Sökning: "moving source"

Visar resultat 1 - 5 av 96 avhandlingar innehållade orden moving source.

  1. 1. 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

  3. 2. Verbs of Motion with Directional Prepositions and Prefixes in Xenophon's Anabasis

    Författare :Sanita Balode; Grekiska (antik och bysantinsk); []
    Nyckelord :HUMANIORA; HUMANITIES; Xenophon; Anabasis; prefixes; prepositional phrases; verbs of motion; surface elements; semantic elements; motion event; moving entity; landmark; source; path; goal; space; direction; trajectory; synonymy;

    Sammanfattning : The thesis compares different prepositions and verbal prefixes denoting direction in Ancient Greek. The corpus covers passages in Xenophon’s Anabasis where such directional elements are used. LÄS MER

  4. 3. Natural and Controlled Source Magnetotelluric Data Processing and Modeling

    Författare :Chunling Shan; Thomas Kalscheuer; Laust Pedersen; Mehrdad Bastani; Thorkild Rasmussen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Airborne Electromagnetic Method; Radio Magnetotellurics; Controlled Source Magnetotellurics; Electrical Resistivity Tomography; Moving Magnetotellurics; 2D inversion; 3D inversion;

    Sammanfattning : In this thesis, four studies using different geophysical electromagnetic methods are presented. In the first study dealing with airborne measurements, the noise response due to the rotation of the aircraft and the aircraft itself as a metallic conductive body on the Earth's electromagnetic response in very low frequency and low frequency band was investigated. LÄS MER

  5. 4. 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

  7. 5. 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