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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 28 for “"arc discharge"”.
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Characterization of carbon nanoclusters produced by arc-discharge
The research covered in this dissertation presents a systematic study for growth phenomena of carbon nanoclusters prepared by a arc discharge technique. Through a series of experiments, it has been found that morphology and yield of nanotubes strongly depend on the processing parameters. A low …
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Initiation of Extended Arc Discharge in ICF Reactor Dense Atmospheres
Made available in DSpace on 2017-07-06T18:42:41Z (GMT). No. of bitstreams: 3 Kislev_Hanoch_PhD.pdf: 89859370 bytes, checksum: 0ee422fb26e9bd1f2f6e2dfc62705119 (MD5) Kislev_Hanoch_PhD_ABS.pdf: 995056 bytes, checksum: 80bcb18afb277486926b085873be8f06 (MD5) license.txt: 4813 bytes, checksum: …
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Study of a low pressure arc discharge plasma enhanced nitriding reactor : application to steels, aluminium and titanium surfaces treatments
… nouveau procédé de nitruration assistée par un arc transféré. Celui-ci est basé sur une décharge d'arc à filament thermoémissif générée dans une chambre d'ionisation placée au dessus du réacteur de nitruration. Des anodes segmentées distribuées dans le réacteur permettent de créer un plasma …
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Arc-discharge In Solution: A Novel Synthesis Method For Carbon Nanotubes And In Situ Decoration Of Carbon Nanotubes With Nanoparticles
… technology based on fundamental and applied research during the last two decades. An important feature of nanotechnology is to bridge the crucial dimensional gap between the atomic and molecular fundamental sciences and microstructural scale of engineering. Accordingly, it is very important to …
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Modelling and analysis of electric arc loads using harmonic domain techniques
… goes into producing artificial light using arc discharge lamps and that global annual production of these lamps may be as much as 1.2 billion units. In the liquid steel production industry, one metric tone of steel demands, on average, 400 kW-hr and in the year 2007, the crude steel output …
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A theoretical plasma physics model of the plasmatron
… the behavior of a high pressure electric arc discharge inside the Plasmatron Fuel Reformer. The Plasmatron Fuel Reformer uses an electric arc to partially combust fuel in an internal combustion engine to increase efficiency and reduce emissions. Solutions of the conservation equations for …
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Development and Testing of a Gallium Electromagnetic (GEM) Thruster
… to characterize a gallium plasma produced by an arc discharge with current levels in the range of 5.6 - 22.6 kA. Discharge current and arc voltage measurements yield arc impedance values in the range of 6 - 7 milliohms at peak current. The absence of high-frequency oscillations in the arc voltage …
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Development and characterization of the magnetic plasmatron
… fields to hydrodynamically induce spin of the arc discharge. The proof of principle, development, design, and characterization of the device are discussed. Important parameters for fuel reforming are determined. Comparisons are made between this device and other applications of this atmospheric …
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Analyzing manufacturing methods of carbon nanotubes for commercialization
This research explores the history and structure of carbon nanotubes and the current technologies and methods available for synthesizing, purifying, and assembling carbon nanotubes. Furthermore, the current state of fabrication of carbon nanotubes has not reached a level where they can be …
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Design, analysis and validation of electrode-less plasma generator
… energy from RF and competes with a direct arc discharge method in performance, and longevity, albeit requiring a more refined control.
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Studies on a microwave dragging technique for measuring electron drift velocity
… column of an unmagnetized, low pressure, arc discharge using a microwave dragging technique based on Fizeau's famous experiment. 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 …
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Negative ion charge transfer of the reaction of S⁻ and O⁻ with atomic hydrogen producing H⁻ ions from 1500 to 10 kev
… beam was produced by a conventional hot anode arc discharge. The neutral beam was produced by a joule heated tungsten oven. Counting techniques were used in the data collection" -- Abstract, p. ii</p>
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SYNTHESIS, CHARACTERIZATION, DECORATION AND FILLING OF CARBON NANOTUBES
… and 0.4-5 µm long) were synthesized by the arc-discharge method in a He atmosphere. The nonotube samples were oxidized by burning in air and by liquid-phase oxidation using KMnO4, HNO3 and a mixture of HNO3/H2SO4 as oxidants. We approached the decoration of these oxidized tubes from two …
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Carbon thin films with enhanced properties from cathodic arc plasmas.
… using a filtered and unfiltered cathodic arcs are investigated. Firstly, the plasma properties of the filtered cathodic vacuum arc (FCVA) have been examined using planar and wire Langmuir probes in order to optimize the plasma throughput around the 90� bend. The knowledge of plasma …
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Charging of Macroparticles Ejected From a Pulsed Vacuum Arc
A pulsed vacuum arc discharge emits a plasma as well as macroparticles in the form of micron-sized molten droplets of cathode material. Due to their direction of flight and submicron to 100 mum diameter, these macroparticles often pose a contamination threat for both spacecraft-based thrusters, and …
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Simulated Material Erosion from Plasma Facing Components in Tokomak Reactors
… sources operating in the confined controlled arc discharge regime produce heat fluxes in the range expected for hard disruptions in future large tokamaks. The radiative heat flux produced inside of the capillary discharge channel is from the formed high density (10^23 - 10^27/m^3) plasma with …
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Characterization of carbon nanotubes grown by chemical vapour deposition
… The three main methods used to grow CNTs are: Arc-discharge, laser ablation (LA) and chemical vapour deposition (CVD). In the present work CNTs were grown from a mixture of camphor (C10H16O) and ferrocene (C10H10Fe) using Chemical Vapour Deposition (CVD) and argon was used as a carrier gas. The …
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Block copolymer-templated iron oxide nanoparticles for bimodal growth of multi-walled carbon nanotubes
… processes use chemical vapor deposition (CVD), arc-discharge, and laser ablation. Synthesizing carbon nanotubes via CVD typically involves depositing a thin metal film on a silicon substrate, and heating the substrate so that the thin metal film dewets and forms metallic nanoparticles. A …
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Active control of supersonic boundary layers using electric arc plasma actuators
… Plasma Jet (PPJ) and an array of Localized Arc Filament Plasma Actuators (LAFPAs), which both have shown promise for supersonic applications. The PPJ design consists of three electrodes and two circuits. One circuit is a high-voltage, trigger circuit, which creates an arc discharge between …
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Synergic control in MIG welding and penetration control in TIG welding
… time control methods) for both steady DC open arc and short circuiting arc operations have been developed in this study. These have been based on the generalised quadratic and linear ‘power-current' and linear ‘voltage-current’ equations which adequately describe the MIG welding operation. The …
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