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 “"electrical breakdown"”.
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Reversible electrical breakdown in amorphous chalcogenides
An investigation has been made of reversible electrical breakdown in amorphous chalcogenides with particular attention being paid to the on-state properties of Si12 Te48As30Ge10 glass threshold switches. Apparatus is described for the preparation of well-characterised materials and flash-evaporated …
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Impulse electrical breakdown of high-purity water
Experiments have been conducted on the electrical breakdown of high-purity water and water mixtures. The electrical regime of interest has been carefully defined and documented to consist of electrical impulses with approximately microsecond rise time and fall time greater than 65 microseconds, on …
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The delay interval of electrical breakdown in gases
… field of sufficient magnitude to produce breakdown and the actual instant of breakdown.
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Electrical breakdown and structural characterization in synthetic resins using optical techniques
… Grid funded collaborative project on electrical breakdown in synthetic resins, various non-evasive optical techniques were developed to quantitatively characterise resin microstructure and residual internal mechanical (RIMS) and to study the physical processes occurring during …
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Electrical breakdown and luminescence from erbium oxide and Er-doped silicon thin films
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
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Electrical Breakdown of Thermal Spray Alumina Ceramic Applied to AlSiC Baseplates Used in Power Module Packaging
… causes the coatings to have a lower dielectric breakdown voltage and a higher leakage current at normal operating voltages. This problem can be eliminated by manufacturing the electronic power modules in a controlled environment and packaging the devices in a hermetically sealed package. This …
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Kerr electro-optic measurements for electric field and space charge distributions using similar and dissimilar electrode pairs
The electrical breakdown strength of insulating materials is a major limiting factor of reliability in electric power, medical devices, and other high electric field applications. Electrical breakdown strength increase results in increased reliability and energy storage in high voltage capacitors …
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A model for the initiation and propagation of electrical streamers in transformer oil and transformer oil based nanofluids
… power apparatus cooling is due to their greater electrical breakdown strength and thermal conductivity than gaseous insulators, while their ability to conform to complex geometries and self-heal means that they are often of more practical use than solid insulators. Transformer oil is a …
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Optimisation of silicone-based dielectric elastomer transducers by means of block copolymers – synthesis and compounding
… exceeds elastic stress in the presence of an electrical field, resulting in contraction in thickness and planar expansion in the area. As well as an actuator, dielectric elastomers can be used as generators and sensors. As a dielectric elastomer, silicones have been used extensively in many …
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Development of quantitative techniques for the study of discharge events during plasma electrolytic oxidation processes
… Two methodologies for the quantitative study of electrical breakdown (discharge) events observed during plasma electrolytic oxidation processes were developed and are described in this work. One method presented involves direct measurement of electrical breakdowns during production of an oxide …
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Lightning impulse tests on air-breakdown level in point-plane electrode configuration
… the fundamental characteristics of the electrical breakdown. Breakdown voltage is a phenomenon where the quantity of an electrical force is required to transform the electrical properties of an object. Many factors that lead to the breakdown voltage are still not fully discovered. These …
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Charge transport and breakdown physics in liquid/solid insulation systems
Liquid dielectrics provide superior electrical breakdown strength and heat transfer capability, especially when used in combination with liquid-immersed solid dielectrics. Over the past half-century, there has been extensive research characterizing "streamers" in order to prevent them, as they are …
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Charging and discharging of Lichtenberg electrets
… to diagnose lightning strike victims, to analyze electrical breakdown of insulating materials, for artistic purposes, and for similar applications where pulsed capacitors are commonly used.</p>
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Mechanisms for triggering high-voltage breakdown in vacuum
The electrical and optical characteristics of a cylindrical alumina insulator (94% Al203) have been measured under ultra-high vacuum (P < 10-8 mBar) conditions. A high-resolution CCD camera was used to make real-time optical recordings of DC prebreakdown luminescence from the ceramic, under …
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Elucidating the mechanisms behind pre-breakdown phenomena in transformer oil systems
… power apparatus cooling is due to their greater electrical breakdown strength and thermal conductivity than gaseous insulators. In addition, their ability to conform to complex geometries and self-heal means that they are often of more practical use than solid insulators. Unfortunately, as with …
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Keer electro-optic measurements in liquid dielectrics
… space charge distribution pattern and impulse breakdown voltage is examined. Hypothetically, bipolar homo-charge injection with reduced electric field at both electrodes may allow higher voltage operation without insulation failure, since electrical breakdown usually initiates at the …
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Studies of dielectric breakdown under pulsed power conditions
… for compact pulsed power applications, the electrical breakdown strength (BDS) of ceramic dielectrics, particularly titanium oxide and ceramic/epoxy composite materials, are being characterized and studied. Results of research to-date show that the dense titania ceramics with nanocrystalline …
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Electrical and thermal characterization techniques for carbon nanotube transistors and networks
… and backward DC gate voltage sweeps. A pulsed electrical breakdown technique to increase the ION/IOFF ratio of carbon nanotube random network transistors is also demonstrated. The ratio is increased by three orders of magnitude, with minimal reduction in ION (< 50%). It is shown that adsorbed …
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EM field effects on the surface of polluted HV insulators
… Chapter 6 describes an experimental study of electrical breakdown at the edges of sessile water droplets on a PE surface subject to ac electrical stress up to of 2.0MV/m at 50 Hz. The study involves observing the motion of water droplets using a high-speed video camera operating at 3000 frames …
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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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