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The movement investigation of an axisymmetric rotation body under the action of electromagnetic fields

Hrevtsev O., Selivanova N., Popovych P., Poberezhny L., Shevchuk O., Hrytsuliak G., Poberezhna L.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 103, nr 2

67--77

EN

Purpose: To ensure an adequate level of accuracy, it is rational to study the ponderomotor forces of the ring, which drive a hollow disk of variable thickness, hung on the ring. Design/methodology/approach: The solution of the motion problem of a hollow disk of variable thickness suspended on a force ring of rectangular cross section is based on the method of solving the equations of the theory of thermoelasticity. The stress-strain state, as well as the motion of the specified body of rotation, the disk, in studies in a cylindrical coordinate system, under the action of ponderomotor forces. Findings: The motion equation of a hollow disk hung on a force ring-torus is made, exact solutions of the motion equations of a ring in the torus form of rectangular cross section are found. New component expressions of ponderomotor forces, which appear from the action of the ring's own electromagnetic field and cause the motion of a hollow disk, have been found on the basis of Maxwell's equations. It is proved that at high speeds and low natural accelerations the stress - strain state of the disk material does not cause the destruction of the structure. Research limitations/implications: Calculations of ponderomorphic forces are valid for the ring, which drives a hollow disk of variable thickness, hung on the ring. Practical implications: It is proved that at high velocities and small natural accelerations the stress-strain state of the disk medium does not cause structural damage. It is determined that the rotation in the direction of movement at an angle of 90 degrees changes only the direction of the acceleration vector without increasing its value. Originality/value: The dependences between own time and coordinate time are formulated. It is proved that a small change in the natural time for the studied disk can significantly change the coordinate time, and the pulsed electromagnetic field provides the ability to cover infinitely large distances over finite periods of time.

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Recent Seismic Electric Signals (SES) activities in Greece

Varotsos P.

Acta Geophysica

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2006

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Vol. 54, no. 2

158-164

EN

Quite recently two intense Seismic Electric Signals activities were recorded at Pirgos station in western Greece. They have been followed by two strong earth-quakes with magnitudes 6.1 and 6.9 that occurred in western Greece and southern Greece; the latter is the strongest earthquake that occurred in Greece during the last two decades. The compatibility of these results with some relationship between selectivity and earthquake focal mechanism suggested by Uyeda et al. (1999) is discussed.

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Additional evidence on some relationship between seismic electric signals and earthquake source parameters

Varotsos P., Sarlis N., Skordas E., Tanaka H., Lazaridou M.

Acta Geophysica Polonica

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2005

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Vol. 53, nr 3

293-298

EN

We provide recent experimental evidence which further supports the inter-relation between the earthquake source parameters and the selectivity properties of Seismic Electric Signals. The cases of two major earthquakes with magnitudes larger than 6.0, that occurred in Greece during 2004-2005, are presented.

4

SES activity recorded at Keratea station on April, 2003

Varotsos P., Sarlis N., Skordas E., Lazaridou M.

Acta Geophysica Polonica

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2004

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Vol. 52, nr 1

45-48

EN

Two notes on the seismic electric signals recorded at the Keratea station, Greece, are presented. Both these signals as well as the subsequent seismic activ-ity have been analysed in the natural time domain. They have been finally fol-lowed by a 4.7 earthquake on June 13, 2003 with an epicenter at 38.6N, 23.7E (i.e., around 65 km north of Athens).

5

Four notes on SES activity at the Ioannina Observatory, Greece

Varotsos P., Sarlis N., Skordas E., Lazaridou M.

Acta Geophysica Polonica

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2003

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Vol. 51, nr 2

147-153

EN

Four notes are presented on the seismic electric signals recorded at the Ioannina Observatory, Greece and their relation to the seismicity of the area. The motes were issued between November 2, 2002 and January 12, 2003.

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Seismic electric signals and seismicity: on a tentative interrelation between their spectral

Varotsos P., Sarlis N., Skordas E.

Acta Geophysica Polonica

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2002

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Vol. 50, nr 3

337-354

EN

We show that the spectral content of the seismic activity, in the area candidate to suffer an earthquake and which evolves consecutively in time with every new event, falls on the spectral content of the Seismic Electric Signals (SES) activity, just before the occurrence of the main shock. The key point is that both spectra have to be defined and calculated in a new time domain, termed as "natura1" time. Thus, since the spectrum of the SES is known well in advance, the continuous inspection of the spectrum of the evolving seismic activity may lead to an estimation of the time window of the impending main shock with an accuracy of around a few days. Both spectra exhibit a feature compatible with that obtained from the theory of dynamic phase transitions (critical phenomena).