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Wyświetlanie 1-15 z 17
Tytuł:
Capacitive Coupling And Parasitic Capacitances of Converters - EMC
Autorzy:
Kováčová, I.
Kováč, D.
Powiązania:
https://bibliotekanauki.pl/articles/262570.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electromagnetic compatibility
converter
PSpice simulation
parasitic capacitances
capasitive coupling
Opis:
The paper [25] is dealing with some electromagnetic compatibility (EMC) problems of converters and inverters, which are utilized for feeding of electric machines and its analyzing by PSPICE program. The main attention is focused on implications of parasitic capacitance and capacitive coupling existence.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 89-96
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic coupling of the electrical drive – EMC. Part II
Autorzy:
Kováč, D.
Kováčová, I.
Powiązania:
https://bibliotekanauki.pl/articles/262681.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electrical electromagnetic compatibility
electromagnetic coupling
electrical systems
electrical drives
Opis:
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC ) problem — the electromagnetic coupling applied in the field of power electrical systems as. The simulation analyses and practical measurements of the electromagnetic coupling are presented in part II . Obtained results confirm the correctness of the theoretical analyses and so they can be used for predictive stating of EMC quality of individual new electrotechnical products.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 89-94
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic coupling of the electrical drive - EMC. Part I
Autorzy:
Kováčová, I.
Kováč, D.
Powiązania:
https://bibliotekanauki.pl/articles/262596.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electrical electromagnetic compatibility
EMC
electromagnetic coupling
electrical systems
electrical drives
Opis:
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC) problem - the electromagnetic coupling applied in the field of power electrical systems. Theoretical analysis of above mentioned problem, based on the impact investigation of the electromagnetic wave propagation, is described in part I. Obtained results can be used for predictive stating of EMC quality of individual new electrotechnical products.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 9-15
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of DC permanent magnet disc motor and improving its EMC
Autorzy:
Kovacova, I.
Kanuch, J.
Kovac, D.
Powiązania:
https://bibliotekanauki.pl/articles/262741.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electromagnetic compatibility
disc motor
electromagnetic field radiation
Opis:
The paper deals with construction design of DC permanent magnet disc motor by classical calculation method and its verifying by computer finite element simulation method. The paper deals also with the computer analysis of the electromagnetic compatibility (EMC) problems focused to the area of electrical machines, which can also disclose the startling facts concerning. A problem of interference between electric motor and surroundings space caused by electromagnetic field radiation is discussed too.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 23-39
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inductive Coupling of the Electrical Systems
Autorzy:
Kovac, D.
Kovacova, I.
Tomcikova, I.
Powiązania:
https://bibliotekanauki.pl/articles/262765.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
electromagnetic compatibility
power electronics
electrical systems
Opis:
This papers deals with the computer analysis of the inductive coupling of the electromagnetic compatibility (EMC) problem focused at the area of power electronics and electrical drives and tests performed by the numerical computer simulatian, which can also disclose the startling facts concerning the electromagnetic compatibility (EMC) problems.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 1; 19-23
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clean bulk YBaCuO superconductors doped by paramagnetic ions of Sm and Yb
Autorzy:
Jirsa, M.
Volochová, D.
Kováč, J.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1054700.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Op
74.25.Sv
74.60.Ge
74.72.-h
Opis:
The recently developed clean cuprate technology was employed to study the effect of tiny amounts of paramagnetic Yb and Sm ions on electromagnetic properties of bulk YBaCuO. Small samples of about 1.5×1.5×0.5 mm³ were measured by vibrating sample magnetometer in the field range ±9 T and temperatures 30 K to 10 K in the non-superconducting tetragonal state and 300 K to 70 K in the orthorhombic, superconducting state. In the latter case, we observed the reversible paramagnetic moment above T_{C}, similar as in the tetragonal state. Below T_{C} an irreversible magnetic moment was observed from which critical current density, J_c, was evaluated using the extended Bean model. The effect of doping by Yb and Sm ions on J_c was studied and a correlation between J_c and the total paramagnetic moment was found. Both J_c(B) and the normalized pinning force density as a function of the reduced magnetic field were analyzed in terms of the classical model and discussed with respect to the material anisotropy, giving us at least a rough idea on the type of the effective pinning type and mechanism.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1027-1029
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Room-Temperature Ferromagnetism in Zn-Mn-O, X-Ray Photoemission Surface Study
Autorzy:
Milivojević, D.
Babić-Stojić, B.
Blanuša, J.
Kovač, J.
Powiązania:
https://bibliotekanauki.pl/articles/1503685.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
81.40.Rs
81.70.Jb
82.80.Pv
Opis:
Room temperature ferromagnetic properties of Zn-Mn-O show evident dependence on manganese concentration and preparation conditions. We systematically studied series of samples with manganese concentration ranging from 0 to 10 at.%, prepared in air at thermal treatment temperatures ranging from 400 to 900°C. The samples were investigated by X-ray diffraction, TEM, magnetization measurements and XPS spectroscopy. XPS analyses of surface composition, chemical bonding and XPS depth profiling were successfully employed on powder revealing the chemical composition at the surface of the grains and underneath. The study emphasizes important role of the grain surface in observed room temperature ferromagnetism. It seems that the ferromagnetic phase is correlated with oxygen build up at the surface.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 311-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of market valuation models in portfolio management
Zastosowanie modeli wyceny rynkowej w zarządzaniu portfelem
Autorzy:
Pastor, D.
Kisela, P.
Kovac, V.
Sabol, T.
Vajda, V.
Powiązania:
https://bibliotekanauki.pl/articles/406119.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska
Tematy:
valuation indicators
market valuation
portfolio management
investment strategy
efficiency market hypothesis
undervaluation
overvaluation
wskaźniki wyceny
wycena rynkowa
zarządzanie portfelem
strategia inwestycyjna
hipoteza wydajności rynku
zaniżona wycena
zawyżona wycena
Opis:
The paper deals with application of market valuation models in portfolio management. Its aim is to find out if it is possible to gain excess returns with simple investment strategies based on indicators constructed from some well-known ratios that are used to detect undervaluation or overvaluation of stock market. The theoretical background is followed by an overview of other studies in this field. In the next chapter Tregler’s market valuation indicators and the created investment strategies are discussed. Portfolio management approaches for different indicators were tested on historical S&P 500 monthly close prices. Any of chosen approaches was not able to achieve a higher return than basic buy and hold strategy. One strategy achieved return comparable to benchmark, but with lower risk, so it may be suitable for some portfolio managers.
Niniejszy artykuł dotyczy stosowania technik wyceny rynkowej w zarządzaniu portfelem. Jego celem jest dowiedzieć się, czy możliwe jest uzyskanie nadwyżki zysków dzięki prostym strategiom inwestycyjnym opartym na wskaźnikach skonstruowanych z kilku znanych współczynników, które używane są do wykrywania zaniżonej lub zawyżonej wyceny rynku akcji. Po tle teoretycznym zaprezentowano przegląd innych badań w tej dziedzinie. W kolejnym rozdziale omawiane są wskaźniki wyceny rynkowej Treglera oraz stworzone strategie inwestycyjne. Podejścia zarządzania portfelem dla różnych wskaźników testowane były na historycznych miesięcznych kursach zamknięcia S&P 500. Żadne z wybranych podejść nie było w stanie osiągnąć wyższego zwrotu niż podstawowa strategia „kup i trzymaj”. Jedna ze strategii osiągnęła zwrot porównywalny do poziomu odniesienia, ale z mniejszym ryzykiem, a więc może być ona odpowiednia dla niektórych zarządzających portfelami.
Źródło:
Polish Journal of Management Studies; 2015, 12, 1; 154-165
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of Sm addition on the microstructure and superconducting properties of YBCO bulk superconductors
Autorzy:
Volochová, D.
Diko, P.
Piovarči, S.
Antal, V.
Kováč, J.
Jirsa, M.
Powiązania:
https://bibliotekanauki.pl/articles/1054772.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.62.Dh
81.10.Fq
61.72.-y
74.25.Ha
74.25.Sv
Opis:
The effect of Sm addition on the microstructure and superconducting properties of Y-Ba-Cu-O (YBCO) bulk superconductors has been studied. Nominal composition: 1 mol YBa₂Cu₃O_{7-δ} + 0.25 mol Y₂O₃ + 1 wt% CeO₂ was enriched with different amounts of SmBa₂Cu₃O_y powder with the aim to increase critical current density, J_c, especially in higher magnetic fields by introducing additional pinning centers. Single grain YBCO bulk superconductors with SmBa₂Cu₃O_y (Y123-Sm) addition were prepared by the optimized top seeded melt growth process. Microstructure analysis, performed by polarized light microscope, revealed that SmBa₂Cu₃O_y addition leads to a higher amount of slightly coarser Y₂BaCuO₅ particles, which is related to lower critical current densities (J_c ≈ 6×10⁴ A/cm²) of the YBCO samples with SmBa₂Cu₃O_y addition in low magnetic fields. On the other hand, an enhancement of critical current density, J_c, in higher magnetic fields was observed for Y123-Sm samples. Moreover, a maximum trapped magnetic field, B_{tmax}, of 564 mT at 77 K in Y123-Sm, x=0.0025 sample (Ø 17.2 mm) was 43% higher than that for YBCO sample without any addition.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1009-1011
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on Magnetization Processes in Amorphous Rapidly Solidified FeSiB/CoSiB Bilayer Ribbons
Autorzy:
Capik, M.
Švec, P.
Marcin, J.
Kováč, J.
Sopko, M.
Janičkovič, D.
Škorvánek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1200803.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.80.+q
Opis:
Amorphous bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible using a double-nozzle technique. Temperature dependencies of magnetization and hysteresis loops have been investigated in a wide temperature range. At room temperature, the effects of interlayer stresses, induced in material due to different thermal expansion coefficients of two mechanically interconnected soft magnetic layers, resulted in rounded hysteresis loops with flattened central part, indicating a dominant role of magnetization rotational processes. With an increase of measurement temperature, the interlayer stresses are relieved and the hysteresis loops became more squared.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 120-121
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons
Autorzy:
Švec, P.
Mat'ko, I.
Marcin, J.
Kováč, J.
Vlasák, G.
Janičkovič, D.
Škorvánek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1534100.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
68.37.Lp
Opis:
Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 832-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Dependent Changes in Ag Doped YBCO Superconductors
Autorzy:
Volochová, D.
Antal, V.
Diko, P.
Šefčiková, M.
Zmorayová, K.
Kováč, J.
Weber, H.
Chaud, X.
Powiązania:
https://bibliotekanauki.pl/articles/1535451.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Sv
74.62.Bf
74.62.Dh
74.62.Fj
Opis:
Magnetization measurements at 77 K were conducted on the single-crystalline samples of YBCO superconductor doped with Ag prepared by the top-seeded melt-growth process. The single-grain samples had a nominal composition $Y_{1.5}Ba_2(Cu,Ag)_3O_{y}$. Magnetization measurements on the samples, oxygenated by two different processes: by standard oxygenation and by high pressure oxygenation, repeated after 24 months, revealed time dependent changes in magnetization behaviour and critical transition temperatures, T_{c}, which could be associated with redistribution of oxygen vacancies and their interaction with Ag dopant atoms.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1047-1048
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Sm and Yb Pollution on Superconducting Properties of YBCO Bulk Superconductors
Autorzy:
Volochová, D.
Jurek, K.
Radušovská, M.
Piovarči, S.
Antal, V.
Kováč, J.
Jirsa, M.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1371573.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.Bf
74.72.-h
81.40.Rs
74.25.Ha
74.81.Bd
74.25.Op
Opis:
$YBa_{2}Cu_{3}O_{7-δ }$ (YBCO, Y-123) bulk superconductors with a nominal composition $Y_{1.5}Ba_{2}Cu_{3}O_{x}$ and 1 wt% $CeO_{2}$ addition were prepared by the Top Seeded Melt Growth (TSMG) process. Small single-crystalline pieces, cut from the $SmBa_{2}Cu_{3}O_{y}$ (Sm-123) bulk, were used for seeding of epitaxial growth. Wavelength-dispersive spectrometry (WDS) confirmed the presence of 0.1 wt% Sm from the seed and 0.25 wt% Yb from the substrate, practically in the whole sample volume. The influence of this Sm and Yb contamination on superconducting properties of grown bulk materials is reported.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 358-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AP-MOVPE Technology and Characterization of InGaAsN p-i-n Subcell for InGaAsN/GaAs Tandem Solar Cell
Autorzy:
Dawidowski, W.
Ściana, B.
Zborowska-Lindert, I.
Mikolásek, M.
Latkowska, M.
Radziewicz, D.
Pucicki, D.
Bielak, K.
Badura, M.
Kováč, J.
Tłaczała, M.
Powiązania:
https://bibliotekanauki.pl/articles/226630.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dilute nitrides
AP MOVPE
subcell
tandem solar cell
J-V characteristics
Opis:
Tandem (two p-n junctions connected by tunnel junction) and multijunction solar cells (MJSCs) based on AIIIBV semiconductor compounds and alloys are the most effective photovoltaic devices. Record efficiency of the MJSCs exceeds 44% under concentrated sunlight. Individual subcells connected in series by tunnel junctions are crucial components of these devices. In this paper we present atmospheric pressure metal organic vapour phase epitaxy (AP-MOVPE) of InGaAsN based subcell for InGaAsN/GaAs tandem solar cell. The parameters of epitaxial structure (optical and electrical), fabrication process of the test solar cell devices and current-voltage (J-V) characteristics are presented and discussed.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 2; 151-156
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structural Characterization of Ni-Ti-Zr Metallic Glass
Autorzy:
Katuna, Yu.
Lisnichuk, M.
Saksl, K.
Girman, V.
Gamcová, J.
Balga, D.
Ďurišin, M.
Kováč, J.
Sovák, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032136.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
68.37.Ma
68.37.Lp
Opis:
Metallic glasses, in contrast to its crystalline counterparts, exhibit unique mechanical and structural properties, which make them attractive for practical applications. Especially Ni-Ti-Zr metallic glass is a promising alloy for micromechanical systems because of its known shape memory properties. Shape memory effect is connected with structural phase transformation. In this paper, the ambient-temperature-structure of Ni-Ti-Zr metallic glass is investigated using transmission electron microscopy and synchrotron X-ray diffraction, the surface and chemical analysis is documented using scanning electron microscopy. Thermal stability of the alloy has been determined using differential scanning calorimetry.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 750-752
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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