Dmitry S. Kozlov

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The effects of temperature and precipitation on the formation of annual rings in stem wood of Siberian larch in ecotopes with optimal, insufficient, and excessive soil moistening are discussed. It is shown that precipitation fallen in the period from April to June, when the needles are formed, has a favorable effect on xylem increment. This relationship is(More)
The paper is devoted to the derivation of a bidirectional distribution function for crystals, which specifies all outgoing rays for a ray coming to the boundary of two transparent crystalline media with different optical properties, i.e., a particular mineral, directions of optical axes if they exist, and other features. A local model of interaction based(More)
Passive intermodulation (PIM) often limits the performance of communication systems with analog and digitally modulated signals and especially of systems supporting multiple carriers. Since the origins of the apparently multiple physical sources of nonlinearity causing PIM are not fully understood, the behavioral models are frequently used to describe the(More)
An approach to verification and validation of algorithms that render transparent objects (media) is described. Rendering of transparent optically isotropic objects has been studied extensively. However, the papers devoted to optically anisotropic objects are few in number. The main goal of the present paper is to suggest a collaboration in creating and(More)
This paper presents initial results of evaluating suitability of the conventional two-tone CW passive intermodulation (PIM) test for characterization of modulated signal distortion by passive nonlinearities in base station antennas and RF front-end. A comprehensive analysis of analog and digitally modulated waveforms in the transmission lines with weak(More)
We analyzed the problem of mathematical modeling and computer simulation of nonlinear controlled dynamical systems usually described by differential-algebraic equations. The problem is proposed to be solved in the framework of the semi-empirical approach combining theoretical knowledge for the plant with training tools of artificial neural network field.(More)
This paper is concerned with characterisation of passive intermodulation (PIM) in distributed RF circuits and components with the aid of emerging nonlinear RF techniques. Conventionally, intermodulation (IM) is defined as a phenomenon which is characterised by the appearance of additional spectral components in the output spectrum of a nonlinear system(More)
This paper presents an RF CAD assisted approach to accurate characterisation of microstrip nonlinearities in planar microwave circuits fabricated on commercial printed circuit board laminates. The proposed methodology is employed for the analysis of the nonlinear effects in microstrip filters due to weak intrinsic distributed nonlinearity. The results of(More)
This paper is devoted to the problem of photorealistic rendering of optically active crystals. Optical activity (rotation) is turning of the polarization plane of linearly polarized light while it propagates through optically active medium. Quartz is one of well-known optically active crystals. It is an optically uniaxial crystal; however, there are(More)
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