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 19 of 19 for “"multistable"”.
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Multistable Shell Structures
Multistable structures, which possess by definition more than one stable equilibrium configuration, are capable of adapting their shape to changing loading or environmental conditions and can further improve multi-purpose ultra-lightweight designs. Whilst multiple methods to create bistable shells …
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Multistable and morphing corrugated shell structures
… studied: (i) 'flat' corrugated sheets, which are multistable under the action of internal stresses, 'snapping' between their flat state and a cylindrically coiled state: these shells are also capable of developing 'twisted' stable states. An algebraic model based on internal strain energy …
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Multistable systems under the influence of noise
Nichtlineare multistabile Systeme unter dem Einfluss von Rauschen weisen vielschichtige dynamische Eigenschaften auf. Ein mittleres Rauschlevel zeitigt ein Springen zwischen den metastabilen Zustaenden. Dieser “attractor-hopping” Prozess ist gekennzeichnet durch laminare Bewegung in der Naehe von …
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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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Multistable Political Becomings: A Postphenomenological Study of How Social Media Shape the Political Experiences of Young Brazilians
… textured world. This study finds that the highly multistable character of social media contributes to turning political becomings into multistable experiences, allowing individuals to get involved with the political in multiple non-exclusive ways, some more expressive, others more silent, some …
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Multi-stable Compliant Rolling-contact Elements
… concepts and models of large-angle, compliant, multistable, revolute joints. This research presents evidence of the capability of these models and concepts by presenting a case study in which the miniaturization of revolute joints are examined. Previous attempts at multistable revolute joints …
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State switching in multi-stable systems: control and optimisation.
This thesis studies state-switching in multistable systems, so that they can switch from inefficient operating states to a more efficient one, in order to achieve performance enhancement in real-life engineering systems. Multistable systems have more than one stable state under a set of parameters …
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Functional kirigami by exploiting elastic instabilities
… 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 a multistable kirigami architecture for mechanical …
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Elementary morphing shells
Multistable shells are not yet completely understood. Even under the widespread Uniform Curvature (UC) assumption, the limits of this behaviour have not been established and the influence of individual material and geometric parameters has not been described conclusively; this research explores …
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On Non-rigid Linkages
… broad class of systems — deployable structures, multistable trusses, origami-inspired architectures, and compliant mechanisms — that exhibit purposeful motion, elastic deformation, and geometric constraint simultaneously. Existing analytical tools do not fully describe such systems, particularly …
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Parameterized Shape Adaptive Material: A New Design Method for Inclusive Sportswear
… regulation in apparel pieces with standalone multistable panels, verifying that multi-stable structures can help achieve shape adaptive properties in apparel.
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Collective Dynamics of Interacting Cell Types
… Next, by coupling the transcriptional states of multistable single cells, I develop a general model of multicellular gene regulation that formalizes emerging notions of cell type “plasticity” and establishes a framework to study the self-assembly of compositionally diverse tissues from identical …
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Surface Friction and Spectroscopic Probes of New Physics with Trapped Ions
… trapped ion transported along a one-dimensional multistable energy landscape formed by a periodic, corrugated optical potential and a harmonic electric trapping potential. Two regimes of friction behavior are differentiated: single-slip (whereby an ion slips out of a corrugated groove and sticks …
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Entwurf und Regelung von multistabilen dielektrischen Elastomerwandler-Systemen auf Basis hybrider Modellierung
… tailored electromechanical properties and even multistable behavior can be realized. A essential challenge lies in modeling the strongly nonlinear, dynamically coupled mechanisms. While physics-based continuum models offer high accuracy, they are often too complex for control and design …
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Efficient and Generalizable Machine Learning Models for Predicting Complex Dynamics
… space without explicit structural priors. Using multistable dynamical systems as a test setting, we demonstrate that reservoir computers trained on trajectories from a single basin of attraction can achieve out-of-domain generalization by capturing system behavior in entirely unobserved basins. …
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From Pine Cones to Minimal Surfaces: The Geometry and Mechanics of Morphing Bilayers
… see how the coupling of these accounts for the multistable properties and geometry as aspect ratio is varied. Beyond the insights expounded, the approach extends the Uniform Curvature model for the study, design and fabrication of morphing bilayers and their subsequent applications.
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Design and Fabrication of Rotationally Tristable Compliant Mechanisms
The purpose of this research is to develop the tools necessary to create tristable compliant mechanisms; the work presents the creation of models and concepts for design and a demonstration of the feasibility of the designs through the fabrication of tristable compliant mechanism prototypes on the …
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Wahrnehmungswechsel bei mehrdeutigen Bildern - EEG-Messungen zum Zeitverlauf neuronaler Mechanismen
Die Betrachtung mehrdeutiger Reize (z.B. Necker-Würfel) führt zu spontanen Wahrnehmungswechseln. In bisherigen EEG-Untersuchungen zu diesem Phänomen wurde der Tastendruck der Versuchsperson als Referenz zur Mittelung genutzt, was zu hoher zeitlicher Ungenauigkeit führt. Mit einem verfeinerten …