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 30 for “"Thermal Plasma"”.
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Non-thermal plasma for water treatment
Plasma generated in contact with water has been extensively investigated in various electrode geometries and various discharge types for water treatment, of which the applications have been employed industrially on different scales. The reactive species such as OH radicals, O3, H2O2 and HO2 can be …
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Nitric oxide reduction by non-thermal plasma and catalysis
… and modifications to the SCR technology. Non-thermal plasma technique has been found to be one of the most promising technologies for NOx removal.</p><p>In the present study, a non-thermal plasma technique in the form of dielectric barrier discharge (DBD) has been extensively investigated for …
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Non-thermal Plasma Assisted Catalytic Upgrading of Low-cost Hydrocarbons
… pressure) is explored with the assistance of non-thermal plasma. This novel technology can effectively convert methane at near ambient temperature and atmospheric pressure. A methane conversion higher than 40% can be achieved over the SBA-15 catalyst. Unlike the conventional thermos-catalytic …
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Transformation of biomass to value-added chemicals through non-thermal plasma
This study explored non-thermal plasma (NTP) conversions of lignocellulosic biomass for producing biobased chemicals. Non-thermal plasma is emerging as a promising green, low-energy technology for biomass conversion, benefited by its ability to produce chemically reactive environment at mild …
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Sustainable atmospheric ammonia synthesis and nitrogen fixation using non-thermal plasma (NTP)
… level of small farms and local communities. Non-thermal plasma technology represents a promising alternative method of clean ammonia synthesis, as it circumvents the volatile operating conditions, fossil fuel use, and high capital costs of the Haber-Bosch process. In this thesis research, this …
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Theoretical study of nanoparticle formation in thermal plasma processing Nucleation, coagulation and aggregation
… in radio frequency (RF) inductively coupled plasma (ICP) reactors. The purpose is to further investigate the influence of process parameters on the final size and morphology of produced particles. The proposed model involves the calculation of flow and temperature fields of the plasma gas. …
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Experimental and numerical study of the reduction of silica in a thermal plasma reactor
… reduction behavior of SiO2 by natural gas in a thermal plasma reactor from both experimental and numerical approaches. Effects of CH4/SiO2 and plasma power input were studied by conducting experiments. Products were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The …
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Utilization of thermal plasma for conversion of thermoplastic waste to oil products in a pyrolysis reaction
… products. In this research work, direct current thermal plasma is designed and used as a heating source for a pyrolysis reaction with nearly 30 minutes residence time. Diesel range oil is produced with 59 wt % conversion yield including small traces of gasoline. The DC Thermal plasma used has …
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Study of radio frequency inductively coupled thermal plasma torch (RF ICPT) for radioactive waste treatment: thermoplastics - polyethylene and polyvinyl chloride (PVC)
… the challenges presented by such plastic RW, a thermal plasma waste treatment approach was considered. A radiofrequency (RF) inductively coupled plasma torch (ICPT) was designed in SOLIDWORKS and simulated using COMSOL Multiphysics software, and its thermal behavior was studied. Its …
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Validation and Characterization of a Laboratory Ion Source for Testing Thermal Space-Plasma Instruments
… we have developed an ion source to stimulate thermal plasma instruments in a vacuum chamber. This dissertation presents the mechanical design of the source, simulations of the potentials and charged particle trajectories in and around the source, and vacuum chamber measurements of the emitted …
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Plasma flow in the magnetosphere under the influence of large scale electric field
The plasma flow is obtained by setting up a mathematical model, using the most appropriate geomagnetic field model and adopting the idea of equivalent potential in the magnetosphere The field model consists of four components: 1) Dipole main field; 2) Dayside magnetosphere boundary current; 3) …
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Strategic Sourcing of Serial Production Processes in Jet Engine Manufacturing
… from an airfoil’s single crystal casting to thermal plasma spray coatings and wire EDM-drilled cooling holes. Many of these processes are extremely specialized, requiring special equipment, environmental controls, and expertise to produce at the precise tolerances required in aerospace. …
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Synthèse de nanoparticules de carbure de fer dans un réacteur à plasma inductif
… particles were produced by using an induction thermal plasma reactor. There are several applications for iron carbide particles in research and industry, such as in ferrofluids, magnetic recording and biosensors. We are focused in this project on its application as catalyst for Fischer-Tropsch …
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Exploring evolution of multi-ion effects and electron temperature in ICF implosions at Omega and the NIF
… both the ions and electrons within the central plasma are explored in detail. From measurements of multiple ion temperatures in shock-driven ICF implosions, it is determined that shocks couple energy directly proportional to mass in multi-ion plasmas causing the deuterons and tritons to be out …
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Thermal particle production in the early universe
… early universe which is in the state of a hot thermal plasma. Already at leading order in the gauge coupling constant multiple rescattering off soft (p ~ gT) gauge bosons has to be included which leads to nontrivial interference terms that must be taken into account. This phenomenon is known …
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Electrical Breakdown of Thermal Spray Alumina Ceramic Applied to AlSiC Baseplates Used in Power Module Packaging
Thermal spray coatings offer new alternatives in the production of electronic power modules that use alumina ceramic as an isolation layer. Current processes use direct bond copper (DBC) soldered to a nickel plated copper heat spreader. A coefficient of thermal expansion (CTE) mismatch exists …
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Optimisation of hydroxyapatite (HAp) for orthopaedic application via the chemical precipitation technique
… for orthopaedic application via the thermal plasma spray technique can therefore be prepared using the following chemical precipitation process parameters: reaction temperature 60ºC, ripening time 48h and stirring speed 1500rpm using high reagent concentrations. In the case of HAp …
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Hard X-ray diagnostics of particle acceleration and energy release in solar flares and coronal jets
… bremsstrahlung, provide direct diagnostics of thermal plasma and energetic electron populations, offering critical insights into the energy release and particle acceleration processes in these events. One part of this dissertation presents a detailed case study of two coronal jet events, …
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Wool fabric plasma treatment: resulting properties evaluation and applications in field
… come from technological transfer from research. Plasma treatment being based on a gaseous technology does not require to use many chemicals, as well as the precious resource given by freshwater. In this view, plasma treatment of textile materials appears very promising in replacing a number of …
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Auroral Ion Upflows: Sources, High Altitude Dynamics, and Neutral Wind Effects
<p>Large upwellings of thermal plasma are commonly observed in the high-latitude, topside ionosphere. These auroral ion upflows have a range of potential sources including frictional heating, electron precipitation, neutral winds, and higher-altitude density cavities. The unique signatures and …
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