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Wyświetlanie 1-15 z 27
Tytuł:
Pressure Dependence of the Raman Frequencies of Ammonia Solid I near the Melting Point
Autorzy:
Yurtseven, H.
Powiązania:
https://bibliotekanauki.pl/articles/2025788.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
We calculated in this study the Raman frequencies of some lattice modes in the melting region of ammonia solid I. The Raman frequencies of those phonon modes were obtained through the Grüneisen relation using the volume data for the ammonia solid I from the literature. Our calculated Raman frequencies require for comparison the experimental Raman frequencies measured as a function of pressure for some fixed temperatures in the ammonia solid I.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 557-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane
Autorzy:
Yurtseven, H.
Cebeci, A.
Powiązania:
https://bibliotekanauki.pl/articles/1398881.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
64.70.Dv
Opis:
The pressure dependence of the Raman frequencies for the $ν_{21}$ mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter $γ_{T}$ in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 744-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nierównowaga finansów publicznych w wybranych państwach Europy Środkowo-Wschodniej
Public Finance Imbalance in Selected Cee Countries
Autorzy:
Szymańska, Agata
Powiązania:
https://bibliotekanauki.pl/articles/945536.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
H62
deficit
public debt
Treaty on the Functioning of the European Union
Stability and Growth Pact
deficyt
dług publiczny
Traktat o funkcjonowaniu Unii Europejskiej
Pakt stabilności i wzrostu
H63
Opis:
The aim of this article is to assess the public finance imbalance in selected CEE countries. The study examines public debt and deficit in six European Union Member States: Bulgaria, Croatia, the Czech Republic, Poland, Romania, and Hungary. The study revealed the growing imbalance in public finance in these countries, resulting mainly from the increased public debt. Moreover, the examined countries have problems with the implementation of supranational fiscal rule for budget balance, which resulted in the imposition of the Excessive Deficit Procedures.
Przedmiotem podjętych analiz jest ocena nierównowagi finansów publicznych w wybranych krajach Europy Środkowo-Wschodniej. W opracowaniu zbadano kształtowanie się długu publicznego oraz deficytu w sześciu państwach Unii Europejskiej: Bułgarii, Chorwacji, Czechach, Polsce, Rumunii oraz na Węgrzech. Przeprowadzone analizy wykazały, że w państwach tych narasta nierównowaga, wynikająca m.in. ze wzrostu zadłużenia publicznego. Ponadto poddane ocenie państwa wykazują problemy z realizacją reguły przewidzianej dla deficytu, co wpłynęło na nakładanie na nie procedur nadmiernego deficytu.
Źródło:
Gospodarka w Praktyce i Teorii; 2015, 4(41)
1429-3730
2450-095X
Pojawia się w:
Gospodarka w Praktyce i Teorii
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Crystal Structure Behaviour of Complex Yttrium Aluminium Oxides YAlO_3 and Y_3Al_5O_{12}
Autorzy:
Senyshyn, A.
Vasylechko, L.
Powiązania:
https://bibliotekanauki.pl/articles/1399474.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.05.F-
65.40.De
65.60.+a
63.70.+h
Opis:
Crystal structures of two yttrium aluminium oxides, namely $YAlO_3$ and $Y_3Al_5O_{12}$, were investigated in the temperature range 3.4-300 K by high-resolution neutron powder diffraction. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Thermal expansion of yttrium aluminium oxides was evaluated in terms of 1st order Grüneisen approximation, where the Debye temperatures and the Grüneisen parameters have been estimated for both compositions. Anomalies in the thermal expansion of yttrium aluminium perovskite have been observed and modelled using the Einstein oscillator with negative Grüneisen parameter. Extended bond length analysis revealed significant thermally-driven modifications of the aluminium-oxygen framework.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 329-335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of titanium alloy modified with a-C:N:H and a-SiCxNY(H) coatings on adhesion and immune response of human osteoblast-like MG-63 cells
Autorzy:
Ścisłowska-Czarnecka, A.
Menaszek, E.
Kołaczkowska, E.
Januś, M.
Stypuła, B.
Powiązania:
https://bibliotekanauki.pl/articles/284995.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
titanium alloy
a-C:N:H and a-SiCxNy(H) coatings
osteoblast-like MG-63 cells
cell adhesion
cytokines
Opis:
The study was conducted in order to determine the effects of modified titanium alloy (Ti-6Al-4V) surfaces on the biological response of a human osteoblast-like cell line. MG-63 cells were cultured on disk-shaped Ti-alloys: unmodified, and covered with a-C:N:H or a-SiCxNy(H) layers. Interactions between materials and cells were examined through determination of cells adhesion and secretion of cytokines involved in the development of immune response.
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 126-128
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometry of the $\text{}^4T_{2g}$ Excited State in $Cs_2SiF_6:Mn^{4+}$
Autorzy:
Reisz, A.
Avram, C.
Powiązania:
https://bibliotekanauki.pl/articles/1815472.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ej
63.20.Kr
63.70.+h
Opis:
The aim of this paper is to calculate the equilibrium displacements of the $\text{}^4T_{2g}$ potential surface minimum from the ground state along the $a_{1g}$ and $e_g$ Jahn-Teller active modes for the octahedral $[MnF_6]^{2-}$ cluster obtained by doping $Mn^{4+}$ ions in $Cs_2SiF_6$ host crystal. The equilibrium displacements in normal and Cartesian coordinates were estimated from force constants of $[MnF_6]^{2-}$ cluster and Huang-Rhys factors associated with the Jahn-Teller stabilization energy. A net equatorial expansion and an axial stretching of the geometry of the $[MnF_6]_{2-}$ cluster in first $\text{}^4T_{2g}$ excited state, as combined effect of the $a_{1g}$ and $e_g$ displacements, were demonstrated.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 829-833
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and X-Ray Photoelectron Spectra of YNi$\text{}_{4}$B Compound
Autorzy:
Pugaczowa-Michalska, M.
Chełkowska, G.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036993.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
82.80.Pv
71.20.-b
63.70.+h
Opis:
The electronic structure of the ternary YNi$\text{}_{4}$B compound, crystallizing in the hexagonal CeCo$\text{}_{4}$B structure (P6/ mmm space group), was studied by X-ray photoelectron spectroscopy and ab initio calculations. Core levels and the valence band were investigated. The X-ray photoelectron spectroscopy valence band is compared with that obtained from ab initio calculations. The valence band spectrum at the Fermi level exhibits the domination of the Ni(3d) states, which are hybridized with 4d states of Y and 2p states of B. The theoretical electronic specific heat coefficientγ derived from N(E$\text{}_{F}$) is about 11.33 mJ/(mol K$\text{}^{2}$) for experimental lattice parameters. The calculated bulk modulus is B$\text{}_{0}$=1.61632 Mbar.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 487-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Resistivity of the Monoatomic Metallic Layer
Autorzy:
Paja, A.
Działo, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400157.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
73.50.Bk
73.63.-b
73.63.Hs
Opis:
We present new formula which describes the change of electrical resistivity of a monoatomic metallic layer with temperature. The results are compared with those given by the Bloch-Grüneisen formula for bulk metals. Our calculated values compared with those for bulk materials are significantly higher at low temperatures (T<0.1θ) and apparently lower at the remaining range of temperatures. Both effects can be explained by the low dimensionality of the sample.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 770-772
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport and Spin Scattering in Very Thin Disordered Metallic Films
Autorzy:
Paja, A.
Spisak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1814037.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Cz
72.25.Ba
73.50.-h
73.63.-b
Opis:
We consider the electron transport through a very thin disordered metallic film doped with magnetic impurities. We treat the film as a quasi-two-Łinebreak -dimensional system with structural disorder where some ions have spins and other are spinless. The interaction of conduction electrons with localized spins is described by means of the exchange term of the Hamiltonian. The scattering is treated in the first Born approximation and the potential is assumed to be the Coulomb screened one. The total effective cross-section is calculated as a sum of the part responsible for the potential scattering and the second part which comes from the spin-spin scattering. The Fermi sphere splits into separate sheets due to the finite size of the system in the z direction, therefore, the cross-section and the relaxation time are calculated for each sheet independently. The total transport relaxation time and the conductivity are obtained as functions of the thickness of the system and the contents of magnetic impurities. Some model calculations have been made for a thin disordered film of copper doped with manganese.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1289-1295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Effects on the Electrical Resistivity of the Ultra-Thin Metallic Film
Autorzy:
Paja, A.
Działo, A.
Powiązania:
https://bibliotekanauki.pl/articles/1198662.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
73.50.Bk
73.63.-b
73.63.Hs
Opis:
In this article we investigate the electron-phonon interaction in metals in the system strongly reduced in one dimension. The Fermi sphere which represents the free-electron structure of a bulk metal was replaced by a discrete set of the Fermi disks. Using the variational expression for resistivity the temperature and film thickness dependences of the resistivity were derived and compared with experimental data.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1220-1223
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Displacive Phase Transformations and Generalized Stacking Faults
Autorzy:
Paidar, V.
Ostapovets, A.
Hardouin Duparc, O.
Khalfallah, O.
Powiązania:
https://bibliotekanauki.pl/articles/1418492.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
The displacive phase transformations can be considered as composed of two processes, namely, pure displacements, shuffling or shearing of atomic planes, and supplementary homogeneous lattice deformation changing also the dimensions of the moving planes. Such deformation causes shape memory effect when the structural transformation is reversed. General displacements of atomic planes will be examined, i.e. γ-surface type calculations will be reported for single plane shuffling, alternate shuffling of every other bcc atomic plane and successive displacements of parallel atomic planes producing in combination with homogeneous deformation the close packed structures. The results of calculations using the many-body potentials of the Finnis-Sinclair type will be compared with ab initio calculations that indicate in which way the phase transformation can be initiated.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 490-492
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological Model of Austenite-Martensite Interfaces in Cu-Al-Ni Alloy
Autorzy:
Ostapovets, A.
Zarubova, N.
Paidar, V.
Powiązania:
https://bibliotekanauki.pl/articles/1418493.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
Discussion of the austenite-single-variant martensite interfaces in Cu-Al-Ni alloy is performed in the frame of a topological model of martensite interfaces. This model takes into account admissible defects lying in the interface. The results are compared with the experimental data obtained on the foils of Cu-Al-Ni alloys deformed in situ in a transmission electron microscope.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 493-496
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$TiO_2$ Nanotube Array as Efficient Transparent Photoanode in Dye-Sensitized Solar Cell with High Electron Lifetime
Autorzy:
Lamberti, A.
Sacco, A.
Hidalgo, D.
Bianco, S.
Manfredi, D.
Quaglio, M.
Tresso, E.
Pirri, C.
Powiązania:
https://bibliotekanauki.pl/articles/1399940.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Bd
72.20.Jv
72.40.+w
73.40.Mr
88.40.H-
81.07.De
Opis:
In the present work, the fabrication and characterization of non-curling, free-standing $TiO_2$ nanotube membranes and their integration in front-side illuminated dye-sensitized solar cells are reported. Vertically oriented $TiO_2$ nanotube arrays were fabricated by anodic oxidation of a titanium foil. Nanotube membranes were detached from the metallic foil, transferred and bonded on transparent fluorine-doped tin oxide/glass substrates employing a $TiO_2$ sol as a binder. Crystalline phase and morphology of the film were investigated, evidencing the formation of a highly ordered 1D nanotubes carpet, with a pure anatase crystalline structure. $TiO_2$ nanotube-based DSCs were fabricated using reversible microfluidic architecture. The cell performances were studied by I-V electrical characterization, incident-photon-to-electron conversion efficiency, electrochemical impedance spectroscopy and open circuit voltage decay measurements, showing an increase in electron lifetime compared to nanoparticle-based dye-sensitized solar cells.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 376-379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inelastic X-Ray Scattering Studies of Phonon Dispersion in PbTe and (Pb,Cd)Te Solid Solution
Autorzy:
Kuna, R.
Minikayev, R.
Trzyna, M.
Gas, K.
Bosak, A.
Szczerbakow, A.
Petit, S.
Łażewski, J.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1398584.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.D-
68.43.-h
68.49.Sf
Opis:
PbTe and its solid solution (Pb,Cd)Te containing 2% of CdTe and PbTe grown by self-selecting vapour growth technique were investigated by inelastic X-ray scattering using synchrotron radiation. The ID28 beamline at ESRF with the incident photon energy of 17794 eV and the energy resolution of 3 meV was applied for that purpose. The measurements were performed at room temperature along [001]-type high symmetry direction in the Brillouin zone. In spite of a very low energy of phonon branches they can be determined by inelastic X-ray scattering with a high accuracy. The transversal acoustic phonon dispersion obtained by inelastic X-ray scattering corresponds well to those resulting from inelastic neutron scattering measurements and ab initio calculations. Apart from expected structures corresponding to the bulk phonons an additional scattering related to the crystal surface properties was observed in the inelastic X-ray scattering spectra. The analysis performed with the use of secondary ion mass spectroscopy technique demonstrated a presence of a thin oxide layer at sample surfaces.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1251-1254
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetite Fe$\text{}_{3}$O$\text{}_{4}$: the Correlated Electron-Phonon System
Autorzy:
Kozłowski, A.
Kąkol, Z.
Tarnawski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047312.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
75.40.-s
63.20.Kr
71.30.+h
75.30.Cr
Opis:
In the paper the influence of magnetic as well as electron-lattice interactions on the Verwey transition in magnetite related compounds is discussed based on the authors' experimental activity and available literature. While magnetism was proved to only reflect the transition, the results of nuclear inelastic scattering show that lattice dynamics actively participates in it. The studies of diffuse neutron scattering and heat capacity suggest also that the low temperature lattice properties of slightly doped magnetite are distinct from those with higher dopant concentration. Finally, recent theoretical results strongly suggest that the Verwey transition in magnetite cannot be understood and described without strong involvement of electron-lattice interactions.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 537-547
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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