Essays about: "energy defect"

Showing result 16 - 20 of 29 essays containing the words energy defect.

  1. 16. Residual stresses in Ti-6Al-4V from low energy laser repair welding

    University essay from KTH/Maskinkonstruktion (Inst.)

    Author : Peter Ericson; [2018]
    Keywords : Micro laser welding; Low energy welding; Ti-6Al-4V; Ti64; Residual stress; Response Surface Methodology; Repair welding; Welding simulation; Mikrolasersvetsning; Lågenergetisk svetsning; Lågenergisvets; Ti-6Al-4V; Ti64; Restspänningar; Response Surface Methodology; Reparationssvets; Svetssimulering;

    Abstract : Millimeterstora och svårupptäckta defekter kan uppstå internt i stora och komplexa gjutgods av Ti-6Al-4V, ibland går dessa oupptäckta tills detaljen genomgått mekanisk bearbetning och en stor kostnad redan har gått in i den. Dessa defekter och andra industriella olyckshändelser leder till ett behov av additiva reparationsmetoder där den för tillfället rådande metoden är TIG-svetsning. READ MORE

  3. 17. Monte Carlo simulation of the spatial response function of a SPECT measurement device for nuclear fuel bundles

    University essay from Stockholms universitet/Fysikum

    Author : Emilie Dul; [2017]
    Keywords : Monte Carlo MCNPX Safeguards;

    Abstract : The PGET device is currently being developed for partial-defect verication purposes on nuclear fuel assemblies. It Comprises CdTe detector elements in a heavy tungsten-alloy collimator, for which collimator slit openings define the field-of-view. READ MORE

  4. 18. Optical spectroscopy of impurity atoms in semiconducting Nanowires

    University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Author : Shishir Shroff; [2017]
    Keywords : Photoluminescence; Nanowire; Defects; Diffusion; GaAs; Copper; Physics and Astronomy;

    Abstract : In a small and confined one dimensional geometry of nanowire, even few defects can influence the performance of the devices. Main objective of this thesis is to conduct photoluminescence study of such defect states in GaAs nanowires, which we will first introduce by diffusing copper impurity atoms, in very low concentrations. READ MORE

  5. 19. Chemical Vapor Deposition Growth and Density Functional Theory Calculations of Trilayer Graphene

    University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Author : Mohamed Atwa; [2016]
    Keywords : ;

    Abstract : Density functional theory was employed to investigate the energetics of ABA, ABC, and intermediary stacked phases for both pristine and s-triazine functionalized graphene trilayers. The energy of the ABC-stacked phase relative to the pristine ABA-stacked ground state showed a 94% increase when s-triazine was adsorbed to the graphene surface, confirming previous studies of the ability of s-triazine to facilitate the ABC to ABA phase-transition. READ MORE

  6. 20. Small Polarons In Cadmium Sulphide : A First Principles Study

    University essay from Uppsala universitet/Materialteori

    Author : August Wollter; [2016]
    Keywords : ;

    Abstract : A small polaron is a localized state in a material where a charge induces a potential well by perturbing adjacent ions from equilibrium, and getting trapped. A search for small hole polaron states in defect free cadmium sulphide is attempted using iterative density functional theory calculations, with the hybrid functional HSE06. READ MORE