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MOA-2011-BLG-322Lb: a 'second generation survey' microlensing planet
Shvartzvald, Y.,Maoz, D.,Kaspi, S.,Sumi, T.,Udalski, A.,Gould, A.,Bennett, D. P.,Han, C.,Abe, F.,Bond, I. A.,Botzler, C. S.,Freeman, M.,Fukui, A.,Fukunaga, D.,Itow, Y.,Koshimoto, N.,Ling, C. H.,Masuda Oxford University Press 2014 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.439 No.1
Pressure and Temperature Control and HPHT Diamond Synthesis Using FB25 Type Belt Apparatus
Fukunaga, O.,Ko, Y.S.,Ohashi, N. The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.1
Flat belt(FB) type high pressure apparatus has been succesfully utilized in various high pressure experimental stations in Korea and Japan to conduct HPHT (high pressure and high temperature) diamond synthesis. Present paper discusses pressure calibration of FB apparatus at high temperature to establish P-T condition of diamond synthesis. We also present some examples of controling P-T condition through careful experimental set-up of the high pressure sample cells. Finally we discuss reproducibility of pressure and temperature condition of the HPHT diamond synthesis.
M. Fukunaga,Y. Noda 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
We measured the ferroelectric D-E hysteresis loops of multiferroic EuMn2O5 by using the double- wave method (DWM), which was recently developed. The DWM can extract the hysteresis loops with respect to the bias electric field, for example, ferroelectric loops and antiferroelectric loops. Improvements and supplementary explanations for the DWM are given in this paper. Ferrielectric hysteresis loops were obtained as combinations of three loops by using the non-biased and biased DWM. The temperature dependences of the ferroelectric and the antiferroelectric parts of the polarization of EuMn2O5 was measured by using the DWM. The former decreases and the latter increases between about 14-21 K. We measured the ferroelectric D-E hysteresis loops of multiferroic EuMn2O5 by using the double- wave method (DWM), which was recently developed. The DWM can extract the hysteresis loops with respect to the bias electric field, for example, ferroelectric loops and antiferroelectric loops. Improvements and supplementary explanations for the DWM are given in this paper. Ferrielectric hysteresis loops were obtained as combinations of three loops by using the non-biased and biased DWM. The temperature dependences of the ferroelectric and the antiferroelectric parts of the polarization of EuMn2O5 was measured by using the DWM. The former decreases and the latter increases between about 14-21 K.
Temperature Dependences of Electric Polarization and Magnetic Ordering of TmMn2O5
Mamoru Fukunaga,H Kimura,K Kohn,Y Noda 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
In order to reveal the relationship between the appearance of ferroelectricity of RMn2O5 and magnetic ordering, we have measured the ferroelectric P-E hysteresis loops and investigated the temperature dependence of the electric polarization of TmMn2O5. Strange P-E loops were ob- served, and a pyroelectric response was observed even on zero .eld cooling. The causes of both strange phenomena are unknown, but the temperature-dependent tendencies of the polarization and of the coercive .eld corresponding to the magnetic phase diagram were observed.
MAGNETIC PROPERTIES OF FERRITE CORES UNDER DC - BIASED FIELD
H. Fukunaga,S. Masumoto,Y. Ohta,H. Kakehashi,H. Ogasawara 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Ferrite cores are often magnetized under DC-biased field because they have been intensively used in electronic circuits such as an inverter circuit and a switching regulator circuit. Thus we investigated the effects of DC-biased field on magnetic properties in the frequency range of DC-100㎑ for two kinds of ferrite cores, TDK PC38 and TDK H₃S, which have different shapes of B-H loop from each other. The magnetic loss per cycle, W/f, in the H₃S core decreased with increasing the strength of DC-biased field, although W/f in the PC38 core increased monotonically with DC-biased field. The observed decreasing tendency differs from the previous result for Si-Fe and ferrite cores, and can be attributed to decrease in eddy current loss as well as that in hysteresis loss.
COMPUTER SIMULATION OF MAGNETIC PROPERTIES OF SPRING MAGNETS
N. Kitajima,H. Inoue,Y. Kanai,H. Fukunaga 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Magnetic properties of model exchange-spring magnets, which are composed of magnetically soft and hard grains, were calculated by means of computer simulation. The dependence of the magnetic properties on the strength of intergrain exchange interaction and the amount of soft grains was studied. The existence of soft grains enhanced the remanence remarkably, and the remanence over 0.8Ms was obtained in the model magnets containing 25% or more soft grains by volume. The calculated coercivity vs. the strength of the exchange interaction curves showed a peak at a critical strength of the exchange interaction, although the remanence increased monotonously with increase in the strength of the exchange interaction. Thus the maximum energy product also reached a peak around the same critical strength. The calculated maximum energy product exceeded 300kJ/㎥ when the magnet is assumed to be composed of Fe₃B and Nd₂Fe₁₄B.
INTERPRETATION OF A SHORT-TERM ANOMALY IN THE GRAVITATIONAL MICROLENSING EVENT MOA-2012-BLG-486
Hwang, K.-H.,Choi, J.-Y.,Bond, I. A.,Sumi, T.,Han, C.,Gaudi, B. S.,Gould, A.,Bozza, V.,Beaulieu, J.-P.,Tsapras, Y.,Abe, F.,Bennett, D. P.,Botzler, C. S.,Chote, P.,Freeman, M.,Fukui, A.,Fukunaga, D.,Ha IOP Publishing 2013 The Astrophysical journal Vol.778 No.1
<P>A planetary microlensing signal is generally characterized by a short-term perturbation to the standard single lensing light curve. A subset of binary-source events can produce perturbations that mimic planetary signals, thereby introducing an ambiguity between the planetary and binary-source interpretations. In this paper, we present the analysis of the microlensing event MOA-2012-BLG-486, for which the light curve exhibits a short-lived perturbation. Routine modeling not considering data taken in different passbands yields a best-fit planetary model that is slightly preferred over the best-fit binary-source model. However, when allowed for a change in the color during the perturbation, we find that the binary-source model yields a significantly better fit and thus the degeneracy is clearly resolved. This event not only signifies the importance of considering various interpretations of short-term anomalies, but also demonstrates the importance of multi-band data for checking the possibility of false-positive planetary signals.</P>