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 15 of 15 for “"spark gap"”.
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Spark Gap
"Spark Gap" is an invisible electrical force made visible in spaces between things. This usually describes the space of air between two conductors; a non-conductive gap in an otherwise complete electric circuit, across which a quick luminous disruptive electrical discharge occurs. This interstitial …
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Advancing high power microwave spark-gap technology : design and analysis of a coaxial ringdown oscillator
… such as switched oscillators (SOs), rely on spark-gap switches that underperform in voltage thresholds, limiting their range and effectiveness. Coaxial ringdown oscillators (CROs), a variation of SOs, operate within a coaxial geometry to generate high-power electromagnetic pulses. Current CRO …
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Development of pulsed power sources using self-sustaining nonlinear transmission lines and high-voltage solid-state switches
… number of required components. Traditionally, spark gap switches have been predominantly utilized in direct HV switch-based pulser. High voltage withstanding capability and high current carrying capability of the spark gap switches solidified their position during the early stages of pulsed …
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Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications
… used in the solid-state domain. While gas spark gap switches can supply high power, they cannot be turned off when engaged. Solid-state switches on the other hand can, and when integrated into the LTD topology, these switches can operate like their spark gap peers. Even better, solid-state …
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Advanced Ignition Strategies for Future Internal Combustion Engines with Lean and Diluted Fuel-Air Mixtures
… this research was to study the mechanisms of the spark ignition process of lean or diluted fuel-air mixtures under enhanced gas flow conditions for applications in future internal combustion engines. Various spark ignition strategies were deployed by controlling the spark discharge process via …
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Effect of chromium (cr) particle size and span-20 surfactant on Aisi d2 hardened steel using electrical discharge machining
… particles are added into the tank then the spark gap is filled up with these additives particles. These electrically conductive powder particles reduce the insulating strength of dielectric fluid and increase the spark gap distance between tool electrode and workpiece, which due to this EDM …
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New approaches for optical and microoptical diagnostics in IC engines
… of modern engine concepts like spray-guided spark-ignition direct injection (SG-SIDI) or homogeneous charge compression ignition (HCCI) requires fast, non-invasive in-situ diagnostics methods. Hence, laser-based optical diagnostics are essential for internal combustion (IC) engine research. …
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Effects of GIC Neutral Blocking Devices (NBDs) on transmission lines protection performance and potential for resonance
… to avoid over-voltages by providing a backup spark-gap for MOV devices.
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Modification and Numerical Modelling of Dense Plasma Focus Device
… a 1.3 uF capacitor and operated at 40 kV pulse. Spark gap switch SG181-C is integrated into the driver circuit to handle high current operations. Bus work is designed and modeled to predict the current waveform generated by the modified DPF. The control system is designed to be suitable for …
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Study of an internal combustion engine to burn hydrogen fuel and backfire elimination using a carburetor fuel delivery method
… less expensive methods, such as employing cold spark plugs with reduced spark gap and low temperature cooled valves along with the introduction of water vapor to the mixture. In the experiments, the internal combustion engine was tested for two fuels: (i) octane 95 gasoline, and (ii) gaseous …
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Pulsed ring-down antennas for implementation in a phased array
… the results in the far field such as capacitive spark gap loading and other capacitive storage methods. Utilizing the pulsed ring-down antenna model, we are able to give a better characterization of mesoband pulsed ring-down structures for implementation into a specific or multi-purpose phased …
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Nanosecond pulse discharges in electronegative gases
… as f i l l i ng gases in a uniform-field spark gap subjected to highly overvolted nanosecond pulses. The electrode separation is 1 cm. U.V. radiation is applied prior to the arrival of the pulse to the gap. In C2Fg-Ar mixtures the pressure ranges from 500 Torr to 960 Torr and the …
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Ultra-Wideband Transceiver Design And Optimization
… MHz. The first radio designed by Marconi using spark-gap transmitters was an impulse radio (IR). The IR UWB technology boasts of low power, low cost, high data rates, multiple channels, simultaneous networking, the ability to carry information through obstacles that more limited bandwidths …
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Generátor napěťových impulsů vysoké úrovně
Tato práce se zabývá problematikou generování napěťových impulsů vysoké úrovně. V rámci práce jsou nejprve popsány tvary jednotlivých impulsů, dále je znázorněno blokové schéma generátoru napěťových impulsů a v teoretickém rozboru jsou teoreticky rozebrány možnosti řešení jednotlivých bloků.
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Distance Protection Aspects of Transmission Lines Equipped with Series Compensation Capacitors
In order to meet the high demand for power transmission capacity, some power companies have installed series capacitors on power transmission lines. This allows the impedance of the line to be lowered, thus yielding increased transmission capability. The series capacitor makes sense because it's …