Sökning: "Vector measurements"

Visar resultat 1 - 5 av 107 avhandlingar innehållade orden Vector measurements.

  1. 1. Vector Measurements for Wireless Network Devices

    Författare :Efrain Zenteno; Peter Händel; Magnus Isaksson; Kristoffer Andersson; Högskolan i Gävle; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vector measurements; radio frequency; synthetic instrumentation; bandwidth extension; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

    Sammanfattning : Wireless networks are an iconic technology of today’s modern era, theyare present in our daily activities as can be exemplified by cellular communications,wi-fi, bluetooth, and others. Vector measurements play an importantrole in the design, simulation, and testing of wireless networks and are usedto characterize key devices operating in the radio interface, such as amplifiers,filters, and mixers. LÄS MER

  2. 2. Studies of vector tomography

    Författare :Kent Stråhlén; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Doppler tomography; Doppler Radon transform; local tomography; vectorial k-plane transform; vectorial Radon transform; k-plane transform; Radon transform; tomography; vector tomography; Mathematics; Matematik;

    Sammanfattning : The motivation to study the kind of problems appearing in this thesis has been ultrasound measurements of flows, from which velocity spectra along lines can be determined. These velocity spectra can mathematically be described by a new non-linear transform, here called the Doppler Spectral Transform (DST). LÄS MER

  3. 3. Grid-Connected Voltage Source Converter - Control Principles and Wind Energy Applications

    Författare :Jan Svensson; Chalmers University of Technology; []
    Nyckelord :wind turbine; voltage source converter; voltage angle control; frequency response; vector current control; grid-connected; forced-commutated; measurements;

    Sammanfattning : The thesis focuses on a forced-commutated voltage source converter (VSC) connected to a grid in a wind energy application. The work consists of four parts. The first part addresses the type of electrical system which should be used in a wind turbine. LÄS MER

  4. 4. THz Vector Beam Measurement System for APEX Instrument SHeFI and Microwave Cryogenic Low Noise Amplifier Design

    Författare :Olle Nyström; Chalmers University of Technology; []
    Nyckelord :vector measurements; mm- and submm-wave optics; LNA; radio astronomy; cryogenic amplifier; APEX; InP HEMT; Gaussian beam;

    Sammanfattning : This licentiate thesis describes results of the author’s work on development of THz vector beam measurement system and microwave cryogenic low-noise amplifier.The first part, and the main focus, of the thesis covers the vector beam measurement system for frequency range 210-500 GHz developed to characterize/verify the cold opticsof the APEX instrument SHeFI. LÄS MER

  5. 5. Top quark and heavy vector boson associated production at the ATLAS experiment : Modelling, measurements and effective field theory

    Författare :Olga Bessidskaia Bylund; Jörgen Sjölin; Sten Hellman; Stéphanie Beauceron; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Physics; fysik;

    Sammanfattning : The Standard Model (SM) of particle physics describes the elementary particles that constitute matter and their interactions. The predictions of the SM have been confirmed by numerous experimental results. LÄS MER