Sökning: "based loop space"

Visar resultat 1 - 5 av 47 avhandlingar innehållade orden based loop space.

  1. 1. Inverter Design for SiC-based Electric Drive Systems with Optimal Redundant States Control of Space Vector Modulation

    Författare :Georgios Mademlis; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Space Vector Modulation; Silicon Carbide SiC ; Tidal power; Power Hardware-in-the-Loop; Common Mode Voltage; Maximum Power Point Tracking MPPT ; Medium Voltage Converters; Voltage balancing; Electric Vehicle; Multilevel; Neutral Point Clamped NPC ;

    Sammanfattning : The need for inverters with ever increasing power density and efficiency has recently become the driving factor for research in various fields. Increasing the operating voltage of the whole drive system and utilizing newly developed SiC power switches can contribute towards this goal. LÄS MER

  2. 2. Stringed along or caught in a loop? : Philosophical reflections on modern quantum gravity research

    Författare :Keizo Matsubara; Lars-Göran Johansson; Holger Lyre; Uppsala universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; quantum gravity; string theory; loop quantum gravity; philosophy of physics; philosophy of science; scientific realism; structural realism; multiverse; thought experiments; Theoretical Philosophy; Teoretisk filosofi;

    Sammanfattning : A number of philosophical questions, all connected to modern research in quantum gravity, are discussed in this dissertation.The goal of research in quantum gravity is to find a quantum theory for gravitation; the other fundamental forces are already understood in terms of quantum physics. LÄS MER

  3. 3. Chekanov-Eliashberg dg-algebras and partially wrapped Floer cohomology

    Författare :Johan Asplund; Tobias Ekholm; Baptiste Chantraine; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Symplectic geometry; Contact geometry; Chekanov-Eliashberg dg-algebra; partially wrapped Floer cohomology; Lagrangian submanifold; Legendrian submanifold; singular Legendrians; based loop space; Mathematics; Matematik;

    Sammanfattning : This thesis consists of an introduction and two research papers in the fields of symplectic and contact geometry. The focus of the thesis is on Floer theory and symplectic field theory. LÄS MER

  4. 4. Analysis of VSC-based HVDC systems

    Författare :Georgios Stamatiou; Chalmers University of Technology; []
    Nyckelord :HVDC; MMC; MTDC; Poor damping; Symbolic eigenvalue expressions; Droop control; Passivity Analysis; Net damping; Frequency Domain Analysis; VSC;

    Sammanfattning : The main objective of this thesis is to perform stability and control studies in the area of VSC-HVDC systems. A major part of the investigation focuses on the development of procedures, whose aim is to understand, explain and avoid poorly-damped conditions or instability that may appear due to dc-side resonances, which stem from the interaction of converters and passive elements in such systems. LÄS MER

  5. 5. Phase Sensitive Amplifiers for Free-Space Optical Communications

    Författare :Ravikiran Kakarla; Chalmers University of Technology; []
    Nyckelord :Phase sensitive amplifier; sensitivity; optical injection locking; noisefigure;

    Sammanfattning : The demand for high data rate free-space communications is increasing due to the planned future space exploration missions. In the next few years there is a need to increase the speed by 100 times according to NASA, and this necessitates that transmission systems operate at higher carrier frequencies. LÄS MER