Topic
Spark (mathematics)
About: Spark (mathematics) is a research topic. Over the lifetime, 7304 publications have been published within this topic receiving 63322 citations.
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25 Jan 1977TL;DR: In this article, an ignition coil is constructed to have two secondary winding portions, one providing a highvoltage output and the other providing high energy level or current output, to provide a sharp voltage pulse to break down the spark gap of a spark plug.
Abstract: To provide a sharp voltage pulse to break down the spark gap of a spark plug, an ignition coil is constructed to have two secondary winding portions, one providing a high-voltage output and the other providing high energy level or current output. The high current output portion is connected through a diode to charge a capacitor which is further connected through an additional blocking diode to the spark gap, to which also the high voltage portion is connected, so that the spark gap will be supplied by a circuit common to both winding portions of the ignition coil, the high voltage pulse breaking down the spark gap and the high energy pulse, of lower voltage, however, providing spark energy for an extended period of time after initial breakdown of the gap. Preferably, the system is transistor-controlled, with the ignition instant being determined by a digital counter counting forward and reversely under control of a rotation-pulse transducer coupled to the crankshaft of the engine.
21 citations
21 citations
TL;DR: A comparative study between two classification techniques namely, Naive Bayes (NB) and the Support Vector Machine (SVM), of the Machine Learning Library (MLlib) under the Apache Spark Data processing System is presented.
21 citations
TL;DR: In this paper, a video camera was used to record the path of spark breakdowns across a positive point/plane air gap, and two images were obtained from which the path could be determined in three dimensions by subsequent computer processing and analysis.
Abstract: A video camera has been used to record the path of spark breakdowns across a positive point/plane air-gap. By using a prism as a mirror, two images were obtained from which the path could be determined in three dimensions by subsequent computer processing and analysis. Images were analyzed for each of five angular positions of the point electrode's axis, the gap remaining constant. The fractal dimension of each path was determined and found to increase slightly with the inclination of the pointed electrode. Each spark appeared to have propagated semi-randomly in a direction which included a 'memory' factor, that is, it tended to follow the previous direction while moving monotonically towards the opposite electrode. This was confirmed by an analysis of 400 spark paths which showed that each section has a specific relationship to the previous section, but that there is a wide variation around this mean which leads to the characteristic shape of a spark path. Simulations based on these results yield spark tracks which look similar to those measured and have similar fractal dimensions. These analyses strongly suggest that the development of spark paths in air is by successive steps and in a direction suggested by an angular probability distribution which is related to the field at the tip of the propagating leader.
21 citations
TL;DR: In this article, a thermalization process that depends on both localized and channelized Ohmic heating of a plasma in a spark discharge is proposed, and a satisfactory quantitative description of a spark current pulse observed in a recent experiment by Barreto, Reynolds, and Jurenka is given in terms of the proposed process.
Abstract: A thermalization process that depends on both localized and channelized Ohmic heating of a plasma in a spark discharge is proposed. A satisfactory quantitative description of a spark current pulse observed in a recent experiment by Barreto, Reynolds, and Jurenka is given in terms of the proposed process.
21 citations