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2. Search for High-Pressure Silicon Phases: Reaching the Extreme Conditions with High-Intensity Laser Irradiation

Author

Rapp, Ludovic, Matsuoka, Takeshi, Firestein, Konstantin L., Sagae, Daisuke, Habara, Hideaki, Mukai, Keiichiro, Tanaka, Kazuo A., Gamaly, Eugene, Kodama, Ryosuke, Seto, Yusuke, Shobu, Takahisa, Tominaga, Aki, Smillie, Lachlan, Haberl, Bianca, Pikuz, Tatiana, Yabuuchi, Toshinori, Togashi, Tadashi, Inubushi, Yuichi, Yabashi, Makina, Juodkazis, Saulius, Golberg, Dmitri V., Rode, Andrei V., Ozaki, Norimasa, Lotsch, H.K.V., Founding Editor, Rhodes, William T., Editor-in-Chief, Adibi, Ali, Series Editor, Asakura, Toshimitsu, Series Editor, Hänsch, Theodor W., Series Editor, Krausz, Ferenc, Series Editor, Masters, Barry R., Series Editor, Midorikawa, Katsumi, Series Editor, Venghaus, Herbert, Series Editor, Weber, Horst, Series Editor, Weinfurter, Harald, Series Editor, Kobayashi, Kazuya, Series Editor, Markel, Vadim, Series Editor, Stoian, Razvan, editor, and Bonse, Jörn, editor

Published
2023
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4. Nanoscale subsurface dynamics of solids upon high-intensity laser irradiation observed by femtosecond grazing-incidence x-ray scattering

Author

Randolph, Lisa, Banjafar, Mohammadreza, Preston, Thomas R., Yabuuchi, Toshinori, Makita, Mikako, Dover, Nicholas P., Rödel, Christian, Göde, Sebastian, Inubushi, Yuichi, Jakob, Gerhard, Kaa, Johannes, Kon, Akira, Koga, James K., Ksenzov, Dmitriy, Matsuoka, Takeshi, Nishiuchi, Mamiko, Paulus, Michael, Schon, Frederic, Sueda, Keiichi, Sentoku, Yasuhiko, Togashi, Tadashi, Vafaee-Khanjani, Mehran, Bussmann, Michael, Cowan, Thomas E., Kläui, Mathias, Fortmann-Grote, Carsten, Huang, Lingen, Mancuso, Adrian P., Kluge, Thomas, Gutt, Christian, and Nakatsutsumi, Motoaki

Subjects
Physics - Plasma Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Observing ultrafast laser-induced structural changes in nanoscale systems is essential for understanding the dynamics of intense light-matter interactions. For laser intensities on the order of $10^{14} \, \rm W/cm^2$, highly-collisional plasmas are generated at and below the surface. Subsequent transport processes such as heat conduction, electron-ion thermalization, surface ablation and resolidification occur at picosecond and nanosecond time scales. Imaging methods, e.g. using x-ray free-electron lasers (XFEL), were hitherto unable to measure the depth-resolved subsurface dynamics of laser-solid interactions with appropriate temporal and spatial resolution. Here we demonstrate picosecond grazing-incidence small-angle x-ray scattering (GISAXS) from laser-produced plasmas using XFEL pulses. Using multi-layer (ML) samples, both the surface ablation and subsurface density dynamics are measured with nanometer depth resolution. Our experimental data challenges the state-of-the-art modeling of matter under extreme conditions and opens new perspectives for laser material processing and high-energy-density science., Comment: 16 pages, 4 figures. This is the version of the article before peer review, as submitted by authors. There is a Supplementary Information file in the Ancillary files directory

Published
2020

5. X-ray free electron laser observation of ultrafast lattice behaviour under femtosecond laser-driven shock compression in iron

Author

Sano, Tomokazu, Matsuda, Tomoki, Hirose, Akio, Ohata, Mitsuru, Terai, Tomoyuki, Kakeshita, Tomoyuki, Inubushi, Yuichi, Sato, Takahiro, Miyanishi, Kohei, Yabashi, Makina, Togashi, Tadashi, Tono, Kensuke, Sakata, Osami, Tange, Yoshinori, Arakawa, Kazuto, Ito, Yusuke, Okuchi, Takuo, Sato, Tomoko, Sekine, Toshimori, Mashimo, Tsutomu, Nakanii, Nobuhiko, Seto, Yusuke, Shigeta, Masaya, Shobu, Takahisa, Sano, Yuji, Hosokai, Tomonao, Matsuoka, Takeshi, Yabuuchi, Toshinori, Tanaka, Kazuo A., Ozaki, Norimasa, and Kodama, Ryosuke

Published
2023
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8. Expert teleconsultation involving patients and their primary neurologists for the management of multiple sclerosis in regions without specialists.

Author

Miyazaki, Yusei, Ura, Shigehisa, Horiuchi, Kazuhiro, Matsuoka, Takeshi, Houzen, Hideki, Tsuzaka, Kazufumi, Makino, Yuichi, Koshida, Manami, Oyama, Genko, Sato, Chika, Naganuma, Ryoji, Amino, Itaru, Akimoto, Sachiko, Niino, Masaaki, Minami, Naoya, Takahashi, Eri, Ota, Susumu, Hattori, Nobutaka, Yabe, Ichiro, and Kikuchi, Seiji

Abstract

Objective: This study aimed to describe the usefulness of our teleconsultation system for managing multiple sclerosis (MS) in regions without specialists. Methods: A cross‐sectional questionnaire survey involving 11 MS patients and their primary neurologists was carried out between May and December 2023. Real‐time video conferences were conducted between an MS specialist at a hub hospital and patients with their primary neurologists at one of the four regional core hospitals in Hokkaido, Japan. Patients and their primary neurologists completed questionnaires to evaluate the usefulness of the teleconsultation system. Results: The patients and their primary neurologists were generally satisfied with the teleconsultations and expressed willingness to continue using the system. In particular, alleviating the burden of visiting distant MS‐specialized clinics was highly appreciated by patients. In addition, patients gave high scores for questions regarding increased satisfaction with the primary neurologists' care and the treatments they offered. The primary neurologists thought the system enhanced their knowledge of MS management. However, they did not think that the system could ease their burden for managing MS patients because of challenges in time allocation and scheduling for teleconsultation sessions. Conclusions: The present study suggested that our expert teleconsultation system for MS reduces the burden on patients of visiting distant MS‐specialized clinics, and enhances knowledge of MS management for the primary neurologists. It also promotes trust between patients and their primary neurologists, and taken together, these aspects could collectively lead to independent and sustainable MS management in regions without MS specialists. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Observation of high-pressure polymorphs in bulk silicon formed at relativistic laser intensities

Author

Rapp, Ludovic, primary, Matsuoka, Takeshi, additional, Firestein, Konstantin L., additional, Sagae, Daisuke, additional, Habara, Hideaki, additional, Mukai, Keiichiro, additional, Tanaka, Kazuo A., additional, Gamaly, Eugene G., additional, Kodama, Ryosuke, additional, Seto, Yusuke, additional, Shobu, Takahisa, additional, Tominaga, Aki, additional, Smillie, Lachlan, additional, Pikuz, Tatiana, additional, Haberl, Bianca, additional, Yabuuchi, Toshinori, additional, Togashi, Tadashi, additional, Inubushi, Yuichi, additional, Yabashi, Makina, additional, Juodkazis, Saulius, additional, Golberg, Dmitri V., additional, Rode, Andrei V., additional, and Ozaki, Norimasa, additional

Published
2024
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15. Ultrafast olivine-ringwoodite transformation during shock compression

Author

Okuchi, Takuo, Seto, Yusuke, Tomioka, Naotaka, Matsuoka, Takeshi, Albertazzi, Bruno, Hartley, Nicholas J., Inubushi, Yuichi, Katagiri, Kento, Kodama, Ryosuke, Pikuz, Tatiana A., Purevjav, Narangoo, Miyanishi, Kohei, Sato, Tomoko, Sekine, Toshimori, Sueda, Keiichi, Tanaka, Kazuo A., Tange, Yoshinori, Togashi, Tadashi, Umeda, Yuhei, Yabuuchi, Toshinori, Yabashi, Makina, and Ozaki, Norimasa

Published
2021
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16. Generation of GeV protons from 1 PW laser interaction with near critical density targets

Author

Bulanov, Stepan S., Bychenkov, Valery Yu., Chvykov, Vladimir, Kalinchenko, Galina, Litzenberg, Dale William, Matsuoka, Takeshi, Thomas, Alexander G. R., Willingale, Louise, Yanovsky, Victor, Krushelnick, Karl, and Maksimchuk, Anatoly

Subjects
Physics - Plasma Physics
Abstract

The propagation of ultra intense laser pulses through matter is connected with the generation of strong moving magnetic fields in the propagation channel as well as the formation of a thin ion filament along the axis of the channel. Upon exiting the plasma the magnetic field displaces the electrons at the back of the target, generating a quasistatic electric field that accelerates and collimates ions from the filament. Two-dimensional Particle-in-Cell simulations show that a 1 PW laser pulse tightly focused on a near-critical density target is able to accelerate protons up to an energy of 1.3 GeV. Scaling laws and optimal conditions for proton acceleration are established considering the energy depletion of the laser pulse., Comment: 26 pages, 8 figures

Published
2009
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18. Accelerating Protons to Therapeutic Energies with Ultra-Intense Ultra-Clean and Ultra-Short Laser Pulses

Author

Bulanov, Stepan S., Brantov, Andrei, Bychenkov, Valery Yu., Chvykov, Vladimir, Kalinchenko, Galina, Matsuoka, Takeshi, Rousseau, Pascal, Reed, Stephen, Yanovsky, Victor, Krushelnick, Karl, Litzenberg, Dale William, and Maksimchuk, Anatoly

Subjects
Physics - Plasma Physics, Physics - Medical Physics
Abstract

Proton acceleration by high-intensity laser pulses from ultra-thin foils for hadron therapy is discussed. With the improvement of the laser intensity contrast ratio to 10-11 achieved on Hercules laser at the University of Michigan, it became possible to attain laser-solid interactions at intensities up to 1022 W/cm2 that allows an efficient regime of laser-driven ion acceleration from submicron foils. Particle-In-Cell (PIC) computer simulations of proton acceleration in the Directed Coulomb explosion regime from ultra-thin double-layer (heavy ions / light ions) foils of different thicknesses were performed under the anticipated experimental conditions for Hercules laser with pulse energies from 3 to 15 J, pulse duration of 30 fs at full width half maximum (FWHM), focused to a spot size of 0.8 microns (FWHM). In this regime heavy ions expand predominantly in the direction of laser pulse propagation enhancing the longitudinal charge separation electric field that accelerates light ions. The dependence of the maximum proton energy on the foil thickness has been found and the laser pulse characteristics have been matched with the thickness of the target to ensure the most efficient acceleration. Moreover the proton spectrum demonstrates a peaked structure at high energies, which is required for radiation therapy. 2D PIC simulations show that a 150-500 TW laser pulse is able to accelerate protons up to 100-220 MeV energies., Comment: 26 pages, 6 figures

Published
2008
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23. Current Status of Antimicrobial Drug Use in Japanese Companion Animal Clinics and the Factors Associated With Their Use

Author

Makita, Kohei, Sugahara, Nami, Nakamura, Kazuhiro, Matsuoka, Takeshi, Sakai, Masato, Tamura, Yutaka, Makita, Kohei, Sugahara, Nami, Nakamura, Kazuhiro, Matsuoka, Takeshi, Sakai, Masato, and Tamura, Yutaka

Abstract

type:Article, The Japanese National Action Plan on Antimicrobial Resistance (AMR) was adopted to strengthen AMR surveillance and monitoring in companion animals. The Japanese Veterinary Antimicrobial Resistance Monitoring (JVARM) system monitors the sale of veterinary antimicrobial drugs by pharmaceutical companies, and the sale of human drugs by principal wholesale companies to companion animal (dogs and cats) clinics. However, the data do not include sales by local drug suppliers and personal importation to companion animal clinics in Japan. The purposes of this study were to estimate total antimicrobial drug use by companion animal clinics in Japan and to identify the factors associated with their use. In 2018, questionnaires gathering data on attributes of the clinic and volumes of antimicrobial drugs used were sent to 212 clinics across Japan by the Japan Veterinary Medical Association. Out of the clinics, 170 valid questionnaires were returned (80.2% response rate). Antimicrobial drugs were categorized first as human, veterinary, or imported drugs and then further categorized as important drugs (critically important drugs for humans and second-choice veterinary drugs) or others. Total antimicrobial drug use was estimated based on the number of clinics reported in 2016. The relationships between antimicrobial drug use and various questionnaire items were analyzed using non-parametric regression analysis. Total antimicrobial drug use was estimated at 29.9t, which was 2.1 times higher than reported by the JVARM survey on the sales of antimicrobial drugs. In terms of total use, important drugs and human drugs accounted for 12.6 and 61.8%, respectively. Clinic income per veterinarian was associated with total antimicrobial use per veterinarian. The proportion of important drugs among all antimicrobial drugs used in a clinic was high in recently established clinics with middle-aged and older directors.

Published
2023

30. A practically designed acoustic metamaterial sheet with two-dimensional connection of local resonators for sound insulation applications.

Author

Nakayama, Masanari, Matsuoka, Takeshi, Saito, Yuya, Uchida, Naoyuki, Inoue, Kazuma, Mitani, Hiroshi, Akasaka, Shuichi, and Koga, Shogo

Subjects
*SOUND design, *ACOUSTIC field, *RESONATORS, *FINITE element method, *SOUNDPROOFING, *ACOUSTICS
Abstract

A novel practical design of sheet-like acoustic metamaterials is described, which comprise a two-dimensional array of mutually connected cylindrical stubs with embedded metallic weights that can be processed with a simple integral molding. We investigate the elastic wave band dispersion of the acoustic metamaterial sheets to design the connected structure of the stubs so that each stub can work as spring–mass local resonators to open the out-of-plane acoustic bandgaps. For properly integrated materials, remarkable noise insulation performance over the mass law at the resonant frequencies is experimentally demonstrated. The sound insulation mechanism is numerically analyzed in association with the sound fields, the vibrational fields, and the dynamic effective mass using the finite element method by coupling the structures with acoustics. Furthermore, we show that the insulation frequency is tunable over a wide range of frequency by designing the physical and structural parameters of the resonator. The practically designed acoustic metamaterial sheets will pave the way for industrial use of acoustic metamaterials as advanced lightweight and compact sound insulators that can be tailored to meet individual needs on problems related to noise. [ABSTRACT FROM AUTHOR]

Published
2021
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31. High-pressure polymorphs in bulk silicon formed at relativistic laser intensity

Author

Rode, Andrei, primary, Rapp, Ludovic, additional, Matsuoka, Takeshi, additional, Firestein, Konstantin, additional, Sagae, Daisuke, additional, Habara, Hideaki, additional, Mukai, Keiichiro, additional, Tanaka, Kazuo, additional, Gamaly, Eugene, additional, Kodama, Ryosuke, additional, Seto, Yusuke, additional, Shobu, Takahisa, additional, Tominaga, Aki, additional, Smillie, Lachlan, additional, Pikuz, Tatiana, additional, Haberl, Bianca, additional, Yabuuchi, Toshinori, additional, Togashi, Tadashi Togashi Tadashi, additional, Inubushi, Yuichi, additional, Yabashi, Makina, additional, Juodkazis, Saulius, additional, Golberg, Dmitri, additional, and Ozaki, Norimasa, additional

Published
2022
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34. Nanoscale subsurface dynamics of solids upon high-intensity femtosecond laser irradiation observed by grazing-incidence x-ray scattering

Author

Randolph, Lisa, primary, Banjafar, Mohammadreza, additional, Preston, Thomas R., additional, Yabuuchi, Toshinori, additional, Makita, Mikako, additional, Dover, Nicholas P., additional, Rödel, Christian, additional, Göde, Sebastian, additional, Inubushi, Yuichi, additional, Jakob, Gerhard, additional, Kaa, Johannes, additional, Kon, Akira, additional, Koga, James K., additional, Ksenzov, Dmitriy, additional, Matsuoka, Takeshi, additional, Nishiuchi, Mamiko, additional, Paulus, Michael, additional, Schon, Frederic, additional, Sueda, Keiichi, additional, Sentoku, Yasuhiko, additional, Togashi, Tadashi, additional, Bussmann, Michael, additional, Cowan, Thomas E., additional, Kläui, Mathias, additional, Fortmann-Grote, Carsten, additional, Huang, Lingen, additional, Mancuso, Adrian P., additional, Kluge, Thomas, additional, Gutt, Christian, additional, and Nakatsutsumi, Motoaki, additional

Published
2022
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38. Self-localization Method Using Two Landmarks and Dead Reckoning for Autonomous Mobile Soccer Robots

Author

Motomura, Akira, Matsuoka, Takeshi, Hasegawa, Tsutomu, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Polani, Daniel, editor, Browning, Brett, editor, Bonarini, Andrea, editor, and Yoshida, Kazuo, editor

Published
2004
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39. Fusion

Author

Matsuoka, Takeshi, Yamamoto, Motoji, Ushimi, Nobuhiro, Inoue, Jyun’ichi, Sugimoto, Takuya, Araoka, Manabu, Kiriki, Toshihiro, Yamaguchi, Yuuki, Hasegawa, Tsutomu, Mohri, Akira, Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Birk, Andreas, editor, Coradeschi, Silvia, editor, and Tadokoro, Satoshi, editor

Published
2002
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40. On-line Navigation of Mobile Robot Among Moving Obstacles Using Ultrasonic Sensors

Author

Ushimi, Nobuhiro, Yamamoto, Motoji, Inoue, Jyun’ichi, Sugimoto, Takuya, Araoka, Manabu, Matsuoka, Takeshi, Kiriki, Toshihiro, Yamaguchi, Yuuki, Hasegawa, Tsutomu, Mohri, Akira, Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Birk, Andreas, editor, Coradeschi, Silvia, editor, and Tadokoro, Satoshi, editor

Published
2002
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41. Localization and Obstacles Detection Using Omni-directional Vertical Stereo Vision

Author

Matsuoka, Takeshi, Araoka, Manabu, Hasegawa, Tsutomu, Mohri, Akira, Yamamoto, Motoji, Kiriki, Toshihiro, Ushimi, Nobuhiro, Sugimoto, Takuya, Inoue, Jyun’ichi, Yamaguchi, Yuuki, Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Birk, Andreas, editor, Coradeschi, Silvia, editor, and Tadokoro, Satoshi, editor

Published
2002
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49. Ultrafast olivine-ringwoodite transformation during shock compression

Author

40303599, 90815705, Okuchi, Takuo, Seto, Yusuke, Tomioka, Naotaka, Matsuoka, Takeshi, Albertazzi, Bruno, Hartley, Nicholas J., Inubushi, Yuichi, Katagiri, Kento, Kodama, Ryosuke, Pikuz, Tatiana A., Purevjav, Narangoo, Miyanishi, Kohei, Sato, Tomoko, Sekine, Toshimori, Sueda, Keiichi, Tanaka, Kazuo A., Tange, Yoshinori, Togashi, Tadashi, Umeda, Yuhei, Yabuuchi, Toshinori, Yabashi, Makina, Ozaki, Norimasa, 40303599, 90815705, Okuchi, Takuo, Seto, Yusuke, Tomioka, Naotaka, Matsuoka, Takeshi, Albertazzi, Bruno, Hartley, Nicholas J., Inubushi, Yuichi, Katagiri, Kento, Kodama, Ryosuke, Pikuz, Tatiana A., Purevjav, Narangoo, Miyanishi, Kohei, Sato, Tomoko, Sekine, Toshimori, Sueda, Keiichi, Tanaka, Kazuo A., Tange, Yoshinori, Togashi, Tadashi, Umeda, Yuhei, Yabuuchi, Toshinori, Yabashi, Makina, and Ozaki, Norimasa

Abstract

Meteorites from interplanetary space often include high-pressure polymorphs of their constituent minerals, which provide records of past hypervelocity collisions. These collisions were expected to occur between kilometre-sized asteroids, generating transient high-pressure states lasting for several seconds to facilitate mineral transformations across the relevant phase boundaries. However, their mechanisms in such a short timescale were never experimentally evaluated and remained speculative. Here, we show a nanosecond transformation mechanism yielding ringwoodite, which is the most typical high-pressure mineral in meteorites. An olivine crystal was shock-compressed by a focused high-power laser pulse, and the transformation was time-resolved by femtosecond diffractometry using an X-ray free electron laser. Our results show the formation of ringwoodite through a faster, diffusionless process, suggesting that ringwoodite can form from collisions between much smaller bodies, such as metre to submetre-sized asteroids, at common relative velocities. Even nominally unshocked meteorites could therefore contain signatures of high-pressure states from past collisions.

Published
2021

50. Dynamic interactions in the l-lactate oxidase active site facilitate substrate binding at pH4.5

Author

80200450, Furubayashi, Naoki, Inaka, Koji, Kamo, Masayuki, Umena, Yasufumi, Matsuoka, Takeshi, Morimoto, Yukio, 80200450, Furubayashi, Naoki, Inaka, Koji, Kamo, Masayuki, Umena, Yasufumi, Matsuoka, Takeshi, and Morimoto, Yukio

Abstract

The crystal structure of l-lactate oxidase in complex with l-lactate was solved at a 1.33 Å resolution. The electron density of the bound l-lactate was clearly shown and comparisons of the free form and substrate bound complexes demonstrated that l-lactate was bound to the FMN and an additional active site within the enzyme complex. l-lactate interacted with the related side chains, which play an important role in enzymatic catalysis and especially the coupled movement of H265 and D174, which may be essential to activity. These observations not only reveal the enzymatic mechanism for l-lactate binding but also demonstrate the dynamic motion of these enzyme structures in response to substrate binding and enzymatic reaction progression.

Published
2021

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