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18 results on '"Lv, Mingxia"'

14. Synthesis and photoluminescence properties of SrGdLiTeO6:Sm3+ as near UV excited phosphors.

Author

Liu, Shan, Lv, Mingxia, Zhou, Jun, Zhu, Yaohui, Hu, Rong, Li, Xiong, and Xu, Denghui

Abstract

A series of double-perovskite SrGd1−xLiTeO6:xSm3+ phosphors were made using the solid-state reaction approach, and the effects of various Sm3+ doping concentrations on the luminescence characteristics were investigated. In the range from 350 to 500 nm, several absorption bands of Sm3+ ions can be seen in the diffuse reflectance spectrum of SrGd0.97LiTeO6:0.03Sm3+. Under 406 nm excitation, the photoluminescent spectra show it has efficient orange–red emission, owing to the transitions of 4G5/2 to 6H5/2, 4G5/2 to 6H7/2, 4G5/2 to 6H9/2 and 4G5/2 to 6H11/2, respectively. The synthesized phosphors have relatively thermal stability properties, with the temperature goes up to 425 K, the luminescence intensity remains at 85% of its original value. These results demonstrate the SrGd1-xLiTeO6:xSm3+ phosphors are expected to be used as near UV excited phosphors. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Cultural difference: Can it influence University rankings?

Author

Lv Mingxia

Subjects
General method, Cultural perspective, Higher education, business.industry, 05 social sciences, 050905 science studies, Weight difference, Unit (housing), Globalization, Ranking, Cultural diversity, 0502 economics and business, Econometrics, 0509 other social sciences, Marketing, business, Psychology, 050203 business & management
Abstract

The present global higher educational milieu is typified by its preoccupation with rankings. The inter-connectedness that has resulted from globalization has facilitated methodization of higher education systems the world over. However, there are some important deficiencies of university ranking indexes such as taking into account the whole university as a single unit without differentiating according to different fields of study or research, being limited to some well-known universities, and not considering institutional characteristics such as size or age. This study aims to explore the leading global university rankings to determine the differences in terms of their ranking criteria, main indicators, modeling choices, and the effects of these on the rankings. By using the general method of statistics, we try to analysis the weight difference of the main indicators of the university rankings from a cultural perspective. We considered that the cultural differences fundamentally lead to the deviation of the weight difference of the indicators; constituting the direction deviation from the method and impacting the stability of the rankings from the result.

Published
2017

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