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 178 for “"patchy"”.
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Predator Behavior and Prey Demography in Patchy Habitats
Habitat loss and fragmentation are among the greatest threats to biodiversity, and these threats can be exacerbated or alleviated by the presence of interacting species. The effect of habitat loss and fragmentation on predator-prey systems has received extensive theoretical attention, but empirical …
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Microbial community structure and dynamics on patchy landscapes
Microbes are tiny metabolic engines with large-scale effects on industry, the environment, and human health. Understanding how the micron-scale actions (and interactions) of individual microbes give rise to macro-scale consequences remains a major challenge in microbial ecology. However, for the …
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Motion of Janus and Patchy Particles Near Various Boundaries
… exploited. Among anisotropic colloids, Janus and patchy particles with different compositions and functionalities recently have drawn significant attention in the field of colloid science. They are known as promising candidates to address challenges in various fields such as emulsion …
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Impact of Patchy Vegetation on Wave and Runup Dynamics
… this dissertation evaluates the impact of patchy vegetation on wave and runup dynamics along coastlines. Selecting from a prototype in Dalehite Cove, Galveston Bay, TX, results from a Boussinesq model (COULWAVE) showed patchy vegetation reduced up to 75% mean shoreward current in the …
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Spatial models of metapopulations and benthic communities in patchy environments
… Such distributions are often referred to as patchy, and a patch-based approach to modeling ecosystem dynamics has become a major research focus. These models have been used to explore a wide range of questions concerning population, metapopulation, community, and landscape ecology, in both …
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Polymer-patchy nanoparticles synthesis and self-assembly into reconfigurable networks
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… structure and function. I utilized spatially patchy distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant interactions and the implications of this conditionality for community invasibility. Additionally, I expanded …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
… structure and function. I utilized spatially patchy distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant interactions and the implications of this conditionality for community invasibility. Additionally, I expanded …
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Superior to one of Glass: Natural Gradient index Lenses via Patchy Particle Self-Assembly
… lens using a suite of proteins that can act as patchy colloids with specific, low valence (M=2 or M=3) with geometric flexibility in bond angles. We conducted small x-ray scattering (SAXS) at different radial positions of the lens, and performed a Monte Carlo simulation to estimate structures …
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Causes and consequences of patchy spatial distribution in male and female fairy shrimp, Eubranchipus bundyi
… and deeper in the water column than males. The patchy distribution of fairy shrimp (E. bundyi) may be the result of egg hatching cues, microhabitat preferences in regards to light level, and the cryptic behavior of females. Behavioral differences between the sexes may expose males and females to …
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Bottom-up Self-Assembly across Hierarchies: From Triblock Terpolymers to Patchy Particles to Colloidal (Co-)Polymers
… blocks into nano-scale corona-compartmentalized (patchy) particles via selection of kinetic self-assembly pathways. An extremely efficient and versatile step-wise self-assembly process was developed offering unique nano-engineering capabilities over addressable corona patches. Thereby, carefully …
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Persistence mechanisms of Erodiophyllum elderi, an arid land daisy with a patchy distribution / Louise M. Emmerson.
… in terms of life history strategies and patchy population theory.
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Lost in Starvation: How the interplay between physiology and ecology impacts bacterial persistence in a patchy landscape
Heterotrophic marine bacteria navigate a heterogeneous landscape of resources. Bacterial populations cycle through periods of feasting when attached to nutrient particles and periods of famine when foraging between hotspots; thus, bacterial physiological states and ecological processes are …
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Migration strategies and circannual patterns of habitat use of snowfinches (Montifringilla nivalis nivalis) in a patchy alpine landscape
Biodiversity is intimately linked with ecosystem functioning, and thus with human well-being. Changes are occurring at a worrying rate, in response to overexploitation, pollution, species invasions, habitat fragmentation and alteration and climate change. Species responses are not always linear or …
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Synthesis and self-assembly of multiblock and Janus particles
… both building blocks and interaction patterns of patchy colloids in liquid suspension, towards the long-term goal of developing the practical capability to make a colloidal structure, or any colloidal material, that is “assemblable”. Two levels of efforts are included in this thesis, first, the …
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Glacial Stratigraphy of northeastern North Dakota
… Cando Formation, widespread in the west, patchy in the east; Tiber Formation, alisent in the west, patchy in the east; Vang Formation, patchy over the entire area; Gardar Formation fairly widespread over the entire area; Dahlen Formation, widespread over the entire area; Hansboro Formation …
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Crystalline-core micelles based on triblock terpolymers with polyethylene middle blocks
… of PE resulted in spherical CCMs with a patchy or a homogeneous corona depending on the used triblock. These findings allow the highly selective production of stable spherical or worm-like CCMs from the same polymer. As the corona structure of the patchy micelles self-assembled from …
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Janus Particles at the Air-Water Interface: Single particle behavior, particle-laden interfaces, and implications for self-assembly
… these applications is synthesizing high quality patchy particles and nanoscale Janus particles. To this end, a density gradient centrifugation (DGC) technique has been tested and enables the synthesis of micron-scale patchy particles and Janus particles on the length-scale of light. The DGC …
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Petrological and geochemical study of spilites and associated dike rocks from the Virgin Island core (Caribbean Island arc)
… (epidote, quartz, chlorite) than the dark patchy material. The patchiness decreases with depth and below 650 feet disappears, being replaced by a homogeneous, fine-grained spilite. ’Below the non-patchy spilite, there is a sheared and recrystallized spilitic zone which contains epidote, …
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