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Study of Winding Method to Reduce Stray Loss and Stator Core Vibration of Synchronous Machine
Hiramatsu, Daisuke,Sutrisna, Kadek Fendy,Ishizuka, Hiroaki,Okubo, Masashi,Tsujikawa, Kazuma,Ueda, Takashi,Hachiya, Hideyuki,Mori, Junji,Aso, Toshiyuki,Otaka, Toru Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.3
The fractional slot windings are widely used in rotating machine in order to increase the flexibility of design and improve the voltage waveform. However, the MMF wave of fractional-slot windings are found to contain unique harmonic component, which are designated as even order space flux harmonics, fractional number flux harmonics, or both. They may cause stray loss and stator core vibration. This paper proposes new winding methods "novel interspersed windings" and "expanded group windings" to reduce these harmonics. The advantages of two proposed windings are verified by using numerical analysis and measurement test of winding model.
Domain Wall Pinning by a Stray Field from NiFe on a Co/Ni Nanowire
R. Hiramatsu,T. Koyama,H. Hata,T. Ono,D. Chiba,S. Fukami,N. Ishiwata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the influence of a stray field on a magnetic domain wall (DW). Thedepinning fields of a DW in a perpendicularly magnetized Co/Ni nanowire with partly-stackedNi81Fe19/SiO2 islands on it was measured. The depinning field for the wire with Ni81Fe19/SiO2was found to be higher than that for the wire without the stack, indicating that the stray field fromthe Ni81Fe19/SiO2 stack clearly served as an artificial pinning site for the DW. The magnetic forcemicroscopy observation evidenced that the DW was pinned near the Ni81Fe19 stack.
Genomic Basis for Methicillin Resistance in Staphylococcus aureus
Keiichi Hiramatsu,Teruyo Ito,Sae Tsubakishita,Takashi Sasaki,Fumihiko Takeuchi,Yuh Morimoto,Yuki Katayama,Miki Matsuo,Kyoko Kuwahara-Arai,Tomomi Hishinuma,Tadashi Baba 대한감염학회 2013 Infection and Chemotherapy Vol.45 No.2
Since the discovery of the first strain in 1961 in England, MRSA, the most notorious multidrug-resistant hospital pathogen, has spread all over the world. MRSA repeatedly turned down the challenges by number of chemotherapeutics, the fruits of modern organic chemistry. Now, we are in short of effective therapeutic agents against MRSA prevailing among immuno-compromised patients in the hospital. On top of this, we recently became aware of the rise of diverse clones of MRSA, some of which have increased pathogenic potential compared to the classical hospital-associated MRSA, and the others from veterinary sources. They increased rapidly in the community, and started menacing otherwise healthy individuals by causing unexpected acute infection. This review is intended to provide a whole picture of MRSA based on its genetic makeup as a versatile pathogen and our tenacious colonizer.