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1,269 results on '"Takenaka, H."'

3. Positron potential and wavefunction in LaFeAsO

Author

Takenaka, H. and Singh, D. J.

Subjects
Condensed Matter - Superconductivity
Abstract

We report calculations of the positron potential and wavefunction in LaFeAsO. These calculations show that the positron wavefunction does sample the entire unit cell although it is largest in the interstices of the La layer adjacent to As atoms. The implication is that angular correlation of annihilation radiation (ACAR) is a viable probe of the Fermi surfaces in this material. The results also apply to positive muons, and indicate that these will be localized in the La layer adjacent to As.

Published
2008
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4. Bonding of H in O vacancies of ZnO

Author

Takenaka, H. and Singh, D. J.

Subjects
Condensed Matter - Materials Science
Abstract

We investigate the bonding of H in O vacancies of ZnO using density functional calculations. We find that H is anionic and does not form multicenter bonds with Zn in this compound.

Published
2007

6. Coupled polarization and nanodomain evolution underpins large electromechanical responses in relaxors

Author

Kim, J, Kim, J, Kumar, A, Qi, Y, Takenaka, H, Ryan, PJ, Meyers, D, Kim, JW, Fernandez, A, Tian, Z, Rappe, AM, LeBeau, JM, Martin, LW, Kim, J, Kim, J, Kumar, A, Qi, Y, Takenaka, H, Ryan, PJ, Meyers, D, Kim, JW, Fernandez, A, Tian, Z, Rappe, AM, LeBeau, JM, and Martin, LW

Abstract

Understanding the evolution and role of nanoscale polar structures during polarization rotation in relaxor ferroelectrics is a long-standing challenge in materials science and condensed-matter physics. These nanoscale polar structures are characterized by polar nanodomains, which are believed to play a key role in enabling the large susceptibilities of relaxors. Using epitaxial strain, we stabilize the intermediate step during polarization rotation in epitaxial films of a prototypical relaxor and study the co-evolution of polarization and polar nanodomains. Our multimodal approach allows for a detailed examination of correlations between polarization and polar nanodomains; illuminates the effect of local chemistry, strain and electric field on their co-evolution; and reveals the underappreciated role of strain in enabling the large electromechanical coupling in relaxors. As the strain increases, the competition between chemistry-driven disorder and strain-driven order of the polar units intensifies, which is manifested in the coexistence of inclined and elongated polar nanodomains in the intermediate step of polarization rotation. Our findings establish that structural transitions between polar nanodomain configurations underpins the polarization rotation and large electromechanical coupling of relaxors.

Published
2022

7. Search for proton decay via p -> μ+K0 in 0.37 megaton-years exposure of Super-Kamiokande

Author

Super-Kamiokande Collaboration: R. Matsumoto, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe

Published
2022
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14. Edaravone (MCI-186) is effective as a free radical scavenger following arteriovenous sheathotomy for treatment of macular oedema associated with branch retinal vein occlusion

Author

Maeno, T., Tano, R., Takenaka, H., and Mano, T.

Subjects
Antioxidants -- Dosage and administration, Antioxidants -- Research, Eye diseases -- Care and treatment, Eye diseases -- Research, Retinal diseases -- Care and treatment, Retinal diseases -- Research, Eye -- Surgery, Eye -- Patient outcomes, Eye -- Research, Health
Published
2009

21. Planar shock wave generated by uniform irradiation from two overlapped partially coherent laser beams

Author

Ozaki, N., Sasatani, Y., Kishida, K., Nakano, M., Miyanaga, M., Nagai, K., Nishihara, K., Norimatsu, T., Tanaka, K.a., Fujimoto, Y., Wakabayashi, K., Hattori, S., Tange, T., Kondo, K., Yoshida, M., Kozu, N., Ishiguchi, M., and Takenaka, H.

Subjects
Irradiation -- Usage, Laser beams -- Usage, Physics
Abstract

A new laser irradiation method is proposed to produce uniform laser irradiation of target or flyer plates.

Published
2001

24. Flyer acceleration by a high-power KrF laser with a long pulse duration

Author

Kadono, T., Yoshida, M., Takahashi, E., Matsushima, I., Owadano, Y., Ozaki, N., Fukita, K., Nakano, M., Tanaka, K.A., Takenaka, H., and Kondo, K.

Subjects
Irradiation -- Usage, Laser materials, Effect of radiation on -- Research, Physics
Abstract

High power laser irradiation using the ASHURA system is described.

Published
2000

25. Configuration of dislocations in lateral overgrowth GaN films

Author

Hao, M., Mahanty, S., Sugahara, T., Morishima, Y., Takenaka, H., Wang, J., Tottori, S., Nishino, K., Naoi, Y., and Sakai, S.

Subjects
Dislocations in crystals -- Research, Gallium nitrate -- Research, Thin films -- Research, Transmission electron microscopes -- Usage, Cathodoluminescence -- Usage, Physics
Abstract

Research was conducted to examine the configuration of dislocations in lateral overgrowth GaN films. Transmission electron microscopy and cathodoluminescence were used to investigate the microstructure of sublimation lateral overgrowth GaN. Results demonstrate that the dislocations also affect the yellow emission and not just the band edge emission. The dislocations were also shown to propagate laterally in the overgrowth region.

Published
1999

44. Large-area, high-resolution pattern replication by the use of a two-aspherical-mirror system

Author

Kinoshita, H., Kurihara, K., Mizota, T., Haga, T., Takenaka, H., and Torii, Y.

Subjects
X-ray lithography -- Research, Mirrors -- Usage, Optics -- Research, Astronomy, Physics
Abstract

A soft-x-ray projection lithography system is developed by the use of multilayer mirrors. To determine the feasibility of a high throughput and a large exposure area, we developed a reduction system that consists of two-aspherical-mirror optics. The figure errors of aspherical mirrors are evaluated by a laser interferometer. The rms aspherical figure errors of concave and convex mirrors are 8.8 and 2.0 nm, respectively, which are not enough to yield a resolution of 0.1 micrometer. The reduction optics is constructed by adjusting the mirror position to compensate for aberrations, and some trial replications are performed. An exposure area of larger than 10 mm X 0.6 mm with a fine pattern of less than a quarter micrometer is achieved.

Published
1993

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