Sökning: "hollow cathode"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden hollow cathode.

  1. 1. Hyperfine structure measurements in scandium for IR spectroscopy

    Master-uppsats, Lunds universitet/Astronomi; Lunds universitet/Institutionen för astronomi och teoretisk fysik

    Författare :Felix van Deelen; [2017]
    Nyckelord :Astrophysics; Atomic Data; Hyperfine Structure; Stellar Spectroscopy; Physics and Astronomy;

    Sammanfattning : Stellar abundances are important for understanding the chemical evolution of galaxies and provide us with constraints on stellar evolution and supernova nucleosynthesis. To determine stellar abundances accurately, atomic data is crucial. This data is incomplete for many elements, especially in the infrared region. LÄS MER

  2. 2. Low–voltage External Discharge Plasma Thruster and Hollow Cathodes Plasma Plume Diagnostics Utilising Electrostatic Probes and Retarding Potential Analyser

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :George-Cristian Potrivitu; [2016]
    Nyckelord :space electric propulsion; in-space advanced propulsion technology; Hall effect thruster; hollow cathode; wall-less Hall thruster; external discharge plasma thruster; single Langmuir probe; double Langmuir probe; emissive probe; retarding potential analyzer; plume plasma diagnostics; low-voltage Hall thruster; high-current hollow cathode; plasma parameters; propulsion electrique pour l espace; cathode creuse à fort courant; propulseur à décharge externe de plasma; propulseur à effet Hall à basse tension; techniques de diagnostic du plasma; sonde de Langmuir simple; sonde de Langmuir double; sonde émissive; analyseur à potentiel retardé;

    Sammanfattning : The present thesis is the result of a research period at the Institute of Space and Astronautical Science of the Japanese Aerospace Exploration Agency, ISAS/JAXA within Funaki Laboratory of the Department of Space Flight Systems that followed the path of plume plasma diagnostics for space electric propulsion drives. During the experimental studies two high-current hollow cathodes and an innovative prototype of a low-voltage fully external discharge plasma thruster (XPT) had their plasma plumes diagnosed using electrostatic probes and retarding potential analyser (RPA). LÄS MER

  3. 3. Tunable diode laser frequency stabilization and its applications in temperature measurement

    Master-uppsats, Lunds universitet/Förbränningsfysik; Lunds universitet/Fysiska institutionen

    Författare :Ali Rabbani; [2015]
    Nyckelord :Temperature measurements; Frequency stabilization; Physics and Astronomy;

    Sammanfattning : The frequency of two external cavity diode lasers tuned to the two transitions at 410 nm and 451 nm of indium are stabilized in this thesis. A hollow cathode lamp of indium atoms is used as a low pressure source of indium atoms in the locking process. LÄS MER

  4. 4. The Functionalization of Epitaxial Graphene on SiC with Nanoparticles towards Biosensing Capabilities

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologiLinköpings universitet/Tekniska fakulteten

    Författare :Carl Strandqvist; [2015]
    Nyckelord :Graphene; Epitaxial; Silicon carbide; SiC; Nanoparticles; NPs; TiO2; Fe3O4; Functionalization; Gas sensing; CO; CH2O; C6H6; NH3; Carbon monoxide; Formaldehyde; Benzene; Ammonia; WHO; Hollow cathode; plasma sputtering; AFM; XPS; Raman spectroscopy; Surface characterization; Surface potential; Biosensor; Biosensing;

    Sammanfattning : Graphene has been shown to be very powerful as a transducer in many biosensor applications due to its high sensitivity. This enables smaller surfaces and therefore less material consumption when producing sensors and concequently cheaper and more portable sensors compared to the commercially available sensors today. LÄS MER

  5. 5. Laboratory Spectroscopy of Neutral Scandium, Sc I, for Astrophysical Applications

    Master-uppsats, Lunds universitet/Astronomi; Lunds universitet/Institutionen för astronomi och teoretisk fysik

    Författare :Asli Pehlivan; [2012]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Most of the things that we know about stars come from their spectrum. The properties of the atomic lines, e.g. energy levels, wavelengths, oscillator strengths, must be known to understand the observed spectrum and to perform quantitative analyses. LÄS MER