Sökning: "Intresse naturvetenskap"

Visar resultat 1 - 5 av 192 avhandlingar innehållade orden Intresse naturvetenskap.

  1. 1. En problematisering av ungdomars intresse för naturvetenskap och teknik i skola och samhälle : Innehåll, medierna och utbildningens funktion

    Författare :Anders Jidesjö; Helge Strömdahl; Jari Lavonen; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Science and technology are important parts of culture. Thus today there is a need for a science education which promotes ‘science for all’ and ‘scientific literacy’ in order to prepare students for citizenship. Earlier studies indicate that many students find it hard to learn science and technology in school. LÄS MER

  3. 2. Toward a more sustainable food system using public procurement

    Författare :Elvira Molin; Anna Björklund; Skoglund Wilhelm; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; procurement; food; sustainability; criteria; Environmental Strategic Analysis; Miljöstrategisk analys;

    Sammanfattning : Around 30 % of today's anthropogenic greenhouse gas emissions originate from the food sector. Food production is the lead cause of deforestation, biodiversity loss, depletion of fish stocks, and scarcity of fresh water. LÄS MER

  4. 3. Innovative Contact Free Sensors for Metallurgical Process Control

    Författare :Donald Malmberg; Stuart M. Millman; Högskolan i Halmstad; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; microwave spectroscopy; laser; TDLAS; high temperature; gas; slag; NATURAL SCIENCES; NATURVETENSKAP; spectroscopy; slag analysis; high temperatures; Mät- och instrumenteringsteknik; Instrumentation technology; TDLAS; microwave; laser; Fysicumarkivet A:2003:Malmberg;

    Sammanfattning : The steel- and metal industry has an extensive production processing comprising many different process steps of solid, gaseous and liquid nature. Thus it is obvious that a number of different measurement technologies must be used to collect and evaluate key physical parameters which are necessary to control the production processes. LÄS MER

  5. 4. Some Extensions of Poincaré-Bendixson Theory Applied to a Resonant Converter

    Författare :Jan Melin; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Datalogi; numerisk analys; system; kontroll; numerical analysis; systems; control; Naturvetenskap; Computer science; Natural science; Poincaré-Bendixson Theory; Limit Cycles; Resonant Converter; Distributions; Piecewise Linear Systems;

    Sammanfattning : In this thesis existence and uniqueness of limit cycles are shown for a resonant converter, by extending Poincaré-Bendixson theory to non-smooth vector fields. We discuss relevant control theory and the role of simulations... LÄS MER

  7. 5. Selenium Compounds in Milk. Studies of Selenoproteins, Selenium Enrichment and Oxidative Stability of Food

    Författare :Tien Hoac; Tillämpad biokemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metabolism; Biokemi; Metabolism; Biochemistry; Naturvetenskap; Natural science; Copper; Zinc; Oxidative stability; Thioredoxin reductase; Glutathione peroxidase; Selenoproteins; Milk; Selenium supplementation; Technological sciences; Teknik;

    Sammanfattning : Selenium is an essential nutrient and in animals and humans it can either be specifically incorporated into proteins as selenocysteine or randomly as selenomethionine. It can also occur as low-molecular-weight compounds and the form of selenium in foods may also influence food quality. LÄS MER