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 58 for “"spatial differences"”.
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Application of ANOVA for the analysis of temporal and spatial differences in the length of pelagic goby preyed on by Cape fur seals in the coasts of Namibia
… In this thesis, ANOVA was used to uncover the differences in goby length preyed on by three different colonies of fur seals at the Namibian coast. Moreover, ANOVA was used to investigate temporal differences in lengths of goby preyed on by fur seals in each location of the seal colonies. …
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Estimating Trophic Position of Lake Oahe Walleye Using Stable Isotope Analysis
… quantified both annual changes in prey use and spatial differences across reservoir zones (riverine, transition, and lacustrine). Spatial differences in prey consumption strongly corresponded to spatial differences in isotope estimates. Using biplots of trophic versus ᵟ13C, I show how seasonal …
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Spatial Analysis of Fatal Automobile Crashes in Nashville, TN, 2001-2011
… fatal crashes, most of which focuses on non-spatial factors such as a driver’s visibility at night, drinking and drug use, and road conditions. These studies provide a theoretical basis for understanding the causes of crashes from a non-spatial perspective, and a number of traffic laws and …
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Spatial Variation of Cardiac Restitution and the Onset of Alternans
… does not flow. It is generally believed that the spatial scale for boundary effects is approximately equal to the passive length constant, lambda, of the tissue, the distance over which a a voltage pulse decays when it is below the threshold for wave generation. From the results of <em>in …
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Investigating the effects of impermeant anions on the electrical and computational properties on neurons
… cable properties, and synaptic integration. Spatial differences in the average charge of impermeant anions result in a nonisopotential dendrite with ionic microdomains. At steady state local discrepancies in membrane potentials and ion concentrations do not impact the passive or active …
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Placing Psychology: A Psychometric and Econometric Approach to Understanding Spatial Variation in Personality and its Consequential Outcomes
… the composition, causes and consequences of spatial variation in personality. The research presented in this thesis aims to better understand our behaviour by adopting a lens that incorporates information on who we are and where we are. After giving a general introduction in Chapter 1, I will …
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Biological Iron Limitation within Lake Superior's Watershed: Oligotrophic Algal Blooms Along a Land to Lake Gradient
… whole water were performed to measure growth differences among sites, times, and treatments with concurrent, environmental, elemental characterization. Results revealed that algal communities experienced iron limitation, once phosphorus was added, at least once in every site, irrespective of …
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Identifying structural differences in mixed mesophytic and northern hardwood forests on the Monongahela National Forest using remote sensing data
… the structural diversity, texture, spectral and spatial differences between forest stands of three age classes (50--69, 70--89, and >90 years) in the Cheat District on the Monongahela National Forest. The structural diversity was determined with foliage-height profiles for 48 stands ranging from …
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The lazy root : Will a change in the rainfall regime or increased anthropogenic nitrogen result in an alteration in the competitive balance between trees and grassed in a semi-arid South Africa savanna?
… grasses have differential access to water due to spatial differences in their rooting profiles. Subsequent studies in various savannas around the world have found that this is often not the case. In the central region of the Kruger National Park February & Higgins (2010) found that trees and …
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Microbial risk assessment for recreational use of the Kallang Basin, Singapore
… the Kallang Basin to analyze any diurnal or spatial differences in probabilities of illness, and establish guideline geometric mean concentrations. Samples were collected at four different locations along the Kallang Basin every four hours during a 48-hour period. Samples were then analyzed …
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Epikarst control on flow and storage at James Cave, VA: an analog for water resource characterization in Shenandoah Valley karst
… at two of the drip sites that may reveal spatial differences in storage capacity and retention time. Results of this work are intended to aid karst aquifer management by providing a multitechnique approach that can be used to assess seasonal patterns of recharge, quantify flowpath and …
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Metabolomic approaches to understanding the auxin and ethylene response in Arabidopsis roots
… mass spectrometry. This method uncovered spatial differences in metabolic profiles that were masked in analyses of whole roots or seedlings, and verified that flavonols increase in response to these hormones in root tips.
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Time-of-Flight Secondary Ion Mass Spectrometry Analysis of Microbial Induced Corrosion of Glasses
… surface and interface compositional and spatial differences, and identify microbial induced corrosion products across the glass surface after long term growth. Finally, a utilization of femtosecond laser ablation in combination with ToF-SIMS is presented for removal of biofilm layers to …
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Princess Vlei : what diatoms can tell us about spatial and temporal heterogeneity in an urban wetland
… project attempts to establish whether there are spatial patterns in diatom flora within a small lake. Diatoms from three depths from each of the four sites were identified, counted and analyzed according to their trophic preferences and pollution tolerances which were acquired from a variety of …
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Adult demography and larval processes in coastal benthic populations intertidal barnacles in Southern California and Baja California
… (0.1-1 km) in nearshore waters. Observations on spatial variability of adult barnacle demography were gathered over 1.5 years at scales of hundreds of kilometers. Stage-specific horizontal distributions and nearshore current measurements suggested that larvae of Balanus glandula and Chthamalus …
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Identification and Screening of Biomarkers of Human Exposure to Environmental and Food Toxicants in Sewage
… account the dilution of urine in wastewater. Spatial differences were observed on pesticide exposure in Italy and Europe and seasonal variations in human intake of pyrethroids were found, as expected, with higher intakes during spring/summer. Mass loads profiles of pesticides metabolites in …
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Differences In Urban and Rural Natural Hazard Mortality In the United States
… fatalities, there is little understanding of spatial differences in mortality between urban and rural environments.</p> <p>Hazard mortality data, found in multiple databases, are inconsistent. The collection and reporting of data lacks consistent standards and it is impossible to determine the …
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The Ecology and Behaviour of the Common hippopotamus, Hippopotamus amphibious L. in Katavi National Park, Tanzania: Responses to Varying Water Resources
… through the dry season. Hippopotami showed spatial differences in their activity budgets and the frequency of behavioural events at these sites, which were consistent with the way they responded to variation in water availability between seasons. Extrapolating these findings to predict …
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Understanding the development, evolution, and function of bullseye pigmentation patterns in Hibiscus trionum
… functions. These petal patterns are created by spatial differences in pigmentation, cell shape and texture of the adaxial petal epidermis. The mechanisms controlling formation and evolution of these patterns, and their exact role in plant-animal communication are not well understood. My PhD adds …
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Mountains, cities, random forests: new and old frontiers in geographical psychology
… the causes and consequences of geo- graphical differences in personality. After an initial introduction to the field and a broad over- view of the relevant literature (Chapter 1), I present an applied tutorial, that describes the typical analytical process when addressing psychological research …
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