The present study aimed to investigate the application of the CLAN （Computerized Language Analysis） program in the CHILDES （Child Language Data Exchange System） on shared and unique words between storybooks. Sixty...The present study aimed to investigate the application of the CLAN （Computerized Language Analysis） program in the CHILDES （Child Language Data Exchange System） on shared and unique words between storybooks. Sixty sixth-grade Chinese-speaking children at an elementary school in Taipei City were recruited. Forty-four three-level of storybooks from Kizclub were collected and analyzed. Fifteen minutes reading instruction was followed by the use of CLAN on storybooks for 25 minutes. Children were given written and spoken vocabulary tests after each cluster of storybook reading period. There were three main findings of the study. First, young EFL （English as a Foreign Language） learners＇ word learning was enhanced through multiple exposures to the shared and unique words from the storybooks. Second, word instruction in isolation prompted written and spoken word learning beyond word instruction in context and repeated reading. Third, the results had pedagogical implications on the value and feasibility of language teaching with storybooks in promoting EFL students＇ word learning by using CLAN, and the limitations of the study were provided.展开更多
Dy3+/Eu3+ co-doped cubic lattice Na YF4 single crystal with high quality in the size of ~Φ1.0 cm×10.0 cm was grown by an improved Bridgman method using potassium fluoride(KF) as assistant flux. X-ray diffraction...Dy3+/Eu3+ co-doped cubic lattice Na YF4 single crystal with high quality in the size of ~Φ1.0 cm×10.0 cm was grown by an improved Bridgman method using potassium fluoride(KF) as assistant flux. X-ray diffraction(XRD), absorption spectra, excitation spectra and emission spectra are measured to investigate the phase and luminescent properties of the crystal. The effects of excitation wavelength and concentrations of Dy3+ and Eu3+ ions on the luminescent characteristics are analyzed. The Na YF4 single crystal with the doping molar concentrations of 1.205% Dy3+ and 0.366% Eu3+ exhibits an excellent white light emission with chromaticity coordinates of x=0.321, y=0.332. It indicates that the Dy3+/Eu3+ co-doped cubic lattice Na YF4 single crystal can be a potential luminescent material for the ultraviolet(UV) light excited white light emitting diode(w-LED).展开更多
The optical characteristics of a simple, planar, single layer, dielectric Mg-based guided mode resonance filter （GMRF） were investigated by means of rigorous-coupled wave analysis （RCWA）. This filter has great pot...The optical characteristics of a simple, planar, single layer, dielectric Mg-based guided mode resonance filter （GMRF） were investigated by means of rigorous-coupled wave analysis （RCWA）. This filter has great potential for real-life applications, especially as bio- and environmental sensors. The structure of the proposed sensor is compact, and all of its layers can be grown in a single process. In this paper, we present results on the design of a water pollution sensor in the violet region of the visible spectrum. The spectral and angular sensitivities of the sensor for both the transverse electric （TE） and transverse magnetic （TM） polarization modes were estimated and compared for various regions in the violet spectrum. A spectral response characterized with a narrow bandwidth and low reflection side bands was realized by carrying out extensive parameter search and optimization. Optimal spectral and angular sensitivities were found for the sensor with a grating thickness of 100nm in the TM polarized mode where we found them to be 100nm and 40 degrees, per index refraction unit, respectively.展开更多
文摘The present study aimed to investigate the application of the CLAN （Computerized Language Analysis） program in the CHILDES （Child Language Data Exchange System） on shared and unique words between storybooks. Sixty sixth-grade Chinese-speaking children at an elementary school in Taipei City were recruited. Forty-four three-level of storybooks from Kizclub were collected and analyzed. Fifteen minutes reading instruction was followed by the use of CLAN on storybooks for 25 minutes. Children were given written and spoken vocabulary tests after each cluster of storybook reading period. There were three main findings of the study. First, young EFL （English as a Foreign Language） learners＇ word learning was enhanced through multiple exposures to the shared and unique words from the storybooks. Second, word instruction in isolation prompted written and spoken word learning beyond word instruction in context and repeated reading. Third, the results had pedagogical implications on the value and feasibility of language teaching with storybooks in promoting EFL students＇ word learning by using CLAN, and the limitations of the study were provided.
基金supported by the National Natural Science Foundation of China(Nos.51472125 and 51272109)the K.C.Wong Magna Fund in Ningbo University
文摘Dy3+/Eu3+ co-doped cubic lattice Na YF4 single crystal with high quality in the size of ~Φ1.0 cm×10.0 cm was grown by an improved Bridgman method using potassium fluoride(KF) as assistant flux. X-ray diffraction(XRD), absorption spectra, excitation spectra and emission spectra are measured to investigate the phase and luminescent properties of the crystal. The effects of excitation wavelength and concentrations of Dy3+ and Eu3+ ions on the luminescent characteristics are analyzed. The Na YF4 single crystal with the doping molar concentrations of 1.205% Dy3+ and 0.366% Eu3+ exhibits an excellent white light emission with chromaticity coordinates of x=0.321, y=0.332. It indicates that the Dy3+/Eu3+ co-doped cubic lattice Na YF4 single crystal can be a potential luminescent material for the ultraviolet(UV) light excited white light emitting diode(w-LED).
文摘The optical characteristics of a simple, planar, single layer, dielectric Mg-based guided mode resonance filter （GMRF） were investigated by means of rigorous-coupled wave analysis （RCWA）. This filter has great potential for real-life applications, especially as bio- and environmental sensors. The structure of the proposed sensor is compact, and all of its layers can be grown in a single process. In this paper, we present results on the design of a water pollution sensor in the violet region of the visible spectrum. The spectral and angular sensitivities of the sensor for both the transverse electric （TE） and transverse magnetic （TM） polarization modes were estimated and compared for various regions in the violet spectrum. A spectral response characterized with a narrow bandwidth and low reflection side bands was realized by carrying out extensive parameter search and optimization. Optimal spectral and angular sensitivities were found for the sensor with a grating thickness of 100nm in the TM polarized mode where we found them to be 100nm and 40 degrees, per index refraction unit, respectively.
