Sökning: "Vacuum."

Visar resultat 16 - 20 av 607 uppsatser innehållade ordet Vacuum..

  1. 16. An Introduction to Symmetry Protected Topological Phases

    Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

    Författare :David Petrovic; [2023]
    Nyckelord :;

    Sammanfattning : In this thesis, we aim to display characteristics of symmetry protected topological phases within quantum mechanics (QM). Building on well known aspects of QM, we relate the formalism to basic group representation theory, and review the connection between projective symmetries and protected vacuum degeneracies. LÄS MER

  3. 17. Preliminary Design of a 30 kN Methane-Oxygen-powered Electric-Pump-fed Liquid Rocket Propulsion System

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Vikramjeet Das; [2023]
    Nyckelord :rocket engine; liquid rocket; methalox; electropump; LRPS; LPRE; liquid methane; electric pump feed system;

    Sammanfattning : The design of a liquid rocket propulsion system, unlike that of a standalone system, is intertwined with the overall development of a number of associated systems and is influenced by a multitude of conditions and considerations: from the requirements needed to accomplish the mission to the rationalizations involved behind the development of each rocket system and/or component. In my thesis, the preliminary design of a “new generation” 30 kN rocket engine driven by an electric pump feed system and running on liquid methane and liquid oxygen is performed. LÄS MER

  4. 18. Micromechanical Characterization of Thin Paper Materials

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen; Lunds universitet/Lunds Tekniska Högskola

    Författare :Linus Bengtsson; [2023]
    Nyckelord :Micromechanical characterization; SEM; In situ tensile testing; Paper deformation; Fiber orientation; Paper mechanics; Technology and Engineering;

    Sammanfattning : Hur ser framtidens hållbara förpackning ut och vad är den tillverkad av? För att besvara denna fråga blir mikromekanisk karakterisering av material en viktig parameter att utforska och förstå. I synnerhet är mikromekaniken hos tunna pappersmaterial intressant då materialet har användningspotential i flera förpackningsapplikationer. LÄS MER

  5. 19. A novel approach for functionalising and separating Tröger's Base Analogues

    Master-uppsats, Lunds universitet/Centrum för analys och syntes

    Författare :Emil Jakobsson; [2023]
    Nyckelord :Tröger s Base; Synthesis; Chromatography; Supramolecular chemistry; Diastereomers; Organic chemistry; Chemistry;

    Sammanfattning : Tröger’s Base (TB) is a bicyclic compound containing a methanodiazocine group between two aromatic rings. The methylene bridge forces the molecule to have a bent formation; thus, the aromatic rings are close to 90 degrees relative to each other, resulting in a rigid concave aromatic cavity. LÄS MER

  7. 20. Equine welfare assessment : assessing equine welfare using positive parameters

    Kandidat-uppsats, SLU/Dept. of Biosystems and Technology (from 130101)

    Författare :Heidi Nevala; [2023]
    Nyckelord :human-horse relation; natural living conditions; social bond analysis; time budget;

    Sammanfattning : This thesis examines positive parameters for assessing horse welfare. The purpose of the study was to examine what positive welfare parameters there are, and if they are valid or not. Data has been collected through a literature review. Findings suggest that behavioural indicators like yawning, vacuum chewing and play are not valid. LÄS MER