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Singapore Preschool Teachers' Responses to the Introduction of A Framework for a Kindergarten Curriculum in the Context of 3 Preschool Settings
Lynn Ang Ling-Yin 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 27 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2008, Vol.2 No.1 4 55-81 (27 pages)
This paper is based on a British Academy funded research proj ect on teachers' responses to the introduction of the Singapore preschool curriculum titled A Framework for a Kindergarten Curriculum (Ministry of Education, 2003 ) . 1 5 teachers from 3 preschools were interviewed and their views analyzed to identify issues in the implementation of the new curriculum. The teachers in this pilot study welcomed the curriculum framework but had reservations about it. For them, the three main issues were... -
Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI)
Jiaqi Duan, Baohua Zhang, Huailin Fan, Wenzhong Shen, Shijie Qu 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 7 60-69 (10 pages)
Nitrogen-doped carbon nanosheets with a developed porous structure were prepared from polyurethane foams by hydrothermal carbonization following ZnCl2 chemical activation. Scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, solid state 13C nuclear magnetic resonance (NMR) spectra and X-ray photoelectron spectroscopy were used to characterize the nitrogen-doped carbon nanosheet structure and composition. The removal of Cr(VI) by the N-doped carbon... -
Molecular approach to hexagonal and cubic diamond nanocrystals
Mudar Ahmed Abdulsattar 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 5 192-197 (6 pages)
In the present work, we propose a molecule (C14H14) that can be used as a building block of hexagonal diamond-type crystals and nanocrystals, including wurtzite structures. This molecule and its combined blocks are similar to diamondoid molecules that are used as building blocks of cubic diamond crystals and nanocrystals. The hexagonal part of this molecule is included in the C12 central part of this molecule. This part can be repeated to increase the ratio of hexagonal to cubic diamond and... -
Mechanisms of Na adsorption on graphene and graphene oxide: density functional theory approach
Hye Sook Moon, Ji Hye Lee, Soonchul Kwon, Il Tae Kim, Seung Geol Lee 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 7 116-120 (5 pages)
We investigated the adsorption of Na on graphene and graphene oxide, which are used as anode materials in sodium ion batteries, using density functional theory. The adsorption energy for Na on graphene was -0.507 eV at the hollow sites, implying that adsorption was favorable. In the case of graphene oxide, Na atoms were separately adsorbed on the epoxide and hydroxyl functional groups. The adsorption of Na on graphene oxide-epoxide (adsorption energy of -1.024 eV) was found to be stronger than... -
The effects of stacking sequence on the penetration-resistant behaviors of T800 carbon fiber composite plates under low-velocity impact loading
Furqan Ahmad, Jung-Wuk Hong, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 6 107-115 (9 pages)
Impact damages induced by a low-velocity impact load on carbon fiber reinforced polymer (CFRP) composite plates fabricated with various stacking sequences were studied experimentally. The impact responses of the CFRP composite plates were significantly affected by the laminate stacking sequences. Three types of specimens, specifically quasi-isotropic, unidirectional, and cross-ply, were tested by a constant impact carrying the same impact energy level. An impact load of 3.44 kg, corresponding to...
