Temat: K22 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Structure and Energetics of Fragments of the Planar α and β Boron Sheets
Autorzy:: Gonzalez Szwacki, N.
Tarkowski, T.
Majewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1398547.pdf
Data publikacji:: 2016-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.-w
68.65.-k
73.22.-f
Opis:: Large scale first principles calculations based on density functional theory and using hybrid exchange-correlation functionals have been performed in order to study the structural properties and the relative stability of fragments of the planar α and β boron sheets. Based on the considered structures, we show that, in contrast to the fragments of the α -sheet, all the fragments of the β -sheet, having more than ≈30 atoms, are fully planar regardless of their shape. We conclude that the β -sheet is the only planar boron sheet reported so far that retains planarity even if it is reduced to relatively small fragments.
Źródło:: Acta Physica Polonica A; 2016, 129, 1a; A-148-A-149
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Surface Electronic Properties of Fe Nanoparticles on c(2×2)-N/Cu(001)
Autorzy:: Getzlaff, M.
Bode, M.
Wiesendanger, R.
Powiązania:: https://bibliotekanauki.pl/articles/2036899.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.37.Ef
68.55.Ac
68.65.-k
73.22.Dj
81.15.Kk
Opis:: We prepared nanoscaled particles consisting of ferromagnetic material on a nanostructured template. This nanolithographic procedure allows to fabricate high-density magnetic nanodots in a highly ordered way. For this purpose, Fe particles were grown on the c(2×2)-N/Cu(001) surface which exhibits a checkerboard-like structure. Scanning tunneling spectroscopic measurements demonstrate that the electronic properties of the areas with deposited material are identical to clean copper. Fe nanoparticles on the reconstructed patches show a significantly different electronic behavior. These observations directly hint to a covering of iron with copper on the clean surface.
Źródło:: Acta Physica Polonica A; 2003, 104, 3-4; 327-335
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Molecular Dynamics in Cyclic Olefin Copolymer
Autorzy:: Makrocka-Rydzyk, M.
Orozbaev, B.
Nowaczyk, G.
Głowinkowski, S.
Jurga, S.
Powiązania:: https://bibliotekanauki.pl/articles/2043644.pdf
Data publikacji:: 2005-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 36.20.Ey
76.60.-k
77.22.Gm
83.85.Vb
82.35.Jk
Opis:: Nuclear magnetic resonance, broadband dielectric spectroscopy and dynamic-mechanical thermal analysis were employed to study molecular dynamics of ethylene-norbornene copolymer. The analysis of experimental data indicates existence of three motional processes denoted as αβ, andγ in order of decreasing temperature. Theα relaxation is related to the dynamic glass transition, while the β relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. Theγ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible forγ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to α transition, indicating cooperative nature of the motion.
Źródło:: Acta Physica Polonica A; 2005, 108, 2; 385-393
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Coupling between Electronic and Vibrational Excitations in Carbon Nanotubes Filled with $C_{60}$ Fullerenes
Autorzy:: Utko, P.
Ferone, R.
Krive, I.
Shekhter, R.
Jonson, M.
Monthioux, M.
Noé, L.
Nygård, J.
Powiązania:: https://bibliotekanauki.pl/articles/1492807.pdf
Data publikacji:: 2011-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Fg
73.63.Kv
73.23.Hk
73.22.Lp
71.38.-k
Opis:: We investigate the low-temperature electron transport through $C_{60}$ peapods, which are carbon nanotubes encapsulating $C_{60}$ fullerenes. We find that the temperature dependence of the Coulomb blockade oscillations in peapod quantum dots deviates from conventional Breit-Wigner behavior, showing signatures of the Franck-Condon blockade of conductance. This indicates the presence of a coupling between electronic states and vibrational excitations. Unlike for suspended empty nanotubes, these are not intrinsic vibrational modes of the tube but mechanical vibrations of the encapsulated fullerenes that affect the electronic transport. Fullerene peapods thus emerge as a new class of nanoelectromechanical systems.
Źródło:: Acta Physica Polonica A; 2011, 120, 5; 839-841
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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