Temat: 61.43.Bn - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Non-Linear Stability of Conical Shell Structures Including a Functionally Graded Core
Autorzy:: Sofiyev, A.
Ay, Z.
Najafov, A.
Mammadov, Z.
Schnack, E.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1195011.pdf Link otwiera się w nowym oknie
Opis:: In this study, the non-linear stability of three-layered conical shells with functionally graded core have not been investigated previously. The purpose of this paper is to study this problem. The large deflection theory with von Karman-Donnell-type of kinematic non-linearity is used to deduce the basic equations. The basic equations are solved analytically by using superposition and Galerkin methods. The influences of several parameters on the dimensionless non-linear critical axial loads are discussed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Structure Refinement of Amorphous Cd-As by Analysis of Partial Radial Distribution Functions
Autorzy:: Burian, A.
Tematy:: 61.43.Dq
61.43.Bn
61.43.-j; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1964102.pdf Link otwiera się w nowym oknie
Opis:: The anomalous wide angle X-ray scattering technique was used to determine the partial structure factors and then the partial radial distribution functions for vacuum evaporated Cd-As amorphous films containing 41 and 74% at. As. The experiments were performed using synchrotron radiation tuned near the As and Cd absorption edges. The obtained structural information about the individual Cd-Cd, Cd-As and As-As correlations shows that As and Cd remain almost tetrahedrally coordinated and suggest a certain degree of chemical disorder of the investigated samples.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Analysis of Chemical Disorder in $Pb_{1-x}Ge_{x}Te$
Autorzy:: Radzyński, T.
Łusakowski, A.
Tematy:: 31.15.A-
61.43.-j
61.43.Bn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811977.pdf Link otwiera się w nowym oknie
Opis:: The PbGeTe crystal lattice is locally deformed due to different ionic radii of cations and their random placement in the lattice. It is important to quantitatively characterize such microscopic disorder because local deformations have significant influence on the properties of magnetic ions introduced to such crystal. The simples method to study microscopic disorder is to consider purely classical model of the lattice in which neighboring atoms are connected by springs with properly chosen spring constant and equilibrium lengths. In the present work, using ab initio methods we discuss applicability of the springs-atoms model to the real crystal. We also explain results of extended X-ray absorption fine structure experiments performed on PbGeTe mixed crystals.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Modelling of Intrinsic Defects in CaYAl₃O₇
Autorzy:: da C. Bispo, G.
Jackson, R.
Valerio, M.
Tematy:: 61.43.Bn
61.72.-y
34.20.Cf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1029677.pdf Link otwiera się w nowym oknie
Opis:: CaYAl₃O₇ presents a challenge for computer modelling techniques because of its site-occupancy disorder related to the Ca/Y shared site. Supercells were built to reproduce experimental results which have the best agreement and lowest lattice energy. The potential parameters were obtained by empirical fitting, and reproduced the structure to within 1.09%. Results obtained by supercell and the Mott-Littleton methods were compared. Both methods predict oxygen Frenkel defects are likely to be formed.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

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.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1193003.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Nonlinear Behavior of Composite Truncated Conical Shells Subjected to the Dynamic Loading
Autorzy:: Najafov, A.
Kadioglu, F.
Mammadov, Z.
Zerin, Z.
Sofiyev, A.
Tekin, G.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1193209.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the non-linear (NL) behavior of composite truncated conical shells subjected to dynamic loading is studied. The basic equations are derived using the von Karman-Donnell-type of kinematic nonlinearity. These equations are reduced to a NL differential equation with the variable coefficient using the superposition principle and Galerkin method. The resulting equation is solved numerically using Runge-Kutta method and modified Budiansky-Roth criterion and the values of dimensionless NL critical time parameters are obtained. Finally, the effects of axial loading speed and orthotropy on the dimensionless NL critical time parameters of composite truncated conical shells are investigated.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: RKKY Interactions and Low-Temperature Behaviour of Spins in Quasiperiodic Tilings
Autorzy:: Thiem, S.
Tematy:: 75.50.Kj
61.43.Bn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1203442.pdf Link otwiera się w nowym oknie
Opis:: We study the structure of the Ruderman-Kittel-Kasuya-Yosida interactions for selected quasiperiodic tilings. The interaction energies between the magnetic impurities in these systems are computed by a continued fraction expansion for the Green function of the conduction electrons. Based on these results we study the alignment of the magnetic moments in the Ammann-Beenker tiling by Monte Carlo simulations. In particular, we are interested in the structure of the magnetic ground state and the low-temperature behaviour for the Ising model.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: Stability Analysis of Clamped Nonhomogeneous Shells on the Elastic Foundation
Autorzy:: Sofiyev, A.
Deniz, A.
Ozyigit, P.
Pinarlik, M.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1182908.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

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.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400146.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: On the Buckling of the Layered Cylindrical Shell with FGM Face Sheets Subjected to the Axial Load footnotemark
Autorzy:: Schnack, E.
Sofiyev, A.
Zerin, Z.
Tematy:: 61.43.Bn
62.20.mq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1400148.pdf Link otwiera się w nowym oknie
Opis:: In this study, the buckling analysis of layered cylindrical shells with functionally graded material face sheets subjected to an axial compressive load is investigated. The dimensionless axial buckling load of layered cylindrical shells with functionally graded material face sheets is obtained. Effects of volume fractions of functionally graded material face sheets and cylindrical shell characteristics on the dimensionless axial buckling load have been studied.
Dostawca treści:: Biblioteka Nauki

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