Sökning: "field analysis"

Visar resultat 11 - 15 av 3474 avhandlingar innehållade orden field analysis.

  1. 11. On the existence and non-existence of a solution to the Hartree-Fock equations with an external magnetic field

    Författare :Mattias Enstedt; Igor Chueshov; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical analysis; Analys; Mathematics; Matematik;

    Sammanfattning : .... LÄS MER

  3. 12. Run-Up Transient Analysis for Salient Pole Wound Field Synchronous Motors : Field winding and power electronics implications for a smoother and cooler asynchronous start

    Författare :Roberto Felicetti; Urban Lundin; Andreas Binder; Uppsala universitet; []
    Nyckelord :apparent resistance; cable modeling; current control; transmission line model; eddy currents; field winding; frequency analysis response; Fourier Transform; impedance mismatch; main inductance; overvoltage; parasitic capacitance; partial discharge; quality factor; ringing; slew rate; stray inductance; voltage gradient; winding resonance frequency; asynchronous start; run-up; torque ripple; reluctance torque; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : Salient Pole Wound Field Synchronous Machines have better efficiency at full load than asynchronous machines of the same capability. Moreover, where asynchronous machines need inherently to draw a magnetizing current from the grid, Salient Pole Wound Field Synchronous Machines can work efficiently at unity power factor. LÄS MER

  4. 13. Exergy Analysis in Buildings : A complementary approach to energy analysis

    Författare :Marco Molinari; Folke Björk; Gudni Jóhannesson; Ivo Martinac; KTH; []
    Nyckelord :Exergy; Energy; Building systems performance; Built environment.;

    Sammanfattning : Though mandatory to be pursued, improved energy efficiency is not the only target to reach. The quality of energy has to be assessed as well. Most of the overall energy use in residential building is for low temperature heat, i.e. LÄS MER

  5. 14. Development of a Methodology for Dynamic Testing of Rock Support : Field Tests and Numerical Analysis

    Författare :Shahin Shirzadegan; Erling Nordlund; Ping Zhang; Charlie Chunlin Li; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : The increasing mining depth in the Luossavaara-Kiirunavaara Aktiebolag (LKAB) mine located in the northern part of Sweden leads to higher stress magnitudes, resulting in increased seismic activity and more seismically-induced damage. The effectiveness of various ground support systems under dynamic loading conditions has therefore become of prime interest to LKAB for successful and safe mining at deep levels. LÄS MER

  7. 15. Mediated Europes : Discourse and Power in Ukraine, Russia and Poland During Euromaidan

    Författare :Roman Horbyk; Johan Fornäs; Patrik Åker; Sabina Mihelj; Södertörns högskola; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; HUMANIORA; HUMANITIES; media; discourse; power; postcolonial theory; foreign policy; journalists; politicians; Europe; Ukraine; Russia; Poland; Euromaidan; медії; дискурс; влада; зовнішня політика; журналісти; політики; Европа; Україна; Росія; Евромайдан; medier; diskurs; makt; utrikespolitik; journalister; politiker; Europa; Ukraina; Ryssland; Polen; Euromajdan; Kritisk kulturteori; Critical and Cultural Theory; Östersjö- och Östeuropaforskning; Baltic and East European studies;

    Sammanfattning : This study focuses on mediated representations of Europe during Euromaidan and the subsequent Ukraine–Russia crisis, analysing empirical material from Ukraine, Poland and Russia. The material includes articles from nine newspapers, diverse in terms of political and journalistic orientation, as well as interviews with journalists, foreign policymakers and experts, drawing also on relevant policy documents as well as online and historical sources. LÄS MER