Sökning: "great power"

Visar resultat 16 - 20 av 602 avhandlingar innehållade orden great power.

  1. 16. Active Distributed Power Systems Functional Structures for Real-Time Operation of Sustainable Energy Systems

    Författare :Jörgen Svensson; Industriell elektroteknik och automation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automation; Distributed power systems; RES; Power electronics; Energy management system; Real-time operation; Advanced functions; Communication; Elektronik och elektroteknik; Electronics and Electrical technology; robotics; control engineering; Automatiska system; robotteknik; reglerteknik;

    Sammanfattning : Present power system will face great challenges in several areas depending on the market economy, extensive global integration and constant need for more electric power, which will force the system to operate much closer to its stability limits. Meeting these challenges may involve improving and complementing or even total restructuring of the power systems. LÄS MER

  3. 17. 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

  4. 18. Theory and Design of Efficient Active Load Modulation Power Amplifiers

    Författare :Han Zhou; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GaN; circulator; non-reciprocity; Doherty power amplifier; Combiner synthesis; CLMA; deep power back-off; energy efficiency;

    Sammanfattning : The increasing demand for mobile data traffic has put new challenges and requirements for the development of the wireless communication infrastructure. The performance of the RF power amplifier (PA) is, in particular, of great importance, since it is the key building block for microwave transmitters in base stations and radio link equipment. LÄS MER

  5. 19. Design and Optimization Considerations of Medium-Frequency Power Transformers in High-Power DC-DC Applications

    Författare :Amin Bahmani; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanocrystalline-Magnetic Core; High-Power Isolated DC-DC Converter; Solid-State Transformers; Leakage Inductance; Isolation Requirements; Medium-Frequency Power Transformer;

    Sammanfattning : Recently, power electronic converters are considered as one of the enabling technologies that can address many technical challenges in future power grids from the generation phase to the transmission and consequently distribution at different voltage levels. In contrast to the medium-power converters (5 to 100 kW) which have beenessentially investigated by the automotive and traction applications, megawatt and medium-voltage range isolated converters with a several kilohertz isolation stage,also called solid-state transformers (SST), are still in an expansive research phase. LÄS MER

  7. 20. Kampen mot § 23 : Facklig makt vid anställning och avsked i Sverige före 1940

    Författare :Berit Bengtsson; Maths Isacson; Lars Magnusson; Bo Persson; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economic history; union power; industrial democracy; employers´organizations; article 23; collective agreements; rules of priority; organization clauses; labour exchanges; job control; collective individual action; unemployment funds; travel assistance; business cycles; Ekonomisk historia; Facklig makt; industriell demokrati; arbetsgivarorganisationer; § 23; kollektivavtal; turordningsregler; organisationsklausuler; arbetsförmedling; platskontroll; kollektiva individuella aktioner; arbetslöshetskassor; reshjälp; konjunkturer; Economic history; Ekonomisk historia; ekonomisk historia; Economic History;

    Sammanfattning : The aim of this thesis is to use a power perspective to describe the workers’ struggle for co-determination in the Swedish labour market during the period 1890–1939. The study explores how trade unions in general attempted to limit article 23, which asserted employers’ control over hiring and dismissal. LÄS MER