Sökning: "water level"

Visar resultat 21 - 25 av 992 avhandlingar innehållade orden water level.

1. 21. Water and Heat Transport in Road Structures : Development of Mechanistic Models

   Författare :Klas Hansson; Lars-Christer Lundin; Kurt Roth; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrology; Water flow; Heat flow; Unsaturated flow; Freeze-thaw; Numerical models; Uncertainty analysis; Sensitivity analysis; Roads; Overland flow; Flow patterns; TDR; Water content reflectometer; Calibration; Fractures; Hydrologi; Hydrology; Hydrologi;

   Sammanfattning : The coupled transport of water and heat, involving freezing and thawing, in the road structure and its immediate environment is important to consider for optimal design and maintenance of roads and when assessing solute transport, of e.g. de-icing salt, from roads. LÄS MER

3. 22. Greek Cisterns : Water and risk in ancient Greece, 600–50 BC

   Författare :Patrik Klingborg; Gunnel Ekroth; Henrik Gerding; Michaeol Lindblom; Jutta Stroszeck; Uppsala universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Cisterns; Greece; Water; Risk; Materiality; Water supply; Classical Archaeology and Ancient History; Antikens kultur och samhällsliv;

   Sammanfattning : This study explores cisterns in the Greek world 600–50 BC based on a representative body of archaeological material of 410 cisterns from 49 sites presented in a catalogue, and the literary and epigraphic evidence. The aim is to investigate when and how cisterns were constructed, how they were used and functioned in ancient Greek society and why they were used only at certain times. LÄS MER

4. 23. Efficient Management of Water Utilities : Sustainability Analysis of Swedish Performance

   Författare :Nasik Najar; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sustainability index; reinvestment; facilities status; climate adaptation and flood security; ; water utility in Sweden;

   Sammanfattning : In Sweden, a sustainability index (SI) has been used since 2014 as an internal benchmark management tool to analyse and steer municipal water and wastewater (WW) activities toward sustainability. A consistent trend in national results from SI across all years is that while day-to-day operations are working well, there are deficiencies in strategies for long-term planning. LÄS MER

5. 24. Catalytic Water Production from First-Principles Calculations

   Författare :Gustav Karlberg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; platinum; Monte Carlo; first-principles; hydroxyl; transition metals; density functional theory DFT ; Metropolis; oxygen; water; water production reaction; hydrogen;

   Sammanfattning : The main subject of this thesis is the catalytic water production reaction on metal surfaces. This reaction is of great current interest due to its importance in fuel cells, a clean and efficient way to convert chemical energy into electrical. LÄS MER

7. 25. Groundwater resources in hard rock coastal terrains : Insights into heterogeneity and spatial variability

   Författare :Robert Earon; Bo Olofsson; Okke Batelaan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Crystalline Rock; Groundwater Balance; Kinematic porosity; Groundwater Recharge; Water Security; Coastal Aquifer; Land and Water Resources Engineering; Mark- och vattenteknik;

   Sammanfattning : Challenges regarding water security in hard rock coastal regions with limited soil cover are: a seasonal absence of recharge during times of peak residency, heterogeneity and variability of the fracture network, close proximity to saline water sources and spatially inconsistent storage and extraction. In areas where it is not feasible to connect residents to municipal water systems, a better understanding of the resilience of reservoirs is needed. LÄS MER