The Experts below are selected from a list of 228438 Experts worldwide ranked by ideXlab platform
Constantinos Challoumis κωνσταντίνος χαλλουμής - One of the best experts on this subject based on the ideXlab platform.
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the flash of space time the flash of zero Analytical Form
2018Co-Authors: Constantinos Challoumis κωνσταντίνος χαλλουμήςAbstract:This paper analyzes the existence of space-time in the universe. This analysis has a central approach to the thing that space-time conduct as a rapid incident in the boundary approaches and as an infinity element in another point of view. These incidents of zero effect and infinity space-time effect are happening simultaneously. This work is used philosophical concepts, mathematical and functional analysis, and contemporaneously some physical elements.
Wodkiewicz K - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen atom in phase space. The Kirkwood-Rihaczek representation
2002Co-Authors: Praxmeyer L, Wodkiewicz KAbstract:We present a phase-space representation of the hydrogen atom using the Kirkwood-Rikaczek distribution function. This distribution allows us to obtain Analytical results, which is quite unique because an exact Analytical Form of the Wigner functions corresponding to the atom states is not known. We show how the Kirkwood-Rihaczek distribution reflects properties of the hydrogen atom wave functions in position and momentum representations
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Hydrogen atom in phase space. The Kirkwood-Rihaczek representation
2002Co-Authors: Praxmeyer L, Wodkiewicz KAbstract:We present a phase-space representation of the hydrogen atom using the Kirkwood-Rikaczek distribution function. This distribution allows us to obtain Analytical results, which is quite unique because an exact Analytical Form of the Wigner functions corresponding to the atom states is not known. We show how the Kirkwood-Rihaczek distribution reflects properties of the hydrogen atom wave functions in position and momentum representations.Comment: 5 pages (and 5 figures
A A Kleshchev - One of the best experts on this subject based on the ideXlab platform.
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some methods of solution of problems of sound diffraction on bodies of non Analytical Form
2016Co-Authors: A A KleshchevAbstract:This review analyzes following numerical methods of a solution of problems of a sound diffraction on ideal and elastic scatterers of a non-Analytical Form: a method of integral equations, a method of Green’s functions, a method of finite elements, a boundary elements method, a method of Kupradze, a T-matrix method and a method of a geometrical theory of a diffraction.
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method of integral equations in problem of sound diffraction on bodies of non Analytical Form
2012Co-Authors: A A KleshchevAbstract:The real scatterers have non – Analytical Form and therefore the method of the division of the variables does not approach by the calculation of the reflection from their. In the article is presented the method of the integral equations Fredholm of the first and second kinds for the solution of the problem of the sound diffraction on the ideal non – Analytical scatterers. In detail is giving the analysis of the improper integrals and are calculating the moduluses of the moduluses of the scattered pressure for the non – Analytical bodies.
Marcin Kujawa - One of the best experts on this subject based on the ideXlab platform.
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distortional buckling of thin walled columns of closed quadratic cross section
2017Co-Authors: Czeslaw Szymczak, Marcin KujawaAbstract:The elastic stability of axially compressed column related to the cross-section distortion is investigated. Two kinds of closed quadratic cross-sections are taken into consideration with internal walls and without it. The governing differential equation is derived with aid of the principle of stationary total potential energy. The critical loads for the simply supported columns are found in an Analytical Form and compared with the FEM solution. Sufficient accuracy of the results is worth of noticing.
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elastic distortional buckling of thin walled bars of closed quadratic cross section
2013Co-Authors: Marcin Kujawa, Czeslaw SzymczakAbstract:In this study a thin-walled bar with closed quadratic cross-section is considered. The elastic stability of axially compressed bar related to the cross-section distortion is investigated. The governing differential equation is derived with aid of the principle of stationary total potential energy. The critical load for the simply supported bar is found in Analytical Form and it is compared with the FEM solution. Sufficient accuracy of the results is worth of noticing.
Czeslaw Szymczak - One of the best experts on this subject based on the ideXlab platform.
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distortional buckling of thin walled columns of closed quadratic cross section
2017Co-Authors: Czeslaw Szymczak, Marcin KujawaAbstract:The elastic stability of axially compressed column related to the cross-section distortion is investigated. Two kinds of closed quadratic cross-sections are taken into consideration with internal walls and without it. The governing differential equation is derived with aid of the principle of stationary total potential energy. The critical loads for the simply supported columns are found in an Analytical Form and compared with the FEM solution. Sufficient accuracy of the results is worth of noticing.
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elastic distortional buckling of thin walled bars of closed quadratic cross section
2013Co-Authors: Marcin Kujawa, Czeslaw SzymczakAbstract:In this study a thin-walled bar with closed quadratic cross-section is considered. The elastic stability of axially compressed bar related to the cross-section distortion is investigated. The governing differential equation is derived with aid of the principle of stationary total potential energy. The critical load for the simply supported bar is found in Analytical Form and it is compared with the FEM solution. Sufficient accuracy of the results is worth of noticing.
