Реферат: On the basis of the investigation of the asymptotic behavior of the correlation functions of the corresponding field currents with the necessary quantum numbers, the analytic method for the determination of the energy spectrum of the three-body Coulomb system is suggested. Within this framework the analytical approach to determine the energy spectrum of the molecular hydrogen ions in the ground and orbital excited state is used. In our case, relativistic corrections are taken into account by the constituent mass of the constituent particles, as well as by the interaction potential. Our results show that the masses of the constituent particles differ from the masses of the particles in the free state. The increasing of the constituent mass of electron is comparatively larger than the increasing of constituent mass of the proton, deuteron, and triton. The constituent masses of the electron differ between for the molecular ions of hydrogen H2+, D2+, T2+, HD+, DT+, and HT+. Thus, our results on the energy spectrum of molecular hydrogen ions in the ground and excited states show good agreement with the existing results of precision spectroscopy; this is achieved by taking into account the values of the masses of constituent particles.
Microstrain in dispersion-hardened steels
Автор(ы): (Bokuchava G. D.*(Papushkin I. V.*(Sumin V. V.*Aznabayev D. T.*Muhametuly B.*Balagurov A. M.*
Объем документа: С. 245-252
МРНТИ: 29.05.23
Ключевые слова: разрешения дифракции нейтронов*микродеформации стали*стали дисперсно-упрочненные*
Реферат: Using high-resolution neutron diffraction, micro strain was investigated in three series of samples of stainless austenitic dispersion-hardened steels, which are used as various structural reactor components. The effect of temperature and duration of heat treatment on the precipitation of dispersion-hardened phase particles, as well as on lattice parameter changes and micro strain, was studied. In all studied steels an increase in micro strain at coherence failure was observed.
Excited nuclei in neutron star crusts
Автор(ы): Takibayev N. Zh.*Kiyoshi Kato*Nasirova D.*
Объем документа: С. 151-161
МРНТИ: 29.15.33
Ключевые слова: нейтронные звезды*ядерные системы*ядерные структуры звездной динамики*
Реферат: Neutron stars are gold mines for the study of nuclear systems under extreme conditions of density and isospin asymmetry. Spanning many orders of magnitude in density and pressure, neutron stars display exotic phases that cannot be realized under normal laboratory conditions. Whereas the most common perception of a neutron star is that of a uniform system of neutrons packed to densities that may exceed that of normal nuclei, the reality is far more complex and much more interesting. To illustrate this more exciting reality, the editors of this book contacted leaders in the field of neutron-star physics with expertise ranging from nuclear structure to stellar dynamics.
Optical Processes in Nanostructured Semiconductors
Автор(ы): Zhanabaev Z. Zh.*Grevtseva T. Yu.*Danegulova T. B.*Assanov G. S.*
Реферат: We present a possibility to model morphology of surfaces of nanostructured semiconductor films by use of methods of nonlinear physics. We also describe experimental photoluminescence and absorption spectra in nanostructured fractal medium. By use of our theory we describe the new experimental fact of light localization in non-crystalline films. We suggest a fractal model for energy spectra of excitons in nanostructured semiconductors with porous structure. We obtain equations for exciton and multi-exciton energy depending on energy of exciting photon.
Structural Properties of a-Si:H and a-SiC:H Films Controlled in Nanoscale
Реферат: Morphology and structure of hydrogenated amorphous silicon (a-Si:H) and hydrogenated amorphous silicon carbide (a-SiC:H) films were investigated to reveal an influence of the carbon content on the films properties in nanoscale. Thin a-Si:H and a-SiC:H films of different compositions were deposited by plasma enhanced chemical vapor deposition (PECVD) from SiH4 and SiH4 + CH4 gas mixtures. Raman spectroscopy and atomic force microscopy (AFM) were used to analyze the chemical bonds and morphology of the films. It was demonstrated that the carbon introduction in an amorphous network resulted not only in an increase of the optical bandgap of a-Si1-xCx:H films from Eg = 1.72 eV at x = 0 to Eg = 2.18 eV at x = 0.2, but also it led to a decrease of the effective sizes of nanoroughness on the film surfaces. The Raman scattering spectra verified that the amorphous network of a-SiC:H films even with low carbon content became less ordered at short and intermediate nanoscales.
Inversion of the Impurity Conductivity Sign in As2Se3:Bi Films Deposited by Two Different Methods
Автор(ы): Almasov N. Zh.*Prikhod\'ko O. Yu.*Tsendin K. D.*
Реферат: It is demonstrated that As2Se3:Bix films deposited by thermal evaporation have p_type impurity conductivity, whereas films of the same composition, produced by ion_plasma cosputtering in vacuum exhibit n_type impurity conductivity. On the basis of these results, a new method is suggested for the fabrication of p-n homojunctions in film structures made of chalcogenide glassy semiconductors doped with bismuth in various ways.
Switching and memory effects in partly crystallized amorphous Ge2Sb2Te5 films in a current controlled mode
Автор(ы): Almasov N. Zh.*Bogoslovskiy N.*Korobova N.*Kozyukhin S.*Fefelov S.*Kazakova L.*Jakovlev S.*Tsendin K. D.*Guseinov N.*
Реферат: Switching and memory effects in as-deposited amorphous Ge2Sb2Te5 films with a considerable concentration of crystalline nuclei have been investigated. Variation of the phase composition of the sample has been confirmed by Raman spectroscopy data. The influence of nuclei on parameters of the current voltage characteristic has been studied. Significant variation of initial resistance and threshold voltage due to a different nuclei configuration has been observed. In some cases the current voltage characteristic was monotonous i.e. the intrinsic S-shape of the current-voltage characteristic disappeared and memory recording occurred without prior switching. The measurements were made in a current controlled mode which allowed conducting a thorough investigation of switching and current filament formation.
The Diagnostics of Dusty Plasma in RF Discharge by Two Different Methods
Автор(ы): Orazbayev S. A.*Muratov M. M.*Ramazanov T. S.*Dosbolayev M. K.*Silamiya M.*Jumagulov M. N.*(Boufendi L.*
Реферат: This work consists of two parts. First part describes the results of optical spectral diagnostics of dusty plasma of carbonaceous gas mixtures in radio frequency discharge. The change in the emission spectrum of the plasma of mixture of argon and methane with introducing of the dust particles was observed. It was explained by the change in the electron temperature. The same effect was observed in other gases: argon, argon-hydrogen mixture. The second part is about diagnostics of buffer plasma parameters on the basis of dust structure characteristics obtained in the experiments. The possibility of diagnostics of buffer plasma on the basis of experimental data of microscopic characteristics was shown.
Optical Properties of Kelbg-Pseudopotential-Modelled Plasmas
Автор(ы): Arkhipov Yu. V.*Ashikbayeva A. B.*Askaruly A.*Davletov A. E.*Tkachenko I. M.*
Реферат: Simulation data on hydrogen-like plasmas, modelled with the Kelbg pseudopotential, are treated within the classical theory of moments. The possibility is analyzed for the model inverse dielectric function to satisfy five convergent sum rules and other exact relations. The sum rules which are the power frequency moments of the loss function are calculated using the hypernetted chain approximation with the Kelbg interaction potential. An approach to the reconstruction of the Nevanlinna parameter function is proposed and successfully tested against the simulation data. Conclusions on the applicability of the Kelbg potential are drawn and a model is put forward to define the Coulomb dielectric function with the space dispersion taken into account.
Influence of Polarization Phenomena on radial Distribution Function of Dust Particles
Автор(ы): Erimbetova L. T.*Davletov A. E.*Kudyshev Zh. A.*Mukhametkarimov Ye. S.*
Объем документа: С. 414-418
МРНТИ: 29.27.47
Ключевые слова: псевдопотенциальные модели взаимодействия макрочастиц*расчет частиц пыли*гиперцепное приближение*теория электростатических изображений*
Реферат: A pseudopotential model of intergrain interaction in dusty plasmas is proposed to take into account both the electrostatic polarization and the screening phenomena. The derivation is entirely based on the renormalization theory of plasma particles interaction developed previously. Dust particles are assumed to be conductive such that the polarization phenomenon can strictly be treated in the charge-image approximation. Such an assumption imposes no restraint on generality of the present consideration because the polarization effects are essential for accurate description of intergrain interaction potential. The pseudopotential model is then used in the hypernetted chain approximation (HNC) for the dust component to obtain the radial distribution function which reveals the non-monotonic behavior at sufficiently large values of the dust coupling parameter. This can be viewed upon as a short- or even long-range order formation in the dust component of the plasma.