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.
Results
Showing 1 to 14 of 14 for “"Carbon production"”.
-
Modeling the Effects of Physical and Biogeochemical Processes on Phytoplankton Species and Carbon Production in the Equatorial Pacific Ocean
… of the annual biomass and 69% of the primary production and export. Filtering out low frequency physical forcing results in a 30% increase in primary production and dominance of high-light adapted <em>Prochlorococcus</em> and autotrophic eukaryotes. Sensitivity studies show that iron …
-
Conversion of Switchgrass into Functional Carbon Materials and Food Emulsifiers
… increasing attention as a feedstock for biofuel production. However, the process is limited due to the high-cost and immature technologies. Therefore, the overall goal of this study is to convert switchgrass into high-value and large-volume commodity products, such as hard carbon and natural …
-
Alkyl Polyglucoside Compound Influences Freshwater Plankton Community Structure in Floating Mesocosms
… resulting in decreased autochthonous carbon production. Changes in the zooplankton community likely resulted from differential sensitivity among zooplankton to APG. The decrease in zooplankton abundance was primarily due to loss of copepods and a subsequent shift toward domination by …
-
Nanoporous carbon from corn cobs and its application
… or potassium hydroxide can lead to nanoporous carbon having surface area in excess of 3800 m²/g and pore volume of 2.5cc/g. Dried, crushed, corn cobs were carbonized at temperatures between 450- 900⁰C and chemically activated using H₃PO₄ and KOH. The effect of different variables of activation …
-
A comparison of ground source heat pumps and micro-combined heat and power as residential greenhouse gas reduction strategies
… regional data associated with electric power production and climate variations. The results show that indeed regional variations exist in the relative merits of micro-CHP systems and ground source heat pumps on reducing the carbon emissions for households. Specific results are sensitive to the …
-
Evaluating subalpine lake delta carbon storage in the Colorado Front Range and Washington Central Cascades
… contributors to the terrestrial organic carbon (OC) sink that affect global climate through the regulation of carbon-based greenhouse gases. However, mountain OC dynamics are poorly quantified. I sought to explore OC storage in subalpine lake deltas in the Washington Central Cascades and …
-
Historical growth rates and changing climatic sensitivity of boreal conifers
… of the growth rate of trees in terms of the carbon production by unit foliage, is the rationale that underlies this work and leads to the use of a multiplicative model for processing individual tree and chronology indices. The presence of a “common signal” in series of tree measures can lead …
-
Tracking carbon fluxes across ocean interfaces using dissolved gas observations
The cycling and exchange of carbon between Earth’s systems play a pivotal role in regulating climate, yet two major carbon fluxes remain poorly constrained: the biological carbon pump (BCP) and carbon release from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of …
-
The Comparative Study between the Adsorptive Capacity of Activated Carbon Obtained from the Enhanced Hydrothermal Polymerization Process with Conventional Activated Carbons in the Removal of Micropollutants of Concern
… adsorbents used towards adsorption is activated carbon. However, due to the high cost of the conventional commercial activated carbon (produced from coal, which is a finite resource), it is important to find alternative precursors that are readily available, low cost, and can potentially produce …
-
Tracking carbon fluxes across ocean interfaces using dissolved gas observations
The cycling and exchange of carbon between Earth’s systems play a pivotal role in regulating climate, yet two major carbon fluxes remain poorly constrained: the biological carbon pump (BCP) and carbon release from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of …
-
Measurement and characterization of low volatility organic compounds in the atmosphere
… to investigate the primary emissions as well as production and evolution of IVOCs in a series of experiments described in this thesis. Primary emissions of IVOCs have been previously measured in vehicle exhaust and have been theorized as a significant precursor to secondary organic aerosol (SOA) …
-
The formation of carbon nanofibers and thin films from the catalytic decomposition of ethylene by palladium
… catalyst toward the deposition of solid carbon from ethylene in two distinct forms: nanofibers and thin films. Four forms of palladium were tested: sputtered film, foil, sub-micron powder, and nanopowder. The deposition of carbon can be achieved by a very simple method. In this method …
-
The Oceanography and Modelling of the Pontevedra Ria (NW Spain)
… biogeochemical characteristics. Net community production (NCP) based on phosphate uptake was spatially and temporally variable, with rates of 9.6 and 20.2 mg C m ˉ² h ˉ¹ in central and internal rias in spring, respectively, and 30.3 and 29.0 mg C m ˉ² h ˉ¹ in the dry season. Previously …
-
Plankton dynamics of the open Southern Ocean and surrounding the (Sub)Antarctic islands
… they fix dissolved atmospheric CO2 into organic carbon biomass, much of which supports the ocean food web and a portion of which sinks into the ocean interior, thereby removing atmospheric CO2 on decadal to centennial timescales (i.e., the biological carbon pump). The importance of plankton …