Essays about: "oxygen defects"

Showing result 1 - 5 of 16 essays containing the words oxygen defects.

  1. 1. C/O+ charge transfer & the Olson-Demkov model

    University essay from Uppsala universitet/Teoretisk astrofysik

    Author : Kristoffer Bengtsson; [2021]
    Keywords : Astronomy; Charge transfer; rate coefficient; Carbon; Oxygen; energy defect; spectral modelling; supernovae;

    Abstract : Charge transfer reactions and their rates play a key role in correctly estimating element abundances in astrophysical objects such as supernovae. The reaction $C + O^+ \rightarrow C^+ + O(^1D) + \Delta E$ has been shown to be of significance when estimating oxygen abundances through model spectrum evaluations, and the relative rate of this reaction can under certain circumstances completely dictate the neutralization rate of oxygen ions. READ MORE

  3. 2. Influence of strain and point defects on the Seebeck coefficient of thermoelectric CoSb3 : Inverkan av töjnings och punktdefekter på Seebeck-koefficienten för termoelektrisk CoSb3

    University essay from Malmö universitet/Fakulteten för teknik och samhälle (TS)

    Author : Ibrahim Awala; [2021]
    Keywords : Cobalt antimonide; Thermoelectric; Strain; Seebeck coefficient; oxidation; DFT; DFT-MD;

    Abstract : Many studies and experiments have been conducted over the years to find solutions to the electricity problem. This issue is not just related to how fossil fuels are dispensed. Also, the environmental concerns associated with using fossil fuels have become a severe issue, which is a major cause of environmental pollution and ozone layer damage. READ MORE

  4. 3. Electrolytic Extraction of Aluminium Bifilms

    University essay from KTH/Materialvetenskap

    Author : Simon Bergfors; Davida Flink; [2020]
    Keywords : Aluminium; Bifilms; Oxide films; Electrolytic extraction; Scanning electron microscope; Aluminium; Oxidfilm; Elektrolytisk extraktion; Svepelektronmikroskop;

    Abstract : Bifilms is the oxide layer created between two surfaces in the melt of light metals that form an oxide layer. These become planar inclusions in the final casting and are problematic for the mechanical properties such as cracks and crack initiations. READ MORE

  5. 4. Researching and Developing Universal Gas Purging Solutions

    University essay from KTH/Maskinkonstruktion (Avd.)

    Author : Ludvig Briheim; Dennis Ståhl; [2020]
    Keywords : Gas Purging Plug; Pipe Purging; Root Shielding; Shielding Gas; Pipe Welding; Rotgasplugg; Rotgasskydd; Skyddsgas; Rörsvetsning; Rörrengöring;

    Abstract : In the welding of more sensitive metals such as stainless steel, titanium and some specific nickel alloys, the presence and application of a protective gas is essential. Without the use of a nonreactive shielding gas, defects occur in or adjacent to the weld joint, which vary from light discoloration of the weld bead to the direct onset and propagation of cracks. READ MORE

  6. 5. Development of method for processing brittle-hard materials using Laser Metal Deposition (LMD)

    University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Author : Alejandro Simó Vesperinas; [2018]
    Keywords : Additive Manufacturing AM ; Laser Metal Deposition LMD ; Direct Metal Deposition DMD ; High-temperature materials; Mo-Si-B alloy; Residual stress; Cracks;

    Abstract : New materials capable of operating at ultra-high temperatures in gas turbine engines are highly desired. Materials such as silicides of refractory metals present great potential to substitute single crystal nickel-based superalloys. READ MORE