Sökning: "Thermal decomposition"

Visar resultat 36 - 40 av 134 avhandlingar innehållade orden Thermal decomposition.

1. 36. Epitaxial Growth and Design of Nanowires and Complex Nanostructures

   Författare :Kimberly Dick Thelander; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Natural science; III-V Semiconductor Materials; Fysik; Kondenserade materiens egenskaper:struktur; phase equilibria; crystallography; thermal and mechanical properties; Condensed matter:stucture; egenskaper termiska och mekaniska ; kristallografi; fasjämvikt; Naturvetenskap; Physics; Nanowires; Vapour Phase Epitaxy; Semiconductory physics; Halvledarfysik;

   Sammanfattning : This thesis describes the epitaxial growth of III-V semiconductor nanowires using Au seed particles, and the design of more complex three-dimensional branched structures from these wires. Growth was performed by metallorganic vapour phase epitaxy, in which precursor molecules for the semiconductor material components are introduced in a low-pressure vapour. LÄS MER

3. 37. Development of fine-mesh methodologies for coupled calculations in Light Water Reactors

   Författare :Klas Jareteg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CFD; Coupled neutronics thermal-hydraulics; nuclear reactor multiphysics; multiphase flow;

   Sammanfattning : This thesis presents fine-mesh multiphysics methodologies and algorithms for numerical predictions of the behavior of Light Water Reactor (LWR) cores. The multiphysics aspects cover the distribution of neutrons, the fluid flow of the coolant and the conjugate heat transfer between the solid fuel pins and the fluid coolant. LÄS MER

4. 38. Alkoxide complexes of rhenium, niobium and tantalum

   Författare :Olesya Nikonova; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis describes two major methods for preparation of new mono-, bi- and trimetallic complexes on the basis of Rhenium, Niobium and Tantalum: (1) - the electrochemical method for the synthesis of Re4O4(OEt)12 and (2) - the interaction of Rhenium heptoxide, Re2O7, with alkoxo-derivates of Niobium and/or Tantalum, M2(OR)10 for the synthesis of bi- and trimetallic complexes of common formula (M1-xM'x)4O2(OR)14(ReO4)2 (M = Nb; M' = Ta; R = Me, Et), where x = 0–1. The structures of these complexes were determined by single-crystal X-ray diffraction. LÄS MER

5. 39. Ab initio modelling of alkali-ion battery electrolyte properties

   Författare :Erlendur Jonsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Batteries; sodium salts; lithium salts; ab initio; DFT; electrolytes; anions;

   Sammanfattning : Lithium-ion batteries are omnipresent in modern electronics. They can be found in laptops, mobile phones and electric vehicles. LÄS MER

7. 40. Super duplex stainless steels : Microstructure and propertiesof physically simulated base and weld metal

   Författare :Vahid Hosseini; Leif Karlsson; Högskolan Väst; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Super duplex stainless steel; weld metal; physical simulation; phase balance; precipitation; secondary phases; corrosion; nitrogen loss; arc heat treatment; production technology; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

   Sammanfattning : High-temperature processing and application of super duplex stainless steel(SDSS) are associated with the risk of changes in the ferrite/austenite balance and precipitation of secondary phases. This study was therefore aimed at improving knowledge about effects of thermal cycles on the microstructure and properties of SDSS base and weld metal. LÄS MER