Sökning: "eddy currents"

Visar resultat 31 - 35 av 37 avhandlingar innehållade orden eddy currents.

  1. 31. The thermohaline circulation during the Last Glacial Maximum and in the Present-Day climate

    Författare :Maxime Ballarotta; Kristofer Döös; David Stevens; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ocean model; circulation; LGM; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Sammanfattning : The thermohaline circulation (THC) corresponds to the large time- and spatial-scales ocean circulation associated with the transport of heat and salt, and is known to be an important factor controlling the climate variability. The large scales involved in the THC make it difficult to observe, and therefore the synergy of numerical models and climate proxy reconstructions is particularly relevant to study the characteristics of this circulation in the present and past climates. LÄS MER

  3. 32. Permanent magnet motor drives with switched stator windings

    Författare :Eckart Nipp; KTH; []
    Nyckelord :;

    Sammanfattning : Permanent magnet (PM) motors aretoday regarded as aninteresting solution for a wide range ofinverter-fedvariable-speed drives. The generally increasedinterest in these motors hasled to many investigations on theirfeasibility for vehicle propulsion. LÄS MER

  4. 33. Optimisation in strategies in diffusion tensor MR imaging

    Författare :Stefan Skare; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Diffusion tensor; magnetic resonance imaging; optimisation; artefacts;

    Sammanfattning : With diffusion MR imaging, the Brownian motion (or self-diffusion) of water molecules is measured. In the corresponding ADC (Apparent Diffusion Coefficient) image, each image element (voxel) represents the average diffusion. In MRI, the diffusion is measured with diffusion gradients along certain directions in space. LÄS MER

  5. 34. Multilayered Coreless Printed Circuit Board (PCB) Step-down Transformers for High Frequency Switch Mode Power Supplies (SMPS)

    Författare :Radhika Ambatipudi; Kent Bertilsson; Bengt Oelmann; Torbjörn Thiringer; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multilayered Coreless PCB transformers; High frequency converters; Electrical engineering; Elektroteknik; Electronics; Elektronik;

    Sammanfattning : The Power Supply Unit (PSU) plays a vital role in almost all electronic equipment. The continuous efforts applied to the improvement of semiconductor devices such as MOSFETS, diodes, controllers and MOSFET drivers have led to the increased switching speeds of power supplies. LÄS MER

  7. 35. Analysis of Losses in Inverter-fed Synchronous Machines with Salient-pole Solid Rotors

    Författare :Samer Badie Shisha; Chandur Sadarangani; Peter Tavner; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric power engineering; Elkraftteknik;

    Sammanfattning : The work that is presented here considers loss analysis of inverter-fed field-excited synchronous machines. The project was initiated, as a co-operation between indus­trial partners and KTH, with the aim of providing knowledge about the losses that take place in inverter-fed large scale synchronous machines. LÄS MER