Sökning: "contact theory"

Visar resultat 1 - 5 av 283 avhandlingar innehållade orden contact theory.

  1. 1. La fórmula de tratamiento usted como marcador étnico del habla : Sus correlaciones con algunos factores de la tríada ecológica en contexto de etnias en contacto

    Författare :Miguel Angel Sarmiento; Johan Falk; Diana Bravo; Hernán Urrutia; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; majority group; minority group; politeness; address form usted; learning; culture; social psychology; Theory of Planned Action; Accomodation Theory; Theory of Rejection-Identification; Theory of Adaptive Control of Thought; Social Cognitive Theory; Theory of Ecological Systems; cognitive context; ethnic marker in speech; ethnic contact; behaviour; intention; assumptions; beliefs; ethnic identity; usted; attitudes; perceptions; Ecological Triad; Spanish language; Spanska språket;

    Sammanfattning : This study aims at exploring the social, affective and cognitive variables that would be related to the use of the address form usted in Chilean Spanish. Specifically, we refer to the use that can be observed in interactions between Chileans residing in Sweden. LÄS MER

  3. 2. Time-domain modelling of curve squeal: a fast model for one- and two-point wheel/rail contact

    Författare :Ivan Zenzerovic; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; two-point contact; non-Hertzian contact; dynamics coupling; rolling contact; tangential point-contact model; Curve squeal; time domain; frictional instability;

    Sammanfattning : Curve squeal is a type of railway noise that may arise when a railway vehicle negotiates a relatively tight curve. A single frequency, corresponding to a wheel mode, dominates the radiated sound, which makes squeal a very tonal noise. LÄS MER

  4. 3. Twisting and Gluing : On Topological Field Theories, Sigma Models and Vertex Algebras

    Författare :Johan Källén; Maxim Zabzine; Mathias Blau; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Topological field theory; Chern-Simons theory; Contact geometry; Sigma models; Poisson vertex algebras; Vertex algebras; String theory; Theoretical Physics; Teoretisk fysik;

    Sammanfattning : This thesis consists of two parts, which can be read separately. In the first part we study aspects of topological field theories. We show how to topologically twist three-dimensional N=2 supersymmetric Chern-Simons theory using a contact structure on the underlying manifold. LÄS MER

  5. 4. On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation

    Författare :Matin Shahzamanian Sichani; Mats Berg; Roger Enblom; Asier Alonso; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wheel-rail contact; non-elliptic contact; rail vehicle dynamics; rolling contact; vehicle-track interaction; wheel-rail damage; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Tribologi; The KTH Railway Group - Tribology; Vehicle and Maritime Engineering; Farkostteknik;

    Sammanfattning : The wheel-rail contact is at the core of all research related to vehicletrackinteraction. This tiny interface governs the dynamic performanceof rail vehicles through the forces it transmits and, like any high stressconcentration zone, it is subjected to serious damage phenomena. LÄS MER

  7. 5. Enforcing Legitimacy : Perspectives on the Relationship between Intervening Armed Forces and the Local Population in Afghanistan

    Författare :Lisa Karlborg; Jan Ångström; Louise Olsson; Chiara Ruffa; Mimmi Söderberg Kovacs; Robert Egnell; Uppsala universitet; []
    Nyckelord :armed intervention; local legitimacy; Afghanistan; intervening armed forces; military; local population; perceptions; soldiers; ISAF; noncombat contact; peace operations; peacekeeping; military doctrine; contact theory; fieldwork; Peace and Conflict Research; Freds- och konfliktforskning;

    Sammanfattning : Bolstering local perceptions of legitimacy in armed intervention has emerged as an important feature of increasingly complex international peace and statebuilding efforts. Yet, previous research has only begun to explore what local legitimacy entails to those involved in, and affected by, armed intervention. LÄS MER