Temat: 05.30.Fk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Luttinger Liquid as a New Metallic State of Correlated Fermions
Autorzy:: Byczuk, K.
Spałek, J.
Powiązania:: https://bibliotekanauki.pl/articles/1946461.pdf
Data publikacji:: 1996-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.30.Fk
Opis:: This article provides an elementary introduction to the physics of the Luttinger liquid and summarizes its basic properties, as well as discusses examples, where such quantum liquid would be or has been observed experimentally. A comparison with the Fermi-liquid state is made
Źródło:: Acta Physica Polonica A; 1996, 90, 4; 595-602
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Soluble Model of Interacting Bosons Trapped in Harmonic Potential: Quality of Bogoliubov Approximation
Autorzy:: Załuska-Kotur, M.
Gajda, M.
Mostowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2028887.pdf
Data publikacji:: 2001-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.75.Fi
05.30.Fk
Opis:: We study a system of trapped bosonic particles interacting by model harmonic forces. Our model allows for a detailed examination of the notion of an order parameter (a condensate wave function). By decomposing a single particle density matrix into coherent eigenmodes we study an effect of interaction on the condensate. We show that sufficiently strong interactions cause that the condensate disappears even if the whole system is in its lowest energy state. In the second part of our paper we discuss the validity of the Bogoliubov approximation by comparing its predictions with results inferred from the exactly soluble model. In particular we examine an energy spectrum, occupation, and fluctuations of the condensate. We conclude that Bogoliubov approach gives a quite accurate description of the system in the limit of weak interactions.
Źródło:: Acta Physica Polonica A; 2001, 100, 4; 485-504
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical Stability of Solution of Recursion Relation for Ideal Quantum Gases Containing Finite Number of Harmonically Trapped Particles
Autorzy:: Paszkiewicz, T.
Wolski, S.
Powiązania:: https://bibliotekanauki.pl/articles/1402575.pdf
Data publikacji:: 2015-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.30.Fk
03.75.Ss
Opis:: The numerical stability of the solution of recursion relation for mean occupation numbers derived by Schönhammer for ideal Fermi gas trapped in 1D harmonic potential is studied. In low temperature region there exists a solution of this recursion relation. In high temperature region the iteration becomes unstable. In low and high temperature regions with growing number of particles the region of numerical instability diminishes.
Źródło:: Acta Physica Polonica A; 2015, 128, 2; 204-207
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A New Microscopic Calculation for the Uniform Electron Fluid
Autorzy:: Bouchebak, A.
Al-Sugheir, M.
Ghassib, H.
Powiązania:: https://bibliotekanauki.pl/articles/1505328.pdf
Data publikacji:: 2011-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.30.Fk
71.10.Ay
71.10.Ca
Opis:: The static fluctuation approximation is applied for the first time to an electronic system. A simple model (a uniform electron fluid) is chosen to explore the applicability of static fluctuation approximation to electrons in metals. The thermodynamic properties - the internal energy per particle, the pressure, the entropy per unit volume, the heat capacity per unit volume, and the chemical potential - are calculated over a wide range of densities within the metallic-density region. Finally, the pair-correlation function for the electron fluid is evaluated. Values of this function are then tabulated for zero-interparticle separation at several densities of interest. The results of this work are found to be in good agreement with several other many-body calculations.
Źródło:: Acta Physica Polonica A; 2011, 119, 3; 312-322
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Magnetocaloric effect in Gd₂O₃@SiO₂ nanocomposite
Autorzy:: Zeleňáková, A.
Hrubovčák, P.
Berkutova, A.
Kapusta, O.
Zeleňák, V.
Powiązania:: https://bibliotekanauki.pl/articles/1054708.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Sg
81.05.Rm
75.20.Ck
75.75.Fk
Opis:: Nanocomposite consisting of Gd₂O₃ nanoparticles embedded in periodical porous silica matrix was investigated with respect to its magnetocaloric properties. Series of field (up to 5 T) dependence of magnetization data were recorded in temperature range 2-52 K. The data were subsequently processed employing Maxwell relation in order to calculate magnetic entropy change (Δ S_M) of the system. Examined nanocomposite exhibited reasonably high value of Δ S_M ≈ 29 J/(kg K) at maximal field change 5 T at the temperature of 2 K which suggests that this material could be feasible for cryomagnetic refrigeration applications.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 810-812
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports
Autorzy:: Poplavsky, V.
Dorozhko, A.
Luhin, V.
Matys, V.
Zukowski, P.
Czarnacka, K.
Powiązania:: https://bibliotekanauki.pl/articles/1033764.pdf
Data publikacji:: 2017-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.37.Hk
81.15.Jj
81.05.U-
82.45.Jn
82.80.Fk
82.80.Yc
88.20.ff
88.30.pd
88.30.pf
Opis:: Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells - perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U=10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.
Źródło:: Acta Physica Polonica A; 2017, 132, 2; 278-282
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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