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Neutrino masses from cosmological probes in interacting neutrino dark-energy models
Ichiki, Kiyotomo,Keum, Yong-Yeon IOP Publishing Ltd 2008 Journal of high energy physics Vol.2008 No.6
We investigate whether interaction between massive neutrinos and quintessence scalar field is the origin of the late time accelerated expansion of the universe. We present explicit formulas of the cosmological linear perturbation theory in the neutrinos probes of dark-energy model, and calculate cosmic microwave background anisotropies and matter power spectra. In these models, the evolution of the mass of neutrinos is determined by the quintessence scalar field, which is responsible for a varying effective equation of states; ω<SUB>eff</SUB>(<I>z</I>) goes down lesser than -1. We consider several types of scalar field potential and put constraints on the coupling parameter between neutrinos and dark energy. By combining data from cosmic microwave background (CMB) experiments including the WMAP 3-year results, large scale structure with 2dFGRS data sets, we constrain the hypothesis of massive neutrinos in the mass-varying neutrino scenario. Assuming the flatness of the universe, the constraint we can derive from the current observation is ∑<I>m</I><SUB>ν</SUB> < 0.45 eV at 1σ (0.87 eV at 2σ) confidence level for the sum over three species of neutrinos. The dynamics of scalar field and the impact of scalar field perturbations on cosmic microwave background anisotropies are discussed. We also discuss on the instability issue and confirm that neutrinos are stable against the density fluctuation in our model.
Development of living body information and behavior monitoring system for nursing person
Ichiki, Ai,Sakamoto, Hidetoshi,Ohbuchi, Yoshifumi Korean Society for Engineering Education 2014 공학교육연구 Vol.17 No.4
The non-contact easy detecting system of nursing person's body vital information and their behaviors monitoring system are developed, which consist of "Kinect" sensor and thermography camera. The "Kinect" sensor can catch the body contour and the body moving behavior, and output their imaging data realtime. The thermography camera can detect respiration state and body temperature, etc. In this study, the practicability of this system was verified.
Development of living body information and behavior monitoring system for nursing person
Ai Ichiki,Hidetoshi Sakamoto,Yoshifumi Ohbuchi 한국공학교육학회 2014 공학교육연구 Vol.17 No.4
The non-contact easy detecting system of nursing person's body vital information and their behaviors monitoring system aredeveloped, which consist of “Kinect” sensor and thermography camera. The “Kinect” sensor can catch the body contour and thebody moving behavior, and output their imaging data realtime. The thermography camera can detect respiration state and bodytemperature, etc. In this study, the practicability of this system was verified.
Surface Hardening of Titanium Using Gas Nitriding
Masashi Yoshida,Ryuta Ichiki,Noah Utsumi 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
In this study, a rotary barrel tank was employed with gas nitriding in an attempt to form a hard layer on the surface of pure titanium. Nitriding was carried out at 773 K to 1073 K for 3.6 ks to 32.4 ks. Alumina powders were used as the media that flowed in the barrel tank. A new surface hardening process was developed for forming hard layers on a pure titanium surface. A uniform hard layer could be formed on pure titanium surfaces using barrel nitriding. With barrel nitriding, the treatment time did not have an effect on the surface hardness, but had a strong effect on the depth of the hard layer. Moreover, nitrogen was able to diffuse into titanium surface,and TiN and Ti2N could be formed on the surface using this process.
Progress and prospects in nanoscale dry processes: How can we control atomic layer reactions?
Ishikawa, Kenji,Karahashi, Kazuhiro,Ichiki, Takanori,Chang, Jane P.,George, Steven M.,Kessels, W. M. M.,Lee, Hae June,Tinck, Stefan,Um, Jung Hwan,Kinoshita, Keizo Institute of Pure and Applied Physics 2017 Japanese Journal of Applied Physics Vol. No.
<P>In this review, we discuss the progress of emerging dry processes for nanoscale fabrication. Experts in the fields of plasma processing have contributed to addressing the increasingly challenging demands in achieving atomic-level control of material selectivity and physicochemical reactions involving ion bombardment. The discussion encompasses major challenges shared across the plasma science and technology community. Focus is placed on advances in the development of fabrication technologies for emerging materials, especially metallic and intermetallic compounds and multiferroic, and two-dimensional (2D) materials, as well as state-of-the-art techniques used in nanoscale semiconductor manufacturing with a brief summary of future challenges. (C) 2017 The Japan Society of Applied Physics</P>