Sökning: "main"

Visar resultat 26 - 30 av 14964 avhandlingar innehållade ordet main.

  1. 26. New C-C coupling Reactions Enabled by Main-group Organometallics

    Författare :Kilian Colas; Abraham Mendoza; David Procter; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C-C coupling; organometallics; aluminum; magnesium; Grignard; turbo-Hauser-bases; piperazines; sulfur; ketones; organisk kemi; Organic Chemistry;

    Sammanfattning : The carbon-carbon bond has always been at the very core of chemical research. Strategies for the creation of C−C bonds are one of the keys to the construction game that organic chemists play with the building blocks provided by Nature, with the ultimate goal of producing useful molecular structures that will serve society as medicines, materials, imaging tools, catalysts, and ligands (to mention but a few). LÄS MER

  3. 27. 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. 28. Voltage Transients in the Field Winding of Salient Pole Wound Synchronous Machines : Implications from fast switching power electronics

    Författare :Roberto Felicetti; Urban Lundin; Jon Kjellin; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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;

    Sammanfattning : Wound Field Synchronous Generators provide more than 95% of the electricity need worldwide. Their primacy in electricity production is due to ease of voltage regulation, performed by simply adjusting the direct current intensity in their rotor winding. LÄS MER

  5. 29. Input och output : Ordföljd i svenska barns huvudsatser och bisatser

    Författare :Christian Waldmann; Christer Platzack; Marit Westergaard; tolkning i offentlig sektor och översättning danska och isländska Avdelningen för svenska; []
    Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; språkinlärning; input; syntaktiska ledtrådar; frekvens; funktionella kategorier; ordföljd; verbplacering; verbflyttning; subjunktion; huvudsats; bisats; V2; Svenska språket Nordiska språk; Swedish; syntactic cues; input; frequency; functional categories; word order; verb placement; verb movement; complementizers; main clauses; embedded clauses; verb second; language acquisition;

    Sammanfattning : .... LÄS MER

  7. 30. Construction transport efficiency from the perspective of Main Contractor and Transporter

    Författare :Farah Naz; Anna Fredriksson; Linea Kjellsdotter Ivert; Johan Woxenius; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Construction transport efficiency; Performance measures; Construction logistics management; Case study;

    Sammanfattning : Transport efficiency within construction is low. One reason behind the lack of efficiency within the construction transport is the lack of proper logistics management that in turn results in problems of delivery reliability, material flows as well as material availability. LÄS MER