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    Wyświetlanie 1-7 z 7
    Tytuł:
    Energy Spectrum in Quantum Dots of Lead and Tin Chalcogenides Semiconducting Compounds
    Autorzy:
    Dugaev, V. K.
    Litvinov, V. I.
    Petrov, P. P.
    Mironov, O. A.
    Nashchekina, O. N.
    Oszwałdowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1923782.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.50.+t
    71.90.+q
    Opis:
    The energy spectrum of a quantum dot made from IV-VI narrow gap semiconductors is studied. The calculations of the energy levels as functions of the dot radius are performed. When the anisotropy of the bare energy spectrum is strong, the energy levels are calculated using Fal'kovskii's adiabatic approximation for multiband systems. When the quantum dot material has an inverted band gap with respect to the host, the low-energy states within the fundamental gap are shown to arise.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 797-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation with Core Electrons in 3d-Transition Metals
    Autorzy:
    Baranowski, A.
    Dębowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933461.pdf
    Data publikacji:
    1995-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    78.70.Bj
    71.90.+q
    Opis:
    Recently we have been able to resolve the rare gas core contribution in long-slit angular correlation of annihilation radiation curves for some d-metals when applying a new model to fit the experimental data. In the present paper the model is applied to angular correlation of annihilation radiation spectra for the whole series of the 3d-transition metals from Sc to Cu. The model corresponds to recent theoretical predictions for the metals from the second half of the series and allows one to find the contribution of the core electrons to the whole annihilation process for these metals. Probably a different description of the angular correlation of annihilation radiation data for the metals from the beginning of the 3d-series should be searched.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 1; 13-19
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in Pd-Ag-H and Pd-Au-H Systems
    Autorzy:
    Dębowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928991.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.25.Pi
    71.90.+q
    Opis:
    Positron annihilation method was used to study hydrogenated Pd$\text{}_{1-y}$Ag$\text{}_{y}$, and Pd$\text{}_{1-y}$Ag$\text{}_{y}$ alloys in α-phase. In both systems, insensitivity of the low-lying core states to the presence of hydrogen in the alloy was found. Rigid band mode1 appeared to be a useless description of the changes in the band occupation after hydrogen absorption. The results seem to indicate that the "capacity" of the low-lying H-Pd bonding states remains constant when the Ag or Au atoms are added to PdH$\text{}_{≈0.6}$, which can explain the existence of the limit to the summed up hydrogen and Ag(Au) concentration.Zatwie
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 287-292
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Electronic Density in C$\text{}_{60}$ by Compton Scattering
    Autorzy:
    Bellin, Ch.
    Marangolo, M.
    Moscovici, J.
    Loupias, G.
    Rabii, S.
    Erwin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963336.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Ck
    61.46.+w
    71.90.+q
    Opis:
    High-resolution measurements of Compton profiles on C$\text{}_{60}$ as well as K$\text{}_{x}$ C$\text{}_{60}$ have been carried out using 16 keV photons at LURE (Orsay, France) and at ESRF (Grenoble, France). Theoretical profiles are obtained using the plane wave expansion of wave functions from an ab-initio self-consistent field calculation of the energy band-structure. The linear combination of atomic orbitals method within the local-density-approximation has been employed for the calculation. In all cases, the agreement between theory and experiment is excellent. The C$\text{}_{60}$ profiles indicate substantially greater delocalization of the ground-state charge density, compared to graphite. We have demonstrated, both by experiment and calculation, that the delocalization in C$\text{}_{60}$ is mainly a molecular effect.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 681-687
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Gap Calculations of Ternary $InN_{0.03125}P_{0.96875}$ Alloy
    Autorzy:
    Ustundag, M.
    Yalcin, B.
    Bagci, S.
    Aslan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401943.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ak
    71.15.Mb
    03.75.Hh
    71.90.+q
    Opis:
    In the current study, structural and electronic properties of ternary dilute nitride $InN_{x}P_{1-x}$ alloys have been investigated by using density functional theory. The equilibrium lattice parameter of studied material has been calculated in zinc-blende phase. 2× 2× 2 supercell with 64 atoms has been used for calculations. The lattice parameter of $InN_{0.03125}P_{0.96875}$ alloy is found to be 5.852 Å. By means of the equilibrium lattice parameter, electronic band structure has been calculated for dilute 3.125% nitride composition. It is found that a ternary $InN_{0.03125}P_{0.96875}$ alloy is a direct band gap semiconductor with energy band gap of 1.198 eV.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-135-B-137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Gap Characterization of Ternary $BBi_{1-x}N_{x}$ Alloys: A First-Principles Study
    Autorzy:
    Yalcin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402512.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ak
    71.15.Mb
    03.75.Hh
    71.90.+q
    Opis:
    III-V based alloys and heterostructures have got much attention due to their great device applications as well as for the development of electronic, optic and optoelectronic devices. Because of this reason, the present study reports an investigation about the band gap properties of $BBi_{1-x}N_{x}$ (0 ≤ x ≤ 1) ternary alloy in zinc-blende phase. The results of studied binary (BN and BBi) and ternary $BBi_{1-x}N_{x}$ alloy structures are presented by means of density functional theory within the Wu-Cohen exchange correlation potential based on generalized gradient approximation. We have implemented geometric optimization before the volume optimization calculations for all studied alloys structure. The obtained equilibrium lattice constants of studied binary compounds are in coincidence with experimental works. The band gap character (direct/indirect or negative) of ternary $BBi_{1-x}N_{x}$ alloys is also investigated.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-46-B-48
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Electronic Properties of Ternary $Al_x In_{1-x}P$ Alloys
    Autorzy:
    Bagci, S.
    Yalcin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402552.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ak
    71.15.Mb
    03.75.Hh
    71.90.+q
    Opis:
    III-V based alloys and heterostructures have much attention due to their great device applications as well as for the development of electronic, optic and optoelectronic devices. Because of this reason, the present study reports an investigation of the structural optimization of ternary alloys $Al_x In_{1-x}P$. Method of WIEN2k code is applied considering Wu-Cohen correlation energy functional based on density functional theory. We have constructed 1× 1× 1 supercell containing 8 atoms in zinc-blende structure. For all studied alloys structure, we have implemented geometric optimization before the volume optimization calculations. In this work, the structural and electronic properties of ternary alloys $Al_x In_{1-x}P$ are presented. The obtained equilibrium lattice constants of studied binary compounds are more compatible with experimental data compared to standard semilocal (LDA-PBE) calculations.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-97-B-99
    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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