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 61 for “"avalanches"”.
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Avalanches in disordered systems
The idea of systems that evolve via avalanches is a simple, yet powerful one. A collection of elements that interact with one another, with each element possessing the ability to change the state of other elements when it undergoes a change. These other newly changed elements may affect yet more, …
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Nucleation of large avalanches
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Modeling friction force avalanches in molybdenum disulfide and spiking neuronal avalanches in mouse cortex
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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Phase transitions and avalanches in synchronizing systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Avalanches in stars and at finite temperature
We study two related but distinct aspects of avalanches in physical systems. The first is the study of avalanches that we have observed in stars. We apply results from the mean field avalanche model to observations made by the \emph{Kepler} spacecraft and the VIRGO instrument, looking at several …
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Avalanches, percolation, and stochastic damage evolution in disordered media
… which results in precursory events observed as avalanches in experiments and simulations. We use a jump Markov process to model the stochastic evolution of damage. The Markov process is informed by the avalanche size distribution for a given quasibrittle material. The fiber bundle model (FBM) is …
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Statistics of slip avalanches in sheared amorphous materials based on atomistic simulation
… found that amorphous materials deform via slip avalanches in the plastic regime, which are bursts of plastic flows and show scale free features, as evidenced by a power-law probability distribution of the magnitude of serrations in stress-strain curves. Mesoscale models of amorphous plasticity, …
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On the observations of autowaves and avalanches in an aluminum magnesium alloy
… behavior which is attributed to dislocation avalanches. The strain magnitudes for these autowaves and dislocation avalanches are much lower than would be observed for a plastic burst developed from the Portevin-Le Chatelier effect. Fourier analysis on the global load signal confirms the …
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Avalanches in plastic deformation: maximum velocity statistics, finite temperature effects, and analysis of low time resolution data
… consists of intermittent jumps called avalanches, whose sizes are power-law-distributed over a scaling regime. In this thesis, we study the statistics of a simple mean-field avalanche model, with emphasis on both theoretical calculations and application to the analysis of experimental …
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One-dimensional modelling of rock-ice avalanches: mathematical features, numerical solutions, and strategies to enlarge the hyperbolic range
Rock-ice avalanches are three-phase flows composed of rock, ice, and a liquid. As their occurrences might increase in the future due to climate change, constructing mathematical and numerical models able to simulate these flows could be necessary for good hazard assessment and management in cold …
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Temporal properties of avalanche dynamics
Slip avalanches occur in both crystalline and amorphous solids. Slip avalanches and avalanches in other systems are thought to be critical phenomena linked to a nonequilibrium phase transition. In this thesis we explore some temporal properties of experimental slip avalanche dynamics. These …
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Automated avalanche mapping with deep learning: from satellite to webcam imagery
Humans have been exposed to snow avalanches ever since they inhabited or travelled through mountainous regions. For centuries, ways of managing risk and mitigating damage due to avalanches have been limited. For example, forests prevented the release of avalanches, protecting the villages below. In …
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Feasibility of Seismic Monitoring to Identify Avalanche Activity: Snoqualmie Pass, WA
<p>Avalanches across the Interstate-90 corridor over Snoqualmie Pass, in Washington State, are a concern for winter travelers and backcountry recreation. The temporary closure of the interstate for avalanche mitigation work also affects commerce by delaying transportation of merchandise. The study …
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Using avalanche statistics to forecast failure in models of earthquake faults and magnets
Avalanches - bursts of activity spanning a vast range of sizes - occur in a wide variety of dynamical systems, such as magnets, granular matter, earthquake faults, neuronal networks, and of course the classic example of snow flows on mountains. By studying the statistics of avalanche sizes, we can …
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Plasticity as a depinning phase transition
… deform in an intermittent way with slip-avalanches that are power-law distributed. In this work we study plasticity as a pinning-depinning phase transition employing a discrete dislocation dynamics (DDD) model and a phase eld crystal (PFC) model in two dimensions. Below a critical ( ow) …
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Object-based image analysis for detecting landforms diagnostic of natural hazards
… gullies, dunes, lava fields, landslides and snow avalanches, as these landforms tend to be more heterogeneous than the surrounding landscape. A single roughness metric is often limited in such detections; however, a more complex approach that exploits the spatial relation and the location of …
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Collective dynamics in lattice models far from equilibrium
… numerical simulations that the phenomenology of avalanches—which are sharply defined only at zero temperature—also persists over a significant range of finite temperatures. We analyse the main differences between the thermal and zero-temperature systems, including an excess of small avalanches in …
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Analysis of landslide volume, structures, and kinematics from satellite imagery of the 2016 Lamplugh rock avalanche, Glacier Bay National Park and Preserve, Alaska, An
… the past five years occurrences of large rock avalanches over glaciated terrain in Glacier Bay National Park and Preserve (GBNP), Alaska have drawn attention to the complex, highly variable, yet poorly understood dynamics of these events. The objective of this research is to study the …
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Avalanching on dunes and its effects: Size statistics, stratification, & seismic surveys
… that the behaviour of the consequent, discrete avalanches alternates between two regimes, typified by their size statistics. Reconciling the `self-organised criticality' that several authors have predicted for such a system with the hysteretic behaviour that others have observed, the system …
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Investigating the Relationships Between Disorder, Structure, and Dynamics in Amorphous Systems
… the evolution of structure during strain-induced avalanches in athermal, amorphous systems using numerical simulation of soft spheres. We find that these avalanches can be decomposed into a series of bursts of localized deformations, and we develop an extension of persistent homology to isolate …
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