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A Study on the Deintercalation Reaction of Li-Graphite Intercalation Compounds
오원천,김범수,O, Won Cheon,Kim, Beom Su Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.1
Li-graphite intercalation compounds (GICs), synthesized at elevated temperature and pressure, were allowed to decompose spontaneously in the atmosphere. The decomposition processes were analyzed by of X-ray diffraction, DSC analysis, FT-IR measurements, UV/VIS spectrophotometry. The deintercalation reaction of the Li-GICs ceased after 6 weeks and only the residual compounds could be observed. A strong exothermic reaction was observed at 300 $^{\circ}C$ in thermal decomposition, and relatively stable decomposition curves were formed. A few endothermic curves have been observed at 1000 $^{\circ}C.$ After 6 weeks deintercalation reaction time of GICs, many exothermic and endothermic reactions were accompanied at the same time. In addition the reactions of the functional groups such as aromatic rings, nitrogen, $-CH_3$, $-CH_2$ etc. of GDIC obtained by the above reaction were confirmed by FT-IR spectrum. UV/VIS spectrophotometric measurement clearly shows the formation of a minimum energy value ($R_{min}$) for the compounds between Li-GICs as a starting material and Li-GDICs obtained until after 3 weeks of the deintercalation reaction, while they were no clear energy curves from 4 weeks of reaction time, because of the formation of the graphite structure, of high stages and of the Li compounds surrounding the graphite in the deintercalation reaction.
Residents’ support for event tourism: Comparison of residents’ place image and event attachment
원천,박근수 한국관광연구학회 2019 관광연구저널 Vol.33 No.10
The rise of event tourism has brought significant impacts on economy, society, culture, and environment to host cities. Understanding residents’ perception of event impacts and their supports is an important part to the sustainable development of event tourism. Despite as the trust, place involvement and other antecedent latent variables examined as effective predictors of residents’ attitudes toward event tourism, residents’ place image and their event attachment are still rarely discussed. Based on the Social Exchange Theory (SET), residents’ perceived event impact latent is used as the mediator by this study, and the model relationship between residents’ place image, event attachment and their supports for event is constructed. AMOS and SPSS PROCESS are used to calculate model’s structural-relation and the mediation effects, respectively. Findings suggest that (a) a direct positive relationship exists between residents’ perceived positive event impacts and their support for it, a direct negative relationship exists between residents’ perceived negative event impacts and their support for it; (b) a direct positive relationship exists between resident’s place image, event attachment and their supports toward event, and event attachment’s path coefficient is higher than place image; (c) the relationship between residents’ place image, event attachment and their supports toward event is mediated by their perceived positive event impacts, but is not significantly mediated by their perceived negative event impacts.