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C.T. Dervos, P.D. Bourkas, C.A. Kagarakis, N.K. Uzunoglou, "Millimetre wavelength radiation during dielectric ageing", International Journal of Infrared and Millimetre Waves, Vol.11, No.1, January 1990.
P.D. Bourkas, I.A. Stathopoulos, F.V. Topalis, "Breakdown of the pressboard-oil insulating under repeates stress by impulse voltages", Energy Systems, Vo1.10, No.l, pp.24-27, 1990.
I.A. Stathopoulos, P.D. Bourkas, T. Katsambekis, "Man in a power frequency electric field", Energy Systems, Vo1.10, 1Vo.2, pp.99-102, 1990.
N.J. Theodorou, A. Kanellakis and S. Tzafestas, "New Criteria for the Absence of Limit Cycles in Two-Dimensional Digital Filters", Int.Syst.Sci., Vo1.21, No.8, pp.1727-1732, August 1990.
N.E. Mastorakis, S.G. Tzafestas and N. J. Theodorou, " A Simple Multidimensional Factorization Method", IMACS-lFAC Int. Symp. on Mathematical and Intelligent Models in Syst. Simulation, Brussels, Belgium, September 1990.
C.G. Karagiannopoulos, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis , "Physical Interpretations Concerning Non-Linear Conductivity Phenomena Across No-Load Switching Contacts", pp.611-618, 36 IEEE Holm Conference on Elactrical Contacts, Montreal, August 20-24, 1990.
P.D. Bourkas, C.T. Dervos, "Time Required for Discharge Inception in Combined System of 'Bakalite-Transformer's Insulating Oil' under Impulse Voltage Excitation", pp.87-90, International Symposium Applied, Modelling and Simulation, Lugano, June 18-20, 1990.
C.G. Karagiannopoulos, P.D. Bourkas, C.T. Dervos, "Measurements on contacts of no load switches using different currents and clamping spring force values", pp.94-97, International Symposium Applied, Modelling and Simulation, Lugano, June 18-20, 1990.
N.E. Mastorakis and N.J. Theodorou, "Stochastic Analysis of Multidimensional Systems using the Roesser State-Space Model", IMACS Symposium on Modelling and Control of Technological Systems (MCTS), Vol.2, pp. 166-169, Lille, France, May 7-10, 1991.
G.D. Skikos, A.V. Machias, P.D. Bourkas, "Hourly Average Wind Velocity Stochastic Simulation", paper code 182-018, pp.401-404 International Symposium on Modelling, Identification and Control, Innsburck , February 18-2 1, 1991.
C.G. Karagiannopoulos, C.T. Dervos, P.D. Bourkas, C.A. Kagarakis, "Potential measurements across stationary metal contacts", pp.l22-126 International Symposium Circuits and Systems, Zurich, July 1-3, 1991.
P.D. Bourkas, C.G. Karagiannopoulos, C.T. Dervos, C.A. Kagarakis, "Current Instabilities across oxidized metal contacts operating under charge injection rates", pp. 127-130, International Symposium Circuits and Systems Zurich, July 1-3, 1991.
C.T. Dervos, P.D. Bourkas, K.A. Kagarakis, "Charge transport through a 'metal-thick insulator-metal ' structure during impulse voltage excitation", Journal of Electrostatics , Vol.26, pp. 12 1 - 132, 1991.
C.G. Karagiannopoulos, C.T. Dervos, P.D. Bourkas, Measurments of the potential difference across no-load switching contacts", pp.153-157, International Symposium on Modelling, Identification and Control, Innsburck, February 18-2 1, 1991.
P.D. Bourkas, C.T. Dervos, "Partial discharge inception voltage and breakdown phenomena in organic dielectrics immersed in insulating oil, paper-code 182-020, pp.196-199, International Symposium on Modelling, Identification and Control , February 18-2 1 , Innsburck, February 18-2 1 , 1991.
P.D. Bourkas, "Surface and volume partial discharges under impulse voltage ", paper-code 182-02 1 , pp . 200-203 , International Symposium on Modelling, Identification and Control, Innsburck, February 18-2 1, 1991.
C.G. Karagiannopoulos, C.T. Dervos, P.D. Bourkas, "Non-linear phenomena on copper electrical contacts, paper code 182-106, pp.385-388, International Symposium on Modelling, Identification and Control, Innsburck, February 18-2 I, 1991. K.G. Karagiannopoulos, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "Physical Interpretations Concerning Non-Linear Conductivity Phenomena Across No-Load Switching Contacts", IEEE Trans. on Components Hybrids and Manufacturing Technology, Vol. 14, No.1, March 1991.
J.A. Avgerinos, P.D. Bourkas, A.V. Machias, An Overvoltage and Undervoltage Electronic System for Protection of Industrial Power Distribution Networks", pp.1367-1370, CH2964-5/91/0000-1367s01.00, c 1991 IEEE, melecon 91, Lubliana, May 22-24, 1991.
C.G. Karagiannopoulos, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "An Equivalent Circuit for the Electronic Conduct of Breaker Switches, pp. 1429- 1432, CH2964-5/91/0000-1420s01.00, c 1991 IEEE, melecon 91, Lubliana, May 22-24, 1991.
P.D. Bourkas, C.G. Karagiannopoulos, C.T. Dervos, C.A. Kagarakis, "An Experimental Investigation of the Metal Contacts Resistance at Initial Stages of Operation", pp.1485-1488, CH2964-5/91/0000-1485s0I.00, c 1991 IEEE, melecon '91, Lubliana, May 22-24, 1991.
N.E. Mastorakis, S.G. Tzafestas and N.J. Theodorou, "A Simple Multidimensional Polynomial Factorization Method", IMACS Annals on Computing and Applied Mathematics, Vol. 10, Mathematical and Intelligent Models in System Simulation, Editors: R. Hanus, P. Kool and S. Tzafestas, J.C . Baltzer Scientifiic Co., pp . 73-76, 1991.
S.H. Mentzelopoulou and N.J. Theodorou, "n-Dimensional Minimal State- Space Realisation", IEEE Trans. Circuits Syst., Vo1.CA5-38, No.3, pp.340- 343, March 1991.
A. Kanellakis, S. Tzafestas and N. Theodorou, "Stability Tests for 2-D Systems Using the Schwarz Form and the Inners Determinants", IEEE Trans. Circuits Syst., Vol.CAS-38, No.9, pp.1071-1077, September 1991.
N.E. Mastorakis and N.J. Theodorou, "State Space Model Factorization in m-Dimensions. Applications in Stability Theory" , Foundations of Computing and Decision Sciences, Vo1.l7, No.l, pp.55-61, 1992.
N.E. Mastorakis and N.J. Theodorou, "Approximate Factorization of Multidimensional Polynomials Depending on a parameter ", Bulletin of the Polish Academy of Sciences, Technical Sciences, Vo1.40, No.l, pp.47-51, 1992.
A.J. Kanellakis, S.G. Tzafestas and N.J. Theodorou, "Computing of the Stability Margin of two-dimensional Discrete Systems", IEEE Trans. Circuits Syst., Vol.CAS-37, No.6, pp.824-827, June 1992.
P.D. Bourkas, A.V. Machias, I.A. Stathopoulos, F.V. Topalis, "No Load Medium Voltage Switches Design for Industrial Applications", Energy Systems, Vol. 12, No. 1 , pp.45-49, 1992.
A.X. Moronis, P.D. Bourkas, C.T Dervos, C.A. Kagarakis, "Electronic phenomena at the interface of an insulator-insulating oil combination, during high voltage applications", 6th International Conference on Intergranular and Interphase Boundaries in Materials (iib '92), Vol. 126-128, pp.757-760, Thessaloniki, lune 21-26, 1992.
A.X. Moronis, P.G. Halaris, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "Partial discharges at a solid polymeric insulator-insulating oil interface during the application of high DC voltages, 6th International Conference on Intergranular and Interphase Boundaries in Materials (iib '92), Vol. 126-128, pp.761-764, Thessaloniki, June 21-26, 1992.
C.G. Karagiannopoulos, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "Non linear conductivity phenomena on stationary metal contacts", 6th International Conference on Intergranular and Interphase Boundaries in Materials (iib '92), Vo1.126-128, pp.789-782, Thessaloniki, June 21-26, I992.
N.E. Mastorakis, N.J. Theodorou and S.G. Tzafestas, "Multidimensional Transfer Function Factorization using the State-Space Approach", Parallel and Distributed Computing in Engineering Systems, S. Tzafestas, P. Borne and L. Grandinetti (Editors, Elsevier Science Publishers B.V. (North Holland), IMACS, pp.497-499, 1992.
A.X. Moronis, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, An experimental estimation of the total electric charge at a phenolic resin- insulating oil interface, during stressing with high voltage pulses", pp.268 6th International Conference on Intergranular and Interphase Boundaries in Materials (iib'92), Thessaloniki, June 22-26, 1992.
A.X. Moronis, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis Mobilit of the free electrons at the interface of an organic insulator-insulating oil combination, during high voltage pulse applications", pp.269, 6th International Conference on Intergranular and Interphase Boundaries in Materials (iib'92), Thessaloniki, June 22-26, 1992.
P.G. Halaris, A.X. Moronis, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "Energy of the free electronic carriers at a solid polymeric " insulator- insulating oil interface, under the application of high 1CC voltage , pp.270, 6th International Conference on Intergranular and Interphase Boundaries in Materials (b'92), Thessaloniki, June 22-26, 1992.
A.X. Moronis, P.D. Bourkas, C.T. Dervos, C.A. Kagarakis, "Electron avalanche mechanism in the press board-insulating oil-combinatipn in the power applications", NTUA-lEEE/PAS, Athens, 1993.
S.G. Tafestas, A.J. Kanellakis and N.J. Theodorou, "Two-Dimensional Digital Filters without Overflow Oscillations and Instability Due to Finite Word L,ength", IEEE Trans. Signal Processing, Vo1.40 (accepted).
N.E. Mastorakis, N.J. Theodorou and S.G. Tzafestas, "Factorization of m- D Polynomials in Linear m-D Factors", Int.J. Syst. Sci., Vol.23 (accepted).
S. Tzafestas, A. Kanellakis and N. Theodorou, "Application of the Frequency Dependent Lyapunov Equation to 2-Dimensional Problems", IEE Proc., Pt.D (accepted).
P.D. Bourkas, I. Tsitsoglou, K.G. Karagiannopoulos, G. Pharmaki , P.Constantinou, "Experimental investigation of the electrostatic charging phenomenon under the intluence of external fields", Electrostatic Discharge Journal (EOS/ ESD) pp. 1-9. (accepted).
C.T. Dervos, K.J. Karagiannopoulos, P.D. Bourkas, K.A. Kagarakis , "Measurements of stationary metal contacts under high charge injection rats", IEE Pt. C, in press.