulses (photon energy: 11.5 keV, pulse duration: 6 fs) was measured at various x-ray intensities up to $4.6\times10^{19}$ W/cm$^2$. The measurement reveals that the diffraction intensity is highly suppressed when the x-ray intensity reaches of the order of $10^{19}$ W/cm$^2$. With a dedicated simulation, we confirm the observed reduction of the diffraction intensity is attributed to the femtosecond change in individual atomic scattering factors due to the ultrafast creation of highly ionized atoms through photoionization, Auger decay, and subsequent collisional ionization. We anticipate that this ultrafast reduction of atomic scattering factor will be a basis for new x-ray nonlinear techniques, such as pulse shortening and contrast variation x-ray scattering.

Published
2023
Full Text
View/download PDF

4. X-ray wavefront sensor development at the Advanced Light Source

Author

Goldberg, Kenneth A, Wojdyla, Antoine, Bryant, Diane, Shi, Xianbo, Rebuffi, Luca, Frith, Matthew, Highland, Matthew, Assoufid, Lahsen, Ichii, Yoshio, Inoue, Takato, and Yamauchi, Kazuto

Subjects
Engineering, Electronics, Sensors and Digital Hardware, Communications engineering, Electronics, sensors and digital hardware, Atomic, molecular and optical physics
Abstract

At Lawrence Berkeley National Laboratory's Advanced Light Source, we are developing x-ray wavefront sensors to support the creation and operation of beamlines with diffraction-limited quality. Our new approach to rapid, intermittent wavefront sensing operates in reflection at glancing incidence angles and is compatible with the high-power densities of modern beamlines. For soft x-ray applications especially, the wavefront sensor can operate upstream of the exit slit in a vertically dispersed beam. This single-shot technique supports lateral shearing interferometry and Hartmann wavefront sensing; it can be adapted to speckle-based techniques as well. The reflected beam is directed to an off-axis YAG crystal that produces scintillated visible light. A small mirror reflects the light to a microscope and camera, and the measured wavefront shape information can be used as feedback to adaptive x-ray mirror elements. A compact array of gratings enables measurement across a broad range of photon energies or wavefront curvatures. We describe recent demonstrations at soft x-ray and hard x-ray wavelengths measuring an adaptive x-ray mirror, and a toroidal focusing mirror.

Published
2023

11. Dramatic dietary shift maintains sequestered toxins in chemically defended snakes

Author

Yoshida, Tatsuya, Ujiie, Rinako, Savitzky, Alan H., Jono, Teppei, Inoue, Takato, Yoshinaga, Naoko, Aburaya, Shunsuke, Aoki, Wataru, Takeuchi, Hirohiko, Ding, Li, Chen, Qin, Cao, Chengquan, Tsai, Tein-Shun, de Silva, Anslem, Mahaulpatha, Dharshani, Nguyen, Tao Thien, Tang, Yezhong, Mori, Naoki, and Mori, Akira

Published
2020

12. Extreme focusing of hard X-ray free-electron laser pulses enables 7 nm focus width and 1022 W cm−2 intensity.

Author

Yamada, Jumpei, Matsuyama, Satoshi, Inoue, Ichiro, Osaka, Taito, Inoue, Takato, Nakamura, Nami, Tanaka, Yuto, Inubushi, Yuichi, Yabuuchi, Toshinori, Tono, Kensuke, Tamasaku, Kenji, Yumoto, Hirokatsu, Koyama, Takahisa, Ohashi, Haruhiko, Yabashi, Makina, and Yamauchi, Kazuto

Abstract

By illuminating matter with bright and intense light, researchers gain insights into material composition and properties. In the regime of extremely short wavelengths, X-ray free-electron lasers (XFELs) with exceptional peak brilliance have unveiled crucial details about the structures, dynamics and physics of various materials. Although X-ray focusing optics to enhance the intensity have progressed, achieving a single-nanometre focal spot that fully exploits the source performance remains elusive. Aberrations arising from reflective optical schemes noticeably degrade the focal spot, even in the presence of inevitably slight angular transition and pointing errors. Here we present an approach that directly forms a source image in an extremely small focal spot, achieving 7 nm focusing, in both transverse dimensions, of 9.1 keV XFELs with the extremely high intensity of 1.45 × 1022 W cm−2. This was made possible by a scheme combining concave and convex X-ray mirrors with suppressed aberrations and high angular tolerances. The attained highly intense X-rays, surpassing the previous intensity by a hundred-fold, induced the vigorous ionization of chromium, suggesting the creation of solid-density heavy bare atomic nuclei. Our results, which demonstrate the realization of stable ultraintense XFEL beams by forming demagnified source images, hold immediate significance to a wide range of research fields, including atomic, molecular and optical physics and high-energy-density sciences. Researchers focused hard X-rays from a free-electron laser down to transverse dimensions of ~7 nm × 7 nm, enabling a two-order increase in intensity of photons and yielding access to the elusive 1022 W cm−2 regime. Such intense, short-wavelength electromagnetic radiation may probe atomic, molecular and optical physics with extremely high resolution. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

16. Ultimate condensation of hard X-ray free-electron laser reaching single-nanometre focus size and 1022 W/cm2 intensity

Author

Yamada, Jumpei, primary, Matsuyama, Satoshi, additional, Inoue, Ichiro, additional, Osaka, Taito, additional, Inoue, Takato, additional, Nakamura, Nami, additional, Tanaka, Yuto, additional, Inubushi, Yuichi, additional, Yabuuchi, Toshinori, additional, Tono, Kensuke, additional, Tamasaku, Kenji, additional, Yumoto, Hirokatsu, additional, Koyama, Takahisa, additional, Ohashi, Haruhiko, additional, Yabashi, Makina, additional, and Yamauchi, Kazuto, additional

Published
2023
Full Text
View/download PDF

17. Femtosecond Reduction of Atomic Scattering Factors Triggered by Intense X-Ray Pulse

Author

Inoue, Ichiro, primary, Yamada, Jumpei, additional, Kapcia, Konrad J., additional, Stransky, Michal, additional, Tkachenko, Victor, additional, Jurek, Zoltan, additional, Inoue, Takato, additional, Osaka, Taito, additional, Inubushi, Yuichi, additional, Ito, Atsuki, additional, Tanaka, Yuto, additional, Matsuyama, Satoshi, additional, Yamauchi, Kazuto, additional, Yabashi, Makina, additional, and Ziaja, Beata, additional

Published
2023
Full Text
View/download PDF

18. Fabrication and LTP test result for a 460 mm long deformable mirror to reduce “junction effect”

Author

Ichii, Yoshio, primary, Inoue, Takato, additional, Tramae, Fumiharu, additional, Shiroma, Shinsaku, additional, Aono, Shinya, additional, Shi, Xianbo, additional, Qian, Jun, additional, Rebuffi, Luca, additional, Sonoyama, Juniki, additional, Takenaka, Hisataka, additional, Matsuyama, Satoshi, additional, Assoufid, Lahsen, additional, and Yamauchi, Kazuto, additional

Published
2023
Full Text
View/download PDF

19. X-ray wavefront sensor development at the Advanced Light Source

Author

Goldberg, Kenneth A., primary, Wojdyla, Antoine, additional, Bryant, Diane, additional, Shi, Xianbo, additional, Rebuffi, Luca, additional, Frith, Matthew, additional, Highland, Matthew, additional, Assoufid, Lahsen, additional, Ichii, Yoshio, additional, Inoue, Takato, additional, and Yamauchi, Kazuto, additional

Published
2023
Full Text
View/download PDF

23. Episode 3

Author

ICHII, Yoshio, primary, SHIROMA, Shinsaku, additional, NAKAMORI, Hiroki, additional, INOUE, Takato, additional, and MATSUYAMA, Satoshi, additional

Published
2023
Full Text
View/download PDF

25. Wide field-of-view x-ray imaging optical system using grazing-incidence mirrors

Author

Matsuyama, Satoshi, Inoue, Takato, Hata, Kentaro, Iriyama, Haruhito, Yamauchi, Kazuto, Matsuyama, Satoshi, Inoue, Takato, Hata, Kentaro, Iriyama, Haruhito, and Yamauchi, Kazuto

Abstract

A field-curvature-corrected imaging optical system for x-ray microscopy using only grazing-incidence mirrors is proposed. It combines a Wolter type I (WO1) mirror pair, which forms a real image, with field curvature correction (FCC) optics—a convex hyperbolic mirror pair—that form a virtual image; compensation of the field curvatures realizes a wide field-of-view (FOV) and high magnification. Ray-tracing and wave-optics simulations verified the efficacy of the design, for which a FOV width was 111 µm—4.7 times larger than that for the uncorrected WO1 design. The addition of FCC optics also produced a 2.3-fold increase in magnification.

Published
2023

26. Extreme focusing of hard X-ray free-electron laser pulses enables 7 nm focus width and 1022W cm−2intensity

Author

Yamada, Jumpei, Matsuyama, Satoshi, Inoue, Ichiro, Osaka, Taito, Inoue, Takato, Nakamura, Nami, Tanaka, Yuto, Inubushi, Yuichi, Yabuuchi, Toshinori, Tono, Kensuke, Tamasaku, Kenji, Yumoto, Hirokatsu, Koyama, Takahisa, Ohashi, Haruhiko, Yabashi, Makina, and Yamauchi, Kazuto

Abstract

By illuminating matter with bright and intense light, researchers gain insights into material composition and properties. In the regime of extremely short wavelengths, X-ray free-electron lasers (XFELs) with exceptional peak brilliance have unveiled crucial details about the structures, dynamics and physics of various materials. Although X-ray focusing optics to enhance the intensity have progressed, achieving a single-nanometre focal spot that fully exploits the source performance remains elusive. Aberrations arising from reflective optical schemes noticeably degrade the focal spot, even in the presence of inevitably slight angular transition and pointing errors. Here we present an approach that directly forms a source image in an extremely small focal spot, achieving 7 nm focusing, in both transverse dimensions, of 9.1 keV XFELs with the extremely high intensity of 1.45 × 1022W cm−2. This was made possible by a scheme combining concave and convex X-ray mirrors with suppressed aberrations and high angular tolerances. The attained highly intense X-rays, surpassing the previous intensity by a hundred-fold, induced the vigorous ionization of chromium, suggesting the creation of solid-density heavy bare atomic nuclei. Our results, which demonstrate the realization of stable ultraintense XFEL beams by forming demagnified source images, hold immediate significance to a wide range of research fields, including atomic, molecular and optical physics and high-energy-density sciences.

Published
2024
Full Text
View/download PDF

27. Anti-proliferating and apoptosis-inducing activity of chemical compound FTI-6D in association with p53 in human cancer cell lines

Author

Inoue, Takato, primary, Matsuda, Kazuaki, additional, Matsusaka, Keisuke, additional, Nakajima, Masaya, additional, Takeno, Yukari, additional, Miyazaki, Toko, additional, Shintaku, Takahiko, additional, Yoda, Natsumi, additional, Saito, Takahiko, additional, Ikeda, Eriko, additional, Mano, Yasunobu, additional, Shinohara, Kenichi, additional, Rahmutulla, Bahityar, additional, Fukuyo, Masaki, additional, Kita, Kazuko, additional, Nemoto, Tetsuhiro, additional, and Kaneda, Atsushi, additional

Published
2023
Full Text
View/download PDF

35. A box-shaped shielding device for reducing the risk of COVID-19 droplet infection during gastrointestinal endoscopic procedures

Author

Kawabata, Hideaki, Okazaki, Yuji, Watanabe, Kazuhisa, Inoue, Takato, Yamaguchi, Katsutoshi, Ueda, Yuki, Hitomi, Misuzu, Miyata, Masatoshi, and Motoi, Shigehiro

Subjects
cholangiopancreatography, Technical Report, shielding box, COVID-19, infection prevention, gastrointestinal endoscopy, endoscopic retrograde
Abstract

Background and Aims: Endoscopists and endoscopic assistants are easily exposed to germs, including COVID-19, during aerosol-generating procedures such as gastrointestinal endoscopy. This retrospective study investigated the utility of a box-shaped shielding device for reducing the risk of COVID-19 droplet infection during endoscopic procedures. Methods: We created a cuboid box (500 × 650 × 450 mm) with four sides were covered with a transparent, vinyl-chloride sheet having two windows for endoscopic passage and assistance. The shielding box was then placed over a patient’s head and shoulders and covered with another transparent vinyl sheet. We assessed its utility and safety using the medical data concerning the procedure time and vital signs and a questionnaire for the endoscopic staff and patients. Results: We performed endoscopic retrograde cholangiopancreatography-related procedures using this device for two patients suspected of having COVID-19-associated pneumonia. Both patients were smoothly and successfully treated without any complications. No difficulties were noted with either endoscopic operation or in assisting the procedure, and the transparency was good enough to observe the patients’ faces and movements. Conclusions: This box-shaped shielding device can be used to reduce the risk of COVID-19 droplet infection during endoscopic procedures in the clinical setting. Relevance for patients: The COVID-19 outbreak has reminded healthcare personnel working in endoscopy units of the importance of infection prevention during endoscopy. The box-shaped shielding device can help endoscopic staff avoid hospital-setting COVID-19 infection.

Published
2020

37. Erratum: “Optimal deformation procedure for hybrid adaptive x-ray mirror based on mechanical and piezo-driven bending system” [Rev. Sci. Instrum. 92, 123706 (2021)]

Author

Inoue, Takato, primary, Nishioka, Yuka, additional, Matsuyama, Satoshi, additional, Sonoyama, Junki, additional, Akiyama, Kazuteru, additional, Nakamori, Hiroki, additional, Ichii, Yoshio, additional, Sano, Yasuhisa, additional, Shi, Xianbo, additional, Shu, Deming, additional, Wyman, Max D., additional, Harder, Ross, additional, Kohmura, Yoshiki, additional, Yabashi, Makina, additional, Assoufid, Lahsen, additional, Ishikawa, Tetsuya, additional, and Yamauchi, Kazuto, additional

Published
2022
Full Text
View/download PDF

40. Optimal deformation procedure for hybrid adaptive x-ray mirror based on mechanical and piezo-driven bending system

Author

Inoue, Takato, primary, Nishioka, Yuka, additional, Matsuyama, Satoshi, additional, Sonoyama, Junki, additional, Akiyama, Kazuteru, additional, Nakamori, Hiroki, additional, Ichii, Yoshio, additional, Sano, Yasuhisa, additional, Shi, Xianbo, additional, Shu, Deming, additional, Wyman, Max D., additional, Harder, Ross, additional, Kohmura, Yoshiki, additional, Yabashi, Makina, additional, Assoufid, Lahsen, additional, Ishikawa, Tetsuya, additional, and Yamauchi, Kazuto, additional

Published
2021
Full Text
View/download PDF

41. Formation Mechanism and Toxicological Significance of Biogenic Mercury Selenide Nanoparticles in Human Hepatoma HepG2 Cells

Author

Tanaka, Yu-ki, primary, Usuzawa, Hana, additional, Yoshida, Miyu, additional, Kumagai, Kazuhiro, additional, Kobayashi, Keita, additional, Matsuyama, Satoshi, additional, Inoue, Takato, additional, Matsunaga, Akihiro, additional, Shimura, Mari, additional, Ruiz Encinar, Jorge, additional, Costa-Fernández, José M., additional, Fukumoto, Yasunori, additional, Suzuki, Noriyuki, additional, and Ogra, Yasumitsu, additional

Published
2021
Full Text
View/download PDF

42. Do predators prefer toxic animals? A case of chemical discrimination by an Asian snake that sequesters firefly toxins.

Author

Fukuda, Masaya, Ujiie, Rinako, Inoue, Takato, Chen, Qin, Cao, Chengquan, Ding, Li, Mori, Naoki, and Mori, Akira

Subjects
POISONS, FIREFLIES, TOXINS, PREDATORY animals, SNAKES, TOADS
Abstract

Several Asian natricine snakes of the genus Rhabdophis feed on toads and sequester steroidal cardiac toxins known as bufadienolides (BDs) from them. A recent study revealed that species of the Rhabdophis nuchalis Group ingest lampyrine fireflies to sequester BDs. Although several species of fireflies are distributed in the habitat of the R. nuchalis Group, only lampyrine fireflies, which have BDs, are included in the diet of these snakes. Thus, we hypothesized that the R. nuchalis Group chemically distinguishes fireflies that have BDs from those that do not have BDs. We also predicted that the R. nuchalis Group detects BDs as the chemical cue of toxin source. To test these predictions, we conducted 3 behavioral experiments using Rhabdophis chiwen , which belongs to the R. nuchalis Group. In the first experiment, R. chiwen showed a moderate tongue flicking response to cinobufagin, a compound of BDs. On the other hand, the snake showed a higher response to the chemical stimuli of lampyrine fireflies (BD fireflies) than those of lucioline fireflies (non-BD fireflies). In the second experiment, in which we provided live BD and non-BD fireflies, the snake voluntarily consumed only the former. In the third, a Y-maze experiment, the snake tended to select the chemical trail of BD fireflies more frequently than that of non-BD fireflies. These results demonstrated that R. chiwen discriminates BD fireflies from non-BD fireflies, but the prediction that BDs are involved in this discrimination was not fully supported. To identify the proximate mechanisms of the recognition of novel toxic prey in the R. nuchalis Group, further investigation is necessary. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

44. Optimization of mirror deformation strategy using mechanical and piezoelectric bending system

Author

Inoue, Takato, primary, Nishioka, Yuka, additional, Matsuyama, Satoshi, additional, Sonoyama, Junki, additional, Akiyama, Kazuteru, additional, Nakamori, Hiroki, additional, Sano, Yasuhisa, additional, Kohmura, Yoshiki, additional, Yabashi, Makina, additional, Ishikawa, Tetsuya, additional, Assoufid, Lahsen, additional, and Yamauchi, Kazuto, additional

Published
2021
Full Text
View/download PDF

45. Image-based wavefront measurement for full-field x-ray microscopy

Author

Tanaka, Yuto, primary, Matsuyama, Satoshi, additional, Inoue, Takato, additional, Nakamura, Nami, additional, Yamada, Jumpei, additional, Kohmura, Yoshiki, additional, Yabashi, Makina, additional, Omote, Kazuhiko, additional, Ishikawa, Tetsuya, additional, and Yamauchi, Kazuto, additional

Published
2021
Full Text
View/download PDF

47. Hard X-ray nanoprobe scanner

Author

Yamada, Jumpei, primary, Inoue, Ichiro, additional, Osaka, Taito, additional, Inoue, Takato, additional, Matsuyama, Satoshi, additional, Yamauchi, Kazuto, additional, and Yabashi, Makina, additional

Published
2021
Full Text
View/download PDF

50. PhoENiXに向けた高精度軟Ｘ線Wolterミラー開発研究の現状

Author

SAKAO, Taro, MATSUYAMA, Satoshi, INOUE, Takato, HATA, Kentaro, HAGIWARA, Taku, NAKAMURA, Nami, NISHIOKA, Yuka, TANAKA, Yuto, YAMAUCHI, Kazuto, YAMADA, Jumpei, KOHMURA, Yoshiki, SUEMATSU, Yoshinori, and NARUKAGE, Noriyuki

Abstract

第21回宇宙科学シンポジウム (2021年1月6日-7日. オンライン開催), 21st Space Science Symposium (January 6-7, 2021. Online Meeting), 著者人数: 13名, 資料番号: SA6000163050, レポート番号: g03-03

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results