| 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 |
The effect of ultrasonic action on the density of electronic states localized at the Si-glass interface is studied. A method is proposed for determining the surface and volume generation rates of charge carriers using…
The complex activation technology for fabrication of the high-strength aseismic concrete was developed with using nature water modified by SiO2 nanoparticles. Concrete strength on 20% increasing is provided due to…
A description of a remote laser lidar for monitoring terrestrial vegetation is given. Spectral curves of laser-induced leaf fluorescence in the vegetation section were measured on the example of cotton. Informative…
The light load current-voltage characteristics of solar photovoltaic module based on polycrystalline silicon have been studied at the temperature range of t=(19−40)°С under conditions of natural solar illumination…
This paper presents the results of calculations of the formation of Tamm states, depending on the amplitude of the perturbations of the boundary conditions. The calculation of additional bound states of electrons formed…
In the interactions of gold nuclei with the energy of 10.6 A GeV with heavy emulsion nuclei, the characteristics of double-charged projectile fragments were studied. The nonisotropy of the direction of motion of…
A phenomenological model of coronal bright points (CBP) as a result of the interaction of current systems in the solar corona (CTS) was proposed. The model is based on observational data related to the CBP, as well as…
The results of investigation of the developed new innovative product − oil pitch, used as the main binder in non-ferrous metallurgy are presented. The studies were carried out by modern physical[1]chemical methods…
The paper is devoted to investigation of magnetization on the surface of HTSC by the magnet optical method. It has been shown that in a week external magnetic field flow easily may enter inside the superconducting…
The effect of ionized impurities and microtubes on the reverse breakdown voltage of the p-n junction based on 4H-SiC obtained by low-temperature diffusion was studied. It is shown that using the equation for breakdown…
The research results of photosensitivity of Au-νGaAs:O-nCdS-nInP-Au heterojunction structure under various electrical circuit configuration are presented. It is experimentally shown that irrespective of the excited…
Under exposure to UV radiation in SiO2 nanoparticles compressed in the form of tablets, a broadband photoluminescence centered at around 460 nm has been observed. The luminescence intensity depends on the duration of…
Theoretical analysis and experimental study of the interaction of light waves in a fiber coupler revealed the optimal conditions for the manufacture of fiber couplers for optical communication systems. The dependence of…
The spin-dependent size quantization of the energy spectrum of current carriers through a two-barrier semiconductor structure is theoretically researched. In this case, the spin-orbital splitting is taken into account…
In the paper, the distribution of the electromagnetic field near the sample is discussed. The results are compared with the results of an earlier developed theoretical model for the field near the dielectric microsphere…
In interactions of gold and sulfur nuclei at 10.6 and 200 GeV/nucleon, respectively, the azimuthal emission angles of particles of different types, both produced and fragments of primary nuclei were measured. Intragroup…
The article presents the results of a study on the production of nanofibre anisotropic nanoporous materials based on silk fibroin and cotton cellulose by electrospinning using a rotating screen-receiver of nanofibers in…
In this work, several liquid electrolytes (LE) have been prepared. The electrolytes contain tetrapropylammonium iodide (TPAI) salt with different salt content, propylene carbonate (PC), ethylene carbonate (EC)…
The excited collective states of heavy even-even nuclei of the quadrupole type are studied in the framework of an arbitrary nonaxiality approximation of the nonadiabatic collective model. The energy spectrum of the…
The bank of observational data on dwarf galaxies has been assembled. Based on the observational data, a special composite catalog of dwarf galaxies up to a distance of 121 Mpc was composed. This catalog contains…
The smelting of industrial silicon is the most energy-intensive and environmentally hazardous process in the production chain of solar cells and electronic products. To solve the problem, new physically justified…
In the paper, the results of quantum-chemical simulation of five possible conformers of a propanol molecule, as well as of their hydrogen-bonded dimers are presented. Optimal geometry and energy parameters of the…
In this work, we investigated the phase change of the radiation wave of a high-power femtosecond laser propagating in the atmosphere due to absorption of radiation by the medium. Numerical experiments conducted for…
The electronic structure of CdМеTe nanostructures was studied by techniques of secondary and photoelectron spectroscopy. Particularly, for the first time it has been shown that in the conductivity band of the CdZnTe…
The results of a set of works on the technology of secondary cast polycrystalline silicon and the creation on this basis of solar cells and other semiconductor devices are presented. The prospects of mastering the…
Concrete strength increasing technology for the solar panel base was developed using modified by 40 nm size SiO2 nanoparticles nature water, exposed complex activation process. Highest values of compressive strength…
Known and original methods of utilization of dust wastes in the form of microsilica formed in the processes of electric arc smelting of technical silicon or ferrosilicium by their use in concrete, building mixtures…
The dependence of photoelastic properties of PbMoO4 crystals, doped with Na and Nd impurities, on the direction of polarization of diffracted light on the acoustic waves have been determined by the Dixon method in the…
We studied the potential of Ce:Nd:YAG crystal in solar pumped lasers. In the study, recently proposed multi-pass pumping configuration and the Fresnel lens, 0.8 m2, have been considered using statistical Monte-Carlo…
The structural features and dimensional characteristics of aggregates of fullerene C60 synthesized in binary mixtures of organic solvents (xylene-tetrahydrofuran), which prepared by a non-equilibrium way (mixing of the…
Investigation of grazing scattering of 3 keV Ar+ and Xe+ ions from the defect surface InP(001) are reported. Computer simulations based on the binary collision approximation permit one to carry out a quantitative…
Adsorption and surface ionization of imipramine and amitriptyline on the surface of oxidized tungsten were studied by methods of voltage modulation using a high-vacuum mass spectrometer installed with a "black camera"…
The results of thermal desorption surface ionization spectroscopy and GC/MS studies of synthetic cannabinoids, indole and indazole derivatives, confiscated in the form of powders and smoking mixtures on various plant…
The processes of low-temperature annealing of deep levels in silicon doped with cobalt atoms are investigated by means of deep level transient spectroscopy. It is shown that in n-Si<Co> during heat treatment at…
The influence of ytterbium atoms on the electrophysical properties of silicon MIS-structures is investigated by means of CC-DLTS and high-frequency volt-farad characteristics. It is shown that the presence of ytterbium…
The yield of M1+ atoms and Mn+ type nanoparticles as a function of current density during the sputtering of the surface of metals by accelerated ions was investigated.
The main aim of this work is to carry out measurements of radon and its daughter product’s activity in newly-built two- and three-storeyed houses in winter and summer seasons, an assessment of annual effective doses…
The paper presents methods of cleaning the surface of substrates before coating with vacuum-plasma methods. The mechanical and chemical cleaning methods are considered: heat treatment and glow discharge treatment. The…
The possibility and prospects of using of granular silicon as a material for the manufacture of thermal energy converters are discussed. It is shown that granular silicon particles mechanically brought into contact with…
In this work the energy distributions of Ar+ ions scattering by the surface InP(001) in low indexing directions at the grazing incidence of bombarding ions are presents. In energy distributions the peaks which…
In the paper, the effect of disordering of the surface layers on the electronic and optical properties of single-crystal silicon has been studied. An analysis of the photoelectron spectra shows that with complete…
SinOm+ cluster ions sputtered from Si surface by Xe+ under O2 flooding have been investigated using double focusing ion microanalyzer with reverse geometry. Proposed structural schemes of the cluster cations have been…
The nonvalent interaction of fullerenes Cn (n = 20, 24, 26, 28, 30, 32, 36, 50, 60) with defect-free graphene has been studied using computer simulation methods. The adsorption energies and equilibrium distances of…
Изучены возможные механизмы локализации носителей в неоднородных дырочно-легированных купратах и металл-диэлектрик переходы (МДП) в них. Показано, что диэлектрическое состояние легированных купратов отличается от…
In the article, new version of photoreceivers of autonomous type is discussed. The electro-optical and magneto-optical properties of photoreceiver of the generator type working with light power are described. The…
The influence of the impurity of erbium, lanthanum and oxygen on the processes of formation of radiation defects in silicon was studied by method of deep level transient spectroscopy. It is established that the presence…
In the present paper the numerical value of the critical temperature of fullerene C28 has been determined on the basis of electron-phonon interaction potential.
Results of researches on radiation monitoring of oil and gas production enterprises of limited liability company "Gazlineftgasdobicha" (Gazli town, Uzbekistan) and JV «Uz-Kor Gas Chemical» LLC, «Ustyurt Gas and Chemical…
The work is devoted to study of the magnetic properties of compounds based on double vanadates of rare earth elements. It is shown that the presence of vanadium V+4 in compounds causes the paramagnetic properties. It is…
Using statistical Monte-Carlo photon-tracing method, we numerically studied focal spot structure of flat Fresnel lens. It has been shown that due to dispersion effect, focal spot structure changes considerably. In…