Sökning: "test charge response"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden test charge response.

  1. 1. Test Charge Response of a Dusty Plasma with Grain Size Distribution and Charging Dynamics

    Författare :Muhammad Shafiq; Michael A. Raadu; Jens Juul Rasmussen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dusty plasmas; Complex plasmas; Grain size distribution; Grain charging dynamics; Lorentzian distribution; Kappa distribution; Test charge response; Delayed shielding; Energy loss; Drag force; Wake field.; Plasma physics; Plasmafysik;

    Sammanfattning : This doctoral thesis reports analytical and numerical results for the electrostatic response of a dusty plasma to a moving test charge. Two important physical aspects of dusty plasmas, namely grain size distribution and grain charging dynamics were taken into account. LÄS MER

  3. 2. Dusty plasma response to a moivng test charge

    Författare :Muhammad Shafiq; Michael A. Raadu; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Dusty Plasmas; Complex Plasmas; Grain size distribution; Grain charging dynamics; Fysik; Physics; Fysik;

    Sammanfattning : This licentiate thesis reports analytical results for the electrostatic response to a test charge moving through dusty plasma. Two particular cases for a slowly moving test charge, namely, grain size distribution and grain charging dynamics are considered. LÄS MER

  4. 3. Partial discharges studied by dielectric response method

    Författare :Xiangdong Xu; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; frequency domain spectroscopy; AWIS; partial discharge excess current; dielectric characterization; partial discharge; non-PD excess current;

    Sammanfattning : The increasing demand of integrating various renewable energy recourses in power system requires extensive use of power electronic solutions, which allows energy conversion between different frequencies and stabilizes the system. Consequently, other than the traditional 50/60 Hz sinusoidal voltage stresses act on the high voltage insulation systems. LÄS MER

  5. 4. Development of techniques for measurements of shock wave response and moisture content in granite

    Författare :Dan Tilert; Lars Mattsson; Mikael Sjödahl; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrial engineering and economy; Industriell teknik och ekonomi;

    Sammanfattning : For measuring small, fast deformations on a micrometre scale optical methods are common. Various forms of interferometry are available, and holography is another possibility. However, if there are complications such as limited space and hazardous environments special demands arise. LÄS MER

  7. 5. Characterization of Electrical Insulation Exposed to Arbitrary Voltage Waveforms

    Författare :Björn Sonerud; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; arbitrary voltage waveforms; partial discharge; diagnostics; dielectric response measurement; signal processing; electrical treeing; dielectric heating.;

    Sammanfattning : The extensive use of power electronics in power systems today gives rise to other voltage waveforms than the conventional 50/60 Hz sinusoidal and consequently other types of electric stress act on high voltage insulating materials. Previous studies has shown that Pulse Width Modulated (PWM) voltages and similar waveforms increase stress in Adjustable Speed Drives (ASD) as compared with sinusoidal waveforms and it has also been shown that partial discharge (PD) activity is intensified during PWM voltages and that rise time of square like pulses affect PD inception voltage. LÄS MER