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325 results on '"Hirooka T"'

5. Quasi-linear Optical Pulses in Dispersion Managed Fibers: Propagation and Interaction

Author

Ablowitz, M. J., Hirooka, T., Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v. Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Porsezian, K., editor, and Kuriakose, V. C., editor

Published
2003
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18. Interaction of multiple iron balls in magnetic fields

Author

Murakami, M., Nishimura, Y., Hirooka, T., Sasaki, S., and Yagi, I.

Subjects
Iron -- Properties, Magnetic fields -- Measurement, Physics
Abstract

The field distribution around multiple iron balls exposed to nearly parallel magnetic fields generated from a large permanent magnet are measured. The iron balls are magnetized in the same direction, which causes repulsive interaction, and this results in peculiar distributions of the iron balls.

Published
2005

25. High Time-Resolution 640-Gb/s Clock Recovery Using Time-Domain Optical Fourier Transformation and Narrowband Optical Filter

Author

Guan, P., Mulvad, Hans Christian Hansen, Kasai, K., Hirooka, T., Nakazawa, M., Guan, P., Mulvad, Hans Christian Hansen, Kasai, K., Hirooka, T., and Nakazawa, M.

Abstract

We present a novel scheme for subharmonic clock recovery from an optical time-division-multiplexing signal using time-domain optical Fourier transformation and a narrowband optical filter. High-resolution 640-Gb/s clock recovery is successfully demonstrated with no pattern dependence. The clock recovery is also applied to a 640-Gb/s differential phase-shift-keying transmission, and error-free performance is achieved over 300 km.

Published
2010

31. Normal mode Rossby waves observed in the upper stratosphere

Author

Hirooka, T and Hirota, I

Subjects
Geophysics
Abstract

In recent years, observational evidence has been obtained for westward traveling planetary waves in the middle atmosphere with the aid of global data from satellites. There is no doubt that the fair portion of the observed traveling waves can be understood as the manifestation of the normal mode Rossby waves which are theoretically derived from the tidal theory. Some observational aspects of the structure and behavior of the normal model Rossby waves in the upper stratosphere are reported. The data used are the global stratospheric geopotential thickness and height analyses which are derived mainly from the Stratospheric Sounding Units (SSUs) on board TIROS-N and NOAA satellites. A clear example of the influence of the normal mode Rossby wave on the mean flow is reported. The mechanism considered is interference between the normal mode Rossby wave and the quasi-stationary wave.

Published
1985

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