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Showing result 11 - 15 of 50 essays matching the above criteria.

  1. 11. Evaporation Duct Modelling for a Wave-Propagation Simulator

    University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

    Author : Oscar Eklund; [2022]
    Keywords : evaporation; duct; height; monin; obukhov; mos; surface; layer; ssft; byc; pj; businger; dyer; beljaars; holtslag; cheng; brutsaert; sheba;

    Abstract : Long-range communication proves to be a challenge due to the Earth’s curvature, since electromagnetic waves propagate away from the Earth’s surface in a free atmosphere. A possible solution to beyond line-of-sight communication is the atmospheric phenomenon known as the evaporation duct. READ MORE

  3. 12. Enhancement of translucence in fiber-based packaging materials

    University essay from KTH/Fiber- och polymerteknologi

    Author : Saila Tallinen; [2022]
    Keywords : Paper; translucent; fiber-based packages; impregnation; cellulose; papper; genomskinlighet; fiberbaserade förpackningsmaterial; impregnering; cellulosa;

    Abstract : The utilization of fiber-based packages has started to take more place at the packaging sector but is still restricted by a lack of transparency. Today this challenge is tried to be solved by paying more attention on the characteristics of nanofibers and their possibilities. READ MORE

  4. 13. PIV measurements of rotational flow in a porous medium : A masters thesis in fluid dynamics and experimental mechanics

    University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Author : Björn Skarman; [2022]
    Keywords : PIV; particle image velocimetry; velocimetry; refractive index matching; porous medium; rotational flow;

    Abstract : The purpose of this work is to test the feasibility of using particle image velocimetry(PIV) for measurements of flow through a porous medium, more specifically in this casea rotating bed reactor S3. The results from experiments preformed can then be usedto validate and improve computational fluid dynamics models. READ MORE

  5. 14. Experimental characterization of focal ratio degradation of optical fibers due to various coupling technologies

    University essay from Uppsala universitet/Institutionen för materialvetenskap

    Author : Isabella Rudengren; Julia Dahlberg; [2021]
    Keywords : Focal ratio degradation; Optical fibers; Light losses; Coupling technologies; Fusing technology; FRD; Collimated beam test;

    Abstract : The goal of this project was to develop a measuring method and software code to determine and compare the focal ratio degradation of optical fibers for two different coupling technologies. One of the couplings used a fusing technology to splice the fiber, and the other coupling used a refractive index matching technology. READ MORE

  6. 15. Investigation of Alternative Contactless Optical Surface Reconstruction Methods

    University essay from Lunds universitet/Matematisk statistik

    Author : Eric Rostedt; Rickard Bolin; [2021]
    Keywords : Geometric transformation; Principal Component Analysis; Helmholtz equation; CNN based Encoder-Decoder; Technology and Engineering;

    Abstract : Object and surface reconstruction in 3D is commonly used in production tolerance validation. Depending on the required level of accuracy, a multitude of different methods are available, each with their own advantages and disadvantages. READ MORE