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Origin of the ferromagnetism in ZnCoO from chemical reaction of Co<sub>3</sub>O<sub>4</sub>
Lee, S.,Kim, B.S.,Chan Cho, Y.,Shin, J.M.,Seo, S.W.,Cho, C.R.,Takeuchi, I.,Jeong, S.Y. Elsevier 2013 Current Applied Physics Vol.13 No.9
We investigated conversion of Co<SUB>3</SUB>O<SUB>4</SUB> to Co nanoclusters through hydrogen reduction. Quantitative analysis is performed on the conversion of Co<SUB>3</SUB>O<SUB>4</SUB> to Co metal as a function of hydrogen-injection conditions. Our results reveal that Co<SUB>3</SUB>O<SUB>4</SUB> must be completely eliminated to avoid formation of the metal phase in ZnCoO. We also propose a new M-T curve based method for detecting nano-sized Co clusters which are below the detection limit of diffraction techniques. It is also found that the Co phase can be transformed back to the Co<SUB>3</SUB>O<SUB>4</SUB> phase through oxygen annealing and that, as a result, the ferromagnetism can be eliminated. These findings are discussed in the context of the origin of ferromagnetism in ZnCoO.
핸드볼 선수의 체력에 관한 연구 : 전일본선수와 일체대선수의 형태, 체력의 비교
申吉洙,竹內正雄,阿部德之助,北川勇喜,松井幸嗣,森川壽人,西山逸成 圓光大學校 附設 體力科學硏究所 1989 體力科學硏究 Vol.11 No.-
The purpose of the study was to find the structure andfunctionpattern of Japan handball players. The result of these tests are shown on the followings. 1. Between the body height and body weight, Japan player is significantly higer than that of physical education's player in Japan. From the statistically, Japan Physical education player is lower than that of player in Japan. 2. Between flexion strength of upper-arm and fore-arm circumference, Japan physical education player is lower than that of player in Japan. 3. Among the back strength, ball-speed, maximum oxygen uptake, Japan physical education player is lower than that of players in Japan. 4. Between the 12minute-run and gripping strength, Japan player is the same that of physical education colleage's player in Japan.
DETECTION OF THE COSMIC FAR-INFRARED BACKGROUND IN AKARI DEEP FIELD SOUTH
Matsuura, S.,Shirahata, M.,Kawada, M.,Takeuchi, T. T.,Burgarella, D.,Clements, D. L.,Jeong, W.-S.,Hanami, H.,Khan, S. A.,Matsuhara, H.,Nakagawa, T.,Oyabu, S.,Pearson, C. P.,Pollo, A.,Serjeant, S.,Taka IOP Publishing 2011 The Astrophysical journal Vol.737 No.1
<P>We report new limits on the absolute brightness and spatial fluctuations of the cosmic infrared background (CIB) via the AKARI satellite. We carried out observations at 65, 90, 140, and 160 mu m as a cosmological survey in AKARI Deep Field South, which is one of the lowest cirrus regions with a contiguous area of the sky. After removing bright galaxies and subtracting zodiacal and Galactic foregrounds from the measured sky brightness, we successfully measured the CIB brightness and its fluctuations across a wide range of angular scales, from arcminutes to degrees. The measured CIB brightness is consistent with previous results reported from COBE data, but significantly higher than the lower limits at 70 and 160 mu m obtained via Spitzer from the stacking analysis of selected 24 mu m sources. The discrepancy with the Spitzer result is possibly due to a new galaxy population at high redshift obscured by hot dust or unknown diffuse emission. From a power spectrum analysis at 90 mu m, two components were identified: the CIB fluctuations with shot noise due to individual galaxies in a small angular scale from the beam size up to 10 arcminutes, and Galactic cirrus emission dominating at the largest angular scales of a few degrees. The overall shape of the power spectrum at 90 mu m is very similar to that at longer wavelengths, as observed by Spitzer and the Balloon-borne Large-Aperture Submillimeter Telescope (BLAST). Our power spectrum, with an intermediate angular scale of 10-30 arcminutes, gives a firm upper limit for galaxy clustering, which was found by Spitzer and BLAST. Moreover, the color of the CIB fluctuations, which is obtained by combining our data with the previous results, is as red as ultra-luminous infrared galaxies at high redshift. These galaxies are not likely to provide the majority of the CIB emission at 90 mu m, but are responsible for the fluctuations. Our results provide new constraints on the evolution and clustering properties of distant infrared galaxies and any diffuse emission from the early universe.</P>
OVERVIEW OF THE NORTH ECLIPTIC POLE DEEP MULTI-WAVELENGTH SURVEY (NEP-DEEP)
Matsuhara, H.,Wada, T.,Takagi, T.,Nakagawa, T.,Murata, K.,Churei, S.,Goto, T.,Oyabu, S.,Takeuchi, T.T.,Ohyama, Y.,Miyaji, T.,Krumpe, M.,Lee, H.M.,Im, M.,Serjeant, S.,Peason, C.P.,White, G.,Malkan, M.A The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
An overview of the North Ecliptic Pole (NEP) deep multi-wavelength survey covering from X-ray to radio wavelengths is presented. The main science objective of this multi-wavelength project is to unveil the star-formation and AGN activities obscured by dust in the violent epoch of the Universe (z=0.5-2), when the star formation and black-hole evolution activities were much stronger than the present. The NEP deep survey with AKARI/IRC consists of two survey projects: shallow wide (8.2 sq. deg, NEP-Wide) and the deep one (0.6 sq. deg, NEP-Deep). The NEP-Deep provides us with a $15{\mu}m$ or $18{\mu}m$ selected sample of several thousands of galaxies, the largest sample ever made at these wavelengths. A continuous filter coverage at mid-IR wavelengths (7, 9, 11, 15, 18, and $24{\mu}m$) is unique and vital to diagnose the contribution from starbursts and AGNs in the galaxies at the violent epoch. The recent updates of the ancillary data are also provided: optical/near-IR magnitudes (Subaru, CFHT), X-ray (Chandra), FUV/NUV (GALEX), radio (WSRT, GMRT), optical spectra (Keck/DEIMOS etc.), Subaru/FMOS, Herschel/SPIRE, and JCMT/SCUBA-2.
INFRARED COMPOSITION OF THE LARGE MAGELLANIC CLOUD
Siudek, M.,Pollo, A.,Takeuchi, T.T.,Ita, Y.,Kato, D.,Onaka, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Understanding the birth and evolution of galaxies, and the history of star formation in them, is one of the most important problems in astronomy. Using the data from the AKARI IRC survey of the Large Magellanic Cloud at 3.2, 7, 11, 15, and $24{\mu}m$, we have constructed a multi-wavelength catalog containing data from the cross-correlation with a number of other databases at different wavelengths. We present the first approach with a Support Vector Machine (SVM)-based method to separate different classes of stars in LMC in the color-color and color-magnitude diagrams.
K. Iino,M. Kitano,M. Takeuchi,M. Matsuoka,M. Anpo 한국물리학회 2006 Current Applied Physics Vol.6 No.6
Advanced ion-beam techniques such as metal ion-implantation, ionized cluster beam (ICB) deposition and RF-magnetron sputtering (RF-MS) deposition were found to enable the development of unique titanium oxide photocatalyst materials which are able to absorb and work not only under UV but also visible or solar light irradiation. Thus prepared visible light-responsive TiO2 act as efficient photocatalysts for the NO decomposition reaction into N2 and O2 as well as the H2 and O2 evolution reaction from water.
Makiya, R.,Totani, T.,Takeuchi, T.T.,Nagashima, M.,Kobayashi, M.A.R. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We will report our recent study on the properties of more than 1,600 galaxies detected by the AKARI All-Sky Survey with physical quantities based on optical and 21-cm observations, to understand the physics determining the infrared spectral energy distribution (Totani et al., 2011). We discover a tight linear correlation for normal star-forming galaxies between the radiation field strength of dust heating (corresponding to dust temperature) and the galactic-scale infrared radiation field, $L_{TIR}/R^2$. This is the tightest correlation of dust temperature ever known, and the dispersion along the mean relation is 13% in dust temperature. This relation can be explained physically by a thin layer of heating sources embedded in a thicker, optically-thick dust screen. We also find that the number of galaxies sharply drops when galaxies become optically thin against dust-heating radiation, indicating that a feedback process to galaxy formation (e.g., by the photoelectric heating) is working when dust-heating radiation is not self-shielded on a galactic scale. We discuss implications from these findings for the $M_{H_I}$ -size relation, the Kennicutt-Schmidt relation, and galaxy formation in the cosmological context.
Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance
Abe, K.,Hayato, Y.,Iida, T.,Ishihara, K.,Kameda, J.,Koshio, Y.,Minamino, A.,Mitsuda, C.,Miura, M.,Moriyama, S.,Nakahata, M.,Obayashi, Y.,Ogawa, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takeuchi, Y.,Ueshi American Physical Society 2006 Physical review letters Vol.97 No.17