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3,526 results on '"Ohkubo T"'

1. Finite element method modeling of expansion of irradiated rocks: focusing on the minerals

Author

Oida, Y., Sakuragi, S., Igari, T., Nakajima, Y., Ro, E., Shimizu, F., Futami, M., Hakozaki, Y., Ohkubo, T., Ishikawa, H., Takada, S., Sawada, S., Murakami, K., Suzuki, K., and Maruyama, I.

Subjects
Physics - Geophysics
Abstract

Finite element method (FEM) modeling of the volumetric expansion phenomenon associated with the accumulation of irradiation was performed on rocks in a concrete for nuclear power plant. The FEM mesh of sandstone, tuff, and granite was created based on microscopic images, and the volumetric expansion due to irradiation was calculated. The saturated value of the volume expansion due to irradiation accumulation was calculated, and it was shown that the saturated value of the volume expansion was well explained by the experimental value. In addition, the FEM analysis indicates that irradiation-induced degradation of rock propagates through a localized concentration of stress followed by fracture with cracks spreading throughout the rock., Comment: 5 pages, 4 figures

Published
2022

4. Observation of Nonlinear Spin-Charge Conversion in the Thin Film of Nominally Centrosymmetric Dirac Semimetal SrIrO3 at Room Temperature

Author

Kozuka, Y., Isogami, S., Masuda, K., Miura, Y., Das, Saikat, Fujioka, J., Ohkubo, T., and Kasai, S.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

Spin-charge conversion via spin-orbit interaction is one of the core concepts in the current spintronics research. The efficiency of the interconversion between charge and spin current is estimated based on Berry curvature of Bloch wavefunction in the linear-response regime. Beyond the linear regime, nonlinear spin-charge conversion in the higher-order electric field terms has recently been demonstrated in noncentrosymmetric materials with nontrivial spin texture in the momentum space. Here we report the observation of the nonlinear charge-spin conversion in a nominally centrosymmetric oxide material, SrIrO3, by breaking inversion symmetry at the interface. A large second-order magnetoelectric coefficient is observed at room temperature because of the antisymmetric spin-orbit interaction at the interface of Dirac semimetallic bands, which is subject to the symmetry constraint of the substrates. Our study suggests that nonlinear spin-charge conversion can be induced in many materials with strong spin-orbit interaction at the interface by breaking the local inversion symmetry to give rise to spin splitting in otherwise spin degenerate systems., Comment: 34 pages, 1 table, 13 figures

Published
2021
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16. Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets

Author

Fischbacher, J., Kovacs, A., Kühnel, L. Exl J., Mehofer, E., Sepehri-Amin, H., Ohkubo, T., Hono, K., and Schrefl, T.

Subjects
Condensed Matter - Materials Science
Abstract

Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd2Fe14B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.

Published
2018
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17. Blood pressure-lowering treatment for prevention of major cardiovascular diseases in people with and without type 2 diabetes: an individual participant-level data meta-analysis

Author

Agodoa, L, Algra, A, Asselbergs, F W, Beckett, N, Berge, E, Black, H, Brouwers, F P J, Brown, M, Bulpitt, C J, Byington, B, Cutler, J, Devereaux, R B, Dwyer, J, Estacio, R, Fagard, R, Fox, K, Fukui, T, Imai, Y, Ishii, M, Julius, S, Kanno, Y, Kjeldsen, S E, Kostis, J, Kuramoto, K, Lanke, J, Lewis, E, Lewis, J, Lievre, M, Lindholm, L H, Lueders, S, MacMahon, S, Mancia, G, Matsuzaki, M, Mehlum, M H, Nissen, S, Ogawa, H, Ogihara, T, Ohkubo, T, Palmer, C, Patel, A, Pfeffer, M, Poulter, N R, Rakugi, H, Reboldi, G, Reid, C, Remuzzi, G, Ruggenenti, P, Saruta, T, Schrader, J, Schrier, R, Sever, P, Sleight, P, Staessen, J A, Suzuki, H, Thijs, L, Ueshima, K, Umemoto, S, van Gilst, W H, Verdecchia, P, Wachtell, K, Whelton, P, Wing, L, Yui, Y, Yusuf, S, Zanchetti, A, Zhang, Z Y, Anderson, C, Baigent, C, Brenner, BM, Collins, R, de Zeeuw, D, Lubsen, J, Malacco, E, Neal, B, Perkovic, V, Pitt, B, Rodgers, A, Rothwell, P, Salimi-Khorshidi, G, Sundström, J, Turnbull, F, Viberti, G, Wang, J, Nazarzadeh, Milad, Bidel, Zeinab, Canoy, Dexter, Copland, Emma, Bennett, Derrick A, Dehghan, Abbas, Davey Smith, George, Holman, Rury R, Woodward, Mark, Gupta, Ajay, Adler, Amanda I, Wamil, Malgorzata, Sattar, Naveed, Cushman, William C, McManus, Richard J, Teo, Koon, Davis, Barry R, Chalmers, John, Pepine, Carl J, and Rahimi, Kazem

Published
2022
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29. Antihypertensive treatment and risk of cancer: an individual participant data meta-analysis

Author

Adler, A, Agodoa, L, Algra, A, Asselbergs, F W, Beckett, N, Berge, E, Black, H, Brouwers, F P J, Brown, M, Bulpitt, C J, Byington, B, Chalmers, J, Cushman, W C, Cutler, J, Davis, B R, Devereaux, R B, Dwyer, J, Estacio, R, Fagard, R, Fox, K, Fukui, T, Gupta, A K, Holman, R R, Imai, Y, Ishii, M, Julius, S, Kanno, Y, Kjeldsen, S E, Kostis, J, Kuramoto, K, Lanke, J, Lewis, E, Lewis, J, Lievre, M, Lindholm, L H, Lueders, S, MacMahon, S, Mancia, G, Matsuzaki, M, Mehlum, M H, Nissen, S, Ogawa, H, Ogihara, T, Ohkubo, T, Palmer, C, Patel, A, Pepine, C J, Pfeffer, M, Poulter, N R, Rakugi, H, Reboldi, G, Reid, C, Remuzzi, G, Ruggenenti, P, Saruta, T, Schrader, J, Schrier, R, Sever, P, Sleight, P, Staessen, J A, Suzuki, H, Thijs, L, Ueshima, K, Umemoto, S, van Gilst, W H, Verdecchia, P, Wachtell, K, Whelton, P, Wing, L, Woodward, M, Yui, Y, Yusuf, S, Zanchetti, A, Zhang, Z Y, Anderson, C, Baigent, C, Brenner, BM, Collins, R, de Zeeuw, D, Lubsen, J, Malacco, E, Neal, B, Perkovic, V, Pitt, B, Rodgers, A, Rothwell, P, Salimi-Khorshidi, G, Sundström, J, Turnbull, F, Viberti, G, Wang, J, Copland, Emma, Canoy, Dexter, Nazarzadeh, Milad, Bidel, Zeinab, Ramakrishnan, Rema, Woodward, Mark, Chalmers, John, Teo, Koon K, Pepine, Carl J, Davis, Barry R, Kjeldsen, Sverre, Sundström, Johan, and Rahimi, Kazem

Published
2021
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44. Ectopic cardiovascular fat in middle-aged men: effects of race/ethnicity, overall and central adiposity. The ERA JUMP study

Author

El Khoudary, SR, Shin, C, Masaki, K, Miura, K, Budoff, M, Edmundowicz, D, Kadowaki, S, Barinas-Mitchell, E, El-Saed, A, Fujiyoshi, A, Evans, RW, Hisamatsu, T, Ohkubo, T, Willcox, BJ, Kuller, LH, Ueshima, H, and Sekikawa, A

Subjects
Epidemiology, Public Health, Health Sciences, Heart Disease, Cardiovascular, Nutrition, Aging, Prevention, Obesity, Adiponectin, Black or African American, Asian, Asian People, Body Mass Index, Coronary Disease, Humans, Insulin Resistance, Male, Middle Aged, Multidetector Computed Tomography, Obesity, Abdominal, Risk Factors, Waist Circumference, White People, ERA JUMP Study Group, Medical and Health Sciences, Education, Endocrinology & Metabolism, Biomedical and clinical sciences, Health sciences
Abstract

Background/objectivesHigher volumes of ectopic cardiovascular fat (ECF) are associated with greater risk of coronary heart disease (CHD). Identifying factors that are associated with ECF volumes may lead to new preventive efforts to reduce risk of CHD. Significant racial/ethnic differences exist for overall and central adiposity measures, which are known to be associated with ECF volumes. Whether racial/ethnic differences also exist for ECF volumes and their associations with these adiposity measures remain unclear.Subjects/methodsBody mass index (BMI), computerized tomography-measured ECF volumes (epicardial, pericardial and their summation) and visceral adipose tissue (VAT) were examined in a community-based sample of 1199 middle-aged men (24.2% Caucasians, 7.0% African-Americans, 23.6% Japanese-Americans, 22.0% Japanese, 23.2% Koreans).ResultsSignificant racial/ethnic differences existed in ECF volumes and their relationships with BMI and VAT. ECF volumes were the highest among Japanese-Americans and the lowest among African-Americans. The associations of BMI and VAT with ECF differed by racial/ethnic groups. Compared with Caucasians, for each 1-unit increase in BMI, African-Americans had lower, whereas Koreans had higher increases in ECF volumes (P-values

Published
2015

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