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 608 for “"Volume Fraction"”.
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Mechanics of periodic elastomeric structures with varying void volume fraction and thin-film coating
… materials in two and three dimensions when void volume fraction is varied and a thin-film coating is incorporated. Computer modeling was used to predict and understand the mechanics of the transformation behavior; results showed that three-dimensional specimens behaved like their 2D counterparts …
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Microplastic deformation of polycrystalline silver chloride containing a small volume fraction of hard inclusions
… with 500 ppm copper chloride (CuC1) and 0.01 volume percent of 1 to 5 micron glass spheres and particles. After rolling, recrystallizing and tensile testing, composite samples are exposed to UV light. This "decorates" dislocations in the top 40 microns of a sample with metallic silver so they …
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Effect of volume fraction of solids on the compressive stress-strain behavior of collagen-glycosaminoglycan scaffolds
This thesis aims to examine the effect of volume fraction of solids in collagen-glycosaminoglycan (GAG) scaffolds on the compressive-strain behavior of the structure and compare these results to the open-cell foam model. Collagen-GAG (CG) scaffolds have been used for regenerating skin, conjunctiva, …
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Laser Induced Incandescence for Volume Fraction and Relative Particle Size Measurements in a Rich-Quench-Lean Jet A Combustor
… this thesis focuses on the measurement of soot volume fraction and relative soot particle size distribution using laser-induced incandescence (LII) diagnostics inside a three-sector rich-quench-lean (RQL) aeroengine combustor running with Jet A fuel. First, the setup is described including …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
<p>A fundamental understanding of advanced compression ignition combustion is requisite to meet the simultaneous challenges of stringent fuel efficiency and emission standards. Single zone simulation shows that nitrogen oxide (NOx) production occurs in a high temperature region and soot production …
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Design and testing of an experiment to measure self-filtration in particulate suspensions
… measuring self-filtration in terms of change in volume fraction downstream of a constriction compared to volume fraction upstream of said constriction was designed and tested. The user has the ability to control a variety of parameters including constriction geometry, flow rate, and initial …
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Regression Analysis of Fracture Toughness for Secondary Osteons Located in Human Cortical Bone
… of usable parameters included: region, porosity, volume fraction of lightfield osteons, volume fraction of hooped osteons, volume fraction of dark osteons, volume fraction of alternating osteons, volume fraction total, density, average diameter total, average diameter of hooped osteons, average …
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Elucidating Dual Methylcellulose-and-Oil-Nanoemulsion Thermoresponsive Gelation
… distinct dominant load-bearing components. Oil volume fraction determines which component leads to elasticity in the gel network. At low oil volume fraction, methylcellulose forms a fibrillar gel upon an increase in temperature. As oil volume fraction increases, methylcellulose is sequestered …
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The effects of concentration, interaction, size distribution and shape anisotropy on rheology of colloidal mixtures
… Particular interest is focused on the role of volume fraction and strength of interactions that lead to glass or gel formation. Variables studied include particle concentration, strength of attraction, particle size distribution, and particle shape, which have effects on dynamic arrest …
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Effective Young's Modulus of rigid particles in Gelatin composites
… effective Young's Modulus of material and volume fraction of rigid particles. The deformable material used in this study is gelatin, a readily available consumer product. It was found that the higher the volume fraction, the higher the Young's Modulus value for the composite material. In …
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Simulation of concentrated non-Brownian frictional and adhesive suspensions in linear and nonlinear flows
… varying both the intensity of adhesion and the volume fraction: after presenting the difficulties of simulating adhesive suspensions at low volume fractions due to particle depletion at the wall and shear-banding, we show that the relative viscosity of the suspension is a function of both volume …
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Electrostatic, electrokinetic, and ordering properties of concentrated suspensions of polystyrene latex
… properties and interaction potentials with volume fraction are examined with a model that indicates surface properties change little with volume fraction at moderate surface potentials and when the average particle separation is not too small. Further tests of how surface properties change …
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Experimental and theoretical investigation of the curing process of thermosetting composite structures with angle-bend
… degree of cure, viscosity, compaction and fiber volume fraction were examined. A first set of experiments was done to investigate the effect of different curing cycles on temperature exotherms, thickness variation and fiber volume fraction distribution. Results from both simulation and experiment …
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Flexural behavior of a glass fiber reinforced wood fiber composite
… fiber matrix, and the tensile MOE and effective volume fraction of the glass fiber reinforcement. Under the same assumption, the composite modulus of rupture (MOR) is a function of the reinforcement tensile MOE and effective volume fraction, and the matrix stress at failure. The composite MOR was …
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The effects of particle shape, size, and interaction on colloidal glasses and gels
… shape is found to increase the glass transition volume fraction (phi_g) in good agreement with activated naïve Mode Coupling Theory (nMCT) calculations. Differences in fg and the linear elastic modulus (G_0’) due to particle shape can be understood in terms of the Random Close Packed volume …
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Nanophase separation in monodisperse rodcoil diblock polymers
… annealing and show a dependence on the relative volume fraction of segments. A series of polymers varying in rod volume fraction show long, continuous strip-like rod domains aligned in parallel and periodically separated by coils at the largest rod volume fraction studied, discrete aggregates of …
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Phase Behavior, Structure, and Properties of Colloidal Microsphere-Nanoparticle Mixtures
… gel whose strength increased with microsphere volume fraction. Between a lower and upper critical nanoparticle volume fraction, such binary mixtures formed a stable fluid phase due to nanoparticle haloing. In this concentration regime, colloidal microsphere crystals could be assembled under …
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High solid loading aqueous base metal/ceramic feedstock for injection molding
Increasing volume fraction of metal powder in feedstock provided lower shrinkage. Reduction of the shrinkage results in better dimensional precision. The rheology of the feedstock material plays an important role to allowing larger volume fractions of the metal powder to be incorporated in the …
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Biphasic Nanoparticle Inks for Direct Write Assembly of Three-Dimensional Periodic Structures
… suspension either by varying their total volume fraction or ratio of attractive-to-repulsive species. The rheological properties of these biphasic mixtures were measured through shear viscometry, oscillatory shear rheology, and compressive rheology. Biphasic mixtures have shear elastic …
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Polymers, Nanoparticles and Phospholipids
… one another and do not fuse. Subsequently, the volume fraction can be raised as high as ∼50%, reversibly, still without fusion. In studies of liposome longevity, we verify the stability of particle-stabilized liposome suspensions with volume fraction up to 16% for up to 50 days, the longest …
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