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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 36 for “"mineral phase"”.
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Heterogeneous Distribution and Corresponding Mechanical Significance of The Mineral Phase in Fish Scales
… This collagen-based composite is often partially mineralized (primarily hydroxyapatite) in the scale exterior in order to resist penetration and hence to enhance protection. Together with the overlapping assembly, the fish scales offer an excellent model system for developing fiber composite …
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The variation of sinter strength in the sinter bed due to the mineral phase distribution
Please read the abstract in the section 00front of this document
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Multi-scale Assessment of Bone Mechanics and the Mineral Phase of Intramuscular Bone of Atlantic Herring Fish
… composite structure made up of a soft organic phase consisting of collagen I and non-collagenous proteins, and a hard inorganic phase consisting of mineral nanoplatelets. Given it’s compositional properties, bone is a unique stiff, tough, and strong biomaterial, making it exceptionally …
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Stable carbon isotopes in deep time : the diets of fossil fauna and hominids
… tracing millions of years in time,. using the mineral phase of calcified tissues (apatite) as alternative sample material to collagen. The results reported here provide empirical evidence for the validity of the technique. Investigation of the isotopic relationships between diet, collagen and …
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A Solid State NMR Investigation of Poly (ADP-ribose) and Its Involvement in Tissue Calcification
The mechanisms of bone and vasculature biomineralisation are not fully understood. It is unclear how the calcium and phosphate ions are concentrated at the calcification site, and how the composition and structure of the mineral phase changes during maturation. This work aims to use solid state NMR …
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Characterization of Residual Mineral Content of Bauxite Stockpiles in Saline County, Arkansas: An XRD Analysis Approach
… in bauxite stockpiles has focused on critical mineral potential. Previous X-ray Fluorescence studies have identified critical elements in significant concentrations, including uranium (U), thorium (Th), gallium (Ga), molybdenum (Mo), and lanthanides (Ln). This study examines five stockpiles …
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Biochemical approaches to investigate biomineralization of magnesium calcite and aragonite
Biominerals are composites containing a very low percentage of organic matrix amidst a dense mineral phase. Despite having low organic contents, these natural materials are superior to most other synthetic composite ceramics in mechanical strength and toughness. Since biominerals are synthesized at …
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Fine scale imaging of structures at and near the mantle transition zone using a generalized Radon transform
… e.g. the '410' and '660', result from mineral phase changes that occur at depths constrained by temperature and chemistry, and can provide information about the conditions of the mantle within the transition zone. Previous global studies of topography on the transition zone …
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Arsenic mobilization through bioreduction of iron oxide nanoparticles
… remains associated with Fe(III) (hydr)oxide phases. However, under anaerobic conditions Fe(III)-reducing microorganisms can couple the reduction of solid phase Fe(III) (hydr)oxides with the oxidation of organic carbon. When ferric iron is reduced to ferrous iron, arsenic is mobilized into …
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Imaging Resolution of the 410-km and 660-km Discontinuities
… on mantle convection as the associated mineral phase transformations in the transition zone are sensitive to thermal perturbations. Teleseismic P-to-S receiver functions have been widely used to map the depths of the two discontinuities. In this study, we investigate the resolution of …
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Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets
H2O and CO2 concentrations of the glass phase in melt inclusions (MI) are commonly used both as a barometer and to track magma degassing behavior during ascent due to the strong pressure dependence of H2O and CO2 solubilities in silicate melts. A requirement for this method to be valid is that the …
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An investigation of the hydrothermal stability and mineralisation of collagen and their relationship
Mineralised collagen displays an improved hydrothermal stability compared to collagen that is unmineralised. The possibility of using in-vitro partial mineralisation of collagen as a method of increasing the hydrothermal stability was investigated. Remineralisation experiments using demineralised …
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Differentiation in impact melt sheets as a mechanism to produce evolved magmas on Mars
… and employed the MELTS algorithm to model mineral phase equilibria in those impact-generated melts. Model runs consider a range of possible oxidation states (IW to QFM), crystallization regimes (batch, fractional and liquid segregation), and volatile contents (initially water-saturated and …
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Removal of Organic Micro-Pollutants from Water Using Sewage Sludge Based Composite Adsorbents
… rich in organic materials, metals, and inorganic minerals and could be sustainable resources if utilized properly. The main purpose of this dissertation study was, therefore, to convert these wastes into composite adsorbents, and then use these adsorbents to remove various types of organic …
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Grain size evolution and strain localization in deformed marbles
… where the microstructure is unaffected by second phases, the geologically estimated regional strain rates are successfully reproduced, and when it is applied to samples collected along a transect perpendicular to the thrust contact, the results suggest strain became progressively localized …
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Preparation and characterization of natural hydroxyapatite from tilapia bones and scales for biomedical applications
… is well known as a calcium phosphate mineral phase which is widely used as an implant material. HA derived from natural sources have received considerable interest from researchers due to the presence of trace elements (CO32-, Na+ and Mg2+) beneficial for bone metabolism. Thus, in the …
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The X-discontinuity: Seismic signatures of a heterogeneous upper mantle
… with global discontinuities manifesting from mineral phase transitions and large-scale changes in composition like the core-mantle boundary. Widely distributed previous seismic observations of localised reflectors in the upper mantle have been termed the X-discontinuity (X; 230-350 km depth) …
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Investigation of Ex-Situ Carbon Mineralization Fundamentals andScalability in Wet Supercritical Carbon Dioxide
… an urgent yet technically complex goal. Carbon mineralization, the trapping of carbon dioxide in the mineral phase via reaction with magnesium/calcium-rich silicates to form carbonates, is a promising method to offset carbon emissions. In addition to the reaction with carbon dioxide dissolved in …
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Winning Silver
The search for mineral deposits is a time consuming, risky and very expensive process. Applying new models and methods provides a competitive advantage in the search for mineral deposits because an explorationist can quickly evaluate potential targets and eliminate areas without good potential for …
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Octacalcium Phosphate - Metabolite Composites: model compounds for bone mineral structure
… osteoclastic resorption by dissolution of mineral in the area undergoing remodelling. Bone degenerative diseases occur when the balance between bone resorption and deposition of new bone in the turnover process is altered. Bone is a nanocomposite material composed of a mineral phase …
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