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Microstructural development of macroporous silicon carbide ceramics during annealing
엄정혜,Masaki Narisawa,김영욱 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.2
Macroporous silicon carbide ceramics with porosities ranging from 67% to 84% were fabricated by a carbothermal reduction process from a carbon-filled polysiloxane and subsequent annealing. Microstructural development during annealing was investigated using scanning electron microscopy (SEM). The grain size increased with an increase in the annealing time and the morphology changed from equiaxed to cube or hexagonal platelets depending on the annealing temperature. By controlling the annealing time and annealing temperature, it was possible to adjust the size and morphology of SiC grains in macroporous SiC ceramics.
High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
Stabler, Christina,Roth, Felix,Narisawa, Masaki,Schliephake, Daniel,Heilmaier, Martin,Lauterbach, Stefan,Kleebe, Hans-Joachim,Riedel, Ralf,Ionescu, Emanuel Elsevier 2016 Journal of the European Ceramic Society Vol.36 No.15
<P><B>Abstract</B></P> <P>In this study we present the high-temperature creep behavior of a dense SiOC glass ceramic free of segregated carbon. Solid-state NMR spectroscopy, XRD and TEM investigations indicate that the sample consists of β-SiC nanoparticles homogeneously dispersed in an amorphous silica matrix. Compression creep experiments were performed at 1100–1300°C and stresses of 50–100MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696kJ/mol) is close to that determined in pure silica glass. However, a stress exponent of 1.7 was calculated, suggesting that other mechanisms might contribute to the creep in addition to the Newtonian viscous flow. The strong difference in the creep rates and creep mechanism of the SiOC glass ceramic and amorphous silica is discussed in terms of possible contributions of the interface between the silica matrix and the β-SiC nanoparticles.</P>
Rida O. Khastini,Hiroyuki Ohta,Kazuhiko Narisawa 한국미생물학회 2012 The journal of microbiology Vol.50 No.4
The soil-inhabiting fungal pathogen Fusarium oxysporum has been an increasing threat to Chinese cabbage (Brassica campestris L.). A dark septate endophytic fungus, Veronaeopsis simplex Y34, isolated from Yaku Island, Japan, was evaluated in vitro for the ability to suppress Fusarium disease. Seedlings grown in the presence of the endophyte showed a 71% reduction in Fusarium wilt disease and still had good growth. The disease control was achieved through a synergetic effect involving a mechanical resistance created by a dense network of V. simplex Y34 hyphae, which colonized the host root, and siderophore production acting indirectly to induce a resistance mechanism in the plant. Changes in the relative abundance of the fungal communities in the soil as determined by fluorescently labelled T-RFs (terminal restriction fragments), appeared 3 weeks after application of the fungus. Results showed the dominance of V. simplex Y34, which became established in the rhizosphere and out-competed F. oxysporum.
IS THE EFFECT OF LUXURY ADVERTISING ON CONSUMER EVALUATIONS OF FASHION BRANDS POSITIVE OR NEGATIVE?
Akinori Ono,Yuka Eguro,Taichi Narisawa,Naoki Nomura,Takaya Sato,Yuna Sato,Yuta Shibamoto,Soichiro Yoshida 글로벌지식마케팅경영학회 2017 Global Fashion Management Conference Vol.2017 No.07
Some clothing manufacturers and retailers use attractive endorsers on their advertising. However, according to recent research, consumers with low body esteem evaluate the clothing items more negatively when they try them on in the fitting room and find that they are inferior to the attractive advertising endorser wearing the same items (Dahl, Argo, & Morales, 2012). Is it always true? Should clothing companies not use attractive endorsers? When Dahl, et al. (2012) emphasized the negative impact of an attractive endorser and discussed body esteem, they implicitly assumed body-related consumption, in which consumers wear clothing items to enrich their physical appearance. However, other research on fashion has suggested that consumers often wear clothing items for self-expression (e.g., Piacentiti & Malier, 2004). Luxury fashion brands have been particularly regarded as symbols of wealth, so consumers wear luxury fashion clothing items to show off their high status (Shavitt, 1989; Wilcox, Kim & Sen, 2009). Thus, status-related consumption should be considered in addition to body-related consumption. Considering status-related consumption, this research introduces another kind of self-esteem, i.e., status esteem, which refers to how confident consumers are in their status. Assuming that there are two types of self-esteem, body esteem (or external esteem) and status esteem (or internal esteem), both of which are related to clothing, we hypothesize that consumers low in status esteem will evaluate a status-related product more positively than consumers high in status esteem when their consumption aligns (vs. when it does not align) with an attractive endorser even though they are low in body esteem. To test the hypothesis, we conducted three laboratory experiments. The result of multiple regression analysis showed that our hypothesis was supported. By suggesting that even consumers with low body and status esteem can evaluate status-related product positively, when finding that they are inferior to the advertising endorser in terms of body, this research expands our understanding on how attractive advertising endorsers affect consumer evaluation of clothing items focusing on two kinds of selfesteem, body and status esteem.