Sökning: "Ir 100"

Visar resultat 1 - 5 av 53 avhandlingar innehållade orden Ir 100.

  1. 1. Model catalysts studied by x-rays, visible and infrared light

    Författare :Stefano Albertin; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High Energy Surface X-ray Diffraction; X-ray Photoelectron Spectroscopy; oxidation; Pd 100 ; PdO; Ir 100 ; IrO2; in-situ; operando; Surface Optical Reflectance;

    Sammanfattning : This work is focused on the study of transition metal model catalysts for gas-phase heterogeneous catalysis, studied with light-based in-situ and operando techniques.Metallic model catalysts, such as Palladium (Pd) and Iridium (Ir) single crystals and in minor part deposited Rhodium (Rh), were studied using a combination of x-ray and non x-ray techniques. LÄS MER

  3. 2. Theoretical modeling of x-ray and vibrational spectroscopies applied to liquid water and surface adsorbates

    Författare :Mathias P. Ljungberg; Lars Pettersson; Shaul Mukamel; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; water; XAS; XES; IR; Raman; Chemical physics; Kemisk fysik; kemisk fysik; Chemical Physics;

    Sammanfattning : This thesis presents results of theoretical modeling of x-ray and vibrational spectroscopies applied to liquid water and to CO adsorbed on a Ni(100) surface. The Reverse Monte Carlo method is used to search for  water structures that reproduce diffraction, IR/Raman and x-ray absorption by fitting them to experimental data and imposed constraints. LÄS MER

  4. 3. Spectral Analysis of Neutron Capture Elements in the Laboratory and Stars

    Författare :Martin Lundqvist; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmic chemistry; Astronomy; space research; Atom- och molekylärfysik; Atomic and molecular physics; Astronomi; Sm; Hf; Os; Ir; Neutron capture processes; rymdvetenskap; kosmisk kemi; cool stars; Spectroscopy; atomic data;

    Sammanfattning : The pedigree of the elements heavier than iron is a vital question in the history and evolution of our galaxy. The elements up to and including those of the iron group are produced mainly through fusion processes within stars, giving the stars their energy. LÄS MER

  5. 4. TDMA for Low Sampling Rate IR-UWB Receivers

    Författare :Muhammad Adeel Ansari; Svante Signell; Ramir Eghbali; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In UWB communication sampling plays a key role in detection of the transmitted data. There are various methods of data transmission and detection at the receiver. Mostly, the detection methods are based on frequency domain methods. LÄS MER

  7. 5. The OH/IR Star Population in the Galactic Center

    Författare :Loránt Olivér Sjouwerman; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The OH/IR stars and M-type Mira variables, that form the topic of this thesis are in two important ways different from OH/IR stars found elsewhere in the Galaxy. Their location in the central few tens of parsecs of the Galactic center allows one to study the dynamics of the Galaxy on that scale, and to investigata a population of evolved stars with a high metal abundance. LÄS MER