Abstract This paper represents a preface to the Proceedings of the XII International Conference on Mathematics, Science and Technology Education (ICon-MaSTEd 2020) held at the Kryvyi Rih State ...Pedagogical University, Ukraine, 15–17 October 2020. Background information and the organizational structure of the meeting, and acknowledgements of the contributions of the many people who made the conference a success are presented.
Abstract
Career guidance quests that involve solving intellectual and search problems in a game are associated with one’s future career, being one of modern means of recruiting school leavers to ...vocational and higher educational institutions. Such specific computer tools of virtual and augmented reality as pupils’ mobile Internet gadgets can enhance visual character and interactivity of quest problems. The article deals with applying augmented reality in the web environment to solving these tasks. The authors propose a prototype of a career guidance quest system using WebAR technology.
Abstract This paper introduces the Proceedings of the XV International Conference on Mathematics, Science and Technology Education (ICon-MaSTEd 2023), which took place at the Kryvyi Rih State ...Pedagogical University, Ukraine, from 17 to 19 May 2023. It provides background information and the organizational structure of the conference, as well as the structure of the proceedings. It also acknowledges the many people who contributed to the success of the conference.
Th-T-Al system, where T-3d transition metals, was studied at ThT2Al20 stoichiometry to establish the influence of T on the structural stability of ternary aluminide formed. Different alloys were ...prepared, varying T in the row from Ti to Fe. Using electron microscopy and X-ray diffraction methods it was found that ThT2Al20 phase adopts CeCr2Al20 structure type when T = Ti, V, and Cr. Starting from Mn, the symmetry of the stable Al-rich phase, which forms in the alloys with the same composition, decreases from cubic to orthorhombic. The results of Density Functional Theory (DFT) calculations coincide with experiments. Concepts of the Theory of Coordination Compounds and Jahn–Teller effect were used to explain the observed abrupt change of the symmetry. These considerations were supported by DFT calculations.
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•Type of transition metal influences symmetry change in the ThT2Al20 alloys.•It was found that cubic ThT2Al20 phase is stable for T = Ti, V and Cr.•When T = Mn, Fe–Al + orthorhombic ThT2Al10 are formed, lowering the symmetry.•Experimental results and DFT calculations were in full agreement.•TCC and of Jahn–Teller effect were used for explanation of the results.
Porous materials occupy an important place among the materials of electronic equipment. Nanopores, which are obtained by ion irradiation of materials, have a complex internal structure that depends ...on the interaction of fast ions with the substance. Obtaining such structures is important, in particular, in the manufacture of biosensor devices based on them. The most effective methods of studying their properties are computer simulations. However, effective computer models of track structures, necessary for the development and improvement of modern biosensors, are not being created actively enough. The approach proposed here involves a detailed study of the interaction of ion flows with the inner surface of the nanotrack. This approach takes into account the structural features of the inner surface of the track as well as the role of adsorption and scattering centers and other local centers. In the existing approaches, the processes mentioned above are mainly described phenomenologically, which does not indicate the ways of modifying the characteristics of the material that is necessary for the device improvement.
Abstract
This paper represents a preface to the Proceedings of the XIV International Conference on Mathematics, Science and Technology Education (ICon-MaSTEd 2022) held at the Kryvyi Rih State ...Pedagogical University, Ukraine, 18-20 May 2022. Background information and the organizational structure of the meeting, proceedings structure, and acknowledgments of the contributions of the many people who made the conference a success are presented.
Computer model of track biosensor Donchev, I.I.; Kavetskyy, T.S.; Mushynska, O.R. ...
Semiconductor physics, quantum electronics, and optoelectronics,
12/2022, Volume:
25, Issue:
4
Journal Article
Peer reviewed
Open access
Being based on the known model of a cylindrical nanopore created using the classical method of molecular dynamics, we have studied the patterns of electrolyte flow passing through a nanocylinder, ...which is used to simulate an ion-induced track in a thin film. In this study, the nanotrack model takes into account the defect structure of the nanotracks inner surface. A model of a structural defect, which is an adsorption center for model particles passing through a nanocylinder, has been described. It was revealed the sensitivity of the electrolyte flux density to its composition, which is explained by interaction of particles passing through the nanocylinder with structural defects of its inner surface. This effect enables to create a biosensor system for detecting the low concentration of impurities of various types in liquid.
Th-T-Al system, where T-3d transition metals, was studied at ThT sub(2)Al sub(20) stoichiometry to establish the influence of T on the structural stability of ternary aluminide formed. Different ...alloys were prepared, varying T in the row from Ti to Fe. Using electron microscopy and X-ray diffraction methods it was found that ThT sub(2)Al sub(20) phase adopts CeCr sub(2)Al sub(20) structure type when T = Ti, V, and Cr. Starting from Mn, the symmetry of the stable Al-rich phase, which forms in the alloys with the same composition, decreases from cubic to orthorhombic. The results of Density Functional Theory (DFT) calculations coincide with experiments. Concepts of the Theory of Coordination Compounds and Jahn-Teller effect were used to explain the observed abrupt change of the symmetry. These considerations were supported by DFT calculations.
The paper considers the stability of the phases formed in alloys of aluminum with transition metals (TM) in terms of the theory of coordination compounds. The structural stability is related to the ...degree of distortion of the first-neighbor coordination icosahedra commonly found around TM atoms. Changes in the symmetry of coordination polyhedrons are explained in terms of the Jahn–Teller theorem. The stability of the structures may be correlated with the effective charge of the TM atom and with the electronegativity of its neighbors: the phase transforms to the structure with lower symmetry when the electronegativity or effective charge decrease.
The standard model of particle physics
describes the known fundamental particles and forces that make up our Universe, with the exception of gravity. One of the central features of the standard model ...is a field that permeates all of space and interacts with fundamental particles
. The quantum excitation of this field, known as the Higgs field, manifests itself as the Higgs boson, the only fundamental particle with no spin. In 2012, a particle with properties consistent with the Higgs boson of the standard model was observed by the ATLAS and CMS experiments at the Large Hadron Collider at CERN
. Since then, more than 30 times as many Higgs bosons have been recorded by the ATLAS experiment, enabling much more precise measurements and new tests of the theory. Here, on the basis of this larger dataset, we combine an unprecedented number of production and decay processes of the Higgs boson to scrutinize its interactions with elementary particles. Interactions with gluons, photons, and W and Z bosons-the carriers of the strong, electromagnetic and weak forces-are studied in detail. Interactions with three third-generation matter particles (bottom (b) and top (t) quarks, and tau leptons (τ)) are well measured and indications of interactions with a second-generation particle (muons, μ) are emerging. These tests reveal that the Higgs boson discovered ten years ago is remarkably consistent with the predictions of the theory and provide stringent constraints on many models of new phenomena beyond the standard model.
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