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Articles by M. Matsubayashi
Total Records ( 5 ) for M. Matsubayashi
  J. Saeki , H. Nakanishi , K. Masubuchi , M. Matsubayashi , M. Furuya , H. Tani and K. Sasai
  Background and objective: Leptospirosis can cause a wide range of symptoms with an acute febrile disease in humans and animals. Recently, in Japan, there has been an increase in the number of feral raccoons (Procyon lotor) and they have been implicated as a source of zoonotic pathogens, including Leptospira spp. However, there are only a few reports on the prevalence of Leptospira spp. in wild animals, although 7 serovars of Leptospira spp. have been reported. The objective of this study was to examine seroprevalence of Leptospira spp. in raccoons. Methodology: The seroprevalence of Leptospira spp. antibodies was determined in 40 raccoons (Procyon lotor) in Osaka, Japan, from April-June, 2011. Leptospira spp., antibodies were detected in 23 raccoons (57.5%) using the Microscopic Agglutination Test (MAT). Antibodies against Leptospira interrogans serovar hebdomadis were most frequently detected (30.0%), followed by those against Leptospira interrogans serovar autumnalis (17.5%), Leptospira kirschneri serovar grippothyphosa (15.0%), Leptospira interrogans serovar copenhageni (7.5%) and Leptospira interrogans serovar australis (2.5%). Results: Leptospira interrogans serovars hebdomadis and australis were detected in all areas examined in Osaka. Leptospira kirschneri serovar grippothyphosa and Leptospira interrogans serovar copenhageni were detected only in animals from Southern Osaka, suggesting a regional distribution. Raccoons are environmentally adaptable omnivores and are expanding their range into urban areas and forests in Japan. Conclusion: Therefore, it is important to elucidate the potential risks that they may pose to public health by conducting surveys throughout Japan for zoonotic pathogens, such as Leptospira spp. that they may carry.
  H. Hayashida , M. Segawa , R. Yasuda , H. Iikura , T. Sakai and M. Matsubayashi
 

A multi-pinhole collimator system, which is effective for enlarging imaging area with high spatial resolution, has been demonstrated on Cold Neutron Radiograph Facility at JRR-3M in JAEA. The multi-pinhole collimator system consists of a multi-pinhole aperture and an overlap-cutter. On neutron beam from the multi-pinhole aperture, neutrons from each pinhole overlap at the sample position due to beam divergence. In the overlap area, sample images from each pinhole are obtained at a detector and these images look like split images. The overlap-cutter works to cut neutrons contribute to overlap at sample position and enable us to get an image without split. Imaging area was enlarged and sharp image without split was successfully obtained by using the multi-pinhole collimator system.

  H. Iwase , S. Koizumi , H. Iikura , M. Matsubayashi , D. Yamaguchi , Y. Maekawa and T. Hashimoto
 

In order to visualize water generated in an operating polymer electrolyte fuel cell (PEFC), a neutron radiography (NR) apparatus, composed of a scintillator, optical mirrors and a CCD camera, was installed at a sample position of the focusing and polarized neutron small-angle scattering (SANS) spectrometer (SANS-J-II) at research reactor JRR-3 at Japan Atomic Energy Agency, Tokai, Japan. By combining SANS and NR, we aim to cover a wide length scale from nanometer to millimeter. The new method succeeded in detecting a spatial distribution of the water generated in individual cell elements; NR detected the water in a gas diffusion layer and a flow field, whereas SANS quantitatively determines the water content in a membrane electrode assembly (MEA).

  Y. Saito , X. Shen , K. Mishima and M. Matsubayashi
 

Dynamic behavior of a two-phase bubble, i.e. a steam bubble containing a droplet evaporating in the bubble, in the molten alloy was clearly visualized using high-frame-rate neutron radiography. In relation to some direct contact heat exchanger design with molten lead–bismuth (Pb–Bi), experiments have been done at JRR-3M of JAEA (Japan Atomic Energy Agency) with water droplets evaporating in a stable thermally stratified Newton's alloy pool. The instantaneous shape and size of the bubble has been iteratively estimated from the void fraction distributions and total void volume by assuming a symmetrical bubble shape.

  A. Cho , M. Matsubayashi and S. Hasegawa
 

Neutron radiography experiments were performed to visualize water permeation into granite. Four types of cubic granite samples, 40 mm in length, were placed on a wet sponge, and neutron radiographs were taken every 10 min. The developments of water permeation front could be observed by subtracting the brightness of the two consecutive images.

 
 
 
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