Sökning: "refraction"

Visar resultat 16 - 20 av 72 avhandlingar innehållade ordet refraction.

  1. 16. Nonlinear response in engineered optical materials

    Författare :Gustav Strömqvist; Valdas Pasiskevicius; Peter Smith; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; nonlinear index of refraction; double tungstates; periodic poling; KTiOPO4; quasi-phase matching; parametric down-conversion; mirrorless optical parametric oscillators;

    Sammanfattning : Material and structure engineering are increasingly employed in active optical media,in this context defined as media capable of providing laser or/and optical parametric gain. For laser materials, the main aim of the engineering is to tailor the absorption and emission cross sections in order to optimise the laser performance. LÄS MER

  3. 17. Seismic structure of the central Svecofennian lithosphere

    Författare :Sebastian Buntin; Alireza Malehmir; Christopher Juhlin; Michał Malinowski; Raymond Durrheim; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wide-angle reflection refraction seismic; near-vertical incidence seismic; Moho; crust-mantle boundary; saucer-shaped sill; BABEL; FENNOLORA; UPPLAND; Fennoscandian Shield; Bergslagen; Uppland Batholith; Geofysik med inriktning mot fasta jordens fysik; Geophysics with specialization in Solid Earth Physics;

    Sammanfattning : Lithospheric structures in the Fennoscandian Shield in Sweden have been studied by a number of large-scale wide-angle seismic reflection/refraction (WARR) and normal-incidence reflection profiles since the 1960s. Among these were the over 2000 km long Fennoscandian Long Range (FENNOLORA) project in 1979 and the Baltic and Bothnian Echoes from the Lithosphere (BABEL) in 1989, which provided valuable images of the subsurface down to over 60 km depth including the Moho. LÄS MER

  4. 18. Om conisk refraction. Academisk afhandling med phil. facult. tillstånd under inseende af mag. Henr. Falck ... för philosophiska graden författad och till offentlig granskning framställd af And. Jon. Ångström Norrl. stip. Norb. å physiska auditorium d. 13 Junii 1839 p. v. t. e. m., 1. delen

    Författare :Henrik Falck; Anders Ångström; Henrik Falck; Uppsala universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 19. Pre-, peri- and postnatal influences on ophthalmologic outcome - a study on children born after intracytoplasmic sperm injection (ICSI) and children born preterm

    Författare :Margareta Hök Wikstrand; Göteborgs universitet; []
    Nyckelord :visual function; intracytoplasmic sperm injection; preterm birth; growth; insulin-like growth factor 1; postnatal development; ocular fundus morphology;

    Sammanfattning : The aims of the present study were to investigate the effects of prenatal factors in children born after intracytoplasmic sperm injection (ICSI) and peri- and postnatal factors in children born preterm on visual function and ocular fundus morphology at school age. In the children born preterm the ophthalmologic outcomes, including optic nerve morphology were analysed in relation to gestational age (GA), birth weight (BW) standard deviation score (SDS), serum levels of insulin-like growth factor I (IGF-I), weight at week 32 (SDS), and weight, length and head circumference (SDS) at school age. LÄS MER

  7. 20. 3D nano-tomography using coherent X-rays

    Författare :Maik Kahnt; Lunds universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ptychography; Tomography; Phase reconstruction; X-ray microscopy;

    Sammanfattning : X-rays allow to non-destructively investigate biological, chemical or physical processes at the nano-scale. Their high penetration depth in matter allows to investigate samples even inside sample environments, which would be difficult with complementary methods such as transmission electron microscopy (TEM). LÄS MER