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 23 for “"Multistability"”.
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Noise and multistability in gene regulatory networks
Proteins are the functional machinery in living cells. Proteins interact with each other and bind to DNA to form so-called gene regulatory networks and in this way regulate the level, location and timing of expression of other proteins. Cells implement feedback loops to create a memory of their …
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Commonalities And Differences In Visual And Auditory Multistability
… is causally involved in both visual and auditory multistability as a top-down mechanism. Transcranial magnetic stimulation on the anterior and posterior superior parietal cortex did not increase or decrease the median phase durations in response to the ambiguous motion and auditory streaming. …
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Resilience in marine ecosystems: the effects of environmental and ecological context on ecosystem multistability
… the factors in each study influenced ecosystem multistability is presented.<br/><br/>The work of this thesis highlights 4 main points for consideration: 1) the necessity of future studies to consider multiple forms of stability simultaneously as analysis of single stabilities alone can present …
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Theory and applications of multifunctional reservoir computers
… a single neural network that exploits a form of multistability to perform a multitude of mutually exclusive tasks. The dynamics of multifunctional RCs are assessed across several tasks and from this many new application areas are explored which include, data-driven modelling of multistability, …
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Advances in the stochastic and deterministic analysis of multistable biochemical networks
This dissertation is concerned with the potential multistability of protein concentrations in the cell that can arise in biochemical networks. That is, situations where one, or a family of, proteins may sit at one of two or more different steady state concentrations in otherwise identical cells, …
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Transitions-felt: William James, Locative Narrative and the Multi-stable Field of Expanded Narrative
… Extending the cognitive term ‘perceptual multistability’, that refers to switching between interpretations experienced when we look at an ambiguous figures, such as, the Necker cube, this thesis develops the position that expanded narrative practices and specifically locative narrative, a …
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The Curricular and Instructional Implication for the Tacit Knowledge Exhibited While Creating a Forensic Craniofacial Reconstruction
… & Page as the bases for a Grounded Theory of Multistability to account for implications of tacit knowledge information processing problem-negotiating processes in curriculum and instruction.</p> <p>The major findings from the data highlight the participants’ philosophical foundation beliefs, …
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From Pine Cones to Minimal Surfaces: The Geometry and Mechanics of Morphing Bilayers
… investigate problems of buckling and multistability. However, owing to the free edge, this model fails to capture higher order effects pertaining to a boundary layer phenomenon, in which moments must dissipate, and hence geometry vary beyond the quadratic terms near the boundary. …
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Nonlinear transport in semiconductor superlattices
… without time-dependent driving exhibits multistability for sufficiently large magnetic or self-consistent electric fields, and spontaneous current generation at zero bias is predicted for certain nonequilibrium ""hot"" electrons. We examine several limiting cases of this model to guide …
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Multistable and morphing corrugated shell structures
… just a single, or very few, components. When multistability is introduced into compliant structures, an even greater simplification can be made, with actuators and/ or locking mechanisms becoming redundant. Corrugated shells are commonly encountered at all scales of engineering, providing …
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Design of Kresling inspired architected materials by using Polyjet technique
… and experimentally, aiming to achieve multistability and tunable energy landscapes. Hence, this analysis extends the obtained geometrical and material design hints to mono-material printing and micro-fabrication. Therefore, this work contributes to advancing our understanding of 3D …
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Elementary morphing shells
… control parameters on the availability of multistability is described in closed-form while a unique graphical overview of the limits of this behaviour is provided. In the lab, a novel tristable shell is constructed from a laminate and the use of specialized materials is scrutinised. In a …
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Deep Learning For Surrogate Modeling And Uncertainty Quantification In Science & Engineering
… problems, such as ill-posed inverse mappings, multistability, and chaotic dynamics. In these settings, standard regression trained with mean squared error collapses multimodal solution sets to conditional averages that can be physically invalid. To address this limitation, the thesis revisits …
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On Non-rigid Linkages
… multiple equilibria and formulate our own novel multistability framework. This reveals a direct correspondence between topological motifs and multistable energy landscapes, supported by physical prototypes. The framework is then generalised to multi-loop linkages, where we identify topological …
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Multi-stable Compliant Rolling-contact Elements
… for detents and other fatigue prone devices. Multistability may be achieved by placing the CORE flexure into tension or using flexible segments attached to the foci; or by changing the initial curvature of the flexure, curvature of the CORE surface, cross sectional area of the flexure (both …
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Functional kirigami by exploiting elastic instabilities
… kirigami architecture enabled by intrinsic multistability was developed. Harnessing the proposed multistable kirigami architecture as tunable mechanical metamaterials, soft robotic grippers, and mechanical logic computing units are investigated. The first part of this dissertation introduces …
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Towards structure and dynamics of metabolic networks
… (CRNT) allows for eliciting conclusions about multistability directly from the structure of metabolic networks. Although CRNT is based on mass-action kinetics originally, it is shown how to incorporate further reaction schemes by emulating molecular enzyme mechanisms. CRNT is used to compare …
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Methods for Analysis of Nonlinear Thermoacoustic Systems
… display rich nonlinear behaviour and regions of multistability are found. Gradient methods can also efficiently calculate the limit cycles of large systems. A scalar cost function is defined that describes the proximity of a state to a limit cycle. The gradient of the cost function is used in an …
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Multistable Shell Structures
… into the promoting and eschewing factors of multistability and aims to point out methods to exploit this feature in optimised ways. The aforementioned seemingly simple example requires a geometrically nonlinear perspective on shells for which analytical solutions stay elusive unless …
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