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 95 for “"Anthropogenic sources"”.
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Three Hundred Year Record of Part Per Trillion (PPT)-level Perchlorate Measured with Ion Chromatography with Tandem Mass Spectrometry (IC - MS/MS)
… today likely comes from both natural and anthropogenic sources. To reduce the threat posed by environmental perchlorate, it is necessary to know the contribution from anthropogenic sources and that from natural sources. The contribution from natural sources can be estimated from …
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Exploring the value proposition of integrating back-up saline storage into anthropogenic CO₂ supplied EOR operations
… through carbon dioxide (CO₂) sequestration from anthropogenic sources has been gaining attention in policy circles. In particular, it is viewed as a potential way to help accelerate the deployment of carbon capture and sequestration (CCS) technologies. The interest in the EOR-CCS model stems from …
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Sorption of the platinum-group elements in selected solid matrices
… in environmental samples exposed to anthropogenic sources of PGE, but there are very few studies that have investigated sorption behaviour of PGE in soils.
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Tracing the Distribution of Heavy Metals in Sediments of the Pearl River Estuary
… are attributed to three separate heavy metal sources. After normalisation for the effects of the fine particle size affinity, the same spatial distribution patterns remain, but with much less localised variability. Anticlockwise estuarine circulation and the interaction of marine and river …
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Anthropogenic impacts on recharge processes and water quality in basin aquifers of the desert Southwest : a coupled field observation and modeling study
… recharge on basin floors, and no recharge from anthropogenic sources. However, in the Trans-Pecos, nitrate (NO₃-) concentrations have increased in basin groundwater (up by 3-4 mg/l as NO₃- in 40 yrs), refuting the “classic” model and posing water quality risks. Grazing and irrigated agriculture …
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Tracking nuclear generating station emissions and fossil fuel contributions using tree rings in southern Ontario, Canada
… indicator of the Anthropocene. Carbon from anthropogenic sources can be released to the atmosphere as radiocarbon (14C) from nuclear power and above-ground nuclear weapons testing. Carbon-12 and carbon-13 (12,13C) are derived from fossil fuel combustion in the urban, industrial, and …
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Photochemical oxidant air pollution : peroxyacetyl nitrate (PAN) as an indicator of photochemical activity
… These precursors are principally emitted by anthropogenic sources. As the major component of the photochemical oxidants is ozone, it is used as the indicator of photochemical smog and air quality standards today are therefore based on ozone. Another important photochemical oxidant is …
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An investigation of the primary sources of the Cape Town brown haze
… atmosphere, which can originate from natural or anthropogenic sources. The "Brown Haze" is a phenomenon that is associated with Cape Town and can be described as brown coloured smog. It occurs over the winter months, mainly May to September, due to the strong temperature inversions and windless …
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Distribution of Metals in Soils in Public Parks in South Calgary
… those in the southeast quadrant reflecting the anthropogenic sources of contamination in the southwest quadrant from increased industrial and transportation activities. High coefficient of variation for most metals, indicate wide spatial variations that may lead to local exceedances. The human …
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Hydrogeology and ground-water quality in the Sanders area, western Puerco River basin, Arizona
… radionuclide contamination from natural and/or anthropogenic sources. In addition to documented radioactive occurrences in the regional Chinle Formation, the headwaters of the Puerco River have been host to uranium mine waste discharge and spoils from a tailings pond failure in 1979. Samples …
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A Dietary Analysis on Panamanian Bat Species
… diet based on seasonal variance and eventually anthropogenic sources. Due to unforeseen problems with sampling technique, the results of this study were not significant. A larger data set and improved sterilization is needed to confirm any changes within species and between seasons.</p>
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Estimating source strengths and lifetime of Nitrogen Oxides from satellite data
… the atmosphere has changed significantly due to anthropogenic emissions. Nitrogen oxides (NO+NO2) play an important part, as they directly affect human health and environment, and are involved in chemical key reactions, leading to ozone production in the troposphere. Spectral measurements from …
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Study of factors around automotive fuel cell implementation and market acceptance
… is due to the emissions of greenhouse gases by anthropogenic sources, while others believe it is due primarily to natural phenomena, such as solar cycles. Regardless of the actual cause, we should be motivated to drastically reduce · emissions of these gases, improve fuel efficiency, and reduce …
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Characterization of Metal Concentrations in Sediment and Water of the Swan Creek Watershed, A Major Tributary in the Maumee River Area of Concern
… metals input and to evaluate the extent of anthropogenic inputs by calculating enrichment factors. Metals concentrations in water and sediment samples indicate they are not a concern for water quality and not a concern for sediment quality for all but the lowest six miles of Swan Creek and …
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Arsenic contamination study of drinking water in Nepal
… of the geology of the Terai region and potential anthropogenic sources is recommended to further characterize the area.
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Petroleum refining and air quality management
… five percent of the total emissions from all anthropogenic sources. A document containing a complete set of guidelines for use in the refining industry which satisfies the current and anticipated air quality legislations and regulations in the U.S. is necessary. In the past, several documents …
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Hormone analyses of Black-Footed Albatross (Phoebastria Nigripes) at Midway Atoll NWR and Tern Island, Hawaiian Islands NWR
… whose numbers are affected every year by anthropogenic impacts. Until now, no one has looked at the transfer of contaminants via soil to P. nigripes. However, studies have been done on how the Laysan albatross (P. immutabilis) is affected by lead in the soil (Work and Smith, 1996; …
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Spatial and temporal analysis of heavy metals in surface waters, bed sediments and suspended sediments of the River Stour, East Kent, U.K.
… source management measures and control non-point sources and dredging activities and provides an index in which to assess the future impact of anthropogenic sources of metals to the fluvial environment of the River Stour.
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Metal oxide sorbents for carbon dioxide capture prepared by ultrasonic spray pyrolysis
… The rising CO2 levels can be traced to anthropogenic sources, the majority of which comes from burning fossil fuels for power generation. As a result, research is underway to incorporate CO2 capture into power plants using the integrated gasification combined cycle (IGCC), which is a …
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An uncertainty-focused approach to modeling the atmospheric chemistry of persistent organic pollutants
… of burning and therefore have important anthropogenic sources in the combustion of fuels, biomass, etc. PFCAs and their atmospheric precursors are used in making firefighting foams, non-stick coatings, and other surfactant applications. I quantitatively examine the relative importance of …
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