Global ETD Search
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Showing 1 to 15 of 15 for “"Electrical Discharges"”.
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Excitation processes in the positive column of electrical discharges in inert gases
… lines emitted from low pressure positive column discharges has been studied as part of an investigation of excitation processes in these discharges. The results indicate that two-step excitation is important for many neon lines. Measurements of emission line profiles have been made using a …
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Demonstration of filament-guided electrical discharges from a high average power 1 kHz picosecond laser
… up to 1 kHz is demonstrated and the guiding of electrical discharges in air at high repetition rates is studied. The design and performance of the diode-pumped Yb:YAG chirped pulse amplification (CPA) system utilized for this experiment is also described. Diode-pumped solid state lasers in a CPA …
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BEAMED: A Bench for Automated Measurements of Electrical Discharges - A New Standard for Paschen Curves
<p>The initiation of electrical discharges, particularly glow discharges, plays a significant role in industry and environmental science, affecting systems such as electronics, power grids, and atmospheric phenomena. Despite extensive studies and applications of Paschen's law, current methodologies …
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On the identification and mitigation of life-limiting mechanisms of ionic liquid ion sources envisaged for propulsion of microspacecraft
… by two critical challenges: electrochemistry and electrical discharges. Electrochemistry-chemical reactions between the source emitter and the ionic liquid-has been shown to be capable of fully deteriorating the source in fewer than 100 h. Electrical discharges, on the other hand, can cause source …
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Altered Brain Networks In Patients with Psychogenic Non-Epileptic Seizures (PNES) Using Ultra High Field MRI
… epileptic attacks. However, they lack abnormal electrical discharges in the brain and have psychological underpinnings and causes. The gold standard of diagnosis is video-EEG which is not widely accessible, creating a poor prognosis for patients. Resting state functional magnetic resonance …
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Experimental investigation of CO2 valorization by plasma discharges
… of Power-to-X. Non-thermal plasmas generated by electrical discharges in gases are among the promising techniques for tackling this challenge. The non-equilibrium properties of plasmas can be exploited to channel energy in the molecular dissociation rather than in heating the gas, allowing …
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Rapid Mortality of Pest Arthropods by Direct Exposure to a Dielectric Barrier Discharge
… of contaminated commodities to ambient pressure electrical discharges. The arthropods are directly exposed to a 5.0 cm helium discharge with power densities on the order of 60 mW/cm3. Direct measurement of chemical species and ambient gas temperature shows the DBD treatment remains effective when …
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Stochastic Models of Surface Limited Electronic and Heat Transport in Metal and Semiconductor Contacts, Wires, and Sheets---Micro to Nano
… derive a time to electro-thermal failure through electrical discharges in the gas insulating metal electrodes. The observable parameters L and Delta are further integrated in semi-classical solutions to the electronic and thermal Boltzman transport equation (BTE), and we show roughness limited …
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Stochastic Models of Surface Limited Electronic and Heat Transport in Metal and Semiconductor Contacts, Wires, and Sheets — Micro to Nano
… derive a time to electro-thermal failure through electrical discharges in the gas insulating metal electrodes. The observable parameters L and are further integrated in semi-classical solutions to the electronic and thermal Boltzman transport equation (BTE), and we show roughness limited heat and …
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The Modeling of Partial Discharge under Fast, Repetitive Voltage Pulses Using Finite-Element Analysis
… devices are revolutionizing power electronics, electrical insulating systems are not prepared for such a revolution; without addressing insulation issues, the electronic power revolution will fail due to dramatically increased failure rates of electrification components. In this regard, internal …
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Non-thermal plasma for water treatment
… that occur at the plasma-water interface. For discharges above water, the effect of positive gas ions, which lead to the formation of positive water ions, is considered the main pathway for OH radical formation; while for the discharge under water, the water dissociation by electron collisions …
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Multi-wavelength observations of sprites over southern Africa
… range of 40 - 85 km. They are often described as electrical discharges in the mesosphere, following mostly large positive cloud-to-ground lightning discharges. Since their discovery in the late 1980s, sprites have been observed extensively in other continents except in Africa, where there is …
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Patterns of Electrical Communication Among Gymnotoid Fish
… area in Moco-moco Creek. All species produce electrical discharges which are presumably used for object location and for electrical communication. Gymnotids are active at night and inactive during the day. Some species tend to specialize on the types of daytime hiding places selected, while …
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Phenomena Associated with Individual Discharges during Plasma Electrolytic Oxidation
… information obtained from high-speed video and electrical monitoring of electrical breakdown (discharge) events during plasma electrolytic oxidation (PEO) of aluminium alloy substrates. Discharges were found to occur in extended sequences termed “cascades” at particular locations. This was a …
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Understanding the molecular-level chemistry of H2O plasmas and the effects of surface modification and deposition on a selection of oxide substrates
This dissertation first examines electrical discharges used to study wastewater samples for contaminant detection and abatement. The abatement process of contaminants in liquid discharges is relatively unstable; thus, to help elucidate the sources of instability, the gas phase constituents of …