Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Thermal Spike"”.
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Ion beam mixing of Mo/Al bilayer samples and thermal spike effects
… at the interface was considered in terms of thermal spike induced atomic migration. It was found that the coupling of the chemical effect with spike is significant with regard to mixing of the bilayer samples. Furthermore, in addition to the initial contamination of carbon atoms on the …
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Effects of vacancies and electron temperature on the electron phonon coupling in cubic silicon carbide and their connection to the inelastic thermal spike
… related quantities such as the electrical and thermal conductivities, especially in nuclear and space applications. The importance of the electron-phonon interaction in primary damage production in 3C-SiC is the subject of this research. </p><p>The electron-phonon coupling factor was calculated …
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Computer simulation of high fluence ion beam surface modification processes
… taking into account collisional mixing and thermal spike effects, as well as the thermal spike shape. The ion beam mixing parameter for the thermal spike is derived as being proportional to different powers of the damage parameter, i.e. the damage energy scaled by the cohesive energy of the …
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Swift heavy-ion irradiation of amorphous silicon dioxide, silicon nitride and silicon oxynitrides composite systems: from ion tracks to nanoparticle shaping
… The latter is attributed to the short-lived thermal spike resulting from the higher thermal conductivity associated with a-Si3N4. IR spectroscopy analysis shows a region of high radiation damage region within the ion track core for a-SiO2 and a-Si3N4. (ii) To study the synthesis of metallic …
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Swift heavy-ion irradiation of amorphous silicon dioxide, silicon nitride and silicon oxynitrides composite systems: from ion tracks to nanoparticle shaping
… The latter is attributed to the short-lived thermal spike resulting from the higher thermal conductivity associated with a-Si3N4. IR spectroscopy analysis shows a region of high radiation damage region within the ion track core for a-SiO2 and a-Si3N4. (ii) To study the synthesis of metallic …
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Investigation of thermal effects on fatigue crack closure using multiscale digital image correlation experiments
… investigates, at multiple length scales, the thermal effects on fatigue crack closure of Hastelloy X, a nickel-based superalloy. Using multiscale, digital image correlation (DIC), macroscale experiments were performed at 2x magnification (2 µm/pix), providing full-field crack closure …
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Molecular dynamics studies of the interactions of low energy particles and clusters with surfaces
… insight into the question of ""non-linear"" or thermal spike sputtering and also suggest a mechanism for cluster emission. Cluster-solid interactions were investigated by simulating the impact of various metallic clusters on metal surfaces. The energies of the clusters were varied from less than …
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Radiation-enhanced diffusion of oxygen-18 in uranium dioxide thin films
Anion radiation enhanced diffusion (RED) and thermal diffusion of a buried 18O tracer layer in thin film UO2 was measured using Secondary-Ion Mass Spectroscopy (SIMS). Thin films were grown using a dedicated magnetron sputtering chamber. Samples were irradiated with 1.8 MeV Kr+ over a temperature …
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Aerodynamic Heating of a Hypersonic Naval Projectile Launched At Sea Level
… flight at sea-level conditions induces severe thermal loads not seen by any other type of current hypersonic system. Appropriate design of the hypersonic round requires a solid understanding of the thermal environment. Numerous codes were obtained and assessed for their applicability to the …
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NUCLEATION AND DETECTION IN TENSION METASTABLE FLUIDS
Neutron detection and spectroscopic techniques using state-of-the-art systems is covered. A novel approach using conventional (e.g., LiI, He-3, BF3) detectors coupled with Monte-Carlo code simulations to develop spectroscopy information was developed (in lieu of present-day tedious methods …
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Manufacturing of thermosetting polymers and composites using frontal polymerization: A numerical study
… their excellent specific stiffness and strength, thermal stability and chemical resistance. Yet, the wider use of highperformance thermoset composites is limited by the complexity and cost of the fabrication process, which usually requires the monomer to be cured at high temperatures (around …