A new melt electrospinning system equipped with a line-like laser beam melting device developed for the mass production of nanofibers is introduced; this system enables fibers to be produced from locally melted polymer sheets in the presence of an electric field. Using this system, fibers were produced from poly(ethylene-co-vinyl alcohol)(EVOH) and Nylon 6/12 sheets. The fiber formation mechanism was investigated with a video camera and a thermographic camera. It was found that (1) many Taylor cones are formed on the molten end surface of the sheet at almost regular intervals; (2) a single fiber is produced from the apex of each Taylor cone; and (3) the temperature in the Taylor cone changes markedly during the fiber production. Furthermore, it is found that fibers with an average diameter smaller than 1 lm can be produced from EVOH and Nylon 6/12 sheets by the optimization of manufacturing parameters such as laser output power, voltage, sheet thickness and the feed rate of the sheet.

Abstract:We experimented with vein grafting surgery on Göttingen minipigs. Using the internal jugular vein for the tissue graft, we performed side-to-side anastomosis to the carotid artery, to which it runs parallel. One key point in this surgery was to prevent vasospasm of the carotid artery so as to keep the lumen sufficiently patent during anastomosis. The histopathological findings in the grafts which remained patent resembled those of vein grafts in humans. We therefore considered that this technique in minipigs can be applied for the study of coronary artery bypass surgery in humans.

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要 約 2011年東北地方太平洋沖地震後に福島県浜通り付近で発生した正断層の地震群の強震記録) ( log 10 ln log ) ( log ) ( log 10 10 10 10 Q=70f 0.9 でモデル化された。これは、東日本の逆断層の地殻内地震の震源近傍における平均的Q値 6) であるQ=35fの約2倍であり、減衰しにくい特徴があることがわかった。 ・ M J 7.0の正断層の地震(M w 6.6)では、比較対象とした逆断層のM J 6.4の2003年宮城県北部の地震(M w 6.1) Res. Lett., Vol.68, 1997, pp.199-222. 16) Modelling,Vol.12, No.8, 1989, pp. 967-973. 25) Satoh, T. : Inversion of Qs value of deep sediments from surface-to-borehole spectral ratios considering obliquely incident SH and SV-waves, Bull. Seism. Soc. Am., Vol.96, 2006, pp.943-956. 26) Boore, D. M. : Stochastic simulation of high-frequency ground motions based on seismological models of the radiated spectra, Bull. Seism. Soc. Am., Vol.73, 1983Vol.73, , pp.1865Vol.73, -1894) Boore, D. M. and J. Boatwright : Average body-wave radiation coefficient, Bull. Seism. Soc. Am., Vol.74, 1984Vol.74, , pp.1615Vol.74, -1621 2) Non-Member, Director, Japan Nuclear Energy Safety Organization, Mr. Eng. ABSTRACTWe estimate the short-period spectral level A of the normal-faulting earthquakes in Hamadori, Fukushima prefecture in 2011 using the spectral inversion method. The A of M J 7.0(M w 6.6) earthquake is consistent with the average empirical relation between the seismic moment and A for crustal earthquakes. The PGA and PGV of this earthquake corrected by empirical site-amplification factor at each strong motion station agree with the average empirical attenuation relation for crustal earthquakes in Japan. The high area of the fault-normal to fault-parallel ratios of response spectra at 5 second of the normal-faulting earthquakes is longer than that of reverse-faulting earthquakes due to the domination of Rayleigh waves.