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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Reflection in education : an exploration of EFL teachers' conceptions of reflective practice in the UAE

Constantinou, Helen January 2009 (has links)
This study explored how six Arab EFL teachers constructed meanings of reflection, and how these meanings informed their teaching practice. The purpose of this research was to better understand reflective practice in teacher education. Dewey (1933), Schön (1983, 1987) and van Manen’s (1977) theories on reflective practice guided this study. A symbolic interaction theoretical and methodological framework (Denzin, 1978; Prus, 1996) was applied. The data were collected from teacher interviews, reflection journals and classroom observations. Five specific themes emerged from the data and were categorised within the symbolic interaction social processes of (1) acquiring perspectives, (2) achieving individuality, (3) experiencing relationships, (4) situating the act, and (5) the act of reflection (Prus, 1996). In addition, eleven sub-themes were derived from the data which illuminated how the teachers interpreted and practised reflection. The sub-themes included: (1) defining reflection, (2) questioning as reflection, (3) opportunities for reflection, (4) defining reflection from self / significant others, (5) looking back on action, (6) reflection is based on personal beliefs and educational theory, (7) encountering peers / cooperating teachers, (8) self-reflections, (9) verbal reflections, (10) written reflections, and (11) content of reflection. The findings revealed that teachers possessed a general understanding of reflection and practised technical and interpretive levels of reflection in different contexts. Engaging in reflective practice activities encouraged the teachers to question their own beliefs and theories. The study provided evidence showing that reflection is a key element of teacher development. Reflective thinking is a vehicle that can help teachers to progress from a level where they are mainly guided by intuition to a level where their actions are guided by reflection and self-inquiry. The study has implications for the ways in which teachers learn about reflection, and I do hope that teacher educators will find it useful.
2

The design of anti-reflective coatings for a quantum cascade laser emitting light in the mid-infrared range

Bennett, Agatha Karen 10 December 2013 (has links)
Quantum cascade lasers (QCL) are semiconductor lasers that emit radiation in the mid-infrared to the terahertz (THz) range. External cavity quantum cascade lasers are broadly tunable mid-infrared and even THz laser sources that have a wide variety of applications in spectroscopy, sensing, imaging and other areas. Anti-reflection (AR) coatings, when applied on the laser facet reduce parasitic lasing, increase spectrum purity and tuning range, are crucial for good performance of external cavity systems. This report describes the process of determining the thickness of a double layer AR coating, applying the coatings to a quantum cascade laser and testing its reflectivity in the mid-infrared range. We determined the thickness of each layer of the AR coatings by building a propagation matrix model using Mathematica. We applied the coatings of Al2O3 and ZnSe using an Electron Beam Physical Vapor Deposition and a Sputtering Deposition system. Finally we tested the reflectivity of the laser by measuring a change in threshold current. The initial reflectivity of 30% was reduced to 7.7% with the addition of the AR coatings. / text
3

Light source estimation from spherical reflections

Schnieders, Dirk. January 2011 (has links)
published_or_final_version / Computer Science / Doctoral / Doctor of Philosophy
4

Über die reflexion des lichtes in einer inhomogenen schicht ...

Schlick, Moritz, January 1900 (has links)
Inaug.-diss.--Berlin. / Lebenslauf.
5

Reflection from, and transmission through, rough surfaces

Gorton, Arthur Feddeman, January 1900 (has links)
Thesis (Ph. D.)--Johns Hopkins University, 1915. / Biography. "Reprinted from the Physical review, n.s., vol. VII., no. 1, January, 1916."
6

Reflection from, and transmission through, rough surfaces

Gorton, Arthur Feddeman, January 1900 (has links)
Thesis (Ph. D.)--Johns Hopkins University, 1915. / Biography. "Reprinted from the Physical review, n.s., vol. VII., no. 1, January, 1916."
7

The selective reflection of salts of carbonic and other oxygen acids ...

Morse, Leighton B. January 1907 (has links)
Thesis (Ph. D.)--Columbia University. / Reprinted from the Astrophysical journal, vol. xxvi, no. 4, November, 1907.
8

Über die reflexion des lichtes in einer inhomogenen schicht ...

Schlick, Moritz, January 1900 (has links)
Inaug.-diss.--Berlin. / Lebenslauf.
9

Diffuse reflection of light

Berry, Eugene Manasseh. January 1900 (has links)
Thesis (Ph. D.)--University of Iowa, 1920. / Cover title. Reprinted from the Journal of the Optical Society of America and Review of scientific instruments, vol. VII, no. 8, August, 1923, and vol. VII, no. 9, September, 1923.
10

Die diffuse reflexion des lichtes an matten oberflächen ...

Thaler, Fritz, January 1903 (has links)
Inaug.-diss.--Kiel. / Vita.

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