Sökning: "panagiotis"

Visar resultat 1 - 5 av 38 avhandlingar innehållade ordet panagiotis.

  1. 1. Hybrid Converters for HVDC Transmission

    Författare :Panagiotis Bakas; Lennart Harnefors; Staffan Norrga; Hans-Peter Nee; Stephen Finney; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-voltage direct current HVDC ; hybrid alternate-common arm converter HACC ; hybrid converters; line-commutated converters LCCs ; modular multilevel converters MMCs ; thyristors; Hybrid alternate-common-arm converter HACC ; hybrid omvandlare; högspänd likströmsöverföring HVDC ; linjekommuterade omvandlare LCC ; modulära multinivåomvandlare MMC ; tyristorer; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The line-commutated converter (LCC) and the voltage-source converter (VSC) are the two main converter technologies utilized in high-voltage direct current (HVDC) transmission applications. Depending on the application requirements, one technology might be more advantageous than the other. LÄS MER

  3. 2. Synthesis of 5'-C-phosphonomethyl, 2'-C- and 3'-C-branched nucleoside analogues as potential candidates for therapeutic intervention towards HIV

    Författare :Panagiotis Ioannidis; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Syntheses of some 5'-C-phosphonomethyl-, 2'-C- and 3'-C-branched nucleoside analogues as potential anti-HIV agents are described. Synthesis of the various nucleoside analogues is based either on the construction of a suitably protected sugar moiety that can be glycosylated with different nucleoside bases by the Vorbrüggen procedure, or on the use of a novel alcohol transposition in the carbohydrate moiety of different 2'-C- or 3'-C-methylene nucleoside analogues, using the reagent system chlorodiphenylphosphine-iodine-imidazole. LÄS MER

  4. 3. Neogene lacustrine deposits in the inland basins of northern Greece : stratigraphy, paleoenvironment, paleomagnetism and industrial usefulness

    Författare :Panagiotis Kirittopoulos; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Intensive tectonism in Neogene time created basins and mountain ranges in northern Greece with considerable topographic contrasts. The basins were successively filled with sediments up to a level of about +750 m. LÄS MER

  5. 4. Monte Carlo Results for Bootstrap Tests in Systems with Integrated-Cointegrated Variables

    Författare :Panagiotis Mantalos; Statistiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; actuarial mathematics; programming; operations research; Statistics; Granger-causality; Monte Carlo; Cointegration; Bootstrap; Statistik; operationsanalys; programmering; aktuariematematik;

    Sammanfattning : When we study the properties of a test procedure, two aspects are of prime importance. Firstly, we wish to know if the actual size of the test (i.e., the probability of rejecting the null when true) is close to the nominal size (used for calculating the critical values). LÄS MER

  7. 5. Wnt signaling in early brain development and disease

    Författare :Panagiotis Papachristou; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Wnt/Planar Cell Polarity (PCP) signaling is involved in many cellular processes throughout the development of the embryo. These include control of proliferation, differentiation, migration and cell fate decisions. Deregulation of Wnt/PCP signaling can lead to many developmental abnormalities and cancer. LÄS MER