Sökning: "Urban Canyons"

Visar resultat 1 - 5 av 14 uppsatser innehållade orden Urban Canyons.

1. 1. Implementing spatial variance in the rate of photolytic breakdown of NO2 in urban street canyons

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :Fabian Friberg; [2022]
   Nyckelord :cfd; computational fluid dynamics; NOx; street canyon; NO2; NO; O3; photolysis; OpenFOAM; Physics and Astronomy;

   Sammanfattning : In this study a module for calculating the solar exposure of individual fluid cells was developed to more accurately represent the effect of photolysis on the pollutant dispersion in an urban street canyon. The module was tested and validated on 12 different cases, each with a different geographical location, time of year and/or time of day. LÄS MER

3. 2. Multilateration in Direct ShortRange Communications Networks : Utilising Basic Safety Messages and Received Signal Strength Ranging

   Kandidat-uppsats, Linnéuniversitetet/Institutionen för datavetenskap och medieteknik (DM)

   Författare :Andrew Galbraith; [2020]
   Nyckelord :DSRC; trilateration; multilateration; RSS; V2X;

   Sammanfattning : Traditional satellite positioning systems have limited resolution and have proved inaccuratein areas such as urban canyons where signals are subject to bounce phenomena or indeed may be entirely unavailable. An alternative method of positioning is that of tri/multilateration, which uses known positions and distances from beacon points to locate a receiver. LÄS MER

4. 3. Vehicular Positioning Using 5G and Sensor Fusion

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Seyed Samie Mostafavi; [2019]
   Nyckelord :Positioning; 5G; Sensor Fusion; Beamforming; IMU; Kalman Filter;

   Sammanfattning : Recent advances in the telecommunications industry and the resulting applicationssuch as autonomous vehicles, vehicle surveillance and traffic safetyhas increased the demand for accurate and robust vehicle positioning systems.Existing Global Navigation Satellite System (GNSS) based positioning techniquesface significant performance loss in the tunnels and urban canyons. LÄS MER

5. 4. GNSS Timing Receiver Performance in Urban Canyons

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Xiangcheng Fu; [2019]
   Nyckelord :GNSS Timing Receiver; 1PPS; Synchronization; Urban Canyon;

   Sammanfattning : Time synchronization is critical for the operation of radio base stations (RBS) in telecommunication companies. Global navigation satellite system (GNSS) is an existing technology to provide precise timing information to distributed RBSs. LÄS MER

7. 5. Daylighting and sunlighting in street canyons. A quantitative research on the visual perception and in-situ daylight measurements of four urban canyons in Copenhagen.

   Master-uppsats, Lunds universitet/Institutionen för arkitektur och byggd miljö; Lunds universitet/Avdelningen för Energi och byggnadsdesign

   Författare :Olesja Lami; [2019]
   Nyckelord :daylighting; sunlighting; urban canyon; visual perception; visual comfort; Technology and Engineering;

   Sammanfattning : “Light creates ambience and the feel of a place, as well as the expression of a structure.” Le Corbusier With the current urban pressure and large waves of immigration, cities are facing an increase in population and therefore urban densification. This increase in building quantities affects daylight reaching the public space. LÄS MER