Search for dissertations about: "natural formation"

Showing result 11 - 15 of 2937 swedish dissertations containing the words natural formation.

  2. 11. Turbulence-Assisted Planetary Growth : Hydrodynamical Simulations of Accretion Disks and Planet Formation

    Author : Wladimir Lyra; Nikolai Piskunov; Thomas Henning; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; accretion; accretion disks; hydrodynamics; instabilities; methods: numerical; solar system: formation; planets and satellites: formation; magnetohydrodynamics MHD ; turbulence; diffusion; stars: planetary systems: formation; Astronomy and astrophysics; Astronomi och astrofysik;

    Abstract : The current paradigm in planet formation theory is developed around a hierarquical growth of solid bodies, from interstellar dust grains to rocky planetary cores. A particularly difficult phase in the process is the growth from meter-size boulders to planetary embryos of the size of our Moon or Mars. READ MORE

  4. 12. Studies of late-type stars and massive star formation regions using masers

    Author : Jiyune Yi; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; stars - stars: AGB and post-AGB; matter - techniques: interferometric; ISM: HII regions; circumstellar matter; molecules - masers - radio lines: ISM; formation; individual TX Camelopadalis ;

    Abstract : .... READ MORE

  5. 13. Th Dynamics of Star Cluster Formation

    Author : Juan Pablo Farias Osses; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Star Formation; Star Clusters; Stellar Dynamics;

    Abstract : A major question in astrophysics is how star clusters form. These objects are important, since they are the birth sites of most stars, perhaps including our own Sun. READ MORE

  6. 14. The formation and fate of planetesimals at planetary gap edges

    Author : Linn Eriksson; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Protoplanetary disks; planet-disk interactions; planetesimal formation; planetesimal dynamics; giant planet formation;

    Abstract : High resolution observations with ALMA have revealed that concentric rings and gaps are common features in protoplanetary disks. The favored mechanism for creating these substructures are planet-disk interactions, in which growing planets open gaps in the disk, and particles become trapped at the pressure maxima that form at the corresponding gap edges. READ MORE

  7. 15. Trilobites from the Middle and Upper Ordovician Andersön Shale Formation in Jämtland and the equivalent Killeröd Formation in Skåne, Sweden

    Author : Kristina Månsson; Berggrundsgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fysisk geografi; Geologi; physical geography; Geology; Sweden; Jämtland; Skåne; Upper Ordovician; Middle Ordovician; Killeröd Formation; Andersön Shale Formation; ontogeny; biostratigraphy; Trilobita; taxonomy; trilobite associations; Systematic zoology; zoogeography; Zoologisk systematik; djurgeografi; Development biology; growth animal ; embryology; Utvecklingsbiologi; ontogeni; embryologi;

    Abstract : Trilobites from the Middle and Upper Ordovician Andersön Shale Formation in Jämtland, central Sweden, and the Middle Ordovician Killeröd Formation in Skåne (Scania), southern Sweden, are revised and discussed. These formations have several genera and a few species in common, e.g. READ MORE