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Development of 1700V Hybrid Module with Si-IGBT and SiC-SBD for High Efficiency
T. Takaku,H. Wang,N. Matsuda,S. Igarashi,T. Nishimura,S. Miyashita,O. Ikawa 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and SiC-SBD. The static and dynamic characteristics were evaluated and the turn-on loss is 38% lower and the reverse recovery loss is 83% lower than the conventional all-Si IGBT module because of the reverse recovery current of SiC-SBD is very small to be an unipolar device. The radiation noise on hybrid module becomes higher with increasing collector current, but the peak value of the noise from hybrid module is almost same as the all-Si module if the collector current is less than 300A. In AC690V PWM inverter, the total power dissipation of hybrid module is 8% lower at 1 kHz and 29% lower at 10 kHz compare to the all Si module. Therefore the 1700V hybrid module is useful as a power module for an AC690V high efficiency inverter system such as wind power generation system and high voltage solar power generation system. This paper reports about the static and dynamic characteristics and the radiation noise measurement results on the 400A/1700V hybrid module.
Measurement of Unbound Excited States of ^(24)O
추경호,사토,T. Nakamura,N. Aoi,방형찬,S. CHOI,S. Deguchi,F. Delaunay,J. Gibelin,T. Honda,M. Ishihara,Y. Kawada,Y. Kondo,T. Kobayashi,N. Kobayashi,F. M. Marques,M. Matsushita,Y. Miyashita,T. Motobayashi,Y. Nak 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The unbound excited states of the most neutron-rich oxygen isotope, ^(24)O (Z = 8, N = 16), have been investigated using the ^(24)O(p,p') ^(24)O^* → ^(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of ^(24)O was produced in a Be production target by the projectile-like fragmentation of a 95 MeV/u ^(40)Ar primary beam. The first excited 2^* state was observed in the invariant mass spectrum. This experiment will give us a deeper understanding of the new magic number at N=16 in the neutron-rich oxygen isotopes.
Shiga, S.,Hirooka, Y.,Miyashita, Y.,Yagi, S.,Machacon, H.T.C.,Karasawa, T.,Nakamura, H. The Korean Society of Automotive Engineers 2001 International journal of automotive technology Vol.2 No.1
This paper presents further investigation into the effect of over-expansion cycle in a spark-ignition engine. On the basis of the results obtained in previous studies, several combinations of late-closing (LC) of intake valve and expansion ratio were tested using a single-cylinder production engine. A large volume of intake capacity was inserted into the intake manifold to simulate multi-cylinder engines. With the large capacity volume, LC can decrease the pumping loss and then increase the mechanical efficiency. Increasing the expansion ratio from 11 to 23.9 with LC application can produce about 13% improvement of thermal efficiency which was suggested to be caused by the increased cycle efficiency. The decrease of compression ratio from 11 to 5.5 gives little effect on the thermal efficiency if the expansion ratio could be kept constant. Thus, the expansion ratio is revealed to be a determining factor for cycle efficiency, while compression ratio is no more important, which suggests the usefulness of controlling the intake charge with intake valve closure timing. These were successfully explained by simple thermodynamic calculation and thus the mechanism could be verified by the estimation.
Literature Review on Recent Magnetocardiography and Impedance-Magnetocardiography Technologies
Kandori, A.,Miyashita, T.,Ogata, K.,Seki, Y.,Suzuki, D.,Tsukamoto, A.,Saito, K.,Yokosawa, K.,Tsukada, K.,Yamada, Satsuki,Watanabe, Shigeyuki,Horigome, Hitoshi,Yamaguchi, Iwao The Korean Superconductivity Society 2006 Progress in superconductivity Vol.8 No.1
We have developed magnetocardiography(MCG) and impedance magnetocardiography(I-MCG) for detecting heart disease by using dc-SQUID technology. The MCG system, using low-Tc SQUID, is being applied commercially for diagnosing heart disease. Using the low-Tc MCG system, many clinical studies on detection of abnormality have been performed. Furthermore, we have developed a portable MCG system using high-Tc SQUID. For detecting changes in kinetic impedance in the heart, an I-MCG system has been demonstrated. The I-MCG system could detect the mechanical movement of the heart. In this report, we review current clinical applications of magnetocardiography and impedance magnetocardiography.
Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras
Fukizawa, M.,Sakanoi, T.,Miyoshi, Y.,Hosokawa, K.,Shiokawa, K.,Katoh, Y.,Kazama, Y.,Kumamoto, A.,Tsuchiya, F.,Miyashita, Y.,Tanaka, Y. ‐,M.,Kasahara, Y.,Ozaki, M.,Matsuoka, A.,Matsuda, S.,Hikish American Geophysical Union 2018 Geophysical research letters Vol.45 No.23
S. SHIGA,Y. HIROOKA,Y. MIYASHITA,S. YAGI,H. T. C. MACHACON,T. KARASAWA,H. NAKAMURA 한국자동차공학회 2001 International journal of automotive technology Vol.2 No.1
This paper presents further investigation into the effect of over-expansion cycle in a spark-ignition engine. On the basis of the results obtained in previous studies. several combinations of late-closing (LC) of intake valve and expansion ratio were tested using a single-cylinder production engine. A large volume of intake capacity was inserted into the intake manifold to simulate multi-cylinder engines. With the large capacity volume. LC can decrease the pumping loss and then increase the mechanical efficiency. Increasing the expansion ratio from 11 to 23.9 with LC application can produce about 13% improvement of thermal efficiency which was suggested to be caused by the increased cycle efficiency. The decrease of compression ratio from 11 to 5.5 gives little effect on the thermal efficiency if the expansion ratio could be kept constant. Thus. the expansion ratio is revealed to be a determining factor for cycle efficiency. while compression ratio is no more important. which suggests the usefulness of controlling the intake charge with intake valve closure timing. These were successfully explained by simple thermodynamic calculation and thus the mechanism could be verified by the estimation.<br/>
Literature Review on Recent Magnetocardiography and Impedance-MagnetocardiographyTechnologies
Y. Seki,A. Tsukamoto,K. Tsukada,Hitoshi Horigome,Miki Yokokawa,Yoshihide Chiba,Kimio Tanaka,A. Kandori,T. Miyashita,K. Ogata,D. Suzuki,K. Saito,K. Yokosawa,Satsuki Yamada,Shigeyuki Watanabe,Iwao Yamag 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1