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 209 for “"spatial heterogeneity"”.
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Damage-Induced Spatial Heterogeneity of Photosynthesis: Mechanisms and Analysis
… damage in soybean and hardwood species using spatially resolved measurements of Photosystem II quantum efficiency (phiPSII). I hypothesized that distinct classes of foliar damage differentially influence the spatial pattern of photosynthesis of the remaining tissue by various mechanisms, …
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Water Quality Spatial Heterogeneity in Wastewater Stabilization Ponds at Elevated pH
… field scale monitoring program that examined spatial and temporal water quality patterns in the first WSP at the WPCP. Results demonstrated that NO3- and PO43- were removed within the WSP, and that pH, DO, alkalinity, and total NH3 increased within the WSP. It was found that spatial …
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Spectral and Spatial Heterogeneity in Molecular Assemblies of Amino Styryl Pyridinium Dyes
… of aggregate sizes in thin films of I. Spatial heterogeneity visualized by epi-fluorescence microscopy reveals a morphology of coexisting liquid expanded (LE), liquid condensed (LC), and locally collapsed phases. The large spectral shift associated with aggregation of I allows its …
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Analysis of the spatial heterogeneity of land surface parameters and energy flux densities
… require as many datasets from different spatial scales as possible. This work contributes to this topic by implying different datasets from different platforms. Its objective was to analyse the spatial heterogeneity of land surface parameters and energy flux densities obtained from both …
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Investigating circuit and spatial heterogeneity of human brain tumors with patient-derived organoid models
… with dismal prognosis. Both malignant cell heterogeneity and the influence of myriad cell types present in the tumor microenvironment, such as neurons, contribute to glioma progression. This dissertation represents a multi-pronged effort to unravel GBM heterogeneity by leveraging …
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Flamingo foraging activity as a driver of spatial heterogeneity in Langebaan Lagoon, South Africa
… These small-scale differences, as well as the spatial (and possibly temporal) variation in structures generate habitat complexity. Thus, this preliminary study supports the notion that flamingo foraging activity is a key driver of spatial heterogeneity in Langebaan Lagoon and highlights the …
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Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada.
The availability of essential nutrients, such as nitrogen, phosphorus, and trace elements, fundamentally influences biological production. This is especially critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current …
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Mechanisms of observed spatial heterogeneity in rainfall variability over the winter rainfall zone of South Africa
… this has yielded little insight into the spatial heterogeneity in WRZ climatological seasonality and rainfall variability or their drivers, despite such understanding being crucial for interpreting past and robustly projecting future climate change patterns. Hence, the spatial …
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Idealized particle-resolved large-eddy simulations to evaluate the impact of emissions spatial heterogeneity on CCN activity
… within large-scale modeling frameworks. The spatial resolution of these models (typically 10–100 km) is often coarser than the scale of the spatially varying emissions in the modeled geographic region. This results in diffuse, uniform concentration fields of primary aerosol and gas-phase …
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Exploring spatial heterogeneity of CPUE year trend and nonstationarity in fisheries stock assessment, an example based on Atlantic Weakfish (Cynoscion regalis)
… species. My study aimed to explore the possible spatial heterogeneity of CPUE (catch per unit effort) year trend based on three fishery independent surveys and explore the influence of nonstationary natural mortality on the fisheries management through a MSE (Management Strategy Evaluation) …
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Understanding pattern-process relationships in a heterogeneous landscape effects of large termitaria on diversity and disturbance regimes in Miombo woodlands of Northern Zimbabwe
Spatial heterogeneity has been shown to influence ecosystem processes and important ecosystem properties like resilience and biodiversity, allowing species with specific habitat needs or weaker competitive abilities to persist in disturbed systems that might otherwise have excluded them. Miombo …
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Analysis and Simulation for Homogeneous and Heterogeneous SIR Models
… on the global disease dynamics. The spatial heterogeneity of the metapopulation with nonrandom directed movement between populations is incorporated into a heterogeneous SIR model with nonlinear incidence. The analysis of the combined effects of the spatial heterogeneity and nonlinear …
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Multiscale Monte Carlo study of epidermal growth factor receptor diffusion and dimerization
… and dimerization. Using the CGMC method, spatial modeling of ligand-mediated membrane receptor dimerization reaction dynamics was performed. Furthermore, the simulations demonstrate the importance of spatial heterogeneity in membrane receptor localization. Mathematical models, especially …
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Efficient Sampling Methods for Forest Inventories and Growth Projections
… pine plantations with varying degrees of spatial heterogeneity were generated at different stages in stand development. Repeated sampling was used to examine various sampling schemes and growth projection methods. Highlights for the four topics follow: 1. Stand total volume can be reliably …
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Statistical Physics of Soft Random Solids: Vulcanization, Heterogeneity, and Elasticity
… part of this thesis, Chapters 3, 4, and 5, spatial heterogeneity in the elastic properties of soft random solids is examined via vulcanization theory. The spatial heterogeneity in the structure of soft random solids is a result of the fluctuations locked-in at their synthesis, which also …
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