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    Wyświetlanie 1-9 z 9
    Tytuł:
    Copper and Zinc Concentrations in Soil, Pasture Sward and Blood Plasma of Beef Cattle
    Stężenie miedzi i cynku w glebie, murawie pastwiska oraz w osoczu krwi bydlęcej
    Autorzy:
    Pavlik, A.
    Skarpa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/387912.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    bydło
    żelazo
    miedź
    cynk
    gleba
    pastwiska
    osocze krwi
    beef cattle
    iron
    copper
    zinc
    soil
    pasture
    blood plasma
    Opis:
    The objective of this study was to compare concentrations of copper and zinc in soil, pasture sward and blood plasma of extensive reared Aberdeen Angus bulls and heifers on a farm in the foothills of the Orlicke Mountains. We sampled soil, pasture sward from pasture areas and blood from 22 bulls and 22 heifers in the period from birth to weaning at regular intervals (81, 151, 189 and 273 days of age). Concentrations of copper and zinc were analysed. Significant relationships (p < 0.05) was noted between soil and pasture copper concentrations (r = 0.74), pasture and blood plasma copper concentration (r = 0.29). No other significant correlation between monitored parameters was found. The indicators determined in this study can be used to specify the health and nutritional status of animals reared in the extensive suckling cows systems more detailed.
    Celem pracy było porównanie stężenia miedzi i cynku w glebie, runi pastwiskowej oraz osoczu krwi buhajów i jałówek rasy Aberdeen Angus, hodowanych w gospodarstwie u podnóża Gór Orlickich. Badano glebę, murawę pastwisk oraz krew 22 byków i 22 jałówek w okresie od urodzenia do odsadzenia w regularnych odstępach czasu (81, 151, 189 i 273 dni życia). W pobranych próbkach oznaczono stężenie miedzi i cynku. Istotne korelacje (p < 0,05) zaobserwowano pomiędzy stężeniem miedzi w glebie i w paszy (r = 0,74) oraz w paszy i w osoczu krwi (r = 0,29). Nie stwierdzono żadnych innych istotnych korelacji pomiędzy monitorowanymi parametrami. Parametry określone w tym opracowaniu mogą być używane do bardziej szczegółowego określenia stanu zdrowia i odżywienia zwierząt hodowanych.
    Źródło:
    Ecological Chemistry and Engineering. A; 2012, 19, 4-5; 495-498
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. 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:
    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:
    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:
    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
    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
      Wyświetlanie 1-9 z 9

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