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 25 for “"Multiple timescales"”.
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Anomalous statistical properties and fluctuations on multiple timescales
… methods are stability and smoothness for timescales up to one fourth of the measurement time and the ability to neglect the slow dynamics and trends. Recently, a theory for an analytical understanding of this method was introduced. In this thesis, the method is further analyzed and …
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Representational dynamics across multiple timescales in human cortical networks
Human cognition occurs at multiple timescales, including immediate processing of the ongoing experiences and slowly drifting higher-level thoughts. To understand how the brain selects and represents these various types of information to guide behavior, this thesis examined representational content …
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Brain-wide representations of behavior spanning multiple timescales and states in C. elegans
… classes have conjunctive representations of multiple behaviors. Moreover, while many neurons encode current motor actions, others encode recent actions. Changes in behavioral state are accompanied by widespread changes in how neurons encode behavior, and we identify these flexible nodes in …
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The terrestrial carbon cycle in transition: tracking changes using novel tracers on multiple timescales
… climate conditions over centennial/millennial timescales. New Zealand was uninhabited by humans until the 13th century. Palaeo-environmental records that extend beyond the 13th century, therefore, exclude interference from anthropogenic factors, thus enabling the climate hypothesis to be …
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Exploring individual differences in the affective dynamics of bipolar spectrum psychopathology
… affective dysregulation is present across multiple timescales and contexts. Our preliminary studies suggested that bipolar spectrum psychopathology is associated with altered affective dynamics across seven days. Expanding on this work, we examined the association of bipolar spectrum …
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CELL TYPE-SPECIFIC EFFECTS OF OPIOID DEPENDENCE ON CENTRAL AMYGDALA NEURONS
… Growing evidence reveals that the CeA comprises multiple functional cell-types. While decades of research implicate the CeA in opioid withdrawal, the cell type-identity of the affected CeA cells has received little attention. In this dissertation, I profile a major subtype of neurons in the …
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Let It Go: Cognitive Strategy Use Selectively Changes Temporal Context Effects in Risky Monetary Decision-Making
… sensitive, affected by recent events on multiple timescales, including immediate (previous monetary outcomes), neighborhood (recently encountered values), and global (cumulative earnings relative to dynamic expectations) events. Such temporal context-dependencies are perplexing, because …
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Impact, spreading, and drying of complex fluid drops
… of impact, transport, and evaporation across multiple timescales. This perspective provides a mechanistic foundation for interpreting stains and for predicting wetting outcomes in applications ranging from forensics to engineered porous materials.
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Integrate-and-fire modelling of neuronal systems with modulatory properties
… was recently developed to model excitability on multiple timescales. We show that, in contrast to other integrate-and-fire models, the MQIF model allows realistic modelling of the modulation of excitability type and bursting, by capturing the balance between restorativity and regenerativity in …
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Bayesian time series models and scalable inference
… nonparametric model that can capture dynamics at multiple timescales while still allowing efficient and scalable inference. In the second part of this thesis, we develop a theoretical framework to analyze a special case of a highly parallelizable sampling strategy we refer to as Hogwild Gibbs …
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It’s Not Simple: Brain Signal Complexity as an Index of Neural Information Processing Described via Music Perception, Complexity and Reward
… complex brain signals with information at multiple timescales. The present body of work represents an effort to demonstrate that brain signal complexity can be an indicator of the information integration in the brain that supports cognition and behaviour. Study 1 establishes that …
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The Role of Orexin in Decision Making
… changes in metabolism often occur on slow timescales governed by energy-balancing processes. Decisions, in contrast, can be extremely rapid and can require behavioral responding to stimuli which are extremely transient in nature. It is not clear if/how the brain coordinates using slow …
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Physics-Aware Optimization and Data-Driven Methods for Low-Carbon Power Systems
… coordinate distributed grid-edge devices across multiple timescales and ownership boundaries? How do we develop and evaluate algorithms without access to real-world data? To address these questions this thesis proposes two physics-aware optimization frameworks that coordinate grid-edge resources …
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Oxidation of atmospheric organic carbon : interconnecting volatile organic compounds, intermediate-volatility organic compounds, and organic aerosol
… carbon is extremely complex, with reaction in multiple phases (gas, particle, aqueous) and at multiple timescales. The details of the lifecycle chemistry (especially the amount and properties of particles) have important implications for air quality, climate, and human and ecosystem health, and …
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Assessing the contribution and variations of spring discharges to river flows within the Nuwejaars Catchment, Cape Agulhas
… by monitoring rainfall and spring discharges on multiple timescales to unravel spring flow dynamics at various rainfall intensities.
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Sedimentation on a mixed siliciclastic/carbonate continental margin over decadal to millennial timescales: Gulf of Papua
… flux and sediment mass accumulation rates on multiple timescales. Patterns of sediment mass accumulation and inventory-derived 210Pb fluxes display regional variations, decreasing seaward, and along isobaths seaward from the northeastern shelf edge. The amount of terrigenous sediment load …
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Temperature-jump 2D IR spectroscopy to study protein conformational dynamics
… and separating spectral changes based on shared timescales. Finally, T-jump 2D IR spectroscopy is applied to study the unfolding of ubiquitin, disordering of the 12-residue p-hairpin peptide trpzip2 (TZ2), and the dissociation of insulin dimers to monomers. Experimental results for ubiquitin …
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Life on the Edge: Insights into the Neural and Behavioral Algorithms of Plume Tracking
… learning shapes edge-tracking behavior over multiple timescales and is necessary for continued pursuit of the plume. Moreover, compass neurons within the central complex, a navigational center, carry a high-fidelity representation of the animal's heading relative to the wind direction, and …
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Regulation of Global Transcription Dynamics During Cell Division and Root Development
… identifying biological processes occurring on multiple timescales is presented and applied to both datasets.</p><p>It is through the combination of these new genome-wide expression studies and computational tools that we begin to elucidate the transcriptional regulatory mechanisms controlling …
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Mesoscale Computational Analysis on the Reactivity of Heterogeneous Energetic Materials with Electromechanical Properties
… a two-step, multiphysics framework spanning multiple timescales is developed. The numerical simulations first track the development of electric field (E-field) in the material under external mechanical load over the microsecond timescale. The model uses a coupled mechanical-electrostatic …
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