Sökning: "space"

Visar resultat 16 - 20 av 5017 avhandlingar innehållade ordet space.

  1. 16. Alfvén Waves and Energy Transformation in Space Plasmas

    Författare :Yuri Khotyaintsev; Kalevi Mursula; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; Alfvén waves; particle acceleration; ionosphere; magnetopause; magnetic reconnection; Rymd- och plasmafysik; Space physics; Rymdfysik; Space Physics; rymdfysik;

    Sammanfattning : This thesis is focused on the role of Alfvén waves in the energy transformation and transport in the magnetosphere. Different aspects of Alfvén wave generation, propagation and dissipation are considered. The study involves analysis of experimental data from the Freja, Polar and Cluster spacecraft, as well as theoretical development. LÄS MER

  3. 17. Escape to space or return to venus : ion flows measured by venus express

    Författare :Moa Persson; Yoshifumi Futaana; Hans Nilsson; Maria Hamrin; Dmitrij Titov; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Venus; water; escape; planetary physics; oxygen; O ; hydrogen; H ; ions; space physics; space plasma physics; Venus Express; ASPERA-4; IMA; spacecraft measurements; rymd- och plasmafysik; Space and Plasma Physics;

    Sammanfattning : The present-day Venusian atmosphere is crushingly dense, extremely hot and arid. Yet, in its early history, Venus presumably had a massive amount of water, which, if spread evenly over the surface, provided a water depth of 10s to 100s of meters. Therefore, over the course of the atmospheric evolution, the water must have been removed from Venus. LÄS MER

  4. 18. Space in motion : the art of activating space in-between

    Författare :Monica Sand; Abdellah Abarkan; Annette Arlander; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HUMANIORA; HUMANITIES; in-between; dispersed production; producer observer; bridge; swing; penelope; Architecture; Arkitektur; Art; Konstvetenskap;

    Sammanfattning : As a contribution to the emerging field of practice-based research in the arts, this thesis aims to activate space, experience and the concept in-between. As the in-between cannot be defined ahead of the rhythmic process it carries out and of which it is a part – a rhythm inherent in the city itself and in knowledge production – it is necessary to produce rhythmic relations between bodies, sites and concepts. LÄS MER

  5. 19. Short Proofs May Be Spacious : Understanding Space in Resolution

    Författare :Jakob Nordström; Johan Håstad; Albert Atserias; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Proof complexity; resolution; space; length; width; separation; lower bound; pebble game; pebbling formula; Beviskomplexitet; resolution; minne; längd; bredd; separation; undre gräns; pebblingspel; pebblingformel; Theoretical computer science; Teoretisk datalogi;

    Sammanfattning : Om man ser på de bästa nu kända algoritmerna för att avgöra satisfierbarhet hos logiska formler så är de allra flesta baserade på den så kallade DPLL-metoden utökad med klausulinlärning. De två viktigaste gränssättande faktorerna för sådana algoritmer är hur mycket tid och minne de använder, och att förstå sig på detta är därför en fråga som har stor praktisk betydelse. LÄS MER

  7. 20. Re-negotiating social space : Public art installations and interactive experience

    Författare :Linda Ryan Bengtsson; Miyase Christensen; André Jansson; Karin Becker; Karlstads universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Interactivity; interactive art; public space; social space; locative media artworks; interactive interfaces; Media and Communication Studies; Medie- och kommunikationsvetenskap;

    Sammanfattning : Digital media technologies are becoming increasingly and extensively integrated into our way of living. We communicate, inform and entertain ourselves through media technologies in disparate spaces. When digital technology is integrated into our everyday environment, the border between media interfaces and physical environments is blurred. LÄS MER