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Search Results: 1 - 10 of 213 matches for " Dmytro Ivanovych Bletskan "
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Photoelectric Properties of Crystalline and Glassy PbGeS3  [PDF]
Dmytro Ivanovych Bletskan, Vasyl Mykolaiovych Kabatsii
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2013, DOI: 10.4236/ojinm.2013.33006

The integrated investigations of the stationary characteristics of photoconductivity (the spectral distribution of photoconductivity (PC), luminous-ampere characteristics (LAC), temperature dependences of dark photoconductivity) and the thermostimulated current (TSC) for crystalline and glassy lead thiogermanate (PbGeS3) were performed. It was determined, as a function of crystals growing rate, there are one or two impurity maxima except for the native one in photoconductivity spectra. For the glassy lead thiogermanate in the range of wave lengths of 0.4 - 1.0 μm in PC spectra was revealed the hysteresis at the change of direction wave lengths sweep of incident light, conditioned by the phenomenon of induced impurity conductivity. The activation of PC, caused by thermal emptying of attachment levels, was observed on the temperature dependences of photoconductivity.

Electronic Structure of Sodium Thiogermanate  [PDF]
Dmytro Ivanovych Bletskan, Vasyl Vasyliovych Vakulchak, Vasyl Mykolaiovych Kabatsii
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2015, DOI: 10.4236/ojinm.2015.52004
Abstract: Ab initio calculations of the band structure, total and partial densities of states and the spatial distribution of the electron charge density of crystalline Na2GeS3 are performed in the framework of density functional theory in the local density approximation for an exchange-correlation potential. According to the calculation results, sodium thiogermanate is a direct-gap crystal with the top of the valence band and the bottom of the conduction band at the \"\"point of the Brillouin zone. The calculated band gap is Eg= 2.51 eV. The nature of the components of the electronic states in different subbands of the valence band is determined. The calculated total density of states in the valence band of the crystal is compared with the known experimental X-ray photoelectron spectrum of Na2GeS3 glass. Based on the maps of the electron density distribution, the nature of the chemical bonds and high mobility of Na+ ions in Na2GeS3 crystal is analyzed.
Deficit of the budget: essence, reasons and management
Mashko, Andriy Ivanovych
Socìal?no-ekonomì?nì Problemì ì Der?ava , 2012,
Abstract: The article is devoted to the problem of deficit of the state budget in the conditionsof forming the socially directed market economy. The economic essence and the basic factors ofexistence of negative balance of the budget have been interpreted and identified. The conditions ofthe use of deficit of the state budget as the instrument of influence on economic processes have beendetermined.The purpose lies in principles of forming the deficit of budget and developingrecommendations in relation to the increasing management efficiency.The basic task of the scientific article is to investigate the economic essence and identify theprincipal reasons for deficit of budget.
Scientific-technical activities of small business (foreign experience)
Stoyko, Igor Ivanovych
Socìal?no-ekonomì?nì Problemì ì Der?ava , 2011,
Abstract: The analysis of small firms in foreign countries, their contribution to scientific and technical development, sources of financing and carrying out a niche in research and development work.
Methodical approach to management of investment projects providing innovative development
Shchukin, Olexandr Ivanovych
Socìal?no-ekonomì?nì Problemì ì Der?ava , 2011,
Abstract: Presents the characteristics, problems and methods of management of investment projects innovatsionoho software development that are based on assessing the market situation, competitiveness, forming project portfolio depending on the chosen market segment, strategic areas of management and increase the level of investment and innovation capacity of relevant portfolio strategy investment and innovation development of industrial enterprise.
Photovoltaic Sensor for the Solar Battery Guidance on the Sun Based on GeS:Sb Layered Crystals  [PDF]
D. I. Bletskan, V. M. Kabatsii, M. M. Bletskan
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2016, DOI: 10.4236/ojinm.2016.62002
Abstract: Photovoltaic tracking sensor monitoring the position of the sun in the sky was developed on the basis of GeS:Sb layered crystals. The operating principle of this sensor is based on the phenomenon of photovoltaic effect in GeS:Sb crystals; the magnitude and sign of generated photo-emf depend on the position of the light probe relative to the ohmic contacts, deposited on (001) surface of the crystal.
Analysis of Dynamics of Boundary Shape Perturbation of a Rotating Elastoplastic Radially Inhomogeneous Plane Circular Disk: Analytical Approach  [PDF]
Dmytro М. Lila, А. А. Martynyuk
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.35068
Abstract: For a rotating inhomogeneous circular disk a way of calculating dynamics of boundary shape perturbation and failure of bearing capacity is proposed in terms of small parameter method. Characteristic equation of plastic zone critical radius is obtained as a first approximation. A formula of critical angular velocity is derived which determines the stability loss of the disc according to the self-balanced form. Efficiency of the proposed method is shown by an illustrative example considered in Section 7. Values of critical angular velocity of rotation are found numerically for different parameters of the disc.
Estudos s?bre Longicórneos Neotrópicos (Coleoptera, Cerambycidae)
Zajciw, Dmytro;
Memórias do Instituto Oswaldo Cruz , 1958, DOI: 10.1590/S0074-02761958000200014
Abstract: in this paper, based on the study of the materials of the collections belonging to dr. c. a. campos seabra and the author's own, the author gives the additional characters of the rare species volxemia dianella lam., sthelenus braconimus bates and sth. ichneumoneus buq., the redescription of the genus xenocrasis bates, the descriptions of allotypes of the males of brasilianus testaceicornis melz., xenocrasis badeni bates and oncideres castanea dill. & dill., and the key for the determination of the species colobothea serv. with 6 (8) pale spots on the elytra. all these species are from brazil.
Novos longicórneos neotrópicos: XIII. (Col., Cerambycidae, Cerambycinae)
Zajciw, Dmytro;
Memórias do Instituto Oswaldo Cruz , 1967, DOI: 10.1590/S0074-02761967000200006
Abstract: the author describes one new genus, dihammaphoroides allied to dihammaphora chevr., 1859 and tree new species: coleoxestia omega, approximate to bivittata (buq., 1852), ommata (eclipta) melzeri resembling castanea bat., 1873 and dihammaphoroides sanguinicollis, all from brazil, prov. rio de janeiro, national park itatiaia, collected by j. f. zikan.
Dmytro Myeshkov
Magister Dixit , 2012,
Abstract: The article deals with the history of the Soviet policy in manpower management in the first two post-war decades on an example of two Russian regions – Sverdlovsk region and Stavropol Krai. The purpose is to analyze the problem of provision agriculture with qualified personnel during de-Stalinization of public life of able-bodied population migration, including mass migrations of rural youth to the cities. In the 1950th – the beginning of the 1960th country leaders undertook measures for regulation of labor migrations. Thus the new methods gradually come to change to mobilization character of policy in relation to manpower reserves, urged to raise appeal of agricultural work and quality of the village life. Not only party and state authorities, but also local writers, and also local mass media were involved in this work.
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