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Guliev S.M.,Azerbaijan State Pedagogical University
Journal of Applied Mechanics and Technical Physics | Year: 2012

The problem of fracture mechanics on nucleation of cracks emanating from circular contours of holes of perforated isotropic solids under longitudinal shear is under consideration. The solution of the equilibrium problem of a perforated solid under longitudinal shear with prefracture zones is reduced to solving an infinite algebraic system and a nonlinear singular integrodifferential equation with a kernel of the Cauchy type. Forces in crack nucleation zones are found by solving these equations. The condition of crack emergence is formulated taking into account the criterion of the limiting discontinuity of material displacements. © 2012 Pleiades Publishing, Ltd. Source

Mammadhasan E.M.,Azerbaijan State Pedagogical University
2011 5th International Conference on Application of Information and Communication Technologies, AICT 2011 | Year: 2011

In this paper mistakes occurring in the process of training ICT and ways to correcting these mistakes are studied and given advices. © 2011 IEEE. Source

Zalov A.Z.,Azerbaijan State Pedagogical University
Journal of Analytical Chemistry | Year: 2015

The complexation of tungsten(VI) with 2-hydroxy-5-chlorothiophenol in the presence of diphenylguanidine is studied by spectrophotometry. Optimal conditions for the formation and extraction of the complex are determined. It is found that a mixed-ligand complex is formed at pH 5–6. Chloroform and dichloroethane are the best extractants. Some physicochemical characteristics of the mixed-ligand complex are determined; the molar absorption coefficient at 480 nm is 5.6 × 104. The molar ratio of components in the complex is 1: 2: 2. © 2015, Pleiades Publishing, Ltd. Source

Afanas'ev M.S.,RAS Institute of Radio Engineering and Electronics | Nabiev A.E.,Azerbaijan State Pedagogical University | Chucheva G.V.,RAS Institute of Radio Engineering and Electronics
Physics of the Solid State | Year: 2015

A method of optical monitoring of deposition of ferroelectric Ba0.8Sr0.2TiO3 films grown by highfrequency reactive plasma-enhanced chemical deposition has been considered. The studies of the plasma in the optical range have demonstrated that the emission spectrum at wavelengths λ > 450 nm is not changed in the range of bias voltages. At λ = 300–400 nm, a correlation takes place between the emission spectra of the film-forming medium obtained at different target–substrate voltages. The mass spectra of the film-forming medium indicate that, at bias voltages U = 350–600 V, the gaseous phase mainly contains ionized particles with the mass numbers of 220–240, which are close to the molar mass of Ba0.8Sr0.2TiO3± x At U > 650 V, the gaseous phase contains ions with mass numbers corresponding to the chemical compositions of the target components BaTiO3, SrTiO3, BaO, and SrO, along with multiatomic particles. It has been shown that a transition layer enriched in the substrate material exists at the interface. It has been found that the monitoring of the film-forming medium and the time factor make it possible to reproducibly grow nanosized films with given crystal-chemical parameters. © 2015, Pleiades Publishing, Ltd. Source

Hasanov K.A.,Azerbaijan State Pedagogical University | Huseynov J.I.,Azerbaijan State Pedagogical University | Dadashova V.V.,Baku State University | Aliyev F.F.,Azerbaijan Academy of Sciences
Semiconductors | Year: 2016

The theory of phonon-drag thermopower resulting from a temperature gradient in the plane of a two-dimensional electron gas layer in a parabolic quantum well is developed. The interaction mechanisms between electrons and acoustic phonons are considered, taking into account potential screening of the interaction. It is found that the effect of electron drag by phonons makes a significant contribution to the thermopower of the two-dimensional electron gas. It is shown that the consideration of screening has a significant effect on the drag thermopower. For the temperature dependence of the thermopower in a parabolic GaAs/AlGaAs quantum well in the temperature range of 1–10 K, good agreement between the obtained theoretical results and experiments is shown. © 2016, Pleiades Publishing, Ltd. Source

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