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 28 for “"Non-linear Time"”.
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Investigation of the Photophysical Properties of pi-Conjugated Polymers. A Study by Non-Linear, Time-Resolved, and Single-Molecule Spectroscopy
… (2P) fluorescence excitation spectroscopy and time-resolved spectroscopy on thin MeLPPP-films as well as by fluorescence spectroscopy on individual MeLPPP-chains. Employing continuous-wave 2P fluorescence-excitation spectroscopy on MeLPPP the symmetry properties of the vibronic wave functions …
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A técnica da linearização equivalente no cálculo da resposta permanente de plataformas marítimas fixas
… of this work is to present the equivalent linearization technique as well as to analyse such approximation in order to obtain the steady state response of fixed offshore platforms under cyclic loads. The linearization is applied to local non linearity arising from hysteretic soil structure …
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Base isolation case study
… is modeled using SAP2000 structural program. The time history of Northridge earthquake is used as a seismic forcing function of the structure. The base isolator is designed by using the principle of bilinear modeling. Therefore, the base isolation system is analyzed using the non-linear time …
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An Investigation of Determinism and Chaotic Behavior in Flight Performance Data: A Chaos Theory and Nonlinear Time Series Analysis Approach
… flight performance data were investigated using non-linear time series analysis methods to determine deterministic chaotic behavior in the data. Using a sequence of steps of non-linear methods, four flight performance data were used to investigate for the existence of deterministic chaotic …
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Dynamic Model and Adaptive Control of a Transcritical Organic Rankine Cycle
… Transcritical Organic Rankine Cycle (TORC) is a non-linear time-varying heat recovery system for small-scale power generation. It is similar to a boiler-turbine system but uses organic fluid as the primary heat carrier instead of H2O and works in both subcritical and supercritical regions. The …
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Time-series analysis using orthogonal polynomials
Advances in the study of non-linear dynamics have encouraged the construction of models and simulators of non-linear time-series. Researchers in the field of both science and statistics have come up with innovative methods that are useful in extracting information from systems that exhibit …
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Robust numerical methods to solve differential equations arising in cancer modeling
… implementation of reliable numerical methods for nonlinear, first order delay differential equations, second order non-linear time-dependent parabolic partial (integro) differential problems and optimal control problems arising in cancer modeling. The development of cancer modeling is necessitated …
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Modelling Locally Changing Variance Structured Time Series Data By Using Breakpoints Bootstrap Filtering
… Special classes of such processes deal with time series of sparse data. Studies in such cases focus in the analysis, construction and prediction in parametric models. Here, we assume several non-linear time series with additive noise components, and the model fitting is proposed in two …
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Reduced Order Modeling of Flapping Wing Flight Dynamics
… physical principles are often more complex – non-linear time varying dynamics are dominated by forcing due to complex, unsteady aerodynamics. Reduced order models are critical to formulating tractable sensing and control concepts from the complex physics of flapping wing flight. Previous …
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Modeling and Control of a Six-Switch Single-Phase Inverter
… model of the six-switch single-phase inverter. A non-linear time invariant model is constructed for circuit simulation; details found in real circuits are added. A hardware-in-the-loop (HIL) configuration is used for more accurate simulation. In fact, its use makes for an almost seamless …
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Mitigating timing noise in ADCs through digital post-processing
… is greatly affected by the uniformity of the times at which samples of the analog input signal are taken. The error in the sample times, known as jitter, or timing noise, has a non-linear, time-varying and input-dependent effect on the sample values, as opposed to the additive noise usually …
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Realising data-centric UAV autonomy through learning-based prediction and feedback integration
Unmanned aerial vehicles (UAVs) operate under non-linear, time-varying dynamics and distribution shift, where classical controllers depend on accurate models and extensive gain tuning. This dissertation develops an end-to-end pipeline — from raw flight logs to a deployable closed loop — that …
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Bootstrap methods and parameter estimation in time series threshold modelling
… performance estimation of parameter estimates in non-linear time series models, in particular SETAR models (Tong, 1993). First and higher order SETAR models in known and unknown thresholds cases are considered. To assess the performance of bootstrap methods, we first give an extensive simulation …
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Mathematical Models of Prevascular Tumor Growth by Diffusion
… factors. The effects of geometry and spatially non-uniform inhibitor production and non-uniform nutrient consumption on the prevascular tissue growth are examined. The concentrations of nutrients and growth inhibitor are governed by diffusion processes, and thus the equations are of diffusion …
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Assessment of Perforated Unreinforced Masonry Walls Responding In-Plane
… and energy dissipation capacity of the system. A non-linear Equivalent Frame modelling method for perforated URM walls using the structural analysis software SAP2000 was appropriately validated using modelling results and experimental data. Spandrel behaviour was included within the modelling …
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Constrained control allocation for systems with redundant control effectors
Control allocation is examined for linear time-invariant problems that have more controls than degrees of freedom. The controls are part of a physical system and are subject to limits on their maximum positions. A control allocation scheme commands control deflections in response to some desired …
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Neoliberalism, development, and environmental crises in contemporary South Asian Anglophone fiction
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Seismic behavior of semi-rigid steel frames
… and successfully completed. Furthermore, nonlinear dynamic response-history analyses of semi-rigid frames with varying design parameters were conducted to evaluate the system performance under seismic events. The results of the hybrid simulation and the parametric studies are used to …
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What the Earth Remembers: Landscape and Materiality in the work of Sally Mann, Mark Bradford, and Tacita Dean
… on Henri Bergson’s notion of heterogeneous time, I argue that these artists’ material experiments unfix histories of place. While the past informs how we can understand these works of art, they also change how we understand the past.</p> <p>My first chapter on Sally Mann focuses on her …
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Application of SMA fiber composite as seismic reinforcement for concrete moment resisting frames
… conventional steel bars. However, due to their linear elastic behavior, they are not considered in structures which require ductility and damping characteristics. The use of shape memory alloys (SMAs) with their nonlinear-elastic behavior in the composite could potentially provide solution for …
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