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Rudenko, Yuliya,Drushlyak, Marina,Osmuk, Nataliia,Shvets, Olha International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.1
The development and spread of IT-technologies has raised interest in teaching programming pupils. The article deals with problems related to programming and ways to overcome them. The importance of programming skills is emphasized, as this process promotes the formation of algorithmic thinking of pupils. The authors determined the level of pupils' interest to programing learning depending on the age. The analysis has showed that the natural interest of younger pupils in programming is decreasing over the years and in the most productive period of its study is minimized. It is revealed that senior school pupils are characterized by low level of interest in the study of programming; lack of motivation; the presence of psychological blocks on their own abilities in the context of programming; law level of computer science understanding. To overcome these problems, we conducted the second stage of the experiment, which was based on a change in the approach to programing learning, which involved pupils of non-specialized classes of senior school (experimental group). During the study of programming, special attention was paid to the motivational and psychological component, as well as the use of game technologies and teamwork of pupils. The results of the pedagogical experiment on studying the effectiveness of teaching programming for pupils of nonspecialized classes are presented. Improvement of the results provided the use of social and cognitive motives; application of verbal and non-verbal, external and internal means; communicative attacks; stimulation and psychological setting; game techniques, independent work and reflection, teamwork. The positive effect of the implemented methods is shown by the results verified by the methods of mathematical statistics in the experimental and control groups of pupils.
Magnetotransport and Trapping of Magnetic Domain Walls in Spin Valves With Nanoconstrictions
Noh, S. J.,Chun, B. S.,Wu, H. C.,Shvets, I. V.,Chu, I. C.,Abid, M.,Serrano-Guisan, S.,Kim, Y. K. IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>In a magnetic nanowire, a magnetic domain wall (DW) can move along the wire when an applied magnetic field or a spin-polarized current is applied. A magnetic spin-valve device composed of two nanowires connected by a nanosized constriction was prepared, on which the presence of a pinned DW by nanoconstriction was detected by giant magnetoresistance effect. When the magnetic wire has a nanoconstriction, the DW configuration and width were largely affected by the shape of nanoconstriction. An asymmetric magnetotransport behavior observed in the experiments was interpreted by a micromagnetic modeling study.</P>
Interplay Between Optical Bianisotropy and Magnetism in Plasmonic Metamolecules
Sun, Liuyang,Ma, Tzuhsuan,Yang, Seung-Cheol,Kim, Dong-Kwan,Lee, Gaehang,Shi, Jinwei,Martinez, Irving,Yi, Gi-Ra,Shvets, Gennady,Li, Xiaoqin American Chemical Society 2016 Nano letters Vol.16 No.7
<P>The smallness of natural molecules and atoms with respect to the wavelength of light imposes severe limits on the nature of their optical response. For example, the well-known argument of Landau and Lifshitz and its recent extensions that include chiral molecules show that the electric dipole response dominates over the magneto-electric (bianisotropic) and an even smaller magnetic dipole optical response for all natural materials. Here, we experimentally demonstrate that both these responses can be greatly enhanced in plasmonic nanoclusters. Using atomic force microscopy nanomanipulation technique, we assemble a plasmonic metamolecule that is designed for strong and simultaneous optical magnetic and magneto-electric excitation. Angle-dependent scattering spectroscopy is used to disentangle the two responses and to demonstrate that their constructive/destructive interplay causes strong directional scattering asymmetry. This asymmetry is used to extract both magneto-electric and magnetic dipole responses and to demonstrate their enhancement in comparison to ordinary atomistic materials.</P>
Use of Innovation and Information Technologies In Music Lessons
Potapchuk, Tetiana,Fabryka-Protska, Olga,Gunder, Liubov,Dutchak, Violetta,Osypenko, Yaroslav,Fomin, Kateryna,Shvets, Nataliia International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.12
The processes of informatization of the modern educational space are inextricably linked with the active introduction of innovative information technologies, which diversify the forms of education and upbringing. The use of these technologies in education due to their specific properties significantly enhances the clarity of learning, emotional impact on students, helps to deepen interdisciplinary links, intensifies students' work, and improves the organization of educational activities. Innovative information technologies offer new opportunities for the use of text, audio, graphic, and video information in lessons, enriching the methodological possibilities of the lesson. Today, the use of these technologies is becoming an integral part of the study of any subject. Using multimedia presentations, publications, and websites created by students in the learning process, they can develop learning skills. According to researchers, there are many multimedia programs for working with a computer in a music lesson, namely: a music player, a program for singing karaoke, a music constructor, music encyclopedias, and training programs. The introduction of innovative information technologies in the system of music education allows expanding learning opportunities.
Thakur, P.,Kumar, R.,Cezar, J.C.,Brookes, N.B.,Sharma, A.,Arora, S.K.,Gautam, S.,Kumar, A.,Chae, K.H.,Shvets, I.V. North Holland 2011 Chemical physics letters Vol.501 No.4
We report on the element-specific magnetic characterization of Ni nanoparticles (NPs) embedded in Al<SUB>2</SUB>O<SUB>3</SUB> (001) matrix prepared by ion-implantation (Ni:5x10<SUP>16</SUP>-2x10<SUP>17</SUP>ionscm<SUP>-2</SUP>) technique. The X-ray diffraction studies reveal the coexistence of fcc Ni NPs of average size ~8-19nm along with the other NiO<SUB>x</SUB> phases. X-ray magnetic circular dichroism (XMCD) experiments demonstrate the competing nature of magnetic interactions between the Ni NPs and NiO<SUB>x</SUB> phases. The ferromagnetism at 10K (for all the Ni implants) is related to the combined contribution of both phases, while the room temperature superparamagnetism at higher fluence is dominated by Ni NPs phase as confirmed by Ni L<SUB>3,2</SUB> XMCD measurements.
Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials
Coleman, J. N.,Lotya, M.,O'Neill, A.,Bergin, S. D.,King, P. J.,Khan, U.,Young, K.,Gaucher, A.,De, S.,Smith, R. J.,Shvets, I. V.,Arora, S. K.,Stanton, G.,Kim, H.-Y.,Lee, K.,Kim, G. T.,Duesberg, G. S.,H American Association for the Advancement of Scienc 2011 Science Vol.331 No.6017
<P>If they could be easily exfoliated, layered materials would become a diverse source of two-dimensional crystals whose properties would be useful in applications ranging from electronics to energy storage. We show that layered compounds such as MoS(2), WS(2), MoSe(2), MoTe(2), TaSe(2), NbSe(2), NiTe(2), BN, and Bi(2)Te(3) can be efficiently dispersed in common solvents and can be deposited as individual flakes or formed into films. Electron microscopy strongly suggests that the material is exfoliated into individual layers. By blending this material with suspensions of other nanomaterials or polymer solutions, we can prepare hybrid dispersions or composites, which can be cast into films. We show that WS(2) and MoS(2) effectively reinforce polymers, whereas WS(2)/carbon nanotube hybrid films have high conductivity, leading to promising thermoelectric properties.</P>
Rajeevan, N E,Kumar, Ravi,Shukla, D K,Thakur, P,Brookes, N B,Chae, K H,Choi, W K,Gautam, S,Arora, S K,Shvets, I V,Pradyumnan, P P IOP Pub 2009 Journal of physics, an Institute of Physics journa Vol.21 No.40
<P>We report the near-edge x-ray absorption spectroscopy (NEXAFS) at the Co/Mn L-3,L-2 edge and oxygen K edge of the well-characterized Bi-substituted Co2MnO4 multiferroic samples. The evolution of peak features in NEXAFS spectra of the Co/Mn L-3,L-2 edge and O K edge show the Bi-induced redistribution of magnetic cations (Co/Mn). The variation in valence states of Co and Mn in all the substituted compositions is consistent with the observed ferrimagnetic behaviour of the samples. Magnetization data show the decrease in molecular field complementing the ferrimagnetism. The role of Bi in the enhancement of magnetic interactions as well as the appearance of ferroelectricity in BixCo2-xMnO4 (0 <= x <= 0.3) is discussed.</P>
Wu, Yecun,Fuh, Huei-Ru,Zhang, Duan,Coileá,in, Cormac Ó,Xu, Hongjun,Cho, Jiung,Choi, Miri,Chun, Byong Sun,Jiang, Xuju,Abid, Mourad,Abid, Mohamed,Liu, Huajun,Wang, Jing Jing,Shvets, Igor V. Elsevier 2017 Nano energy Vol.32 No.-
<P><B>Abstract</B></P> <P>For applications in wearable human-device interfaces and optoelectronics, flexible materials capable of supporting spatial and uninterrupted bandgap tunability are of immense value. We demonstrate theoretically and experimentally the wide bandgap tunability of GaSe nanosheets, with simultaneous PL enhancement, via elastic strain engineering at room temperature. The elastic strain gives rise to a continuously variable electronic band structure profile, with a rate of 40meV/1%, and a 3-fold enhancement in PL intensity is achieved when a uniaxial strain of 1% is introduced. An additional effect is that a new exciton state arises when the strain is raised beyond 0.6%. This work suggests that strain engineering can effectively modulate/control the generation, separation, transport, and recombination of photo-induced charge carriers in GaSe, making it a valuable material for flexible optoelectronic-mechanical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wide bandgap tunability of GaSe nanosheets, with simultaneous PL enhancement, via elastic strain engineering at room temperature. </LI> <LI> A linear tuning rate of optical band gap of 40 meV/% for uniaxial strain has been achieved, comparable to monolayer MoS2. </LI> <LI> Threefold enhancement in PL intensity achieved with a uniaxial strain of 1%. </LI> <LI> Strain engineering used to control generation, separation, transport, and recombination of photo-induced charge carriers in GaSe. </LI> <LI> New exciton state demonstrated when strain is greater than 0.6%, which shifts in the direction opposite to the main exciton state. </LI> <LI> Suggests route to more efficient capture of optical spectrum, and exciton concentration and trapping by mechanical deformation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>