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Wyświetlanie 1-15 z 90
Tytuł:
Parametric Phonon-Helicon Interaction in Centrosymmetric Crystals with Strain-Dependent Dielectric Constant
Autorzy:
Artemenko, O. L.
Sevruk, B. B.
Powiązania:
https://bibliotekanauki.pl/articles/1945729.pdf
Data publikacji:
1996-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kr
Opis:
The process of interaction between circularly polarized coherent transverse phonons and slow electrokinetic waves in the centrosymmetric crystal placed in a longitudinal magnetic field and possessing strong strain dependence of the dielectric constant caused by the electrostriction is considered. The cut-off system of equations for the process of nonlinear four-wave interaction in crystal with a quadratic electrostriction corresponding to direct energy conversion from helicon to acoustic wave is derived. The solution is sought for numerically in the vicinity of a synchronism point determined by the intersection of helicon and phonon dispersion curves at different values of semiconductor plasma parameters. The results show the possibility of effective phonon parametric amplification in semiconductor crystal with the electroinduced elastic anisotropy.
Źródło:
Acta Physica Polonica A; 1996, 90, 3; 531-539
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Systematic Variation of Optical Properties of Alkali Halides: an Ab Initio Study
Autorzy:
Gonçalves, G. C.
Lalic, M. V.
Malta, O. L.
Powiązania:
https://bibliotekanauki.pl/articles/2047877.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Dg
78.20.Ci
Opis:
In this paper we study a correlation between the optical properties, electronic structure and anion-cation electronegativity difference in three groups of alkali halides MX (M = Li, Na, K; X = F, Cl, Br, I). The electronic structure was calculated by first-principle, density-functional theory based full-potential linear augmented plane wave method. Then the complex dielectric function was computed, allowing determination of the optical absorption spectra in all compounds, up to incident radiation energy of 40 eV. The results were interpreted in terms of calculated band structures and correlated with the electronegativity difference in each compound, which was estimated on the basis of topological theory of Bader.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1043-1048
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angle-Resolved UV Photoemission from Single Crystals of AgPd Alloys
Autorzy:
Ilver, L.
Nilsson, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/1924334.pdf
Data publikacji:
1993-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Gs
71.25.Pi
Opis:
The angular dependence of photoemission energy distributions were measured from single crystal, substitutional disordered alloys Ag$\text{}_{x}$Pd$\text{}_{1-x}$ with x = 0.97 and x = 0.90. The random hybridization between the Ag 5sp band and the Pd 4d state is discussed in terms of complex energies.
Źródło:
Acta Physica Polonica A; 1993, 83, 1; 125-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Carburizing by Valorization of Organic Waste
Autorzy:
Boutessouna, B.
Allaoui, O.
Allaoui, L.
Powiązania:
https://bibliotekanauki.pl/articles/1031860.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.-b
89.60.-k
Opis:
The organic waste recycling problem remains an important economic issue for the industry, where much research is done in this area. In this study, we are interested in the enhancement of some organic waste from slaughterhouses (blood and horns) with two objectives: recycling wastes and producing cheap cement for surface carburizing. The waste is converted into coal and added to an activator to produce a solid medium, witch can be used for surface carburizing of carbon steels. Preparation of waste and physical and chemical carbonating of blood and horns resulted in production of coal, that was used as an effective carbon source for cementation treatment. Comparison of the obtained results with other works on carburizing treatment, using industrial solid mixtures, has shown that carburizing layers in both cases are very similar. Indeed, metallographic analysis, X-ray diffraction and Vickers hardness testing of obtained layers have led to results very similar to those in literature.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1173-1175
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot-Phonon Decided Carrier Velocity in AlInN/GaN Based Two-Dimensional Channels
Autorzy:
Ardaravičius, L.
Kiprijanovič, O.
Liberis, J.
Powiązania:
https://bibliotekanauki.pl/articles/1506207.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Fq
73.40.Kp
Opis:
Nanosecond-pulsed measurements of hot-electron transport were performed for a nominally undoped two-dimensional channel confined in a slightly strained $Al_{0.8}In_{0.2}N$/AlN/GaN and nearly lattice matched $Al_{0.84}In_{0.16}N$/AlN/GaN heterostructures at room temperature. No current saturation is reached because we minimized the effect of the Joule heating. The electron drift velocity is deduced under assumption of uniform electric field and field-independent electron density. The estimated drift velocity ≈ 1.5 × $10^7$ cm/s at 140 kV/cm bodes well with the value of hot-phonon lifetime exceeding 0.1 ps.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 231-233
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground-State Properties of the Spin-1/2 Heisenberg-Ising Bond Alternating Chain with Dzyaloshinskii-Moriya Interaction
Autorzy:
Strečka, J.
Gálisová, L.
Derzhko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1506983.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.50.+q
05.70.Jk
64.60.De
75.10.Pq
Opis:
Ground-state energy is exactly calculated for the spin-1/2 Heisenberg-Ising bond alternating chain with the Dzyaloshinskii-Moriya interaction. Under certain condition, which relates a strength of the Ising, Heisenberg and Dzyaloshinskii-Moriya interactions, the ground-state energy exhibits an interesting nonanalytic behavior accompanied with a gapless excitation spectrum.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 742-744
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectra of Wideband Dipole Radiation Induced by the Photomagnetoelectric Response in Narrow Gap Semiconductors
Autorzy:
Kiprijanovič, O.
Shatkovskis, E.
Kiprijanovič, L.
Powiązania:
https://bibliotekanauki.pl/articles/1812040.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
71.55.Gs
75.50.Pp
Opis:
The frequency spectra of sign inverted photomagnetoelectric responses in narrow gap semiconductors InSb, InAs, and $Cd_{0.2}Hg_{0.8}Te$, excited by nanosecond laser light pulses, were used for calculation of induced electromagnetic radiation frequency spectra in dipole approximation. The parallelepiped shape sample was considered as capacitor-like point dipole. The known Fourier transform property was used in calculations. Features of double sign inverted signals formation and its spectra are considered and compared with experimental results. The radiation of pulses, having spectra in terahertz range when excited by picosecond laser pulse from capacitor-like radiators that demonstrate double sign inverted photoresponses, is expected.
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 761-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Magnetic Behaviour of $Ho_3Cu_4X_4$ Compounds (X = Si and Sn)
Autorzy:
Gondek, Ł.
Szytuła, A.
Prokhnenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1813174.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
75.50.Ee
75.40.Cx
Opis:
Ternary $Ho_3Cu_4X_4$ compounds exhibit very complex magnetic phase diagrams. The rare earth ions occupy two non-equivalent crystal positions. Within both magnetic sublattices, magnetic moments exhibit different magnetic ordering temperatures. Moreover, in light of our results, it seems that both sublattices are weakly coupled between each other. This may be observed as independent changes of propagation vectors etc. The major difference of ordering temperatures between both compounds is likely related to substantial change of interatomic distances. Consequently, completely different crystalline electric field effects are observed.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1179-1184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalence of Mechanical and Magnetic Force in Magnetic Shape Memory Effect
Autorzy:
Kopecký, V.
Perevertov, O.
Straka, L.
Ševčík, M.
Heczko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1402147.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
75.78.Fg
75.50.Cc
75.70.Cn
75.60.Ej
62.20.D-
Opis:
High mobility of twin boundary is crucial for magnetic shape memory effect. The twin boundary can be moved by applied magnetic field or mechanical stress. In Ni-Mn-Ga 10M martensite there are two different, field movable, a-c twin boundaries type I and II due to monoclinic lattice. For single twin boundary of both types we experimentally evaluated the equivalence of magnetic and mechanical force and the validity of generally used energy model using direct stress-strain and magnetization measurements. For type II, highly mobile twin boundary, the equivalence seems to be valid and model broadly agrees with measurement. However, for type I the calculated magnetic stress is much larger than mechanical stress needed for twin boundary motion.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 754-757
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nodal Domains in Chaotic Microwave Rough Billiards with and without Ray-Splitting Properties
Autorzy:
Hul, O.
Savytskyy, N.
Tymoshchuk, O.
Bauch, S.
Sirko, L.
Powiązania:
https://bibliotekanauki.pl/articles/2044609.pdf
Data publikacji:
2006-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Mt
05.45.Df
Opis:
We study experimentally nodal domains of wave functions (electric field distributions) lying in the regime of Breit-Wigner ergodicity in the chaotic microwave half-circular ray-splitting rough billiard. Using the rough billiard without ray-splitting properties we also study the wave functions lying in the regime of Shnirelman ergodicity. The wave functions Ψ$\text{}_{N}$ of the ray-splitting billiard were measured up to the level number N=204. In the case of the rough billiard without ray-splitting properties, the wave functions were measured up to N=435. We show that in the regime of Breit-Wigner ergodicity most of wave functions are delocalized in the n, l basis. In the regime of Shnirelman ergodicity wave functions are homogeneously distributed over the whole energy surface. For such wave functions, lying both in the regimes of Breit-Wigner and Shnirelman ergodicity, the dependence of the number of nodal domains Ɲ$\text{}_{N}$ on the level number N was found. We show that in the regimes of Breit-Wigner and Shnirelman ergodicity least squares fits of the experimental data reveal the numbers of nodal domains that in the asymptotic limit N→∞ coincide within the error limits with the theoretical predictionƝ$\text{}_{N}$/N≃ 0.062. Finally, we demonstrate that the signed area distribution Σ$\text{}_{A}$ can be used as a useful criterion of quantum chaos.
Źródło:
Acta Physica Polonica A; 2006, 109, 1; 73-87
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Erbium Lithium Niobium Gallium Garnet
Autorzy:
Toma, O.
Gheorghe, L.
Vlaicu, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491286.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
78.55.Hx
Opis:
The synthesis of a new garnet, $Er_3Li_{0.275}Nb_{0.275}Ga_{4.45}O_{12}$ (ErLNGG), by solid-state reaction, is reported. A comparison of the fluorescence spectra of $Er^{3+}$ in ErLNGG, Er-doped (0.1 at.%) calcium lithium niobium gallium garnet (CLNGG), and Er(50 at.%):CLNGG is presented. The narrowing of luminescence lines suggests an ordering of the partially disordered CLNGG with the increase of erbium concentration.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 193-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electric Field and Temperature Dependence of Conductance of Two-Dimensional Electron Gas in AlGaN/AlN/GaN
Autorzy:
Ardaravičius, L.
Kiprijanovič, O.
Liberis, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813392.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
73.40.Kp
73.50.Fq
Opis:
The two-dimensional gas in AlGaN/AlN/GaN heterostucture with a very thin (0.6 nm) AlN spacer was investigated by conductivity relaxation measurements in 86-300 K temperature range. The results show the presence of two exponential relaxation processes characterized by different characteristic time constants. Parameters of the fast and slow components of the processes differently depend on the electric field and temperature. The fast process is attributed to influence of the electric field on the barrier formed by the spacer, while the slow process is attributed to the hot-electron capture out of the channel followed by electron thermal release.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1001-1004
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃
Autorzy:
Novosad, S.
Novosad, I.
Bordun, O.
Kostyk, L.
Bordun, I.
Tuzyak, O.
Powiązania:
https://bibliotekanauki.pl/articles/1029724.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.60.Kn
78.70.En
Opis:
In this work the researched results of the spectral characteristics of the luminescence and the thermostimulated luminescence curves of Y₂O₃ and Y₂O₃:Eu ceramic materials at the X-ray excitation in the 85-295 K range were generalized. Considering the features of Y₂O₃ crystal structure and the possibility of the formation of the short-lived and stable hole and electron centers of V- and F-type by the ionizing radiation X-ray luminescence spectrum of ceramics at 85 K is fitted into the elementary Gaussian shape bands with the maxima near 3.40, 3.06, 2.67, 2.33, 2.09, and 1.91 eV. The main 3.40 and 3.06 eV bands of the luminescence are caused by the self-trapped excitons of (YO₆)⁹¯ complex, when the cation is localized in the field of the trigonal (C_{3i}) and monoclinic (C₂) symmetries. The emission at 2.67 eV and the weak bands in the 1.65-2.61 eV region are considered as the radiation of excitons localized on the anion vacancies and the electron centers of F-type (F⁺, F and F¯). The thermoluminescence of Y₂O₃ in the 186 and 204 K main peaks range is connected with the thermal destruction of the self-trapped states of O¯ ions that located in the field of the trigonal and monoclinic symmetries. The activator bands caused by ⁵D→ ⁷F_{j} electronic transitions in Eu³⁺ are only observed in the X-ray and thermostimulated luminescence spectra of Y₂O₃:Eu ceramics. It was assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y₂O₃:Eu sample the energy goes to Eu³⁺ through (Eu²⁺O¯) complexes (states) of the charge transfer.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 806-810
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ORR Electrocatalysis on Cr³⁺, Fe²⁺, Co²⁺-Doped Manganese(IV) Oxides
Autorzy:
Sokolsky, G.
Zudina, L.
Boldyrev, E.
Miroshnikov, O.
Gauk, N.
Kiporenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030872.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.72.-y
85.40.Ry
Opis:
The ionic dopant additives have different mechanisms of their influence upon MnO₂ electrocrystallisation process and depending on dopants added the following polymorphs are stabilised: α -MnO₂ (hollandite, I4/m) - NH₄⁺; γ -MnO₂ (ramsdellite, Pbnm) - Co²⁺, Fe²⁺; layered polymorph δ -MnO₂ (birnessite, C2/m) - Cr³⁺. The defect states of intergrowth method in ramsdellite matrix and twinning, OH groups studied by X-ray diffraction and the Fourier transform infrared mtehod, respectively, indicate their high content in case of Fe²⁺ and Co²⁺-doped manganese dioxide. CVA oxygen reduction reaction peaks were established after experiments in alkaline electrolytes and dioxygen (argon, air) atmosphere. Activity of doped samples studied is comparable with other published data. Both doped with Co²⁺ and Fe²⁺ samples display maximal currents and some distinctive features in oxygen reduction reaction.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1097-1102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deterministic Periodical and Quasiperiodical Surfaces of III-V Compounds: Preparation, Investigations and Applications
Autorzy:
Dmitruk, N. L.
Mayeva, O. I.
Yastrubchak, O. B.
Beketov, G. V.
Powiązania:
https://bibliotekanauki.pl/articles/1969052.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Bs
73.40.Ns
78.30.Fs
Opis:
Autocorrelation functions for rough (random, quasiperiodical and deterministicperiodical) surfaces are deduced from the surface profiles determined by using the line-by-line analysis of atomic force microscopy images. It is shown that the initial parts of autocorrelation functions have a Gaussian form. An attempt to use the concept of fractal as a bridge between deterministic periodic and random (spontaneous) surfaces including quasiperiodic ones have been made.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 285-290
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 90

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