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


Wyświetlanie 1-22 z 22
Tytuł:
Symulacyjne badanie procesu uszkadzania klatki wirnika silnika indukcyjnego podczas jego rozruchu
Simulation testing of damage process in induction motor rotor cage during motor start-up
Autorzy:
Antal, M.
Zawilak, J.
Powiązania:
https://bibliotekanauki.pl/articles/320343.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
silnik indukcyjny
symulacja polowo-obwodowa
uszkodzenie prętów klatki wirnika
induction motor
field-circuit simulation
broken rotor bars
Opis:
W pracy przedstawiono wyniki polowo-obwodowej symulacji takiego rozruchu silnika indukcyjnego obciążonego stałym momentem znamionowym, podczas którego pękają kolejne pręty klatki wirnika. Badania wykonano przy użyciu zweryfikowanego pomiarowo modelu silnika malej mocy (1,5 kW). W obliczeniach założono, że w czasie trwającego 0,6 s rozruchu pękają kolejne, sąsiadujące ze sobą, pręty wirnika. Pierwszy z nich pęka po czasie 0,1 s od rozpoczęcia rozruchu. W wyniku tego uszkodzenia wzrastają prądy w sąsiednich prętach klatki, co może być przyczyną pęknięcia następnego pręta. Taki założony przebieg zjawiska zamodelowano, przyjmując czasy wyłączenia kolejnych sześciu prętów. W wyniku obliczeń wyznaczono zmiany rozkładu pola magnetycznego i następnie czasowe charakterystyki momentu, prędkości obrotowej, prądów fazowych stojana oraz prądów prętów klatki wirnika.
The work presents field-circuit simulation results of squirrel cage, induction motor start-up with constant nominal load. During the start-up consecutive rotor bars are cracking. Computations were realized in the field-circuit model (Fig. 1) of small power (1.5 kW) squirrel cage induction motor, verified by measurements. In computation assumed that during the simulation (0.6 s) consecutive neighboring rotor bars are cracking. The first of them is cracking 0.1 s after start-up. As a result of this failure, currents of the neighboring rotor bars are increasing, which could be a reason of following rotor bar cracks. Assumed course of phenomenon was modeled for next 6 rotor bars that are disconnected in assumed times. Variations of magnetic field distribution (Fig. 2) and transient characteristics of electromagnetic torque (Fig. 3), rotational speed (Fig. 4), stator currents (Fig. 5) and rotor bars currents (Fig. 6) were realized computationally.
Źródło:
Elektrotechnika i Elektronika; 2006, 25, 2; 114-118
1640-7202
Pojawia się w:
Elektrotechnika i Elektronika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprzężone pole magneto–termiczne silnika indukcyjnego z uszkodzoną klatką wirnika
Coupling magneto-thermal field of induction motor with broken rotor bars
Autorzy:
Antal, M.
Zawilak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1374910.pdf
Data publikacji:
2005
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
pole magneto-termiczne
silniki indukcyjne
wirnik
klatka wirnika
uszkodzenia silnika
Opis:
The work presented calculation results of a small power (1.5 kW) squirrel cage motor warm-up. Computation was realized with normal load. There is two models: one with non-damaged rotor and second one with three broken rotor bars. Calculation of coupling transient magneto-thermal field was realized with two-dimensional field-circuit motor model. There is a linear temperature characteristic of aluminum resistivity in squirrel cage, and a linear temperature characteristic of a thermal parameters in squirrel cage and core. Heating characteristic of motor with non-damaged rotor and another one with three broken rotor bars was compared. Heat distribution in rotor was investigated in both situation, in thermal transient state and after.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2005, 72; 267-272
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania uszkodzeń uzwojenia stojana klatkowego silnika indukcyjnego
Testing of failures in stator winding of squirrel-cage induction motor
Autorzy:
Antal, M.
Antal, L.
Zawilak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1374346.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik indukcyjny klatkowy
uszkodzenie
uzwojenie stojana
model polowo-obwodowy
Opis:
Phenomena associated with inter-turn short-circuit in stator winding of squirrel-cage motor were investigated. Investigations were realized with field-circuit mathematical model and physical model of motor. Short-circuit happens when motor is working with nominal load. Based on this assumption time characteristics of stator phase currents, currents in short-circuited turns and instantaneous power of motor, were calculated. Two causes were investigated: short-circuit of four turns and whole coil (51 turns). Influence of resistance value in short-circuited point on electromechanical phenomena was investigated too.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2007, 76; 83-88
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ szerokości otwarcia żłobków na parametry eksploatacyjne silnika indukcyjnego małej mocy
Influence of slots width opening on the operating parameters of a small power induction motor
Autorzy:
Antal, L.
Antal, M.
Zawilak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2076289.pdf
Data publikacji:
2005
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silniki indukcyjne
silniki elektryczne
stojan
wirnik
Opis:
The work presents calculation results of a small (1.5 kW) squirrel cage induction motor. The influence of slots width opening on efficiency and other operating characteristics of the motor was examined. The efficiency calculations were realized by finding distribution of time-harmonic magnetic field in a two-dimensional field-circuit motor model. Calculations for different combination of stator and rotor slot width openings showed influence of these geometric parameters on shape of magnetic field in motor air-gap. Field harmonic analysis shows that there is a possibility to decrease slot harmonics and in consequence, increase motor efficiency and other parameters.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2005, 73; 125-130
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania skutków cieplnych zwarć zwojowych w uzwojeniach stojana silnika indukcyjnego
Effects of inter-turns short-circuits in stator winding of squirrel-cage induction motor
Autorzy:
Antal, L.
Gwoździewicz, M.
Marciniak, T.
Antal, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812151.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silnik indukcyjny
zwarcia zwojowe uzwojenia stojana
badania cieplne
Opis:
Phenomena associated with inter-turn short-circuit in stator winding of low power squirrel-cage motor were investigated. Investigations were realized with physical model of the motor with adapted stator winding coil with terminals to make inter-turns short-circuit. During laboratory tests 4, 12, 22 and 51 turns of the 306 phase stator winding were short-circuited. Thermal phenomena during 30 seconds shortcircuits were investigated. After short-circuits thermograms of the stator winding were recorded.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 316-324
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologiczne i eksploatacyjne skutki zmian kształtu pręta klatki silnika indukcyjnego dużej mocy
Technological and operating effects of rotor bar shape modification in high power induction motor
Autorzy:
Antal, M.
Chamerski, J.
Piłat, W.
Antal, L.
Powiązania:
https://bibliotekanauki.pl/articles/1374217.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna indukcyjna
silnik indukcyjny
modelowanie polowo-obwodowe
pręt
klatka wirnika
wirnik
Opis:
Field-circuit model of electric machine can be used for investigation of its structural components shape influence on operating characteristics. The high power induction motor model was applied to examine effects of rotor bar shape modification, consisting in replacement the trapezium shape bar with rectangular bar. Torque and current characteristics and characteristic quantity of start-up torque and current, maximum torque and critical slip were determined with field-circuit model. Electromagnetic torque, currents and rotational speed, as function of time during motor start, were determined also. The effect of rotor bar height change were examined in similar way. All rotor bar shape modifications were realized with constant cross-sectional area. The results confirm, that the exchange of bars in considered design will bring economic profits and won't cause significant deterioration of operating features.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2008, 79; 17-22
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie magnesów trwałych w silnikach elektrycznych dużej mocy
Application of permanent magnets in large power electric motors
Autorzy:
Kisielewski, P.
Antal, M.
Gierak, D.
Zalas, P.
Powiązania:
https://bibliotekanauki.pl/articles/1372661.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik elektryczny dużej mocy
maszyna elektryczna
magnes trwały
Opis:
Design of a large power permanent magnet synchronous motor was presented. The solutions of the problems occurred during the motor design process were discussed. A method of the motor starting using variable number of poles was presented. This method enables an asynchronous starting the motor at a first speed and then change-over into a second one and synchronization. An assembly method of the permanent magnets into a rotor was also presented. The assembling problem regarding a big interaction between rotor permanent magnets and stator core was solved. The permanent magnets are assembling into the rotor after its mounting in the motor.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 4, 92; 187-192
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania eksperymentalne rozruchu silnika synchronicznego wzbudzanego magnesami trwałymi
Experimental tests of permanent magnet synchronous motor start-up
Autorzy:
Antal, L.
Gwoździewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1372551.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
silnik synchroniczny
magnes trwały
rozruch bezpośredni
maszyna elektryczna
Opis:
Results of small power (Pn = 2kW) permanent magnet synchronous motor start-up experimental tests were presented. Motor was supplied directly from the power grid. To determine the maximum start-up torque motor was loaded with different values of constant load torque. During starts-up voltages, currents, torque and rotational speed were measured. The same measurements were done for the induction motor (Pn = 1,5 kW) which is base construction for the investigated permanent magnet synchronous motor. Comparison of the obtained results of basic electrical and mechanical quantities enabled to starting properties of the line start permanent magnet synchronous motor and its synchronization ability.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 5, 93; 131-136
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the rotor cage faults in an induction motor on its running. experimental results
Wpływ uszkodzeń klatki wirnika silnika indukcyjnego na jego pracę. Badania eksperymentalne
Autorzy:
Gwoździewicz, M.
Antal, L.
Powiązania:
https://bibliotekanauki.pl/articles/1807515.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction motor
rotor cage faults
motor diagnostics
Opis:
W artykule przedstawiono wyniki badań eksperymentalnych silnika indukcyjnego z uszkodzoną klatką wirnika. Do badań użyto silnika indukcyjnego typu 90L-4 o mocy 1,5 kW i prędkości synchronicznej 1500 rpm z wirnikami o różnym stopniu uszkodzenia klatki wirnika. Zbadano wpływ uszkodzeń klatki wirnika na przyrost temperatury stojana i wirnika, przebieg momentu oraz poślizg silnika.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2011, 65, 31; 17-23
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in YBCO Single Grain Bulk Superconductor Exposed to Air Moisture
Autorzy:
Piovarči, S.
Antal, V.
Kaňuchová, M.
Radušovská, M.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1202072.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.-q
68.43.-h
68.37.-d
Opis:
Changes in bulk single grain YBCO superconductor at exposition to air were studied. The increase of the sample weight caused by reaction with air moisture was observed by weighing the samples over two months period. Thermal analyses and mass spectrometry of the exposed samples has shown evolution of water and oxygen during sample heating. Observation with scanning electron microscope confirmed the formation of some nanosize phases at the inner sample surfaces. XPS spectra done on the freshly cleaved and on the air exposed (001) surfaces confirmed changes in Ba and Cu bonds. Observed structural changes did not caused systematic changes in measured trapped field.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 364-365
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Complex Characterization of Magnetic Nanoparticles in Magnetic Fluid
Autorzy:
Kubovčíková, M.
Antal, I.
Kováč, J.
Závišová, V.
Koneracká, M.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1201928.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.Fk
78.67.Bf
36.40.Cg
47.65.Cb
75.50.Mm
75.30.Cr
Opis:
This paper deals with the preparation and complex characterization of magnetite nanoparticles (MNPs), stabilized with sodium oleate (SO), by the routine methods such as infrared spectroscopy (FTIR), magnetic measurements, scanning electron microscopy (SEM) and dynamic light scattering (DLS). The FTIR spectra showed that SO molecules were linked to MNPs through chemical bonding. Magnetic measurements proved that the MNPs are superparamagnetic in nature. Four different methods were used to determine the size and size distribution of the MNPs: SEM, DLS, differential centrifugal sedimentation (DCS) and magnetic measurements. SEM analysis showed a relatively narrow size distribution of roughly spherical MNPs with a mean diameter of 61 nm. DLS analysis confirmed monodispersed MNPs production with hydrodynamic diameter of 75 nm. The size distribution determined by DCS was found to be 69 nm. Finally, the calculated magnetic core diameter obtained from magnetization curve was 10 nm. The obtained results demonstrate that SO coated MNPs fulfil the requirements for a useful drug delivery system.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 268-269
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
Critical Current Density and Microstructure of $NdBa_2Cu_3O_7$ Single Crystal
Autorzy:
Diko, P.
Zmorayová, K.
Šefčiková, M.
Antal, V.
Kováč, J.
Yao, X.
Powiązania:
https://bibliotekanauki.pl/articles/1535339.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Sv
74.62.Bf
Opis:
The top-seeded solution growth method was used to grow NdBCOss single crystals in air. The microstructure of the samples has shown that the oxygenation crack structure developed in the single crystals. The intrinsic critical current density was estimated to be at least twice higher than the value of volume critical current density determined from the magnetization measurements.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1028-1030
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of Y-123/Y-211 Bulk Superconductors with $BaCeO_{3}$ and $BaO_{2}$ Addition
Autorzy:
Zmorayova, K.
Antal, V.
Radusovska, M.
Piovarci, S.
Volochova, D.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1371616.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.25.Ha
74.62.Bf
74.62.Dh
81.10.Fq
81.30.Fb
Opis:
$YBa_{2}Cu_{3}O_{7-δ}$ (YBCO) bulk single-grain superconductors were prepared by a TSMG process. $CeO_{2}$, $BaCeO_{3}$ and $BaO_{2}$ powders were added to nominal composition $Y_{1.5}Ba_{2}Cu_{3}O_{7}$ with the aim to refine $Y_{2}BaCuO_{5}$ (Y-211) secondary particles. Added powders were refined by milling in a friction milling and characterized by X-ray powder difractometry. Thermal properties of the systems were characterized by DTA. Microstructure of samples was studied by PLM. Successful refinement of Y-211 particles size was confirmed by IP measurements. Transition temperatures and field dependences of the magnetic moment for further determination of the critical current densities were obtained using a VSM.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 366-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elimination of Magnetic Nanoparticles with Various Surface Modifications from the Bloodstream in vivo
Autorzy:
Tomasovicova, N.
Khmara, I.
Koneracka, M.
Zavisova, V.
Kubovcikova, M.
Antal, I.
Kovac, J.
Muckova, M.
Kopcansky, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032816.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Gg
75.50.Tt
87.85.jj
Opis:
The magnetic nanoparticles with the core diameter 10 nm stabilized by sodium oleate and bovine serum albumin in phosphate buffer have been modified by different biocompatible substances such as poly(ethylene glycol) (PEG), dextran (DEX), and polyvinylpyrrolidone (PVP). Prepared biocompatible magnetic fluids were characterized to obtain the particle size distribution using scanning electron microscopy and the dynamic light scattering method. To study the elimination of different modified magnetic nanoparticles from bloodstream, the biocompatible samples were applied intravenously to the mice bloodstream with further blood specimens collecting in given time intervals. Magnetic moment of the lyophilized blood samples was measured by SQUID magnetometer. Time dependence of magnetic moment of magnetic nanoparticles and magnetic nanoparticles modified by DEX, PEG and PVP normalized to the Fe₃O₄ showed that the circulation time of magnetic nanoparticles in the bloodstream depends on the substance used for modification. The unmodified magnetic nanoparticles were trapped by reticuloendothelial system within 1 h while magnetic nanoparticles modified by DEX, PEG and PVP circulated in blood up to 3 h.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1159-1161
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:
Microstructure and Magnetic Properties of La-Ca-Sr-Mn-O Perovskite Ceramics
Autorzy:
Zmorayova, K.
Antal, V.
Radusovska, M.
Piovarci, S.
Kováč, J.
Kavecansky, V.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367705.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.47.Lx
77.80.Bh
81.20.Ev
81.30.Fb
Opis:
$La_{0.67}Ca_{0.33-x}Sr_{x}MnO_{3}$ (x=0.33; 0.03; 0) (LCSM) perovskite magnetocaloric ceramics were prepared by solid state synthesis in air and sintering at 1520°. The phase composition was checked by x-ray powder diffraction. Microstructure analyses were done by scanning electron microscopy. The influence of high pressure oxygenation on magnetisation behaviour is shown.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 168-169
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Magnetic Nanoparticles
Autorzy:
Khmara, I.
Kubovcikova, M.
Koneracka, M.
Kalska-Szostko, B.
Zavisova, V.
Antal, I.
Rajnak, M.
Dankova, Z.
Kavecansky, V.
Omastova, M.
Kopcansky, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030437.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
61.05.Qr
61.05.cp
Opis:
The magnetic nanoparticles with core diameter 10 nm were modified by poly-L-lysine to bind antibody for cancer cell detection. Prepared biocompatible magnetic fluid (MFPLL) was characterized by dynamic light scattering method to obtain the particle size distribution. The microstructure of the MNPs and MFPLL samples were studied by transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy. Magnetic properties of the samples were measured by SQUID magnetometer and superparamagnetic behaviour of the samples was confirmed.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 704-706
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chlorophyll fluorimetry as a method for studying light absorption by photosynthetic pigments in marine algae
Autorzy:
Matorin, D.N.
Antal, T.K.
Ostrowska, M.
Rubin, A.B.
Ficek, D.
Majchrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/48459.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
alga
chlorophyll a concentration
photosynthetic pigment
fluorescence
marine alga
phytoplankton
light absorption
chlorophyll fluorimenty
Opis:
Using laboratory cultures of algae and natural phytoplankton populations from Nhatrang Bay (South China Sea), the relationship between the chlorophyll fluorescence F0, the chlorophyll a concentration Ca and light absorption capacities of algae cells was studied. It is shown that the ratio F0/Ca depends mainly on the species composition of the algae population; hence, the concentration Ca can be measured with the fluorescence method with acceptable accuracy only when the species composition of algae populations varies over a rather narrow range. The fluorescence F0 can, however, be a good index of the total absorption capacities of different phytoplankton species, because the intensity of F0 depends on the sum total of light absorbed by all photosynthetic pigments in a plant cell. Thus, the fluorescence F0 measures not only the concentration of chlorophyll a, but that of all photosynthetic pigment concentrations.
Źródło:
Oceanologia; 2004, 46, 4
0078-3234
Pojawia się w:
Oceanologia
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:
Measurement of phytoplankton photosynthesis rate using a pump-and-probe fluorometer
Autorzy:
Antal, T.K.
Venediktov, P.S.
Matorin, D.N.
Ostrowska, M.
Wozniak, B.
Rubin, A.B.
Powiązania:
https://bibliotekanauki.pl/articles/47511.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
photosynthesis rate
photosynthesis measurement
fluorometer
plant luminescence
fluorometric method
primary production
Opis:
In this work we have studied the possibility of determining the rate of phytoplankton photosynthesis in situ using a submersible pump-and-probe fluorometer in water areas differing in their trophic level, as well as in climatic and hydrophysical characteristics. A biophysical model was used to describe the relationship between photosynthesis, underwater irradiance, and the intensity of phytoplankton fluorescence excited by an artificial light source. Fluorescence intensity was used as a measure of light absorption by phytoplankton and for assessing the efficiency of photochemical energy conversion at photosynthetic reaction centers. Parameters of the model that could not be measured experimentally were determined by calibrating fluorescence and irradiance data against the primary production measured in the Baltic Sea with the radioactive carbon method. It was shown that the standard deviation of these parameters in situ did not exceed 20%, and the use of their mean values to estimate the phytoplankton photosynthetic rate showed a good correlation between the calculated and measured data on primary production in the Baltic (r = 0.89), Norwegian (r = 0.77) and South China (r = 0.76) Seas.
Źródło:
Oceanologia; 2001, 43, 3; 291-313
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of BSA Protein on the Contrast Properties of Magnetite Nanoparticles during MRI
Autorzy:
Strbak, O.
Kubovcikova, M.
Baciak, L.
Khmara, I.
Gogola, D.
Koneracka, M.
Zavisova, V.
Antal, I.
Masarova, M.
Krafcik, A.
Kopcansky, P.
Dobrota, D.
Frollo, I.
Powiązania:
https://bibliotekanauki.pl/articles/1032224.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.61.-c
75.75.Fk
87.15.kp
Opis:
The aim of the study was to establish whether there is a significant change in the MRI contrast of magnetite nanoparticles, after BSA protein binding on the surface of particles. The rationale is the applicability of this feature in clinical practice for the tracking of specific proteins which are often associated with various pathologies. Contrast agents could bind to this specific marker, with the change in MRI contrast indicating the presence of pathology. We found that changes in relative contrast acquired at low-field MRI offer potential for the differentiation of magnetite nanoparticles with and without BSA protein. However, the variations in the transverse relaxation time (T₂) and transverse relaxivity (r₂), acquired at high-field MRI, were too small to be applicable for biomedical applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1102-1104
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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