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 33 for “"depth distribution"”.
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Distribution of the Percent Aluminum Saturation in Soils on the Burlington and Elsey-Reeds Spring Geologic Formations in Northern Stone County, Missouri
… These soils were studies to determine the depth, distribution and the correlation of percent clay, percent organic matter, extractable calcium and pH with percent aluminum saturation for planning purposes. Most of the soils studies had a moderate to very high potential for aluminum …
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The Geochemistry of Selenium and Sulfur in a Coastal Salt Marsh
… large seasonal changes in concentration and distribution with depth, indicating a coupling with redox conditions. In contrast, the depth distribution of greigite did not show appreciable changes with season. Pyrite underwent large concentration changes in the upper 15 cm of sediment during …
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Seasonal and Mesoscale Variability in the Distribution of Antarctic Krill, <i>Euphausia superba</i>, West of the Antarctic Peninsula
… of seasonal and mesoscale variability in the distribution and abundance of Antarctic krill, Euphausia superba, within continental shelf waters west of the Antarctic Peninsula and to investigate possible relationships between variability in krill distributions and variability in selected …
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ΜΕΛΕΤΗ ΤΗΣ ΚΑΤΑΝΟΜΗΣ ΥΔΡΟΓΟΝΟΥ ΣΕ ΛΕΠΤΑ ΥΜΕΝΙΑ ΔΥΟ ΣΤΡΩΜΑΤΩΝ ΔΙΑΦΟΡΕΤΙΚΩΝ ΜΕΤΑΛΛΩΝ
… EMPLOYED FOR THE DETERMINATION OF THE HYDROGEN DEPTH DISTRIBUTION IN SOME THIN FILMS OF METAL-HYDROGEN SYSTEMS ONTO A STAINLESS STEEL SUBSTRATE. THE INVESTIGATED FILMS WERE: THE SINGLE LAYER FILMS V-H AND TI-H AND THE THIN FILMS SANDWICHES (FILMS CONSISTING OF TWO THIN LAYERS OF DIFFERENT …
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Studies of the foods and feeding ecology of wading birds.
… and pellet analysis and direct observation. The distributions of invertebrates, and especially those of major importance as wader food, are described as well as the factors affecting these distributions. Variations in density of prey in relation to O. D., general geography of the estuary, and …
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Nanostructure formation on Germanium by ion irradiation
… Ge1-xSnx nanostructures and following the depth distribution of the impinging ions. Furthermore, ion implantation through ultra-thin (10-20 nm) films of silicon nitride (SiNx) was investigated as a possible way to impact on nanovoid formation kinetics, prevent ambient contaminations and …
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Relocation study of Virginia earthquakes (1959-1981) using the Joint Hypocenter Determination and Joint Epicenter Determination methods
… and comparably small changes in focal depths. Geometrically, they can be grouped into three planes and one cluster of events. The majority (17/25) of the events are contained in two of the planes, both of which have an ENE trend and a 45° southerly dip. The JED/SE77 results: 1) indicate …
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Trace elements in marine biogenic carbonates: analysis and application to past ocean chemistry
… comes from uncertainty in estimation of the<br/>depth distribution and seasons of calcification of planktonic foraminifera.
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Benthic Community Responses to Hypoxic Conditions in the Lower Rappahannock River, Virginia
… August, and September 1993 at five equidistant depths (5, 10, 15, 20, and 25 m) extending upwards from the deepwater Virginia Benthic Biological Monitoring Station LE3.4 located in the deep basin just inside the mouth of the Rappahannock River. Infaunal species diversity, richness, biomass, and …
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A Theoretical Approach To Assessing Annual Energy Balance In Gray Whales (eschrichtius Robustus)
… extent of their feeding season, and blubber depth distribution) using morphometric data, energetic costs, and food assimilation according to age and gender specific requirements. Food intake rates for gray whales of varying maturity and gender were then estimated based on FMR and caloric …
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The Biogeochemistry of Hydrogen Sulfide in the Open Ocean
… highest, in the mixed layer and decreased with depth. The depth distribution and the rate of carbonyl sulfide (OCS) hydrolysis to hydrogen sulfide under oceanographic condition were determined because of their importance for the cycling of dissolved sulfide. Depth profiles of OCS show …
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Iceberg-keel ploughmarks on the seafloor of Antarctic continental shelves and the North Falkland Basin: implications for palaeo-glaciology
… of past and present iceberg morphology, keel depth and drift direction has seldom been approached in the southern hemisphere. Using high-resolution multi-beam swath bathymetry of the mid-shelf Pine Island Trough and outermost Weddell Sea shelf regions of Antarctica, detailed analysis of …
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Diversity and abundance of sharks in no-take and fished sites in the marine protected area network of Raja Ampat, West Papua, Indonesia, using baited remote underwater video (BRUVs)
… in no-take and fished sites, across a 3 to 80 m depth gradient. Overall, nine species of sharks from five families were recorded; Carcharhinus melanopterus was the most abundant species. PERMANOVA analysis showed no statistical difference between areas nor zoning status; likely due to the …
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Quantitative approaches and applications to the sequence stratigraphy and biodiversity of Pleistocene – Holocene mollusk communities from the Po plain, Italy and San Salvador Island, the Bahamas
… models. The last chapter also explores water depth distribution for selected taxa recorded in the Quaternary sediments and observed in present-day habitats. The dissertation research explored here demonstrates that modern ecological systems are essential to evaluating past geologic events. …
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Development of proxy seawater records from gorgonian coral skeletons
… the world’s oceans from the shallows to great depths, and with banded skeletons formed of organic gorgonin and calcite, the possibility exists to measure previously unobtainable proxy records. This Ph.D. focuses on the development of new methods for extracting proxy information from gorgonian …
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Spatial Patterns of Mercury in Atmospheric Deposition, Soils and Lake Biota in the Adirondack Park, New York
… Hg concentrations appear to be shaped by the depth distribution of soil organic matter. Mercury concentrations in lake biota increased with increasing position in the food chain. Methyl Hg concentrations in top predators are set by the base of the food chain and strongly increase with decrease …
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Migration of an intruder particle in a boundary driven shear flow
… properties of this flow are characterized by the depth profile of granular temperature, mean velocity and granular pressure which are related to the wall roughness, shear gap height and particle inelasticity measured by a constant normal restitution coefficient. By means of autocorrelation and …
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The Mechanics of Active Faulting and Mountain Building
… from across the Andes, using the earthquake depth distribution and slip vectors to infer that buoyancy forces are important in controlling the pattern of deformation. Calculations of the buoyancy forces indicate that faults cutting through the foreland support forces ~4-8 TN/m and have …
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Reproduction and larval biology of North Atlantic asteroids related to the invasion of the deep sea
… the reproductive adaptations are a function of depth, distribution or are phylogenetically controlled, and 2) to conduct experiments on the effects of pressure and temperature on larval development of Atlantic asteroids, to investigate the physiological potential for deep sea invasion by …
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