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In-mine geoelectric investigations for detecting tectonic disturbances in coal seam structures

Gyulai Á., Dobróka M., Ormos L., Turai E., Sasvári T.

Acta Geophysica

2013

Vol. 61, no. 5

1184--1195

The methods of in-mine seam-sounding and transillumination (geoelectric tomography) for the detection of tectonic disturbances of coal seams were developed by the Department of Geophysics of the University of Miskolc in the 1970–80’s with the effective support of the former “Borsod” Coal Mines Ltd. The paper gives an overview about the theory of seam-sounding and a special geoelectric tomographic inversion, and introduces the in-mine geoelectric seam-sounding and transillumination measurement systems using vertical electrode dipoles. In the second part the paper, the results of an in-mine geoelectric measurement are presented, which was carried out in order to detect tectonic disturbances of the Miocene aged coal seams situated in Slovakia. As results of the geophysical investigation, the authors forecasted the tectonic features in the coal seam. The company confirmed the results by independent information about seam disturbances and tectonic features arising from the excavation of the investigated area.

Longitudinal flight stability control during changing the sweep-back angle of wing by neural fuzzy-control

Ormos L.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2001

z. 56[186], t.1

95-101

The stability along the three axis depends on the position of gravity centre and aerodynamic lift centre, the sweep-back angle, the temporary incidence angle of aircraft, the angle of bank, the flight speed, the altitude, the thrust power, the construction, etc. This paper includes an analysis of longitudinal stability control focused on the effects of changing sweep-back angle of wing. The applied analytic method is the catastrophe theory by Thom, which provides opportunity to realize a real-time control of longitudinal stability during the move of wings. Thom's theory is a powerful tool to describe by mathematical equations the influences of changing the sweep-back angle of wing. As these influences are changing quickly and flight situation is affected by other parameters too, so a neural control system could supervise all the effects and their causalities. The control system based on neural network can be used for communication between the different sections of aircraft. All the elementary neurons are composed into a communication system. Stability control might be made either by the pilot or the fuzzy-control. The task of fuzzy-control is to choice the suitable parameters and to modify it for setting the stability of flight.