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Wyświetlanie 1-15 z 34
Tytuł:
The Role of Temperature on the Magnetization Process in CoFeZrB/FeCuNbMoSiB Hybrid Ferromagnets
Autorzy:
Dobák, S.
Füzer, J.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032660.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.50.Kj
75.50.Tt
75.60.Ch
75.60.Ej
75.30.Gw
85.70.-w
Opis:
The study presents magnetization process behaviour versus operating temperature up to 100°C in dual-phase ferromagnets in the light of their complex permeability spectra and energy losses from quasi-dc regime up to about 1 MHz upon defined peak induction. The samples consist of two Co- and Fe-based ball-milled-ribbon powders mixed in the same mass ratio. The magnetic characterization has been carried out by a digital hysteresisgraph-wattmeter using complex permeability approach to the linear material.
Temperature invoked reduction of anisotropy leads to the decrease of hysteresis losses and significantly affects the low-frequency part of permeability and losses that is ascribed to domain wall movement. The high-frequency behaviour remains unchanged with respect to increase of temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 696-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Frequency Core Losses Components of FeNiMo Powder Compacted Materials
Autorzy:
Olekšáková, D.
Kollár, P.
Füzer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030429.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Vv
85.70.-w
75.50.Bb
Opis:
The relations of core losses with the frequency of FeNiMo alloys were investigated. The core energy losses were determined by the measurements of dc and ac hysteresis loops as functions of frequency (1 Hz-50 Hz). The usual three-component concept of separation of core losses consisting of hysteresis, eddy current and anomalous losses was used to explain the influence of the powder particle size on core loss frequency dependences.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 639-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation of the Earth’s surface by local mass loading and uploading effects
Autorzy:
Mojzeš, M.
Kollar, P
Valko, M.
Powiązania:
https://bibliotekanauki.pl/articles/225088.pdf
Data publikacji:
2012
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
mass loading
compressibility of soil
elastic settlement of Earth's surface
masa załadunku
ściśliwość gruntu
elastyczne rozliczenie powierzchni Ziemi
Opis:
The mass of a building influences a deformation of the Earth’s surface up to long distance from area of realization. The elastic and rheological effects of settlement are modeled by different methods presented in the many scientific papers. More deeply knowledge of mechanical properties of materials and modern computer equipment allow construct very precisely model reaction of the Earth surface on loading effects in time. Geodesists and geophysicists need to know this laws of deformation and theirs time evolution for design of control geodetic networks and for analysis of repeated control measurements of horizontal and vertical time series. The presentation contents the mathematical modeling of the Earth elastic surface deformation caused by loading and unloading effects caused by a mass.
Źródło:
Reports on Geodesy; 2012, z. 1/92; 191-200
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring relative instances of exposure in equilibrium of migration processes based on population characteristics
Autorzy:
Pitlik, L.
Kollár, P.
Fülöp, Z.
Madarász, I.
Powiązania:
https://bibliotekanauki.pl/articles/1201242.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
similarity analysis
migration potential
sustainability
automation
objectivity
socio-cybernetics
Opis:
Cybernetic states of law try to plan each activity – especially migration issues. The planning process has the following question originating in socio-cybernetics in its core: Where can it be assumed that the population characteristics are higher/lower than rational? The planning levels can be different: from the continent or country levels via statistic regions or micro-regions to settlements (even at the street and house levels). Parallel to the aggregation like population density (or annual growth rate), models can also be developed for arbitrary layers of demographical statistics, like the required ratio of males and females in different age-groups and/or education categories, etc. The models can analyze time-periods (e.g., years, time intervals) to ensure that dynamic processes will not actually be covered through static evaluation. The necessary data asset (a kind of Big Data) is given by OECD/ EUROSTAT, for example The questions and data assets are well-known. The modeling methodology consists of potential know-how: through estimations of staircase functions in the framework of online similarity analyses, regional norm values can be derived for targeted population characteristics. Therefore, the European strategy concerning the integration of massive volumes of migrants can be supported in an objective way. Analogue analyses with the same methodology have already been derived for parts of Germany and Hungary. Similarity analysis is an artificial intelligence-based approach with its own consistence-oriented quality assurance layers. The data-driven policy creation needs methodologies where objectivity is provided through optimization in the modeling based on arbitrary phenomena. The modeling philosophy should try to ensure a kind of regional multi-layered equilibrium (sustainability, cf. Kazohinia). The outlined methodology can be seen as a sort of automated SWOT analysis where each conclusion will be derived from the raw statistics in a direct way – without the risk of human subjectivity intervening in the process. The modeling spectrum consists of three levels: (1) Explorative modeling is able to derive basic characteristics for ceteris paribus perspectives through the complex functions. The standard analytical potential works with ceteris paribus parameters, based on the appropriate literature sources. (2) Antidiscriminative modeling is capable of deriving ranks for objects without an actual learning pattern, for the so-called production functions. (3) A cybernetic state of law should be able to have robot-planning values supporting human decision processes. Therefore, 'freedom of press' is basically the capability to explore and publish objective force fields and not to catalyze the spread of subjective evaluations.
Źródło:
Managerial Economics; 2017, 18, 2; 183-199
1898-1143
Pojawia się w:
Managerial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft Magnetic Properties in Bulk Permalloy Alloys Fabricated by a Warm Consolidation
Autorzy:
FŰzer, J.
Kollár, P.
Olekšáková, D.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813525.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
Soft magnetic properties of bulk NiFe and NiFeMo alloys consolidated by hot compaction were studied. During annealing the compacts residual stresses diminish by relaxation and soft magnetic properties improve. The lowest coercivity of bulk NiFe and NiFeMo alloys are 11. 0 and 11. 2 A/m, respectively, while the total losses are 1. 81 and 1. 42 W/g at f=10 kHz and $B_\text{max}$ =0. 2 T.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 59-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Hot Pressed NiFe Powder
Autorzy:
Olekšáková, D.
Kollář, P.
Fűzer, J.
Kusý, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813529.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
The aim of this work is to investigate the structure and magnetic properties of compacted microcrystalline NiFe (81 wt. % of Ni) powder. Bulk samples were prepared by compaction of milled NiFe (81 wt. % of Ni) ribbon. We found that after compaction of the powder displacement of domain walls becomes more dominant and the coercivity decreases and is comparable with the coercivity of conventional permalloy. The coercivity of the bulk material before heat treatment is lower than that for powder and that is why we can assume that the magnetic "contact" is restored after compaction. Annealing of bulk samples reduces the losses due to the relaxation of internal stresses induced by milling and compaction.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 75-78
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DC Magnetic Properties of Amorphous Vitrovac Ribbon
Autorzy:
Kollár, P.
Birčáková, Z.
Füzer, J.
Kuźmiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031042.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Jk
75.60.Ch
75.60.Ej
Opis:
Soft magnetic amorphous Co-based materials prepared by rapid quenching method in the form of thin ribbon are well-known due to their excellent soft magnetic properties as high permeability, low coercivity, and low magnetic losses in kHz range. The amorphous Co-Fe-B-Si material Vitrovac® 6155 U55 produced by Vacuumschmelze GmbH & Co. KG belongs to this class of materials and was investigated in as-delivered state. The aim of this work was to study DC magnetization process by various experimental methods. We have measured magnetization curve by fluxmeter based hysteresis graph and hysteresis loops by three different fluxmeter based hysteresis graphs, exhibiting significant differences. The first and the second hysteresis graph perform the hysteresis loops measurement by the point-by-point method, either with commutative or with summing steps. The third one is AC hysteresis graph working at very low frequencies down to 7 mHz, performing the continuous method. The explanation of this result is based on the structural after effect influencing the domain wall displacement. We assumed that the domain structure consists of very small number of domain walls responsible for magnetization process, which was confirmed by the visualization of static domain structure by a computer-controlled setup based on the Kerr effect.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 675-677
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy
Autorzy:
Bednarcik, J.
Michalik, S.
Kollar, P.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1534068.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
61.05.cp
64.70.dg
75.30.Kz
Opis:
It follows from experimental observations that ball milling induces substantial changes in an amorphous $Co_{70.3}Fe_{4.7}Si_{10}B_{15}$ (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 825-826
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Film Thickness on the Microstructure and Magnetic Properties of Finemetic Thin Films
Autorzy:
Dlugoš, R.
Sovák, P.
Balcerski, J.
Füzer, J.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/2013050.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Jk
73.50.Jt
75.70.Ak
Opis:
The aim of this work was to study the influence of film thickness on the structure and magnetic properties of finemetic thin films after annealing. Thin films with the various thickness (from 20 nm up to 700 nm) were prepared by DC sputtering method. The heat treatments of the films for further structural and magnetic observations were performed at the temperature range 300-500°C for 15 min in vacuum furnace. Structural observations were carried out by transmission electron microscopy. Coercivity was determined from hysteresis loops traced with fluxmeter and Kerr magnetooptical hysteresisgraph. All the experimental results confirm a different magnetic behaviour of the thin films according to their thickness.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 447-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Crystalline NiFe Alloy Prepared by High-Energy Ball Milling and Compacting
Autorzy:
Olekšáková, D.
Kollár, P.
Füzer, J.
Bednarčík, J.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1533970.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Wk
75.50.Vv
75.60.Ej
75.60.-d
Opis:
The structure and magnetic properties of compacted microcrystalline NiFe (81 wt% of Ni) powder is investigated. The powder of NiFe alloy prepared by ball milling of ribbon (prepared by melt spinning) remains single phase material suitable for compaction in order to prepare soft magnetic material. The bulk samples were consolidated by uniaxial compaction of the powder in vacuum. By measuring of AC and DC magnetic properties it was found out that in bulk samples the displacement of domain walls is the dominant magnetization process, while rotation of magnetization vectors prevails in powder material.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 797-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Fe/$SiO_{2}$ Powder Composites Using Impregnation Method
Autorzy:
Kabátová, M.
Füzer, J.
Füzerová, J.
Dudrová, E.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367476.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
77.84.Lf
75.60.Ej
Opis:
Fe/$SiO_{2}$ powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of $SiO_{2}$ nanopowder were prepared in two ways, (i) by mixing the Fe/$SiO_{2}$ powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/$SiO_{2}$ components with shellac dissolved in ethanol and with thermoplast SL450. $SiO_{2}$ was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 134-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties οf Fe(Mn)-Si-B-Nb-Cu Alloys
Autorzy:
Michalik, S.
Sovak, P.
Bednarcik, J.
Kollar, P.
Girman, V.
Powiązania:
https://bibliotekanauki.pl/articles/1810612.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
75.50.Tt
77.80.Bh
Opis:
According to high energy X-ray diffraction measurements no significant changes were observed in a short range atomic order of amorphous ribbons $Fe_{73.5-x}Mn_xCu_1Nb_3Si_{13.5}B_9$ (x=1 up to 15 at.%). Thermal stability of the as-prepared alloys was investigated by differential scanning calorimetry and by in situ X-ray diffraction measurements. The two-step crystallization process was revealed, crystallization temperatures $T_{x1}$ and $T_{x2}$ were influenced by Mn content (thermal separation between $T_{x1}$ and $T_{x2}$ completely vanished for x=9). Nanocrystalline state of annealed samples was confirmed by electron transmission microscopy. The influence of Mn substitution on magnetic properties was confirmed by thermomagnetic measurements.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 399-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Preparation Methods on Magnetic Properties of Fe/SiO₂ Soft Magnetic Composites
Autorzy:
Füzerová, J.
Füzer, J.
Kollár, P.
Kabátová, M.
Dudrová, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032239.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
85.70.-w
81.05.Ni
Opis:
An analysis of several variants of the Fe/polymer/SiO₂ composites in terms of the impact of iron powder particle shape (irregular, spherical), of the content (0.4-2.0 wt%), of the polymer type (shellac, thermoset SL450) and the method of its application as well as the effect of the preparation procedure of the composites (mixing and/or vacuum-pressure impregnation) on properties of electrical insulating layer (thickness and coherence), electrical resistivity and magnetic properties was carried out. It was found that the main governing factor of the microstructure formation is the shape, surface microgeometry of the iron particles and the insulator layer. These determine not only the uniformity of thickness and cohesion of the insulating layer of the applied polymer or its hybrid modification (polymer+SiO₂ nanoparticles), but also the most suitable method of preparation in terms of the achieved values of electrical and magnetic properties of the composites.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 816-818
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Vitroperm Content on the Energy Losses in Composite Materials Based on the Mixture of Two Ferromagnets
Autorzy:
Birčáková, Z.
Kollár, P.
Vojtek, V.
Bureš, R.
Fáberová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1200792.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.60.Jk
75.60.-d
Opis:
Soft magnetic composites offer several advantages such as 3D isotropic magnetic properties and relatively small energy losses, finding use in electrical devices like electromotors, transformers or sensors. The aim of this work was to investigate the dc and ac magnetic properties of composites based on the mixture of two different ferromagnets: iron based material Somaloy® 700 and Vitroperm® 500 alloy. The analysis of total losses into dc losses, classical losses and excess losses showed that the classical and excess losses were negligibly small. The specific resistivity was increasing with the increasing fraction of Vitroperm (VPM). The coercivity exhibited maximum at 20% of VPM.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 114-115
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD
Autorzy:
Olekšáková, D.
Füzer, J.
Kollár, P.
Bednarčík, J.
Lathe, C.
Powiązania:
https://bibliotekanauki.pl/articles/1200812.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
61.05.cp
Opis:
The aim of the present work was to study the isothermal compression and isobaric thermal expansion behaviour of ball-milled NiFe (81 wt.% of Ni) and NiFeMo (79 wt.% of Ni, 16 wt.% of Fe) alloy and follow its phase evolution when exposed to high pressure and temperature. In-situ pressure-temperature energy dispersive X-ray (EDXRD) diffraction experiments were performed at the MAX80 instrument (beamline F2.1). The compressibility of NiFe alloy at 400 °C was evaluated for pressure values of up to 3.5 GPa. The EDXRD spectra revealed the presence of cubic FeNi_{3} phase as determined from the shift of (111), (200) and (220) reflection lines in corresponding EDXRD spectra.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 128-129
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 34

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