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Your search keyword '"Yamashiro, Masashi"' showing total 404 results
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404 results on '"Yamashiro, Masashi"'

5. Ferromagnetic features on zero-bias conductance peaks in ferromagnet/insulator/superconductor junction

Author

Yoshida, Nobukatsu and Yamashiro, Masashi

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Abstract

We present a formula for tunneling conductance in ballistic ferromagnet/ferromagnetic insulator/superconductor junctions where the superconducting state has opposite spin pairing symmetry. The formula can involve correctly a ferromagnetism has been induced by effective mass difference between up- and down-spin electrons. Then, this effective mass mismatch ferromagnet and standard Stoner ferromagnet have been employed in this paper. As an application of the formulation, we have studied the tunneling effect for junctions including spin-triplet p-wave superconductor. The conductace spectra show a clear difference between two ferromagnets depending upon the way of normalization of the conductance. Especially, a essential difference is seen in zero-bias conductance peaks reflecting characteristics of each ferromagnets. From obtained results, it will be suggested that the measurements of the tunneling conductance in the junction provide us a useful information about the mechanism of itinerant ferromagnetism in metal., Comment: 8 pages, 8 figures, references added to the first version

Published
2012
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6. Theory of the d.c. Josephson effect in Pb / Sr2RuO4 / Pb

Author

Yamashiro, Masashi, Tanaka, Yukio, and Kashiwaya, Satoshi

Subjects
Condensed Matter - Superconductivity
Abstract

To clarify the origin of anomalous behaviors in Pb/Sr2RuO4/Pb junctions in terms of the pairing symmetry, a theory of the d.c. Josephson current in s-wave superconductor / p-wave superconductor / s-wave superconductor junctions is developed. Calculated results on the temperature dependence of the critical Josephson current exhibit non-monotonous behaviors when the thickness of the p-wave superconductor is comparable to the coherence length. The consistency between present results with recent experimental measurement supports the possibility of a unitary p-wave pairing state in Sr2RuO4., Comment: 6 pages, 4 eps figures

Published
1998

7. Theoretical study of the Josephson current through a junction including ferromagnetic insulator

Author

Yamashiro, Masashi, Yoshida, Nobukatsu, Tanaka, Yukio, and Kashiwaya, Satoshi

Subjects
Condensed Matter - Superconductivity
Abstract

The properties of Josephson junction including a ferromagnetic insulating layer are studied theoretically. The calculated current shows the anomalous dependence on the magnitude of the exchange interaction at the interface. The Josephson junction changes from 0-junction to $\pi$-junction with the increase of the magnitude of the exchange interaction., Comment: 3 pages Latex, 4 eps figures

Published
1997

8. Tunneling conductance of normal metal/insulator/Sr2RuO4 junction

Author

Yamashiro, Masashi, Tanaka, Yukio, and Kashiwaya, Satoshi

Subjects
Condensed Matter - Superconductivity
Abstract

A theory of tunneling conductance spectra for normal metal/insulator/Sr$_{2}$RuO$_{4}$ junction is studied theoretically. We assume several types of pair potentials with triplet symmetries that are promising candidates for Sr$_{2}$RuO$_{4}$. The calculated conductance spectra show either zero bias peaks or gap like structures depending on the orientations of the junctions. The existence of a residual components in the gap reflects a non-unitary property of the superconducting states. Based on the calculation of a temperature dependence, we will verify that the measurement temperature below 100mK is required to determine the pairing symmetry experimentally., Comment: 3pages, 4 PostScript figures. revised about an error on the format

Published
1997
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9. Theory of tunneling conductance for normal metal/insulator/triplet superconductor junctions

Author

Yamashiro, Masashi, Tanaka, Yukio, Tanuma, Yasunari, and Kashiwaya, Satoshi

Subjects
Condensed Matter - Superconductivity
Abstract

Tunneling conductance spectra of normal metal/insulator/triplet superconductor junctions are investigated theoretically. As triplet paring states we select several types of symmetries that are promising candidates for the superconducting states in UPt$_{3}$ and in Sr$_{2}$RuO$_{4}$. The calculated conductance spectra are sensitive to the orientation of the junction which reflects the anisotropy of the pairing states. They show either zero-bias conductance peaks or gap-like structures depending on the orientation of the junctions. The existence of a residual density of states, peculiar to nonunitary states, is shown to have a significant influence on the properties of the conductance spectra. Present results serve as a guidefor the experimental determination of the symmetry of the pair potentials in UPt$_{3}$ and Sr$_{2}$RuO$_{4}$., Comment: 10 pages, 11 eps figures, J.Phys.Soc.Jpn.67,No.9(1998)

Published
1997
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13. Protocol for a multicentre, prospective observational study of elective neck dissection for clinically node-negative oral tongue squamous cell carcinoma (END-TC study)

Author

Yanamoto, Souichi, primary, Michi, Yasuyuki, additional, Otsuru, Mitsunobu, additional, Inomata, Toru, additional, Nakayama, Hideki, additional, Nomura, Takeshi, additional, Hasegawa, Takumi, additional, Yamamura, Yoshiko, additional, Yamada, Shin-ichi, additional, Kusukawa, Jingo, additional, Yamakawa, Nobuhiro, additional, Hasegawa, On, additional, Ueda, Michihiro, additional, Kitagawa, Yoshimasa, additional, Hiraki, Akimitsu, additional, Hasegawa, Toshihiro, additional, Ohiro, Yoichi, additional, Kobayashi, Wataru, additional, Asoda, Seiji, additional, Kobayashi, Takanori, additional, Iino, Mitsuyoshi, additional, Fukuda, Masayuki, additional, Ishibashi-Kanno, Naomi, additional, Kawaguchi, Koji, additional, Aijima, Reona, additional, Noguchi, Kazuma, additional, Okura, Masaya, additional, Tanaka, Akira, additional, Sugiura, Tsuyoshi, additional, Shintani, Yukari, additional, Yagihara, Kazuhiro, additional, Yamashiro, Masashi, additional, Ota, Yoshihide, additional, Miyazaki, Akihiro, additional, Takeshita, Akinori, additional, Kawamata, Hitoshi, additional, Hiroshi, Iwabuchi, additional, Uchida, Kenichiro, additional, Umeda, Masahiro, additional, Kurita, Hiroshi, additional, and Kirita, Tadaaki, additional

Published
2022
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17. Protocol for a multicentre, prospective observational study of elective neck dissection for clinically node-negative oral tongue squamous cell carcinoma (END-TC study)

Author

Yanamoto, Souichi, Michi, Yasuyuki, Otsuru, Mitsunobu, Inomata, Toru, Nakayama, Hideki, Nomura, Takeshi, Hasegawa, Takumi, Yamamura, Yoshiko, Yamada, Shin-ichi, Kusukawa, Jingo, Yamakawa, Nobuhiro, Hasegawa, On, Ueda, Michihiro, Kitagawa, Yoshimasa, Hiraki, Akimitsu, Hasegawa, Toshihiro, Ohiro, Yoichi, Kobayashi, Wataru, Asoda, Seiji, Kobayashi, Takanori, Iino, Mitsuyoshi, Fukuda, Masayuki, Ishibashi-Kanno, Naomi, Kawaguchi, Koji, Aijima, Reona, Noguchi, Kazuma, Okura, Masaya, Tanaka, Akira, Sugiura, Tsuyoshi, Shintani, Yukari, Yagihara, Kazuhiro, Yamashiro, Masashi, Ota, Yoshihide, Miyazaki, Akihiro, Takeshita, Akinori, Kawamata, Hitoshi, Hiroshi, Iwabuchi, Uchida, Kenichiro, Umeda, Masahiro, Kurita, Hiroshi, Kirita, Tadaaki, Yanamoto, Souichi, Michi, Yasuyuki, Otsuru, Mitsunobu, Inomata, Toru, Nakayama, Hideki, Nomura, Takeshi, Hasegawa, Takumi, Yamamura, Yoshiko, Yamada, Shin-ichi, Kusukawa, Jingo, Yamakawa, Nobuhiro, Hasegawa, On, Ueda, Michihiro, Kitagawa, Yoshimasa, Hiraki, Akimitsu, Hasegawa, Toshihiro, Ohiro, Yoichi, Kobayashi, Wataru, Asoda, Seiji, Kobayashi, Takanori, Iino, Mitsuyoshi, Fukuda, Masayuki, Ishibashi-Kanno, Naomi, Kawaguchi, Koji, Aijima, Reona, Noguchi, Kazuma, Okura, Masaya, Tanaka, Akira, Sugiura, Tsuyoshi, Shintani, Yukari, Yagihara, Kazuhiro, Yamashiro, Masashi, Ota, Yoshihide, Miyazaki, Akihiro, Takeshita, Akinori, Kawamata, Hitoshi, Hiroshi, Iwabuchi, Uchida, Kenichiro, Umeda, Masahiro, Kurita, Hiroshi, and Kirita, Tadaaki

Abstract

Introduction In early-stage oral tongue squamous cell carcinoma (OTSCC), elective neck dissection (END) is recommended when occult lymph node metastasis is suspected; however, there is no unanimous consensus on the risks and benefits of END in such cases. The management of clinically node-negative (cN0) OTSCC remains controversial. This study, therefore, aimed to evaluate the efficacy of END and its impact on the quality of life (QoL) of patients with cN0 OTSCC. Methods and analysis This is a prospective, multicentre, nonrandomised observational study. The choice of whether to perform END at the same time as resection of the primary tumour is based on institutional policy and patient preference. The primary endpoint of this study is 3-year overall survival. The secondary endpoints are 3-year disease-specific survival, 3-year relapse-free survival and the impact on patient QoL. Propensity score-matching analysis will be performed to reduce selection bias. Ethics and dissemination This study was approved by the Clinical Research Review Board of the Nagasaki University. The protocol of this study was registered at the University Hospital Medical Information Network Clinical Trials Registry. The datasets generated during the current study will be available from the corresponding author on reasonable request. The results will be disseminated internationally, through scientific and professional conferences and in peer-reviewed medical journals., BMJ open, 12 (9), art. no. e059615; 2022

Published
2022

21. Efficacy of Superselective Conventional Transarterial Chemoembolization Using Guidance Software for Hepatocellular Carcinoma within Three Lesions Smaller Than 3 cm

Author

Miyayama, Shiro, primary, Yamashiro, Masashi, additional, Ikeda, Rie, additional, Matsumoto, Junichi, additional, Takeuchi, Kiyotaka, additional, Sakuragawa, Naoko, additional, Ueda, Teruyuki, additional, Sanada, Taku, additional, Notsumata, Kazuo, additional, and Terada, Takuro, additional

Published
2021
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