Sökning: "urban canyon"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden urban canyon.

1. 1. Numerical modelling of sound propagation to closed urban courtyards

   Författare :Maarten Hornikx; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; courtyard; urban noise abatement schemes; pseudospectral; road traffic noise; equivalent sources method; scale model study; urban canyon;

   Sammanfattning : Because modern urban environments suffer from excessive levels of road traffic noise, access to closed courtyards is essential in order to offer urban sound environments of high quality with regard to health and perceived sound. To reach this quality, which is described by the quiet side definition, the 24-hour equivalent noise level should be below 45 dB(A). LÄS MER

3. 2. Dispersion and Transformation of Traffic Exhaust Particles in the Urban Atmosphere

   Författare :Matthias Ketzel; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; condensation; deposition; dilution; particle size distribution; plume model; street canyon; traffic pollution; urban environment; turbulence; aerosol dynamics modelling; coagulation; Physics; Fysik; Fysicumarkivet A:2004:Ketzel;

   Sammanfattning : Ultrafine particles, their sources and fate in the atmosphere are currently key issues in atmospheric research owing to concern about their effects on human health and global climate. Traffic emissions are a dominating source of ultrafine particles, especially in urban areas. LÄS MER

4. 3. Sound propagation to two-dimensional shielded urban areas: a numerical and scale model study of façade treatments

   Författare :Maarten Hornikx; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; urban street canyon; scale model study; urban noise abatement schemes; road traffic noise; parabolic equation; equivalent sources model; 2.5-D geometry;

   Sammanfattning : .... LÄS MER

5. 4. Numerical study on flow and pollutant dispersion inside street canyons

   Författare :Yang Yunkai; Martinac Ivo; Peng Shia-Hui; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flow; Pollutant dispersion; CFD; Street canyon; Reliability; SRA - Energy; SRA - Energi;

   Sammanfattning : This thesis analyzes the characteristics of flow pattern and vehicle-emitted pollutant dispersion in roughness surface layer. In an urban environment, wind flow and transported-pollutant source interfere strongly with buildings and other roughness elements on the surface ground, which results in complex characteristics of flow pattern and pollutant dispersion in 3D circumstances. LÄS MER

7. 5. Outdoor thermal comfort of residents in a warm humid climate : A study on informal settlements in Dar es Salaam, Tanzania

   Författare :Modest Maurus Baruti; Boende och bostadsutveckling; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Outdoor thermal comfort; Microclimate; Thermal perception; Urbanites; Informal settlements; Informal urban fabric; Warm humid climates; Dar es Salaam; Physiological Equivalent temperature PET ; New Standard Effective Temperature SET* ; Universal Thermal Climate Index UTCI ;

   Sammanfattning : In the informal settlements of warm humid climates, where the majority of urbanites spend most of their time outdoors, a conducive thermal environment is crucial for their social and economic well-being. The overall aim of this thesis is to increase knowledge and understanding of outdoor thermal comfort in informal settlements in the warm and humid climate of Dar es Salaam, Tanzania. LÄS MER