Sökning: "Frequency Scan"

Visar resultat 1 - 5 av 34 avhandlingar innehållade orden Frequency Scan.

  1. 1. Wind Turbine Characterization by Voltage Source Converter Based Test Equipment

    Författare :Nicolas Espinoza; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Grid Integration; Frequency Scan; Discrete Control; Wind Power; Grid Emulation; Voltage Source Converter VSC ; Grid Code; Low Voltage Ride Through LVRT ;

    Sammanfattning : In countries where wind power has become a relevant part of the total generated electrical power, transmission system operators (TSOs) have included in their Grid Codes specific technical requirements for interconnection of wind power plants. Some Grid Codes demand specific testing procedures in order to verify the fulfilment for their requirements. LÄS MER

  3. 2. Long-term follow-up of adult women with urinary tract infection in childhood

    Författare :Carin Gebäck; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ambulatory blood pressure; blood pressure; chronic kidney disease; DMSA scan; glomerular filtration rate; hypertension; pregnancy; renal damage; renal function; urinary tract infection; vesicoureteral reflux;

    Sammanfattning : Acute pyelonephritis is common in young children and can lead to permanent renal damage. Renal damage increases the risk of complications such as hypertension and decreased renal function later in life. For women with renal damage there is also an increased risk of pregnancy complications. LÄS MER

  4. 3. Influence of Substrate Topography on Ink Distribution in Flexography

    Författare :Gustavo Gil Barros; Per-Åke Johansson; Gunnar Engström; Magnus Lestelius; Patrice J. Mangin; Karlstads universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; paperboard; topography; optical measurement; OptiTopo; flexography; flexo; print quality; printability; uncovered area; UCA; image analysis; frequency analysis; surface properties; paper properties; test equipment; measuring instrument; Chemical engineering; Kemiteknik; Chemical Engineering; Kemiteknik;

    Sammanfattning : The printability of paper in flexography is largely dependent on the topographical characteristics of the substrate. Topography imaging instruments make it possible to obtain three-dimensional scans of paper surfaces that can be further used to calculate valuable quality parameters. LÄS MER

  5. 4. Radiation and Scattering from Conformal Array Antennas

    Författare :Björn Thors; KTH; []
    Nyckelord :conformal antennas; antenna arrays; antenna radiation patterns; radar cross sections; electromagnetic scattering; UTD; moment methods; high frequency method; hybrid method; mutual coupling;

    Sammanfattning : This thesis deals with radiation and scattering fromconformal array antennas. A hybrid technique between the Methodof Moments (MoM) and different asymptotic methods is used forthe analysis, combining the accuracy of the MoM and theefficiency of the asymptotic methods. LÄS MER

  7. 5. Fabrication and Characterization of Aluminum Single Electron Transistors for Scanning Probes

    Författare :Henrik Brenning; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; radio frequency single electron transistor; scanning probe; charging energy; nano fabrication; noise; scanning SET; SET; cantilever; AFM; RC-product; micro mechanics;

    Sammanfattning : The main objective of the work presented in this thesis was to fabricatescanning single electron transistor probes that operate at pumped liquid heliumtemperatures. This required single electron transistors (SETs) with low resistance (R_) and relatively high charging energy (E_C), and the technology tointegrate SETs onto probes. LÄS MER