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- 저자 : Ken Nishida (검색결과 5 건)
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Takata, Hiroyuki,Nishida, Naohisa,Ikehara, Ken,Katsuki, Kota,Khim, Boo-Keun Elsevier 2018 QUATERNARY INTERNATIONAL Vol.482 No.-
<P><B>Abstract</B></P> <P>We investigated fossil benthic and planktonic foraminifera in sediment cores FV10-05 and FV10-06-2, off Fukuoka, southwestern Japan to evaluate the impact of the Tsushima Warm Current on coastal environments around the strait between southeastern Korea and southwestern Japan during the early to middle Holocene. A cluster analysis of benthic foraminifera in these cores established four sample clusters (A, B, C, and D), which are interpreted as indicators of relatively high energy condition due to wave/current processes. Clusters A and C, characterized by attached taxa, became dominant at ∼6.6 ka. Such faunal changes are consistent with the current-influenced sedimentation, confirming that the Tsushima Warm Current reached its present-day distribution at that time. A hiatus at ∼8–7 ka has been reported in cores from deeper water off Fukuoka, whereas our shallow core shows deposition under high energy conditions was continuous even at ∼8–7 ka near the coast off river mouth. Across the strait, the maximum landward extent of benthic foraminifera occurred in the Nakdong River delta (southeastern Korea) in ∼8–7 ka, and an outer bay fauna of benthic foraminifera with seagrass beds occurred transiently in the restricted bay of the San-in district (southwestern Japan) at that time. The evolution of the Tsushima Warm Current during the early to middle Holocene thus appears to play an important role in coastal environments not only in the strait areas between southeastern Korea and southwestern Japan, but also in the San-in district.</P>
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Characteristic evaluations of microwave absorbers using dielectric and magnetic composite materials
Young Joon An,Ken Nishida,Takashi Yamamoto,Shunkichi Ueda,Takeshi Deguchi 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
A microwave absorber for use in an electronic toll collection(ETC) device, having a central frequency of 5.8 GHz, is fabricated using a composite of magnetic (iron, Fe (coated by Fe3O4), made from Carbonyl Iron, Fe(CO)5) and dielectric (titanium oxide, TiO2) material. The reflection loss in free space, using a circularly polarized wave, was −20 dB or more around a central frequency of 5.8 GHz at incident angles of up to 60o, which satisfies the necessary conditions for ETC use in JAPAN. In this study, we explain the characteristic evaluations of microwave absorbers by changing the weight ratio of Fe/TiO2 composite materials (Fe/TiO2 = 100/0-0/100) and incidence characteristics of the transverse electric wave (TE wave), the transverse magnetic wave (TM wave) and the circularly polarized wave (CP wave) in a free-space without a characteristic deterioration. In addition, we show the experimental results by changing the arrangement of microwave absorber that also satisfied a necessary condition for ETC use. A microwave absorber for use in an electronic toll collection(ETC) device, having a central frequency of 5.8 GHz, is fabricated using a composite of magnetic (iron, Fe (coated by Fe3O4), made from Carbonyl Iron, Fe(CO)5) and dielectric (titanium oxide, TiO2) material. The reflection loss in free space, using a circularly polarized wave, was −20 dB or more around a central frequency of 5.8 GHz at incident angles of up to 60o, which satisfies the necessary conditions for ETC use in JAPAN. In this study, we explain the characteristic evaluations of microwave absorbers by changing the weight ratio of Fe/TiO2 composite materials (Fe/TiO2 = 100/0-0/100) and incidence characteristics of the transverse electric wave (TE wave), the transverse magnetic wave (TM wave) and the circularly polarized wave (CP wave) in a free-space without a characteristic deterioration. In addition, we show the experimental results by changing the arrangement of microwave absorber that also satisfied a necessary condition for ETC use.
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Antiviral Activity of Peanut (Arachis hypogaea L.) Skin Extract Against Human Influenza Viruses
Juliann Nzembi Makau,Ken Watanabe,Magdy M.D. Mohammed,Noriyuki Nishida 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.8
The high propensity of influenza viruses to develop resistance to antiviral drugs necessitates the continuing search for new therapeutics. Peanut skins, which are low-value byproducts of the peanut industry, are known to contain high levels of polyphenols. In this study, we investigated the antiviral activity of ethanol extracts of peanut skins against various influenza viruses using cell-based assays. Extracts with a higher polyphenol content exhibited higher antiviral activities, suggesting that the active components are the polyphenols. An extract prepared from roasted peanut skins effectively inhibited the replication of influenza virus A/WSN/33 with a half maximal inhibitory concentration of 1.3 μg/mL. Plaque assay results suggested that the extract inhibits the early replication stages of the influenza virus. It demonstrated activity against both influenza type A and type B viruses. Notably, the extract exhibited a potent activity against a clinical isolate of the 2009 H1N1 pandemic, which had reduced sensitivity to oseltamivir. Moreover, a combination of peanut skin extract with the anti-influenza drugs, oseltamivir and amantadine, synergistically increased their antiviral activity. These data demonstrate the potential application of peanut skin extract in the development of new therapeutic options for influenza management.
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Jin-Woong Kim,Hiromi Shima,Ken Nishida,Takashi Yamamoto,Hiroshi Funakubo 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
Ba(ZrxTi1−x)O3 (BZT) thin films with different Zr contents were deposited on (100)MgO and(100)Pt/(100)MgO substrates by RF-magnetron sputtering using metal targets. The BZT thinfilms epitaxially grew on MgO substrates with only a (001)/(100) orientation and had a singleperovskite phase. In all cases, Ba/Ti ratio was stoichiometric and the BZT films possessed a densemicrostructure. The grain size decreased with increasing Zr content. At room temperature, adielectric constant as a function of the DC bais (tunability) of nearly 30% was achieved at 1 MHz;meanwhile, a relatively low dielectric loss was obtained. Moreover, after a post-annealing process,the tunability was increased significantly. These results indicate that we succeeded in depositinghigh-quality, and potential tunable ferroelectrics.
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