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 2197 for “"Sediments"”.
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Heavy metals in river sediments
Samples of sediment material were collected from the River Cynon. The concentrations of heavy metals in the samples were determined by Atomic Absorption Spectroscopy after digestion of the dried sample. A rapid hydrochloric acid/hydrogen peroxide digestion was chosen after a brief comparison with …
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Mixing Processes in Hyporheic Sediments
L'abstract è presente nell'allegato / the abstract is in the attachment
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Geochronology of salt-marsh sediments
<br/>Salt-marsh sediments can provide important achives of past sea levels if they can besecurely dated. This thesis investigates eight methods for dating salt-marsh sediments.These include traditional and established dating methods (¹⁴C dating and theradionuclides ¹³⁷Cs and ²¹ºPb) and more novel …
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Alteration of hydroxyhopanone in sediments
Includes bibliographical references.
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Thermomagnetic properties of red sediments.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. M.S.
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Phosphorus readsorption on Occoquan sediments
… extent of phosphorus readsorption on Occoquan sediments and the amount of subsequent removal because of settling of the particles with time. Occoquan sediments were placed in six polyurethane cylinders and submerged. In two separate experiments, the cylinders were driven anaerobic, which …
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Bioavailability of organic contaminants in sediments.
… hydrocarbons (PAHs) and chlorobiphenyls (CBs) in sediments is largely dependent on the freely dissolved concentration of these pollutants. However, measuring these is challenging, due to the low concentrations of lipophilic contaminants in the environment and their strong affinity for particles …
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Preliminary Study of Lake Agassiz Sediments
<p>The Agassiz sediments have been difficult to study because of their complex stratigraphy and homogeneous lithology. The mineral particle size distribution and the petrography of these sediments were the basis of a preliminary study which allowed a columnar section at Grand Forks to be divided …
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Sodium Transfer in Biofiltration Wetland Sediments
The model generally predicted the sediment sodium concentration consistent with the sodium measured in seasonal sediment samples. The model was especially sensitive to changes in sodium concentrations in the overlying water and was also sensitive to changes in both the sediment porosity and clay …
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Dispersion of fine sediments in tides
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Studies of trace elements in sediments
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1954.
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Transport of trace metals in nearshore sediments
… and within the sediment column of nearshore sediments. The early diagenesis of several first-row transition metals exhibiting a variety of behaviors in the ocean -- Mn, Fe, Co, Ni, and Cu -- has been studied intensively at a site in Buzzards Bay, Mass. By limiting the study to a single site, …
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Post-depositional structural changes in clay sediments
… deposition. The geotechnical properties of fresh sediments are considered and the ability of the depositional environment to affect these properties is assessed. From a SEM analysis of mudrocks it is shown that there is a correlation between microstructure and the conditions at the time of …
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Biogeochemistry of Metals in Fish Farm Sediments
… interactions, and effects of metals in farm sediments of Scottish sea lochs. <br/>Scottish sea lochs are fjordic systems, and have a defined set of physical processes occurring within them that depend on topographical characteristics of the sea loch and the influence of external forces. The …
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Iron inputs from sediments to the oceans
… the nature and ubiquity of iron (Fe) inputs from sediments to the<br/>oceans. In the last 10 years continental shelf sediments have become widely recognised<br/>as important vectors for dissolved Fe inputs to the oceans, where bacterial dissimilatory<br/>Fe-reduction (DIR) promotes the flux of Fe …
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Studies of sediments in a tidal environment
… samples, showed that the primary fabric of their sediments is controlled by modal sediment size, magnetic mineralogy and the type and intensity of the water currents. The effect of biogenic disturbances and the re-establishment of magnetic alignment under different depositionary controls are …
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SOME MAGNETIC PROPERTIES OF BORE CORE SEDIMENTS
The first eight chapters of this thesis describe a study of the magnetic effects of drilling on bore cores of sedimentary rocks. Extensive rock and palaeo- magnetic methods were used to investigate such effects in three collections of bore cores from the North Sea and Sellafield, U.K., and Prudhoe …
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Wave-induced liquefaction processes in marine sediments
An investigation for seabed liquefaction induced by progressive water waves is vital for the protection of marine structures from damage to the structure foundations. The residual liquefaction in sedimentary seabed has been found to be of progressive nature and experiments have also demonstrated …
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