Sökning: "power loss"

Visar resultat 11 - 15 av 514 avhandlingar innehållade orden power loss.

  1. 11. I vinst och förlust : Köpmäns nätverk i 1500-talets Östersjöstäder

    Författare :Lovisa Olsson; Martin Wottle; Thomas Småberg; Dag Lindström; Södertörns högskola; []
    Nyckelord :HUMANIORA; HUMANITIES; Trade; Early modern history; Baltic Sea region; Credit networks; Urban history; Embedded economy; Network analysis; Town councils; Spatiality; Mobility; Economic history; Handel; Tidigmodern historia; Östersjöregionen; Kreditnätverk; Urbanhistoria; Inbäddad ekonomi; Nätverksanalys; Städernas råd; Spatialitet; Mobilitet; Ekonomisk historia; Historical Studies; Historiska studier; Östersjö- och Östeuropaforskning; Baltic and East European studies;

    Sammanfattning : This thesis aims to clarify how the merchant networks involved in the trade across the Baltic Sea interplayed with and contributed to create the economic culture of the Baltic Sea region. This is achieved by examining the economic, social, spatial and political aspects of the trade networks in relation to the social organisation of the early modern towns of Stockholm, Lübeck, Malmö and Reval (Tallinn) in the 16th century. LÄS MER

  3. 12. On Techno-economic Assessment of a Multi-terminal VSC-HVDC in AC Transmission Systems

    Författare :Feng Wang; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transmission Grid.; Loss minimization; AC DC system; Transmission expansion planning; Multi-terminal VSC-HVDC; Cost minimization; Cost-benefit analysis; Electric power system; Optimal power flow;

    Sammanfattning : The Voltage Source Converter based Multi-Terminal high voltage Direct Current transmission system (VSC-MTDC) is currently considered as an attractive technical option for increased transmission capacity and improved controllability and flexibility of an electric power grid, thanks to its unique performance characteristics, and the possibility of using the extruded XLPE cables. In the planning process of embedding a VSC-MTDC system into an ac transmission grid, one must assess the potential values in terms of improved energy efficiency, i. LÄS MER

  4. 13. On soft-switching isolated AC/DC converters without auxiliary circuit

    Författare :Staffan Norrga; Stefan Östlund; Rik De Doncker; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical power technology; voltage source converter; cycloconverter; isolated converter; medium frequency transformer; soft switching; modulation; commutation; wind power; electric traction; Elkraftteknik; Electric power engineering; Elkraftteknik;

    Sammanfattning : The thesis is concerned with a class of power electronic converter systems that permit bidirectional AC/DC conversion with galvanic separation of the AC and DC sides by a transformer operating at elevated frequency. The systems consist of a capacitively snubbered voltage source converter and a cycloconverter, separated by the mentioned transformer. LÄS MER

  5. 14. High-efficiency Power Amplification Techniques for Wireless Transmitters

    Författare :Hossein Mashad Nemati; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; load modulation; LDMOS; supply modulation; GaN HEMT; Power amplifier; wireless communications.; GaAs mHEMT; efficiency;

    Sammanfattning : The low efficiency of existing power amplifiers (PAs) is causing excessive energy consumption in wireless systems. Improving the PA efficiency is therefore of great environmental and economical importance. LÄS MER

  7. 15. Loss Mechanisms In Non-Fullerene Organic Solar Cells

    Författare :Huotian Zhang; Feng Gao; Olle Inganäs; Weimin Chen; Jenny Nelson; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; photovoltaics; organic solar cell; non-fullerene; charge recombination; voltage loss; fill factor;

    Sammanfattning : Photovoltaics are one of the most important sustainable energy sources in the 21st century. Among photovoltaics, organic solar cells (OSCs) offer many advantages such as ease of processing, lightweight, the potential for flexibility, and tunable properties. Its peculiar nature and complexity present a fascinating charm, attracting many researchers. LÄS MER