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Wyświetlanie 1-15 z 17
Tytuł:
Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Bulk Alloys
Autorzy:
Przybył, A.
Pawlik, K.
Pawlik, P.
Gębara, P.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1387335.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.75.-c
75.75.Cd
Opis:
The aim of this paper was to study the phase constitution, magnetic properties and magnetization reversal processes in the rapidly solidified bulk (Pr,Dy)-(Fe,Co)-B alloys doped with Zr, Ti, Mn and Ni. The 3 mm outer diameter tubes samples of the $Pr₈Dy₁Fe₆₀Co₇Ni_{(6x)}MnₓB₁₄Zr₁Ti₃$ (where x = 0, 3, 6) alloys were produced by suction-casting technique. The admixture of Zr was introduced in order to improve their glass forming abilities while Dy was substituted to enhance the magnetocrystalline anisotropy of hard magnetic phase. The effect of Ni and Mn addition on the phase constitution and magnetic properties was studied in the presented work.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 579-581
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy Analysis of the Box-Counting Algorithm
Autorzy:
Górski, A.
Drożdż, S.
Mokrzycka, A.
Pawlik, J.
Powiązania:
https://bibliotekanauki.pl/articles/1408964.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Df
02.60.Gf
47.52.+j
Opis:
Accuracy of the box-counting algorithm for numerical computation of the fractal exponents is investigated. To this end several sample mathematical fractal sets are analyzed. It is shown that the standard deviation obtained for the fit of the fractal scaling in the log-log plot strongly underestimates the actual error. The real computational error was found to have power scaling with respect to the number of data points in the sample $(n_{tot})$. For fractals embedded in two-dimensional space the error is larger than for those embedded in one-dimensional space. For fractal functions the error is even larger. Obtained formula can give more realistic estimates for the computed generalized fractal exponents' accuracy.
Źródło:
Acta Physica Polonica A; 2012, 121, 2B; B-28-B-30
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Tungsten Addition on Phase Constitution and Magnetic Properties of the Bulk $Fe_{65}Pr_{9}B_{26-x}W_x$ Alloys
Autorzy:
Filipecka, K.
Pawlik, P.
Pawlik, K.
Gębara, P.
Przybył, A.
Pruba, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402336.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
75.50.Kj
71.20.Eh
Opis:
The effect of tungsten addition on phase constitution and magnetic properties of the bulk $Fe_{65}Pr_9B_{26-x}W_{x}$ (where x=2, 4, 6, 8) alloys was studied. The base alloys were prepared by arc-melting of the high purity elements under Ar atmosphere. Samples were produced by suction of an arc-molten alloy to a water-cooled copper mould (the suction-casting method). In order to develop nanocrystalline structure, the samples were subjected to annealing. Heat treatment resulted in an evolution of the phase constitution that caused changes in magnetic properties of the alloys. X-ray diffractometry was used to determine the phase composition of annealed samples. The analysis showed presence of hard magnetic $Pr_2Fe_{14}B$, paramagnetic $Pr_{1+x}Fe_4B_4$ and soft ferromagnetic α-Fe phases of annealed samples. The room temperature magnetic properties were determined from hysteresis loops measured by VSM magnetometer in the external magnetic field up to 2 T. The highest hard magnetic parameters were measured for the rod sample of $Fe_{65}Pr_9B_{20}W_6$ annealed at 1003 K for 5 min.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 104-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Composition and Magnetic Properties of the Nanocrystalline $Fe_{64.32}Pr_{9.6}B_{22.08}W_{4}$ Alloy
Autorzy:
Filipecka, K.
Pawlik, K.
Pawlik, P.
Wysłocki, J.
Gębara, P.
Przybył, A.
Powiązania:
https://bibliotekanauki.pl/articles/1367656.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
75.50.Kj
71.20.Eh
Opis:
The aim of the present work was to study the influence of annealing conditions on magnetic properties and the phase constitution of rapidly solidified $Fe_{64.32}Pr_{9.6}B_{22.08}W_{4}$ alloy ribbons. The base alloy was prepared by arc-melting of the high purity elements under an Ar atmosphere. Subsequently the ribbon samples were obtained by melt-spinning technique under low pressure of Ar. In order to develop nanocrystalline structure, the samples were annealed at 1003 K for 5, 10, 20 and 30 min. The room temperature magnetic properties were determined from hysteresis loops measured by VSM magnetometry in the external magnetic field up to 2 T. For comparison the influence of annealing temperature on magnetic properties was studied for the same alloy composition. The ribbons were annealed at temperatures from 929 K to 1023 K for 5 min. X-ray diffractometry was used to determine the phase composition of annealed ribbons. Heat treatment resulted in an evolution of the phase constitution, that caused changes in magnetic properties of the alloy.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 164-165
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and Phase Constitution of the Nanocrystalline Fe₆₅Pr₉B₁₈W₈ Alloy Ribbons
Autorzy:
Filipecka, K.
Pawlik, P.
Kozdraś, A.
Filipecki, J.
Pawlik, K.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030237.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
75.50.Kj
71.20.Eh
Opis:
The aim of the present work was to investigate the phase constitution and magnetic properties of the rapidly solidified Fe₆₅Pr₉B₁₈W₈ alloy ribbons in the as-cast state and subjected to annealing. The base alloy was prepared by arc-melting of the high purity elements under the Ar atmosphere. The ribbon samples were obtained by the melt-spinning technique under a low pressure of Ar. The studies have shown an amorphous structure of the ribbon in the as-cast state and its soft magnetic properties. Annealing at various temperatures for 5 min resulted in an evolution of the phase constitution that caused changes in magnetic properties of the alloy. The crystallization behavior was studied using differential scanning calorimetry. In order to determine the phase composition of annealed ribbons, X-ray diffractometry was used. The evolution of microstructure and phase constitution was verified by the Mössbauer spectroscopy. The magnetic properties were determined from hysteresis loops measured by a vibrating sample magnetometer in the external magnetic field up to 2 T at room temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1207-1211
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and Phase Constitution of the Nanocrystalline $(Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x}$ (where x=1, 2, 3, 4) Alloy Ribbons
Autorzy:
Kaźmierczak, M.
Pawlik, K.
Pawlik, P.
Gębara, P.
Przybył, A.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402329.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
91.60.Pn
Opis:
In the present work the magnetic properties and phase constitution of $(Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x}$ (where x=1, 2, 3, 4) alloys in a form of ribbons were investigated. The ribbon samples were obtained by controlled atmosphere melt-spinning technique. In order to generate the nanocrystalline microstructure, ribbons were annealed at various temperatures (from 923 K to 1023 K) for 5 min. Subsequent annealing resulted in an evolution of the phase constitution accompanied by a change of their magnetic properties. The X-ray diffraction studies show presence of hard magnetic $Nd_{2}Fe_{14}B$, paramagnetic $Nd_{1+\epsilon}Fe_{4}B_{4}$ and ferromagnetic metastable $Nd_{2}Fe_{23}B_{3}$ phases. The best hard magnetic parameters were measure for annealed ribbons of the $(Nd_{10}Fe_{67}B_{23})_{96}Nb_{4}$ alloy.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 91-93
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Annealing Temperature on the Phase Constitution and Magnetic Properties of the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ Alloy Ribbons
Autorzy:
Przybył, A.
Pawlik, K.
Pawlik, P.
Gębara, P.
Kaszuwara, W.
Wysłocki, J.
Filipecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402331.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
91.60.Pn
Opis:
Melt-spun ribbons were produced from the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ base alloy at the surface velocity of the cooper wheel of 30 m/s. The studies showed amorphous structure of ribbons and their soft magnetic properties. X-ray diffraction was used to determine phase constitution of all obtained samples. Annealing of ribbons caused formation of nanocomposite structure, which was a result of coexistence of hard magnetic RE₂(Fe,Co)₁₄B and soft magnetic α-Fe phases. Basic magnetic properties such as: coercivity $\text{}_{J}H_{c}$, remanence $J_{r}$ and maximum energy product $(BH)_\text{max}$ were determined from the measured hysteresis loops. The microstructure of selected specimens was observed by transmission electron microscopy technique.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 94-97
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Conditions on Magnetic Properties and Phase Constitution of the Rapidly Solidified Fe₆₅Pr₉B₁₈W₈ Alloy Ribbons
Autorzy:
Filipecka, K.
Pawlik, P.
Kozdraś, A.
Filipecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398810.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
75.50.Kj
71.20.Eh
Opis:
In the present work, the influence of annealing conditions on magnetic properties and phase constitution of the rapidly solidified Fe₆₅Pr₉B₁₈W₈ alloy ribbons, were investigate. Samples were prepared by arc-melting of high purity constituent elements under the Ar atmosphere. Ribbons were obtained by melt-spinning technique under low pressure of Ar. The ribbons in as-cast state had amorphous structure and soft magnetic properties. Heat treatment, carried out at various temperatures (from 923 K to 1023 K) for 5 min, resulted in an evolution of the phase constitution that caused changes in magnetic properties of the alloy. The crystallization behavior was studied using differential scanning calorimetry and X-ray diffractometry. The room temperature magnetic properties were determined from hysteresis loops measured by VSM magnetometer in the external magnetic field up to 2 T.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 185-187
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the magnetization reversal processes in nanocrystalline Nd-Fe-B alloys doped by Nb
Autorzy:
Kaźmierczak, M.
Pawlik, P.
Wysłocki, J.
Wnuk, I.
Gębara, P.
Pawlik, K.
Przybył, A.
Powiązania:
https://bibliotekanauki.pl/articles/1052622.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the following article the magnetic properties and phase composition of (Nd₁₀Fe₆₇B₂₃)_{100-x}Nb_{x} (where x=5, 6, 7, 8, 9) alloys in the form of ribbons are discussed. The X-ray diffraction studies revealed the coexistence of amorphous and nanocrystalline structures consisting of Nd₂Fe₁₄B, Nd_{1+ε}Fe₄B₄ and metastable Nd₂Fe₂₃B₃ phases. The shape of M_{rev} (M_{irr}) suggests that the magnetization reversal proceeds through the nucleation of the reversal domain for the ribbon doped with 5-7 at.% of Nb and the subsequent pinning of the domain walls for ribbons doped with 8 and 9 at.% of Nb.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 789-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the Distribution of Stochastic Impulses Acting on a High Frequency System through an Analysis of Its Vibrations
Autorzy:
Jabłoński, M.
Ozga, A.
Korbiel, T.
Pawlik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1504209.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
45.30.+s
Opis:
The motion of an oscillator with damping excited by impulses has the form $ξ_t = \frac{1}{\sqrt{a^2 - b^2}} \sum_{0
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 977-980
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomagnetic Properties of $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (x=0, 0.6) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Skorvanek, I.
Marcin, J.
Pawlik, K.
Przybył, A.
Wysłocki, J.
Szwaja, M.
Filipecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1367677.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, Curie temperature, refrigeration capacity and cooling power of the $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (where x=0, 0.6) alloys, are investigated. The value of Curie temperature was found to be 280 and 290 K for x=0 and 0.6, respectively. The determined values of cooling power (RCP) and refrigeration capacity (RC) differ only slightly for both investigated alloys. The maximum values of RCP and RC obtained under the change of external magnetic field from 0 to 5 T are 433 J/kg (for x=0) and 290 J/kg (for x=0.6), respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 166-167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Residual Stresses on the Coercive Field Strength of Drawn Wires
Autorzy:
Suliga, M.
Kruzel, R.
Chwastek, K.
Jakubas, A.
Pawlik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030254.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
75.60.-d
75.60.Ej
Opis:
Residual stresses occurring in drawn wires due to technological process affect their quality, which in turn may have a substantial impact on safety of use and "life" of ready-made products. Measurements of magnetic properties of the wires like coercive field strength may be useful for monitoring the level of residual stresses. The present paper examines the relationship between the drawing speed and the coercive field strength in high carbon wires. It has been found that for drawing speeds not exceeding 20 m/s the coercive field strength is proportional to residual stresses on wire surface.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1114-1116
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies of J-PET detector spatial resolution
Autorzy:
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Alfs, D.
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, M.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Shivani, -
Silarski, M.
Skurzok, M.
Sharma, N.
Sharma, S.
Shopa, R.
Strzelecki, A.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1057928.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Mc
87.57.uk
87.10.Rt
34.50.-s
Opis:
The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1645-1648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector
Autorzy:
Mohammed, Muhsin
Białas, P.
Curceanu, C.
Czerwiński, E.
Dulski, K.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shivani, ---
Skurzok, M.
Silarski, M.
Wieczorek, A.
Wiślicki, W.
Zgardzińska, B.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030045.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Fr
41.75.Ht
77.22.Ej
36.10.Dr
85.75.Mm
87.57.uk
Opis:
A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1486-1489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis Procedure of the Positronium Lifetime Spectra for the J-PET Detector
Autorzy:
Dulski, K.
Zgardzińska, B.
Białas, P.
Curceanu, C.
Czerwiński, E.
Gajos, A.
Głowacz, B.
Gorgol, M.
Hiesmayr, B.
Jasińska, B.
Kisielewska-Kamińska, D.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krawczyk, N.
Krzemień, W.
Kubicz, E.
Mohammed, Muhsin
Pawlik-Niedźwiecka, M.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Raj, J.
Rudy, Z.
Sharma, N.
Sharma, S.
Shivani, Shivani
Shopa, R.
Silarski, M.
Skurzok, M.
Wieczorek, A.
Wiślicki, W.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033298.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Kf
13.30.Ce
14.60.-z
78.47.-p
Opis:
Positron annihilation lifetime spectroscopy has shown to be a powerful tool to study the nanostructures of porous materials. Positron emission tomograph is a device allowing imaging of metabolic processes e.g. in human bodies. A newly developed device, the Jagiellonian PET will allow positron annihilation lifetime spectroscopy in addition to imaging, thus combining both analyses providing new methods for physics and medicine. In this contribution we present a computer program that is compatible with the Jagiellonian PET software. We compare its performance with the standard program LT 9.0 by using positron annihilation lifetime spectroscopy data from hexane measurements at different temperatures. Our program is based on an iterative procedure, and our fits prove that it performs as good as LT 9.0.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1637-1640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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