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.
Results
Showing 1 to 20 of 22 for “"gradient effects"”.
-
Fluoride varnish concentration gradient effects measured by quantitative light fluorescence
… 1) to measure the fluoride concentration gradient in 10-ml tubes of fluoride varnish, based on the resting position of the tube prior to use; 2 ) to compare a varnish 's concentration gradient to its ability to inhibit caries in an artificial caries environment; 3) to compare and contrast …
-
Pressure Gradient Effects in the Viscous Wall Region of a Turbulent Flow
The results of a study investigating the effects of an imposed pressure gradient on the viscous wall region of a turbulent flow are presented. Only imposed pressure gradients homogeneous in the streamwise direction are considered.
-
Combined irregular roughness and favorable-pressure-gradient effects in a turbulent boundary layer
… roughness and moderate favorable-pressure-gradient (FPG) conditions on the structure of a turbulent boundary layer was assessed using two-dimensional particle image velocimetry (PIV) measurements in the streamwise{ wall-normal plane and stereo PIV measurements in the wall-normal{spanwise …
-
Equivalence Ratio Gradient Effects on Local Flame Front Topology and Heat Release Rate in Stratified, Iso-Octane/Air Turbulent V-Flames
Effects of partial premixing on the local behaviour of turbulent flames were investigated using a novel rectangular slot burner that could generate controlled, transverse variations in mixture strength along its exit plane. Turbulent, iso-octane/air V-flames were anchored in reactant mixtures of …
-
In situ High Pressure and Temperature 13C NMR for the Study of Carbonation Reactions of CO2
… a 1D pH imaging method is employed to observe pH gradient effects across mineral samples during their reaction with CO2. Finally, other experimental details are discussed including ex situ analysis on carbonate products using pXRD, Raman, and MAS NMR. Detailed discussion outlines how to use 13C …
-
A numerical study of the forcing mechanisms of the Leeuwin current system
… wind forcing, bottom topography and thermohaline gradients in the Leeuwin Current System (LCS), several experiments are conducted with a sigma coordinate primitive equation model on a beta-plane. Results show that the LCS is an anomalous eastern boundary current (EBC) that generates a coastal …
-
Indentation of plastically graded materials
The introduction of certain controlled gradients in plastic properties is known to promote resistance to the onset of damage at contact surfaces during some tribological applications. Gradients in composition, microstructure and plastic properties can also be deleterious to contact-damage …
-
Sliding contact at plastically graded surfaces and applications to surface design
… structural components and industrial tools. The gradient in plastic properties is of greater significance for such tribological applications due to the higher level of plastic strains. However, no systematic study exists to predict the impact of plastic gradients for such abrasive events. Such a …
-
Wall-modeled Large-eddy Simulation Based on Building-block Flows
… model is constructed to predict zero-pressure-gradient wall-bounded turbulence, adverse/ favorable pressure gradient effects, separation and laminar flow. The approach is implemented using a Bayesian classifier, which identifies the contribution of each building block in the flow, and a …
-
Near-wall similarity in two- and three-dimensional turbulent boundary layers
… range of two-dimensional, (near-zero) pressure gradient flows. Static pressure, mean velocity, and direct wall shear measurements using the omnidirectional meter were completed in a pressure driven, and two different shear driven three-dimensional flows. These data were combined to evaluate ten …
-
Length-Scale Effects on Nano-Scale Materials Behavior
… sizes below 20 nm. (2) Texture and anelastic effects cannot explain the elastic behavior at the nano-scale and we propose a mechanism based atomic-scale interactions. (3) In-situ TEM tests show that below a transitional length-scale (50 nm grain size for aluminum), dislocations cease to exist …
-
Strain gradient plasticity-based modeling of damage and fracture
… that metallic materials display strong size effects at the micron scale, with smaller being harder. As a result, a significant body of research has been devoted to model this size dependent plastic phenomena. At the continuum level, phenomenological strain gradient plasticity (SGP) …
-
IMPLEMENTATION AND PERFORMANCE OF WALL MODELS FOR LARGE EDDY SIMULATION OF NON-EQUILIBRIUM TURBULENT BOUNDARY LAYERS
… most practical flows exhibit nonequilibrium effects such as pressure gradient, flow separation, and mean three-dimensionality. However, the direct numerical simulation (DNS) of high-Reynolds-number wall-bounded turbulent flows is not feasible owing to the prohibitive computational cost of …
-
Effect of boundaries on swimming of Paramecium multimicronucleatum
… locomotion of ciliates. First, we explore the effects of boundaries on swimming modes of Paramecium multimicronu- cleatum by introducing them in 2D films and 1D channels. The geometric confinements cause the Paramecia to transition between: a directed, a meandering and a self-bending behaviors. …
-
The Effects of Curvature on Turbulent Boundary Layers Over a 3D Bump Geometry: An Experimental Study Using BeVERLI Hill
… presents an experimental investigation of the effects of curvature on turbulent boundary layers using the Benchmark Validation Experiment for RANS and LES Investigations (BEVERLI) Hill setup. The study focuses on analyzing the flow behavior over a three-dimensional bump geometry that …
-
The effect of moisture gradients on the stiffness and strength of yellow-poplar
… a non-uniform moisture distribution. Moisture gradients are likely to develop in full-size members tested in the In-Grade Testing Program and might therefore affect the test results. The purpose of this study was to mathematically model the effect of desorption moisture gradients on the …
-
Modelling and simulation of drying process for ceramic membrane fabrication
… the high sensitivity of ceramic to any thermal gradient effects. Therefore, processing steps of green body of ceramic is crucial especially in membrane fabrication that has a multilayer structure to ensure the efficiency of its applications. Thus, every step of ceramic membrane preparation and …
-
Performance enhancement strategies for design and test Optimization of analog and mixed-signal circuits
… ensure the minimization of errors due to process gradients, stress and process gradients must also be considered. In this dissertation, an algorithm is presented to generate layout patterns to minimize any variant of gradient effects on a pair of analog components and ensure good matching.
-
The production and perception of domain-initial strengthening in Seoul, Busan, and Ulsan Korean
… stop voicing and denasalisation, and the kind of gradient effects widely reported for DIS, there has been no explicit investigation of the links among them. Thus, I examined the hypothesis that DIS, operating in the phonetic component, has given rise to the categorical rules of lenis stop voicing …
Page 1 of 2