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Hiroaki Onuma 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.S1
This paper presents the methodology for the estimation of the emission efficiency of Eu2+-doped phosphors based on their structural information. It was figured out from the electronic structures of CaAlSiN3:Eu2+ and SrSiN2:Eu2+ that the lowest unoccupied molecular orbital (LUMO), which is mainly consisted of Eu 5d orbital, is a key factor to show high efficiency of Eu2+ emission. Large contribution of Eu 5d orbital to LUMO is found when there is a strong atomic orbital interaction between alkaline earth atoms and Eu2+ atoms. According to the fact, we defined alkaline earth network (ANet) to represent the magnitude of the interaction of alkaline earth atoms with Eu2+ atoms in the host crystal. We calculated ANet for 10 Eu2+ doped phosphors and correlated them with the experimental values of internal quantum efficiency. ANet has an inversely relationship with internal quantum efficiency. ANet is a good index for qualitatively searching a high efficient Eu2+-doped phosphor because it is calculated only from the structural information of targeted phosphors.
稻森悠平,小沼和博,水落元之,西村修 제주대학교 환경연구소 1996 환경연구논문집 : 제주대 Vol.4 No.-
Treatment of domestic and industrial wastewater and purification of polluted groundwater and lake water are very important for conservation of sound water environment. Biological treatment processes are widely used for wastewater treatment and natural water body purification, because most of the pollutants contained in wastewaters are degraded or assimilated by microorganisms. Nowadays, the technologies of mass cultivation of effective microorganisms and their introduction to waste water treatment system have been developed. The present report concerns the current situation and developing tendency of these biotechnologies. The importance of the application of effective microorganisms is also described.
Reaction Zone Thickness of Turbulent Premixed Flame
Yamamoto, Kazuhiro,Nishizawa, Yasuki,Onuma, Yoshiaki The Korean Society of Combustion 2001 한국연소학회지 Vol.6 No.2
Usually, we use the flame thickness and turbulence scale to classify the flame structure on a phase diagram of turbulent combustion. The flame structure in turbulence is still in debate, and many studies have been done. Since the flame motion is rapid and its reaction zone thickness is very thin, it is difficult to estimate the flame thickness. Here, we propose a new approach to determine the reaction zone thickness based on ion current signals obtained by an electrostatic probe, which has enough time and space resolution to detect flame fluctuation. Since the signal depends on the flow condition and flame curvature, it may be difficult to analyze directly these signals and examine the flame characteristics. However, ion concentration is high only in the region where hydrocarbon-oxygen reactions occur, and we can specify the reaction zone. Based on the reaction zone existing, we estimate the reaction zone thickness. We obtain the thickness of flames both in the cyclone-jet combustor and on a Bunsen burner, compared with theoretically predicted value, the Zeldovich thickness. Results show that the experimentally obtained thickness is almost the same as the Zeldovich thickness. It is concluded that this approach can be used to obtain the local flame structure for modeling turbulent combustion.
일본 새매 (Accipiter virugatus gularis)로부터 분리된 Paramyxovirus에 대한 단 Clone성 항체
Hoshi,Mikami, S.T.,Onuma, M.,Izawa, H. 한국가금학회 1983 韓國家禽學會誌 Vol.10 No.1
Monoclonal antibodies against Taka virus, a variant of Newcastle disease virus (NDV), were produced to compare the antigenicites of several avian paramyxoviruses including NDV. It was also used to study the activesite(s) of haemagglutin (HA) and neuraminidase activities of NDV. Five independent hybrid cell lines, which produced monoclonal antibodies against haemagglutinin-neuraminidase (HN) molecule of Taka virus, were established. From the results of the cross haemagglutination-inhibition(HI) test the monoclonal antibodies, the HN molecule of Taka virus seemed to have at least three different antigenic determinats; one was specific for all NDV strain tested, the second was only for Taka virus and the third was for Take virus, Banger and Yucaipa Furthermore the differences in the ratio of HI to neuraminidase-inhibition titers suggested that the active sites involved in HA and neuraminidase activities might be different from each other. However, since each of five monoclonal anitbodies was not especially specific for either HA or neuraminidase, the possibility that a single active site on the HN molecule may be responsible for both activities has not been excluded.