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1,623 results on '"Ogawa, Ryo"'

4. Study of superconductivity of very thin $\mathrm{FeSe}_{1-x}\mathrm{Te}_x$ films investigated by microwave complex conductivity measurements

Author

Matsumoto, Gaku, Ogawa, Ryo, Higasa, Koji, Kobayashi, Tomoki, Nakagawa, Hiroki, and Maeda, Atsutaka

Subjects
Condensed Matter - Superconductivity
Abstract

Complex conductivity measurements spanning the entire temperature range, including the vicinity of $T_c$, were conducted on systematically varied FeSe$_{1-x}$Te$_x$ ($x$ = 0 - 0.5) very thin films. By applying a novel cavity measurement technique employing microwave electric fields parallel to FeSe$_{1-x}$Te$_x$ films, we observed distinct temperature-dependent alterations in superfluid fraction and quasiparticle scattering rate at the nematic boundary. These changes in the nematic boundary suggests variations in the superconducting gap structure between samples in the nematic and non-nematic phase. Moreover, fluctuation is visible up to 1.2 $T_c$ irrespective of nematic order, consistent with large superconducting fluctuations in iron chalcogenide superconductors reported previously in [H. Takahashi $\textit{et al}$, Phys. Rev. B 99, 060503(R) (2019)] and [F. Nabeshima $\textit{et al}$, Phys. Rev. B 97, 024504(R) (2018)].

Published
2024

9. Unanticipated pathological clearance in two cases of clinical T4b dMMR/MSI-h advanced colorectal cancer: the potential of immune checkpoint inhibitors despite positive positron-emission tomography results

Author

Nakamura, Daigaku, Yanagita, Takeshi, Fujii, Yoshiaki, Watanabe, Kaori, Suzuki, Takuya, Ushigome, Hajime, Nishigaki, Ruriko, Sugimura, Naomi, Tanaka, Mamoru, Ogawa, Ryo, Takahashi, Hiroki, Shimura, Takaya, Hotta, Yuji, Matsuo, Yoichi, Kondo, Masahiro, Furukawa-Hibi, Yoko, and Takiguchi, Shuji

Published
2024
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13. Characterization of residual cancer by comparison of a pair of organoids established from a patient with esophageal squamous cell carcinoma before and after neoadjuvant chemotherapy

Author

Fuchino, Takafumi, Kurogi, Shusaku, Tsukamoto, Yoshiyuki, Shibata, Tomotaka, Fumoto, Shoichi, Fujishima, Hajime, Kinoshita, Keisuke, Hirashita, Yuka, Fukuda, Masahide, Nakada, Chisato, Itai, Yusuke, Suzuki, Kosuke, Uchida, Tomohisa, Shiroshita, Hidefumi, Matsumoto, Takashi, Yamaoka, Yoshio, Tsutsumi, Koshiro, Fukuda, Kensuke, Ogawa, Ryo, Mizukami, Kazuhiro, Kodama, Masaaki, Inomata, Masafumi, Murakami, Kazunari, Moriyama, Masatsugu, and Hijiya, Naoki

Published
2024
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21. Crater shape as a possible record of the impact environment of metallic bodies: Effects of temperature, impact velocity and impactor density

Author

Ogawa, Ryo, Nakamura, Akiko M., Suzuki, Ayako I., and Hasegawa, Sunao

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Metallic bodies that were the cores of differentiated bodies are sources of iron meteorites and are considered to have formed early in the terrestrial planet region before migrating to the main asteroid belt. Surface temperatures and mutual collision velocities differ between the terrestrial planet region and the main asteroid belt. To investigate the dependence of crater shape on temperature, velocity and impactor density, we conducted impact experiments on room- and low-temperature iron meteorite and iron alloy targets (carbon steel SS400 and iron-nickel alloy) with velocities of 0.8-7 km/s. The projectiles were rock cylinders and metal spheres and cylinders. Oblique impact experiments were also conducted using stainless steel projectiles and SS400 steel targets which produced more prominent radial patterns downrange at room temperature than at low temperature. Crater diameters and depths were measured and compiled using non-dimensional parameter sets based on the $\pi$-group crater scaling relations. Two-dimensional numerical simulations were conducted using iSALE-2D code with the Johnson-Cook strength model. Both experimental and numerical results showed that the crater depth and diameter decreased with decreasing temperature, which strengthened the target, and with decreasing impact velocity. The decreasing tendency was more prominent for depth than for diameter, i.e., the depth/diameter ratio was smaller for the low temperature and low velocity conditions. The depth/diameter ratios of craters formed by rock projectiles were shallower than those of craters formed by metallic projectiles. Our results imply that the frequency distribution of the depth/diameter ratio for craters on the surface of metallic bodies may be used as a probe of the past impact environment of metallic bodies., Comment: Icarus, accepted (corrected version)

Published
2021
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22. Impact of Perioperative Immunonutrition on Postoperative Outcomes for Patients Undergoing Head and Neck or Gastrointestinal Cancer Surgeries: A Systematic Review and Meta-analysis of Randomized Controlled Trials

Author

Matsui, Ryota, Sagawa, Masano, Sano, Akihiko, Sakai, Makoto, Hiraoka, Shin-ichiro, Tabei, Isao, Imai, Takayuki, Matsumoto, Hideo, Onogawa, Seiji, Sonoi, Norihiro, Nagata, Shigeyuki, Ogawa, Ryo, Wakiyama, Shigeki, Miyazaki, Yasuhiro, Kumagai, Koshi, Tsutsumi, Rie, Okabayashi, Takehiro, Uneno, Yu, Higashibeppu, Naoki, and Kotani, Joji

Published
2024
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23. Microwave Hall effect measurement for materials in the skin depth region

Author

Ogawa, Ryo., Okada, Tatsunori, Takahashi, Hideyuki, Nabeshima, Fuyuki, and Maeda, Atsutaka

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We developed a new microwave Hall effect measurement method for materials in the skin depth region at low temperatures using a cross-shaped bimodal cavity. We analytically calculated electromagnetic fields in the cross-shaped cavity, and the response of the cavity including the sample, whose property is represented by the surface impedance tensor; further, we constructed the method to obtain the Hall component of the surface impedance tensor in terms of the change in resonance characteristics. To confirm the validity of the new method, we applied our method to measure the Hall effect in metallic Bi single crystals at low temperatures, and we confirmed that the microwave Hall angles coincide with the DC Hall angle. Thus, it becomes clear that the Hall angle measurement under cryogenic conditions becomes possible without any complicated tuning mechanisms, and our bimodal cavity method can be used to measure the microwave Hall effect on materials in the skin depth region. The result opens a new approach to discuss the Hall effect in condensed matter physics such as the microwave flux-flow Hall effect in superconductors., Comment: 13 pages, 11 figures

Published
2020
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28. Efficient Establishment of Bile-Derived Organoids From Biliary Cancer Patients

Author

Kinoshita, Keisuke, Tsukamoto, Yoshiyuki, Hirashita, Yuka, Fuchino, Takafumi, Kurogi, Shusaku, Uchida, Tomohisa, Nakada, Chisato, Matsumoto, Takashi, Okamoto, Kazuhisa, Motomura, Mitsuteru, Fukuchi, Satoshi, Sagami, Ryota, Nagai, Takayuki, Gotoh, Yasuhiko, Fukuda, Kensuke, Ogawa, Ryo, Mizukami, Kazuhiro, Okimoto, Tadayoshi, Kodama, Masaaki, Murakami, Kazunari, Moriyama, Masatsugu, and Hijiya, Naoki

Published
2023
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29. Deep Learning Model for Finding New Superconductors

Author

Konno, Tomohiko, Kurokawa, Hodaka, Nabeshima, Fuyuki, Sakishita, Yuki, Ogawa, Ryo, Hosako, Iwao, and Maeda, Atsutaka

Subjects
Computer Science - Machine Learning, Condensed Matter - Materials Science, Condensed Matter - Superconductivity, Computer Science - Computation and Language, Physics - Computational Physics
Abstract

Exploration of new superconductors still relies on the experience and intuition of experts and is largely a process of experimental trial and error. In one study, only 3% of the candidate materials showed superconductivity. Here, we report the first deep learning model for finding new superconductors. We introduced the method named "reading periodic table" which represented the periodic table in a way that allows deep learning to learn to read the periodic table and to learn the law of elements for the purpose of discovering novel superconductors that are outside the training data. It is recognized that it is difficult for deep learning to predict something outside the training data. Although we used only the chemical composition of materials as information, we obtained an $R^{2}$ value of 0.92 for predicting $T_\text{c}$ for materials in a database of superconductors. We also introduced the method named "garbage-in" to create synthetic data of non-superconductors that do not exist. Non-superconductors are not reported, but the data must be required for deep learning to distinguish between superconductors and non-superconductors. We obtained three remarkable results. The deep learning can predict superconductivity for a material with a precision of 62%, which shows the usefulness of the model; it found the recently discovered superconductor CaBi2 and another one Hf0.5Nb0.2V2Zr0.3, neither of which is in the superconductor database; and it found Fe-based high-temperature superconductors (discovered in 2008) from the training data before 2008. These results open the way for the discovery of new high-temperature superconductor families. The candidate materials list, data, and method are openly available from the link https://github.com/tomo835g/Deep-Learning-to-find-Superconductors., Comment: 10 pages in main text. Deep learning, Machine learning, Material search, Superconductors

Published
2018
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34. Superconducting fluctuation in FeSe investigated by precise torque magnetometry

Author

Takahashi, Hideyuki, Nabeshima, Fuyuki, Ogawa, Ryo, Ohmichi, Eiji, Ohta, Hitoshi, and Maeda, Atsutaka

Subjects
Condensed Matter - Superconductivity
Abstract

We investigated the superconducting fluctuation in FeSe, which is assumed to be located in the BCS--BEC crossover region, via magnetic torque measurements. In our method, the absolute cantilever displacement is measured by detecting the interference intensity of the Fabry--Perot cavity formed between the cantilever and optical fiber. Our findings are totally different from the results of the previous torque magnetometry using a piezoresistive cantilever; the "giant" fluctuation diamagnetism related to the BCS--BEC crossover does not exist. Instead, a considerably smaller fluctuation signal originating from the vortex liquid was observed that showed a qualitatively similar behavior to those in cuprate superconductors. We also discuss the inconsistency between our torque data and the existence of a pseudogap proposed by an NMR experiment.

Published
2018
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40. Potential association of eEF1A dimethylation at lysine 55 in the basal area of Helicobacter pylori-eradicated gastric mucosa with the risk of gastric cancer: a retrospective observational study

Author

Hirashita, Yuka, Fukuda, Masahide, Kodama, Masaaki, Tsukamoto, Yoshiyuki, Okimoto, Tadayoshi, Mizukami, Kazuhiro, Kawahara, Yoshinari, Wada, Yasuhiro, Ozaka, Sotaro, Togo, Kazumi, Kinoshita, Keisuke, Fuchino, Takafumi, Fukuda, Kensuke, Okamoto, Kazuhisa, Ogawa, Ryo, Matsunari, Osamu, Honda, Koichi, and Murakami, Kazunari

Published
2022
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41. Robotic extraperitoneal stoma closure with left hemicolectomy for descending colon cancer following abdominoperineal resection: A case report.

Author

Uehara, Shuhei, Ushigome, Hajime, Takahashi, Hiroki, Asai, Hiroyuki, Kato, Akira, Fujii, Yoshiaki, Watanabe, Kaori, Yanagita, Takeshi, Suzuki, Takuya, Ogawa, Ryo, Matsuo, Yoichi, and Takiguchi, Shuji

Subjects
RECTUS abdominis muscles, COLON cancer, HEMICOLECTOMY, SURGICAL robots, ABDOMINAL wall, ABDOMINOPERINEAL resection, COLOSTOMY
Abstract

Extraperitoneal colostomy is often selected to reduce the risk of parastomal hernia. However, its closure surgery is rare and seldom reported. Here, we report our unique experience with robotic left hemicolectomy and extraperitoneal colostomy closure. An 83‐year‐old female was diagnosed with descending colon cancer with stenosis. She had previously undergone abdominoperineal resection with extraperitoneal colostomy. After improving the intestinal obstruction with a self‐expanding stent, we performed robotic left hemicolectomy and extraperitoneal colostomy closure. Thanks to the multijoint function of the robot, which enables the forceps to be angled up to 90° in all directions, we could dissect the stoma from the abdominal wall up to just beneath the rectus abdominis in an intra‐abdominal procedure without enlarging the skin incision. This case suggests that robotic surgery with the articulating function is beneficial for procedures near the abdominal wall ceiling and effective for extraperitoneal colostomy closure. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Real‐world data on efficacy/safety and economic impact of nivolumab administered every 2 and 4 weeks among Japanese patients

Author

Tasaki, Yoshihiko, primary, Ito, Nanami, additional, Mimura, Yoshihisa, additional, Sugiyama, Yosuke, additional, Ogawa, Ryo, additional, Shimura, Takaya, additional, Nakamura, Motoki, additional, Kawakita, Daisuke, additional, Hamamoto, Shuzo, additional, Uemura, Takehiro, additional, Yokota, Keisuke, additional, Iida, Moeko, additional, Odagiri, Kunihiro, additional, Kimura, Yuka, additional, Hotta, Yuji, additional, Komatsu, Hirokazu, additional, Okuda, Katsuhiro, additional, Niimi, Akio, additional, Yasui, Takahiro, additional, Iwasaki, Shinichi, additional, Morita, Akimichi, additional, Kataoka, Hiromi, additional, Takiguchi, Shuji, additional, and Furukawa‐Hibi, Yoko, additional

Published
2024
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44. Expression of ZKSCAN3 protein suppresses proliferation, migration, and invasion of pancreatic cancer through autophagy

Author

Nonoyama, Keisuke, primary, Matsuo, Yoichi, additional, Sugita, Saburo, additional, Eguchi, Yuki, additional, Denda, Yuki, additional, Murase, Hiromichi, additional, Kato, Tomokatsu, additional, Imafuji, Hiroyuki, additional, Saito, Kenta, additional, Morimoto, Mamoru, additional, Ogawa, Ryo, additional, Takahashi, Hiroki, additional, Mitsui, Akira, additional, Kimura, Masahiro, additional, and Takiguchi, Shuji, additional

Published
2024
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