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Wyświetlanie 1-8 z 8
Tytuł:
Mathematical Modeling of Heat Effect on Cable Insulation
Autorzy:
Eroglu, E.
Guney, I.
Gunes, I.
Sener, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031951.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.90.+p
88.20.td
Opis:
In the electric power industry, the cost of energy, its longevity and safety of transferring are important problems. Security problems, environmental effects, discharging occurrences and the endurance of the transporters are the problems that exist as a consequence of the high voltage necessity for the transmission of big amounts of energy and which need to be solved. ADSS (all dielectric self-supporting) cables are generally installed on high voltage transmission lines. They are mostly used in such situations, as high temperature, strong winds and direct sunshine and, as the effect, the UV radiation, etc. The solid materials are in use more frequently than gas or liquid ones. Decent dielectric materials need to be sturdy to puncturing and highly invulnerable for mechanical issues. Moreover, they have to perform and resist well the chemical reactions and high temperature, so that they would not be easily effected by the environmental factors. In this study, the mathematical modeling of heat effects on ADSS cables is investigated by using dry band arcing (IEEE 1222 Electrical surface degradation) test method. A heat source is introduced into the test setup, to evaluate the performance of poly-ethylene cable jackets on ADSS cables at different temperatures. Test results indicate that the endurance of the ADSS cables decreases with the increasing temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 539-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Single-Particle Kinetic Energy Density Functional in Hyper-spherical Reprezentation
Autorzy:
Kozlowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1887502.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.90.+p
31.20.Sy
Opis:
The properties of hyperspherical representation where the one-body orbitals are expressed in terms of the square root of the electron density, ρ(r) and the angle functions {θ$\text{}_{i}$(r)}$\text{}_{i=1,...,N-1}$, (R.F. Nalewajski, P.M. Kozlowski, Acta Phys. Pol. A74, 287 (1988)) are discussed, and the expression for the kinetic energy density functional is analyzed. This expression contains the Weizsäcker term plus a correction determined by the angle functions. Taking into account both the limit of only one occupied level and the slowly varying electron density with large N, it is shown that the kinetic energy density functional interpolates correctly between the known results. Finally, an example of a linear harmonic oscillator is given and the relation between the usual orbital pictures is discussed.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 655-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation of Two Coupled Scalar Fields with Cosmological Solution
Autorzy:
Sadeghi, J.
Amani, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813494.pdf
Data publikacji:
2008-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
04.60.-m
02.90.+p
02.30.Jr
Opis:
We study the first-order formalism for the two coupled scalar fields with the superpotential W(φ,χ). As we know, the cosmological solution crucially depends on the coupled scalar fields. Here, we deform the corresponding superpotential and obtain the solution for some cosmological parameters. Finally, we compare the deformed and non-deformed solutions with the different figures.
Źródło:
Acta Physica Polonica A; 2008, 113, 2; 677-689
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupled Nonlinear System in (2+1) Dimension and Overturning Solitons
Autorzy:
Ghosh, C.
Chowdhury, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/1945350.pdf
Data publikacji:
1996-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.90.+p
52.35.Nx
52.35.Sb
Opis:
Coupled nonlinear integrable systems in (2+1) dimension are generated from a matrix Schrodinger-type inverse problem and solved explicitly to demonstrate a new phenomenon of overturning. Both, the two- and three-dimensional graphical depictions of the solution are presented. Our analysis is an extension of the uncoupled case reported earlier by Bogoyavlenskii. A unique feature of the solution is the occurrence of arbitrary functions of (y, t) in its functional form, which significantly changes the behaviour of the solution.
Źródło:
Acta Physica Polonica A; 1996, 89, 4; 459-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the Lattice Green Function for the Anisotropic Face Centered Cubic Lattice
Autorzy:
Asad, J.
Hijjawi, R.
Hasan, Eyad
Diab, A.
Khalifeh, J.
Powiązania:
https://bibliotekanauki.pl/articles/1191217.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
05.50.+q
04.60.Nc
63.90.+t
02.90.+p
Opis:
An expression for the Green function of anisotropic face centered cubic lattice is evaluated analytically and numerically for a single impurity problem. The density of states, phase shift and scattering cross-section are expressed in terms of complete elliptic integrals of the first kind.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 52-58
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Shifter Operation of the Azimuthally Magnetized Coaxial Ferrite Waveguide
Autorzy:
Georgieva-Grosse, M.
Georgiev, G.
Powiązania:
https://bibliotekanauki.pl/articles/1419702.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Lj
02.90.+p
41.20.-q
41.20.Jb
85.70.Ge
Opis:
The terms for operation of the coaxial waveguide, entirely filled with azimuthally magnetized latching ferrite, as a digital nonreciprocal phase shifter for the normal $TE_{01}$ mode, are found. They are classified as physical, mathematical and functional ones. The physical prerequisites are drawn from the phase curves of the structure and specify the boundaries of the interval in which it produces differential phase shift for a given numerical equivalent of the modulus of off-diagonal ferrite permeability tensor element. The mathematical condition brings the parameters of configuration together with certain roots of its characteristic equation, derived in terms of complex Kummer and Tricomi confluent hypergeometric functions and with the related to them positive real $L_2(c,ρ,n)$ numbers (c=3, 0<ρ<1, n=1). The functional criteria determine the borders of the domain of phase shifter operation of the geometry. These are functions, defined for a fixed central conductor thickness which express in normalized form the impact of the guide radius on the phase shift at the cut-off frequencies and at the envelopes, denoting the termination of the phase curves for negative ferrite magnetization from the side of higher frequencies. The same are reckoned, employing iterative methods, consisting in a repeated numerical solution of the equation mentioned, followed by a computation of the guide radius and phase constant of the wave and are plotted graphically. The influence of the parameters of transmission line on the area referred to is analyzed.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 63-70
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbed Infinite 3D Simple Cubic Network of Identical Capacitors
Autorzy:
Asad, J.
Diab, A.
Owaidat, M.
Khalifeh, J.
Powiązania:
https://bibliotekanauki.pl/articles/1205363.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
84.37.+q
05.50.+q
04.60.Nc
63.90.+t
84.30.Bv
02.90.+p
Opis:
The effective capacitance between the origin and any other lattice site, in an infinite 3D simple cubic network consisting of identical capacitors, is evaluated in terms of the lattice Green function of the network. The perfect case is reviewed shortly, while the perturbed case (a capacitor is removed) is studied in two cases. Numerical values of the effective capacitance are presented and the asymptotic behavior is studied for the both cases.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 777-781
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infinite Body Centered Cubic Network of Identical Resistors
Autorzy:
Asad, Jihad
Diab, A.
Owaidat, M.
Hijjawi, R.
Khalifeh, J.
Powiązania:
https://bibliotekanauki.pl/articles/1206306.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
61.50.+f
61.66.f
84.37.+q
05.50.+q
04.60.Nc
63.90.+t
84.30.Bv
02.90.+p
Opis:
We express the equivalent resistance between the origin (0,0,0) and any other lattice site ($n_1$,$n_2$,$n_3$) in an infinite body centered cubic network consisting of identical resistors each of resistance R rationally in terms of known values $b_{0}$ and π. The equivalent resistance is then calculated. For large separations two asymptotic formulae for the resistance are presented and some numerical results with analysis are given.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 60-64
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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