Sökning: "extraction"

Visar resultat 1 - 5 av 1095 avhandlingar innehållade ordet extraction.

  1. 1. Recent Extraction Techniques with Emphasis on Supercritical Fluid Extraction and Microwave-assisted Extraction

    Detta är en avhandling från Cecilia Sparr Eskilsson, Analytical Chemistry, Lund University

    Författare :Cecilia Sparr Eskilsson; Lund University.; Lunds universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; Pressurized hot water extraction; Pressurized liquid extraction; Microwave-assisted extraction; Recent extraction techniques; Supercritical fluid extraction;

    Sammanfattning : Today’s requirements of fast, reliable and selective analytical methods with minimal usage of organic solvents have accelerated the development of new, automated extraction techniques. In this thesis recent extraction techniques with emphasis on supercritical fluid extraction (SFE) and microwave-assisted extraction (MAE) were investigated. LÄS MER

  2. 2. Medical knowledge extraction : application of data analysis methods to support clinical decisions

    Detta är en avhandling från Linköping : LJ Foto & Montage

    Författare :Ankica Babic; Linköpings universitet.; Linköpings universitet.; [1993]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; knowledge extraction; multivariate statistics; inductive learning; rough sets; non-specified liver diseases; decision support; MEDICINE; MEDICIN;

    Sammanfattning : In building computer based clinical decision support extensive data analysis is sought to acquire all the medical knowledge needed to formulate the decision rules.This study explores, compares and discusses several approaches to knowledge extraction from medical data. LÄS MER

  3. 3. Analysis of Acrylamide and Anthocyanins in Foods Extraction Optimization for Challenging Analytes

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Erik V. Petersson; Uppsala universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analysis; Extraction; Optimization; Acrylamide; Anthocyanins; Foods; Challenges; NATURAL SCIENCES Chemistry Analytical chemistry; NATURVETENSKAP Kemi Analytisk kemi; Analytical Chemistry; Analytisk kemi;

    Sammanfattning : In this thesis, the main concern has been to improve the reliability of different parts of the analytical workflow (Paper I, II, IV &V). Additionally, one of the resulting optimized methods was used in a real application (Paper III).Paper I-II concerned the extraction of acrylamide (AA) from foods. LÄS MER

  4. 4. Pressurized Fluid Extraction A Sustainable Technique with Added Values

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Monica Waldebäck; Uppsala universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; ASE; biomass; green chemistry; household waste; lipid; pesticide; PFE; pressurized fluid extraction; sediment; Analytisk kemi; NATURAL SCIENCES Chemistry Analytical chemistry; NATURVETENSKAP Kemi Analytisk kemi;

    Sammanfattning : The challenge for the future was defined by the Brundtland Commission (1987) and by the Rio Declaration (1992), in which the fundamental principles for achieving a sustainable development were provided. Sustainable chemistry can be defined as the contribution of chemistry to the implementation of the Rio Declaration. LÄS MER

  5. 5. New methods for determination of airborne pollutants Focus on tetrabromobisphenol A, organophosphate triesters and polycyclic aromatic hydrocarbons

    Detta är en avhandling från Stockholm : Department of Analytical Chemistry, Stockholm University

    Författare :Johanna Tollbäck; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Air sampling; sampling methods; indoor air; SPE; SPME; extraction; dynamic extraction; online coupling; SWE; subcritical water extraction; GC MS; LC MS; organophosphate triesters; PAH; tetrabromobisphenol A; NATURAL SCIENCES Chemistry Analytical chemistry; NATURVETENSKAP Kemi Analytisk kemi; analytisk kemi; Analytical Chemistry;

    Sammanfattning : The work presented in this thesis concerns the development and evaluation of new methods of sampling and analysis of organic pollutants in the indoor and outdoor environment.In Paper I, the development of a new method was reported for the determination of the brominated flame retardant tetrabromobisphenol A (TBBPA) in air using sampling with glass fiber filter and polyurethane foam (PUF), ultrasonic solvent extraction and liquid chromatography coupled to electrospray ionisation mass spectrometry (LC-ESI/MS). LÄS MER