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High-Speed PLIF Imaging for Investigation of Turbulence Effects on Heat Release Rates in HCCI Combustion

High-speed laser diagnostics was utilized for single-cycle resolved studies of the fuel distribution in the combustion chamber of a truck-size HCCI engine. A multi-YAG laser system consisting of four individual Nd:YAG lasers was used for planar laser-induced fluorescence (PLIF) imaging of the fuel distribution. The fundamental beam from the lasers at 1064 nm was frequency quadrupled in order to ob

Modeling spike and drops dependence in european electricity markets

Electricity and gas prices are characterized by sharp increases or decreases in their price, followed a few days later by an equally large decreases or increases. These phenomena are called spikes or drops and are causing headaches for system developers and planners. One of the explanations for the spikes are sudden increases in demand (eg cold weather) and/or decreases in supply (eg emergency shu

Stochastic Theory of Continuous-Time State-Space Identification

This paper presents theory, algorithms, and validation results for system identification of continuous-time state-space models from finite input-output sequences. The algorithms developed are methods of subspace model identification and stochastic realization adapted to the continuous-time context. The resulting model can be decomposed into an input-output model and a stochastic innovations model.