Sökning: "analytical approach"

Visar resultat 6 - 10 av 1028 avhandlingar innehållade orden analytical approach.

1. 6. Mesoscopic superconductivity : quasiclassical approach

   Författare :Marek Ožana; Andrei Shelankov; Dierk Rainer; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mesoscopic superconductivity; quasiclassical theory; boundary conditions; multi-layer structures; Gor kov equations; quasiclassical Green s function; Green s function on classical trajectories;

   Sammanfattning : This Thesis is concerned with the quasiclassical theory of meso-scopic superconductivity. The aim of the Thesis is to introduce the boundary conditions for a quasiclassical Green’s function on partially transparent interfaces in mesoscopic superconducting structures and to analyze the range of applicability of the quasiclassical theory. LÄS MER

3. 7. Analytical Methods For Sports Drugs: Challenges and Approaches

   Författare :Hatem Elmongy; Magnus Ericsson; Leopold Ilag; Mikael Hedeland; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sports Drugs; Doping in Sports; Steroids; LC-MS MS; Chiral analysis; high-resolution mass spectrometry; Sample preparation; Biological samples; solid phase extraction; Analytical Chemistry; analytisk kemi;

   Sammanfattning : Drugs used to enhance human performance in sport competitions are prohibited by the world anti-doping association (WADA). Biological samples from athletes are continuously tested for adverse analytical findings regarding the identity and/or quantity of the banned substances. LÄS MER

4. 8. Analytical Supercritical Fluid Extraction of Lipid Containing Samples

   Författare :Mattias Järemo; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SFC; extraction cell; liquid samples; fat retainers; lipids; SFE; carbon dioxide; Analytical chemistry; Analytisk kemi;

   Sammanfattning : Traditionally, sample work-up has been associated with different kinds of liquid extraction techniques involving a large consumption of hazardous solvents. There are today regulations that aims at replacement of dangerous chemicals which has created a need for new extraction techniques. LÄS MER

5. 9. A multivariate approach to the analysis of phytoplankton pigments

   Författare :Ludvig Moberg; Olav Kvalheim; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Växtplankton; Analytical Chemistry; analytisk kemi;

   Sammanfattning : Photosynthetic pigments are routinely determined in investigations of marine and freshwater environments, chlorophyll is used as an estimator of phytoplankton biomass. Photosynthetic pigments are also widely used to characterise phytoplankton taxonomic composition. LÄS MER

7. 10. On the reliability of methods for the speciation of mercury based on chromatographic separation coupled to atomic spectrometric detection

   Författare :Johanna Qvarnström; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Mercury; speciation; hyphenated techniques; HPLC; CE; GC; CV-AAS; ICP-MS; species-specific enriched stable isotope; Analytisk kemi; Analytical chemistry; Analytisk kemi; analytisk kemi; Analytical Chemistry;

   Sammanfattning : This thesis deals with the reliability of methods for the speciation of mercury in environmental and biological samples. Problems with speciation methods that couple chromatography to atomic spectrometric detection and how to overcome the problems are discussed. LÄS MER