http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Nirmala W. (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
The Hong Kong Early Child Development Scale-3: A Validation Study
Nirmala Rao,Stephanie W. Y. Chan,Rhoda Wang,Diana Lee,Rita Y. T. Ng,Yvonne Becher,Carrie Lau,Jin Sun,Frederick K Ho,Patrick Ip The Pacific Early Childhood Education Research Ass 2022 Asia-Pacific journal of research in early childhoo Vol.16 No.2
The Hong Kong Early Child Development Scale (HKECDS) is a tool for assessing holistic early child development in preschoolers aged from three to six years. The original version of the scale, HKECDS, was updated in 2019 (HKECDS-2) to reflect the contemporary context and local curricular expectations. Children (n = 144) from three kindergartens in Hong Kong completed the HKECDS-2 in individual sessions. Rasch model analysis and expert discussions resulted in a short version of the scale (HKECDS-3) with 50 items in nine domains. The domains are Personal and self-care (4 items), Language development (7 items), Pre-academic learning (10 items), Cognitive development (6 items), Gross motor (4 items), Fine motor (2 items), Health and safety (5 items), Moral development (6 items), and Society and environment (6 items). There were significant correlations between findings from the updated version of the tool, HKECDS-3 and the HKECDS-2 (long form), and older children had significantly higher scores than younger children.
-
Nirmala, R,Jang, Kwang-Hyun,Sim, Hasung,Cho, Hwanbeom,Lee, Junghwan,Yang, Nam-Geun,Lee, Seongsu,Ibberson, R M,Kakurai, K,Matsuda, M,Cheong, S-W,Gapontsev, V V,Streltsov, S V,Park, Je-Geun Institute of Physics 2017 Journal of Physics, Condensed Matter Vol.29 No.13
<P>CuAl<SUB>2</SUB>O<SUB>4</SUB> is a normal spinel oxide having quantum spin, <I>S</I> = 1/2 for Cu<SUP>2+</SUP>. It is a rather unique feature that the Cu<SUP>2+</SUP> ions of CuAl<SUB>2</SUB>O<SUB>4</SUB> sit at a tetrahedral position, not like the usual octahedral position for many oxides. At low temperatures, it exhibits all the thermodynamic evidence of a quantum spin glass. For example, the polycrystalline CuAl<SUB>2</SUB>O<SUB>4</SUB> shows a cusp centered at ~2 K in the low-field dc magnetization data and a clear frequency dependence in the ac magnetic susceptibility while it displays logarithmic relaxation behavior in a time dependence of the magnetization. At the same time, there is a peak at ~2.3 K in the heat capacity, which shifts towards a higher temperature with magnetic fields. On the other hand, there is no evidence of new superlattice peaks in the high-resolution neutron powder diffraction data when cooled from 40 to 0.4 K. This implies that there is no long-ranged magnetic order down to 0.4 K, thus confirming a spin glass-like ground state for CuAl<SUB>2</SUB>O<SUB>4</SUB>. Interestingly, there is no sign of structural distortion either although Cu<SUP>2+</SUP> is a Jahn–Teller active ion. Thus, we claim that an orbital liquid state is the most likely ground state in CuAl<SUB>2</SUB>O<SUB>4</SUB>. Of further interest, it also exhibits a large frustration parameter, <I>f</I> = |<I>θ</I> <SUB>CW</SUB>/<I>T</I> <SUB>m</SUB>| ~ 67, one of the largest values reported for spinel oxides. Our observations suggest that CuAl<SUB>2</SUB>O<SUB>4</SUB> should be a rare example of a frustrated quantum spin glass with a good candidate for an orbital liquid state.</P>
-
Jeon, K.S.,Nirmala, R.,Navamathavan, R.,Kim, K.J.,Chae, S.H.,Kim, T.W.,Kim, H.Y.,Park, S.J. North-Holland 2014 Materials Letters Vol.132 No.-
This paper presents a relatively simple and low-cost approach to prepare Al<SUB>2</SUB>O<SUB>3</SUB> coated with electrospun meta-aramid nanofibers. These Al<SUB>2</SUB>O<SUB>3</SUB>/meta-aramid composite nanofiber mats can be directly used as separating membrane in rechargeable lithium-ion batteries. The manufacture, characteristics, performance and modifications of these Al<SUB>2</SUB>O<SUB>3</SUB>/meta-aramid composite nanofiber separators are introduced and discussed. In cell test, the capacity efficiency of Al<SUB>2</SUB>O<SUB>3</SUB> coated M-aramid nanofibers separator was much better than that of M-aramid nanofibers. The LiCoO<SUB>2</SUB>/graphite cells assembled with the Al<SUB>2</SUB>O<SUB>3</SUB> ceramic coated M-aramid nanofibers separator exhibited reversibility up to 4.2V with a 232mAh/g discharge capacity. Among numerous battery separators, the thermal shutdown and ceramic based separators are of special importance in enhancing the safety of lithium-ion batteries.
-
Kumari S. Senthil,Nirmala W.,Chidhambaram N.,Prabu M.,Ganesh V.,Yahia I. S. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.4
This report outlines the photo sensing and photocatalytic properties of the Sb-doped ZnO nanopowders synthesized using the co-precipitation method. According to X-ray diffraction analyses, the produced nanopowders are polycrystalline and devoid of any secondary phase clusters. After antimony was added to the ZnO host matrix, a reduction in crystallite size was noticed. The distinct stretching vibrational modes (Zn–O and Sb–O) present in the produced nanopowders are validated using FTIR measurements. The bandgap shrinkage from 3.21 to 3.16 eV was obtained with the substitution of 5 wt% antimony in the ZnO matrix. In the case of Sb doped nanopowder samples, the reduction in ultraviolet band emission intensity was observed signifying the delayed photo-generated charge carriers recombination, which could favor the photo sensing and photocatalytic activity in ZnO. The photo sensing of the fabricated devices showed maximum responsivity (R), detectivity (D*), and external quantum efficiency (EQE) of 4.78 × 10–2 AW−1, 4.27 × 109 Jones and 11.1%, respectively for the 5% Sb-doped ZnO nanopowder. In addition, the 5% Sb-doped ZnO nanopowder photocatalysts reveal a superior degradation efficiency of 77% among other prepared photocatalysts.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
