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 20 of 50 for “"depth-profile"”.
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Concentration depth-profile reconstruction from angle-resolved XPS data using the maximum entropy method: characterization of surface film formed on Ni-18P alloy
A knowledge of the depth concentration profile of materials is very important for research and technological development. Methods reported in the literature are often destructive and/or based on severe approximations; their application is limited to relatively simple profiles (number of components …
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Depth Profiling in Thin Films via Waveguide Spectroscopy
A novel optical depth profiling technique is developed to depth profile thin optically transparent films which can be fabricated in the form of an asymmetric slab optical waveguide. Various methods for depth profiling thin dielectric films are also reviewed in a manner which illustrates the utility …
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Toxicity and Contamination in Bear Creek Sediment: Spatial Analysis and Implications for Risk Assessment
… The present study maps the spatial extent and depth profile of toxicity and contamination in Bear Creek, and explores correlations between heavy metals, organic contaminants, and toxic responses. Two novel analytical techniques – handheld XRF and an antibody-based PAH biosensor – were applied …
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In situ and post mortem surface chemistry measurements of boronization in the national spherical torus experiment upgrade
… substrates. The post mortem work includes XPS depth profile analysis, which shows that boron remains on the surface. Some low-energy ion scattering spectroscopy (LEISS) analysis was also done. Post mortem analysis on graphite tiles removed from NSTX-U is crucial to studying PFC surface …
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Characterization of Iron-Chromium-Aluminum surface coated Zircaloy-2 under high temperature steam
… under 700_C steam exposure was quantified by AES depth profile. Zirconia formation was inhibited by the FeCrAl coating. A thicker film proved to be more protective, and delayed zirconia formation for a longer time. In 1100C steam environment, a complete film loss was observed due to the low …
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Core-Level Photoemission Studies of the Structure of Semiconductor Surfaces and Interfaces
To determine to the chemical depth profile of the Si(111)/SiO2 interface, the photoemission intensity of the Si 2p core level from the Si(111)/SiO2 system has been measured as a function of photoelectron emission angle. The SiO2 layer is amorphous, and photoelectron diffraction techniques cannot be …
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Wintertime nitrate isotope dynamics in the Atlantic sector of the Southern Ocean
… for the region south of Africa. Water column profile and underway surface samples collected in July 2012 span a range of latitudes from the subtropics to 57.8°S, just beyond the Antarctic winter sea-ice edge (56.7°S). The data are used in the context of simple models of nitrate consumption …
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Using emergent self-organizing maps to identify marine group II archaea genomic fragments from uncharacterized microbial metagenomic sequences
… these clusters in the Hawaii Ocean Time Series depth profile fosmid libraries in the DeLong lab were mapped onto depth profiles from three independent cruises.
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Laser induced emission spectrometry for rapid elemental analysis.
… survey analysis of polymeric materials and the depth profiling of coated steels. A survey analysis of polymeric materials for twelve elements (Al, Ba, Ca, Cu, Fe, Mg, Pb, P, Sb, Sn, Ti and Zn) is reported. Results showed that element emission responses are dependent upon operating conditions, …
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Migration of an intruder particle in a boundary driven shear flow
… properties of this flow are characterized by the depth profile of granular temperature, mean velocity and granular pressure which are related to the wall roughness, shear gap height and particle inelasticity measured by a constant normal restitution coefficient. By means of autocorrelation and …
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Large-scale molecular dynamics investigations of ion-induced compositional dynamics leading to nanopattern formation at semiconductor surfaces
… diametrically-opposed surface compositional profiles. This knowledge chasm between experiments and theories requires a fundamental understanding of the ion-induced mechanisms that can lead to surface instabilities, to eliminate the dependence on simplifying assumptions and tunable parameters …
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Bonding mechanisms in the application of thermal barrier coatings to turbine blades.
… atomic emission technique used for both bulk and depth profile analysis, which had not previously been applied to TBC's, and SEM and TEM in order to enhance understanding of failure modes in TBC systems and adhesion process. The results obtained from the studies indicate that the GDOES technique …
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Characterizing Groundwater Discharge from a Cobble Armored Streambed, Alder Creek, Ontario, Canada
… to seepage velocities estimated from temperature-depth profiles (10-50 cm below the streambed surface). When compared, the SBPVP results were found to be 2 orders of magnitude larger than the temperature-depth profile values. This observed difference was attributed to a combination of factors, …
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Deciphering the role of surface composition and topography in self-organized ion-induced nanopatterning of multicomponent semiconductors with in-situ and in-operando metrology
… the importance of understanding the information depth of the techniques used with surfaces that have a non-uniform depth profile. The combined in-operando XPS and LEISS studies done in this dissertation show that just before ion-induced nanopatterning formation, the very surface is highly …
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Childcare Tutors: Profiles, Perspectives and Professional Development Needs
… practitioners. This study presents an in-depth profile of a small number of such childcare tutors and maps their working contexts. Original data regarding the provision of childcare training nationally were compiled from a range of sources. Data from semi-structured interviews with …
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Multienergetic External-beam PIXE as a Means of Stydying the Surface Enrichment Effect in Coins
… to different levels and were able to produce a depth profile of the elemental composition of the sample. In this study, the sample set we chose to examine consisted of ancient and modern coins. This paper first describes the surface enrichment effect and theoretically how PIXE can be used to …
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Ridge waves
… of the ridges are fit by a double-exponential depth profile and the linearized shallow water equations are solved with the simplified topography. In the northern hemisphere the western ridge flank supports an infinite set of modes for a topographically trapped northward propagating wave and the …
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Dating of alluvial fans from NW Argentina using cosmogenic nuclides and optically stimulated luminescence technique
… luminescence (OSL/IRSL) dating and one depth profile for cosmogenic radionuclide dating (10Be) were collected in the Santa Maria Valley in NW Argentina, where the exceptional preservation of several generations of alluvial fans allow exploring the external forcing conditions that led to …
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The biogeochemistry of cobalt in the Sargasso Sea
… stability constant of logK=16.3l0.9. A depth profile of Co at BATS revealed a nutrient-like profile. Biweekly time series measurements of total cobalt near Bermuda from the MITESS sampler were 0-47pM throughout 1999, and averaged 20±10pM in 1999. A transect of total cobalt from BATS to …
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Research and development of CuInSe[2]-based photovoltaic solar cells.
… surface analysis was performed using XPS and the depth profile analysis was studied by GDOES. The optical properties were characterised by optical absorption and the conductivity type was determined by PEC measurements. The conditions of electrodeposition and post deposition treatments were found …
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