Sökning: "collapse resistance"

Visar resultat 1 - 5 av 23 uppsatser innehållade orden collapse resistance.

  1. 1. Off-State Stress Effects in AlGaN/GaN HEMTs : Investigation of high-voltage off-state stress impact on performance of and its retention in hybrid-drain ohmic gate AlGaN/GaN HEMTs

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Ivan Krsic; [2023]
    Nyckelord :HEMT; GaN; off-state stress; memory effects; drain leakage current; dynamic RDSon; threshold voltage instabilities; charge redistribution; HEMT; GaN; stress i avslaget tillstånd; minneseffekter; läckströmmen; dynamisk RDSon; instabiliteten hos styrets tröskelspänning; omfördelningen av laddningar;

    Sammanfattning : High electron mobility transistors (HEMTs) realized using AlxGa1-xN/GaN are relatively new technology which is prominent for high-speed and high-power applications. Some of the main problems with this technology were identified as dynamic RDSon, current collapse and threshold voltage instabilities due to the off-state stress. LÄS MER

  3. 2. Study of process parameters in laser beam welding of copper hairpins

    Kandidat-uppsats, Högskolan i Skövde/Institutionen för ingenjörsvetenskap

    Författare :Dan Lönn; David Spångberg; [2022]
    Nyckelord :Laser Welding; Hairpin Welding; Copper Laser Welding; Process Parameter; Multi-Physical Simulation; Computed Tomography Scan; Design of Experiment;

    Sammanfattning : This study had the purpose to further the use of industrial lasers in the manufacturing of hairpin electric motors by optimizing the process of contacting the hairpins. A problem with laser beam welding of copper is the porosity created in the process which can lead to increased resistance of the welded region along with degraded mechanical properties. LÄS MER

  4. 3. Brandväggar : Litteraturstudie samt enkät- och intervjustudie om branschens erfarenheter och synpunkter

    Master-uppsats, Luleå tekniska universitet/Byggkonstruktion och brand

    Författare :Oskar Grönlund; Alexander Winroth; [2021]
    Nyckelord :Brandvägg; Brand; EN 1363-2; Mekanisk inverkan; M-klass;

    Sammanfattning : In accordance with BBR 29 regulation 5:244, firewalls must with sufficient reliability be ableto constrain a fire without the intervention of the fire rescue service. The wall must alsowithstand probable mechanical impact in the event of a fire. LÄS MER

  5. 4. Seismic retrofitting assessment of historical churches : The reconstruction of The Basilica of Santa Maria di Collemaggio after the 2009 L’Aquila earthquake

    Uppsats för yrkesexamina på grundnivå, Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

    Författare :Angelika Hedenström; [2020]
    Nyckelord :L’Aquila; earthquake; reconstruction; church; Basilica; Santa Maria di Collemaggio; Collemaggio; historical; heritage; preservation; seismic; retrofit; SHM;

    Sammanfattning : This study summarizes previous research to evaluate and verify the results of the extensive restoration of The Basilica of Santa Maria di Collemaggio after the 2009 L’Aquila earthquake. In addition, it aims at identifying the vulnerability factors and challenges in preserving these buildings. LÄS MER

  7. 5. Temperature distribution in air tight cavities of steel framed modular buildings when exposed to fire

    Uppsats för yrkesexamina på grundnivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Elin Bergroth; Greta Torstensson; [2019]
    Nyckelord :Cavities; fire furnace; fire test; modular building; steel; TASEF; Brandugn; brandtest; hålrum; modulbyggnader; stål; TASEF;

    Sammanfattning : A common way to construct large buildings is by assemble prefabricated modules around a load bearing steel construction. However, if a fire occurs these buildings can be subject to a rapid fire spread due to its cellular nature. LÄS MER