Autor: Schmidt, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Exchange Coupling of Magnetic Multilayers in Spin-Polarized Jellium
Autorzy:: Schmidt, W.
Powiązania:: https://bibliotekanauki.pl/articles/1955446.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.-r
75.70.-i
Opis:: The bilinear and biquadratic coupling between two metallic layers separated by a nonmagnetic metal spacer are studied. The paper contains analytical formulae for the coupling which are obtained from the energy potential of the spin-polarized electron gas. The formulae for the coupling are obtained in the framework of the Hohenberg-Kohn formalism of the density functional theory and variables of the coupling are the electron density and the spin polarization of the magnetic multilayer.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 265-268
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Exchange Stiffness Parameter and Magnetization in Pseudopotential Calculations
Autorzy:: Schmidt, W.
Powiązania:: https://bibliotekanauki.pl/articles/2013986.pdf
Data publikacji:: 2000-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.15.Mb
71.15.Hx
75.30.Et
Opis:: We study low temperature magnetic properties of transition metals. The ground state spontaneous magnetization is calculated in a pseudopotential approximation. In the calculations, the core electronic orbitals are approximated by asymptotic expressions. The magnetizations are calculated for uniform spin densities of valence (chemically active) electrons and in the Lindhard approximation. Our calculations of the Bloch wall parameter and the magnon stiffness constant are based on a study of ferromagnetic and paramagnetic phases. A simple Bragg-Williams approximation between energy of spin polarization and the time-average of the spin moment per atom determines the "exchange coupling" (Heisenberg-like) for spin-polarized nearest neighbour Wigner-Seitz cells. Ab initio numerical results of the spontaneous magnetization, the Bloch wall parameter, and the magnon stiffness constant are obtained for Fe, Co, and Ni.
Źródło:: Acta Physica Polonica A; 2000, 97, 5; 967-970
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: The Spin-Wave Stiffness within Density Functional Theory and the Ginzburg-Landau Functional
Autorzy:: Schmidt, W.
Powiązania:: https://bibliotekanauki.pl/articles/2014458.pdf
Data publikacji:: 2000-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Et
71.15.Mb
Opis:: The stiffness constant of the stationary spin excitation is calculated employing density functional theory and the phenomenological Ginzburg-Landau energy functional in a site form. The exchange parameter of the magnetic functional is estimated within the framework of the nearest neighbours intermolecular interaction and the energy gain of non-magnetic state per atom. The stiffness constant of Fe, Co, and Ni metals is found based on the energies of spin polarization calculated numerically in the local spin density approximation by Moruzzi et al. as well as by Kübler. The calculated stiffness constants are compared with other theoretical calculations and experimental data.
Źródło:: Acta Physica Polonica A; 2000, 98, 5; 625-628
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Existence in optimal control problems of certain Fredholm integral equations
Autorzy:: Roubicek, T.
Schmidt, W.
Powiązania:: https://bibliotekanauki.pl/articles/206876.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: ciało zorientowane
istnienie
miara Younga
relaksacja
równanie całkowe
sterowanie optymalne
existence
integral equation
optimal control
orientor field
relaxation
Young measures
Opis:: Existence of an optimal control for certain systems governed by nonlinear Fredholm integral equations that are of a Hammerstein type wlith respect to the control is proved under convexity of the orientor field by using a relaxed problem. Then, this convexity assumption is put away by finer analysis of the maximum principle. Illustrative examples are presented.
Źródło:: Control and Cybernetics; 2001, 30, 3; 303-322
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Low energy electrons in non-polar liquids
Autorzy:: Schmidt, W.
Illenberger, E.
Powiązania:: https://bibliotekanauki.pl/articles/148513.pdf
Data publikacji:: 2003
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: electrons
energetics
kinetics
non-polar liquids
lifetime
Opis:: The properties of excess electrons in non-polar liquids have been studied for more than 30 years. Here, pertinent results are reviewed and discussed with respect to the possibility of studying electron-molecule interactions with low energy electrons in the liquid phase. Some new results on the estimate of the electron lifetime in the delocalized state in liquid hydrogen are presented.
Źródło:: Nukleonika; 2003, 48, 2; 75-82
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: On-admission laboratory predictors for developing critical COVID-19 during hospitalization – a multivariable logistic regression model
Autorzy:: Schmidt, W.
Jóźwiak, B.
Czabajska, Z.
Pawlak-Buś, K.
Leszczynski, P.
Powiązania:: https://bibliotekanauki.pl/articles/28761827.pdf
Data publikacji:: 2022
Wydawca:: Instytut Medycyny Wsi
Źródło:: Annals of Agricultural and Environmental Medicine; 2022, 29, 2; 274-280
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki

Artykuł

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