OAK jurnallaridan yig‘ilgan 129907 ta ilmiy maqola: sarlavha, mualliflar, annotatsiya, kalit so‘zlar, DOI va tayyor iqtibos formatlari.
Based on this article the parameters of the experimental device have been presented for obtaining alternative fuel from biomass by the heliopyrolysis method. In addition, in this article, the principle scheme of the…
A mathematical model of heat exchange during cooling of a soil massif using a natural accumulator of cold soil (GANC) has been developed, the results of modeling an underground storage facility for storing fruits and…
The article presents information about the course of the process of concentrating the energy of solar radiation, depending on the properties of the primary source of radiation - the Sun, and the properties of the solar…
The paper considers the efficient use of solar energy for heat supply of agricultural buildings and proposes an analytical method for calculating the air temperature at the outlet of a water heat accumulator in solar…
This article presents the results of an experimental study of heat transfer processes in the laminar flow of hot water moving through pipes of a warm floor with energy saving using solar energy in a water floor heating…
This article presents the relevance of desalination of salt water using solar energy, analysis of the design of existing solar desalination plants, methods for improving the efficiency of solar desalination plants and…
This article proposes the installation of baffle-turbulator type intensifiers in flat solar air collectors. Theoretically investigated the temperature regime in the solar air collector when installing 2, 3, 4 and 8…
A large negative magnetoresistance phenomenon has been observed at room temperature by forming magnetic nanoclusters of manganese doped atoms in silicon by low-temperature diffusion. It has been shown that the negative…
The article presents data that during the operation of synchronous motors at metallurgical enterprises, they give reactive power to the electrical network when switching to overexcitation mode, which, as a result…
In the technological processes of the production of the agro-industrial complex, mechanisms with the translational movement of the working bodies are used. For such mechanisms, electric drives with linear asynchronous…
This paper discusses the issues of individual reactive power compensation in VFD and soft start devices, as well as the effective use of VFD devices used in the control of asynchronous electric motors.
In this article the mathematic model of the problem of optimization of daily mode of electric power system which have thermal (TPP), hydro (HPP), solar (SPP) and wind (WPP) power plants is presented. The optimality…
The article presents the results of the studyresults of research the effectiveness of applying a genetic algorithm of optimization in solving the problems of planning the short-term modes of modern electric power…
This article highlights the wide use of asynchronous electric drives, the control structure of a frequency-controlled asynchronous electric drive, the results of a laboratory stand for the study of an asynchronous…
The article discusses the impact of electricity quality on energy waste. In particular, the components of losses and their causes were studied. In non-sinusoidal and asymmetric modes, the occurrence of additional losses…
The article gives materials in place of existing contact devices of electrical receivers to connect to the network and you can use non-contact devices, given materials in comparison with the difference between them and…
This article is based on the use of time-varying energy tariffs to increase the efficiency of consumed electricity and reduce energy consumption costs. Analysis of the tariff system in the electric power system of the…
The possibilities for constructing pole-changing windings with a ratio of poles 3:4 and improved electromagnetic properties have been investigated in this paper. The results of experimental research work on two-speed…
In this work, equilibrium geometry, bond energy, harmonic and anharmonic spectral parameters of the monomers of CH3CHO, HF molecules and CH3CHO···HF, CH3COH···FH complexes were calculated using the set of bases…
Concentration and temperature studies of spontaneous Mandelstam-Brillouin scattering of light in aqueous solutions of γ-picoline showed the manifestation of negative dispersion of hypersound velocity at concentrations С…
In this work, study of photovoltaic parameters of a perovskite (CsPbI3) film prepared by adding hydroiodic acid (HI acid) to perovskite solution, as well as changes in the properties of integrated structures of…
The anisotropy of the attenuation of acoustic waves by the Akhiezer mechanism in cubic crystals of lithium fluoride is studied. The components of the Grüneisen tensor are determined, with the help of which the…
Исследованы нелинейно-оптические характеристики Cr4+:YAG кристалла методикой Zсканирования по схеме с открытой апертурой. В качестве пробного источника использовано излучение непрерывного лазера на длине волны 1030 нм…
The surface morphology and optical properties of zinc oxide microstructures have been studied by scanning electron microscopy, photoluminescence and Raman spectroscopy. Microcrystals with transverse dimensions of 2–8 µm…
The composition and emission properties of W coated with a monolayer of Ba and implanted with Ba+ ions and alkali metal ions Na+, K+, Cs+ with an energy of 0.5−8 keV at a saturation dose of D=Dsat=(6–8)×1016 sm–2 were…
Model experiments on the scattering of hydrogen atoms by the carbon nanotube surface have been carried out using molecular dynamics methods (ReaxFF, LAMMPS). A single-layer carbon nanotube with chirality (5.5), 0.693 nm…
In the paper, the direct obtaining tungsten nanoparticles from a tungsten ingot by the electron beam evaporation method are discussed. The synthesis of nanoparticles was carried out in a high-vacuum equipment for…
The energies of the Landau and cyclotron transition levels are calculated for various models using the example of an InAs/AlSb quantum well in a magnetic field perpendicular to it. Calculations are carried out at…
Электронная структура приповерхностных областей наночастиц оксидного материала особого типа и возможность на этой основе получения специфических выпрямляющих свойств контактаизучаются теоретически, а затем проверяются…
The nonlinear Schrodinger equation with periodically varying nonlinearity coefficient thatdescribes matter-wave soliton in in Bose-Einstein Condensation (BEC) and optical solitons isconsidered analytically. Variational…
The Praesepe open star cluster is studied in detail based on high-precision observational data. Processing and analysis of all astrometric, kinematic and photometric data are made in a wide area covering the Praesepe…
The paper presents the results of photometric processing of digital images of a new double gravitationally lensed quasar SDSS J2124+1632 observed at Maidanak observatory. The light curves showed that the brightness of…
Shavkat Akhadovich Vakhidov (1932–2008) - Academician of the Academy of Sciences of the Republic of Uzbekistan, International Academy of Engineering, Academician of Cosmonautics of the Russian Federation, Doctor of…
The sequential generation of the 3-rd harmonic in quadratic nonlinear optical crystals with an inhomogeneous domain structure has been studied by a numerical method. The case is considered when the thicknesses of the…
The expediency of use of returning technologies in the processes of gas-phase production of silicon epitaxial structures for solar cells, which previously proved themselves well in the chloride production of raw…
A new installation for growing carbon nanotubes (CNT) by the chemical vapor deposition (CVD) method has been developed, which made it possible to obtain CNTs with a diameter of 2±0.5 nm at a temperature of 500°C using a…
The complex formation of Nile blue acetate (NSA) and oxazine 1 dyes with sodium dodecyl sulfate (SDS) and Triton X-100 (TX-100) has been studied by the steady state and picosecond resolved fluorescence spectroscopic…
The low efficiency of UV-laser ablation of transparent alkali-silicate glass has been increased by means of irradiation by 60Co γ-quanta to doses 104 −107 Gy to induce intensive UV-visible coloration. Varying the…
The ZnS crystal was irradiated by electron beam with an energy of 2 MeV and fluences from 0.5×1017 electron/cm2 to 1.5×1017 electron/cm2 . The initial structure of ZnS is in line with the cubic phase (sp.gr. F-43m)…
It is determined that the spectral dependence of the photocurrent covers a wide range of incident photon energies from 1.07 eV to 3 eV. It is shown that with an increase in the temperature of the onset of…
Sb2Se3 crystalline films were obtained by chemical molecular beam deposition (CMBD) from separate sources of the Sb2Se3 binary compound and the Se element, at a substrate temperature of 500°С. The main strong peaks…
The behavior of intermolecular interactions in fresh and aged solutions of fullerene C60 in neat N-methyl-2-pyrrolidone (NMP), as well as in NMP/xylene mixed solvents, were studied by the methods of ultraviolet-visible…
The spectral dependences of the angles of rotation of the major axis of the polarization ellipse in the Faraday effect in TbAlO3 were investigated at temperatures of 90 K and 300 K in the visible and ultraviolet…
In search of high accuracy and convenient implementation, computational optics uses several modeling techniques such as Maxwell’s equations-based methods, ray-tracing method, Fourier optics methods and many others. Each…
In this study, the optimal regime for the formation of CoSi2 pellets by high-temperature pressing is determined. A CoSi2/SiO2/Si(111) film was created by deposition of CoSi2 onto a SiO2/Si(111) substrate sputtered under…
In this work, we consider the experimental results of studies of the defects formation on the surface of LiF crystals under irradiation with ions using the methods of total current spectroscopy, SIMS, and the SRIM…
In the La0.95Al0.05F3 crystal, the energies of defect formation Ea and potential barriers Em near impurity aluminum ions are determined by quantum-chemical methods. It is shown decrease of these parameters in the…
The effect of irradiation by γ-quanta on the mechanism of current transfer in Al-p-CdTe-Mo structures with an extended base (w = 120 μm) is considered. It is shown that the direct branch of the сurrent-voltage…
The electrical conductivity of complex oxides K1-xNaxSbWO6 (0≤x≤0.6) and K1-xLixSbWO6 (0≤ x≤0.4), which have a pyrochlore-type structure, was studied. The temperature dependence of the ion permeability of the compounds…
The anisotropy of the acoustical-optical properties of lead molybdate crystals is determined by the Dixon method in the mode of Bragg diffraction of light by sound with a change in the direction of the wave vector of…