Search for dissertations about: "in situ concentration measurements"
Showing result 6 - 10 of 74 swedish dissertations containing the words in situ concentration measurements.
-
6. Free-Vehicle Benthic Lander Technology for the Study of Biogeochemical Processes in Marine Sediments
Abstract : Various sediment sampling and incubation techniques were used to characterize benthic biogeochemical processes important for an improved understanding of the oceanic carbon cycle. Recent flux data from the Arctic Siberian shelf are revealing differences (often by a factor of ten) between areas affected by the big Russian river outlets (high fluxes) and areas with low influence from land (low fluxes). READ MORE
-
7. Methane dynamics in northern lakes : Insights from multi-scale observations
Abstract : Methane (CH4) is a potent greenhouse gas which is emitted to the atmosphere from both natural and anthropogenic sources. Current evidence indicates that lakes account for a large part of the global emissions of CH4, but their contribution is difficult to quantify because of large temporal and spatial variability in processes leading to CH4 fluxes from lakes to the atmosphere. READ MORE
-
8. In-situ activated hydrogen evolution from pH-neutral electrolytes
Abstract : The goal of this work was to better understand how molybdate and trivalent cations can be used as additives to pH neutral electrolytes to activate the Hydrogen Evolution Reaction (HER). Special emphasis was laid on the chlorate process and therefore also to some of the other effects that the additives may have in that particular process. READ MORE
-
9. Development and Application of Non-linear Mid-infrared Laser Spectroscopy for Combustion Diagnostics
Abstract : The work reported in this thesis involved the development and application of two novel infrared non-linear laser techniques, namely mid-infrared polarization spectroscopy (IRPS) and mid-infrared degenerate four-wave mixing (IR-DFWM) to combustion diagnostics. These two techniques meet the needs of species concentration detection in combustion environments, especially for those species lacking accessible electronic (one-photon) transitions in the ultraviolet (UV) or visible spectral region. READ MORE
-
10. Precipitation of Kraft Lignin from Aqueous Solutions
Abstract : One way of improving the materials yield of a kraft paper pulp process, and simultaneously providing the industry with aromatic macromolecular structures, is to extract lignin from the black liquor. This can be done by lowering the pH of the black liquor, which will result in the precipitation of the lignin. READ MORE