Sökning: "iron"

Visar resultat 16 - 20 av 1580 avhandlingar innehållade ordet iron.

1. 16. Anaemia and iron deficiency in children and women in Tanzania. Effects of dietary iron intake, low iron bioavailability and supplementation with multiple micronutrient beverage

   Författare :Simon Tatala; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; serum ferritin; haemoglobin; multiple micronutrient beverage; dietary iron intake; anaemia; serum retinol; iron deficiency; children and Tanzania; pregnant women; iron bioavailability;

   Sammanfattning : Anaemia was investigated in a rural Tanzanian community to determine its magnitude and causative factors in different population groups. Nutritional anaemia resulting mainly from a diet with a low bioavailability of iron affected more than half of the total number of women and children. LÄS MER

3. 17. Barshalder 2 : Studies of late Iron Age Gotland

   Författare :Martin Rundkvist; Ingmar Jansson; Siv Kristoffersen; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Barshalder; Grötlingbo; Fide; Gotland; cemetery; graves; burial; Iron Age; Roman Iron Age; Migration Period; Vendel Period; Viking Period; landscape history; gender; typology; chronology; seriation; correspondence analysis; social stratification; status; religion; paganism; Christianity; Christianisation; Archaeology subjects; Arkeologiämnen;

   Sammanfattning : The prehistoric cemetery of Barshalder is located along the main road on the boundary between Grötlingbo and Fide parishes, near the southern end of the island of Gotland in the Baltic Sea. The ceme-tery was used from c. AD 1-1100. LÄS MER

4. 18. Biomimetic Iron Complexes involved in Oxygenation and Chlorination : A Theoretical Study

   Författare :Holger Noack; Margareta R. A. Blomberg; Per E. M. Siegbahn; Martin Kaupp; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biomimetic; iron; density functional theory; intradiol; chlorination; adpic acid; diamond core; reactivity; Bio-inorganic chemistry; Bio-oorganisk kemi; Theoretical chemistry; Teoretisk kemi; kemisk fysik; Chemical Physics;

   Sammanfattning : Biomimetic chemistry is directed towards the simulation of enzymatic reactivity with synthetic analogues. In this thesis a quantum chemical method has been employed to study the mechanism of highly reactive iron-oxo complexes involved in oxygenation and chlorination of organic substrates. LÄS MER

5. 19. Iron catalyzed C-C coupling reactions - mechanistic investigations

   Författare :Anna Hedström; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iron; homogenous catalysis; cross coupling; C-C bond formation; reaction mechanisms; kinetic investigations; competitive Hammett study; density functional theory;

   Sammanfattning : The mechanism of the iron catalyzed cross coupling of aryl electrophiles with alkyl Grignard reagents was studied. The reaction proceeds via a rate-limiting oxidative addition of the aryl halide to an Fe(I) complex generated in situ. A transmetalation from an aryl Grignard reagent occurs either before or after the oxidative addition. LÄS MER

7. 20. CVD on Iron Powder - Using Fluidising Bed Techniques

   Författare :Lars Nilsson; Industriell Produktion; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aluminium oxide; alumina; chemical vapour deposition; eddy current losses; FBR; iron; fluidising bed reactor; powder; SiO2; SMC; TiO2; Al2O3; soft ma etic com sites; CVD;

   Sammanfattning : Today's electrical energy conversion devices, such as motors, transformers, inductors and generators, are based on laminated magnetic cores for reduction of eddy current losses, imposing a two-dimensional magnetic flux distribution. Using a three-dimensional magnetic flux distribution while maintaining low magnetic losses requires new approaches to magnetic core materials. LÄS MER