Sökning: "metamorphic"

Visar resultat 1 - 5 av 63 avhandlingar innehållade ordet metamorphic.

  1. 1. Optimization of Metamorphic Materials on GaAs Grown by MBE

    Författare :Yuxin Song; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; molecular beam epitaxy; GaAs; InGaAs; threading dislocation; alloy graded buffer; heterostructures; metamorphic;

    Sammanfattning : Advanced epitaxial technologies such as molecular beam epitaxy (MBE) and metal-organic vapor phase epitaxy (MOVPE) have enabled the idea of semiconductor heterostructures, which built up the foundation of the fast developing information and communication technology nowadays. Lattice mismatch has been a problem limiting designs of semiconductor heterostructures. LÄS MER

  2. 2. Metamorphic zircon formation in gabbroic rocks – the tale of microtextures

    Detta är en avhandling från Lund University, Faculty of Science, Department of Geology, Lithosphere and Biosphere Science

    Författare :Victoria Beckman; Lunds universitet.; Lund University.; [2018-04]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zircon formation; metamorphism; prograde; gabbr; zircon; baddeleyite; zircon; baddeleyite; metamorphic; prograde; zircon textures;

    Sammanfattning : Jordens plattektoniska rörelser leder till tektoniska skeenden vid plattgränserna, bland annat bergskedjebildning, då berggrunden utsätts för förändringar i tryck och temperatur. Vid ändrat tryck och ändrad temperatur förändras också bergarter: de ursprungliga mineralen konsumeras i kemiska reaktioner och i stället bildas nya mineral som är stabila vid de nya fysikaliska förhållandena - en process som kallas metamorfos. LÄS MER

  3. 3. Metamorphic Heterostructures and Lasers on GaAs

    Detta är en avhandling från Lund University, Faculty of Science, Department of Geology, Lithosphere and Biosphere Science

    Författare :Ivar Tångring; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; metamorphic heterostructures; InGaAs quantum well; graded buffer layer; Semiconductor laser; GaAs; molecular beam epitaxy; telecom laser;

    Sammanfattning : The objective of this thesis is to demonstrate the metamorphic growth of heterostructure lasers on GaAs substrates. Many heterostructure devices have their performance limited by the need to grow on lattice-matched substrates. LÄS MER

  4. 4. Fluid-induced alteration of metasedimentary rocks in the Scottish Highlands

    Detta är en avhandling från Stockholm : Department of Geological Sciences, Stockholm University

    Författare :Alexander Lewerentz; Stockholms universitet.; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metamorphic fluids; metamorphic fluid flow; fluid-rock interaction; metamorphic fluid fluxes; Geology; geologi;

    Sammanfattning : Fluids, mainly H2O and CO2, are released from H- and C-bearing phases during prograde metamorphism. Because of the buoyancy of these fluids, they rise within the crust towards the surface of the Earth. Metamorphic fluids take advantage of permeable horizons, shear zones, fold hinges, fractures, and are channelled into high-flux zones. LÄS MER

  5. 5. How do metamorphic fluids move through rocks? An investigation of timescales, infiltration mechanisms and mineralogical controls

    Detta är en avhandling från Stockholm : Department of Geological Sciences, Stockholm University

    Författare :Barbara I. Kleine; Stockholms universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Metamorphic fluid flow; fluid-rock interaction; fluid infiltration mechanisms; fluid flux rates; thermodynamic modeling; reaction front propagation; fluid flux calculation; Geology; geologi;

    Sammanfattning : This thesis aims to provide a better understanding of the role of mountain building in the carbon cycle. The amount of CO2 released into the atmosphere due to metamorphic processes is largely unknown. LÄS MER