Sökning: "nitrogen iron"

Visar resultat 26 - 30 av 91 avhandlingar innehållade orden nitrogen iron.

  1. 26. Weaned Upon A Time : Studies of the Infant Diet in Prehistory

    Författare :Rachel Howcroft; Kerstin Lidén; Gunilla Eriksson; Tamsin O'Connell; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Infant Feeding; Breastfeeding; Weaning; Milk; Diet; Fertility; Neolithic; Agriculture; Hunter-Gatherer; Bronze Age; Iron Age; Prehistory; Carbon and Nitrogen Stable Isotope Ratios; Bone; Dentine; Archaeological Science; laborativ arkeologi;

    Sammanfattning : This thesis is concerned with how prehistoric infants were fed in different physical and cultural environments, and in particular what impact the economic, social, and epidemiological changes associated with the development of agriculture had on infant feeding practices. In order to examine these effects, stable isotope ratio analysis has been used to assess the duration of breastfeeding and weaning in a variety of prehistoric contexts. LÄS MER

  3. 27. X-ray studies on the binary systems of iron with nitrogen, phosphorus, arsenic, antimony and bismuth

    Författare :Gunnar Hägg; Stockholms högskola; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 28. Mössbauer studies of electron population in some iron complexes

    Författare :Ulf Helgeson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mössbauer-effekten;

    Sammanfattning : A Mössbauer effect measuring system has been constructed. With the use of a liquid helium cryostat measurements are performed at room liquid nitrogen and liquid helium temperature. A superconducting magnet with fields up to 5 Tesla has been used in the cryostat. LÄS MER

  5. 29. Towards an understanding of diazocyte development and diazotrophy in the marine cyanobacterium Trichodesmium

    Författare :Gustaf Sandh; Birgitta Bergman; Rehab El-Shehawy; Louis Sherman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; Trichodesmium; diazocyte; cell differentiation; nitrogen fixation; cell division; flavodoxin; Plant physiology; Växtfysiologi; Plant Physiology; växtfysiologi;

    Sammanfattning : Trichodesmium is a filamentous cyanobacterium of great ecological significance as it contributes significantly to primary production in oceans through an efficient nitrogen fixation strategy, including a unique cell type, the diazocyte. The aim of this thesis was to generate a deeper understanding of the structural and molecular background related to the development of diazocytes and the maintenance of diazotrophy in Trichodesmium erythraeum IMS101. LÄS MER

  7. 30. Optimizing liquid phase sintering of ferrous powder metallurgical materials

    Författare :Henrik Borgström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surface chemical analysis high speed steel; Vacuum annealing; nitrogen alloying; liquid phase sintering;

    Sammanfattning : The properties of powder metallurgical, PM, components are dependent on that the dilemma of full density and suitable microstructure is resolved. Whilst it is often possible to achieve full density, it may or may not coincide with a suitable microstructure. LÄS MER