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 15 of 15 for “"Chemistry and structure"”.
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The Effects of Iron Oxidation State on Surface Chemistry and Structure of Iron-Bearing Smectites: Cation Fixation and Selectivity, Structural Iron Environment, and Dissolution
… are widespread as a major constituent of soils and sediments and include a substantial amount of structural Fe. The reduction of structural Fe(III) invokes partial dehydroxylation, protonation, and site translocation of Fe(II) to alter the crystal structure. The structural changes, therefore, …
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Structure-based approaches applied to the study of pharmaceutical relevant targets
… methods became complementary to traditional and modern drug discovery approaches. Indeed CADD is useful to improve and speed up the detection and the optimization of bioactive molecules. The present study is focused on the application of structure-based approaches to the study of …
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A Nano-Scale Chemical and Structural Characterization of Chinook Salmon (Oncorhynchus tshawytscha) Otoliths Using a FIB and HRTEM
… to create thin sections from the post-hatch and core regions of Chinook salmon (Oncorhynchus tshawytscha) otoliths. The nano-scale chemistry and structure of these regions was characterized in thin section using scanning electron microscopy (SEM) in conjunction with cathodoluminescence (CL) …
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Natural and engineered surfaces for enhanced phase change heat transfer
… ubiquitous process that occurs throughout nature and in a wide range of engineering systems. Over the last century, many researchers have studied the effect of surface wettability on the enhancement of phase change heat transfer. Interestingly, interfacial phenomena tailored for the manipulation …
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Single-component Li₂O solid electrolyte interphase on lithium : probing transport properties in battery environments
… (SEI), which impedes smooth Li plating and leads to dendrite growth. In spite of much attention paid to engineering Li interfaces of late, there is still limited understanding of the desired chemical composition of an improved Li SEI. One major challenge has been a lack of empirical data …
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Long-term n fertilization affects soil bacterial communities in agronomic fields
… communities influence plant productivity, chemistry and structure of soil and nutrient cycling. In turn, long-term nitrogen fertilization changes soil physical and chemical properties and thus influences soil microbiomes. In-depth understanding of the long-term nitrogen fertilization …
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Rhizophoraceae alkaloids : an approach to the synthesis of cassipourine
The chemistry and structure of cassipourine are outlined, and a number of various possible synthetic approaches are discussed in the light of the chemistry of 1,2-dithiols and of the pyrrolizidine ring system. A route commencing with L-proline having been chosen, this was converted into …
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Understanding the effect of protonation on the self-assembly of a model polyelectrolyte-neutral block copolymer
… fuel cell membranes, heat sealing packages, and golf ball covers. Traditionally made as random copolymers of charged and uncharged monomers, morphological understanding and control is limited due to the lack of long range order and small length scale of the structural inhomogeneities. …
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Chemical Controls on the Formation of Amorphous and Crystalline Calcium Phosphates
… of amorphous calcium phosphate (ACP) and brushite into hydroxylapatite, an important biomineral, has been documented. The relationships between synthesis conditions and the formation and transformation of these phases are not comprehensively understood. The metastable nature of ACP has …
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On the Influence of Gamma-Irradiation Sterilisation and Ageing on the Fracture Properties of Ultra High Molecular Weight Polyethylene
Pitting and delamination wear of ultra high molecular weight polyethylene (UHMW-PE) tibial plateaux for total joint replacements have habitually been attributed to a fatigue crack growth mechanism associated with a combination of high sub-surface cyclic shear stresses and degradation of the …
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STUDENTS’ UNDERSTANDINGS OF ACID-BASE REACTIONS INVESTIGATED THROUGH THEIR CLASSIFICATION SCHEMES AND THE ACID-BASE REACTIONS CONCEPT INVENTORY
… are an important part of the curriculum in many chemistry courses. Students’ knowledge about acid-base reactions is dependent on their ability to transfer knowledge from multiple topics such as solutions, reaction chemistry, and structure/property relationships, making it a ripe area for …
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Graphene-based Hybrid Electrodes for High-Performance Supercapacitors
… capacitors. The interface between the electrodes and electrolytes is crucial in advancing supercapacitor performance, as this solid electrolyte interface (SEI) is where charge storage occurs, and the electrochemical reactions occur. Hence, controlling the chemistry and structure of the electrodes …
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Structure-property correlations in compositionally complex ferroelectrics
… can significantly alter material properties and lead to the emergence of unconventional behavior. Ferroelectrics with switchable polar ordering, for instance, are influenced by local compositional variation, thus requiring an understanding of structure-property relationships. My dissertation …
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Interactive Association Between Molecular Structure Spectral Profiles and Nutrient Utilization and Availability of Leaf, Stem, Pods, and Whole Plant Faba Bean Forage in Ruminants Before and After Rumen Incubation
… were to: (1) compare structural, physiochemical, and nutritional characterization among faba bean samples (stem, leaf, whole pods, whole plant and whole plant silage) and (2) use different parts of faba bean, whole plant faba bean and whole plant faba bean silage as references to study the effect …
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Single-crystal elasticity of Al-rich phases in the Earth’s transition zone and lower mantle
Understanding the Earth’s internal convection process is one of the major frontiers in Earth sciences. The subduction of oceanic lithosphere must produce chemical heterogeneities in the mantle, which may explain some instances of lateral heterogeneity in seismic wave velocities. Seismic …