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    Wyświetlanie 1-10 z 10
    Tytuł:
    Raschet verojatnosti otkazov konstruktivnogo älementa sborno-razbornyh legkih metallicheskih konstrukcij
    Distribution of the number of probable failure rates collapsible light metal structures
    Autorzy:
    Shebanin, V.
    Bogza, V.
    Bogdanov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/77838.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Opis:
    Assignment number of failures of structural element precast sectional light metal structures. This article discusses the process of functioning of the element of light metal structures Considering that the time to failure element in the process is a random variable X with the assignment F , and the lifetime of the structure as a whole is a random variable Y with the assignment G .
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2012, 14, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raschet karkasov peremennogo sechenija s gibkojj stenkojj
    Calculation cage ac section with a flexible wall
    Autorzy:
    Shebanin, V.
    Bogza, V.
    Bogdanov, S.
    Hilko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/77364.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    calculation method
    durability
    reliability
    stability
    metal structure
    steel frame
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chislovoj metod opredelenija naprjazhenno-deformirovannogo sostojanija i kriticheskikh nagruzok poteri ustojjchivosti arok
    Analytical and numerical methods definition stress strain state and critical loads loss of stability of arches
    Autorzy:
    Shebanin, V.
    Bogza, V.
    Bogdanov, S.
    Hilko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/76380.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    configuration
    arched structure
    stress-strain state
    critical load
    stability loss
    numerical method
    analytical method
    Opis:
    The method of calculating the critical loss of stability loads of arches. The method is that arbitrary configuration arch replaced by the elastically connected elements for which at the given regular loads with appropriate boundary conditions at the ends of exact solutions are found for components of the stress-strain state.
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxide crystals on the surface of porous indium phosphide
    Autorzy:
    Suchikova, Y. O.
    Bogdanov, I. T.
    Kovachov, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/378528.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    oxide clusters
    electrochemical etching
    indium phosphide
    dislocations
    skupiska tlenków
    trawienie elektrochemiczne
    fosforek indu
    Opis:
    Purpose: f this paper is to is to establish the patterns of oxide formation on the surface of indium phosphide during electrochemical etching of mono-InP. Design/methodology/approach: A porous surface was formed with the anode electrolytic etching. Morphology of the surface was studied with the help of scanning electron microscope JSM-6490. The analysis of chemical composition of porous surface of samples was also performed. Findings: It was shown that during the electrochemical etching of indium phosphide, oxide films and crystallites form on the surface. It has been established that crystalline oxides are formed mainly on the surface of n-type indium phosphide. Continuous oxide films are predominantly formed on the surface of p-InP. Research limitations/implications: The research was carried out for indium phosphide samples synthesized in the solution of hydrofluoric acid, though, carrying out of similar experiments for crystalline oxides on the surface of porous indium phosphide obtained in other conditions, is necessary. Practical implications: The study of oxide crystals on the surface of porous indium phosphide has great practical importance since it is the reproducibility of experimental results that is the main problem of modern materials science, the more nanoengineering. Oxides can significantly affect the properties of materials. On the one hand, oxides significantly affect the recombination properties of materials, this can impair the operation of semiconductor devices. On the other hand, oxide films can serve as a passivating coating for the surface of a porous semiconductor. Such an oxide property will be useful for the practical application of nanostructured indium phosphide. Therefore, questions of the conditions for the formation of semiconductor intrinsic oxides, their structure, and chemical composition, and also the effect of oxides on the physical and technical characteristics of materials are important. Originality/value: The patterns of oxide formation on the surface of indium phosphide during electrochemical etching are investigated in this work. It is shown for the first time that the structure of an oxide depends on the orientation of the surface of the semiconductor. It was shown that continuous oxide films are formed on the surface of p-InP, and oxide crystalline clusters are formed on the surface of n-InP.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 98, 2; 49-56
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Polyglycidyl-type Bonding Agents on the Viscoelastic Properties of a Carboxyl-terminated Poly(butadiene-co-acrylonitrilе)-based Composite Rocket Propellant
    Autorzy:
    Brzić, S.
    Dimić, M.
    Jelisavac, L.
    Djonlagić, J.
    Ušćumlić, G.
    Bogdanov, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358490.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    composite propellant
    carboxyl-terminated poly(butadiene-coacrylonitrilе)
    dynamic mechanical analysis
    viscoelastic properties
    Opis:
    In the present study, functionally substituted bonding agents (triglycidyl isocyanurate and diglycidyl dimethylhydantoin) were incorporated into a composite propellant formulation based on carboxyl-terminated poly(butadiene-co-acrylonitrilе) and ammonium perchlorate. Bonding agents are an important component of a composite propellant, making up to 0.5 wt.% of the formulation. They affect processing, mechanical properties, ballistics, ageing and the characteristics of insensitive munition (IM) propellants. All of the testing has been done using an unmetallized propellant formulation (80 wt.% bimodal ammonium perchlorate and 20 wt.% binder). The focus has been on the mechanical properties of the propellant, as influenced by the presence of these bonding agents. Mechanical uniaxial tensile tests were accompanied by a dynamic mechanical analysis (DMA) over a wide range of temperatures. The storage modulus, loss modulus, loss factor and glass transition temperature for each propellant sample have been evaluated. The network characteristics, such as sol-gel content and crosslink density have been calculated and successfully correlated with the mechanical properties. The dynamic mechanical studies showed that the content of the bonding agent did not influence the glass transition temperature; however, the loss factor was shown to be a function of the crosslink density.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 2; 307-321
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructured Materials for Optoelectronic Applications
    Autorzy:
    Kamanina, N.
    Vasilyev, P.
    Serov, S.
    Savinov, V.
    Bogdanov, K.
    Uskokovic, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537908.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.79.-e
    78.20.-e
    78.30.Na
    Opis:
    Study and optimization of new nanoscale materials useful for optoelectronic application have been considered. The search for the effective nanostructured materials has been revealed in two directions: to optimize the mechanical hardness of the inorganic systems and to increase the photorefractive parameters of the organics with nanoobjects. It has been testified that the surface mechanical properties of the inorganic materials via nanotubes treatment process can be drastically improved. For example, the surface mechanical hardness of the UV and IR range soft materials can be increased up to 3-10 times under the conditions of oriented nanotubes placement. It has been obtained that the nonlinear optical characteristics (nonlinear refraction $n_{2}$ and cubic nonlinearity $χ^{(3)}$) of the organics thin films sensitized with fullerenes or nanotubes can be increased up to 3-4 orders of magnitude in comparison with the same parameters for bulk materials traditionally used for nonlinear optics.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 786-790
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of atmospheric conditions on the migration of diesel fuel spilled in soil
    Autorzy:
    Vuruna, M.
    Veličković, Z.
    Perić, S.
    Bogdanov, J.
    Ivanković, N.
    Bučko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/204748.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diesel fuel
    spillage
    sand
    clay
    vertical migration
    Opis:
    The most common chemical’s spills in typical transportation accidents are those with petroleum products such as diesel fuel, the consequence of which is an extensive pollution of the soil. In order to plan properly fuel recovery from the soil, it is important to gain information about the soil depth which may be affected by pollutant and to predict the pollutant concentration in different soil layers. This study deals with the impact of basic atmospheric conditions, i.e. air temperature and humidity on the diesel fuel migration through the soil. The diesel fuel was spilled into columns (L = 30 cm; D = 4.6 cm) filled with sandy and clay soil samples, and its concentrations at various depths were measured after 11 days under various air temperature (20 and 40°C) and relative humidity (30–100%) conditions. The effects observed were explained by understanding physical processes, such as fuel evaporation, diffusion and adsorption on soil grains. The increase in temperature results in higher fuel evaporation loss and its faster vertical migration. The relative humidity effect is less pronounced but more complex, and it depends much on the soil type.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 1; 73-79
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal ranges determination of morphological parameters of nanopatterned semiconductors quality for solar cells
    Autorzy:
    Suchikova, Y. O.
    Bogdanov, I. T.
    Kovachov, S. S.
    Kamensky, D. V.
    Myroshnychenko, V. O.
    Panova, N. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818496.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    nanopattern
    solar cells
    morphological parameters
    quality
    nanowzór
    ogniwa słoneczne
    parametry morfologiczne
    jakość
    Opis:
    Purpose: The paper aims to determine the values of the main morphological characteristics of nanopatterns, which can be considered as the reference for use as surfaces of solar cells. Design/methodology/approach: The article uses an approach based on the definition of reference indicators of nanopatterns for solar cells by analysing the main parameters of solar cells and comparing them with the possible values of morphological parameters. Correlations of pore radius and visible wavelength, porosity and visible range, wavelength of de Broglie, nanopatterned layer thickness and charge carriers diffusion length, etc., are analysed. Compliance verification of morphological characteristics of nanopatterns with the specified criteria was performed on the example of porous silicon layers. Findings: The conducted research allowed to define the basic values of morphological parameters of porous nanopatterns, namely porousness, pore size (effective diameter), the thickness of the porous layer, and form factor. Reference ranges of morphological parameters of nanopatterns formed on the surface of semiconductors for applications in solar cells are established. Research limitations/implications: The article is devoted to the choice of optimal morphological characteristics of porous nanopatterns on the surface of semiconductors for solar cells. However, for solar cells, other types of nanopatterns can also be applied, for which it is also necessary to develop methods for selecting optimal parameters. Moreover, the prospect of research on this topic is to check the intrusion into a certain range of values of real nanopatterns formed on the surface of semiconductors. Practical implications: In the article the methodology allowing to choose optimal values of morphological parameters of nanopatterns for its application for solar cells is considered. Such studies are of great practical importance for the production of high-quality solar cells based on nanopatterned semiconductors. Originality/value: The article for the first time considers the choice of the nanopattern type and the ranges of morphological parameters in terms of quality assurance of the final product - the solar cell. It is determined that it is necessary to take into account such factors as porousness, pore size, thickness of the porous layer and roundness. A range of optimal values is selected for each of the indicators.
    Źródło:
    Archives of Materials Science and Engineering; 2020, 101, 1; 15--24
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional model for the synthesis of nanostructures of the given quality level
    Autorzy:
    Suchikova, Y.O.
    Kovachov, S.S.
    Shishkin, G.O.
    Pimenov, D.O.
    Lazarenko, A.S.
    Bondarenko, V.V.
    Bogdanov, I.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175807.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    functional model
    electrochemical etching
    quality level
    semiconductors
    nanostructures
    IDEF0 methodology
    model funkcjonalny
    trawienie elektrochemiczne
    poziom jakości
    półprzewodniki
    nanostruktury
    metodologia IDEF0
    Opis:
    Purpose: The aim of this paper is to develop a functional model for the synthesis of nanostructures of the given quality level, which will allow to effectively control the process of nanopatterning on the surface of semiconductors with tunable properties. Design/methodology/approach: The paper uses the IDEF0 methodology, which focuses on the functional design of the system under study and describes all the necessary processes with an accuracy sufficient for an unambiguous modelling of the system's activity. Based on this methodology, we have developed a functional model for the synthesis of nanostructures of the given quality level and tested its effectiveness through practice. Findings: The paper introduces a functional model for the synthesis of nanostructures on the surface of the given quality level semiconductors and identifies the main factors affecting the quality of nanostructures as well as the mechanisms for controlling the formation of porous layers with tunable properties. Using the example of etching single-crystal indium phosphide electrochemically in a hydrochloric acid solution, we demonstrate that the application of the suggested model provides a means of forming nanostructures with tunable properties, assessing the quality level of the nanostructures obtained and bringing the parameters in line with the reference indicators at a qualitatively new level. Research limitations/implications: Functional modelling using the IDEF0 methodology is widely used when process control is required. In this study it has been applied to control the synthesis of nanostructures of the given quality level on the surface of semiconductors. However, these studies require continuation, namely, the establishment of correlations between the technological and resource factors of synthesis and the acquired properties of nanostructures. Practical implications: This study has a significant practical effect. Firstly, it shows that functional modelling can reduce the time required to form large batches of the given quality level nanostructures. This has made it possible to substantiate the choice of the initial semiconductor parameters and nanostructure synthesis modes in industrial production from the theoretical and empirical perspective. Secondly, the presented methodology can be applied to control the synthesis of other nanostructures with desired properties and to reduce the expenses required when resources are depleted and the cost of raw materials is high. Originality/value: This paper is the first to apply the IDEF0 methodology to control the given quality nanostructure synthesis. This paper will be of value to engineers who are engaged in the synthesis of nanostructures, to researchers and scientists as well as to students studying nanotechnology.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 107, 2; 72--84
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical evaluation of the quality of nanostructures synthesized on the surface of indium phosphide
    Autorzy:
    Kovachov, S.S.
    Bogdanov, I.T.
    Pimenov, D.O.
    Bondarenko, V.V.
    Konovalenko, A.A.
    Skurska, M.M.
    Konovalenko, I.S.
    Suchikova, Y.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175768.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    semiconductors
    nanostructures
    chemical criterion
    indium phosphide
    quality indicators
    półprzewodniki
    nanostruktury
    kryterium chemiczne
    fosforek indu
    wskaźniki jakości
    Opis:
    Purpose: The article proposes a methodology for determining the chemical quality criterion of porous layers synthesized on the surface of semiconductors, based on taking into account the chemical parameters of the surface that can affect the properties of nanostructures. Design/methodology/approach: The chemical quality criterion was evaluated in terms of stoichiometry, stability of structures over time, uniformity of distribution over the surface, and the presence of an oxide phase. As an example, a calculation is demonstrated for the por-InP/InP structure synthesized on a mono-InP surface. The results of calculating the chemical quality criterion were evaluated using the Harrington scale to rank samples by quality level. Findings: A chemical criterion for the quality of porous layers synthesized on the surface of semiconductors has been developed. This criterion contains a set of indicators sufficient for a comprehensive assessment of the surface condition and is universal in nature. The studies carried out make it possible to reasonably approach the determination of the modes of electrochemical processing of semiconductors and open up new perspectives in the construction of a model of self-organization of a porous structure. Research limitations/implications: The chemical quality criterion does not allow evaluating the obtained nanostructures in terms of geometric parameters. Therefore, in the future, there is a need to develop a morphological quality criterion and determine a methodology for assessing a generalized quality criterion for nanostructures synthesized on the surface of semiconductors, which may include economic, environmental, technological indicators, and the like. Practical implications: Study results are expedient from a practical point of view, since they make it possible to reasonably approach the determination of the modes of electrochemical processing of semiconductors, synthesize nanostructures with predetermined properties, and create standard samples of nanomaterial composition. Originality/value: Methodology for assessing the quality of porous semiconductors by a chemical criterion has been applied for the first time in engineering science. The article will be useful to engineers, who are engaged in the synthesis of nanostructures, researchers and scientists, as well as specialists in nanometrology.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 110, 1; 18--26
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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