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RISS 인기검색어
- 검색키워드
- 저자 : (Mark I . Ivy) (검색결과 2 건)
- 무료
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Dela Cruz, Ma. Ivy S.,Thongsai, Nichaphat,de Luna, Mark Daniel G.,In, Insik,Paoprasert, Peerasak Elsevier 2019 Colloids and surfaces. A, Physicochemical and engi Vol.568 No.-
<P><B>Abstract</B></P> <P>In this study, novel carbon dots were synthesized from polyurethane foam via a one-step pyrolysis method. Polyurethane foam is an interesting precursor for carbon dot synthesis because: (1) polyurethane foam waste generation is alarmingly high and (2) polyurethane is rich in nitrogen content which is important for producing highly photoluminescent carbon dots. The carbon dot synthesis parameters namely acid concentration, reaction time, and reaction temperature were modeled and optimized using Box-Behnken design (BBD) of response surface methodology (RSM). Temperature was found to be the most important parameter affecting the photoluminescence quantum efficiency of the carbon dots. The as-prepared carbon dots in aqueous solution showed a blue-green emission under UV light with a relatively high quantum yield of 33%, agreeing well with the value predicted using the RSM. The carbon dots exhibited distinct selectivity toward silver ion (Ag<SUP>+</SUP>) with a limit of detection of 2.8 μM. The Ag<SUP>+</SUP> contents in real water samples were accurately determined with acceptable repeatability. Based on these results, the RSM is a useful tool for investigating the effects of reaction parameters on the quantum efficiency of carbon dots. Furthermore, pyrolysis was proved to be an effective means for producing label-free, highly photoluminescent carbon dots from polyurethane, enabling new, effective recycling strategy and various potential sensing applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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도시녹지 내 트레일 이용에 있어서의 편익과 문제점에 관한 한 , 미간 트레일 이용자 인식의 비교 연구
이주희(Ju Hee Lee),(Roger L . Moore),(Mark I . Ivy) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.5
Interest in the development of urban trails is growing in South Korea. River front trails have been developed in Seoul, Daegu and other major cities. Such trails, and the corridors in which they are developed, often provide a myriad of benefits to the community, including open space, exercise, and stress release. This trend mirrors development patterns found in the United States and European nations. This study examined differences in trail users perceptions of trail attributes, activity participation, willingness to pay for trail access, and perceptions of trail benefits between trail users in the United States and those in South Korea. Perceptions of trail users at three trail sites in the metropolitan area of Daegu were examined, and then were compared to results reported in several studies conducted in the U. S. While this research was exploratory, it did uncover many interesting differences in perceptions of trail attributes between trail users in the two countries. This information may provide insight into the development of greenway systems in South Korea.
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