We combine Very-Long-Baseline Interferometry (VLBI) data for ∼ 100 active galactic nuclei (AGN) available from the Very Large Baseline Array (VLBA) 2 cm imaging survey and optical spectroscopy to investigate the relationships in the emission-line region–central engine–radio jet system. Here, we present the diversity of spectral types among the brightest AGN in our sample. We also discuss correl...

Specific objectives of the research at United Technologies Research Center (UTRC) are as follows: (1) Develop methods and tools for uncertainty management in non-linear non-equilibrium models of wave phenomena in the jet engines. (2) Develop methods and tools for parameter identification and model validation techniques for nonlinear non-equilibrium models of wave phenomena in the jet engines. (...

This paper introduces the Simulated Jet Engine Bracket Dataset (SimJEB): a new, public collection of crowdsourced mechanical brackets and accompanying structural simulations. SimJEB is applicable to wide range geometry processing tasks; complexity shapes in offer challenge automated cleaning meshing, while categorical labels simulations facilitate classification regression (i.e. engineering sur...

Application of novelty detection to a new class of jet engine is considered within this paper, providing a worked example of the steps necessary for constructing a model of normality. Abnormal jet engine vibration signatures are automatically identified with respect to a training set of normal examples. Pre-processing steps suitable for this area of application are investigated. An intuitive me...

The two leading interpretations of achromatic breaks that are observed in the light curves of GRBs afterglow are (i) the manifestation of the edge of a jet, which has a roughly uniform energy profile and a sharp edge and (ii) a line of sight effect in jets with a variable energy profile. The first scenario requires the inner engine to produce a jet with a different opening angle each explosion,...