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 14 of 14 for “"non-linear interaction"”.
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Interação local-global na flambagem de colunas de seção U enrijecida
… A semi-energy method is used to investigate the non-linear interaction between the local and global flexural buckling modes. The results of this analysis show the stable and unstable local post-critical equilibrium paths, for various columns, plus the growth of membrane stress distribution during …
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The influence of superhydrophobic surfaces on near-wall turbulence
… of the overlying turbulence, which remains canonical and smooth-wall-like. In these cases the flow is governed by the difference between two virtual origins, the virtual origin of the mean flow and the virtual origin experienced by the overlying turbulence. Streamwise slip deepens the virtual …
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An Investigation of the Variability of Tides in the Upper Mesosphere (Meteor Radar)
… nature of the observed variability suggests a non-linear interaction of the tide with gravity and/or planetary waves. The semidiurnal tide also exhibits phase fluctuations indicating the possible presence of a transient S(,2,3) mode.
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Methodologies for active control of free shear flows
… In contrast, excitation of the jet with non-integer and counter propagating azimuthal modes yielded marked changes in the jet evolution. A new method employing dynamic spatial modes to control the far field of a circular jet is examined in Chapter 3. The basic mechanism that governs the …
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Practical Methods for Scalable Bayesian and Causal Inference with Provable Quality Guarantees
… and computationally challenging due to non-linear interaction effects, unobserved confounders, and the lack of randomized experimental data. In this thesis, I start by addressing the problems of variable selection and estimation when there are non-linear interactions and fewer datapoints …
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Flow Dynamics in Large River Basins: Self -Similar Network Structure and Scale Effects
… hydrologic response of a basin is shaped by the non-linear interaction between runoff generation, river-network geomorphology and the hydrodynamics of channel flow. In this research, the processes which contribute to the variance of the network hydrologic response are investigated by coupling the …
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A numerical study of surface air temperature response to vertical mixing and momentum extraction by wind farms and the impacts of wind farms on mesoscale boundaries
… run is compared to the experimental tests. The non-linear interaction of hub height wind speeds, thrust coefficients, and TKE coefficients along with the wind turbine layer static stability determine the temperature change impact. During night, statically stable conditions result in strong …
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The effect of texture granularity on turbulence
… interacts with the overlying turbulence in a non-homogeneous fashion, and turbulence is no longer smooth-wall-like. This is the typical effect of surface texture observed in rough surfaces, and results in a degradation of drag. In this thesis, we argue that the texture modifies the overlying …
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Quantifying hurricane wind speed with undersea sound
… in the 0.1 to 0.6 Hz frequency range through the non-linear interaction of ocean surface waves. Here we model microseisms generated by the spatially inhomogeneous waves of a hurricane with the non-linear wave equation where a second-order acoustic field is created by first-order ocean surface wave …
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ESSAYS ON NONPARAMETRIC ESTIMATION OF HETEROGENEOUS CAUSAL EFFECTS
My dissertation studies semi- and non-parametric estimation strategies for the distribution of heterogeneous causal effects with applications to labor economics and macroeconomics. \par In the first chapter, I propose a nonparametric strategy to identify the distribution of heterogeneous causal …
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Multi-Scale Localized Perturbation Method for Geophysical Fluid Flows
… evolution of the perturbation component. One-way interaction which arises due to non-linearity in the original differential equations appears in this second equation, allowing the background fields to influence the evolution of a perturbation. Several solution methods for this system of equations …
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Scale Interactions within a Perturbed Plane Wall Jet
… the flow interact with the smaller scales in a non-linear manner including through a process of amplitude and frequency modulation. A plane wall jet (PWJ) is chosen as the model flow field for this work as its unique geometry allows for the controlled introduction of large-scale perturbations …
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Adoption of costing system sophistication and non-financial performance: evidence from Democratic Republic of Congo
… among Congolese firms and the impact of CSS on non-financial performance. Far from the traditional linear concept of organisation, this study apprehends organisation as a complex adaptative system of non-linear interaction. In this regard a triangulation between contingency and complexity theory …
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The influence of Arctic sea-ice loss on mid-latitude weather and climate: exploring sensitivities and mechanisms
… makes it difficult to robustly determine the linearity of the response to different loss magnitudes. A stratospheric nudging method is then implemented in IGCM4 to isolate the roles played by tropospheric and stratospheric mechanisms in the remote response to sea-ice loss. For Atlantic sector …