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Articles 1 - 16 of 16
Full-Text Articles in Physical Sciences and Mathematics
Computer Simulation Of Adsorption Of C60 Fullerene Molecule On Reconstructed Defective Si(100) Surfacee Content Of The Body Element Is Displayed In Your Browser, I. Urolov, Ishmumin Yadgarov, Ganiboy Raxmanov
Computer Simulation Of Adsorption Of C60 Fullerene Molecule On Reconstructed Defective Si(100) Surfacee Content Of The Body Element Is Displayed In Your Browser, I. Urolov, Ishmumin Yadgarov, Ganiboy Raxmanov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
In this work, based on the molecular dynamics (MD) method, the adsorption processes of C60 fullerene molecules on the reconstructed defective silicon Si(100) surface with different configurations were simulated in the LAMMPS open package program. Second-order Brenner interatomic potential was used to determine interactions between Si-Si, C-C and Si-C atoms. The interaction of various shaped defect areas with the C60 molecule on the surface of reconstructed silicon Si(100) was studied. As a result of calculations, stable adsorption states were determined by comparing the energy of C60 molecule adsorption to the defective silicon Si(100) surface and the Si-C …
Search For The Least Massive Objects In The Hyades Open Cluster With The Help Of A Wide Stellar View, Stanislav Melnikov, Karamat Mirtadjieva
Search For The Least Massive Objects In The Hyades Open Cluster With The Help Of A Wide Stellar View, Stanislav Melnikov, Karamat Mirtadjieva
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
No abstract provided.
Theoretical Study Of The Mechanisms Of Absorption Of Semiconductor Spherical Quantum Dots In The Framework Of Quantum Mechanics, Kamoliddin Qoraboyev, Usmon Sapayev
Theoretical Study Of The Mechanisms Of Absorption Of Semiconductor Spherical Quantum Dots In The Framework Of Quantum Mechanics, Kamoliddin Qoraboyev, Usmon Sapayev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
Analytical expressions for the linear and nonlinear optical susceptibilities of spherical quantum dots are obtained using the Schrödinger equation. To solve the Schrödinger equation, the Nikiforov-Uvarov method was used, assuming that electrons isolated in the medium are associated with the Gelman inverse quadratic potential. Using the density matrix formalism, analytical expressions were obtained for the coefficients of linear and nonlinear absorption and changes in the refractive index of quantum dots. Elements of the matrix of the electric dipole moment l=± 1 and m = 0 are obtained according to the selection rules. To demonstrate the results obtained, we used the …
Self-Aggregation Of C60 Particles In A Volume Of Evaporating Droplets On A Flat Surface, Urol Makhmanov, Abdulmutallib Kokhkharov, Sagdilla Bakhramov, Donats Erts
Self-Aggregation Of C60 Particles In A Volume Of Evaporating Droplets On A Flat Surface, Urol Makhmanov, Abdulmutallib Kokhkharov, Sagdilla Bakhramov, Donats Erts
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
The experimental results on the self-aggregation of fullerene C60 particles in a microvolume of drying droplets of a colloidal solution of fullerene on a solid substrate are presented. Using methods of scanning electron microscopy and atomic force microscopy, it was shown that in the volume of an evaporating droplet of a solution of fullerene C60 in xylene, deposited on the surface of a flat silicon substrate at room temperature, nanostructured and porous mC60 aggregates of quasispherical and elongated spherical shapes with geometrical sizes in average diameter up to D≈4000 nm are synthesized. It is established that an …
Intermolecular Dynamics Of Condensed State: Study Of Temperature Effect On Anisotropy Relaxation By Vibration Spectroscopy, Bakhodir Eshchanov, Shavkat Otajonov, Jurat Gayipov, Dilafruz Xudoyberdiyeva, Sarvarbek Qurbanbayev
Intermolecular Dynamics Of Condensed State: Study Of Temperature Effect On Anisotropy Relaxation By Vibration Spectroscopy, Bakhodir Eshchanov, Shavkat Otajonov, Jurat Gayipov, Dilafruz Xudoyberdiyeva, Sarvarbek Qurbanbayev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
As a result of the experimental study of the spectra of anisotropic scattering of light, a character of orientation movement of molecules in aromatic hydrocarbons has been analyzed. The obtained results have been interpreted from the viewpoint of a model of inhibited rotation and the contributions of the rotational and vibrational degrees of freedom to a molecule spectrum have been estimated. With increasing temperature of liquids under study and approaching a critical state, the rotational degrees of freedom "freeze", and the vibrational degrees have become more significant.
Complex Diffusion Monte-Carlo Method: Test By The Simulation Of The 2d Fermions, Bakhodir Abdullaev, Mirzayousuf Musakhanov, Atsushi Nakamura
Complex Diffusion Monte-Carlo Method: Test By The Simulation Of The 2d Fermions, Bakhodir Abdullaev, Mirzayousuf Musakhanov, Atsushi Nakamura
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
On the base of the diffusion Monte-Carlo method we develop the method allowing to simulate the quantum systems with complex wave function. The method is exact and there are no approximations on the simulations of the module and the phase of the system's wave function. In our method averaged value of any quantity have no direct contribution from the phase of distribution function but only from the phase of the Green function of diffusion equation. We test the method by the simulations of the ground state of fermions in two-dimensional parabolic well. Anyons are used for the representation of the …
Photocatalytic Performance Of V2O5 Nanoparticles Incorporated Tio2 Nanotubes As A Visible-Light Active Photoelectrodefor Water Splitting, Ulugbek Shaislamov, Kamil Mukimov, Turgunali Akhmadjanov
Photocatalytic Performance Of V2O5 Nanoparticles Incorporated Tio2 Nanotubes As A Visible-Light Active Photoelectrodefor Water Splitting, Ulugbek Shaislamov, Kamil Mukimov, Turgunali Akhmadjanov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
Herein we demonstrate brief investigation results of photoelectrochemical performance of TiO2 nanotube (NT) based photoelectrode incorporated with V2O5 nanopaerticles (NP). Photoelectrodes were composed of TiO2 NTs with a diameter of 100 nm and length of 8µm,that were prepared by electrochemical anodization process at 35V in a formamade based electrolyte. The V2O5 nanoparticles were formed on the walls of the TiO2 NTs by deep coating technique with an average size of ∼5-10 nm. The V2O5NP incorporated TiO2NTs show superior light absorption properties in the …
On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, Zahriddin Muminov, Shukhrat Lakaev
On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, Zahriddin Muminov, Shukhrat Lakaev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
On the d-dimensional lattice 𝕋d, d= 1, 2 the discrete Schrödinger operator Hλµ with non-local potential constructed via the Dirac delta function and shift operator is considered. The dependency of negative eigenvalues of the operator on the parameters is explicitly derived.
On The Number Of The Discrete Spectrum Of Two-Particle Discrete Schröodinger Operators, Zahriddin Muminov, Utkir Kuljanov, Shukhrat Alladustov
On The Number Of The Discrete Spectrum Of Two-Particle Discrete Schröodinger Operators, Zahriddin Muminov, Utkir Kuljanov, Shukhrat Alladustov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
We consider a family of discrete Schrö dinger operators hd(k), where k is the two-particle quasi-momentum varying in 𝕋d=(−π,π]d , associated to a system of two-particles on the d - dimensional lattice ℤd, d>1. The CwikelLieb-Rozenblum (CLR)-type estimates are written for hd(k) when the Fermi surface Ek-1(𝔢m(k)) of the associated dispersion relation is a one point set at em(k), the bottom of the essential spectrum. Moreover, when the Fermi surface Ek-1(𝔢m(k)) is of dimension d−1 or d−2, we …
On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, Zahriddin Muminov, Shukhrat Lakaev
On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, Zahriddin Muminov, Shukhrat Lakaev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
On the d-dimensional lattice 𝕋d, d= 1, 2 the discrete Schrödinger operator Hλµ with non-local potential constructed via the Dirac delta function and shift operator is considered. The dependency of negative eigenvalues of the operator on the parameters is explicitly derived.
Investigation Of Isomer Ratios In The Reactions (Γ, N) And (N, 2N) On Nuclei 76Ge And 82Se, Satimbay Palvanov, Turgunali Akhmadzhanov
Investigation Of Isomer Ratios In The Reactions (Γ, N) And (N, 2N) On Nuclei 76Ge And 82Se, Satimbay Palvanov, Turgunali Akhmadzhanov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
The method of the induced activity measured the isomeric yield ratios and cross-sections ratios of reactions (γ, n) and (n, 2n) on nuclei 76Ge and 82Se. Samples of natural have been irradiated in the bremsstrahlung beam of the betatron SB-50 of National University of Uzbekistan in the energy range of 10-35 MeV with energy step of 1 MeV. For 14 MeV neutron irradiation, we used the NG-150 neutron generator of Institute of Nuclear Physics. The gamma spectra reactions products were measured with a spectroscopic system consisting of HPGe detector CANBERRA with energy resolution …
Strain Effect On The Electronic Transport Properties Of Carbyne, Gofur Eshonqulov, Golibjon Berdiyorov, Hicham Hamoudi
Strain Effect On The Electronic Transport Properties Of Carbyne, Gofur Eshonqulov, Golibjon Berdiyorov, Hicham Hamoudi
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
Quantum transport calculations are conducted using density functional theory in combination with Green's functional formalism to study the effect of external strain on the electronic transport properties of carbyne, 1D carbon allotrope, which has recently received a revival of interest due to its extraordinary mechanical, thermal and electronic properties. The current in the system increases monotonically by increasing the compressive strain, whereas the tensile strain results in the reduction of the charge transport. The obtained results are explained by spatial variations of the electrostatic potential along the carbon chain and nanoscale localization of the charge carriers. These findings can be …
Periodic Table Of Elements, Mendeleev's Periodic Table: History, Achievements And Problems, Boris Oksengendler, Kamil Mukimov, Renat Letfullin, Nigora Turaeva, Gulmurza Abdurakhmanov, Shavkat Yuldashev
Periodic Table Of Elements, Mendeleev's Periodic Table: History, Achievements And Problems, Boris Oksengendler, Kamil Mukimov, Renat Letfullin, Nigora Turaeva, Gulmurza Abdurakhmanov, Shavkat Yuldashev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
This paper, devoted to the yubilee of Mendeleev's table, deals with a set of historical and physico-chemical problems related it. Basing on the evolutional approach to the development of the concept of “elements and structure” and up to the appearance of the notion “complexity” we discuss the applicability of Mendeleev's table to the understanding of modern aspects of science such as “nano”, “fractals”, “synergetics” and “hirality”. The problems which are open for further research are revealed and the particular importance of their development for the condensed matter science of living and nonliving matter is pointed out.
Electronic Specific-Heat Anomalies In High-TC Cuprates, S. Dzhumanov, E. Karimboev, B. Yavidov
Electronic Specific-Heat Anomalies In High-TC Cuprates, S. Dzhumanov, E. Karimboev, B. Yavidov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
In this work, we study the electronic specific heat $C_e(T)$ of underdoped to overdoped high-$T_c$ cuprates, and identify the nature of anomalies in $C_e(T)$ at the superconducting transition temperature $T_c$ and at temperatures above $T_c$. The doped cuprate superconductor is considered as a multi-carrier model system which is composed of different types of charge carriers. The normal-state electronic specific heat $C_n(T)$ of high-$T_c$ cuprates below a characteristic pseudogap (PG) temperature $T^*$ is calculated taking into account three contributions coming from the excited components of Cooper pairs, the ideal Bose-gas of incoherent Cooper pairs and the unpaired carriers in the impurity …
Analysis Of Clusterization Of C70 Molecules In Benzene Solutions Prepared By Various Methods, U. Makhmanov, O. Ismailova, A. Kokhkharov, S. Bakhramov
Analysis Of Clusterization Of C70 Molecules In Benzene Solutions Prepared By Various Methods, U. Makhmanov, O. Ismailova, A. Kokhkharov, S. Bakhramov
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
Self-assembling features of molecules of C70 in benzene solution prepared in two various ways – equilibrium and non-equilibrium – has been investigated experimentally by method of high-resolution transmission electron microscopy. It was demonstrated, that the formation of densely packed monomolecular fullerene aggregates with a diameter of not more than 30 nm in solutions prepared by the equilibrium method (without the use of external mechanical influences on solution). In the case of solutions C70, which were prepared by the non-equilibrium method (stirring of solution of C70 by a mechanical rotator), large quasispherical aggregates of nanoporous structure with …
Electron Exchange Between Impurity Centers Of Tin In Pbs And Pbse, S. Zaynabiddinov, K. Bobokhujaev
Electron Exchange Between Impurity Centers Of Tin In Pbs And Pbse, S. Zaynabiddinov, K. Bobokhujaev
Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences
Electron exchange between neutral and doubly ionized U-minus centers of tin in par-tially compensated solid solutions Pb1-xSnxS and Pb1-xSnxSe has been investigated using 119mmSn(119mSn) emission Mössbauer spectroscopy. The activation energy of the process for Pb1-xSnxS solid solutions is 0.11 ± 0.02 eV and is comparable to the depth of energy levels of tin in the PbS band gap, while the activation energy of this process for Pb1-xSnxSe solid solutions is comparable to the activation energy of donor U-minus centers …