Sökning: "vakuum"

Visar resultat 11 - 15 av 26 avhandlingar innehållade ordet vakuum.

1. 11. The effect of surface steps and oxides on the catalytic activity on model Pd and Rh catalysts

   Författare :Chu Zhang; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Surface X-ray diffraction SXRD ; X-ray photonelectron spectroscopy; Catalytic activity; Oxide; Single Crystal surface; surface structure; vicinal surface; CO oxidation; stepped surface; Fysicumarkivet A:2018:Zhang;

   Sammanfattning : A catalyst is a substance that can speed up the rate of a chemical reaction without itself being consumed. Catalysts are crucial for chemical production industries, where about 90% of all chemicals are produced using catalysts. LÄS MER

3. 12. In situ structural studies and gas phase visualization of model catalysts at work

   Författare :Sara Blomberg; Synkrotronljusfysik; []
   Nyckelord :CO-oxidation; model catalysts; AP-XPS; PLIF; Pd; Rh; PdAg; Fysicumarkivet A:2017:Blomberg;

   Sammanfattning : This thesis reports on in situ structural studies relevant to a catalytic surface during CO oxidation. The materials that have been studied are palladium, rhodium and an alloy of palladium and silver, with applications in emission cleaning by catalytic converters in vehicles. LÄS MER

4. 13. Specialiserad biståndshandläggning inom den kommunala äldreomsorgen : Genomförandet av en organisationsreform och dess praktik

   Författare :Staffan Blomberg; Socialhögskolan; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; care manager; organizational reform; organizational model; needs-assessment; New Public Management; neo-institutional organization theory; editing; institutionalization; bureaucratic control; diffusion; organizational fashion; professions; elderly care; Social changes; theory of social work; Sociala förändringar; teorier om socialt arbete;

   Sammanfattning : The 1990s was a period characterized by a strong pressure for reform in the Swedish municipalities. The care manager reform, i.e. the initiation of a position within the administration - the care manager - whose work tasks are concentrated around needs-assessment practices only, was one of many reform proposals. LÄS MER

5. 14. Oxidation of some Late Transition Metal Surfaces: Structural Studies from UHV to Atmospheric Pressure

   Författare :Johan Gustafson; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kondenserade materiens egenskaper:struktur; phase equilibria; crystallography; thermal and mechanical properties; Condensed matter:stucture; density functional theory; scanning tunneling microscopy; surface x-ray diffraction; high resolution core level spectroscopy; low energy electron diffraction; metal surfaces; oxidation; catalysis; egenskaper termiska och mekaniska ; kristallografi; fasjämvikt;

   Sammanfattning : The oxidation of Rh, Pd and Pt is studied under conditions ranging from ultra high vacuum to ambient pressures, with emphasis on a complete understanding of the geometry of the various oxide structures found. The investigations use a combination of various experimental methods, including high resolution core level spectroscopy, low energy electron diffraction, surface x-ray diffraction and scanning tunneling microscopy, as well as density functional theory calculations. LÄS MER

7. 15. Electron beam sizes and lifetimes at MAX II and MAX III

   Författare :Anders Rosborg; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electron accelerator; Storage ring; Synchrotron light source; Synchrotron radiation; Electron beam profile; Emittance; Beam size; Fysicumarkivet A:2012:Hansson; Lifetime; Bunch length; Landau cavities;

   Sammanfattning : The MAX II and MAX III synchrotron light sources at MAX-lab provide synchrotron radiation for experiments in a wide variety of research fields. The synchrotron radiation is emitted by ultra-relativistic electrons circulating in electron storage rings. LÄS MER