Sökning: "source"

Visar resultat 6 - 10 av 5037 avhandlingar innehållade ordet source.

1. 6. Acoustic source characterisation for non-linear in-duct sources

   Författare :Fredrik Albertson; KTH; []
   Nyckelord :in-duct source; source characterisation; non-linear source; linearity test; hybrid method; IC-engine; muffler; coupling method;

   Sammanfattning : Different ways to model acoustic in-duct sources have beenanalysed. Measurements were conducted on two diesel truckengines. It was found that for steady state oscillations, onecould linearise in the neighbourhood of a given linearisationpoint, i.e. LÄS MER

3. 7. Analyses and Application of Ambient Seismic Noise in Sweden : Source, Interferometry, Tomography

   Författare :Hamzeh Sadeghisorkhani; Ólafur Gudmundsson; Ari Tryggvason; Roland Roberts; Frederik Tilmann; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Seismic interferometry; Ambient noise; Surface wave; Wave propagation; Inverse theory; Sweden; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

   Sammanfattning : Ambient seismic noise from generation to its application for determination of sub-surface velocity structures is analyzed using continuous data recordings from the Swedish National Seismic Network (SNSN). The fundamental aim of the thesis is to investigate the applicability of precise velocity measurements from ambient noise data. LÄS MER

4. 8. Att tolka spåren från det förflutna : Innebörder, lärande och meningsskapande av historisk källtolkning i gymnasiet

   Författare :Patrik Johansson; Ingrid Carlgren; Martin Stolare; Per Eliasson; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; History teaching; historical learning; history education; historical consciousness; historical thinking; upper secondary school; object of learn- ing; learning study; phenomenography; variation theory; primary source analysis; source criticism; source interpretation; Subject Learning and Teaching; ämnesdidaktik;

   Sammanfattning : This licentiate thesis explores the activity of historical reasoning in terms of primary source analysis among upper secondary school students. The thesis is a compilation of two scientific articles in history didactics. LÄS MER

5. 9. Open Source Business Model : Balancing Customers and Community

   Författare :Thomas Rosén; Staffan Brege; Anna Öhrwall-Rönnbäck; Stefan Hrastinski; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Open Source Software; Business Models; Strategic Management; Market Positioning; Resource Based View; Industrial engineering and economy; Industriell teknik och ekonomi;

   Sammanfattning : Free and Open Source Software has not only increased researchers’ interest about community-driven software development, but lately, interest from commercial actors increased as well. In addition, some scientists have claimed that Open Source Software has entered a new phase: OSS 2.0. LÄS MER

7. 10. Source-channel coding for wireless networks

   Författare :Niklas Wernersson; Mikael Skoglund; Norbert Goertz; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Source coding; channel coding; joint source-channel coding; multiple description coding; soft decoding; permutation codes; Telecommunication; Telekommunikation;

   Sammanfattning : The aim of source coding is to represent information as accurately as possible using as few bits as possible and in order to do so redundancy from the source needs to be removed. The aim of channel coding is in some sense the contrary, namely to introduce redundancy that can be exploited to protect the information when being transmitted over a nonideal channel. LÄS MER