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Träfflista för sökning "WFRF:(Kuramoto T.) srt2:(2015-2019)"

Sökning: WFRF:(Kuramoto T.) > (2015-2019)

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1.
  • Schüpbach, S., et al. (författare)
  • Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene
  • 2018
  • Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 9:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The Northern Hemisphere experienced dramatic changes during the last glacial, featuring vast ice sheets and abrupt climate events, while high northern latitudes during the last interglacial (Eemian) were warmer than today. Here we use high-resolution aerosol records from the Greenland NEEM ice core to reconstruct the environmental alterations in aerosol source regions accompanying these changes. Separating source and transport effects, we find strongly reduced terrestrial biogenic emissions during glacial times reflecting net loss of vegetated area in North America. Rapid climate changes during the glacial have little effect on terrestrial biogenic aerosol emissions. A strong increase in terrestrial dust emissions during the coldest intervals indicates higher aridity and dust storm activity in East Asian deserts. Glacial sea salt aerosol emissions in the North Atlantic region increase only moderately (50%), likely due to sea ice expansion. Lower aerosol concentrations in Eemian ice compared to the Holocene are mainly due to shortened atmospheric residence time, while emissions changed little.
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2.
  • Kuramoto, W., et al. (författare)
  • Wideband Design of a 350GHz-band Corporate-feed Waveguide Slot Array Antenna using Gold-coating Silicon Wafers with Different Thickness
  • 2019
  • Ingår i: 2019 International Symposium on Antennas and Propagation, ISAP 2019 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc..
  • Konferensbidrag (refereegranskat)abstract
    • In this paper, the radiating element of 2x2 slots is designed for a 350 GHz-band corporate-feed waveguide slot array antenna using gold-coating silicon wafers with different thickness (30 μm, 180 μm, and 275 μm) to improve the bandwidth. A 20.0% bandwidth for the reflection less than -15 dB is achieved. The bandwidth for VSWR less than 1.5 in a 16x16-slot array with a feeding circuit is 18.7% by simulation. The aperture efficiency and the antenna efficiency at the center frequency of 362.5 GHz are 94.3% and 85.4%, respectively.
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