Sökning: "ionisation"

Visar resultat 21 - 25 av 103 avhandlingar innehållade ordet ionisation.

1. 21. Development of Micro Liquid Separation Techniques using Electrospray Ionisation Mass Spectrometry in the Analysis of Polar Compounds and Proteins/Peptides

   Författare :Jenny Samskog; Elsa Lundanes; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical chemistry; Analytisk kemi; Analytical Chemistry; Analytisk kemi;

   Sammanfattning : Electrospray ionisation (ESI) coupled to mass spectrometry (MS) is one of the most important detection techniques for chemical analysis of small drugs as well as large biomolecules in life science today. In this thesis, aspects on improved compatibility between liquid based separation systems and mass spectrometric detection were investigated regarding buffers, sample preparation and analysis of polar compounds as well as peptides and protein digests for enhanced ESI-MS performance. LÄS MER

3. 22. Microstructures for Chemical Analysis : Design, Fabrication and Characterisation

   Författare :Malin Svedberg; Fredrik Nikolajeff; Greger Thornell; Jan-Åke Schweitz; Sami Franssila; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; electrospray ionisation mass spectrometry; polymer microfabrication; paraffin actuators; hot embossing; Materialvetenskap; Materials science; Teknisk materialvetenskap;

   Sammanfattning : The interest for miniaturisation in chemical and biological analysis has increased in recent years. In this work, the design, fabrication and characterisation of tools for microanalysis have been studied. The focus is set on polymer microchips for applications in chemical analysis. LÄS MER

4. 23. Fundamental aspects of HiPIMS under industrial conditions

   Författare :Mattias Samuelsson; Ulf Helmersson; Torbjörn Joelsson; Hans Högberg; Bengt Wälivaara; Jörg Patscheider; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : Fundamental aspects of the high power impulse magnetron sputtering (HiPIMS) process and its implication for film growth under industrial conditions have been studied. The emerging HiPIMS technique exhibits a higher plasma density and an enhanced degree of ionisation of sputtered material as compared to conventional direct current magnetron sputtering (DCMS). LÄS MER

5. 24. Fine Structure and semi ordered structures : Extended energy loss fine structure investigations of semi ordered materials

   Författare :Riitta Räty; Edward A Stern; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; fysik;

   Sammanfattning : This thesis is based on structure determinations of solid materials with Extended energy loss fine structure (EXELFS) analysis. In this method the ionisation edges of a material recorded in an electron microscope are studied. The focus is on different hard materials. LÄS MER

7. 25. Studies of atomic environments in solids using EXtended Energy Loss Fine Structure, EXELFS

   Författare :Mohammad-Amirhamzeh Tafreshi; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Extended Energy Loss Fine Structure (EXELFS) is the modulations occurring at the high energy side of the ionisation edges in electron energy loss spectra. This structure turns out to be correlated to the number, distance, and type of nearby atoms as well as the inelastic mean free path for the ejected electrons, and disorder in distances from the excited atom to the atoms in an atomic shell around it. LÄS MER