| 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 |
With deep sorrow we announce the death of Academician Bekhzod Sadykovich Yuldashev, an outstanding physicist, talented organizer of science, public and political figure, President of the Academy of Sciences of the…
Using optical spectroscopy method the dependence of the electronic structure and spectral properties of asymmetric cyanine dyes − the bases of styryls and methoxystyryls − on their chemical structure, primarily the type…
The formation mechanism of methylglyoxal monomers, dimers, trimers, methylglyoxal+benzene, and methylglyoxal+ethanol complexes was investigated using the density functional theory (DFT) approach and the…
line-water solutions was established and their dynamics were studied depending on the temperature of the solution and the concentration of γ-picoline in the solution. Analysis of the research results confirms the…
Despite significant advances in hydrogen storage using carbon-based nanomaterials such as carbon nanotubes (CNTs), attempts to significant increase the hydrogen storage capacity are still lacking. This study examines…
Comparative conditions for the stabilization of hydrosol samples of polydisperse silica SiO2 nanoparticles in the size range up 66 to 375 nm are considered. Nanoparticles were obtained at the Institute of Ion-Plasma and…
The Nd:YAG, Ce:Nd:YAG, and Cr:Nd:YAG active media in multi rod configuration are investigated for solar-pumped lasers using simulation methods. A statistical model employing Monte Carlo photon tracing simulates a laser…
This study dedicated to a novel method for synthesizing silicon-carbon (Si/C) and silicon dioxide-carbon (SiO2/C) nanocomposite anodes for lithium-ion batteries, utilizing industrial copper slags from the Almalyk Mining…
A method for producing a thin semiconductor film of antimony selenide (Sb2Se3) via vacuum thermal evaporation with the assistance of an electric field was presented. The morphological, elemental and structural…
The review explores recent advancements in aluminum-ion battery technology, focusing on innovations in cathode materials, electrolyte chemistry, and performance enhancement. Notable developments include new cathode…
Observations from the James Webb Space Telescope (JWST) in recent years pose serious challenges to standard cosmology. Such a situation prompts to reconsider the models presented as alternatives to the Lambda-Cold Dark…
The discovery of disagreement between the main indices of solar activity − the international sunspot number (or Wolf sunspot number) and the group sunspot number − led to the need to determine the causes and factors…
The issues of instability of individual oscillation modes for a nonlinear nonstationary model of collapsing galaxy clusters have been studied. The instability of the model with respect to two disturbance modes is…
In this work, interactions in biologically active active “butanoid (butyric) acid (BA)-acetonitrile/DMSO/pyridine/water” complexes and their spectral manifestations were studiedusing ab-ibitio calculations. When complex…
The resource of fast-reading scintillator LuAG:Pr single crystals used in detectors for high-energyphysics is limited by fast neutron fluences ≥1016 cm−2 due to the accumulation of defect color centers.The purpose of…
A solar laser with an active medium of Ti:Sa/Nd:YAG composite structure has been studiedfor the first time using Monte Carlo photon tracing technique. The results show that the use ofan Nd:YAG active medium in…
In the paper, we numerically investigated the effects of the spectral shift in LED emission onthe pumping characteristics of LED-pumped lasers. We aim to illustrate how variations in theblue LED emission spectrum can…
Single-crystal films of solid solution Si1-xGex (0<x<1) were grown on Si<111> substrate from atin solution-melt at the temperature in the range of the onset of crystallization Tnc=(800−1050)°С by…
The mass-charge spectra of multiply charged ions in a two-element laser plasma are studied bylaser ionization mass-spectrometry. The package of the mass spectrum of the Eu2O3 ions of thelaser plasma was obtained within…
A theory is developed of the inter band magneto-optical absorption of light in a nanodimensionalquantum well in a strong magnetic field due to interaction electrons with opticalphonons. We study the behavior of the…
The Faraday effect (EF) of single-crystal of dysprosium orthoaluminate (DyAlO3) was investigatedin the wavelength range 440–750 nm in the visible region of the spectrum at temperaturesof 90 K and 300 K. Magnetic…
In the paper the catalogs of galaxy clusters are analyzed that have been published based on observationaldata to date. Based on the results of the study, a consolidated catalog was compiledcontaining 213 of the richest…
The article presents the results of a photometric study of observational data of a four-componentgravitationally-lensed quasar GRAL J024848.7+191331 observed at the Maidanak Observatory.The light curves of the system as…
The optical absorption and photoluminescence of UPS-923A organic scintillators with a polystyrene base and p-Terphenyl (рTP) and 1,4-Bis(5-phenyloxazolyl benzene (POPOP) additives pTP and POPOP additives, the absorption…
In this work, the influence of temperatures (300 and 600K) and pressures (1.5 and 10 bar) on the adsorption process of nitrogen atoms by a double-walled carbon nanotube (DWCNT), (5.5+1010) was studied by the molecular…
We studied transversely solar-pumped Nd3+ doped fiber laser with parabolic trough via simulation models developed by Monte Carlo photon tracing method. Our analysis involved estimating losses at cavity walls and the…
In this work, the results of a comparative study of the effect of drought on chlorophyll fluorescence and morphophysiological parameters of genetically modified cotton varieties grown in field conditions. The dynamics…
High-quality crystalline films of Sb2(SxSe1-x)3 were obtained by vacuum thermal evaporation method from powders of the binary compounds Sb2S3 and Sb2Se3 at a substrate temperature of 300°C. The influence of the atomic…
The anisotropy of the acoustic properties of mixed KRS-6 crystals has been studied. For the first time, all independent components of the complex elasticity tensor are determined. It is shown that the strongest…
Adsorption and surface ionization of molecules of diatomic alkali halide salts and various classes of organic compounds on the surfaces of oxidized tungsten and molybdenum were studied by non-stationary methods of…
In this work, the optical and morphological properties of an artificial opal-ZnO nanocomposite obtained by chemical deposition were investigated. ZnO nanofilm filled in the pores of artificial opals with photonic…
This paper provides an overview of methods for preparing nickel nanocatalysts. Electric discharge processing is considered as the optimal method for synthesis of nanoparticles. Particles with an average size of 49 nm…
In this study, the results of an experimental study by surface ionization mass spectrometry of the insecticide acetamiprid (N1-methyl-N1-[(6-chloro-3-pyridyl)methyl]-N2-cyanacetamidine) in an oxidized tungsten…
Raman and FTIR spectra of pure ethanol and its proton-donor and proton-acceptor solvents were studied using experiments and ab-initio (DFT) calculations. Spectral bands related to C-H and O-H stretching vibrations of…
The results of observations of the crystallization front during the growth of leucosapphire single crystals by the Czochralski, Verneuil and zone melting methods were carried out. The studies were carried out using a…
The formation of colloidal species of fullerene C60 in two component (xylenedimethylformamide) organic solvents was studied for the first time. The results of the study of the refractive index and UV-visible spectra of…
Using the method of computer simulation based on the density functional theory, the influence of vacancy on the structures of silicon clusters Si29H36 and Si29VH36 are calculated. It is shown that the simultaneous…
This article describes the designs and characteristics of new module types equipped with converters that can convert the thermal component of concentrated solar radiation. These converters are based on granular silicon…
В работе исследовались композитные протонно-обменные мембраны на основе поливинилового спирта, содержащие наночастицы диоксида кремния, которые разрабатывались с целью улучшения их механических свойств и химической…
Исследовано затухание высокочастотных акустических волн в кубических кристаллах хлорида натрия. Впервые определены все три независимых компонента комплексного тензора упругости и эффективные константы Грюнайзена в этих…
The rapid development of polymer solar cell (PSC) technologies in recent years has achieved impressive gains in energy conversion efficiency (ECE), reaching values of over 19 percent, demonstrating great promise for…
The motion of a light spinless particle in the vicinity of a heavy central mass is analyzed. We have derived the wave function and energy spectrum ofa particle. It is shown the ground state of a particle in the…
The refractive indices of n aqueous solutions of 4-methylpyridine (4-MP) were measured at a temperature of 27 Celsius. It has been established that with increasing concentration x of 4-MP in solution, the refractive…
The paper presents the results of studying the nature of the electron energy levels in a quantum well of heterostructures AlAs/InxGa1-xAs/AlAs containing a thin InAs nanolayer. The dependences of these energy levels on…
A prototype of a low-level signal amplifier with the ability to provide stable signal amplification for use in electronic thermometer circuits has been proposed and experimentally implemented. The amplifier can operate…
In this study, intermolecular interactions in liquid methyl-ethyl-ketone and its chloroform solution were studied by Raman spectroscopy and density functional theory (DFT) calculations. In aggregates, the energy…
In this work, on the example of butyl acetate, the nature of intermolecular interactions was studied using vibrational spectroscopy (Raman and FTIR) and non-empirical calculations. The geometric structures of the most…
The influence of an argon environment on the structure and vibrational spectra of methanol was studied by quantum-chemical simulation methods. The DFT method in the B3LYP/cc-pVTZ approximation was used to calculate the…
The growth of oxide layers of various dielectrics on the silicon surface is carried out at high temperatures (1150-1200) Celsius in an atmosphere of dry oxygen O2. The color of the coating is determined by its thickness…