Sökning: "Underjordisk"
Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet Underjordisk.
1. Analysis of underground concrete pipelines subjected to seismic high-frequency loads
Sammanfattning : Buried pipelines are tubular structures that are used for transportation of important liquid materials and gas in order to provide safety for human life. During an earthquake, imposed loads from soil deformations on concrete pipelines may cause severe damages, possibly causing disturbance in vital systems, such as cooling of nuclear power facilities. LÄS MER
2. Microbially mediated manganese oxides enriched in yttrium and rare earth elements in the Ytterby mine, Sweden
Sammanfattning : Microorganisms are able to manipulate redox reactions and thus exert extensive control on chemical speciation and element partitioning in nature, affecting the formation and dissolution of certain minerals. One of these redox active elements is manganese (Mn), which in its oxidized states (III/IV), commonly forms Mn oxide-hydroxide minerals. LÄS MER
3. Modeling aspects of reliability-based design of lined rock caverns
Sammanfattning : The storage of large quantities of hydrogen gas in underground lined rock caverns (LRCs) could contribute to an efficient supply of fossil-free energy. The consequences of failure of such storage can be catastrophic, so representative predictive models and a small probability of failure are needed for the LRC design. LÄS MER
4. Measuring and Modelling PM Levels on Underground Platforms
Sammanfattning : Urban railways have become an essential part of the transportation network of cities due to their convenience and high capacity. To make full use of urban space, many urban railway platforms are built underground. LÄS MER
5. Magnetic properties of Neogene regional dikes from east Iceland with special reference to magma flow
Sammanfattning : This thesis deals with rock magnetic measurements on Neogene dikes from the eastern fjords of Iceland. A vast amount of dikes generally striking north-north-east occur as swarms in the glacially eroded lava pile. LÄS MER