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Information × Registration Number 0200U001680, 0197U000669 , R & D reports Title Problems of diffraction and oscillation theory in the irregular systems popup.stage_title Head Petrusenko I.V., Registration Date 15-03-2000 Organization Dniepropetrovsk State University popup.description2 Methods of solving the problems of electromagnetic waves diffraction by areas of complex form are considered. Methods of representation of such areas as a compositions of areas of the simple forms are investigated. The theorems of the use of direct methods of mathematical physics for a number of decomposition methods have been proved. Conditions of instability of parametrical oscillations with unharminic pumping are investigated. Multifrequent pumping and Kronig-Penny model have been considered. Classification of instabilities is submitted. Dependence of stability conditions on phase parities between modes of pumping is found and analysed. Product Description popup.authors popup.nrat_date 2020-04-03 Close