Sökning: "peter johannesson"

Hittade 4 avhandlingar innehållade orden peter johannesson.

  1. 1. Ultrahigh-Voltage Silicon Carbide Device Performance, Requirements, and Limitations in High-Power Applications

    Författare :Daniel Johannesson; Hans-Peter Nee; Staffan Norrga; Muhammad Nawaz; Alberto Castellazzi; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 4H-SiC; Current Filamentation; Device Characterization; Dynamic Avalanche; JTE Structure; Junction Termination Extension Design; SiC BJT; SiC GTO Thyristor; SiC IGBT; SiC MOSFET; SiC PiN Diode; Silicon Carbide; TCAD Simulation; Wide bandgap device; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The increased awareness of the on-going climate change accelerates the electric energy system transformation from fossil-fueled power sources towards systems with larger portions of renewable energy sources. Moreover, the grid infrastructure requires reinforcements to cope with increasing electrical energy demand. LÄS MER

  3. 2. Multi-terminal HVDC protections based on transient line modeling

    Författare :Niclas Johannesson; Staffan Norrga; Hans-Peter Nee; Jef Berteen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC transmission; HVDC protection; traveling wave protection; MTDC protection; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : High voltage direct current (HVDC) is considered one of the critical technologies required for the power system to enable the transition toward renewables. With an increasing geographical density of HVDC converters, there is a potential for optimization by connecting more than two converters into a shared DC transmission system, thus forming a multi-terminal HVDC (MTDC) system. LÄS MER

  4. 3. Analyticity, Necessity and Belief : Aspects of two-dimensional semantics

    Författare :Eric Johannesson; Peter Pagin; Dag Westerståhl; Graeme Forbes; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; two-dimensional semantics; quantified modal logic; propositional attitudes; belief ascriptions; Kripke; descriptivism; necessity; apriority; analyticity; Theoretical Philosophy; teoretisk filosofi;

    Sammanfattning : A glass couldn't contain water unless it contained H2O-molecules. Likewise, a man couldn't be a bachelor unless he was unmarried. Now, the latter is what we would call a conceptual or analytical truth. It's also what we would call a priori. LÄS MER

  5. 4. Essays on economic evaluation in health care : evaluation of hormone replacement therapy and uncertainty in economic evaluations

    Författare :Niklas Zethraeus; Handelshögskolan i Stockholm; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : This thesis contains six papers closely related to current research topics in the field of economic evaluation in health care. The thesis discusses methodological features of cost-effectiveness analysis (CEA) and cost-benefit analysis (CBA). It further relates to issues of modelling and how to account for uncertainty in economic evaluations. LÄS MER