Alexander B. Samokhin

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Spectrum of the volume integral operator of the three-dimensional electromagnetic scattering is analyzed. The operator has both continuous essential spectrum, which dominates at lower frequencies, and discrete eigenvalues, which spread out at higher ones. The explicit expression of the operator’s symbol provides exact outline of the essential spectrum for(More)
Dimerization of two genomic RNA copies is essential for the assembly of retrovirus particles. This process has been studied in detail, and a two-step mechanism has been proposed for the human immunodeficiency virus type 1 (HIV-1). A similar model can be assumed for avian sarcoma and leukosis viruses (ASLV), despite the lack of homology between the(More)
We present a simple and unified classification of macroscopic electromagnetic resonances in finite arbitrarily inhomogeneous isotropic dielectric 3D structures situated in free space. By observing the complex-plane dynamics of the spatial spectrum of the volume integral operator as a function of angular frequency and constitutive parameters, we identify and(More)
An approximate analytical expression is derived for the two-dimensional incoherent optical transfer function (OTF) of an imaging system invariant to second-order aberrations. The system broadband behavior resulting from a third-order phase mask in its pupil plane is analyzed by using the two-dimensional stationary phase method. This approach does not(More)
The slipped loop structure, earlier identified as an unusual DNA structure, was found to be a possible element of the RNA folding. In order to experimentally test this suggestion, model oligoribonucleotides capable of forming the SLS were synthesized. Treatment of the oligoribonucleotides with nuclease S1 and RNases specific for single- and double-stranded(More)
The new approximate numerical solutions of some inverse problems of electrodynamics allow to increase angular resolution of radar-tracking systems based on antenna arrays. The method of imaging point targets in the multiple targets with the help of UWB signals is developed which is not complicated for practical realization in real-time operation mode. A(More)
A new method of digital signals processing is presented. It allows to obtain angular superresolution. The new signal processing technique is based on parametrization taking into account a priori information about the solution. A comparison of the known efficiency with the developed method is carried out. The results of numerical experiments using a(More)