5,085 results on '"Yoshimura, K."'
Search Results
2. The Duel of Magnetic Interactions & Structural Instabilities: Itinerant Frustration in the Triangular Lattice Compound LiCrSe$_2$
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Nocerino, E., Kobayashi, S., Witteveen, C., Forslund, O. K., Matsubara, N., Tang, C., Matsukawa, T., Hoshikawa, A., Koda, A., Yoshimura, K., Umegaki, I., Sassa, Y., von Rohr, F. O., Pomjakushin, V., Brewer, J. H., Sugiyama, J., and Månsson, M.
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Condensed Matter - Strongly Correlated Electrons - Abstract
The recent synthesis of the chromium selenide compound LiCrSe$_2$ constitutes a valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets (2D-TLA). In this work we present the very first comprehensive study of the combined low temperature nuclear and magnetic structure established in this material. Details on the connection between Li-ion dynamics and structural changes are also presented along with a direct link between atomic structure and spin order via a strong magnetoelastic coupling. LiCrSe$_2$ was found to undergo a first order structural transition from a trigonal crystal system with space group $P\bar{3}m1$ to a monoclinic one with space group $C2/m$ at $T_{\rm s}=30$~K. Such restructuring of the lattice is accompanied by a magnetic transition at $T_{\rm N}=30$~K, with the formation of a complex spin arrangement for the Cr$^{3+}$ moments. Refinement of the magnetic structure with neutron diffraction data and complementary muon spin rotation analysis reveal the presence of two incommensurate magnetic domains with a up-up-down-down arrangement of the spins with ferromagnetic (FM) double chains coupled antiferromagnetically (AFM). In addition to this unusual arrangement, the spin axial vector is modulated both in direction and modulus, resulting in a spin density wave-like order with periodic suppression of the Cr moment along the chains. This behavior is believed to appear as a result of strong competition between direct exchange AFM and superexchange FM couplings established between both nearest neighbor and next nearest neighbor Cr$^{3+}$ ions. We finally conjecture that the resulting magnetic order is stabilized via subtle vacancy/charge order within the Li layers, potentially causing a mix of two different magnetic phases within the sample.
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- 2022
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3. Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe$_2$ investigated by $\mu^+$SR as well as neutron and X-ray diffraction
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Nocerino, E., Witteveen, C., Kobayashi, S., Forslund, O. K., Matsubara, N., Zubayer, A., Mazza, F., Kawaguchi, S., Hoshikawa, A., Umegaki, I., Sugiyama, J., Yoshimura, K., Sassa, Y., von Rohr, F. O., and Månsson, M.
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Condensed Matter - Strongly Correlated Electrons - Abstract
Two$-$dimensional (2D) triangular lattices antiferromagnets (2D$-$TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2$-$dimensional transition metal dichalcogenide LiCrTe$_2$, being a 2D$-$TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation ($\mu^+$SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe$_2$. From high$-$resolution NPD the magnetic spin order at base$-$temperature is not, as previously suggested, helical, but rather collinear antiferromagnetic (AFM) with ferromagnetic (FM) spin coupling within the $ab-$plane and AFM coupling along the $c-$axis. The ordered magnetic Cr moment is established as $\mu_{\rm Cr}=$ 2.36 $\mu_{\rm B}$. From detailed $\mu^+$SR measurements we observe an AFM ordering temperature $T_{\rm N}\approx$ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From $\mu^+$SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe$_2$ in the 3D Heisenberg AFM universality class. Finally, by combining our magnetic studies with high$-$resolution synchrotron X$-$ray diffraction (XRD), we find a clear coupling between the nuclear and magnetic spin lattices. This suggests the possibility for a strong magnon$-$phonon coupling, similar to what has been previously observed in the closely related compound LiCrO$_2$.
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- 2022
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4. SiPM module for the ACME III electron EDM search
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Hiramoto, A., Masuda, T., Ang, D. G., Meisenhelder, C., Panda, C., Sasao, N., Uetake, S., Wu, X., Demille, D., Doyle, J. M., Gabrielse, G., and Yoshimura, K.
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Physics - Instrumentation and Detectors - Abstract
This report shows the design and the performance of a large area Silicon Photomultiplier (SiPM) module developed detection of fluorescent light emitted from a 10 cm scale volume. The module was optimized for the planned ACME III electron electric dipole moment (eEDM) search, which will be a powerful probe for the existence of physics beyond the Standard Model of particle physics. The ACME experiment searched for the eEDM with the world's highest sensitivity using cold ThO polar molecules (ACME II). In ACME III, SiPMs will be used for detection of fluorescent photons (the fundamental signal of the experiment) instead of PMTs, which were used in the previous measurement. We have developed an optimized SiPM module, based on a 16-channel SiPM array. Key operational parameters are characterized, including gain and noise. The SiPM dark count rate, background light sensitivity, and optical crosstalk are found to all be well suppressed and more than sufficient for the ACME III application., Comment: 10 pages, 6 figures, proceedings for NDIP20
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- 2022
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5. Peak in the critical current density in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ tuned towards the structural quantum critical point
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Liu, Xinyou, Zhang, Wei, Lai, Kwing To, Moriyama, K., Tallon, J. L., Yoshimura, K., and Goh, Swee K.
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Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
(Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ is a rare system that has been shown to display an interesting interplay between structural quantum criticality and superconductivity. A putative structural quantum critical point, which is hidden beneath a broad superconducting dome, is believed to give rise to optimized superconducting properties in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$. However, the presence of the superconducting dome itself hinders the examination of the quantum critical point through electrical transport, as the transport coefficients vanish in the superconducting state. Here, we use critical current density to explore within the superconducting dome. Our measurements reveal a large enhancement of the critical current density at the zero-temperature limit when the system is tuned towards the structural quantum critical point., Comment: 7 pages, 4 figures
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- 2022
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6. Nurturing the Industrial Accelerator Technology Base in the US
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Todd, A. M. M., Agustsson, R., Bruhwiler, D. L., Chunguang, J., Gottschalk, S. C., Kanareykin, A., Murokh, A., Rathke, J. W., Ruelas, M., Yakovlev, V., and Yoshimura, K.
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Physics - Accelerator Physics - Abstract
The purpose of this white paper is to discuss the importance of having a world class domestic industrial vendor base, capable of supporting the needs of the particle accelerator facilities, and the necessary steps to support and develop such a base in the United States. The paper focuses on economic, regulatory, and policy-driven barriers and hurdles, which presently limit the depth and scope of broader industrial participation in US accelerator facilities. It discusses the international competition landscape and proposes steps to improve the strength and vitality of US industry., Comment: contribution to Snowmass 2021
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- 2022
7. Measurement of differential cross sections for $\Sigma^+p$ elastic scattering in the momentum range 0.44-0.80 GeV/c
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Collaboration, J-PARC E40, Nanamura, T., Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T. K., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
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Nuclear Experiment - Abstract
We performed a novel $\Sigma^+ p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $\Sigma^+ p$ elastic scattering events were identified from $4.9 \times 10^7$ tagged $\Sigma^+$ particles in the $\Sigma^+$ momentum range 0.44 -- 0.80 GeV/$c$. The differential cross sections of the $\Sigma^+ p$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $^3 S_1$ and $^1 P_1$ channels for the first time. The phase shift of the $^3 S_1$ channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as $20^\circ<|\delta_{^3S_1}|<35^\circ$. If the sign of $\delta_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.
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- 2022
8. A Case of Tumor-Induced Osteomalacia Detected by Venous Sampling
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Horinouchi Y, Shiota S, Kaimori R, Yoshimura K, Utsunomiya-Nishimizu R, Yamamoto K, and Miyazaki E
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hypophosphatemia ,tio ,fgf23 ,burosumab ,Medicine (General) ,R5-920 - Abstract
Yasuo Horinouchi, Seiji Shiota, Ryo Kaimori, Katsuhiko Yoshimura, Rie Utsunomiya-Nishimizu, Kyoko Yamamoto, Eishi Miyazaki Department of General Medicine, Oita University Faculty of Medicine, Yufu, Oita, 879-5593, JapanCorrespondence: Seiji Shiota, Department of General Medicine, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan, Tel +81-97-586-5106, Fax +81-97-586-5573, Email sshiota@oita-u.ac.jpAbstract: Tumor-induced osteomalacia (TIO) can cause osteomalacia due to excessive production of fibroblast growth factor 23 (FGF23) by the tumor. Since TIO is a very rare disease, it is often misdiagnosed as intervertebral disc herniation, spondyloarthritis, or osteoporosis. We report a 65-year-old man who developed generalized arthralgia and difficulty walking two years ago and was diagnosed with multiple fractures throughout his body. He was initially diagnosed with osteoporosis and was treated with calcitriol. However, he was referred to our hospital since his symptoms did not improve. We diagnosed tumor-induced osteomalacia based on low serum phosphorus, high bone-type alkaline phosphatase, high FGF23 levels, and the presence of two tumors. The responsible tumor was identified using FGF23 levels in venous sampling. As the location of the tumor made surgical resection difficult, we selected treatment with burosumab, a human monoclonal antibody against FGF23, leading to improvement in the hypophosphatemia and pain, such that he was able to walk with a cane. In cases of osteoporosis with hypophosphatemia, general physicians should keep TIO in mind, and attempt to identify the responsible tumor lesion.Keywords: hypophosphatemia, TIO, FGF23, burosumab
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- 2023
9. Precise measurement of differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction in momentum range 470-650 MeV/c
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Collaboration, J-PARC E40, Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Nanamura, T., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
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Nuclear Experiment ,Nuclear Theory - Abstract
The differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction were measured accurately for the {\Sigma}- momentum (p_{{\Sigma}}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the {\Sigma}-p --> {\Lambda} n reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of {\Delta}cos{\theta} = 0.1. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions.The cross sections integrated for -0.7 < cos{\theta} < 1.0 were obtained as 22.5 +- 0.68 (stat.) +- 0.65 (syst.) mb and 15.8 +-0.83(stat.) +- 0.52 (syst.) mb for 470
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- 2021
10. Estimation of radiative half-life of $^{229m}$Th by half-life measurement of other nuclear excited states in $^{229}$Th
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Shigekawa, Y., Yamaguchi, A., Suzuki, K., Haba, H., Hiraki, T., Kikunaga, H., Masuda, T., Nishimura, S., Sasao, N., Yoshimi, A., and Yoshimura, K.
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Nuclear Experiment ,Physics - Atomic Physics - Abstract
We perform coincidence measurements between $\alpha$ particles and $\gamma$ rays from a $^{233}$U source to determine the half-lives of the excited state in a $^{229}$Th nucleus. We first prove that the half-lives of 42.43- and 164.53-keV states are consistent with literature values, whereas that of the 97.14-keV state (93(7) ps) deviates from a previously measured value (147(12) ps). The half-lives of 71.83- and 163.25-keV states are determined for the first time. Based on the obtained half-lives and the Alaga rule, we estimate the radiative half-life of the low-energy isomeric state ($^{229m}$Th) to be $5.0(11)\times10^{3}$ s, which is one of the key parameters for the frequency standard based on $^{229}$Th., Comment: 33 pages, 9 figures. 3 tables
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- 2021
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11. Measurement of the differential cross sections of the Sigma-p elastic scattering in momentum range of 470 to 850 MeV/c
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Collaboration, J-PARC E40, Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Nanamura, T., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
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Nuclear Experiment - Abstract
A high statistics $\Sigma p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $\Sigma^{-}$ running in a liquid hydrogen target were accumulated by detecting the $\pi^{-}p \to K^{+}\Sigma^{-}$ reaction with a high intensity $\pi^{-}$ beam of 20 M/spill. Differential cross sections of the $\Sigma^{-}p$ elastic scattering were derived with a drastically improved accuracy by identifying the largest statistics of about 4,500 events from 1.72 $\times$ $10^{7}$ $\Sigma^{-}$. The derived differential cross section shows a clear forward-peaking angular distribution for a $\Sigma^{-}$ momentum range from 470 to 850 MeV/$c$. The accurate data will impose a strong constraint on the theoretical models of the baryon-baryon interactions.
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- 2021
12. Evidence of a structural quantum critical point in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ from a lattice dynamics study
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Cheung, Y. W., Hu, Y. J., Imai, M., Tanioku, Y., Kanagawa, H., Murakawa, J., Moriyama, K., Zhang, W., Lai, K. T., Yoshimura, K., Grosche, F. M., Kaneko, K., Tsutsui, S., and Goh, Swee K.
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Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
Approaching a quantum critical point (QCP) has been an effective route to stabilize superconductivity. While the role of magnetic QCPs has been extensively discussed, similar exploration of a structural QCP is scarce due to the lack of suitable systems with a continuous structural transition that can be conveniently tuned to 0~K. Using inelastic X-ray scattering, we examine the phonon spectrum of the nonmagnetic quasi-skutterudite (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$, which represents a precious system to explore the interplay between structural instabilities and superconductivity by tuning the Ca concentration $x$. We unambiguously detect the softening of phonon modes around the M point on cooling towards the structural transition. Intriguingly, at $x=0.85$, the soft mode energy squared at the M point extrapolates to zero at $(-5.7 \pm 7.7)$~K, providing the first compelling microscopic evidence of a structural QCP in (Ca$_{x}$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$. The enhanced phonon density-of-states at low energy provides the essential ingredient for realizing strong-coupling superconductivity near the structural QCP., Comment: 6 pages, 4 figures
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- 2018
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13. SiPM module for the ACME III electron EDM search
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Hiramoto, A., Masuda, T., Ang, D.G., Meisenhelder, C., Panda, C., Sasao, N., Uetake, S., Wu, X., Demille, D., Doyle, J.M., Gabrielse, G., and Yoshimura, K.
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- 2023
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14. δ18O of Marine‐Influenced Tectona grandis L. f. From Equatorial Indonesia: A Local Rainfall Amount and Remote ENSO Indicator
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Nurhati, I. S., primary, Evans, M. N., additional, Cahyarini, S. Y., additional, D’Arrigo, R. D., additional, Yoshimura, K., additional, and Herho, S. H. S., additional
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- 2024
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15. Synoptic Moisture Intrusion Provided Heavy Isotope Precipitations in Inland Antarctica During the Last Glacial Maximum
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Kino, K., primary, Cauquoin, A., additional, Okazaki, A., additional, Oki, T., additional, and Yoshimura, K., additional
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- 2024
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16. Energy response of X-rays under high flux conditions using a thin APD for the energy range of 6-33 keV
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Masuda, T., Hiraki, T., Kaino, H., Kishimoto, S., Miyamoto, Y., Okai, K., Okubo, S., Ozaki, R., Sasao, N., Suzuki, K., Uetake, S., Yoshimi, A., and Yoshimura, K.
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Physics - Instrumentation and Detectors ,Nuclear Experiment - Abstract
This paper reports on the demonstration of a high-rate energy measurement technique using a thin depletion layer silicon avalanche photodiode (Si-APD). A dedicated amplitude-to-time converter is developed to realize simultaneous energy and timing measurement in a high rate condition. The energy response of the system is systematically studied by using monochromatic X-ray beam with an incident energy ranging from 6 to 33 keV. The obtained energy spectra contain clear peaks and tail distributions. The peak fraction monotonously decreases as the incident photon energy increases. This phenomenon can be explained by considering the distribution of the energy deposit in silicon, which is investigated by using a Monte Carlo simulation.
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- 2018
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17. Nuclear resonant scattering experiment with fast time response: new scheme for observation of $^{229\rm m}$Th radiative decay
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Yoshimi, A., Hara, H., Hiraki, T., Kasamatsu, Y., Kitao, S., Kobayashi, Y., Konashi, K., Masuda, R., Masuda, T., Miyamoto, Y., Okai, K., Okubo, S., Ozaki, R., Sasao, N., Sato, O., Seto, M., Schumm, T., Shigekawa, Y., Stellmer, S., Suzuki, K., Uetake, S., Watanabe, M., Yamaguchi, A., Yasuda, Y., Yoda, Y., Yoshimura, K., and Yoshimura, M.
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Nuclear Experiment ,Physics - Atomic Physics - Abstract
Nuclear resonant excitation of the 29.19-keV level in $^{229}$Th with high-brilliance synchrotron- radiation and detection of its decay signal, are proposed with the aim of populating the extremely low-energy isomeric state of $^{229}$Th.The proposed experiment, known as nuclear resonant scattering (NRS), has the merit of being free from uncertainties about the isomer level energy. However, it requires higher time resolution and shorter tail in the response function of the detector than that of conventional NRS experiments because of the short lifetime of the 29.19-keV state. We have fabricated an X-ray detector system which has a time resolution of 56 ps and a shorter tail function than the previously reported one. We have demonstrated an NRS experiment with the 26.27-keV nuclear level of $^{201}$Hg for feasibility assessment of the $^{229}$Th experiment. The NRS signal is clearly distinct from the prompt electronic scattering signal by the implemented detector system. The half-life of the 26.27-keV state of $^{201}$Hg is determined as 629 $\pm$ 18 ps which is better precision by a factor three than that reported to date., Comment: 11 pages, 5 figures
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- 2017
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18. Fast X-ray detector system with simultaneous measurement of timing and energy for a single photon
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Masuda, T., Okubo, S., Hara, H., Hiraki, T., Kitao, S., Miyamoto, Y., Okai, K., Ozaki, R., Sasao, N., Seto, M., Uetake, S., Yamaguchi, A., Yoda, Y., Yoshimi, A., and Yoshimura, K.
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Physics - Instrumentation and Detectors - Abstract
We developed a fast X-ray detector system for nuclear resonant scattering (NRS) experiments. Our system employs silicon avalanche photo-diode (Si-APD) as a fast X-ray sensor. The system is able to acquire both timing and energy of a single X-ray photon simultaneously in a high rate condition, $10^6$ counts per second for one Si-APD. The performance of the system was investigated in SPring-8, a synchrotron radiation facility in Japan. Good time resolution of \SI{120}{ps} (FWHM) was achieved with a slight tail distribution in the time spectrum by a level of $10^{-9}$ at 1 ns apart from the peak. Using this system, we successfully observed the NRS from the 26.27-keV level of mercury-201, which has a half-life of $630 \pm 50$ ps. We also demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy., Comment: 7 pages, 12 figures
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- 2017
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19. Gas and humidity analyses in gasochromic processes of switchable mirrors
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Yamada, Y. and Yoshimura, K.
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- 2021
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20. Modeling Natural Tritium in Precipitation and its Dependence on Decadal Solar Activity Variations Using the Atmospheric General Circulation Model MIROC5‐Iso
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Cauquoin, A., primary, Fourré, É., additional, Landais, A., additional, Okazaki, A., additional, and Yoshimura, K., additional
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- 2024
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21. The Seasonal Changes in the Beach Topography in Karatsu Coast, Japan
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Chu, D. T., Sanuki, H., Nishihata, T., Tsuru, M., Yoshimura, K., Suzuki, K., Miyahara, K., Katayama, H., Kubo, T., Trung Viet, Nguyen, editor, Xiping, Dou, editor, and Thanh Tung, Tran, editor
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- 2020
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22. Sarcopenia and Visceral Obesity are Significantly Related to Severe Storage Symptoms in Geriatric Female Patients
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Hashimoto M, Shimizu N, Nishimoto M, Minami T, Fujita K, Yoshimura K, Hirayama A, and Uemura H
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female ,international prostate symptom score ,overactive bladder symptom ,psoas muscle ,visceral fat ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Mamoru Hashimoto,1 Nobutaka Shimizu,1 Mitsuhisa Nishimoto,1 Takafumi Minami,1 Kazutoshi Fujita,1 Kazuhiro Yoshimura,1 Akihide Hirayama,2 Hirotsugu Uemura1 1Department of Urology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan; 2Department of Urology, Kindai Nara Hospital, Osaka-Sayama, JapanCorrespondence: Nobutaka ShimizuDepartment of Urology, Kindai University Faculty of Medicine, 377-2, Ohno-Higashi, Osaka-Sayama, Osaka, 589-8511, JapanTel +81-72-366-0221Fax +81-72-365-6273Email shimizun@med.kindai.ac.jpPurpose: This study aimed to elucidate the relationship of psoas muscle atrophy and visceral obesity with lower urinary tract symptoms in geriatric female patients.Patients and Methods: We retrospectively reviewed the medical records of female patients aged ≥ 65 years. The psoas muscle index was defined, using computed tomography, as the cross-sectional area of the psoas muscle at the third lumbar vertebral level divided by the body surface area. We also measured visceral fat area at the umbilical level using computed tomography. We used logistic regression analysis to examine the relationships between the International Prostate Symptom Score (total score, voiding subscore, and storage subscore) and variables, such as age, body mass index, psoas muscle index, and visceral fat area. The International Prostate Symptom Score was categorized as mild, moderate, or severe.Results: One hundred thirty-nine patients were included in our study. In the logistic regression analysis, we found statistically significant relationships between severe (versus mild-to-moderate) International Prostate Symptom Score storage subscore and variables, including low and high levels of psoas muscle index and visceral fat area, respectively. We could not find any significant relationships between the International Prostate Symptom Score total score and voiding subscore and the variables.Conclusion: Psoas muscle atrophy and visceral fat accumulation are potential risk factors for severe storage symptoms in female patients aged ≥ 65 years.Keywords: female, International Prostate Symptom Score, overactive bladder symptom, psoas muscle, visceral fat
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- 2021
23. Status of cosmic-ray antideuteron searches
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von Doetinchem, P., Aramaki, T., Boggs, S., Bufalino, S., Dal, L., Donato, F., Fornengo, N., Fuke, H., Grefe, M., Hailey, C., Hamilton, B., Ibarra, A., Mitchell, J., Mognet, I., Ong, R. A., Pereira, R., Perez, K., Putze, A., Raklev, A., Salati, P., Sasaki, M., Tarle, G., Urbano, A., Vittino, A., Wild, S., Xue, W., and Yoshimura, K.
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High Energy Physics - Phenomenology ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Instrumentation and Methods for Astrophysics ,High Energy Physics - Experiment - Abstract
The precise measurement of cosmic-ray antiparticles serves as important means for identifying the nature of dark matter. Recent years showed that identifying the nature of dark matter with cosmic-ray positrons and higher energy antiprotons is difficult, and has lead to a significantly increased interest in cosmic-ray antideuteron searches. Antideuterons may also be generated in dark matter annihilations or decays, offering a potential breakthrough in unexplored phase space for dark matter. Low-energy antideuterons are an important approach because the flux from dark matter interactions exceeds the background flux by more than two orders of magnitude in the low-energy range for a wide variety of models. This review is based on the "dbar14 - dedicated cosmic-ray antideuteron workshop", which brought together theorists and experimentalists in the field to discuss the current status, perspectives, and challenges for cosmic-ray antideuteron searches and discusses the motivation for antideuteron searches, the theoretical and experimental uncertainties of antideuteron production and propagation in our Galaxy, as well as give an experimental cosmic-ray antideuteron search status update. This report is a condensed summary of the article "Review of the theoretical and experimental status of dark matter identification with cosmic-ray antideuteron" (arXiv:1505.07785)., Comment: 9 pages, 4 figures, ICRC 2015 proceedings
- Published
- 2015
24. Measurement and comparison of individual external doses of high-school students living in Japan, France, Poland and Belarus -- the 'D-shuttle' project --
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Adachi, N., Adamovitch, V., Adjovi, Y., Aida, K., Akamatsu, H., Akiyama, S., Akli, A., Ando, A., Andrault, T., Antonietti, H., Anzai, S., Arkoun, G., Avenoso, C., Ayrault, D., Banasiewicz, M., Banaśkiewicz, M., Bernandini, L., Bernard, E., Berthet, E., Blanchard, M., Boreyko, D., Boros, K., Charron, S., Cornette, P., Czerkas, K., Dameron, M., Date, I., De Pontbriand, M., Demangeau, F., Dobaczewski, Ł., Dobrzyński, L., Ducouret, A., Dziedzic, M., Ecalle, A., Edon, V., Endo, K., Endo, T., Endo, Y., Etryk, D., Fabiszewska, M., Fang, S., Fauchier, D., Felici, F., Fujiwara, Y., Gardais, C., Gaul, W., Guérin, L., Hakoda, R., Hamamatsu, I., Handa, K., Haneda, H., Hara, T., Hashimoto, M., Hashimoto, T., Hashimoto, K., Hata, D., Hattori, M., Hayano, R., Hayashi, R., Higasi, H., Hiruta, M., Honda, A., Horikawa, Y., Horiuchi, H., Hozumi, Y., Ide, M., Ihara, S., Ikoma, T., Inohara, Y., Itazu, M., Ito, A., Janvrin, J., Jout, I., Kanda, H., Kanemori, G., Kanno, M., Kanomata, N., Kato, T., Kato, S., Katsu, J., Kawasaki, Y., Kikuchi, K., Kilian, P., Kimura, N., Kiya, M., Klepuszewski, M., Kluchnikov, E., Kodama, Y., Kokubun, R., Konishi, F., Konno, A., Kontsevoy, V., Koori, A., Koutaka, A., Kowol, A., Koyama, Y., Kozioł, M., Kozue, M., Kravtchenko, O., Kruczała, W., Kudła, M., Kudo, H., Kumagai, R., Kurogome, K., Kurosu, A., Kuse, M., Lacombe, A., Lefaillet, E., Magara, M., Malinowska, J., Malinowski, M., Maroselli, V., Masui, Y., Matsukawa, K., Matsuya, K., Matusik, B., Maulny, M., Mazur, P., Miyake, C., Miyamoto, Y., Miyata, K., Miyazaki, M., Molęda, M., Morioka, T., Morita, E., Muto, K., Nadamoto, H., Nadzikiewicz, M., Nagashima, K., Nakade, M., Nakayama, C., Nakazawa, H., Nihei, Y., Nikul, R., Niwa, S., Niwa, O., Nogi, M., Nomura, K., Ogata, D., Ohguchi, H., Ohno, J., Okabe, M., Okada, M., Okada, Y., Omi, N., Onodera, H., Onodera, K., Ooki, S., Oonishi, K., Oonuma, H., Ooshima, H., Oouchi, H., Orsucci, M., Paoli, M., Penaud, M., Perdrisot, C., Petit, M., Piskowski, A., Płocharski, A., Polis, A., Polti, L., Potsepnia, T., Przybylski, D., Pytel, M., Quillet, W., Remy, A., Robert, C., Sadowski, M., Saito, M., Sakuma, D., Sano, K., Sasaki, Y., Sato, N., Schneider, T., Schneider, C., Schwartzman, K., Selivanov, E., Sezaki, M., Shiroishi, K., Shustava, I., Śniecińska, A., Stalchenko, E., Staroń, A., Stromboni, M., Studzińska, W., Sugisaki, H., Sukegawa, T., Sumida, M., Suzuki, Y., Suzuki, K., Suzuki, R., Suzuki, H., Świderski, W., Szudejko, M., Szymaszek, M., Tada, J., Taguchi, H., Takahashi, K., Tanaka, D., Tanaka, G., Tanaka, S., Tanino, K., Tazbir, K., Tcesnokova, N., Tgawa, N., Toda, N., Tsuchiya, H., Tsukamoto, H., Tsushima, T., Tsutsumi, K., Umemura, H., Uno, M., Usui, A., Utsumi, H., Vaucelle, M., Wada, Y., Watanabe, K., Watanabe, S., Watase, K., Witkowski, M., Yamaki, T., Yamamoto, J., Yamamoto, T., Yamashita, M., Yanai, M., Yasuda, K., Yoshida, Y., Yoshida, A., Yoshimura, K., Żmijewska, M., and Zuclarelli, E.
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Physics - Medical Physics - Abstract
Twelve high schools in Japan (of which six are in Fukushima Prefecture), four in France, eight in Poland and two in Belarus cooperated in the measurement and comparison of individual external doses in 2014. In total 216 high-school students and teachers participated in the study. Each participant wore an electronic personal dosimeter "D-shuttle" for two weeks, and kept a journal of his/her whereabouts and activities. The distributions of annual external doses estimated for each region overlap with each other, demonstrating that the personal external individual doses in locations where residence is currently allowed in Fukushima Prefecture and in Belarus are well within the range of estimated annual doses due to the background radiation level of other regions/countries.
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- 2015
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25. Measurements of cosmic-ray proton and helium spectra from the BESS-Polar long-duration balloon flights over Antarctica
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Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Instrumentation and Methods for Astrophysics ,Physics - Instrumentation and Detectors - Abstract
The BESS-Polar Collaboration measured the energy spectra of cosmic-ray protons and helium during two long-duration balloon flights over Antarctica in December 2004 and December 2007, at substantially different levels of solar modulation. Proton and helium spectra probe the origin and propagation history of cosmic rays in the galaxy, and are essential to calculations of the expected spectra of cosmic-ray antiprotons, positrons, and electrons from interactions of primary cosmic-ray nuclei with the interstellar gas, and to calculations of atmospheric muons and neutrinos. We report absolute spectra at the top of the atmosphere for cosmic-ray protons in the kinetic energy range 0.2-160 GeV and helium nuclei 0.15-80 GeV/nucleon. The corresponding magnetic rigidity ranges are 0.6-160 GV for protons and 1.1-160 GV for helium. These spectra are compared to measurements from previous BESS flights and from ATIC-2, PAMELA, and AMS-02. We also report the ratio of the proton and helium fluxes from 1.1 GV to 160 GV and compare to ratios from PAMELA and AMS-02., Comment: 23 pages, 11 figures, Accepted for publication in The Astrophysical Journal
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- 2015
- Full Text
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26. Review of the theoretical and experimental status of dark matter identification with cosmic-ray antideuterons
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Aramaki, T., Boggs, S., Bufalino, S., Dal, L., von Doetinchem, P., Donato, F., Fornengo, N., Fuke, H., Grefe, M., Hailey, C., Hamilton, B., Ibarra, A., Mitchell, J., Mognet, I., Ong, R. A., Pereira, R., Perez, K., Putze, A., Raklev, A., Salati, P., Sasaki, M., Tarle, G., Urbano, A., Vittino, A., Wild, S., Xue, W., and Yoshimura, K.
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High Energy Physics - Phenomenology ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Instrumentation and Methods for Astrophysics ,High Energy Physics - Experiment - Abstract
Recent years have seen increased theoretical and experimental effort towards the first-ever detection of cosmic-ray antideuterons, in particular as an indirect signature of dark matter annihilation or decay. In contrast to indirect dark matter searches using positrons, antiprotons, or gamma-rays, which suffer from relatively high and uncertain astrophysical backgrounds, searches with antideuterons benefit from very suppressed conventional backgrounds, offering a potential breakthrough in unexplored phase space for dark matter. This article is based on the first dedicated cosmic-ray antideuteron workshop, which was held at UCLA in June 2014. It reviews broad classes of dark matter candidates that result in detectable cosmic-ray antideuteron fluxes, as well as the status and prospects of current experimental searches. The coalescence model of antideuteron production and the influence of antideuteron measurements at particle colliders are discussed. This is followed by a review of the modeling of antideuteron propagation through the magnetic fields, plasma currents, and molecular material of our Galaxy, the solar system, the Earth's geomagnetic field, and the atmosphere. Finally, the three ongoing or planned experiments that are sensitive to cosmic-ray antideuterons, BESS, AMS-02, and GAPS, are detailed. As cosmic-ray antideuteron detection is a rare event search, multiple experiments with orthogonal techniques and backgrounds are essential. Many theoretical and experimental groups have contributed to these studies over the last decade, this review aims to provide the first coherent discussion of the relevant dark matter theories that antideuterons probe, the challenges to predictions and interpretations of antideuteron signals, and the experimental efforts toward cosmic antideuteron detection., Comment: 72 pages, 20 figures
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- 2015
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27. Soft X-ray Angle Resolved Photoemission with Micro Positioning Techniques for Metallic V$_2$O$_3$
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Fujiwara, H., Kiss, T., Wakabayashi, Y. K., Nishitani, Y., Mori, T., Nakata, Y., Kitayama, S., Fukushima, K., Ikeda, S., Fuchimoto, H., Minowa, Y., Mo, S. -K., Denlinger, J. D., Allen, J. W., Metcalf, P., Imai, M., Yoshimura, K., Suga, S., Muro, T., and Sekiyama, A.
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Condensed Matter - Strongly Correlated Electrons - Abstract
We have performed soft-X-ray angle resolved photoemission for metallic V$_2$O$_3$. Combining a micro focus beam (40 x 65 ${\mu}$m$^2$) and micro positioning techniques with a long working distance microscope, we have succeeded in observing band dispersions from tiny cleavage surfaces with typical size of the several tens of ${\mu}$m. The photoemission spectra show a clear position dependence reflecting the morphology of the cleaved sample surface. By selecting high quality flat regions on the sample surface, we have succeeded in band mapping using both photon-energy and polar-angle dependences, opening the door to three-dimensional ARPES for typical three dimensional correlated materials where large cleavage planes are rarely obtained., Comment: 5 pages, 4 figures, to be published in Journal of Synchrotron Radiation
- Published
- 2015
28. Search for a spin-nematic phase in the quasi-one-dimensional frustrated magnet LiCuVO$_4$
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Büttgen, N., Nawa, K., Fujita, T., Hagiwara, M., Kuhns, P., Prokofiev, A., Reyes, A. P., Svistov, L. E., Yoshimura, K., and Takigawa, M.
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Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons - Abstract
We have performed NMR experiments on the quasi one-dimensional frustrated spin-1/2 system LiCuVO$_4$ in magnetic fields $H$ applied along the c-axis up to field values near the saturation field $H_{\rm sat}$. For the field range $H_{\rm c2}
41.4$T, indicating that the majority of magnetic moments in LiCuVO$_4$ are already saturated in this field range. This result is inconsistent with the previously observed linear field dependence of the magnetization $M(H)$ for $H_{\rm c3} - Published
- 2014
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29. δ18O of Marine‐Influenced Tectona grandis L. f. From Equatorial Indonesia: A Local Rainfall Amount and Remote ENSO Indicator.
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Nurhati, I. S., Evans, M. N., Cahyarini, S. Y., D'Arrigo, R. D., Yoshimura, K., and Herho, S. H. S.
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TEAK ,EL Nino ,SOUTHERN oscillation ,RAINFALL ,OCEAN temperature ,RADIATIVE forcing - Abstract
The hydroclimatic response of the El Niño‐Southern Oscillation (ENSO) to external radiative forcing remains controversial and difficult to project with confidence for the 21st century. Annually resolved paleoclimatic reconstructions spanning the pre‐ and post‐industrial eras from the Indonesian maritime continent may provide hindcasting and diagnostic targets. Here we report δ18O observations from dendrochronologically dated teak (Tectona grandis L. f.) α‐cellulose samples collected at Muna Island, Sulawesi (5.3°S, 123°E, elevation 10 m), for November‐April growing seasons during the period 1969/70–2004/5. Age‐modeled, annually averaged α‐cellulose δ18O anomalies are significantly correlated with simulated α‐cellulose δ18O at the study site. We show that the correlation is largely explained by the amount effect in local and regional precipitation δ18O. Significant correlation with SST anomalies over the study period suggest that replicated multicentury α‐cellulose records from this archive may be interpreted as ENSO indicators. Plain Language Summary: Does El Niño change when the energy balance of the climate is altered? This study sets the stage for addressing this question by developing an indirect record of El Niño from the oxygen isotopic composition of Indonesian trees growing adjacent to the warm equatorial western Pacific Ocean. The data are consistent with modeling of the record as a function of local precipitation amount, and the pattern of ocean surface temperature changes El Niño events produce. Extension of these records hundreds of years into the past should enable us to detect hypothesized changes in El Niño event occurrence over the recent geological past. Key Points: We developed a modern composite oxygen isotopic record from cross‐dated teak samples from Muna, Sulawesi (5.3°S, 123°E)Observations are consistent with data simulations, and a primary response to rainfall amountSignificantly correlated with ENSO, the data point to future analysis of its forced response and the unforced variation over centuries [ABSTRACT FROM AUTHOR]
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- 2024
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30. Vertical and horizontal distributions of 137Cs on paved surfaces affected by the Fukushima Dai-ichi Nuclear Power Plant accident
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Yoshimura, K., Watanabe, T., and Kurikami, H.
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- 2020
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31. Interannual controls on oxygen isotope variability in Asian monsoon precipitation and implications for paleoclimate reconstructions
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Yang, H, Johnson, KR, Griffiths, ML, and Yoshimura, K
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Earth Sciences ,Oceanography ,Physical Geography and Environmental Geoscience ,Climate Change Science ,Clinical Research ,Climate Action ,Atmospheric Sciences ,Atmospheric sciences ,Climate change science - Abstract
Orbital to millennial-scale variations in Asian monsoon speleothem δ18O have been widely interpreted as records of monsoon intensity and/or rainfall amount. To assess the influence of these and other mechanisms on higher-frequency δ18O variability, we utilize simulations from a spectrally nudged isotope-enabled general circulation model coupled with instrumental climate data to investigate the climatic controls on interannual precipitation δ18O (δ18Op) variability at four key cave locations affected by the Asian monsoon: Qunf Cave, Oman; Mawmluh Cave, India; Tham Mai Cave, Laos; and Dongge Cave, China. Comparison with instrumental climate data shows that interannual δ18Op variations are only weakly related to local precipitation amount at the four sites and are instead controlled primarily by large-scale monsoon intensity and upstream precipitation over the tropical Indo-Pacific region, which influence the δ18O of incoming moisture. Spatial correlations with sea surface temperature and precipitation, composite analyses, and time series analyses show that the El Niño-Southern Oscillation (ENSO) also plays a key role in modulating interannual precipitation δ18Op variability in the region, especially in northern India and Southeast Asia, with positive δ18Op anomalies during El Niño years reflecting increased contribution of high δ18O moisture from the nearby Bay of Bengal. Coherent interannual to decadal δ18O variations seen in high-resolution proxy records from across the Asian monsoon region, likely record monsoon intensity and upstream rainout, whereas ENSO related variability is likely to be strongest in records from northern India and Southeast Asia, with the largest anomalies expected when weak monsoons and El Niño occur together.
- Published
- 2016
32. Mapping bark bacteria: initial insights of stemflow-induced changes in bark surface phyla
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Hudson, J. E., primary, Levia, D. F., additional, Yoshimura, K. M., additional, Gottel, N. R., additional, Hudson, S. A., additional, and Biddle, J. F., additional
- Published
- 2023
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33. Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Ca$_x$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$
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Goh, S. K., Tompsett, D. A., Saines, P. J., Chang, H. C., Matsumoto, T., Imai, M., Yoshimura, K., and Grosche, F. M.
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Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
The quasi-skutterudite superconductor Sr$_3$Rh$_4$Sn$_{13}$ features a pronounced anomaly in electrical resistivity at $T^*\sim$138 K. We show that the anomaly is caused by a second-order structural transition, which can be tuned to 0 K by applying physical pressure and chemical pressure via the substitution of Ca for Sr. A broad superconducting dome is centred around the structural quantum critical point. Detailed analysis of the tuning parameter dependence of $T^*$ as well as insights from lattice dynamics calculations strongly support the existence of a structural quantum critical point at ambient pressure when the fraction of Ca is 0.9 (i.e., $x_c=0.9$). This establishes (Ca$_x$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$ series as an important system for exploring the physics of structural quantum criticality without the need of applying high pressures., Comment: 5 pages, 4 figures, accepted for publication in Phys. Rev. Lett
- Published
- 2014
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34. Magnetic phase diagram of Sr$_{1-x}$Ca$_x$Co$_2$P$_2$
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Sugiyama, J., Nozaki, H., Umegaki, I., Harada, M., Higuchi, Y., Ansaldo, E. J., Brewer, J. H., Imai, M., Michioka, C., Yoshimura, K., and Månsson, M
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Condensed Matter - Strongly Correlated Electrons - Abstract
In order to study the phase diagram from a microscopic viewpoint, we have measured wTF- and ZF-$\mu^+$SR spectra for the Sr$_{1-x}$Ca$_x$Co$_2$P$_2$ powder samples with $x=0$, 0.2, 0.4, 0.5, 0.6, 0.8, and 1. Due to a characteristic time window and spatial resolution of $\mu^+$SR, the obtained phase diagram was found to be rather different from that determined by magnetization measurements. That is, as $x$ increases from 0, a Pauli-paramagnetic phase is observed even at the lowest $T$ measured (1.8~K) until $x=0.4$, then, a spin-glass like phase appears at $0.5\leq x\leq0.6$, and then, a phase with wide field distribution probably due to incommensurate AF order is detected for $x=0.8$, and finally, a commensurate $A$-type AF ordered phase (for $x=1$) is stabilized below $T_{\rm N}\sim80~$K. Such change is most likely reasonable and connected to the shrink of the $c$-axis length with $x$, which naturally enhances the magnetic interaction between the two adjacent Co planes., Comment: 5 pages, 5 figures, conference paper of muSR2014 (accepted for publication)
- Published
- 2014
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35. Thorium isomer for radiative emission of neutrino pair
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Sasao, N., Uetake, S., Yoshimi, A., Yoshimura, K., and Yoshimura, M.
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High Energy Physics - Experiment ,High Energy Physics - Phenomenology ,Physics - Atomic Physics - Abstract
It is proposed to use the isomer ionic ground state $^{229m}$Th$^{4+}$ embedded in transparent crystals for precision determination of unknown neutrino parameters. Isolation from solid environment of the proposed nuclear process, along with available experimental techniques of atomic physics, has a great potentiality for further study.
- Published
- 2013
36. Evaluation of Exertional Ventilatory Parameters Using Oscillometry in COPD
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Yamamoto Y, Miki K, Matsuki T, Fukushima K, Oshitani Y, Kagawa H, Tsujino K, Yoshimura K, Miki M, and Kida H
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dyspnea ,dynamic hyperinflation ,airflow obstruction ,resonant frequency ,tidal volume ,Diseases of the respiratory system ,RC705-779 - Abstract
Yuji Yamamoto, Keisuke Miki, Takanori Matsuki, Kiyoharu Fukushima, Yohei Oshitani, Hiroyuki Kagawa, Kazuyuki Tsujino, Kenji Yoshimura, Mari Miki, Hiroshi Kida Department of Respiratory Medicine, National Hospital Organization Osaka Toneyama Medical Center, Osaka, JapanCorrespondence: Keisuke MikiDepartment of Respiratory Medicine, National Hospital Organization Osaka Toneyama Medical Center, 5-1-1 Toneyama, Toyonaka, Osaka 560-8552, JapanTel +81-6-6853-2001Fax +81-6-6853-3127Email miki.keisuke.pu@mail.hosp.go.jpBackground: Oscillometry is a tool to measure respiratory impedance that requires minimal patients’ effort. In patients with chronic obstructive pulmonary disease (COPD), the correlation of respiratory impedance at rest with exertional ventilatory parameters, including exercise tolerance, has scarcely been reported. In addition, the utility of oscillometric parameters might differ between the inspiratory and expiratory phases due to airflow obstruction during expiration, but the hypothesis had not been validated. The aim of the present study was to investigate whether oscillometric parameters are associated with exertional ventilatory parameters in patients with COPD.Methods: Fifty-five subjects with COPD who attended clinics at the National Hospital Organization Osaka Toneyama Medical Center performed spirometry, oscillometry, and cardiopulmonary exercise testing (CPET) within 2 weeks. The correlations between parameters of spirometry, oscillometry, and CPET were analyzed using Spearman’s rank correlation coefficient, univariate, and multivariate analyses.Results: Respiratory reactance had better correlations with the CPET parameters than respiratory resistance. Moreover, inspiratory reactance at rest correlated with the CPET parameters stronger than expiratory reactance. In particular, inspiratory resonant frequency (Fres-ins) correlated with peak oxygen uptake (rS=− 0.549, p< 0.01) and dead space to tidal volume ratio at peak exercise (rS=0.677, p< 0.01) and the best predicted expiratory tidal volume (VT ex) at peak exercise of all the oscillometric parameters (rS=− 0.679, p< 0.01). However, the correlation between Fres-ins and VT ex at peak exercise became weak in subjects with severe and very severe COPD during exercise.Conclusion: Measurement of respiratory reactance is useful for the effortless evaluation of not only exertional ventilatory parameters but exercise tolerance in patients with COPD. The correlation of respiratory impedance with exertional ventilatory parameters can become weak in patients with advanced COPD; thus, the measurement of oscillometry might not be appropriate for evaluating exertional ventilatory parameters of patients with advanced COPD.Keywords: dyspnea, dynamic hyperinflation, airflow obstruction, resonant frequency, tidal volume
- Published
- 2020
37. The importance of accounting for testing and positivity in surveillance by time and place : an illustration from HIV surveillance in Japan
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Kato, H., Kanou, K., Arima, Y., Ando, F., Matsuoka, S., Yoshimura, K., Matano, T., Matsui, T., Sunagawa, T., and Oishi, K.
- Published
- 2018
38. Corrigendum to "Spatial variation in turbulent heat fluxes in Drake Passage" [J. Climate, 2012, 25:1470-1488, doi:10.1175/2011JCLI4071.1]
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Jiang, C, Gille, ST, Sprintall, J, and Yoshimura, K
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Southern Ocean ,Annular mode ,Air-sea interaction ,Antarctic Oscillation ,Climate prediction ,Regression analysis ,Meteorology & Atmospheric Sciences ,Atmospheric Sciences ,Oceanography ,Geomatic Engineering - Published
- 2015
39. Introduction of Room Temperature Ferromagnetism in Nanocrystalline Samarium Oxide by Doping of Co-ion
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Mandal, J., Yoshimura, K., Sarkar, B. J., Deb, A. K., and Chakrabarti, P. K.
- Published
- 2019
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40. Microstructural analysis, optical and magnetic properties of nanocrystalline Ni doped Dy2O3
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Bhakta, N., Das, A., Das, D., Yoshimura, K., Bajorek, A., and Chakrabarti, P.K.
- Published
- 2019
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41. Energy response of X-rays under high flux conditions using a thin APD for the energy range of 6–33 keV
- Author
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Masuda, T., Hiraki, T., Kaino, H., Kishimoto, S., Miyamoto, Y., Okai, K., Okubo, S., Ozaki, R., Sasao, N., Suzuki, K., Uetake, S., Yoshimi, A., and Yoshimura, K.
- Published
- 2019
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42. Search for Antihelium with the BESS-Polar Spectrometer
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Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. BESS- Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit of 6.9 \times 10^-8 was determined by combining all the BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies from 1.6 to 14 GV, an upper limit of 1.0 \times 10^-7 was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date., Comment: 4 pages, 4 figures
- Published
- 2012
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43. MICE: the Muon Ionization Cooling Experiment. Step I: First Measurement of Emittance with Particle Physics Detectors
- Author
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Bravar, U., Bogomilov, M., Karadzhov, Y., Kolev, D., Russinov, I., Tsenov, R., Wang, L., Xu, F. Y., Zheng, S. X., Bertoni, R., Bonesini, M., Mazza, R., Palladino, V., Cecchet, G., de Bari, A., Capponi, M., Iaciofano, A., Orestano, D., Pastore, F., Tortora, L., Ishimoto, S., Suzuki, S., Yoshimura, K., Mori, Y., Kuno, Y., Sakamoto, H., Sato, A., Yano, T., Yoshida, M., Filthaut, F., Vretenar, M., Ramberger, S., Blondel, A., Cadoux, F., Masciocchi, F., Graulich, J. S., Verguilov, V., Wisting, H., Petitjean, C., Seviour, R., Ellis, M., Kyberd, P., Littlefield, M., Nebrensky, J. J., Forrest, D., Soler, F. J. P., Walaron, K., Cooke, P., Gamet, R., Alecou, A., Apollonio, M., Barber, G., Dobbs, A., Dornan, P., Fish, A., Hare, R., Jamdagni, A., Kasey, V., Khaleeq, M., Long, K., Pasternak, J., Sashalmi, T., Blackmore, V., Cobb, J., Lau, W., Rayner, M., Tunnell, C. D., Witte, H., Yang, S., Alexander, J., Charnley, G., Griffiths, S., Martlew, B., Moss, A., Mullacrane, I., Oats, A., York, S., Apsimon, R., Alexander, R. J., Barclay, P., Baynham, D. E., Bradshaw, T. W., Courthold, M., Hayler, R. Edgecock T., Hills, M., Jones, T., McCubbin, N., Murray, W. J., Nelson, C., Nicholls, A., Norton, P. R., Prior, C., Rochford, J. H., Rogers, C., Spensley, W., Tilley, K., Booth, C. N., Hodgson, P., Nicholson, R., Overton, E., Robinson, M., Smith, P., Adey, D., Back, J., Boyd, S., Harrison, P., Norem, J., Bross, A. D., Geer, S., Moretti, A., Neuffer, D., Popovic, M., Qian, Z., Raja, R., Stefanski, R., Cummings, M. A. C., Roberts, T. J., DeMello, A., Green, M. A., Li, D., Sessler, A. M., Virostek, S., Zisman, M. S., Freemire, B., Hanlet, P., Huang, D., Kafka, G., Kaplan, D. M., Snopok, P., Torun, Y., Onel, Y., Cline, D., Lee, K., Fukui, Y., Yang, X., Rimmer, R. A., Cremaldi, L. M., Hart, T. L., Summers, D. J., Coney, L., Fletcher, R., Hanson, G. G., Heidt, C., Gallardo, J., Kahn, S., Kirk, H., and Palmer, R. B.
- Subjects
Physics - Accelerator Physics ,High Energy Physics - Experiment - Abstract
The Muon Ionization Cooling Experiment (MICE) is a strategic R&D project intended to demonstrate the only practical solution to providing high brilliance beams necessary for a neutrino factory or muon collider. MICE is under development at the Rutherford Appleton Laboratory (RAL) in the United Kingdom. It comprises a dedicated beamline to generate a range of input muon emittances and momenta, with time-of-flight and Cherenkov detectors to ensure a pure muon beam. The emittance of the incoming beam will be measured in the upstream magnetic spectrometer with a scintillating fiber tracker. A cooling cell will then follow, alternating energy loss in Liquid Hydrogen (LH2) absorbers to RF cavity acceleration. A second spectrometer, identical to the first, and a second muon identification system will measure the outgoing emittance. In the 2010 run at RAL the muon beamline and most detectors were fully commissioned and a first measurement of the emittance of the muon beam with particle physics (time-of-flight) detectors was performed. The analysis of these data was recently completed and is discussed in this paper. Future steps for MICE, where beam emittance and emittance reduction (cooling) are to be measured with greater accuracy, are also presented., Comment: Proceedings of the DPF-2011 Conference, Providence, RI, August 8-13, 2011
- Published
- 2011
44. Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica
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Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shinoda, R., Streitmatter, R. E., Suzuki, J., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.
- Subjects
Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
The energy spectrum of cosmic-ray antiprotons from 0.17 to 3.5 GeV has been measured using 7886 antiprotons detected by BESS-Polar II during a long-duration flight over Antarctica near solar minimum in December 2007 and January 2008. This shows good consistency with secondary antiproton calculations. Cosmologically primary antiprotons have been investigated by comparing measured and calculated antiproton spectra. BESS-Polar II data show no evidence of primary antiprotons from evaporation of primordial black holes., Comment: 4 pages, 4 figures, submitted to Physical Review Letters
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- 2011
- Full Text
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45. Magnetic Phase Diagram of Alternating Chain Compound Pb2V3O9
- Author
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Nawa, K., Michioka, C., Yoshimura, K., Matsuo, A., and Kindo, K.
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Condensed Matter - Strongly Correlated Electrons - Abstract
Pb2V3O9 was found to have antiferromagnetic alternating chains of S=1/2 and show the antiferromagnetic long range ordered (AFLRO) state under the magnetic field between 4 and 38 T. We succeeded in growing single crystals of Pb2V3O9 by floating zone method and determined the asymmetric H-T phase diagram of Pb2V3O9 from measurements of the magnetization and the heat capacity. Previous reports focused on the AFLRO state in the low magnetic field region and that in high magnetic field region was not discussed so much. In this paper, we examined the AFLRO state in terms of the mean field theory and the picture of Bose-Einstein condensation of magnons to discuss the whole phase diagram. Consequently, the asymmetry of the phase boundary in Pb2V3O9 is explained by the mixing contribution of excited states and by interchain interactions., Comment: 14 pages, 14 figures
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- 2010
- Full Text
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46. The design, construction and performance of the MICE scintillating fibre trackers
- Author
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Ellis, M., Hobson, P. R., Kyberd, P., Nebrensky, J. J., Bross, A., Fagan, J., Fitzpatrick, T., Flores, R., Kubinski, R., Krider, J., Rucinski, R., Rubinov, P., Tolian, C., Hart, T. L., Kaplan, D. M., Luebke, W., Freemire, B., Wojcik, M., Barber, G., Clark, D., Clark, I., Dornan, P. J., Fish, A., Greenwood, S., Hare, R., Jamdagni, A., Kasey, V., Khaleeq, M., Leaver, J., Long, K. R., McKigney, E., Matsushita, T., Rogers, C., Sashalmi, T., Savage, P., Takahashi, M., Tapper, A., Yoshimura, K., Cooke, P., Gamet, R., Sakamoto, H., Kuno, Y., Sato, A., Yano, T., Yoshida, M., MacWaters, C., Coney, L., Hanson, G., Klier, A., Cline, D., Yang, X., and Adey, D.
- Subjects
Physics - Instrumentation and Detectors - Abstract
Charged-particle tracking in the international Muon Ionisation Cooling Experiment (MICE) will be performed using two solenoidal spectrometers, each instrumented with a tracking detector based on 350 {\mu}m diameter scintillating fibres. The design and construction of the trackers is described along with the quality-assurance procedures, photon-detection system, readout electronics, reconstruction and simulation software and the data-acquisition system. Finally, the performance of the MICE tracker, determined using cosmic rays, is presented., Comment: 43 pages, 38 figures
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- 2010
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47. Magnetic anomalies of hydrous cobaltate compound Na_x(H_3O)_zCoO_2 \cdot yH_2O detected by NMR and NQR measurements
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Ihara, Y., Takeya, H., Ishida, K., Yoshimura, K., Takada, K., Sasaki, T., Sakurai, H., and Takayama-Muromachi, E.
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Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
In order to investigate the relationship between superconductivity and magnetism in bilayer-hydrate cobaltate Na_x(H_3O)_zCoO_2 \cdot yH_2O, Co nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements were performed on three different samples, which demonstrate various ground states at low temperatures. The appearance of small internal fields is observed in the NQR spectra below approximately 6 K on one of the samples that possesses the largest c-axis length and the highest NQR frequency. The other two samples exhibit superconducting transition in zero magnetic field, while these two samples show different ground states in the magnetic fields greater than 5 T. The comparison of the NMR spectra of these two samples obtained in high magnetic fields reveals the appearance of static internal magnetic fields at the Co site below 4 K in the sample that possesses the intermediate c-axis length and the NQR frequency., Comment: 11 pages, 10 figures, accepted for publication in Phys. Rev. B
- Published
- 2009
- Full Text
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48. Antimony from brake dust to the combined sewer collection system via road effluent under rainy conditions
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Ozaki, H., Yoshimura, K., Asaoka, Y., and Hayashi, S.
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- 2021
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49. 137Cs contamination of Japanese mustard spinach by resuspended particles in areas with different contamination conditions.
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Tatsuno, T., Yoshimura, K., and Nihei, N.
- Subjects
- *
JAPANESE language , *CESIUM , *MUSTARD , *SPINACH , *WEATHER - Abstract
We investigated cesium-137 (137Cs) transfer to Japanese mustard spinaches (spinach) due to resuspended particles across the multiple sites in Fukushima Prefecture, Japan. At a site located in difficult-to-return zone, 137Cs deposition in pots placed near the ground increased. However, there was no significant difference in the amount of 137Cs in spinach placed near the ground and those placed far from the ground. 137Cs adsorption to the spinach was less than 10% of the 137Cs deposition at each study site. For future study, it is necessary to evaluate the effects of weather and growth conditions on 137Cs absorption to the spinach. [ABSTRACT FROM AUTHOR]
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- 2024
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50. Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li7RuO6 via 7Li NMR
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Itoh, Y., Michioka, C., Yoshimura, K., Nakajima, K., and Sato, H.
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Materials Science - Abstract
We report 7Li NMR studies of single crystals of triangular-lattice Heisenberg antiferromagnet Li7RuO6. Slow critical divergence with a wide critical region of |T/TN - 1|< 7 was observed in 7Li nuclear spin-lattice relaxation rate. The slowing down of staggered spin fluctuations was analyzed in a renormalized classical region of a two-dimensional triangular-lattice non-linear sigma model. A spin stiffness constant was found to reduce to about 20 % from the value in a spin-wave approximation. The effect of spin frustration, e.g., Z2 vortex excitations on the critical phenomena is suggested., Comment: 4 pages, 5 figures, the references were updated, to be published in J. Phys. Soc. Jpn. 78 (2009) No.2
- Published
- 2008
- Full Text
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