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1,078 results on '"Takada J"'

2. Photo-Luminescence and Possible Forsterite nanoparticles Model of Extended Red Emission

Author

Koike, K., Chihara, H., Koike, C., Nakagawa, M., Okada, M., Matsumura, M., and Takada, J.

Subjects
Astrophysics
Abstract

Possible forsterite nanoparticle model of the Extended Red Emission(ERE) is proposed on the basis of photo-luminescence of forsterite after gamma-ray and neutron irradiation. Forsterite exhibits interesting thermoluminescence spectrum similar to ERE of Red Rectangle after irradiation in low temperature. It is shown that the forsterite after thermoluminescence is over exhibits photo-luminescence(PL) when Ultraviolet ray is irradiated. The structure of PL spectrum is almost similar to that of thermoluminescence. In order to explain small variations of the peak position of wavelength of ERE spectrum, possible nanoparticle model of forsterite is investigated. Our model is consistent to the ISO observation data in near and middle infrared region, which suggest the existence of forsterite., Comment: 5 pages

Published
2004

3. Annual Changes in Some Physiological Properties of Cryptomeria Japonica Leaves from Kanto, Japan

Author

Takamatsu, T., Sase, H., Takada, J., Matsushita, R., Satake, Kenichi, editor, Shindo, Junko, editor, Takamatsu, Takejiro, editor, Nakano, Takanori, editor, Aoki, Shigeru, editor, Fukuyama, Tsutomu, editor, Hatakeyama, Shiro, editor, Ikuta, Kazukamasa, editor, Kawashima, Munetsugu, editor, Kohno, Yoshihisa, editor, Kojima, Satoru, editor, Murano, Kentaro, editor, Okita, Toshiichi, editor, Taoda, Hiroshi, editor, Tsunoda, Kinichi, editor, and Tsurumi, Makoto, editor

Published
2001
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43. Multi-Band Propagation and Radio Channel Characterization in Street Canyon Scenarios for 5G and beyond

Author

Dupleich, D., Müller, R., Landmann, M., Shinwasusin, E.-A., Saito, K., Takada, J.-I., Luo, J., Thomä, R., Galdo, G. del, and Publica

Abstract

Radio access at mm-waves has been subject of intensive research in the latest years. However, within the initial deployment of 5G, mm-waves are still relegated and there is a generalized idea that the mm-wave channel for radio access, in comparison to the sub-6 GHz channel, is not only sparse but also troublesome for outdoor applications. In the present paper we introduce simultaneous multi-band measurements comparing the sub-6 GHz with the mm-waves channel at 30 GHz and 60 GHz in street canyon scenarios using the same measurement equipment in Germany and Japan. An analysis on the propagation and radio channel characteristics shows that the mm-waves channel offers similar opportunities as the sub-6 GHz. Consequently, the challenge relies on the design of an adequate radio interface matching the channel characteristics. In that regard, aspects as the location of clusters and spatial consistency gain importance within geometry-based stochastic channel models (GBSCMs). The analysis of the large-scale parameters (LSPs) has shown a large influence of the geometry of the scenario on the channel, encouraging the introduction of deterministic modelling components within GBSCMs targeting these scenarios.

Published
2019

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