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Wyszukujesz frazę "Pavlík, M." wg kryterium: Autor


Wyświetlanie 1-9 z 9
Tytuł:
Influence of Electromagnetic Shield on the High Frequency Electromagnetic Field Penetration through the Building Material
Autorzy:
Kolcunová, I.
Pavlík, M.
Beňa, L'.
Čonka, Z.
Ilenin, S.
Kanálik, M.
Kolcun, M.
Mészáros, A.
Medveď, D.
Zbojovský, J.
Powiązania:
https://bibliotekanauki.pl/articles/1032736.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.Gz
Opis:
This paper studies how to protect people against electromagnetic radiation inside a building. Widespread usage of the mobile communication led to building of more and more new GSM base-station antennas. These antennas are often placed in the areas with high population density. These antennas emit electromagnetic radiation in standard mobile operator frequencies, i.e. 0.9, 1.8 and 2.1 GHz. Many studies have shown potential biological and thermal effects of GSM electromagnetic fields, therefore people are concerned about their health. Electromagnetic wave does not penetrate the wall of the building as a whole. A small part of the wave is reflected and a small part is absorbed by the building material. In this paper the penetration of electromagnetic waves through the commercially available building materials is measured with specific focus on frequencies of 0.9, 1.8, and 2.1 GHz. Next, the surface of the chosen building material was coated with a magnetic conductive paint in order to improve the shielding effect of the building material. The results of experiment show how the electromagnetic shield reduces the penetration of electromagnetic waves through the building wall.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1135-1137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additional Modification of Thermomagnetic Properties of Objects of Low Relative Permeability in Electromagnetic Field
Autorzy:
Medveď, D.
Zbojovský, J.
Pavlík, M.
Ilenin, S.
Čonka, Zs.
Kanálik, M.
Kolcunová, I.
Mészáros, A.
Beňa, L.
Kolcun, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032188.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.05.+e
Opis:
This paper presents the characteristics of the foodstuff heating phenomenon using induction heating process by an induction cooker. The simulation setup was prepared according to the proposed magnetic material and configuration of the pot and induction cooker. The material properties of pot were varied among the several alternatives. The helical coil was designed on the base of the limitation of the induction cooker size and given number of coil turns and coil tube diameter with specific supplied electric current density. The data from the simulation analysis have to determine the enhancing of the highest heat transfer from induction cooker into pot. These data led to the modification of the material and geometrical properties of the pot in accordance to a minimum heating time and enhanced safety operation, especially close to unshielded magnetic objects.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1138-1140
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic Properties of Geometrically Frustrated S=1/2 XY Antiferromagnet $Er_{2}Sn_{2}O_{7}$
Autorzy:
Al Ghamdi, N.
Orendáčová, A.
Pavlík, V.
Orendáč, M.
Powiązania:
https://bibliotekanauki.pl/articles/1368676.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
75.50.Ee
75.30.Sg
Opis:
The magnetic susceptibility, specific heat and entropy of geometrically frustrated S=1/2 XY antiferromagnet $Er_{2}Sn_{2}O_{7}$ are reported. It is shown, that temperature dependence of magnetic susceptibility above nominally 10 K is governed by crystal field effects. Systematic study of specific heat in magnetic fields up to 7 T enabled the estimation of exchange coupling, J/k<<4.6 K. Investigation of isothermal change of magnetic entropy upon magnetization from 1 T to 7 T revealed the absence of enhanced magnetocaloric effect. The obtained results suggest that frustration parameter f ≈140 proposed for $Er_{2}Sn_{2}O_{7}$ earlier may be significantly overestimated.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 264-265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Treatment on the Structure and Magnetic Properties of Fe-Al-Cu-Nb-Si-B Alloys
Autorzy:
Pavlík, G.
Matta, P.
Sovák, P.
Zorkovská, A.
Konč, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013354.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Bg
75.50.Kj
75.80.+q
81.40.Rs
Opis:
In this paper we present experimental results on influence of Al content on the structure and saturation magnetostriction of Fe-Al-Cu-Nb-Si-B alloys after heat treatment. Transmission electron microscopy observations confirmed the existence of nanocrystalline structure after annealing at 490°C and 550°C for all samples. The crystallization temperature of FeSi phase and the temperature at which the polycrystalline transformation starts were determined from temperature dependence of electrical resistivity. Aluminium slightly decreases the first crystallization temperature and considerably decreases the saturation magnetostriction in as-quenched state.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 741-744
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Analysis and Transport Properties of $RuO_2$-Based Thick Film Resistors
Autorzy:
Gabáni, S.
Flachbart, K.
Pavlík, V.
Pietriková, A.
Gabániová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813961.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.40.Xx
72.80.-r
73.40.Rw
Opis:
$RuO_2$-based low temperature sensors appear as very good secondary thermometers, mainly in the temperature range below 4.2 K. This is due to their high temperature sensitivity and small magnetoresistance. Both properties are strongly influenced by the manufacturing process (mainly by firing temperature and firing time). In our contribution we show that the microstructure of sensors and the temperature dependence of their resistance R(T) down to 50 mK, in case when all sensors are prepared from the same paste, can be strongly influenced by change of the firing temperature from 800°C to 900°C. The paper also presents results on the X-ray microanalysis and the analysis of electrical conductivity of these sensors.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 625-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of the Magnetocaloric Effect in the Two-Dimensional Quantum System $Cu(tn)Cl_2$
Autorzy:
Baranová, L.
Tarasenko, R.
Orendáčová, A.
Orendáč, M.
Pavlík, V.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368656.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.30.Sg
Opis:
Magnetocaloric studies of a two-dimensional antiferromagnet $Cu(tn)Cl_{2}$ (tn=1,3-diaminopropane=$C_3H_{10}N_2)$ have been performed by adiabatic magnetization and demagnetization measurements, in the temperature range from 0.2 to 4 K and magnetic fields up to 2 T. The compound represents an S=1/2 spatially anisotropic triangular-lattice antiferromagnet. The magnetocaloric measurements were focused at the identification of the phase transition to the magnetically ordered state which was not indicated in the previous specific heat studies. Furthermore, the interplay of the magnetic-field induced easy-plane anisotropy and the intrinsic spin anisotropy present in the studied system should manifest in low magnetic fields. The obtained results of the magnetocaloric experiments of $Cu(tn)Cl_{2}$ indicate a double crossover from the normal to inverse magnetocaloric effect (MCE). The first crossover from the normal to inverse MCE occurring at about 0.3 K can be attributed to the competition of the aforementioned anisotropies. The second crossover from the inverse to normal MCE observed at about 2.2 K might be ascribed to the formation of spin vortices stabilized by the easy-plane anisotropy introduced by magnetic field.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 256-257
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Structure and Magnetic Characteristics of FINEMET Alloys Substituted by Vanadium
Autorzy:
Brzózka, K.
Szumiata, T.
Gawroński, M.
Górka, B.
Sovák, P.
Pavlík, G.
Kolesár, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813522.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
76.80.+y
Opis:
Amorphous and nanocrystalline FINEMET-type alloys with vanadium addition up to 7 at% were investigated by the MÖssbauer spectroscopy and magnetic methods. The outcomes evidence alterations in grain structure, although the main effect is related to the changes in intergranular phase. This induces diminution of mean hyperfine field, saturation induction and Curie temperature as well as the increase in coercivity.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 51-54
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Rare-earth Based Single-ion Magnet $CsNd(MoO_{4})_{2}$
Autorzy:
Tkáč, V.
Tibenská, K.
Orendáčová, A.
Orendáč, M.
Anders, A.
Pavlík, V.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368610.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.-s
75.60.-d
Opis:
Specific heat, magnetization and DC susceptibility of the single crystal $CsNd(MoO_{4})_{2}$,a layered rare-earth dimolybdate, have been investigated nominally, in the temperature range from 100 mK to 300 K in the magnetic field up to 5 T, applied along the a axis. The analysis of the experimental data revealed the absence of a phase transition to the magnetic ordered state down to 100 mK. The application of a standard two-level model yielded an excellent agreement with the specific heat data above 2 K in nonzero magnetic field indicating a weakness of magnetic correlations and a predominant occupation of the ground-energy doublet. The latter indicates a large energy separation between the ground and first excited doublet. These measurements suggest that $CsNd(MoO_{4})_{2}$ can represent a good realization of a single-ion magnet.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 244-245
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron and EPR Study of $Cu(tn)Cl_{2}$ - a Two-Dimensional Spatially Anisotropic Triangular-Lattice Antiferromagnet
Autorzy:
Tarasenko, R.
Orendáčová, A.
Čižmár, E.
Maťaš, S.
Orendáč, M.
Zeleňák, V.
Pavlík, V.
Siemensmeyer, K.
Zvyagin, S.
Wosnitza, J.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368516.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Ee
Opis:
We have studied the temperature dependence of the lattice parameters and the influence of spin anisotropy on the electron paramagnetic spectra of $Cu(tn)Cl_2$, an S=1/2 quasi-two-dimensional spatially-anisotropic triangular-lattice Heisenberg antiferromagnet. The variation of the resonance fields with temperature reflects the presence of an easy-plane exchange anisotropy with $J_{z}$/$J_{x,y}$<1 and g-factor anisotropy, $g_{z}$/$g_{x,y}$>1.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 232-233
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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