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Features Of The Implementation Of Distance Education Institutions Of Higher Education In Ukraine
Soroka, Maryna,Shtefiuk, Valeriia,Tatarenko, Maryna,Babchenko, Yanina,Ivashchenko, Irina International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.11
The article clarifies and divorces the concepts of distance learning systems "distance learning", "distance education", "distance technologies", "open education". The central concept of the DO system is "distance learning"; - an assessment of the use of distance technologies in the system of higher professional education in Ukraine was carried out, which showed that the dominant teaching technology at the moment is the technology of teaching using cases (case technology on paper and electronic media). It is determined that distance technologies based on the active use of technical teaching aids (network technologies, telecommunication technologies) find little use in the system of higher professional education in Ukraine.
Molecular Beam Epitaxy Growth of ZnTe/ZnSe Type-II Quantum Dots
Rita Najjar,Regis Andre,Lucien Besombes,Catherine Bougerol,Henri Mariette,Serge Tatarenko 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
We have performed a detailed study of the growth conditions of ZnTe strained on ZnSe to form nanometer-scale islands. We determined that the critical thickness for strain relaxation was 2 ML, rapidly followed by the onset of surface undulations due to a layer instability. Nevertheless, the changes in the surface morphology were not marked enough if the purpose was to obtain quantum dots. Finally, we present an ecient technique to form ZnTe islands with a typical base extension of 25 nm and a height of 3 nm. We have performed a detailed study of the growth conditions of ZnTe strained on ZnSe to form nanometer-scale islands. We determined that the critical thickness for strain relaxation was 2 ML, rapidly followed by the onset of surface undulations due to a layer instability. Nevertheless, the changes in the surface morphology were not marked enough if the purpose was to obtain quantum dots. Finally, we present an ecient technique to form ZnTe islands with a typical base extension of 25 nm and a height of 3 nm.
Magnetic resonance in bilayers of ferrite and functionally graded piezoelectric
Bichurin, M.I.,Petrov, R.V.,Petrov, V.M.,Saplev, A.F.,Tatarenko, A.S.,Kovalenko, D.V.,Melnichuk, D.G.,Yang, Su-Chul Elsevier 2017 Materials research bulletin Vol.96 No.3
<P><B>Abstract</B></P> <P>The particular purpose of this paper is theoretical modeling of magnetoelectric interactions at the ferromagnetic resonance in a layered structure of a ferrite and a piezoelectric with through-thickness graded polarization. We show that using the functionally graded piezoelectric with through-thickness variation of polarization can lead to an electric field induced broadening of ferromagnetic resonance line. As an example, we consider the laminate based on the yttrium iron garnet layer which is placed between two lead zirconate titanate layers with different poling direction. The maximal ferromagnetic resonance line broadening of 9.3Oe is obtained for the yttrium iron garnet to lead zirconate titanate layer thickness ratio of 1.7 at 9.3GHz for E equal to 10kV/cm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ferromagnetic resonance in a ferrite-piezoelectric laminate is studied. </LI> <LI> An electric field induced FMR line broadening results from bending the sample. </LI> <LI> Ferrite layer between the two piezoelectric layers shows a large line broadening. </LI> </UL> </P>