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 22 for “"Aggregate structure"”.
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Investigating Use of Aggregate Density to Develop Design Aggregate Structure for Asphalt Concrete Mixtures
… are various potential causes for the failures, aggregate density within the mix when designed at 80 gyrations was of specific concern to this thesis and was compared to the maximum dry density of the aggregate as measured using ASTM D4253-00. The objective of this research was to determine if …
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Asphalt Mixture Design Concepts to Develop Aggregate Interlock
… it was desired to understand the interaction of aggregates, asphalt, and the voids created during their compaction. In asphalt mixture design, guidance is lacking in the selection of the design aggregate structure and understanding the interaction of that aggregate structure and mixture …
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Charging of aggregate grains in astrophysical environments.
… indicate that cosmic dust is likely to have an aggregate structure. This study examines the charging of aggregate grains in different astrophysical environments. A 3D numerical model employing a self-consistent iterative approach to compute the aggregate charge is introduced. Different size …
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Identification and characterization of aquatic soluble unreactive phosphorus in the hydrosphere with 31-phosphorus Fourier transform nuclear magnetic resonance spectroscopy and high-performance liquid chromatography
… compounds are becoming incorporated into an aggregate structure which forms during the concentration procedure. Possible identities of this aggregate structure were examined using a variety of extraction and degradation methods. Extraction of SUP with ion pairing reagents and hydrophobic …
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Evaluation of viscous effects in crack tip fields in recycled asphalt pavement materials using digital image correlation
… of asphalt, a heterogeneous mixture of hard aggregates (usually rock) with a polymeric binder (also called asphalt), used in paving applications. Specifically we studied the dependence of asphalt fracture response on loading rate, temperature, and recycled content in the binder. Fracture …
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Tau aggregation is heterogeneous across cases of sporadic Alzheimer's disease and is influenced by autophagy pathways in vitro
Tau neurofibrillary tangles or aggregates are a common neuropathological feature found in a number of neurodegenerative conditions, including Alzheimer's disease. Understanding the kinetics of this aggregate build up, how it varies across patients, and how aggregation might be influenced by …
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Influence of Sidechain Structure and Interactions on the Physical Properties of Perfluorinated Ionomers
… was to investigate the influence of sidechain structure and sidechain content on the morphology and physical properties of perfluorosulfonic acid ionomer (PFSA) membranes. One of the primary objectives was to characterize the thermomechanical relaxations for short sidechain PFSAs developed by …
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Laboratory characterization of a highly weathered old alluvium in San Juan, Puerto Rico
… in a special combination of soil mineralogy and structure, with very unusual engineering properties. The soil mineralogy was determined both qualitatively and quantitatively by a series of analytical techniques, consisting of X-ray diffraction, thermal analysis, X-ray fluorescence, and chemical …
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Lights, Camera, Reaction! The Influence of Interfacial Chemistry on Nanoparticle Photoreactivity
… sorption, and aggregation on NP aggregate structure, size, and reactivity improve our understanding of trends that impact nanoparticle reactivity.</p><p>Engineered functionalization of FNPs was shown to impact NP aggregation, ROS generation, and viral affinity. Fullerene cage …
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Inverse design of self-assembling colloids via landscape engineering
… blocks that preferentially form into a target aggregate structure. The methodologies derived within are applicable to a wide class of self-assembly systems, both simulated and experimental, enabling a new frontier in the computer-aided design of self-assembling materials. The first portion of …
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Experimental and Numerical Studies on the Soot Formation of Liquid Fuel Relevant Compounds
… various measured optical cross sections to soot aggregate properties. Compared to previously reported studies, the proposed approach can be applied to a wider range of soot sources by removing the assumption made to scattering regime or moment ratio of aggregate size distribution. The second …
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Aggregation Behavior of Chiral Single-Walled Carbon Nanotubes and their Transport in Landfill Conditions
… the effects of variation in electronic structure on aggregation of chiral single-walled carbon nanotubes (SWNTs) and their transport in landfill conditions. This study involves four key tasks: functionalization of chirally separated SWNTs, aggregation kinetics of covalently and …
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Electrostatically-driven self-assembly of polyelectrolytes and colloidal tetrapods
… reveals the relative stability of different aggregated configurations and the likely pathways taken toward first contact and subsequent rearrangement. Chapter 3 presents a study of the effect of including the low dielectric constant interior of rodlike polyelectrolytes has on their mutual …
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Exciton Dynamics in Organic and Inorganic Nanoscale Materials
… lattice found in nanotubular molecular aggregates. The mechanism of photobrightening in these aggregates is explored through fluorescence measurements and wide angle X-ray scattering to demonstrate that the increase in quantum yield is associated with a change of structure. This leads to …
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A multi-scale toolbox to predict structure and function of polysaccharides aggregates
… explored. Many biological polysaccaharides form aggregates and their structures and properties are very versatile and depend on the aggregate structure and molecular interactions. Natural polysaccahrides can also form hydrogels, a porous network of polymers, that can take up a high percentage of …
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Protein adsorption on nanostructured silica surfaces
… of the interaction of globular proteins with nanostructured silica surfaces. It aims to gain a better understanding of the consequences of a high surface curvature and confinement on the adsorption behavior and morphology of the adsorbed protein. The adsorption behavior of lysozyme and …
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Biochemical and Structural Studies of Amyloid Proteins
… mechanisms of the disease-related protein aggregates, that are present in humans, are only understood partially. I have used and developed biophysical methods to study the structural and biological properties of individual aggregates of Amyloid β peptide and α-Synuclein, proteins whose …
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Nanocrystal/J-aggregate constructs : chemistry, energy transfer, and applications
… of materials, semiconductor nanocrystals and J-aggregates of cyanine dyes, have been developed chiefly due to their potential for interacting with light in interesting and productive ways. At the same time, existing spectroscopy and microscopy tools enable the study of these photonic materials, …
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Characterisation and improvement of the rehydration behaviour of high-protein milk powder
… Our results showed that as the porous structure modified the gas distribution in agglomerated MPI, interstitial air within agglomerates and vacuole air within agglomerates determined the gas release behaviour of agglomerated powder, while the vacuole air in primary powder particle …
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Viscoelastic behavior of water-blown flexible polyurethane foams
… some of their morphological features, the urea aggregate structure in particularly, are altered by adding a small amount of LiCl to the formulation. As discussed within the body of this dissertation, these observed changes in morphology are believed to have a significant effect on the …
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