Sökning: "High-voltages"

Visar resultat 1 - 5 av 18 avhandlingar innehållade ordet High-voltages.

  1. 1. High Power Microwave Sources : design and experiments

    Författare :Cecilia Möller; Nils Brenning; Stefan Silfverskiöld; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space physics; Rymdfysik; Plasma physics; Plasmafysik;

    Sammanfattning : High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents. This thesis presents results from experiments with a narrow band HPM source, the vircator. LÄS MER

  3. 2. Design and Experiments with High Power Microwave Sources : The Virtual Cathode Oscillator

    Författare :Cecilia Möller; Nils Brenning; Stefan Silfverskiöld; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High Power Microwaves Vircator;

    Sammanfattning : High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents.This thesis presents results from simulations and experiments with a narrow band HPM source, the vircator. LÄS MER

  4. 3. Inductive Pulse Generation

    Författare :Adam Lindblom; Hans Bernhoff; Jan Isberg; Anders Larsson; Owen Farish; Uppsala universitet; []
    Nyckelord :Technology; Pulsed Power; Inductive Pulse Generator; High Voltage; Semicon; XLPE; TEKNIKVETENSKAP; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Pulsed power generators are a key component in compact systems for generation of high-power microwaves (HPM). HPM generation by virtual cathode devices such as Vircators put high demands on the source. The rise time and the pulse length of the source voltage are two key issues in the generation of HPM radiation. LÄS MER

  5. 4. Combining Electrochemistry and Photoelectron Spectroscopy for the Study of Li-ion Batteries

    Författare :Ida Källquist; Maria Hahlin; Håkan Rensmo; Laurent Duda; Kristina Edström; Hendrik Bluhm; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Li-ion battery; battery interfaces; electrochemistry; electrochemical potential; photoelectron spectroscopy; operando; ambient pressure photoelectron spectroscopy;

    Sammanfattning : In this thesis photoelectron spectroscopy (PES) is combined with electrochemistry to investigate the electrochemical processes that occur at the electrode/electrolyte interfaces in lithium-ion batteries (LIBs). LIB systems are studied by the use of both ex situ PES, where electrodes are electrochemically pre-cycled and subsequently measured by PES, and operando PES, where electrodes are cycled during PES measurements. LÄS MER

  7. 5. Transient Response of Grounding Systems Caused by Lightning: Modelling and Experiments

    Författare :Yaqing Liu; Rajeev Thottappillil; Carlo Alberto Nucci; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Grounding system; Lightning protection; Electromagnetic Compatibility; Transient analysis; Soil ionization; Transmission line approach; Elektroteknik; Electrical engineering; Elektroteknik;

    Sammanfattning : In order to achieve better lightning protection and electromagnetic compatibility (EMC) requirements, the needs for a proper grounding system and the knowledge of its transient behaviour become crucial. The present work is focused towards developing engineering models for transient analysis of grounding system with sufficient accuracy and simplicity for lightning studies. LÄS MER