Search for dissertations about: "IRAS"

Showing result 1 - 5 of 28 swedish dissertations containing the word IRAS.

  2. 1. Quantitative in situ analysis of initial atmospheric corrosion of copper induced by carboxylic acids

    Author : Harveth Gil; Christofer Leygraf; Mark Rutland; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atmospheric corrosion; carboxylic acids; copper; in situ; IRAS; QCM; coulometric reduction.; Chemistry; Kemi;

    Abstract : The interaction of carboxylic acids with copper is a phenomenon found both outdoors and, more commonly, indoors. The influence on copper of some carboxylic acids (formic, acetic, propionic, and butyric) have so far been studied at concentrations levels at least three or four orders of magnitude higher than actual indoor conditions (< 20 ppb, volume parts per billion), and with only limited emphasis on any mechanistic approach. READ MORE

  4. 2. Atmospheric corrosion of zinc-aluminum and copper-based alloys in chloride-rich environments : Microstructure, corrosion initiation, patina evolution and metal release

    Author : Xian Zhang; Inger Odnevall Wallinder; Christofer Leygraf; Manuel Morcillo; KTH; []
    Keywords : atmospheric corrosion; chloride deposition; Zn-Al alloy coatings on steel microstructure; Cu sheet and Cu alloys; microstructure; corrosion initiation; corrosion product evolution; metal release; SEM; IRAS; CRM.; Kemi; Chemistry;

    Abstract : Fundamental understanding of atmospheric corrosion mechanisms requires an in-depth understanding on the dynamic interaction between corrosive constituents and metal/alloy surfaces. This doctoral study comprises field and laboratory investigations that assess atmospheric corrosion and metal release processes for two different groups of alloys exposed in chloride-rich environments. READ MORE

  5. 3. Star formation and molecular outflows

    Author : Lewis Benjamin Graham Knee; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mass outflow; IRAS; molecular clouds; molecular spectral lines;

    Abstract : .... READ MORE

  6. 4. Molecules at stellar death: from the winds of massive evolved stars to supernova remnants

    Author : Sofia Wallström; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; stellar mass-loss; supernova remnants; circumstellar matter; IRAS 17163-3907; yellow hypergiant stars; Cassiopeia A;

    Abstract : Massive stars play a key role in the chemical and dust budget of the galaxy, producing heavy elements, molecules, and dust. At the end of their lives they evolve through stages of significant mass-loss which affect the subsequent evolution of the star, including whether or not it will eventually explode as a supernova (SN). READ MORE

  7. 5. Methanol masers reveal the magnetic field of a high mass protostar

    Author : Daria Dall` Olio; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetic field – stars: formation – stars: massive – masers – polarization – stars: individual: IRAS 18089-1732;

    Abstract : The role played by magnetic fields in high-mass star formation is not yet fully clear. Theoretical simulations have shown that magnetic fields appear to suppress fragmenta- tion in the star forming cloud, to enhance accretion via disc and to provide feedback in the form of outflows and jets. READ MORE