Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Cold Plasma"”.
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Cold plasma-induced quality changes in foods and beverages and plasma’s potential use in space exploration
… long shelf-life, of diverse sensory appeal. Cold plasma (non-thermally ionised gas) can reduce the negative impacts of thermal processing methods (e.g., nutritional loss, colour leaching and texture degradation), whilst also reducing microbial growth and increasing shelf-life. Cold plasma …
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The Transient-Response of Stratified Cold-Plasma to Plane Electromagnetic Waves by Analytical and Numerical Methods
Made available in DSpace on 2014-12-10T19:07:18Z (GMT). No. of bitstreams: 1 7414542.pdf: 5079727 bytes, checksum: 681dfe6be9923a69583d3701768463b1 (MD5) Previous issue date: 1974
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Adsorption Performance and Cold Plasma Activation of Biochar for On-Site CH₄ Storage and Energy Recovery in Oil Fields
… an adsorbent for capturing and storing CH₄ and cold plasma surface modification as a means of enhancing CH₄ adsorption, upgrading low-cost biomass-derived chars as effective adsorbents for such a system. CH₄ adsorption performance was measured for four biochars and compared against that of three …
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A geodesic finite-difference time-domain model of magnetized plasma
… that treats the ionosphere as a magnetized cold plasma. This opens the door to modeling electromagnetic phenomena at higher frequencies and higher altitudes by accommodating more physics. Further, a geodesic (hexagonal-pentagonal) FDTD model that is more efficient, is easier to implement, …
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The effects of moving electron density fluctuations on time domain reflectometry in plasmas
… reflectometry response of a one-dimensional cold plasma sheath are considered. Numerical solutions of the Helmholtz wave equation, which describes the electric field of a normally incident plane wave in a specified static electron density profile, are used. Included in this work is a study of …
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Earth's outer electron radiation belt : sources, losses and predictions
… are the fundamental physical parameters of a plasma, the result is a testable model that addresses elementary plasma properties. Hence, for a Maxwellian plasma, it is possible to infer the flux at any energy, not just energy channels tied to a particular instrument. In the final research study …
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Aspects of high field theory in relativistic plasmas
This thesis is concerned with plasmas and high field physics. We investigate the oscillations of relativistic plasmas using a kinetic description (Chapter II), a macroscopic fluid moment description (Chapter III), a quantum description (Chapter IV as a brief exploration) and Born-Infeld …
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Studies on a microwave dragging technique for measuring electron drift velocity
… The discharge is analyzed as if it were a cold plasma drifting with a velocity equal to the average electron drift velocity through the discharge; and to this end, an expression is developed which relates the index of refraction in the observer's coordinate system to that in the rest system …
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A cold strontium Rydberg gas
Cold gases of Rydberg atoms are an ideal system in which to study the novel effects of strong interatomic interactions. This thesis describes the design and construction of the world's first experiment to study Rydberg states in a cold gas of an alkaline earth metal, in this particular case …
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Computational analysis techniques using fast radio bursts to probe astrophysics
… including a possible deviation from the expected cold plasma dispersion relationship. The pulse features and their possible physical mechanisms are critically discussed in a bid to uncover the nature and origin of these transients.
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Test particle studies of acceleration and transport in solar and tokamak plasmas
… particle approach is used to study two distinct plasma physics situations. In the first case, the collisionless response of protons to cold plasma fast Alfven waves propagating in a non-uniform magnetic field configuration (specifically, a two-dimensional X-point field) is studied. The field …
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Mitigation of RF sheaths through design and implementation of magnetic field-aligned ICRF antenna
… or elimination of impurities introduced into the plasma during ICRF operation, particularly for tokamaks with high-Z plasma facing components (PFCs). Plasma impurities associated with ICRF auxiliary heating are universally observed [3, 4, 5, 6]. However, the underlying physics of ICRF-specific …
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Theoretical studies of the VASIMR plasma propulsion concept
… by the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) project. The VASIMR device has a magnetic mirror configuration and consists of three main components: a low energy helicon plasma source, which creates cold plasma via rf-discharge; an ion cyclotron-resonance heating (ICRH) …
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Sustainable food process engineering
… applied examples are sanitizing, packing and cold storage for fruits and vegetables. A novel sanitizing system consists of the use of cold plasma treatment, avoiding the use of chemicals to reduce microbiological contamination and increase safety. The combination of cold plasma treatment and …
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CARBON STRUCTURES AND Mg-BASED MATERIALS FOR GAS SORPTION
… the nanostructured carbon was produced in a cold plasma reactor designed in-house as additives for improving hydrogen storage properties of Mg-based materials and CO2 storage of MgO. The effects of the plasma reactor’s flow rate, temperature and power were evaluated for the formation of the …
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Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies
Electromagnetic plasma waves in the ion cyclotron range of frequencies (ICRF) are routinely used in magnetic fusion experiments to heat plasmas and drive currents. However, many experiments have revealed that wave energy losses in the plasma edge and at the wall are significant, and detected that …
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Frequency chirping of energetic particle driven modes in tokamaks; Self-consistent modelling and simulation
… chirping waves have been observed in various plasma experiments. Theoretical toy models and simulations show that the nonlinear saturation of an initially unstable plasma wave driven by energetic particles may lead to the emergence of chirping waves. In toroidal configurations, these waves can …
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Frequency chirping of energetic particle driven modes in tokamaks; Self-consistent modelling and simulation
… chirping waves have been observed in various plasma experiments. Theoretical toy models and simulations show that the nonlinear saturation of an initially unstable plasma wave driven by energetic particles may lead to the emergence of chirping waves. In toroidal configurations, these waves can …
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Shelf-Life Improvement of Distillers Wet Grains with Solubles
… days in warm summer conditions and 5-7 days in cold winter conditions. The first objective was to understand and quantify the effect of temperature (10, 20, and 25°C) and condensed distillers solubles (CDS) levels [0, 20, 30g/100g of Distillers Wet Grains (DWG)] on the shelf-life of DWGS under …
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Decontamination of food and food-processing surfaces from norovirus by cold atmospheric-pressure gaseous plasma
… on food and food-processing surfaces. Cold atmospheric pressure gaseous plasma (CAP) is one such technology that has showed strong antibacterial and antifungal effects. However, studies on virucidal activity of CAP are lacking. In this thesis, we studied the in vitro virucidal efficacy …
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