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DISCOVERY OF A WANDERING RADIO JET BASE AFTER A LARGE X-RAY FLARE IN THE BLAZAR MARKARIAN 421
Niinuma, K.,Kino, M.,Doi, A.,Hada, K.,Nagai, H.,Koyama, S. IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.807 No.1
<P>We investigate the location of the radio jet bases ('radio cores') of blazars in radio images and their stationarity by means of dense very long baseline interferometry (VLBI) observations. In order to measure the position of a radio core, we conducted a 12 epoch astrometric observation of the blazar Markarian 421 with the VLBI Exploration of Radio Astrometry at 22 GHz immediately after a large X-ray flare, which occurred in the middle of 2011 September. For the first time, we find that the radio core is not stationary but rather changes its location toward 0.5 mas downstream. This angular scale corresponds to the de-projected length of a scale of 10(5) Schwarzschild radii (R-s) at the distance of Markarian 421. This radio-core wandering may be a new type of manifestation associated with the phenomena of large X-ray flares.</P>
A Molecular Dynamics Study of the Deposition and the Diffusion Behaviors of Al on a Cu Surface
김상필,K.-R. Lee,김영근,정용재,M. Doi,M. Sahashi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
The deposition and the diffusion behaviors of Al atoms on Cu surfaces of various orientations were investigated by using classical molecular dynamics simulations and molecular static calculations. Al atoms with a kinetic energy of 0.1 eV were deposited at room temperature. On the Cu(001) surface, the deposited Al atoms tend to agglomerate only with adjacent atoms. In the case of the Cu(111) surface, surface diffusion of Al atoms is significant even as a time scale between two consecutive depositions (5 ps). Most deposited atoms are, thus, agglomerated near the surface step. In contrast, Al atoms deposited on Cu(011) hardly diffuse on the surfaces but intermix with the Cu atoms, resulting in an atomistically rough interface. These behaviors are consistent with changes in the activation barrier for a possible kinetic process that depends on the orientation of the substrate.
WIDE-FIELD IMAGING WITH MOSAIC CCD CAMERAS
OKAMURA S.,DOI M.,KAWASAKI W.,KOMIYAMA Y.,SHIMASAKU K.,YAGI M.,YASUDA N.,KASHIKAWA N.,SEKIGUCHI M. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
An outline is given of our development of mosaic CCD cameras. Hardware and data reduction software of two operational cameras are described. Scientific objectives of wide-field imaging with the cameras are briefly described.
T. Ogawa,K. Seto,D. Hasegawa,H. T. Yang,H. Kura,M. Doi,M. Takahashi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method has been developed. As a result, fast nucleation process promotes formation of ~4 ㎚ of initial nucleus with a non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled surface precipitation mode (< 100 atoms/(minㆍ㎚²)) can form the growth layer on the surface of initial nucleus with high saturation magnetization (~190 emu/gFe) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO)? should be one of the key issues to achieve much higher Ms of Fe NPs.