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 189 for “"TDS"”.
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The Comprehensive Study of High Viscosity Friction Reducers in High-TDS and High-Temperature Environments
… low to medium level of Total Dissolved Solids (TDS) but show a significant drop at high TDS conditions in term of their friction reduction performance in most cases. On the contrary, cationic friction reducers are believed to have better TDS tolerance and friction reduction performance under …
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Political Satire and Political News: Entertaining, Accidentally Reporting or Both? The Case of The Daily Show with Jon Stewart (TDS)
… last decade, The Daily Show with Jon Stewart (TDS), a (Comedy Central) cable comedy show, has been increasingly seen as an informative, new, even revolutionary, form of journalism. A substantial body of literature appeared, adopting this view. On closer inspection, it became clear that this …
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Levels of Dissolved Solids Associated with Aquatic Life Effects in Headwater Streams of Virginia's Central Appalachian Coalfield Region
… distrubed streams. Total dissolved solids (TDS) associated with mining have been suggested as stressors to these communities. In studies of such streams conducted to date, both non-TDS stressors and elevated TDS have been present as potential influences on biota. Here the association between …
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Determining a Total Dissolved Solids Release Index from Overburden in Appalachian Coal Fields
… predict the release of total dissolved solids (TDS). High concentrations of TDS have been linked to a decrease in survival of aquatic macroinvertebrates. Our objective was to determine the effect of different solutions on overburden dissolution, and to develop a TDS release index. Forty-one …
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X-ray thermal diffuse scattering and its studies of lattice dynamics
… give rise to thermal diffuse scattering (TDS). TDS contain valuable information about lattice dynamics of the scattering material. Historically, x-ray TDS was the first tool utilized by people in experimental determination of phonon dispersion relations. With the advent of synchrotron …
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Vegetative Potential to Reduce Total Dissolved Solid Nutrient Ions Generated from Reclaimed Mine Lands in Central Appalachia
… is the impact of total dissolved solids (TDS) on water quality. To address this issue, this study assessed whether vegetation could reduce TDS nutrient ion movement from the rooting zone in early reclamation stages when TDS generation is often highest. Vegetated and un-vegetated paired …
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Structural Dynamics of Amorphous Solid-State Macromolecular Materials at Terahertz Frequencies
… of terahertz time-domain spectroscopy (THz-TDS) to study complex amorphous solid-state systems. THz-TDS is a vibrational optical spectroscopy technique which can probe the intermolecular librations and vibrations of materials. Previous work has explored the use of THz-TDS in probing …
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Hydrologic and hydrochemical processes on mine spoil fills
… in streams is called total dissolved solids (TDS) and streams with elevated TDS often have altered biota. The surficial, subsurface, and discharge properties of mine spoils influence TDS discharge concentrations. This study aimed to improve understanding of how hydrologic and hydrochemical …
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Field Indicators for the Prediction of Appalachian Soil and Bedrock Geochemistry
… Appalachians contributes total dissolved solids (TDS) to headwater streams, especially below larger mines and associated valley fills. My objective was to characterize the geochemical properties of a range of surface soils and associated geologic strata from the Central Appalachian coalfields and …
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An Ecotoxicological Evaluation of Active Coal Mining, Sedimentation and Acid Mine Drainage in Three Tributaries of the Leading Creek Watershed, Meigs County, Ohio
… concentrations of sodium (mean of 910 mg/L), TDS (mean of 3,470 mg/L), and periodic acute water column toxicity (mean C. dubia survival of 62% in 100% sample) were most likely responsible for the depressed benthic macroinvertebrate community observed in Parker Run. In ranking the severity of …
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An Ecotoxicological Assessment of a Treated Coal-mining Effluent in the Leading Creek Watershed, Meigs County, Ohio
… lotic ecosystems through total dissolved solids (TDS) toxicity, caused primarily by the reagents used for pH modifications and the oxidation of reduced sulfur. Such impairment was best detected through application of (1) benthic macroinvertebrate surveys using metrics of biotic impairment such as …
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Hydrogeologic Controls on Groundwater Quality in the West Mamprusi Area, Northern Ghana
… among the high total dissolved solids (TDS) outliers. Cluster analysis showed that samples from the same lithology do not necessarily have the same groundwater chemistry; the TDS of the samples were more distinctive than the geologic unit, though high-TDS samples were most likely in …
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A Regional Chemical Characterization and Analysis of Groundwater in Eastern Ontario
… in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and …
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Effect of Leaching Scale on Prediction of Total Dissolved Solids Release from Coal Mine Spoils and Refuse
… including elevated total dissolved solids (TDS) levels in receiving streams. Column leaching procedures are recommended by many studies for TDS prediction, but many question their applicability to field conditions. The objective of this study was to assess results from a simple column …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… limiting release of total dissolved solids (TDS) and associated elements of concern. Previous column studies utilized an unsaturated bi-weekly leaching design to evaluate the behavior of overburden with respect to TDS, pH, and trace metals. The objective of this study was to determine the …
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Characterizing and mitigating scattering effects in terahertz time domain spectroscopy measurements.
… in terahertz time-domain spectroscopy (THz-TDS) has progressed to such a great extent that terahertz is finding potential use in real world applications such as biomedical sensing, security screening and defence related applications. While many researchers and commercial organizations have …
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Investigating the Variations in Molecular Mobility within Amorphous Formulations using Terahertz Spectroscopy
… thesis, terahertz time-domain spectroscopy (THz-TDS) was used to probe variations in molecular mobility within different amorphous systems, with the aim of predicting physical stability based on these changes. The investigation began with a basic polymer-water binary system, representing the …
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Ultrafast Spin-Charge Conversion Schemes in Magnets: THz Time Domain Spectroscopy Study
… is Terahertz time domain spectroscopy (THz TDS). In this thesis, we use THz TDS to investigate the routes by which the spin ordering, spin dynamics, and spin currents can lead to the generation of ultrafast charge currents. We study a variety of magnetic systems to experimentally demonstrate …
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A Novel Temperature Control Method for Electrode Type Ohmic Water Heaters
… water temperature in solutions where the TDS is between 50 and 400 ppm. To heat water with TDS below 50 ppm, CO2 gas can be mixed with the water.</p>
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