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 20 for “"History Effects"”.
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Solution History Effects and Crystal Phase Transformation in Polybutene-1 and Domain Morphology in Polyurethanes
… which precipitates is determined by the thermal history imposed on the solution and the crystal structure of the initial PB-1 solid. It is proposed that on dissolution, the helix conformation originally present in the solid may be temporarily retained. With time, it transforms into the helix …
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Biotic interactions through a macroecological lens: biogeographic trends in parasitism rates and life history effects on the evolution of cooperation
… of nutrients and energy in an ecosystem, their effects on fitness having the ability to shape species' ecology. Biotic interactions are also highly context-dependent, varying in strength in response to many abiotic and biotic factors. Research into biotic interactions can be streamlined by …
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The Resolution and Structure of High Reynolds Number Turbulent Boundary Layers Over Rough and Smooth Walls in Pressure Gradient
… integrated boundary layer parameters. These ``history effects" are also prevalent in mean velocity profiles which are exhibited as a cross-over of the favorable and adverse pressure gradient profiles in the logarithmic layer. Similar cross-over points are observed in the Reynolds shear and …
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Analysis of Unbound Aggregate Layer Deformation Behavior From Full Scale Aircraft Gear Loading With Wander
… profiles were then combined with stress history effects to predict the residual transverse profiles for all test sections. This new permanent deformation model emphasizes the use of the previous load location and stress history of the pavement element to develop the residual deformation …
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Structure and Turbulence of the Three-Dimensional Boundary Layer Flow over a Hill
… the turbulence behavior, including significant history effects at all stations due to the changing pressure gradient impact through the height of the boundary layer. Supplementing the experimental results with analysis from rapid distortion theory and simulations, it is shown that the stations …
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Permanent Deformation Behavior of Airport Flexible Pavement Base and Subbase Courses
… base and subbase layers and the important effects of rotation of principal stress axes were indicated for a proper characterization of the permanent deformation behavior. Triaxial test data were obtained and analyzed from testing aggregates under various realistic in-situ stress paths due …
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The Effects of Pressure Gradient and Roughness on Pressure Fluctuations Beneath High Reynolds Number Boundary Layers
… Averaged-Navier-Stokes (RANS) computations. The effects of pressure gradient, pressure gradient history, roughness, combined roughness and pressure gradient, and combined roughness and pressure gradient history on boundary growth and the behavior of the underlying surface pressure spectrum are …
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Development of in-situ radiometric inspection methods for quality assurance in laser powder bed fusion
… data predicts laser scan path driven thermal history effects for process correction applications”--Abstract, page iv.</p>
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The solitary wave and the forces it imposes on a submerged horizontal circular cylinder: an analytical and experimental study
… namely the drag and inertia components. History effects are removed by using the fluid environment generated by the solitary wave, which is unidirectional accelerated motion in still water. Measurement and validation of the fluid flow characteristics are made, to ensure a high degree of …
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Reassessing the Power of One Reinforcer with an Evaluation of Learning Histories
… response may be due to the acquired learning history of participants. This study sought to replicate the findings of Hunter and Rosales-Ruiz and further evaluate the role of the experimental learning history in the persistence of the non-target behavior. Major findings of the initial study …
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Savanna Restoration Through Prescribed Fire: Demographic and Physiological Responses of Oak and Hickory Seedlings and Saplings to a Changing Light Environment
… sampled to determine indirect links between fire history effects on canopy leaf production and the demography and physiology of seedlings and samplings (Quercus spp., Carya spp., Juniperus spp.). Following prescribed burns, canopy light penetration was significantly greater in burned forest sites …
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The determination of soil parameters for design from stress path tests
… soil structure, threshold and stress history effects, design of the apparatus and test procedure. Elasticity theory for cross-anisotropic soils is reviewed, particularly as it relates to the triaxial apparatus.The way in which elasticity theory is incorporated in the critical state …
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A turbulence model for steady and unsteady boundary layers in strong pressure gradients
… equation. This approach allows for the history effects of the turbulence to be taken into account in an approximate but rational way. The form of the near-wall mixing length model is derived based on the rigorous distribution of the shear stress near the wall, and it takes into account …
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Turbulent boundary layer separation and its driving factors
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Turbulent boundary layers under complex spatial and temporal pressure gradient histories
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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History Induced Critical Scaling in Disordered Media and Super Diffusive Growth in Highly Advective Random Environments
… hysteretic systems, the role of driving force history is studied in the context of the non-equilibrium, zero-temperature Random Field Ising Model (RFIM). The RFIM was originally developed as a simple model for disordered magnets, but has applications far beyond magnetic systems. Previous work …
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Multidisciplinary Approach to Civil Conflict: Political, Economic, and Social Determinants of Violence
… measure in isolation and whether the joined effects produce different results. In addition to exogenous factors, it explores endogenous conflict history effects on the current violence levels. Finally, it tests each civil conflict measure across seven regions to capture a unique geographic …
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Improving Data Quality for High Resolution Functional MRI in Cognitive Neuroscience Applications
… pulse. This allows for the correction of spin-history effects and intra-volume distortions. In this study, I utilized a secondary optical camera in the bore of the scanner to track a Moiré phase marker attached to the participant via a custom-moulded dental mouthpiece. I demonstrated that the …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
… devices are to mitigate the deleterious effects of particulate matter on human health and the environment. Theories for the distribution of size and shape of soot particles in turbulent reacting flows are required, not only for accurate predictions related to flame characteristics but …
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The stability of model ecosystems
… only generate realistic dynamics when parasite effects are significantly larger than current empirical estimates, and I conclude it is likely that the model contains an inadequate level of detail. The simple strategic model was mathematically elegant and allowed mathematical concepts to be …