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Koç University Institutional Repository
Institutional Repository
956 Publications
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  • Transmission characteristics of a bidirectional transparent screen based on reflective microlenses

    Hedili, M. Kıvanç; Ürey, Hakan; Freeman, Mark O. (2013)
    A microlens array (MLA) based see-through, front projection screen, which can be used in direct projection head-up displays (HUD), color teleprompters and bidirectional interactive smart windows, is evaluated for various performance metrics in transmission mode. The screen structure consists of a partially reflective coated MLA buried between refractive-index-matched layers of epoxy as reported in Ref [1]. The reflected light is expanded by the MLA to create an eyebox for the user. The bright...

    Flexographic artists’ books

    Alaca, Ilgım Veryeri (2016)
    This article introduces experimental artists' books created in the interstices between technology and tradition. The series of books are created by utilizing scraps produced via flexographic label printing. Each book is constituted by means of the accumulation of paper on the machine, which introduces a never-ending page structure as a result of the continuous roll, creating a swirling formation. The work is an inquiry on growth, imperfection, form and time, enriched by the impact of mechanic...

    Solar powered model vehicle races

    Yılmaz, Nazmi; Serpengüzel, Ali (2014)
    Koc University SPIE student chapter have been organizing the solar powered model vehicle race and reaching out to K-12 students. The solar powered model vehicle race for car, boat, blimp, all solar panel boat, submarine, underwater rower, amphibian, and glider have been successfully organized.

    Penetration of lightning MF signals to the upper ionosphere over VLF ground-based transmitters

    İnan, Umran Savaş; Parrot, M.; Lehtinen, N. G.; Pincon, J. L. (2009)
    The MF data recorded by the low-altitude satellite DEMETER have been used to survey the MF waves around the Earth. A global map of the MF emissions indicates that there exists a wave activity in the frequency range 2-2.5 MHz above the main powerful VLF ground-based transmitters operating in the frequency range 18-50 kHz. It is shown that this is due to the high-frequency part of whistlers induced by the thunderstorm activity. They can penetrate trough the ionosphere at the locations of the tr...
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