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 paper, an activity involving a parked car for estimating the surface temperature of the Sun was presented, which involved both outdoor quantitative observations and theoretical analysis, and yielded a result for the Sun within 12% of the accepted value, which can be used as an independent study project to spark students' interest and facilitate learning.
Abstract: We present an activity, involving a parked car, for estimating the surface temperature of the Sun. The activity entails both outdoor quantitative observations and theoretical analysis, and yields a result for the surface temperature of the Sun within 12% of the accepted value. It can be used as an independent study project to spark students’ interest and facilitate learning.
22 citations
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20 Mar 1993-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The spark disharge method of liquid rare-gas purification is described in this article, and physical aspects of the method are discussed, and several examples of its application are presented.
Abstract: The spark disharge method of liquid rare-gas purification is describe. The method is sufficiently more simple than those widely used. Physical aspects of the method are discussed, and examples of its application are presented.
22 citations
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TL;DR: The prediction of cycle-to-cycle variability in spark ignition engines is extremely challenging for two key reasons: (1) high-fidelity methods such as large eddy simulation are required to ac...
Abstract: Numerical prediction of cycle-to-cycle variability in spark ignition engines is extremely challenging for two key reasons: (1) high-fidelity methods such as large eddy simulation are required to ac...
22 citations
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TL;DR: In this article, an extremum seeking (ES) controller is designed to optimize and/or update VVT position and spark timing online at steady state conditions such as idle and cruise.
22 citations
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TL;DR: In this paper, a series of spark decomposition experiments of different proportions of SF6/H2O mixtures were conducted with a trace H2O injector accurately controlling H 2O content.
Abstract: Trace H2O directly participates in the SF6 decomposition generating process under spark discharge, but its mechanism remains ambiguous. Thus
, determining the influence rules of trace H2O on the decomposition characteristics of SF6 spark discharge is necessary
. Moreover, the foundation of the effective spark discharge fault diagnosis methods should be established for SF6 gas-insulated apparatus. In this paper, a series of spark decomposition experiments of different proportions of SF6/H2O mixtures were conducted with a trace H2O injector accurately controlling H2O content. Influence mechanisms of trace H2O on the effective generation rates and the characteristic ratio of spark decomposition components were determined. Results show that trace H2O remarkably influences the effective generation rates of SF6 spark decomposition components, including SOF2, SOF4, SO2F2, SO2 and CF4. The characteristic ratio varies because of the distinct mechanisms of H2O on the components. Mathematical expression between the ratio and H2O contents was also derived. In addition, the X-ray photoelectron spectra show that the solid materials contain Al2O3 and AlF3, and the existing forms of S are sulfite and sulfate.
22 citations