Sökning: "zero-crossing time"

Hittade 4 avhandlingar innehållade orden zero-crossing time.

  1. 1. My first-passage : target search in physics and biology

    Författare :Markus Nyberg; Ludvig Lizana; Martin Rosvall; Carlos Mejia-Monasterio; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; first-passage; mean first-passage time; mean first-arrival time; random walk; diffusion; zero-crossing; persistence; survival probability; network; resetting; teoretisk fysik; Theoretical Physics;

    Sammanfattning : Random walks and diffusing particles have been a corner stone in modelling the random motion of a varying quantity with applications spanning over many research fields. And in most of the applications one can ask a question related to when something happened for the first time. That is, a first-passage problem. LÄS MER

  3. 2. Features and Origin of Electromagnetic Fields Generated by Lightning Flashes

    Författare :Mohd Muzafar Ismail; Vernon Cooray; Farhad Rachidi; Uppsala universitet; []
    Nyckelord :negative cloud-to-ground lightning flashes; HF and VHF radiation; chaotic pulse trains; lightning initiation; zero-crossing time; electromagnetic fields; Engineering Science with specialization in Atmospheric Discharges; Teknisk fysik med inriktning mot atmosfäriska urladdningar;

    Sammanfattning : Negative cloud-to-ground (CG) lightning flashes transport negative charge from cloud to ground. Negative ground flashes typically involve various processes identified as preliminary breakdown, stepped leader, return stroke, dart leader, dart-stepped leader, subsequent return stroke, and cloud activity between strokes, such as regular pulse trains and chaotic pulse trains. LÄS MER

  4. 3. High frequency distortion in power grids due to electronic equipment

    Författare :Anders Larsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Power Engineering; Elkraftteknik; Energiteknik; Energy Engineering;

    Sammanfattning : Power quality is a subject that has received a lot of attention during the last 10 to 20 years, both in industry and in academia. Power quality concerns interaction between the power grid and its customers and between the power grid and equipment connected to it, reflected in voltages and currents. LÄS MER

  5. 4. Fast fault detection for power distribution systems

    Författare :Magnus Öhrström; KTH; []
    Nyckelord :fast fault detection; power systems;

    Sammanfattning : The main topic of this licentiate thesis is fast faultdetection. The thesis summaries the work performed in theproject“Fast fault detection for distributionsystems”.In the first chapters of the thesis the term“fast”is used in a general manner. LÄS MER