Design and numerical analyses of the human greater circulatory system

The paper presents examinations of human's greater part of the circulatory system, modeled as an electric net. The similarities between human's greater circulation and the electric model have been evolved. The analysis of the greater circulation was performed in PSPICE – an environment of electric circuits modeling. The designed model allows to analyze human's greater circulation in physiological and pathological cases.     

On Competitive Extinction in Impulsive Lotka–Volterra Systems

We study a Lotka–Volterra system with periodic coefficients and impulse action at fixed moments of time. We find conditions for competitive extinction and conditions for the existence and uniqueness of a discontinuous periodic solution lying on one of the coordinate axes or coordinate planes in the phase space of the system.     

Photolysis of compounds with P−I and As−I bonds

Detailed experimental investigations are reported of the parameters of lasing on the transition²P_1/2→²P_3/2, λ = 1.3 μm of atomic iodine upon photodissociation of the molecules (CF₃)₂AsI and (CF₃)₂PI. The light source was an IFP-5000 flash lamp. The experimental data are used to determine the sequence of the basic reactions that accompany the photolysis of the molecules (CF₃)₂AsI and (CF₃)₂PI and to determine the energy parameters of the generated radiation.     

铜/纳米金刚石复合物的结构及其对高氯酸铵热分解的催化作用

Nano-Copper and Cu/UDD (ultradispersed diamond) nanocomposites were separately prepared by reduction of CuCl₂ aqueous solution and that doped with 0.7%(weight percent) of ultra-dispersed diamond. The as prepared nano-crystals were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance techniques (EPR). It was found that homogeneous nucleation dominated the aqueous reduction reaction at high concentration and the diameter of nano-copper decreased as the reaction time shortened, yet at lower concentration heterogeneous nucleation predominated and the doped UDD functioned as heterogeneous nucleation. Otherwise large number of free-radicals existed in the nano-composites. Both of nano-copper and Cu/UDD nanocomposites were strong catalysts for AP decomposition, with Cu/UDD being a more effective one. The higher decomposition temperature for AP was 119 ℃ lower than that without catalyst. And the exothermic quantity of decomposition was from 590 J·g^-1 to 1 400 J·g^-1 by mix 2% of the Cu/UDD nanocomposites.     

Structural and morphological transformations of diamond-like coatings subjected to energy treatment

The impact of microwave radiation and heat treatment on the structure, morphology, and physical and mechanical properties of diamond-like coatings is studied; recrystallization of the coating structure is revealed. It is ascertained that microwave irradiation of diamond-like coatings changes their physical and mechanical properties.     

X-ray microscopy of track membranes and biological objects in the soft-and hard-wavelength ranges

The methods used to obtain X-ray images of track membranes and various biological objects in the soft (20 nm) and hard (0.2–0.02 nm) wavelength ranges have been considered. In the range of soft X-rays, the images were obtained in a Schwarzshild microscope. In the spectral range of hard X-ray radiation, various methods were used including the use of Fresnel zone plates, asymmetric reflecting crystals, X-ray microradiography and microtomography.     

Hybrid photonics structures with grating and prism couplers based on ZnO waveguides

This paper presents the results of investigations concerning input-output systems of an electromagnetic wave in the visible and near visible spectrum for their application in structures of integrated optics. The input-output structures used in described planar optical waveguides are in a form of prism and grating couplers. The first part of the paper contains numerical analysis of grating couplers aiming at an optimization of their geometrical parameters, strictly — the depth of the grooves in the grating coupler. The second part presents the practical realization, as well as experimental tests of the planar optical waveguide with the hybrid input-output system. As the input system of the electromagnetic wave, a prism coupler was used, and in the case of the output system — a photonic structure with grating coupler was applied. The investigated planar wave guides with the input-output structures were made of a wide energy band gap semiconductor — zinc oxide (ZnO).     

Scope and limitations of the synthesis of functionalized quinolizidinones and related compounds by a simple precursor approach via addition of lithium allylmagnesates to 2-pyridones and RCM as key steps

The scope and limitations of the simple synthesis of functionalized quinolizidin-4-ones by chemoselective N-alkenylation of NH pyridin-2(1H)-ones (2-pyridones), regioselective addition of lithium allyl(di-n-butyl)magnesates(1-) to N-alkenylpyridin-2(1H)-ones, followed by ring closing metathesis (RCM) is described. A number of functionalizations introduced into quinolizidin-4-one rings demonstrated the high prospect of the strategy proposed in scaffold synthesis. Their extension to the syntheses of pyrido[1,2-a]azepin-4-one and pyrido[1,2-a]azocin-4-one derivatives as well as to spiro-fused compounds is also presented.     

Photodissociation of the molecules SiCl3I and SiF3I

The parameters of lasing based on the transition of atomic iodine and occurring upon photodissociation of the molecules SiCl₃I and SiF₃I are experimentally investigated. The light source employed was a coaxial xenon-filled flash lamp of original construction. The main chemical reactions that accompany the photolysis of the molecules SiCl₃l and SiF₃I and determine the energy characteristics of the f~enerated radiation are analyzed.