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    Wyświetlanie 1-7 z 7
    Tytuł:
    Positron Annihilation in Corroded Steels St20 and St3S
    Autorzy:
    Pietrzak, R.
    Smiatek, W.
    Szatanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047155.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.72.Cc
    82.45.Bb
    Opis:
    The paper deals with examining the lifetimes of positrons emitted from $\text{}^{22}$Na source in corroded St20 and St3S steels. Influence of the method of defecting the sample surfaces on the spectrum of positron lifetimes was investigated. Influence of temperature of initial annealing of samples, plastic deformation, electrolytic hydrogenation and corrosion in HCl vapors on trapping positrons in the examined steels was also determined.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 667-676
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Magnetic Field on Annihilation of Positrons in Corroded Steel St-20
    Autorzy:
    Pietrzak, R.
    Szatanik, R.
    Jaworska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047156.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.72.Cc
    82.45.Bb
    Opis:
    The positron lifetime in steel St-20 were determined before and following corrosion in HCl vapors. The influence of external magnetic field and remanent magnetization state on the parameters of the positron lifetime spectrum in the steel were investigated. It was found that the presence of magnetic field causes a decrease in the intensity of the component connected with annihilation of positrons in the close-to-the-surface lattice defects.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 677-681
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Lanthanides from Xerogels Embedded in Mesoporous Matrices
    Autorzy:
    Gaponenko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814047.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Fw
    83.80.Jx
    81.05.Rm
    78.55.Mb
    61.43.Gt
    82.45.Cc
    42.70.Qs
    78.55.Ap
    78.60.-b
    Opis:
    The report summarizes peculiarities of synthesis and luminescence properties of porous silicon, porous anodic alumina and artificial opals with the inclusions of sol-gel derived oxides (xerogels), doped with Er, Tb, and Eu. Origin of strong luminescence of lanthanides from xerogels in mesoporous matrices is discussed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 737-749
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Characterization and Statistical Properties of Two-Dimensional Granular Systems During the Compaction
    Autorzy:
    Živković, S.
    Jakšić, Z.
    Arsenović, D.
    Budinski-Petković, Lj.
    Vrhovac, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503325.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.70.-n
    45.70.Cc
    81.05.Rm
    61.43.Bn
    Opis:
    We study the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking, by numerical simulation. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second phase of the shake cycle is based on an efficient event-driven molecular-dynamics algorithm. We analyze the compaction dynamics for various values of the friction coefficient and the coefficient of normal restitution. The granular organization at local level was studied by analyzing the shape factor ξ of the local volumes, associated with a natural way of subdividing the volume into local parts - the Voronoi partition. It gives a clear physical picture of the competition between less and more ordered domains of particles during the compaction. We calculate the distribution of the shape-factor for packings at different stages of the compaction process. We have also investigated a two-dimensional granular medium experimentally. We prepared the granular packings of metallic cylinders of diameters 4, 5, and 6 mm. The distributions of the shape-factor obtained numerically for various tapping intensities are consistent with our experimental results.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 246-251
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of a Magnetic Field on the Formation of Corrosion Defects in Selected Metals and Steels, Analysed Using Positron Annihilation Method
    Autorzy:
    Pietrzak, R.
    Szatanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196102.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.72.Cc
    82.45.Bb
    Opis:
    The method of positron lifetime measurement was used to analyse the influence of a magnetic field on the kinetics of corrosion defect formation in near-surface layers of iron, titanium as well as S20 and S0H18N9 steel grades. The listed metals, which belong to ferro- and paramagnetic materials, have different sensitivity to corrosion. It was found that not only the presence of a magnetic field, but also its direction influence the dimensions and the concentration of defects formed during corrosion.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 733-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a Skid Type Landing Gear of a Rotary Wing UAV by Experimental and Numerical Methods
    Autorzy:
    Yildirim, O.
    Günay, E.
    Anil, Ö.
    Aygün, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401314.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    45.20.da
    45.50.Tn
    02.70.Dh
    04.80.Cc
    06.30.-k
    45.20.D
    Opis:
    The objective of this study was to analyze the results obtained from tests done by simulating the crash landing of a rotary wing unmanned air vehicle with a skid type landing gear. The experimental and computational methods were used in the simulation tests. In the first portion of the test; namely with the experimental method, the impact loads induced by the simulated crash landing and the stresses, strains, deformations generated by these loads, were recorded by drop test apparatus. In the second portion of the test with the computational method, free falling of the skid type landing gear was modeled and crash landing test was simulated numerically by using ANSYS code. Experimental methods were applied on four skid landing gear specimens with different shapes. Each of the test samples used in the following test was evolved because each sample was developed and redesigned based on the feedback results obtained from the former test.The first three test specimens were manufactured from 2024 T3, 7075 T6 and 6061 T6 aluminum alloys respectively and all of them were curved in Π-form with a solid cross section. The last and fourth specimen was also manufactured from 6061 T6 aluminum alloy and it was curved in a hollow semi-circle form (∩-form). It is concluded that the last and fourth developed specimen was the best in absorbing the impact energy and enduring the crash.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1170-1175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical determination of apparent mass variation of granular media confined in silo geometry
    Autorzy:
    Qadir, Abdul
    Ispalove, Nurlybek
    Ali, Asim
    Chand, R.
    Shah, M.
    Khan, Asif
    Hussain, Kashif
    Powiązania:
    https://bibliotekanauki.pl/articles/1070521.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    83.80.Fg
    45.70.Cc
    45.70.-n
    Opis:
    Granular materials have vast applications both in industry and in daily life. They display quite interesting and exceptional properties different from the other known forms of matter. To investigate the complex properties of particulate materials, experimental, analytical, and numerical techniques have been employed. In this paper the results of experimental and numerical tests of various grain sizes and coefficient of friction between granules and cylindrical walls on the mass measured at bottom of container, known as apparent mass, are reported. It is revealed that apparent mass augments with the grain size. Moreover, it is also found that the variation in apparent mass measurement is strongly dependent on bead diameter rather than the silo size. The results suggest that the conversion of vertical stresses into horizontal in silo is mainly due to the friction between the grain and system boundary than the arching phenomenon.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 378-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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