Sökning: "upper stage"

Visar resultat 1 - 5 av 68 uppsatser innehållade orden upper stage.

  1. 1. Hydrogen storage systems : Methodology and model development for hydrogen storage systems performance evaluation based on a transient thermodynamic approach

    Master-uppsats, Mälardalens universitet/Akademin för ekonomi, samhälle och teknik

    Författare :Kreshnik Margaritari; [2023]
    Nyckelord :Hydrogen; Hydrogen storage system; Hydrogen filling process; Hydrogen storage system operation; Hydrogen storage system design; Hydrogen fast filling; Hydrogen tank modelling;

    Sammanfattning : The overall performance of a hydrogen storage system can be affected by various parameters, such as operation and design parameters, but also by the state of the hydrogen contained inside the storage tanks. In this work, a methodology is developed to evaluate the state of the hydrogen during the filling process and its impact on the overall system performance under variable operation conditions and design parameters. LÄS MER

  3. 2. 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. 3. Transferencias al español de un grupo de estudiantes suecos : Análisis de la influencia del sueco L1 y el inglés L2 en la adquisición del español L3

    Uppsats för yrkesexamina på avancerad nivå, Högskolan Dalarna/Institutionen för lärarutbildning

    Författare :Francesca Lippi; [2023]
    Nyckelord :L3 acquisition; transfer; Spanish; Swedish; English; language learning;

    Sammanfattning : Varios estudios han demostrado convincentemente que no solamente la L1, sino también la L2 puede afectar la adquisición de la L3. En particular, la L2 puede transferirse a la L3 si los dos idiomas tienen en común la estructura gramatical (Flynnet al., 2004) o la estructura sintáctica (Bardel y Falk, 2007). LÄS MER

  5. 4. Renovering av 70-talsvilla med avseende på energibesparing och klimatpåverkan

    Kandidat-uppsats, Malmö universitet/Fakulteten för teknik och samhälle (TS)

    Författare :Yllnor Tmava; Omar Assaad; [2023]
    Nyckelord :Hållbar renovering; 70-talsvilla; Energibesparing;

    Sammanfattning : The climate impact of the construction sector, due to energy and material usage, constitutes the largest global climate burden. In Sweden, the construction sector accounts for 40% of the total energy consumption and 18% of greenhouse gas emissions. The country aims for net-zero emissions by 2045. LÄS MER

  7. 5. Swedish Upper Secondary English Teachers’ Beliefs and Practices Regarding CLIL

    Uppsats för yrkesexamina på avancerad nivå, Malmö universitet/Fakulteten för lärande och samhälle (LS)

    Författare :Tina Erlvik; Alexander Rau; [2023]
    Nyckelord :Content and Language Integrated Learning; CLIL; Teacher beliefs; Teacher practices; Foreign language instructions;

    Sammanfattning : English has been on the rise on the global stage for the last half century, and is now the most studied second language, being used regularly in international academia, social and mainstream media and international relations. In Sweden, the increase in the use of English is particularly noticeable in the country’s higher education system, with recent studies reporting a significant increase in English as the language of instruction. LÄS MER