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 28 for “"Interaction strengths"”.
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Interaction strengths and net effects in food web models
… the scaling of intraspecific and interspecific interaction strengths in a three species food chain and a series of theoretical analyses on the changes to equilibrium biomass abundances following press perturbations. The empirical experiment is a consequence of the difficulties faced when …
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Modelling the evolution of biological complexity with a two-dimensional lattice self-assembly process
… principal actor in self-assembly is the binding interactions between subunits, and so geometric constraints, polarity, kinetic forces, etc. can often be marginalised. This work explores how self-assembly and its outcomes are inextricably tied to the involved interactions through the use of a …
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Out-of-equilibrium dynamics in a tuneable homogeneous Bose gas
… box trap. The experiment features both tuneable interaction strengths and a homogeneous atomic density. We examine first a weakly interacting near-equilibrium system, followed by far-from-equilibrium dynamics under moderate interactions, and finally combine strong interactions with highly …
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Atom-by-Atom Substitution of Transition Metals in Gallium Arsenide and Visualization of Hole-Mediated Interactions
… the first controlled atomic scale study of the interactions between isolated Mn impurities mediated by electronic states in GaAs. High-resolution STM measurements provide visualization of the GaAs electronic states that participate in Mn-Mn interactions. We quantify the interaction strengths …
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Biological control of Culex mosquitoes using multiple predators
… be applied to quantify context-dependencies of interaction strengths. However, the use of FRs alone fails to account for population-level effects (i.e. Numerical Response, NR). <br/><br/>This study examines the efficacy of multiple biocontrol agents towards vectorially-important mosquito …
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A cold strontium Rydberg gas
… to study the novel effects of strong interatomic interactions. This thesis describes the design and construction of the world's first experiment to study Rydberg states in a cold gas of an alkaline earth metal, in this particular case strontium. We have studied a wide range of Rydberg states, and …
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Dynamics in a Fermi lattice gas
… measuring the transport lifetime at various interaction strengths and temperatures. The resistivity is inferred from the measured transport lifetime. We observe anomalous transport behavior, which is analogous to bad-metal behavior in strongly correlated electronic materials. The second …
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Nuclear Spin Relaxation and Diffusion Studies of Adsorption and Dynamics at the Catalyst-Liquid Interface
… processes requires a detailed understanding of interactions occurring at the solid-liquid interface. The elucidation of such dynamics is of particular relevance to the study and development of solvated green chemical reaction processes, such as the production of chemicals and fuels from biomass. …
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Algal resource depression by macro-invertebrate herbivores in a chalk stream: An empirical approach
… the strength of these algal-herbivore interactions, or how these vary with herbivore identity, size, and biofilm physiognomy. Interactions across a diverse herbivore guild were investigated in a chalk stream, using mesocosms to determine the distribution of algal-herbivore interaction …
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On effective field theory of dark matter
… may interact through an electromagnetic dipole interaction at dimension 5 on energy transport in the Sun. In particular, we test whether the models can provide a solution to the solar abundance problem, a theoretical discrepancy between the observations of helioseismology and the theoretical …
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The Influence of Changing Nutrients and Warming on Phytoplankton and its Interactions with Zooplankton in the North Sea
… Chl-a) and phytoplankton–zooplankton interactions using long-term satellite and in situ data. Satellite ocean-color analyses show predominantly declining Chl-a anomalies across the German Bight, with localized increases near the Elbe estuary. SST explains part of the long-term Chl-a …
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A multi-indicator approach to dietary assessments within Lake Michigan's nearshore area
… ecology, is the evaluation of predator-prey interaction strengths and their spatial heterogeneity. Traditional dietary assessment methods of examining individual’s stomach contents provide valuable data quantifying relationships, however what is incorporated into organisms is not always …
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Computational investigation of light harvesting in purple photosynthetic bacteria
… which does not rely on assumptions of relative interaction strengths and includes quantum coherence effects. An efficient implementation of the HEOM is developed and utilized to describe exciton dynamics in the light harvesting complexes of purple bacteria, and calculate excitation transfer …
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Resilience in marine ecosystems: the effects of environmental and ecological context on ecosystem multistability
… i.e. food web connectance, predator-prey interaction strengths and species richness; 2) The effects of multiple stressors or press perturbations on the susceptibility of food webs to episodic shocks or pulse perturbations, i.e. systems were stressed with press perturbations including …
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Structure formation and fractionation in systems of colloidal rods
… Carlo simulations in the NPT ensemble. Repulsive interactions can successfully be mimicked by the hard rod model, which has been studied extensively in the past. In many cases, attractive interactions like van der Waals or depletion forces cannot be neglected, however. In the first part of this …
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Atom-by-Atom Substitution of Transition Metals in GaAs and Visualization of Hole-Mediated Interactions
… requires understanding the mechanisms for interactions between magnetic dopants and identifying the circumstances that maximize ferromagnetic interactions. In this thesis, we present a novel atom-by-atom substitution technique with the scanning tunnelling microscope (STM) to controllably …
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Effects of seed dispersal by gibbons, sambar, and muntjac on Choerospondias axillaris demography, and the disruption of this mutualism by wildlife poaching
… seed dispersal will have more room for skewed interaction strengths among their dispersers. In measuring functional redundancy or in trying to predict the role of diversity in species interactions, we must explicitly account for variation in life-history traits.
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Effects of seed dispersal by gibbons, sambar, and muntjac on Choerospondias axillaris demography, and the disruption of this mutualism by wildlife poaching
… seed dispersal will have more room for skewed interaction strengths among their dispersers. In measuring functional redundancy or in trying to predict the role of diversity in species interactions, we must explicitly account for variation in life-history traits.
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NMR AS A TOOL TO QUANTITATIVELY CHARACTERIZE MOLECULAR MECHANISMS GOVERNING ACTIN DYNAMICS AND RICE LATERAL ROOT DEVELOPMENT
Protein-Protein interactions are fundamental for varied biological processes. These interactions are governed by different forces between the proteins, which result in a wide range of interaction strengths. Nuclear Magnetic Resonance (NMR) is an atomistic technique commonly used to understand …
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Quantum simulations in interacting Rydberg synthetic dimensions
… strong, long-range, and tunable dipole-dipole interactions between Rydberg atoms, this approach significantly extends the capabilities of synthetic dimensions into the strongly interacting regime, enabling the exploration of quantum many-body phenomena beyond the reach of mean-field …
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