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 699 for “"water-column"”.
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Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
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Transformations of carotenoids in the oceanic water column
… transform carotenoid pigments in the oceanic water column were studied. Suspended particulate matter collected from surface waters of Buzzards Bay, Massachusetts and the Peru upwelling system has a carotenoid distribution reflecting the phytoplanktonic source of the material. The carotenoid …
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Transformations of carotenoids in the oceanic water column
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982.
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Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
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Behavioral responses of invertebrate larvae to water column cues
… larval behavior mediating transport in the water column. Larvae in the plankton encounter a variety of physical, chemical, and biological cues, and their behavioral responses to these cues may directly impact transport, survival, settlement, and successful recruitment. In this thesis, I …
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Modelling and control of a floating oscillating water column
… of a Bent Backwards Duct Buoy (BBDB) Oscillating Water Column (OWC) Wave Energy Converter was created based on existing isolated numerical models of the different energy conversion systems utilised by an OWC. The novel aspect of this numerical model is that it incorporates the interdependencies of …
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Behavioral responses of invertebrate larvae to water column cues
… larval behavior mediating transport in the water column. Larvae in the plankton encounter a variety of physical, chemical, and biological cues, and their behavioral responses to these cues may directly impact transport, survival, settlement, and successful recruitment. In this thesis, I …
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Measuring and modelling estuarine macroalgae blooms and water column nutrients
… Based on long-term monitoring datasets of water column nutrients, temperature and irradiance, the Ulva tissue nitrogen concentration is modelled using an algebraic short-term equilibrium solution to a classic set of ordinary differential equations describing tissue nutrient dynamics. A …
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Power extraction from an oscillating water column along a coast
… here the specific case where an Oscillating Water Column (OWC) is attached to the tip of a long breakwater. A three-dimensional numerical model of a skeletal geometry of the the Foz do Douro breakwater is developed in order to determine the response inside the OWC pneumatic chamber to …
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Water Column Productivity, Calcite Precipitation, and Phosphorus Dynamics in Freshwater Marshes
… can cause significant diurnal changes in water chemistry, and can increase pH enough to cause precipitation of calcium carbonate minerals. During the precipitation of calcite (CaCO3) other chemical species such as phosphorus (P) can sorb onto the newly forming crystals and thus be removed …
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Experimental and Numerical Modelling of a Multiple Oscillating Water Column Structure
… and wind energy, using an array of oscillating water columns (OWC) and conventional wind energy technology. The focus of this thesis is on the wave energy-capturing aspects of the proposed platform. A 1:50, physical scale model of the proposed platform is described, and a tank testing programme …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
… pathways of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also identified. …
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Measurement of gas bubbles in a vertical water column using optical tomography.
… to a tomographic imaging system for use with gas/water mixtures. Several sensing techniques for measurement of two component flow using non-intrusive techniques are discussed and their relevance to tomographic applications considered. Optical systems are shown to be worthy of investigation. The …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Water Column Ammonium Concentration and Salinity Influence Nitrogen Uptake and Growth of Spartina Alterniflora
… of inorganic nitrogen before it reaches coastal waters, thereby reducing the potential for eutrophication. Although nitrogen availability typically limits <em>S. alterniflora </em>growth, it may be possible to exceed the nitrogen uptake capacity of <em>S. alterniflora. </em>Increasing either …
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Performance and power smoothing of innovative closed-circuit oscillating water column wave energy converter
… affordable electrical energy. Oscillating-Water-Column (OWC) devices are among the most promising types of wave energy converters because of their relative simplicity. The present work investigates the possibility of improving the performance of this well-established concept by introducing …
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Impacts of short-time scale water column variability on broadband high-frequency acoustic wave propagation
… and all processes occurring within using underwater acoustics. Acoustical sensing techniques allows for the measurement of ocean processes from within that logistically or financially preclude traditional in-situ measurements. Acoustic signals propagate as pressure wavefronts from a source to a …
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Effects of Water Column P-availability and Litter Microbial Mediated Processes and Stoichiometry in Aquatic Systems
<p>Anthropogenic nutrient enrichment of aquatic ecosystems is prevalent and can have detrimental effects on biological condition. Many of these effects have been attributed directly or indirectly to changes in autotrophic processes. However, in detrital-based streams changes in course detrital …
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A Novel Synergy: Integrating Oscillating Water Column Wave Energy Converters with Floating Wind Turbines ¿ Experimental and Numerical Investigations
L'abstract è presente nell'allegato / the abstract is in the attachment
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