Using the finite difference time domain (FDTD) method, we studied the optical properties of black silicon (BSi) layers passivated with the various metal oxides (Al2O3, TiO2, HfO2, and Sc2O3) films, obtained by atomic layer deposition (ALD) method. The results of FDTD modeling indicate an improvement in the antireflection properties of BSi/ALD film structures in the wide spectral range. The necessity

The melting of poly(rA)-poly(rU) and its complexes with the intercalators — methylene blue (MB) and ethidium bromide (EtBr) has been carried out at the ionic strength of the solution 0.02, 0.04, and 0.1 M. It was revealed that this polynucleotide has the non-stable double-stranded structure at the ionic strength of 0.02 M and it becomes more stable at the complex-formation with the mentioned ligands

Using the method of electron beam evaporation, the conductive films of gallium doped (1.6 at%) zinc oxide (GZO) were obtained. As the upper and lower electrodes, silver and glass substrates coated with tin oxide doped with fluorine (FTO) were used, respectively. The films were annealed in air at 350°C for 1 hour. The current-voltage characteristics of the Ag/GZO/FTO structure reveal a linear behavior

In spite of a large amount of the existing experimental data in the region of low-energy proton- and photon-nuclear interactions, new experimental measurements are still needed to gain insight into a number of problems in nuclear physics. Particularly, the stellar nucleo-synthesis, the study of the resonance states of light nuclei, the underlying mechanisms of the (p,n), (p,α) and (γ,p), (γ,n) reactions

The results of the theoretical simulation of an electrolyte-insulator-semiconductor (EIS) biosensor made on a silicon nanowire for the detection of low concentration DNA molecules are presented. The equivalent electrical scheme for the EIS structure is constructed. The phenomenon of charge distribution in a depletion layer of semiconductor is taken into account in computations. The behavior and dependence

X-ray dynamical diffraction Talbot effect in perfect crystals is studied. The effect is analyzed for the case of incident final front wave. Some peculiarities of effect are revealed, expressions for the Talbot effect and exact Talbot effect are found. The results are compared with the ones obtained earlier in a diffracted beam in case of incident infinite front wave.

The possibility of application of a new class of the SFCO sensors (the radiofrequency ‘magnetic-field’ probes) for the non-contact far-field non-destructive scanning of various structures and media is discussed. The prospectivity of their use is shown both for the detection of structural defects of the scanned objects and ‘in-vivo’ investigation of organism tissues and medium.

The process of the DNA sequencing in solid-state nanopores is considered. The theoretical modeling of ionic, thermionic, and tunnel currents for nanopores with the gold electrodes located in bio-liquids has been carried out. It is shown that both the ionic and thermionic currents are several orders of magnitude weaker than the direct tunneling current, which reaches several hundred of nA. The differences

In this paper we present an experimental study of the electron transport in composite samples based on an insulating matrix of polybenzimidazole with graphite nanoparticles as conducting filler. Based on a qualitative analysis of the temperature dependences of electrical resistance obtained for the samples with different filler concentrations, it was established that the electron transport occurred

The hydrothermal microwave method for the synthesis of diopside is developed. The changes in the physicochemical properties under the influence of radiation, which simulate the space conditions and the UV radiation of the Sun on the optical properties of the diopside are investigated. The microwave method enables to manufacture the crystalline CaO·MgO·2SiO2-diopside at lower temperatures (850°C) as

The resistance of a monolayer of complexes of the double-stranded DNA with quantum dots were computed. It was shown that with the non-competitive DNA hybridization and in the presence of monovalent positively charged ligands in the solution, a decrease in resistance occurs as compared to that for uncharged ligands. It is shown that the charged ligands enhance the sensitivity of the DNA chips as compared

A study was made of the physical processes taking place during the generation of a shock wave at the outlet of a nozzle of a gas-generator station, when emitted into the atmosphere at a supersonic velocity of the gas mixture formed in the chamber during the combustion of gas. The investigation of the spectral characteristics of an exciting shock sound wave was made as well as the corresponding computations

The problem of the polarized light propagation in an optically homogeneous anisotropic medium with spatially modulated gyrotropy is considered. The analysis was carried out using a numerical solution of a system of coupled equations obtained in the approximation of geometric optics. For illustrative purposes, the results of numerical analysis are also presented on the Poincare sphere. The resonance

The production of alpha particles in photonuclear reactions on 65Cu, 115In, 92Mo and 207Pb targets in the beam of accelerated electrons with energy of 21 and 40 MeV was studied. The experiments were run on the Linear Electron Accelerator NLA (The Yerevan Physics Institute). The measurement results represent the yields of reactions studied as functions of the mass number of nuclei and the photon energy

The limiting potential model is considered for a spherical quantum dot with three variation parameters–the well depth, external and internal radii. The stationary s-states are computed by way of the exact solution and in the WKB approximation. If the quasiclassical conditions are met, the approximate consideration is applied for the states with l ≠ 0. As a result, the energy values of the lower bound

The continuum elasticity model is applied to investigate quantitatively the growth features and nucleation mechanism of quantum dots, nanopits, and joint QD-nanopits structures in CdZnHgTe quasyternary material system. We have shown that for the CdZnHgTe solid solution deposited on the CdTe substrate, the sign of the critical energy and volume of island is changed at the critical strain of ɛ* = 0.006

The quantum tunneling of a singular potential is modeled, as a rule, by the method of regularization. It proceeds from the intermediate usage of a nonsingular-type preimage of the potential function. In this work, it has been ascertained that the preimages continuously differentiable at the point of singularity does not reproduce the singularity in the problem of quantum tunneling.

The influence of an aluminum compensation filter of complicated form on the signal-tonoise ratio in microtomography of geological cores was investigated. When scanning the core, a compensation filter in the form of an aluminum parallelepiped with a hole approximately equal to the diameter of the core was used. The filter is fixed rigid over the object table, the core is placed in the hole and rotates

The influence of an external electric field on refractive indices of ordinary and extraordinary waves is investigated by means of the method of X-ray interferometry. The decrements of E7 type nematic liquid crystal were calculated for different values of external electric field strength and it was established that with increasing electric field strength the values of decrements of ordinary and extraordinary

The physical principles and advantages of the use of a new class of the SFCO sensors (radio-frequency ‘magnetic-field’ probes) for the investigation of biomedical signals are discussed. The perspectivity of their application for the investigation of dynamic changes of dielectric characteristics of tissues and the medium of the organism is demonstrated. Data related to the registration of the state