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Visar resultat 21 - 25 av 38 uppsatser som matchar ovanstående sökkriterier.

  1. 21. Forbidden oxygen in the Milky Way disk

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Asma Sahli; [2017]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Oxygen is produced inside massive stars and dispersed into the interstellar medium mainly through type II supernovae explosions. This element, which is the third most abundant one in the Universe, plays an important role in tracing the Galactic chemical history and evolution. LÄS MER

  3. 22. Mapping the present-day chemical abundance structure of the Solar neighbourhood: O & Si

    Master-uppsats, Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation; Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Kristiina Verro; [2017]
    Nyckelord :astrophysics; stellar spectroscopy; abundance analysis; solar neighbourhood; massive stars; Galaxy; Physics and Astronomy;

    Sammanfattning : Context. Large scale chemical abundance gradients in the Galactic disks, small-scale abundance structures, and the mean chemical abundance values in the Solar vicinity, are important constraints to Galactic chemo-dynamical formation and evolution models. LÄS MER

  4. 23. Interfaces in complex InAs-GaSb heterostructured nanowires - A transmission electron microscopy study

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Louise Uhrgård Gren; [2017]
    Nyckelord :transmission electron microscope; TEM; aberration corrected S TEM; nanowires; core-shell nanowires; InAs-GaSb; advanced characterization; Technology and Engineering;

    Sammanfattning : In this project epitaxially grown InAs-GaSb complex heterostructured nanowires have been characterized by means of aberration corrected TEM techniques and energy dispersive X-ray spectroscopy (EDX). The InAs-GaSb material is of interest due to its high charge carrier mobility, which has possible applications in electronic devices such as FETs. LÄS MER

  5. 24. Commissioning of the ΔE-E LYCCA detector array

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

    Författare :Alexander Huusko; [2017]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : LYCCA (Lund York Cologne CAlorimeter) is a versatile detector system which provides partial and residual energy measurements together with particle tracking and identification. The detector system consists of several different types of detectors such as DSSSDs (Double-Sided Silicon Strip Detector) and CsI(Tl) detectors. LÄS MER

  7. 25. The Galactic thick disk: a stellar population in its own right?

    Kandidat-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Vlad Rastau; [2017]
    Nyckelord :High resolution spectroscopy; stellar atmospheres; Galactic stellar populations;

    Sammanfattning : The Galactic disk is home of many billion stars, one of which isour Sun. The stellar population of which the Sun is a member residesin the vertically thin spiral structure of the disk. There is a seconddisk population, the so-called thick disk, that has somewhat dierentspatial, kinematic and chemical properties as compared to the thindisk. LÄS MER