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OVERVIEW OF NORTH ECLIPTIC POLE DEEP MULTI-WAVELENGTH SURVEY (NEP-DEEP)
H. Matsuhara,T. Wada,N. Oi,T. Takagi,T. Nakagawa,K. Murata,T. Goto,S. Oyabu,T.T. Takeuchi,K. Ma lek,A. Solarz,Y. Ohyama,T. Miyaji,M. Krumpe,H. M. Lee,임명신,S. Serjeant,C. P. Pearson,G. J. White,M. A. Ma 한국천문학회 2017 天文學論叢 Vol.32 No.1
The recent updates of the North Ecliptic Pole deep (0.5~deg$^2$, NEP-Deep)multi-wavelength survey covering from X-ray to radio-wave is presented. The NEP-Deep provides us with several thousands of 15~$\mu$m or 18~$\mu$mselected galaxies, which is the largest sample ever made at thesewavelengths. A continuous filter coverage in the mid-infrared wavelength(7, 9, 11, 15, 18, and 24~$\mu$m) is unique and vital to diagnose thecontributions from starbursts and AGNs in the galaxies out to $z$=2. The new goal of the project is to resolve the nature of the cosmic star formationhistory at the violent epoch (e.g. $z$=1--2), and to find a clue to understandits decline from $z$=1 to presentuniverse by utilizing the unique power of the multiwavelength survey. The progressin this context is briefly mentioned.
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.
CHANDRA OBSERVATIONS OF THE AKARI NEP DEEP FIELD
T. Miyaji,M. Krumpe,H. Brunner,T. Ishigaki,H. Hanami,A. Markowitz,T. Takagi,T. Goto,M. A. Malkan,H. Matsuhara,C. Pearson,Y. Ueda,T. Wada 한국천문학회 2017 天文學論叢 Vol.32 No.1
The AKARI NEP Deep Field Survey is an international multiwavelength survey over 0.4 deg$^2$ of the sky. This is the deepest survey made by the InfraRed Camera (IRC) of the infrared astronomical satellite AKARI with 9 filters continuously covering the 2-25 μm range, including three filters in the Spitzer gap between the IRAC and MIPS coverages. This enabled us to make sensitive MIR detection of AGN candidates at z ~ 1, based on hot dust emission in the AGN torus. It is also efficient in detecting highly obscured Compton-thick AGN population. In this article, we report the first results of X-ray observations on this field. The field was covered by 15 overlapping Chandra ACIS-I observations with a total exposure of ~ 300 ks, detecting $\approx 450$ X-ray sources. We utilize rest-frame stacking analysis of the MIR AGN candidates that are not detected individually. Our preliminary analysis shows a marginal detection of the rest-frame stacked Fe K$\alpha$ line from our strong Compton-thick candidates.
T.P. Rao,N. Sakaguchi,L.R. Juneja,E. Wada,T. Yokozawa 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.3
The antioxidant properties of amla extracts and their effects on the oxidative stress in streptozotocin-induceddiabetes were examined in rats. Amla in the form of either the commercial enzymatic extract SunAmla (Taiyo Kagaku Co.Ltd., Yokkaichi, Japan) (20 or 40 mg/kg of body weight/day) or a polyphenol-rich fraction of ethyl acetate extract (10 or 20mg/kg of body weight/day) was given orally for 20 days to the streptozotocin-induced diabetic rats. Amla extracts showedstrong free radical scavenging activity. Amla also showed strong inhibition of the production of advanced glycosylated endproducts. The oral administration of amla extracts to the diabetic rats slightly improved body weight gain and also signifi-cantly alleviated various oxidative stress indices of the serum of the diabetic rats. The elevated serum levels of 5-hydrox-ymethylfurfural, which is a glycosylated protein that is an indicator of oxidative stress, were significantly reduced dose-de-pendently in the diabetic rats fed amla. Similarly, the serum level of creatinine, yet another oxidative stress parameter, wasalso reduced. Furthermore, thiobarbituric acid-reactive substances levels were significantly reduced with amla, indicating areduction in lipid peroxidation. In addition, the decreased albumin levels in the diabetic rats were significantly improved withamla. Amla also significantly improved the serum adiponectin levels. These results form the scientific basis supporting theefficacy of amla for relieving the oxidative stress and improving glucose metabolism in diabetes.
Satoshi Wada,H. Kakemoto,K Yokoh,T Tsurumi,T Muraishi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
The phase transition behaviors of [111]-oriented barium titanate (BaTiO3) crystals were investigated as functions of temperature, uniaxial stress, and electric field. For the phase transition caused by temperature, with decreasing temperature above Tc, the paraelectric phase changed to an intermediate phase with a superparaelectric state and finally changed to a ferroelectric phase with randomly oriented spontaneous polarizations. Moreover, the phase transition caused by the uniaxial stress field above Tc was found to be almost similar to the one caused by temperature. On the other hand, for the phase transition caused by an electric field above Tc, with increasing electric field, the paraelectric phase changed to an intermediate phase and finally to a ferroelectric phase with an oriented polar direction. These results suggest that above Tc, a combination of uniaxial stress with an electric field may be effective as a poling treatment for BaTiO3 crystals. Thus, in this study, a new poling method for the BaTiO3 crystals by using control of the temperature, the uniaxial stress, and the electric field is proposed.t
Size Dependence of Dielectric Properties for nm-sized Barium Titanate Crystallites and Its Origin
S. Wada,H. Yasuno,H. Kakemoto,M. Yashima,S.-M. Nam,T. Tsurumi,T. Hoshina 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Barium titanate (BaTiO3) crystallites with various particle sizes from 17 to 1,000 nm were prepared by the modiffed 2-step thermal decomposition method. Investigation of impurities in these particles by using both TG-DTA and FT-IR measurements revealed that no impurity was detected in the BaTiO3 lattice, while hydroxyl and carbonate groups were detected only on the surface. Moreover, their relative densities were always above 99 %.The dielectric constants of these powders were measured by using slurries by a modied powder dielectric-measurement method. As a result, the dielectric constant of BaTiO3 particles with a size of around 140 nm exhibited a maximum of around 5,000. By using a synchrotron-radiation X-ray powder experiment, the crystal structure of the BaTiO3 particles with sizes below 100 nm was investigated. As a result, in the BaTiO3 particles with sizes over 40 nm, it was conrmed that their crystal structure was assigned to 4 mm. In the particle size with a maximum dielectric constant of 5,000, its c=a ratio was smaller than 1.011. Finally, to explain the origin of the high dielectric constant, a model related to \superparaelectric behavior" was proposed.