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Search Results: 1 - 10 of 118331 matches for " Ota T "
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Matter profile effect in neutrino factory
T. Ota,J. Sato
Physics , 2000, DOI: 10.1103/PhysRevD.63.093004
Abstract: We point out that the matter profile effect --- the effect of matter density fluctuation on the baseline --- is very important to estimate the parameters in a neutrino factory with a very long baseline. To make it clear, we propose the method of the Fourier series expansion of the matter profile. By using this method, we can take account of both the matter profile effect and its ambiguity. For very long baseline experiment, such as L=7332km, in the analysis of the oscillation phenomena we need to introduce a new parameter $ a_{1} $--- the Fourier coefficient of the matter profile --- as a theoretical parameter to deal with the matter profile effects.
Calibration of GaAlAs Semiconductor Diode  [PDF]
S. B. Ota, Smita Ota
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310184
Abstract: The forward voltage of GaAlAs semiconductor diode has been measured in the temperature range 50 K - 300 K and for current values between 10 nA and 450 μA. The forward voltage as a function of temperature is least-squares fitted and the coefficients are given. The 1st and 2nd order least-squares fitting has high temperature root between 400 K and 950 K. The presence of the high temperature root indicates that the fitted polynomials are of similar character. The high temperature root is found to increase for the least squares fitted polynomials corresponding to higher current values.
Nature of First-Order Transition in Planar Rotator Model with Modified Potential  [PDF]
Smita Ota, Snehadri Bihari Ota
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41020
Abstract:

We have carried out micro-canonical Monte Carlosimulations of a planar rotator model in 30 × 30 lattice using periodic boundary conditions. The energy distribution of the rotator in the lattice shows features that can be associated with spin wave and vortex excitations. The results supplement the first-order transition observed in canonicalMonte Carlosimulation, due to vortex nucleation. We also see features that can be associated with the in-homogeneity of vortex charge in the critical region.

Liquid Crystal Analogue of Abrikosov Vortex Flow in Superconductors
A. Tanaka,T. Ota,R. Hayakawa
Physics , 1996,
Abstract: We extend the correspondence between the Renn-Lubensky Twist-Grain-Boundary-A phase in chiral liquid crystals and the Abrikosov mixed state in superconductors to dynamical aspects. We find that for a TGB sample with free boundaries, an external electric field applied along the helical axis induces a uniform translational motion of the grain boundary system - an analogue of the well-known mixed state flux flow. Likewise, an analogue of the mixed state Nernst effect is found. In much the same way in which the flux flow carries intercore electric fields generating Joule heat in an otherwise dissipation-free system, the grain boundary flow carries along polarized charges, resulting in a finite electric conductivity in a ferroelectric.
Ambiguities of theoretical parameters and CP/T violation in neutrino factories
M. Koike,T. Ota,J. Sato
Physics , 2001,
Abstract: We study the optimal setup for observation of the CP asymmetry in neutrino factory experiments --- the baseline length, the muon energy and the analysis method. First, we point out that the statistical quantity which has been used in previous works doesn't represent the CP asymmetry. Then we propose the more suitable quantity, $\equiv \chi^{2}_{2} $, which is sensitive to the CP asymmetry. We investigate the behavior of $ \chi^{2}_{2} $ with ambiguities of the theoretical parameters. The fake CP asymmetry due to the matter effect increases with the baseline length and hence the error in the estimation of the fake CP asymmetry grows with the baseline length due to the ambiguities of the theoretical parameters. Namely, we lose the sensitivity to the genuine CP-violation effect in longer baseline.
Ambiguities of theoretical parameters and CP/T violation in neutrino factories
M. Koike,T. Ota,J. Sato
Physics , 2000, DOI: 10.1103/PhysRevD.65.053015
Abstract: We study the sensitivity to the CP/T-violation search in the presence of ambiguities of the theoretical parameters. Three generations of neutrinos are considered. The parameters whose ambiguities are considered are the differences of the squared masses, the mixing angles, and the density of matter. We first consider the statistics that are sensitive to the genuine CP-violation effect originating from the imaginary coupling. No ambiguity of the parameters is considered in this part. It is argued that the widely-adopted usual statistics are not necessarily sensitive to the genuine CP-violation effect. Two statistics that are sensitive to the imaginary coupling are proposed. The qualitative difference between these statistics and the usual one are discussed. Next we proceed to the case where the ambiguity of the parameters is present. The sensitivity of the CP-violation search is greatly spoiled when the baseline length is longer than about one thousand kilometers, which turns out to be due to the ambiguity of the matter effect. Thus the CP-violation search by use of CP conjugate channels turns out to require a low energy neutrino and short baseline length. It is also shown that such a loss of sensitivity is avoided by using T-conjugate oscillation channels.
O(alpha_s^2) Corrections to e+e- to ttbar Total and Differential Cross Sections Near Threshold
T. Nagano,A. Ota,Y. Sumino
Physics , 1999, DOI: 10.1103/PhysRevD.60.114014
Abstract: Recently full O(alpha_s^2, alpha_s*beta, beta^2) corrections to the threshold total cross section for e+e- to ttbar have been calculated, and the reported corrections turned out to be unexpectedly large. We study how to reduce theoretical uncertainties of the cross section. We adopt a new mass definition proposed by Beneke, which incorporates a renormalon-pole cancellation in the total energy of a static quark-antiquark pair. This improves the convergence of the 1S resonance mass, while the normalization of the cross section scarcely changes. We argue that resummations of logarithms are indispensable, since two largely separated scales dictate the shape of the cross section. As a first step, we resum logarithms in the Coulombic part of the t-tbar potential and observe a considerable improvement in the convergence of corresponding corrections. There still remain, however, large corrections, which arise from a 1/r^2 term in the ttbar potential. We also calculate full O(alpha_s^2, alpha_s*beta, beta^2) corrections to the momentum distributions of top quarks in the threshold region. Corrections to the distribution shape are small on the 1S resonance. At higher energies, corrections become larger.
Medial blepharosynechioplasty: a new surgical concept for severe dry eye
Sasaki T, Ota T, Ookura Y, Sugiyama K
Clinical Ophthalmology , 2012, DOI: http://dx.doi.org/10.2147/OPTH.S31001
Abstract: ial blepharosynechioplasty: a new surgical concept for severe dry eye Original Research (1976) Total Article Views Authors: Sasaki T, Ota T, Ookura Y, Sugiyama K Published Date June 2012 Volume 2012:6 Pages 963 - 965 DOI: http://dx.doi.org/10.2147/OPTH.S31001 Received: 18 February 2012 Accepted: 02 April 2012 Published: 22 June 2012 Tsugihisa Sasaki,1,2 Taeko Ota,3 Youko Ookura,4 Kazuhisa Sugiyama1 1Department of Ophthalmology, Kanazawa University School of Medicine, Kanazawa, Ishikawa; 2Department of Ophthalmology, Fukui Prefectural Hospital, Fukui; 3Department of Ophthalmology, Tonami General Hospital, Tonami-city, Toyama; 4Department of Ophthamology, Saiseikai Kanazawa Hospital, Kanazawa, Ishikawa, Japan Background: The purpose of this work was to report on the performance of medial blepharosynechioplasty (MBSP), a newly devised technique for treating severe dry eye. Methods: In this retrospective, nonrandomized clinical trial, three cases with severe dry eye (Sj gren’s syndrome) associated with repeated punctal plug loss were treated using MBSP to create a synechia between the upper and lower lid medial borders of the puncta to suppress the lacrimal pump. Results: Postoperative follow-up showed improvement in the corneal condition in all three cases that persisted for 12–35 months. None of the patients had visual impairment. Conclusion: MBSP is a promising treatment for severe dry eye and merits further study.
Medial blepharosynechioplasty: a new surgical concept for severe dry eye
Sasaki T,Ota T,Ookura Y,Sugiyama K
Clinical Ophthalmology , 2012,
Abstract: Tsugihisa Sasaki,1,2 Taeko Ota,3 Youko Ookura,4 Kazuhisa Sugiyama11Department of Ophthalmology, Kanazawa University School of Medicine, Kanazawa, Ishikawa; 2Department of Ophthalmology, Fukui Prefectural Hospital, Fukui; 3Department of Ophthalmology, Tonami General Hospital, Tonami-city, Toyama; 4Department of Ophthamology, Saiseikai Kanazawa Hospital, Kanazawa, Ishikawa, JapanBackground: The purpose of this work was to report on the performance of medial blepharosynechioplasty (MBSP), a newly devised technique for treating severe dry eye.Methods: In this retrospective, nonrandomized clinical trial, three cases with severe dry eye (Sj gren’s syndrome) associated with repeated punctal plug loss were treated using MBSP to create a synechia between the upper and lower lid medial borders of the puncta to suppress the lacrimal pump.Results: Postoperative follow-up showed improvement in the corneal condition in all three cases that persisted for 12–35 months. None of the patients had visual impairment.Conclusion: MBSP is a promising treatment for severe dry eye and merits further study.Keywords: dry eye, lacrimal pump suppression, medial blepharosynechioplasty
Subfoveal serous retinal detachment associated with extramacular branch retinal vein occlusion
Ota T,Tsujikawa A,Murakami T,Ogino K
Clinical Ophthalmology , 2013,
Abstract: Toru Ota, Akitaka Tsujikawa, Tomoaki Murakami, Ken Ogino, Yuki Muraoka, Kyoko Kumagai, Yumiko Akagi-Kurashige, Kazuaki Miyamoto, Nagahisa YoshimuraDepartment of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, JapanPurpose: To study the pathophysiology of subfoveal serous retinal detachment (SRD) observed in eyes with extramacular branch retinal vein occlusion (BRVO).Methods: We retrospectively reviewed the medical records of nine patients (nine eyes) with extramacular BRVO with macular complications that were examined using optical coherence tomography (OCT).Results: Extramacular BRVO was observed in the inferior area in three eyes, in the superior area in five eyes, and in the nasal area in one eye. Visual acuity was moderately disturbed (median, 0.6; range, 0.2–0.9, measured using the Landolt chart). One eye showed extensive SRD that was connected to the area affected by BRVO through the subretinal space. In eight of the eyes, focal SRD was observed beneath the fovea without subretinal connections to the area affected by BRVO. However, all these eyes showed marked retinal swelling in the outer retina, particularly in the outer plexiform layer. In two of the eyes, detailed OCT examinations showed a small break on the external surface of the retina connecting the swollen outer retina with the underlying SRD. All eyes showed hyperreflective foci in the outer retina, most frequently along the inner boundary of the outer plexiform layer and external limiting membrane.Conclusion: Extramacular BRVO is often accompanied by focal SRD beneath the fovea. Leakage from the retinal capillaries affected by BRVO travelled via the outer plexiform layer and caused SRD under the fovea.Keywords: branch retinal vein occlusion, extramacular, macular edema, optical coherence tomography, retinal detachment
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