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- Neil V. Budko, Alexander B. Samokhin
- SIAM J. Scientific Computing
- 2006

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)

- Artemy D. Beniaminov, Alexander B. Samokhin, Nikolai B. Ulyanov, Elvira E Minyat
- Molecular Biology
- 2005

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)

- Neil V. Budko, Alexander B. Samokhin
- Physical review letters
- 2006

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)

- Alexander B. Samokhin, Aleksey N Simonov, Michiel C Rombach
- Journal of the Optical Society of America. A…
- 2009

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)

Abstract. We show that the mode corresponding to the point of essential spectrum of the electromagnetic scattering operator is a vector-valued distribution representing the square root of the three-dimensional Dirac’s delta function. An explicit expression for this singular mode in terms of the Weyl sequence is provided and analyzed. An essential resonance… (More)

- B. A. Lagovsky, Alexander B. Samokhin, Yury Shestopalov
- 2016 URSI International Symposium on…
- 2016

Resolution of goniometric systems on the basis of antenna arrays can be increased due to the secondary digital processing of the accepted signals. Necessary algorithms are created on the basis of solution to inverse problems.

- Artemy D. Beniaminov, Nikolai B. Ulyanov, Alexander B. Samokhin, V. I. Ivanov, Zhizhao Du, Elvira E Minyat
- Molecular Biology
- 2003

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)

- Alexander B. Samokhin, A. S. Samokhina
- 2016 URSI International Symposium on…
- 2016

We consider volume singular integral equations (VSIEs) which describe electromagnetic scattering on 3D inhomogeneous dielectric structures. By using the theory of multidimensional integral equations we reduce VSIEs to the Fredholm integral equations of the second kind.

- B. A. Lagovsky, Alexander B. Samokhin, A. S. Samokhina
- 2015 International Conference on Electromagnetics…
- 2015

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)

- B. A. Lagovsky, Alexander B. Samokhin
- 2017 International Conference on Electromagnetics…
- 2017

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)