Autor: Szymczyk, Ł. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Current-Induced Spin Accumulation and Spin Transfer Torque in a Néel Domain Wall
Autorzy:: Baláž, P.
Szymczyk, Ł.
Dugaev, V.
Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1427608.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Ch
75.70.Cn
Opis:: Current-induced spin accumulation in a domain wall and the associated spin torque exerted on the wall are analyzed theoretically. The considerations are limited to a relatively thick Néel domain wall in a bulk ferromagnetic metal. The current-induced spin density is calculated using the linear response theory and the Green function formalism.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1210-1212
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Friction coefficient determination based on the results of ball – on - flat test
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Prasek, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/248003.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: friction coefficient
ball-on-flat test
FFT
Opis:: The interaction of contacting surfaces in relative motion is basic for every engineering design. The transmission of load from one rubbing surface to its mating surface under conditions of dry contact is taken into account. Microlocal or global models of friction are used to describe this phenomenon. In global approach, frictional force is proportional to normal load. A coefficient of external friction depends on the type, shape, and precision of finishing the surfaces of mating elements. The aim of the paper is analysis of a friction coefficient for 2024T3 aluminium alloy during cyclic tangential loading. Experimental tests are carried out on a ball-on-flat wear-testing machine Ducom. Tests of reciprocating friction are carried out using the following friction pairs of specimens: the ball specimen is made of high strength aluminium alloy PA25 and the plane specimen is made of 2024T3 alloy. Finally, graphs of temporary friction coefficients versus time in the form of fluctuated periodical functions are obtained. Two phases of friction are detected. However, during the first stage, the friction coefficient is relatively small while in the second period it rapidly increases and tends to become more irregular. Static and dynamic friction coefficients are estimated. In order to determine the dynamic coefficient the Discrete Fourier Transformation is used. The calculation of the dominant amplitude (corresponding to test frequency) of the studied functions is possible due to this method. An increase of the friction coefficient with an increase of normal load is observed. A cladding layer also causes an increase of friction, especially in the second phase.
Źródło:: Journal of KONES; 2012, 19, 1; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Interaction of nitrogen atoms in expanded austenite formed in pure iron by intense nitrogen plasma pulses
Autorzy:: Piekoszewski, J.
Sartowska, B.
Waliś, L.
Werner, Z.
Kopcewicz, M.
Prokert, F.
Stanisławski, J.
Kalinowska, J.
Szymczyk, W.
Powiązania:: https://bibliotekanauki.pl/articles/147989.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: alfa-to-gamma phase transformation in iron
expanded austenite
intense nitrogen plasma pulses
Opis:: The paper presents the results of experiments on modification of pure iron by high-intensity nitrogen pulsed-plasma treatment. The duration of nitrogen plasma pulses is approximately 1 mi s, and the energy density amounts to about 5 J/cm2. Such pulses are capable to melt the surface layer of the substrate (1- 2 mi m) and to introduce a significant concentration of nitrogen into the molten layer. Nuclear reaction analysis (NRA), X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS) were used for characterisation of the treated samples. The main results of the data analysis are as follows: it has been stated that such treatment leads to gradual transformation of initial alfa-phase into austenitic gamma structure in which expanded austenite gammaN is present. Treatment with 20 pulses results in almost complete transformation and introduces a retained dose of nitrogen estimated as 5.5 × 1017 N/cm2. The susceptibility for expansion of the lattice transformed to austenite in this way is smaller than in the case when the steel subjected to conventional nitriding is originally of austenite type. The analysis of the ratio of alfa to gammaN as a function of the nitrogen content provides a firm evidence that strong repulsion forces act between the first and the second nearest-neighbour nitrogen atoms in the fcc austenitic structure formed as a result of nitriding of pure iron by intense nitrogen plasma pulses.
Źródło:: Nukleonika; 2004, 49, 2; 57-60
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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