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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TL;DR: In this article, an improvement in detection sensitivity of S2F10 in SF6 down to concentrations below 10 parts per billion, using a cryogenic enrichment gas chromatography technique, has been reported.
Abstract: Improvement in detection sensitivity of S2F10 in SF6 down to concentrations below 10 parts per billion, using a cryogenic enrichment‐gas chromatography technique, has permitted the detection of S2F10 produced by a single‐spark discharge in SF6. The spark yield of S2F10 was found to fall in the range of yields found in earlier work on more highly decomposed SF6. Based on preliminary data the spark discharge may provide a suitable and reproducible reference source of S2F10.
20 citations
29 Jun 1997
TL;DR: In this article, the author discusses the switches that have been produced in previous years and also about the switches now being produced in Russia, and discusses the switch designs, trigger schemes and so on.
Abstract: Most people dealing with pulsed power at some moment of their activity were dealing with spark switches. In Russia, there do not exist switches produced by industry. The author's Russian colleagues believe that the spark switch is a very simple device and produce switches themselves when necessary; a practice that foreign colleagues are doing the same when the switches produced by industry do not satisfy some given requirements. There exist a lot of different switch designs, trigger schemes and so on. In the paper the author discusses the switches that have been produced in previous years and also about the switches now being produced.
20 citations
Patent•
10 Feb 2004TL;DR: In this paper, an inductive pick-up is positioned adjacent to the igniter, to detect current pulses in the ignator, to infer the presence of spark, and a coil embedded in a mounting bracket is used to fasten the ignifier to the engine.
Abstract: A system for detecting spark in an igniter for a gas turbine engine. An igniter generates a plasma, or spark, somewhat similar to an automotive spark plug. In the invention, an inductive pick-up is positioned adjacent the igniter, to detect current pulses in the igniter, to thereby infer the presence of spark. The pick-up can take the form of a coil embedded in a mounting bracket which is used to fasten the igniter to the engine.
20 citations
Patent•
07 May 1982TL;DR: In this article, a multi-gap spark ignition system is described, which comprises a plurality of spark gaps which are formed in series, and the length of the spark gaps increases from the high voltage power source side towards the earth side.
Abstract: A multi-gap spark ignition system is disclosed. The system comprises a plurality of spark gaps which are formed in series. The length of the spark gaps increases from the high voltage power source side towards the earth side. According to the present invention, necessary voltage to be applied to the spark ignition system can be decreased.
20 citations
04 Nov 2015
TL;DR: A distributed SPFP algorithm based on Spark framework and improved FP-growth algorithm, which has high efficiency, cluster and flexibility, compared to the PFP algorithms based on MapReduce, the OPFP algorithmbased on Spark and original FP- growth algorithm.
Abstract: FP-growth algorithm as the representatives of non-pruning algorithms is widely used in mining transaction datasets. But it is sensitive to the calculation and the scale of datasets. When building FP-tree, the search operation as the major time-consuming operation has a higher complexity. And when the horizontal or vertical dimension of data set is larger, the mining efficiency will be reduced or even failed. To solve the above problems, reducing the complexity of search time and applying distributed computing are the widely used strategies. This paper presents a distributed SPFP algorithm based on Spark framework and improved FP-growth algorithm. The results of tests show that, compared to the PFP algorithm based on MapReduce, the OPFP algorithm based on Spark and original FP-growth algorithm, SPFP has high efficiency, cluster and flexibility.
20 citations