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 18 of 18 for “"Electric Discharge"”.
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A unique electric discharge-excited solid state x-ray laser
A high-current discharge apparatus with a unique pulsed power supply was successfully constructed to demonstrate intense “anomalous” (exceeding direct charged-particle Bremsstrahlung) x-ray emission in the 1-2 keV range. Anomalous x-ray emission is attributed to ion implantation rather than normal …
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Atomized dielectric spray-based electric discharge machining (spray-EDM) for sustainable manufacturing
Electrical Discharge Machining is a non-traditional machining process that is widely used in the tool and die-making industry, automotive, and aerospace industries due to its ability to produce complex three-dimensional geometries with good accuracy and surface finish. Despite the aforementioned …
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Determination of Wall Thickness and Height when Cutting Various Materials with Wire Electric Discharge Machining Processes
<p>This thesis looks at the capabilities of cutting thin webs on Wire EDM machines that are difficult or impossible to machine using conventional methods. Covered is an investigation of how different material and web thickness affect the capability of machining thin-walled parts.</p> <p>Five …
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Comparing the Feasibility of Cutting Thin-Walled Sections from Five Commonly Used Metals Utilizing Wire Electric Discharge Machining
<p>Wire Electric Discharge Machining (wire-EDM) is a non-traditional machining process. Controlled electric sparks are successively used to vaporize part of a workpiece along a programmed path in order to machine a desired part. Because there is no tool that comes in direct contact with the …
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Electric oxygen-iodine laser discharge scaling and laser performance
… Illinois and CU Aerospace demonstrated the first electric discharge pumped oxygen-iodine laser referred to as ElectricOIL. This exciting improvement over the standard oxygen-iodine laser utilizes a gas discharge to produce the necessary electronically-excited molecular oxygen, O2(a1), that serves …
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A polarized helium ion beam for surface electronic structure studies
… pumping helium metastable atoms in an rf electric discharge with subsequent extraction of ions created by metastable-metastable collisions. The principles of this technique and details of the experimental apparatus are presented. Ion currents of up to 1~ A were attained and optical pumping …
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Implementation of Microwave Transmissions for Rocket Exhaust Plume Diagnostics
… of the rocket. A conductor in the presence of an electric field (e.g. near the electric charge stored within a cloud) can channel an electric discharge. The electrical conductivity of the exhaust plume is related to its concentration of free electrons. The risk of a lightning strike in-flight is a …
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Ignition of metal powder by electrostatic discharge stimulation
… sensitive to impact, friction, and electrostatic discharge, making them difficult to handle. In particular, their high electrostatic discharge sensitivity (ESD) was reported. While ESD testing is very common and standardized, the mechanisms of powder ignition by electric spark remain unclear. This …
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The impact of conventional and wide bandgap semiconductor PWM inverter EDM bearing currents on motor bearings.
… towards an electrified society, power density in electric motor drives must continue to increase. To this end, motor drives of the future will contain wide bandgap (WBG) semiconductor devices such as silicon carbide (SiC) and gallium nitride (GaN). The introduction of these WBG devices into motor …
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Chemical simulation of hydrogen generation in a plasma fuel reformer
… as a reactor where combustion is initiated by an electric discharge due to ohmic heating of the arc region. Two different types of reactors were used to model the plasmatron. The Plug Flow Reactor (PLUG) assumed a homogenous zero-dimensional closed system. The Partially Stirred Reactor (PASR) …
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Effects of a dialogical argumentation instructional model on grade 10 learners’ conceptions of lightning
… when they related lightning storms to electric discharge. The experimental group was found to be more elaborate in their explanations of the scientific nature of lightning than the control group which was not exposed to DAIM
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Novel techniques for cold/ultracold molecular collisions
… in the current setup was created by a pulsed electric discharge which induced a velocity upchirp in the excited species. Implementing a unique dual-slit chopper that can separately fix the velocities of the excited and non-excited species at the interaction region, we achieve precise control …
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Coulomb Explosion and Intense-Field Photodissociation of Ion-Beam H2+ and D2+
… in this work molecular ions were prepared by an electric discharge, providing well-defined starting conditions and allowing experiments at lower intensities. At intensities close to the threshold for Coulomb explosion (<10^14 W/cm^2), we observed a peak structure in the Coulomb explosion kinetic …
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Scientific principles for the electric oxygen-iodine laser
… to advance the scientific understanding of the electric oxygen-iodine laser (EOIL). The research reported on herein was largely conducted between the years of 2006 and 2011. The work comes on the forefront of EOIL development, recently demonstrated in 2005 with positive gain and lasing through a …
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Oxidation of waxes using microwave-generated singlet molecular oxygen
… being generated by passing oxygen through an electrical discharge-type generator. Blank runs with the electric discharge apparatus switched off, were also carried out to be able to distinguish any reaction due to the unozonised oxygen. The results showed that the singlet oxygen only reacted …
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Design and performance characterization of high power density air-cooled compact condenser heat exchangers
… are enabled by recent developments in micro-electric discharge machining to produce very high surface area compact heat exchanger devices. Air-cooled heat sinks have been identified as pivotal to the future of thermal management of microelectronics in the 21st century. Air-cooling systems …
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Charging and discharging of Lichtenberg electrets
… amount of charge onto the surface of a thin dielectric sheet to create a Lichtenberg electret that can be discharged elsewhere to form spectacular Lichtenberg figures. This study examines how the amount of charge deposited onto the surface, the geometry of the probes, and the type of material …
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Control of supersonic axisymmetric base flows using passive splitter plates and pulsed plasma actuators
… utilized energy deposition from multiple electric-arc plasma discharges placed around the base. The flow-control authority of both methodologies was evaluated with experimental diagnostics including particle image velocimetry, schlieren photography, surface flow visualization, …