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 47 for “"spatial trends"”.
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Recent spatial trends in post-Fordist Cape Town
Word processed copy. Includes bibliographical references.
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Spatial trends in surface-based carbonaceous aerosol measurements during DISCOVER-AQ in Houston, TX.
… in understanding urban air quality. Tracking spatial distributions of EC and WSOC is relevant to understand exposure and potential health impacts of PM₂.₅ to Houston.
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Spatial Trends of Non-Point Pollutants in Bottom Sediment of Lake Springfield, Southwest Missouri
Sediment quality trends can be used to identify pollution sources in lake and river systems. This study evaluates the spatial distribution of phosphorus, lead, zinc, copper, and calcium concentrations in bottom sediments of Lake Springfield to identify sources of non-point pollutants. With the …
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Temporal and Spatial Trends of the Amphibians, Reptiles, and Mammals of the Relict Ottine Wetlands
Ecological surveys are a snapshot in time, providing biological inventories and important documentation about ecological communities. If carefully documented these data may be used to estimate population sizes and demographics as well as community parameters such as abundance, species richness and …
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The Spatial Trends of Japanese Beetles in Illinois Soybean Fields and Their Effects on Sampling and Production
… Glycine max (L.) Merr., fields to determine the spatial trends of Japanese beetles, Popillia japonica Newman, and to measure their impact on soybean production. Commercial soybean fields were sampled intensively or extensively. Densities and distributions of Japanese beetles within fields were …
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Spatial precipitation trends and effects of climate change on the Hawai'ian Hualalai aquifer
While trends in temperature are well studied and understood spatially and temporally at a multitude of scales, trends in precipitation are less understood. As the predominant source of groundwater recharge in Western Hawai'i, precipitation plays a vital role in maintaining tourism and industry …
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Water quality trends in the Eerste River, Western Cape, 1990 - 2005
… of this study was to investigatge temporal and spatial trends in the water quality of the Eerste River between 1990 and 2005. The study results revealed that the major trends in the water quality of the Eerste River are more spatial than temporal.
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Investigating the Spatiotemporal Variation in Functional Markers, Gut Metabolites and Ethanol Toxicity in In Vitro Cultures of the Rat Jejunum and Hepatocytes
… function in the jejunum followed in vivo – like spatial trends reported for the entire small intestine. Jejunum explants were integrated with hepatocytes to model the intestine-liver axis. Integration of jejunum explants from the proximal region with hepatocytes had a beneficial effect on both …
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An investigation into the geographical trends in the sectoral composition of the Cape Town economy
… of this research is to examine the geographical trends in the sectoral composition of the city of Cape Town economy between the year 2000 and 2005. The research is informed by related studies and theories that argued Cape Town is developing a post-Fordist spatial order characterised by the …
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The influence of spatiotemporal variation in food web models
… studies continue to use temporally static and spatially homogenous representations of food webs. This thesis proposes that a detailed investigation of temporal and spatial trends in a large lake ecosystem can improve our understanding of the mechanisms and drivers of spatial and temporal …
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The communication of profile perspective maps: a perceptual study
… of displaying comparatively simple models of spatial information. The elements of design used to portray profiles are hypothesized to influence map perception. Two of these variables: profile type and rotation are selected for study. Map data are represented in profile maps as a series of …
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Approaches to the spatial modelling of cancer incidence and mortality in metropolitan Perth, Western Australia, 1990 -2005
… was used to undertake the analysis on the spatial distribution of cancer rates per 100,000 person-years for Perth Statistical Local Areas during the period 1990-2005. This analysis is based on age-adjusted and age-sex-adjusted rates (non-sex specific cancers only). For lung, colorectal and …
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Temporal and longitudinal extent of surface coal mining influences on water quality and benthic macroinvertebrate communities in central Appalachian headwater streams
… Appalachian region. However, temporal and spatial trends of water quality and associated influences on biota in these stream systems have not been well-studied. To address this research need, I analyzed temporal trends in specific conductance, ion matrix, and benthic macroinvertebrate …
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CHANGES IN THE MORPHOLOGY OF WIDGEON GRASS (RUPPIA MARITIMA) WITH THE ONSET OF REPRODUCTION AND IMPACTS ON FISH ASSEMBLAGES AT THE CHANDELEUR ISLANDS, LA
… Islands, LA were sampled to describe the spatial distribution and morphology of reproductive plants<em> </em>and investigate<em> </em>habitat use by fish assemblages. We assessed spatial trends in <em>R. maritima </em>presence and occurrence of reproduction and evaluated differences in …
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A Spatial and Multivariate Approach to Examining Effects of Urbanization on Nitrogen Sources, Organic Matter Inputs, and Trophic Structure in Streams of Cobb and Paulding Counties, Georgia.
… and carbon sources are altered with the use of spatial trends of δ<sup>15</sup>N values in streams with varying levels of urbanization; (2) to examine how the effects of urbanization, altered nitrogen and organic matter inputs play a role in trophic structure within aquatic ecosystems by …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to explore late Quaternary climate variability and connections between past climate change and terrestrial …
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Post-Wildfire Debris Flow Susceptibility and Preconditioning Factors in the Central Okanagan
… properties governing their magnitudes and spatial distributions. These physical properties were used to create a Random Forest model to determine predictive variables associated with debris flow initiation. Key predictive variables include cross-sectional curvature, basin Melton ratio, …
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Floristic quality assessment of grassy slough preserve in Johnson County, Illinois
… of this study was to record any detectable spatial trends in non-native, invasive species colonization. A total of 153 vascular plant species in 57 families were observed during the growing seasons of 2001 and 2002. The largest family was Asteraceae with 28 species, followed by Poaceae with …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to explore late Quaternary climate variability and connections between past climate change and terrestrial …
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Applications of Sensory Analysis for Water Quality Assessment
… were applied to look for underlying factors, spatial or temporal trends in the data. There were no reported TandO events during the project but sensory analysis, Flavor Profile Analysis, characterized earthy/musty odors present. No temporal or spatial trends of odors were observed. Seven …
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