Sökning: "moving sources"

Visar resultat 1 - 5 av 80 avhandlingar innehållade orden moving sources.

1. 1. Predicting the sound field from aeroacoustic sources on moving vehicles : Towards an improved urban environment

   Författare :Nicolas Pignier; Ciarán O'Reilly; Susann Boij; Michael Carley; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pass-by simulations; aeroacoustic sources; urban sound propagation; direct numerical beamforming; linear programming deconvolution; Kirchhoff approximation; moving sources; detached-eddy simulation; Ffowcs Williams-Hawkings; vehicle design; förbifartssimuleringar; aeroakustiska källor; urban ljudutbredning; direkt numerisk lobformning; avfaltning med hjälp av linjärprogrammering; Kirchhoffs approximation; rörliga källor; detached-eddy simulation; Ffowcs Williams-Hawkings; fordonsdesign; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : In a society where environmental noise is becoming a major health and economical concern, sound emissions are an increasingly critical design factor for vehicle manufacturers. With about a quarter of the European population living close to roads with heavy traffic, traffic noise in urban landscapes has to be addressed first. LÄS MER

3. 2. Aerosol Particle Sources Affecting the Swedish Air Quality at Urban and Rural Level

   Författare :Adam Kristensson; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; wood combustion; traffic; long distance transport; nucleation; urban; background; PM2.5; PM10; source contribution; PIXE; Physics; Environmental technology; Fysik; pollution control; emissions; Aerosol particle; sources; Miljöteknik; kontroll av utsläpp; size distribution; Fysicumarkivet A 2005:Kristensson;

   Sammanfattning : During the last decades anthropogenic aerosol particles have attracted much attention due to their adverse health effects and their influence of climate change, and in Sweden, there are mainly three aerosol sources that affect the air quality; domestic wood combustion, traffic, and long distance transport, which includes new particle formation. This work concerns the characterization of these sources and an estimate of how much they contribute to the aerosol particle number (ToN) and mass concentrations (PM) in Swedish cities and at background locations. LÄS MER

4. 3. Moving Images of Literature : Transformations of Literature in Contemporary Video and Film Installation Art

   Författare :Tanja von Dahlern; Johan Prof.; Paula Docent; Jesper Olsson; Uppsala universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Transformation; Adaptation; Intermediality; Cultural Memory; Video and Film Installation; Literature; Litteraturvetenskap;

   Sammanfattning : This study aims to contribute to a better understanding of the many engagements with literature beyond the literary field. More specifically, it studies different ways of staging and transforming literature in video and film installation since the 1990s. LÄS MER

5. 4. On the Directivity of Railway Noise Sources

   Författare :Xuetao Zhang; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; railway traction noise; railway rolling noise; line source; railway aerodynamic noise; moving source; equivalent source line; De-Dopplerization; sound emission time; sound immission time; directivity; the Doppler factor;

   Sammanfattning : This dissertation deals with the directivity of railway noise. The directivity of railway noise is of particular importance when we have high-rise buildings close to the track, tunnel openings, partial barriers, or when we calculate the maximum sound pressure level during a pass-by based on the sound power level of the different sub-sources of a train. LÄS MER

7. 5. ’Moving On’ and Transitional Bridges : Studies on migration, violence and wellbeing in encounters with Somali-born women and the maternity health care in Sweden

   Författare :Ulrika Byrskog; Marie Klingberg-Allvin; Pia Olsson; Birgitta Essén; Ragnhild Elise Johansen; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Somali-born women; violence; transition; migration; childbearing; midwife; maternal health; perinatal health; wellbeing; qualitative; case-control; International Health; Internationell hälsa; Kvinnor och mäns erfarenheter och upplevelser av könsrelaterat våld i väpnade konflikter;

   Sammanfattning : During the latest decade Somali-born women with experiences of long-lasting war followed by migration have increasingly encountered Swedish maternity care, where antenatal care midwives are assigned to ask questions about exposure to violence. The overall aim in this thesis was to gain deeper understanding of Somali-born women’s wellbeing and needs during the parallel transitions of migration to Sweden and childbearing, focusing on maternity healthcare encounters and violence. LÄS MER