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 36 for “"Temporal and spatial variations"”.
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Determining the temporal and spatial variations of pollutants in Toronto
This thesis aims to assess the spatial and temporal variations of pollutants in Toronto. Annual, seasonal, and monthly pollutant trends were computed from as early as 1974 to as late as the end of 2022. Decreasing NO, NO2, NOx and CO trends were found, perhaps associated with the elimination of …
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Modeling temporal and spatial variations in dissolved oxygen in Amite River
… is developed in this dissertation for simulating temporal and spatial variations in DO in lowland rivers with organic-rich fine-grained sediment. The modeling framework is based on three major contributions/new models, including (1)VART-DO model for improved estimation of reaeration coefficient …
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Improved leaf area index estimation by considering both temporal and spatial variations
Variations in Leaf Area Index (LAI) can greatly alter output values and patterns of various models that deal with energy flux exchange between the land surface and the atmosphere. Customarily, such models are initiated by LAI estimated from satellite-level Vegetation Indices (VIs) including …
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Temporal and spatial variations of hydraulic conductivity in a stream bed in Golden, Colorado
Includes bibliographical references.
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TEMPORAL AND SPATIAL VARIATIONS IN THE GEOCHEMISTRY AND MINERAOLOGY OF THE YOUNGER HISTORIC LAVAS OF MOUNT ETNA, SICILY
… been extensively sampled. Whole-rock chemical and petrographic data reveal a significant spatial variation within each of the lava fields studied and a uniform temporal variation in the succession of lavas. Spatial variations in lava composition within individual flow fields are related to …
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Local marine wastewater discharges : characterisation and impacts
… major sewage pumping stations in the Maltese Islands were sampled three times daily over a 7-day period in August-September 2002 so as to identify levels of suspended matter, nutrients (nitrates, nitrites, orthophosphates and total phosphorus), and biodegradable organic matter (measured …
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Systems analysis of runoff and sediment yield from a watershed using a simulation model
… model that will simulate runoff, sediment yield, and channel characteristics such as bed material or cross section changes, from complex, ungaged watersheds containing various crops, soil types, slopes, channel sizes, levels of conservation management and, instream erosion control structures for …
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Integrated Sustainability Assessment Framework for the U.S. Transportation
… impacts of alternative vehicle technologies and develop comprehensive sustainability assessment frameworks to analyze potential impacts of these vehicles in the U.S. In order to assess sustainability impact of vehicle alternatives, life-cycle based models has been extensively used in the …
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Representation learning of natural language and its application to language understanding and generation
How to properly represent language is a crucial and fundamental problem in Natural Language Processing (NLP). Language representation learning aims to encode rich information such as the syntax and semantics of the language into dense vectors. It facilitates the modeling, manipulation and analysis …
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Stable isotope hydrology of the Table Mountain group
… same time as samples from rivers, springs, seeps and boreholes, totalling 435 samples. Precipitation ranged from -75 ‰ to +40 ‰ for δD and -12 ‰ to +8 ‰ for δ¹⁸O , showing seasonal patterns, with lower δ values in winter and higher in summer. Certain anomalous δ values can be attributed to …
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Remote three-dimensional temperature sensing using planar laser induced fluorescence : development and applications to microwave heated liquids
… by difficulties in measuring temperatures and temperature distributions during the microwave heating process. This thesis describes the development of a 3D imaging fluorescence thermometry system that was used to examine temporal and spatial variations in temperature within various aqueous …
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Remote sensing to characterise vegetation fuel moisture content in the UK uplands
… hazard globally as they lead to significant land degradation, carbon losses and impact on human activities. Recent research has demonstrated how dynamic fire risk estimates can be informed by the use of remote sensing technology. The focus here is on improving methods for fire risk evaluation, …
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Dynamics and utilization of surf zone habitats by fish in the South-Western Cape, South Africa
… beach seine netting, the composition, abundance and size structure of fish assemblages frequenting surf-zone habitats in the south-western Cape, South Africa, to investigate temporal and spatial variations in these assemblages in relation to physical environmental parameters, and to assess the …
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Water management in hydraulic fracturing-a planning and decision optimization platform
… of wastewater. This polluted stream of water and the overall inefficient use of water in the hydraulic fracturing process has resulted in a number of negative environmental consequences, specifically surrounding ground and surface water quality and quantity. In considering how to minimize the …
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Molecular biology approach to anaerobic digestion of marine biomass: Anaerobic digestion from marine materials. What makes a methanogen happy?
… hydrolysable sugars, low amounts of cellulose and zero lignin enhances the suitability of seaweed for methane production, but this process has so far received little attention. As seaweeds have been shown to contain constituents with antimicrobial properties, understanding the microbial …
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Evaluation of environmental carrying capacity and application of the sustainability target method
… stressful burdens imparted at various scales and locations, that is, to accommodate the ecological stresses without showing permanent damage. The CC can be used as a reference dataset for Life Cycle Assessment (LCA) purposes and as a baseline for other environmental studies. In this research, …
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Organism -sediment interactions: The role of seabed dynamics in structuring the mesohaline York River macrobenthic community
… interface is influenced by sources and rates of sediment delivery and physical reworking of sediments by currents, tides, waves and biology, but effects of disruption of this interface on benthic biology are poorly resolved. For this study, I investigated effects of prevalent …
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Impact of Isotopic Heterogeneity in Shallow Systems on Modeling of Stormflow Generation
A major uncertainty in hydrologic and geochemical modeling of stormflow generation in watersheds has been quantification of the contributions of water and solutes from different sources and hydrologic pathways to streamwater. Isotopic techniques have recently gained widespread acceptance as useful …
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Fine-grained Adaptivity for Dynamic On-chip Networks
… for their increasing communication demands. Networks-on-Chip (NoCs) offer a scalable, high-bandwidth, low-latency solution to this problem, but unfortunately incur significant area and power overheads. Current NoCs are mostly agnostic to application requirements and hence are statically …
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Hydrogeologic Characterization of a discharge wetland in northeastern Grand Forks County, North Dakota
… discharge occurs in a belt of ephemeral wetlands in the lake plain. The physical and chemical hydrology of .the Lunby-stewart saline discharge wetland were investigated in order to provide information which could facilitate land management strategies applicable to this and other discharge …
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