| Nashriyot | Ўзбекистон Республикаси Фанлар академияси |
|---|---|
| Shahar | Toshkent |
| ISSN | 1025-8817 |
| e-ISSN | 2181-077X |
| Tashkil etilgan | 1957 |
| Nashr davriyligi | annual international symposium on ph |
| Maqolalar soni | 430 |
| OAK holati | Ro‘yxatda |
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…
The relative bond strengths of various electronic configurations of rare earth elements are investigated. A general tendency of strengthening of the 4f-electron bond in comparison with the 5d-electron bond has been…
In this work, the intermolecular interactions of diacetyl and water molecules were studied using the vibration spectrum. The Raman scattering spectra obtained in the range of 500– 2000 cm−1 were analyzed and compared…
The optimal geometric parameters and potential energies of the gauche- and trans-conformers of the ethanol molecule have been calculated by quantum chemical modeling method. Using the optimal structures of conformers…
In this work, a liquid aniline was studied in a pure and aqueous solution using experimental and theoretical calculations. Using Raman spectra, the region of 100–3200 cm−1 was analyzed, and blue shift and red shift were…
Using the Kubo-Greenwood formula in the approximation of Davis-Mott, the region of exponential absorption of amorphous semiconductors has been theoretically investigated. Analytical expressions for partial absorption…
The energy characteristics of the octupole states of the 238U nucleus are studied within the framework of a phenomenological model that takes into account the Coriolis mixing of the states of rotational bands. The…
This paper performs to research in detail the Epson Expression 10000XL scanner for photographic astroplate archive of the Ulugh Beg Astronomical Institute (UBAI) of the Uzbekistan Academy of Sciences. For processing the…
Recently, much attention has been paid to solar cells based on inorganic perovskite materials. However, the quality and thickness of perovskite films are still unsatisfactory due to the limited solubility of the…
In the study, the correlation of optical and photocatalytic properties of ZnO nanorods and ZnO/Ag nanocomposite materials were investigated. ZnO nanorods were synthesized at low temperatures by the hydrothermal method…
The equations for linear and nonlinear optic secceptibilities of spherical quantum dots for isolated media in which electrons connected with Gelman reverse quadratical potential have been obtained. For their solving we…
Recently, the use of cold atmospheric plasmas for cancer therapy has become one of the most exciting topics of plasma application. Despite promising results from a large number of studies, the underlying mechanisms by…
It is shown that the main contribution in the two-photon linear-circular dichroism in narrowgap semiconductors is made by optical transitions proceeding from the subband of light holes to the conduction band. The…
We consider, by analytical and numerical means, the dynamics of a matter-wave soliton bouncing on the reflecting surface (atomic mirror) under the influence of gravity, when twobody interactions between atoms are…