Sökning: "M Mas"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden M Mas.

  1. 1. Modelling ice surface elevation changes in Dronning Maud Land, East Antarctica : Bridging the gap between in-situ and numerical model reconstructions

    Författare :Martim Mas e Braga; Arjen P. Stroeven; Irina Rogozhina; Jonathan M. Harbor; Clas Hättestrand; Frank Pattyn; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ice sheet modelling; glaciology; paleoglaciology; naturgeografi; Physical Geography;

    Sammanfattning : Ice sheets are an active component of Earth's climate system. Their topography influences atmospheric circulation and changes in their volume alters freshwater fluxes to the oceans, affecting ocean water masses, atmospheric carbon uptake, and global sea level. LÄS MER

  3. 2. Side-chain oxidized oxysterols as metabolic regulators in liver and brain

    Författare :Zeina M F Ali; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Oxysterols are oxygenated derivatives of cholesterol characterized by a very short half-life and their ability to pass lipophilic membranes easily, thus they are considered as important intermediates in cholesterol excretion pathways and its conversion to bile acids. The two major oxysterols in the circulation of human and mouse are 24S-hydroxycholesterol (24S-OH) and 27-hydroxycholesterol (27-OH), which are formed by the cytochrome P450 enzymes cholesterol 24-hydroxylase (CYP46A1) and sterol 27-hydroxylase (CYP27A1), respectively. LÄS MER

  4. 3. Preparation and characterization of collodial suspensions of ZSM-5 type zeolites

    Författare :Anders Persson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicalite-1; redisperison; FTi.r.; monodisperse; ZSM-5; colloidal zeolite; 27< sup>A1 MAS n.m.r.; dynamic light scattering;

    Sammanfattning : .... LÄS MER

  5. 4. Quality aspects in direct shear testing of rock joints

    Författare :Jörgen Larsson; Fredrik Johansson; Alejano Leandro; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rock joints; geometrical quality assurance; replicas; direct shear testing; normal stiffness; bergssprickor; geometrisk kvalitetssäkring; replikor; skjuvhållfasthetprovning; normalstyvhet.; Jord- och bergmekanik; Soil and Rock Mechanics;

    Sammanfattning : The stability of rock masses is influenced by the occurrence of rock joints. Therefore, the shear strength of rock joints must be considered in dimensioning of underground constructions. LÄS MER

  7. 5. Landscape partitioning and burial processes of soil organic carbon in contrasting areas of continuous permafrost

    Författare :Juri Palmtag; Peter Kuhry; Gustaf Hugelius; Stephan Gruber; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; soil organic carbon; total nitrogen; permafrost; cryoturbation; geomorphology; land cover classification; slope processes; texture; upscaling; carbon nitrogen ratio; Physical Geography; naturgeografi;

    Sammanfattning : Recent studies have shown that permafrost soils in the northern circumpolar region store almost twice as much carbon as the atmosphere. Since soil organic carbon (SOC) pools have large regional and landscape-level variability, detailed SOC inventories from across the northern permafrost region are needed to assess potential remobilization of SOC with permafrost degradation and to quantify the permafrost carbon-climate feedback on global warming. LÄS MER