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Wyszukujesz frazę "81.05.Tp" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Radial Distribution Function Analysis of Carbon Nanotubes
Autorzy:
Szczygielska, A.
Jabłońska, A.
Burian, A.
Dore, J. C.
Honkimaki, V.
Nagy, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/2014446.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
81.05.Tp
Opis:
Wide-angle X-ray scattering studies of carbon nanotubes produced by catalytic decomposition of acetylene on a supported Co catalyst are reported. The X-ray intensities were recorded up to maximum scattering vector K$\text{}_{max}$=24Å and then Fourier transformed to real space. Yielding the radial distribution functions of good spatial resolution were analysed by the model based on fitting procedures method. Detailed analysis of the experimental data by a least-squares fitting procedure shows that the local atomic structure exhibits the expected hexagonal network with the nearest-neighbour C-C distance of 1.41Å. Investigation of stacking nature of subsequent layers suggests the structure in which adjacent layers are arranged without spatial correlations with inter-tubule spacing of about 3.4Å.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 611-617
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of Adsorption of Metallic Particles on Graphite Substrate Via Molecular Dynamics Simulation
Autorzy:
Rafii-Tabar, H.
Powiązania:
https://bibliotekanauki.pl/articles/1968758.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Cb
07.05.Tp
68.55.-a
81.05.Tp
Opis:
A computer-based numerical modelling of the adsorption process of gas phase metallic particles on the surface of a graphite substrate has been performed via the application of molecular dynamics simulation method. The simulation relates to an extensive STM-based experiment performed in this field, and reproduces part of the experimental results. Both two-body and many-body inter-atomic potentials have been employed. A Morse-type potential describing the metal-carbon interactions at the interface was specifically formulated for this modelling. Intercalation of silver in graphite has been observed as well as the correct alignments of monomers, dimers and two-dimensional islands on the surface.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 343-354
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of La-Doped $TiO_2$ Nanopowders by Raman Spectroscopy
Autorzy:
Šćepanović, M.
Aškrabić, S.
Berec, V.
Golubović, A.
Dohčević-Mitrović, Z.
Kremenović, A.
Popović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1808047.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Wx
78.30.-j
07.05.Tp
Opis:
Titanium dioxide $(TiO_2)$ nanopowders doped with 0.65, 1, 2, 3 and 4 wt.% of lanthanum ions $(La^{3+})$ were synthesized by sol-gel technology. Dependence of structural and morphological characteristics of nanopowders on $La^{3+}$ content and synthesis conditions is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of $TiO_2$. Additional Raman modes of extremely low intensity can be related to the presence of certain amount of highly disordered brookite phase in nanopowders. Dependence of the intensity ratio of the Raman modes which originate from anatase and brookite on doping conditions is specially analyzed. In order to estimate the variation of nanocrystallite size with dopant content, shift and asymmetrical broadening of the most intensive $E_g$ Raman mode of anatase are analyzed by phonon confinement model. The obtained results are compared with the results of X-ray diffraction spectroscopy. Special attention is dedicated to the changes in the Raman spectra of pure and La-doped $TiO_2$ nanopowders observed after high temperature treatment.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 771-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital Fabrication of Mathematical Models via Low-Cost 3D FDM Desktop Printer
Autorzy:
Gür, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1401922.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.50.H-
02.60.Cb
07.05.Tp
81.20.Hy
Opis:
Additive manufacturing technology is developed throughout the 1980's and 1990's. This technology makes the realization of mathematical models much easier. The challenge focused is here to fabricate real objects from very complex mathematical models by using a low-cost 3D fused deposition modeling desktop printer. Thus this brings the intangible mathematical expressions to life. In this study it is illustrated that complex mathematical expressions are not only numbers and symbols but also they are real life objects. In the examples, some mathematical functions such as Möbius strip, Schwartz functions and their boundary conditions are introduced and then digitally fabricated. This work shows that how complex functional mathematical models that cannot be manufactured with classical engineering methods or very difficult to produce can be fabricated by using a 3D FDM desktop printer.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-100-B-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials
Autorzy:
Grujić-Brojčin, M.
Šćepanović, M.
Dohcević-Mitrović, Z.
Popović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1807810.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
78.30.-j
63.22.-m
07.05.Tp
Opis:
The simulation of the Raman spectra of nanostructured materials, where the effects of frequency shift and asymmetric broadening of the Raman modes play an important role, can be very useful in systematic characterization of these materials. Use of phonon confinement model for calculating Raman spectra of different nanomaterials is considered both from the viewpoint of different confinement function and the confinement strength, as well as the dimensionality of the confinement model. The phonon dispersion relations and the choice of their approximation are also studied. The influence of particle size distribution on the shape of the calculated spectra is discussed and contributions of Gaussian and asymmetric Gaussian distribution are compared. The effects of average and inhomogeneous strain on the behavior of simulated Raman spectra are also discussed. The results of the phonon confinement model are compared to the experimental spectra of $CeO_2$ and anatase $TiO_2$ nanopowders.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 51-54
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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