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    Wyświetlanie 1-8 z 8
    Tytuł:
    Stability Analysis of FGM Layered Shells in the Surrounding Medium
    Autorzy:
    Sofiyev, A.
    Schnack, E.
    Deniz, A.
    Zerin, Z.
    Avcar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490962.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Bn
    62.20.mq
    Opis:
    In this study, the stability analysis of three-layered shells containing a functionally graded material layer in the surrounding medium and subjected to the uniform lateral pressure is investigated. The surrounding elastic medium is modeled as a Pasternak foundation. The dimensionless critical lateral pressures of three-layered functionally graded material shells with and without elastic foundations are obtained. Effects of compositional profiles and elastic foundation on the dimensionless critical lateral pressures have been studied.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 162-164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of the Non-Homogeneity and Elastic Medium on the Critical Torsional Load of the Orthotropic Cylindrical Shell footnotemark
    Autorzy:
    Sofiyev, A.
    Deniz, A.
    Avcar, M.
    Özyigit, P.
    Omurtag, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400146.pdf
    Data publikacji:
    2013-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Bn
    62.20.mq
    Opis:
    In this study, the torsional stability problem of non-homogeneous orthotropic composite cylindrical shells in the elastic medium, using the Galerkin method was investigated. The Winkler model is used to describe the reaction of the elastic medium on the cylindrical shell. Mixed boundary conditions are considered. The effects of variations of shell parameters, non-homogeneity, orthotropy and foundation stiffness on the critical torsional load are examined.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 4; 728-730
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability Analysis of Clamped Nonhomogeneous Shells on the Elastic Foundation
    Autorzy:
    Sofiyev, A.
    Deniz, A.
    Ozyigit, P.
    Pinarlik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182908.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Bn
    62.20.mq
    Opis:
    In the present study a theoretical analysis is presented for determining the stability characteristics of clamped non-homogeneous shells on the elastic foundation subjected to the lateral pressure. The basic equations have been derived for the shell, the Young modulus of which varies exponentially in the thickness direction and rests on the elastic foundation. By applying the Galerkin method to the basic equations, the expressions for the critical lateral pressure of the non-homogeneous shell with or without an elastic foundation are obtained. Finally, the effects of the non-homogeneity, elastic foundation and shell characteristics on the critical lateral pressure have been studied.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 459-461
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Buckling of Shear Deformable Functionally Graded Orthotropic Cylindrical Shells under a Lateral Pressure
    Autorzy:
    Sofiyev, A.
    Deniz, A.
    Mecitoglu, Z.
    Ozyigit, P.
    Pinarlik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193003.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Bn
    62.20.mq
    Opis:
    In this study, the buckling of functionally graded (FG) orthotropic cylindrical shells with shear deformation subjected to a lateral pressure is discussed. The stability and compatibility equations for FG orthotropic cylindrical shells on the basis of first order shear deformation theory (FOSDT) are derived. The expressions for non-dimensional critical lateral pressure on the basis of FOSDT and classical shell theory (CST) are obtained. The parametric studies are carried out to investigate the influences of shear deformation, orthotropy and heterogeneity on the non-dimensional critical lateral pressure.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 907-909
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Relationship Between Cement Quality and Separation Cut Size
    Zależność pomiędzy jakością cementu a ziarnem podziałowym
    Autorzy:
    Umucu, Y.
    Deniz, V.
    Sarac, M. F.
    Kuzgun, A. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/318141.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    produkcja
    cement
    jakość
    separacja
    wzbogacalnik powietrzny
    cement production
    cement quality
    separation
    cut size
    air separator
    Opis:
    Cement is prepared by firing a mixture of raw materials, one of which is mainly composed of calcium carbonate and the other of aluminium silicate. The most familiar materials answering to this description are limestone and clay, both of which occur in nature in a great number of varieties. Marls, which are a mixture of clay and shales, are also common raw materials for cement. The production of cement is an energy-intensive process. The typical energy consumption of a modern cement plant is about 90–120 kWh per ton of produced cement. The service properties of cement such as workability and strength development are affected not only by the chemical and mineralogical composition but also to a great extent by the fineness and particle size distribution of the cement produced; in practice often only the strength development of cement is of primary interest. Yet the effect on workability is just as important. Moreover, the surface area and granulometric parameters may also directly or indirectly affect the frost resistance and other durability-related properties of concrete. There are process engineering options for controlling fineness and particle size distribution of the cement by changing the mode of operation of the mill and the separator. This paper describes a study of the relationship between cement strength and separation cut size (d50). The separation cut size (d50) of air separator products obtained by different days was ascertained by using particle size analysis. It was found that the cement fineness and separation cut size (d50) are very effective on the strength of cement.
    Cement jest wylany z mieszanek surowców, zawierających węglan wapnia i glinokrzemiany. Najpowszechniejszymi surowcami są wapień i glina. Oba występują w naturze w dużych ilościach i wielu odmianach. Margle będące mieszaniną gliny i łupka ilastego, również są surowcem używanym do produkcji cementu. Proces produkcji cementu wymaga dużego nakładu energii. Standardowe zużycie energii w nowoczesnej fabryce wynosi około 90-120kWh na tonę wyprodukowanego cementu. Właściwości użytkowe cementu, takie jak urabialność czy wytrzymałość są zależne nie tylko od składu chemicznego i mineralogicznego, lecz również w dużej mierze od rozdrobnienia i rozkładu wielkości cząstek wyprodukowanego cementu; w praktyce często jedynie wytrzymałość cementu jest brana pod uwagę, jednakże, wpływ urabialności jest równie istotny. Ponadto, wielkość powierzchni i parametry granulometryczne mogą również bezpośrednio lub pośrednio wpływać na mrozoodporność i inne właściwości cementu związane z jego wytrzymałością. Istnieją sposoby metody sterowania rozdrobnieniem i rozkładem wielkości cząstek cementu za pomocą zmiany trybu pracy młyna i separatora. Praca opisuje badania nad związkiem między wytrzymałością cementu, a wielkością ziarna podziałowego (d50). Ziarno podziałowe (d50) produktów separatora powietrznego, uzyskane w różnych warunkach określono na podstawie analizy granulometrycznej.Wykazano, że uziarninie cementu oraz (d50) mają istotny wpływ na wytrzymałość cementu.
    Źródło:
    Inżynieria Mineralna; 2015, R. 16, nr 2, 2; 189-194
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of the Properties of Paper Sized with Styrene-Butyl Acrylate Copolymers
    Autorzy:
    Özdemir, M.
    Özdemir Alp, M.
    Aytaç, A.
    Deniz, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031427.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bm
    68.47.Mn
    81.05.Qk
    Opis:
    In this study, styrene 70 wt.%-butyl acrylate 30 wt.% copolymer-based surface-sizing materials were synthesized using semi-batch emulsion polymerization and applied on the paper. Four different emulsifiers, with different ethylene oxide numbers, at ratios of 10%, 7% and (2, 2'-azobis (2-methylpropionamidine) dihydrochloride (A)) as initiator were used for emulsion polymerization. Eight different copolymers were synthesized. Synthesized copolymers were used as surface sizing agents for the paper surface. Ion exchange capacity, pH, Fourier transform infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis were used for the characterization of the copolymer properties. Contact angle measurements, Cobb test, and scanning electron microscopy analysis were carried out to determine the surface properties of the paper samples. Presence of copolymer formations was proven with the Fourier transform infrared analysis. Contact angle measurements of the copolymer sized paper surface have shown hydrophobic behaviour in samples, with the exception of E-3/7/A sample. The lowest Cobb value was observed for E-2/7/A sample. The highest thermal stability was also observed for E-2/7/A sample. The scanning electron micrographs show that the paper loses its fibrous structure and it is seen that the copolymer adheres to the fibrous tissue.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1098-1101
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation into the surface properties of papers sized with styrene-acrylate-cationic monomer based terpolymers
    Autorzy:
    Özdemir, M.
    Aytaç, A.
    Deniz, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050997.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.47.Pe
    82.35.-x
    Opis:
    In this study, styrene(St)/2-ethyl hexyl acrylate(2-EHA) based surface sizing materials were developed with four different cationic monomers (CM), namely diallyldimethyl ammonium chloride (DADMAC), [2-(methacryloyloxy) ethyl] trimethylammonium chloride (MATMAC), [3-(methacryloylamino) propyl]-trimethyl ammonium chloride (MAPTAC), (viniylbenzyl) trimethyl-ammonium chloride (VBTMAC). Ternary polymerization was realized with emulsion polymerization, by using 2,2'-azobis (2-methylpropionamidine) dihydrochloride (A) as initiator. Thermal properties of the synthesized terpolymers were determined with differential scanning calorimeter and thermal gravimetric analysis. Differential scanning calorimeter results showed that glass transition temperature (T_{g}) values of polymers were not dependent on the types of cationic monomers, and were found about 44-45°C. Ion exchange capacities of the terpolymers were determined. The latexes produced were used as sizing materials for paper surface treatment. Then critical surface properties of the papers sized such as water resistance (Cobb value) and contact angle were measured. It was found that the best, i.e. the lowest Cobb results were obtained when MATMAC and MAPTAC cationic monomers were used in terpolymers.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 178-181
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical extension of a multi-storey reinforced concrete building
    Autorzy:
    Bahrami, A.
    Deniz, S.
    Moalin, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174183.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konstrukcja żelbetowa
    ugięcie
    budynek żelbetowy
    vertical extension
    reinforced concrete building
    utilisation ratio
    reaction force
    deflection
    Opis:
    The global population is increasing annually; thus, there is a need for more housing and buildings worldwide. As cities grow outward and buildable lands become scarce, it is necessary to increase the height of existing buildings in cities, especially where the height of the buildings is low. For crowded cities, the storey extension is an increasingly popular measure that can meet market demand for centrally located houses. This paper examines the possibility of the vertical extension of an existing (reference) reinforced concrete building in Gävle in Sweden. The StruSoft FEM-Design program is employed to carry out the research. The building is firstly modelled, analysed, and designed completely. Thereafter, a storey extension is conducted vertically. The stresses and utilisation ratios of the load-bearing elements of the reference and extended buildings are assessed. It is found that some of the load-bearing elements of the building after the extension need strengthening. Different practical strengthening solutions are proposed. It is concluded that the building can successfully withstand the vertical extension after applying these proposed solutions. The maximum vertical reaction forces of the reference and extended buildings are obtained and compared. A comparison of the deflections of the buildings is made. The structural stability of the buildings is evaluated as well.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 1--20
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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