Sökning: "flow resistivity"
Visar resultat 1 - 5 av 25 avhandlingar innehållade orden flow resistivity.
1. Ground Monitoring using Resistivity Measurements in Glaciated Terrains
Sammanfattning : The most common method of monitoring and mapping groundwatercontaminants is to extract and analyse a number of groundwatersamples from wells in the investigation area. However, thereare a number of limitations with this type of point-wiseinvestigation, as it is hard to acquire an adequate picture ofa heterogeneous and anisotropic subsurface using a fewpoints. LÄS MER
2. Micro-Structure Modelling of Acoustics of Open Porous Material
Sammanfattning : Transportation is a large and growing part of the world’s energy consumption. This drives a need for reduced weight of rail vehicles, just as it does for road vehicles. In spite of weight reductions, the vehicle still has to provide the same level of acoustic comfort for the passengers. LÄS MER
3. Characterisation of anisotropic acoustic properties of porous materials - inverse estimation of static flow resistivity
Sammanfattning : The production processes of porous materials introduce an inherent geometric anisotropy in the material at micro scale, which influences the material properties at macro scale. In this thesis, the focus is turned to one of these macroscopic properties, the flow resistivity, which is a measure of the resistance felt by the sound pressure waves as they propagate through a porous space. LÄS MER
4. Water in roads: Flow paths and pollutant spread
Sammanfattning : For better road construction and maintenance while minimising damage to the environment and groundwater, it is essential to monitor and model hydrological impacts on roads and consider pollution of groundwater. Water content in unbound material in road layers changes continuously and water flow usually occurs along pathways that are the main corridors for pollutant spread to groundwater. LÄS MER
5. Groundwater occurrence and risk of pollution in a mountain watershed of Nicaragua
Sammanfattning : Hydrogeological and geophysical methods were applied in the Río Artiguas watershed, a mountain basin located in central Nicaragua. This area is under environmental stress from anthropogenic activities like gold mining using mercury and waste disposal into the streams. LÄS MER