Avancerad sökning
Visar resultat 6 - 10 av 37 uppsatser som matchar ovanstående sökkriterier.
6. Improvement of Pt-based catalyst supported on CeZrO2 used for the high-temperature water-gas shift reaction
Master-uppsats, Lunds universitet/Kemiteknik (CI)Sammanfattning : The iron-chromium (Fe/Cr) catalyst is used for high-temperature water-gas shift (HT WGS) reaction. A major concern using the Fe/Cr catalyst is that it contains hexavalent chromium (Cr+6) which is a potent carcinogen causing health and environmental issues. LÄS MER
7. Utvärdering av Tväråns vattenkemi : Källor för metaller och organiska ämnen
Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : Tvärån is an urban stream close to the center of Umeå that serve as a recipient of contaminants from various industries. Therefore, the county administrative board (Länsstyrelsen) in Västerbotten were interested in a compilation of water chemistry data from earlier studies done in Tvärån. LÄS MER
8. Dynamics of streamflow and stream chemistry in a Swiss pre-Alpine headwater catchment : A fine scale investigation of flow occurrence and electrical conductivity in the temporary streams in the lower Studibach catchment
Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapsläraSammanfattning : Temporary streams and their dynamics have often been largely overseen in hydrological research and there is relatively little knowledge about how the occurrence of flow in these streams varies temporally and spatially. Temporary streams are important from a hydro- logical perspective because they affect water quantity and quality in downstream peren- nial reaches, and from an ecological perspective because they provide habitat to unique species. LÄS MER
9. The Effects of Depth and Hydrological Connectivity on Heavy Metal Loading in Riparian Zones
Magister-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : The area between a stream and land is known as a riparian zone. These zones are highly dynamic whichcarry and accumulate heavy metals and environmental contaminants. Discrete Riparian Input Zones(DRIPs) are a subset of such zones that carry concentrated amounts of water into streams at discrete points. LÄS MER
10. Hydrological catchment analysis from characterisation of organic matter in stream water
Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaperSammanfattning : Organic matter (OM) in aquatic systems is a complex field which have rapidly developed during the last decade due to the introduction of high resolution mass spectrometers. The composition of OM in the aquatic environment is directly dependent on factors such as oxygen supply, pH and the flow rate in the local system. LÄS MER