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RETRIEVAL OF LOCAL INTERPLANETARY DUST EMISSIVITY BY ASTRO-F
HONG S. S.,KWON S. M.,PYO J.,UENO M.,ISHIGURO M.,USUI F.,WEINBERG J. L. The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.4
This is a proposal to probe local part of the interplanetary dust (IPD) cloud complex and retrieve mean volume emissivity of the local IPDs at mid-infrared wavelengths. This will be done by monitoring, with Infrared Camera (IRC) aboard the ASTRO-F, the annual modulation of the zodiacal emission. In pointing mode of the ASTRO-F mission the spacecraft can make attitude maneuvering over approximately ${\pm}1^{\circ}$ range centered at solar elongation $90^{\circ}$ in the ecliptic plane. The attitude maneuvering combined with high sensitivity of the IRC will provide us with a unique opportunity observationally to take derivatives of the zodiacal emission brightness with respect to the solar elongation. From the resulting differential of the brightness over the ${\pm}1^{\circ}$ range, one can directly determine the mean volume emissivity of the local IPDs with a sufficient accuracy to de-modulate the annual emissivity variations due to the Earth's elliptical motion and the dis-alignment of the maximum IPD density plane with respect to the ecliptic. The non-zero eccentricity ($e_{\oplus}$= 0.0167) of the Earth's orbit combined with the sensitive temperature dependence of the Planck function would bring modulations of amplitude at least $3.34\%$ to the zodiacal emission brightness at mid-infrared wavelengths, with which one may determine the IPD temperature T(r) and mean number density n(r) as functions of heliocentric distance r. This will in turn fix the power-law exponent $\delta$ in the relation $T(r) = T_o(r/r_o)^{-\delta}$ for the dust temperature and v in $n(r) = n_o(r/r_o)^-v$ for the density. We discuss how one may de-couple the notorious degeneracy of cross-section, density, reference temperature $T_o$ and exponent $\delta$.
A PANORAMIC VIEW OF THE ASTEROIDS IN THE INNER SOLAR SYSTEM WITH AKARI
Usui, F.,Kuroda, D.,Muller, T.G.,Hasegawa, S.,Ishiguro, M.,Ootsubo, T.,Ueno, M.,AKARI SOSOS team, AKARI SOSOS team The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We constructed an unbiased asteroid catalog from the mid-infrared part of the All-Sky Survey with the Infrared Camera (IRC) on board AKARI. About 20% of the point source events recorded in the IRC All-Sky Survey observations were not used for the IRC Point Source Catalog in its production process because of a lack of multiple detection by position. Asteroids, which are moving objects on the celestial sphere, are included in these "residual events" We identified asteroids out of the residual events by matching them with the positions of known asteroids. For the identified asteroids, we calculated the size and albedo based on the Standard Thermal Model. Finally we had a new brand of asteroid catalog, which contains 5,120 objects, about twice as many as the IRAS asteroid catalog.
Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v
Kuroda, D.,Ishiguro, M.,Takato, N.,Hasegawa, S.,Abe, M.,Tsuda, Y.,Sugita, S.,Usui, F.,Hattori, T.,Iwata, I.,Imanishi, M.,Terada, H.,Choi, Y.-J.,Watanabe, S.-i.,Yoshikawa, M. Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
RETRIEVAL OF LOCAL INTERPLANETARY DUST EMISSIVITY BY ASTRO-F
홍승수,권석민,표정현,M. UENO,M. ISHIGURO,F. USUI,J. L. WEINBERG 한국천문학회 2004 Journal of The Korean Astronomical Society Vol.37 No.5
This is a proposal to probe local part of the interplanetary dust(IPD) cloud complex and retrievemean volume emissivity of the local IPDs at mid-infrared wavelengths. This will be done by monitoring,with Infrared Camera(IRC) aboard the ASTRO-F, the annual modulation of the zodiacal emission. Inpointing mode of the ASTRO-F mission the spacecraft can make attitude maneuvering over approx-imately 1o range centered at solar elongation 90' in the ecliptic plane. The attitude maneuveringcombined with high sensitivity of the IRC will provide us with a unique opportunity observationallyto take derivatives of the zodiacal emission brightness with respect to the solar elongation. From theresulting dierential of the brightness over the ±1' range, one can directly determine the mean volumeemissivity of the local IPDs with a sucient accuracy to de-modulate the annual emissivity variationsdue to the Earth's elliptical motion and the dis-alignment of the maximum IPD density plane withrespect to the ecliptic. The non-zero eccentricity (e = 0.0167) of the Earth's orbit combined with thesensitive temperature dependence of the Planck function would bring modulations of amplitude at least3.34% to the zodiacal emission brightness at mid-infrared wavelengths, with which one may determinethe IPD temperatureT(r) and mean number density n(r) as functions of heliocentric distancer. Thiswill in turn x the power-law exponent in the relationT(r) = To(r=ro)for the dust temperatureand in n(r) = no(r=ro)for the density. We discuss how one may de-couple the notorious degeneracyof cross-section, density, reference temperatureTo and exponent .
Shogo Maeda,Shinsaku Kawabata,Itsuki Nagase,Ali Baratov,Masaki Ishiguro,Toi Nezu,Takahiro Igarashi,Kishi Sekiyama,Suguru Terai,Keito Shinohara,Melvin John F. Empizo,Nobuhiko Sarukura,Masaaki Kuzuhara 대한전자공학회 2024 Journal of semiconductor technology and science Vol.24 No.1
We have compared the electrical performance of a proposed normally-off GaN-based MIS-HEMTs employing ultrathin AlGaN barrier layer in the channel with those of conventional recessed-gate structure MIS-HEMTs. The proposed device exhibited much less density of interface states extracted from the measured capacitance-voltage characteristics, suggesting improved Al2O3/AlGaN interface. For corresponding three-terminal transistors, while the conventional reference device exhibited poor control of gate-to-source voltage on drain current with about 3 V hysteresis in the transfer curves, the proposed device showed well-behaved subthreshold characteristics with only 0.8 V hysteresis. Furthermore, the proposed device showed a much higher VTH of +5 V compared to +1 V of the conventional reference device.