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    Wyświetlanie 1-9 z 9
    Tytuł:
    Topographic and Energetic Heterogeneity Studies of Oxidized Graphite Surface by Scanning Tunneling Microscopy/Spectroscopy and Photoelectron Spectroscopy
    Autorzy:
    Klusek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963284.pdf
    Data publikacji:
    1997-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    71.20.-b
    Opis:
    Scanning tunneling microscopy and spectroscopy and X-ray photoelectron spectroscopy are used to study oxidation effects of nitric acid on a highly-oriented pyrolytic graphite surface. Various etching times at constant temperature are applied in order to create local binding sites on the surface without creating deep defects. A single and paired chains structure, different from pure graphite at atomic scale, is shown by scanning tunneling microscopy. This can be explained by the presence of oxygenate groups on the surface, revealed by X-ray photoelectron spectroscopy. Both scanning tunneling spectroscopy and X-ray photoelectron spectroscopy demonstrate the vanishing of π bands characteristic of sp$\text{}^{2}$ graphite hybridization. This, in turn, can be explained by dehybridization related to new bondings of the graphite carbons in the oxygenate groups. An important result of area averaging spectroscopy is the observed energetic heterogeneity considered in terms of the changes of local electronic density of states of the oxidized surface.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 3; 569-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine Interaction Parameters in $Fe_{28}Al_{72}:$ $\text{}^{57}Fe$ Mössbauer Spectroscopy and Ab Initio Study
    Autorzy:
    Hanc, A.
    Deniszczyk, J.
    Kansy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427489.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    61.05.Qr
    71.20.-b
    Opis:
    The paper discusses a theoretical model that associates the shape of the Mössbauer spectrum with the configuration of atoms in local surroundings of the Mössbauer nuclide. Using the model we analyse the Mössbauer spectra of $Fe_{72}Al_{28}$ alloys after various heat treatments. Basing on the model calculations the hyperfine structure parameters describing an effect of an Al atom in the first and the second coordination shell of $\text{}^{57}Fe$ atom are evaluated. Using these parameters the values of hyperfine magnetic field and isomers shift for the atomic configurations present in stoichiometric $Fe_3Al$ are estimated and compared with the results of ab initio calculations.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1154-1155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scanning Tunneling Microscopy/Spectroscopy Investigations of the Interference Effects Caused by the Circular Pits on the Thermally Oxidized graphite Surface
    Autorzy:
    Klusek, Z.
    Kalinowski, M. W.
    Olejniczak, W.
    Kobierski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968772.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.60.Fy
    61.16.Ch
    71.20.-b
    Opis:
    The thermal oxidation of the graphite leads to the removal of monoatomic carbon layers from the surface and formation of circular pits on the exposed plane. Near the pit edges the scanning tunneling spectroscopy measurements show a series of very narrow flat regions on the I/V characteristics. The observed I/V flat regions appear only when the characteristic is recorded very close to the pit edges. The appearance of tunneling current steps can be explained by the oscillating character of the local density of states near the pit edges. A simple quantum mechanical model in 2D based on boundary condition for an electron wave function is proposed.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 415-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Electronic Structure of Zn$\text{}_{1-x}$Mg$\text{}_{x}$ Mixed Crystals by Compton Spectroscopy Method
    Autorzy:
    Reniewicz, H.
    Andrejczuk, A.
    Dobrzyński, L.
    Rećko, K.
    Waliszewski, J.
    Żukowski, E.
    Firszt, F.
    Łęgowski, S.
    Męczyńska, H.
    Szatkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952072.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.45.-d
    61.80.Ed
    71.55.Gs
    Opis:
    The first experimental study of the Compton profiles of Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se for x=0.25, 0.47, 0.56 mixed crystals is presented. The Compton profiles were measured with the use of the $\text{}^{241}$Am radioactive source with a resolution of 0.57 a.u. The experimentally obtained Compton profiles were compared with the theoretical ones based on the free-atom model. The results are interpreted in terms of outermost electrons of Zn and Mg being promoted to the higher momentum states, and 4p-electrons of Se becoming more delocalised in a solid, being thus promoted to the lower momentum states.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 907-910
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic and Electronic Properties of $OsB_2$ from First-Principles Calculations
    Autorzy:
    Cheng, Y.
    Yang, J.
    Wang, Y.
    Ji, G.
    Chen, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365243.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    61.50.Ks
    67.25.de
    71.20.-b
    Opis:
    The pressure induced phase transitions of $OsB_2$ from the orthorhombic structure (Orth) to the hexagonal structure (Hex) is investigated by using ab initio plane-wave pseudopotential density functional theory, together with quasi-harmonic Debye model. We find that the pressure-induced phase transition occurs at 2.8 GPa and 12.5 GPa by local density approximation and general gradient approximation, respectively. It is predicted that $OsB_2$ has no phase transition temperature from the Orth structure to the Hex structure. Moreover, the dependences of the relative volume V/$V_0$ on the pressure, thermal expansion coefficient α on the pressure and temperature are also successfully obtained. The electronic properties including energy band, total and partial density of states and electron density difference for two structures are also analyzed. The Mulliken charges and Bond populations for both Orth and Hex structures are also obtained.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1186-1190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The optoelectronic properties of Sb doped BBi compounds
    Autorzy:
    Ustundag, M.
    Yalcin, B.
    Aslan, M.
    Bagcı, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065716.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    78.20.Ci
    71.20.-b
    61.72.Vv
    Opis:
    We have determined structural, electronic and optical properties of BBi_{1-x}Sb_x alloy by using density functional theory based on the full potential linearized augmented plane wave method. For the exchange correlation potential, the generalized gradient approximation of Perdew, Burke, and Ernzerhof has been performed. The structural properties, including lattice constants and bulk modulus have been calculated by changing x concentration. We have investigated the effect of composition on lattice constant, bulk modulus and band gap. Properly, direct/indirect band character of BBi_{1-x}Sb_x has been investigated depending on the x concentration. Then we have determined some basic linear optical properties BBi_{1-x}Sb_x alloy in direct band gap region. The obtained results have been compared with available studies. All the calculations have been performed after geometry optimization. As far as we know, no experimental or theoretical data are presently available for the studied ternary alloy BBi_{1-x}Sb_x (0 < x < 1).
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 98-100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of the adiabatic potential of a symmetric molecule in the vicinity of charged semiconductor surface
    Autorzy:
    Bercha, S.
    Glukhov, K.
    Kharkhalis, L.
    Sznajder, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1157162.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.70.Ej
    61.50.Ah
    02.20.-a
    Opis:
    We present a description of the symmetry-based method for the construction of the adiabatic potential of a symmetric molecule near the charged semiconductor surface. For this purpose, a transformation of the adiabatic potential of a free high symmetric molecule (D_{3d}) in the presence of uniform electric field is investigated. The obtained adiabatic potential is analyzed with respect to the stability of molecule in the vicinity of charged surface, as a dependence of its orientation in the electric field.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-120-A-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curie Temperature and Density of States at the Fermi Level for Al-Cu-Fe Phases: β-Solid State Solution-Approximants-Icosahedral Quasicrystals
    Autorzy:
    Shalaeva, E.
    Prekul, A.
    Shchegolikhina, N.
    Medvedeva, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373475.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    71.23.Ft
    71.20.-b
    61.66.Dk
    Opis:
    A consistent reduction in the absolute value of the negative paramagnetic Curie temperature was found in a series of Al-Cu-Fe phases: β(CsCl)-solid state solution, noncanonical approximant (η-AlCu(Fe) phase), rational approximants (P1+P2-pentagonal phases) and icosahedral quasicrystal. For these Al-Cu-Fe phases, the decrease in the Curie temperature correlates with a reduction of the density of states at the Fermi level which was estimated from the low-temperature heat capacity measurements and first-principles calculations. The observed correlation was related to the antiferromagnetic indirect exchange interaction (Ruderman-Kittel-Kasuya-Yosida interaction) between the localized magnetic moments on Fe induced by the intrinsic structural defects in the Al-Cu-Fe phases. The weakening of Fe 3d-Al s, p hybridization owing to the intrinsic structural defects such as vacancies, antisite defects and distortions of coordination polyhedrons is suggested to be the main mechanism of appearance of localized magnetic moments on Fe atoms.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 572-576
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Energies of Interaction of Point Defects with Interfaces and Grain Boundaries
    Autorzy:
    Vasseur, J.O.
    Deymier, P.A.
    Akjouj, A.
    Dobrzynski, L.
    Djafari-Rouhani, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892209.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    73.40.-c
    61.70.Yq
    68.35.Dv
    Opis:
    The electronic energies of interaction of a point defect with interfaces and grain boundaries are calculated, as a function of the distance x$\text{}_{03}$ between the point defect and the corresponding planar defect. These interaction energies are shown to have the same type of oscillations as the corresponding local electronic densities. Therefore the electronic interactions more significantly affect the energy of segregation of point defects towards interfaces when x$\text{}_{03}$ is in the near vicinity of these interfaces, while at large distances the contribution of elastic interactions can dominate.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 39-46
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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