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Showing 1 to 20 of 160 for “"marine sediments"”.
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Wave-induced liquefaction processes in marine sediments
… 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 that the liquefied soil behaves as a visco-elastic-plastic …
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AN INVESTIGATION OF SEISMIC ATTENUATION IN MARINE SEDIMENTS
… the attenuation properties of unconsolidated sediments using marine surface seismic data. Several methods of measuring attenuation were assessed for reliability in a noise-free case and with the addition of noise using a set of synthetically absorbed and dispersed wavelets. Wavelet modelling …
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Biogeochemistry of dissolved free amino acids in marine sediments
… in interstitial water samples squeezed from sediments collected in a variety of depositional environments. These sediments were further characterized by measurements of total organic carbon, total nitrogen, dissolved organic carbon, total hydrolyzable amino acids, and pore water-dissolved …
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The in situ compressional wave properties of marine sediments
… for determining the geotechnical properties of marine sediments. However, the relationships required to perform such an inversion are still under debate, with further research required to resolve the dependence of compressional wave properties on both frequency and geotechnical properties. …
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Biogeochemistry of dissolved free amino acids in marine sediments
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980.
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Coupled cycling of metals with nitrogen and carbon in marine sediments
… with the isotopic signatures of several marine nitrifying organisms. This suggests that “leakage” of intermediate hydroxylamine from nitrifier cells could potentially react with manganese(III) in a mixed biotic-abiotic process without previously being noticed. Finally, I performed …
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Distribution of Dehalococcoidia in marine sediments and strategies for their enrichment
The marine subsurface is one of the largest microbial habitats on Earth. Microbial community studies based on the 16S rRNA gene have revealed that bacteria of the class Dehalococcoidia, phylum Chloroflexi, are one of the most widespread and abundant bacteria inhabiting the marine subsurface. …
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Faunal, sedimentological and geochemical indicators of dysoxia in Cretaceous marine sediments
Cretaceous marine sediments worldwide are characterised by the occurrence of 'Oceanic Anoxic Events' during which organic matter was extensively deposited in 'black shale' facies. Although diverse criteria for the recognition of low oxygen levels have been described previously they have not been …
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Clay Mineralogy of Recent Marine Sediments in the Gulf of Mexico
Made available in DSpace on 2014-12-04T19:13:42Z (GMT). No. of bitstreams: 1 5805458.pdf: 5427945 bytes, checksum: 03e2ae14289d58e474d6f5ff6b94dd41 (MD5) Previous issue date: 1958
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Coupled cycling of metals with nitrogen and carbon in marine sediments
… with the isotopic signatures of several marine nitrifying organisms. This suggests that “leakage” of intermediate hydroxylamine from nitrifier cells could potentially react with manganese(III) in a mixed biotic-abiotic process without previously being noticed. Finally, I performed …
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Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation
… removed from the oceans only through burial with marine sediments. Organic phosphorus (Porg) constitutes an important fraction (ca. 25%) of total-P in marine sediments. However, given the inherent lability of primary Porg biochemicals, it is a puzzle that any Porg is preserved in marine sediments. …
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Isotopic constraints on the sources and associations of organic compounds in marine sediments
… and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different modes of association in aquatic sediments and soils. Radiocarbon is a sensitive tracer of OM provenance, with variations in its natural abundance …
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Developing an optical sensor for the visualisation of pH gradients in marine sediments
… important biogeochemical processes that occur in marine sediments are intimately linked to pH dependent processes, but surprisingly little is known about the details of the pH profiles generated. This is mainly due to the difficulty of obtaining samples and measuring representative profiles. Such …
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Isotopic constraints on the sources and associations of organic compounds in marine sediments
… and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different modes of association in aquatic sediments and soils. Radiocarbon is a sensitive tracer of OM provenance, with variations in its natural abundance …
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Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation
… removed from the oceans only through burial with marine sediments. Organic phosphorus (Prog) constitutes an important fraction (ca. 25%) of total-P in marine sediments. However, given the inherent lability of primary Prog biochemicals, it is a puzzle that any Porg is preserved in marine sediments. …
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