Browsing by Author "Wang, Ke"
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- The Condition of Education 2020Hussar, Bill; Zhang, Jijun; Hein, Sarah; Wang, Ke; Roberts, Ashley; Cui, Jiashan; Smith, Mary; Bullock Mann, Farrah; Barmer, Amy; Dilig, Rita (U.S Department of Education, National Center for Education Statistics, 2020-05-01)This report summarizes the latest data on education in the United States.This report uses data from across the center and from other sources and is designed to help policymakers and the public monitor educational progress. This year’s report includes 47 indicators on topics ranging from prekindergarten through postsecondary education, as well as labor force outcomes and international comparisons.
- Long Period Gratings in Random Hole Optical Fibers for Refractive Index SensingWang, Ke; Pickrell, Gary R. (MDPI, 2011-02-01)We have demonstrated the fabrication of long period gratings in random hole optical fibers. The long period gratings are fabricated by a point-by-point technique using a CO2 laser. The gratings with a periodicity of 450 µm are fabricated and a maximum coupling efficiency of −9.81 dB has been achieved. Sensing of different refractive indices in the surrounding mediums is demonstrated by applying standard liquids with refractive indices from 1.400 to 1.440 to the long period grating.