Sökning: "Tomas Nygren"

Hittade 3 avhandlingar innehållade orden Tomas Nygren.

  1. 1. Transmission of waves through elastic and viscoelastic junctions

    Författare :Tomas Nygren; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Wave; elastic; viscoelastic; extensional; characteristic impedance; junction; transmission; reflection; dissipation; optimisation; Materialvetenskap; Materials science; Teknisk materialvetenskap; Solid Mechanics; hållfasthetslära;

    Sammanfattning : Transmission of extensional waves through elastic and viscoelastic junctions between elastic and collinear bars have been studied theoretically and experimentally. The models used can be interpreted also for other types of waves (e.g. dilatational waves, shear waves, electromagnetic waves) and systems. LÄS MER

  3. 2. Skilda medievärldar : Lokal offentlighet och lokala medier i Stockholm

    Författare :Gunnar Nygren; Lars Nord; Tomas Andersson Odén; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; public sphere; political communication; local media; audience fragmentation; political attitudes; political participation; marketdriven journalism; knowledge gap; digital divide; media shadow; free newspapers; community integration; local identity; Media and communication studies; Medie- och kommunikationsvetenskap;

    Sammanfattning : The main purpose of this thesis is to study mediated political communication in Stockholm, focusing on media content as well as media consumption and the role media play in a democracy. The study is based on content analysis of local and regional media (newspapers, tv and radio) in the greater Stockholm region and on a survey with 2 440 answers from people living in different parts of the region. LÄS MER

  4. 3. Automation of front-end loaders : electronic self leveling and payload estimation

    Författare :I Yung; Leonid Freidovich; Sven Rönnbäck; Carlos Vázquez; Tomas Nygren; Heikki Handroos; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Front-End Loaders; Electronic Self Leveling; Modeling; Control; Disturbance estimation; Payload estimation; Equations of motion; Pressure-based friction;

    Sammanfattning : A growing population is driving automatization in agricultural industry to strive for more productive arable land. Being part of this process, this work is aimed to investigate the possibility to implement sensor-based automation in a particular system called Front End Loader, which is a lifting arms that is commonly mounted on the front of a tractor. LÄS MER