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Visar resultat 1 - 5 av 39 uppsatser som matchar ovanstående sökkriterier.

1. 1. Wide-Angle Radome Design for Low-Cost Additive Manufacturing

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Martin Fajerberg; Mattias Nylander; [2022]
   Nyckelord :Radar; Radome; A-Sandwich; B-Sandwich; Multilayer; Polarization; Angle of Incidence; Finite Element Method; Differential Evolution Optimization; Transmission Line Theory; Honeycomb; Additive Manufacturing; Electromagnetic Theory; Technology and Engineering;

   Sammanfattning : The radome, a portmanteau of the words radar and dome, is a protective dielectric cover to protect a radar from its surrounding environment. The surrounding environment can be rain, wind, sand, dust and whatever else that might harm the radar. LÄS MER

3. 2. Inverse Atmospheric Dispersion Modeling in Complex Geometries

   Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

   Författare :Charlie Pelland; [2022]
   Nyckelord :atmospheric dispersion modeling; dispersion modeling; invers dispersion modeling; atmospheric dispersion; invers atmospheric dispersion; CFD; computational fluid dynamics; radioactive release; openfoam; CRBN; dry deposition; dry deposition velocity; scavenging effect; wet deposition; optimization model; Reynolds Averaged Navier-Stokes; adjoint mode; time-dependent rain simulation; time-dependent rain; time dependent rain simulation; time dependent rain;

   Sammanfattning : In the event of a radioactive release in an urban environment the consequent response mustbe swift and precise. As soon as first responders have correct information, they can make anaccurate risk assessment. However, if the position, release rate and time of the radioactiverelease is unknown it is hard to know how the pollutant will spread. LÄS MER

4. 3. Combining energy harvesting sources for increased system availability and using an input switching algorithm to maximise battery lifetime

   Master-uppsats, KTH/Maskinkonstruktion (Inst.)

   Författare :Anton Hylander; [2022]
   Nyckelord :;

   Sammanfattning : Energy harvesting is commonly used for powering low power electronics, for example Low Power Wide Area Networks (LPWAN). Many energy sources are natural (e.g. solar or wind), thus the harvested power can depend on weather, time of day, and time of year. LÄS MER

5. 4. Simulation strategies for improved contamination modeling of liquid dynamics on automotive surfaces

   Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

   Författare :Thisal Mandula Sugathapala; Twan Bakker; [2022]
   Nyckelord :Volume of Fluid; Contamination modeling; Blended Kistler model; Dynamic contact angle models; Exterior water management; Light-induced fluorescence imaging; Multiphase flows; Surface flows; Computational fluid dynamics; Sensor soiling;

   Sammanfattning : A significant level of research is currently being carried out in the development of driver support systems as they are expected to play a key role in minimizing road vehicle accidents and creating a safe driving environment under harsh weather conditions. However, the performance of some components used by existing driver support systems like LIDAR and visual cameras are affected by extreme weather conditions such as heavy rain fall and snow. LÄS MER

7. 5. Flood modelling in urban areas : A comparative study of MIKE 21 and SCALGO Live

   Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

   Författare :Evelina Andersson; [2021]
   Nyckelord :SCALGO Live; MIKE 21; Stormwater Model; Flood Model; Cloudburst; Inundation; Comparative;

   Sammanfattning : Pluvial flooding originating from extreme rainfall is problematic and an increasing issue in Sweden. Higher requirements on adapting cities in urban areas to these challenges have been placed on both municipalities and the county administration. Thus, an increased need for water modelling, both in existing and planned areas have emerged. LÄS MER