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Wyświetlanie 1-15 z 42
Tytuł:
Study of Misfit Dislocations Profiles in ZnSe/GaAs Structures by Raman Scattering
Autorzy:
Bała, W.
Drozdowski, M.
Kozielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929718.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Hv
Opis:
In this paper we present the Raman scattering measurements of the ZnSe epilayers grown on (001) GaAs substrate by molecular beam epitaxy method. We have studied dependence of the frequency shift of LO(ZnSe) mode in the Raman spectra vs. thickness of the ZnSe layer. The intensity of LO(ZnSe)/LO(GaAs) ratio vs. orientation angle α of the E vector of the exciting light on the ZnSe/GaAs interface relatively to the sample orientation is presented too.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 689-692
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental data of research using ground-penetrating radar "Zond-12c" and interpretation of georadarograms
Autorzy:
Iskakov, K.
Boranbayev, S.
Alimbayeva, Z.
Issin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1065642.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Fj
01.50.hv
Opis:
The paper presents engineering methods for the interpretation of georadarograms. For this purpose experimental research using ground-penetrating radar "Zond-12c" were carried out, in which artificial objects, placed in the training laboratory ground, were studied. The aim of the research is the geophysical investigation of the structure of lower layers and presence of artificial objects for obtaining of analogy georadarograms. The experiments allow developing of technology for the interpretation of real ground-penetrating radar data from unknown objects. Experiments also allow us to solve the inverse problem of determining the geoelectric properties of environments [S.I. Kabanihin, K.T. Iskakov, M.A. Bektemesov, M.A. Shishlenin, Algorithms and numerical methods for the solution of inverse and ill-posed problems, Astana 2011 (in Russian)]. Application of ground-penetrating radar in restoring of the structure of the underground environment can be reduced to the solution of ill-posed problems for hyperbolic and parabolic types of equations. Many researchers describe algorithms for this kind of problems. At present, methods of interpretation of georadarograms can be improved by new achievements of the inverse problems theory. The bottleneck of application of the ground-penetrating radar is the complexity of interpreted data, requiring at the present stage to attract highly qualified professionals. Forming of own methods of interpreting ground-penetrating radar data contributes to preservation of confidential geophysical information.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 322-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Harmonic generation analyses of memristor with different barriers and neuron
Autorzy:
Babacan, Y.
Kacar, F.
Powiązania:
https://bibliotekanauki.pl/articles/1068338.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.40.Bh
85.25.Hv
Opis:
We investigated the Fourier transform of memristor with various barriers and neuristor. To provide the different barriers we present a simple adaptive model dependent on input signal. We saw that there was no significant change of the harmonics with increasing barriers. Neurons provide an energy and area efficient and could be used in neuromorphic circuits. We used a neuron circuit that can be efficient to provide second and higher harmonics. Neuron circuit generates various spike shapes like regular spike, fast spike, initial bursting, chattering, etc. In this paper we analysed the Fourier transform of the most common spike shapes. The neuron or neuristor can be more efficient to generate second and higher harmonics compared to the other standard circuits.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 226-227
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Methodology to Disambiguate Privacy
Autorzy:
Alhalafi, D.
Powiązania:
https://bibliotekanauki.pl/articles/1402373.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.50.hv
89.20.Ff
Opis:
This paper addresses the pragmatic and semantic meaning of the term privacy by establishing a new method methodology of proceeding pragmatic, semantic and conceptual or combinations instances of privacy in relation to technology. The analysis of construct definition based on information published in the literature, for example Dictionaries are investigated under various conditions, for example semiotics. The new hybrid-privacy method is lexica-technical that investigates chronological definition of terms in relation to technology in distributed systems (DS); the method also looks at the impact of technological advancement on a particular innovation, polythematic or progress in pragmatic, semantic and conceptual characteristics of perception of privacy. The method's use is verified in an analysis of the unique meanings that underlie the term's usage both as a single word and in combination such as privacy law, privacy attack, privacy breach, and so forth. Literal (denotative) definitions and metaphoric (connotative) associations are examined to explain the use of privacy to refer to a physical entity and/or a mental representation, conceptual and perception. The method is also tentatively grounded in the disciplines of philology, cognition, information technology, and the philosophy of science. The lexica-technical analysis method is applied to the meanings of privacy starting with its original usage in the twenty first century and culminating with the definitions used by authors, IT developers and peoples in this paper. Finally, the paper aims at proposing a pragmatic, semantic and conceptual framework for measuring privacy. In this, technically introducing an extra button on the keyboard to indicate; whatever typed next is private to establish new link between cognition and neuron-computation systems.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-319-B-323
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation of Optical Vibrations in Zn$\text{}_{3}$P$\text{}_{2}$
Autorzy:
Misiewicz, J.
Wrobel, J. M.
Clayman, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/1887203.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.-e
78.30.Hv
Opis:
Reflectivity and transmittivity spectra of Zn$\text{}_{3}$P$\text{}_{2}$ in the far infrared region were measured at several temperatures. Raman scattering spectra at 295 K were also measured. Results of these measurements were interpreted in terms of one-phonon and multi-phonon transitions.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 405-409
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Strains at ZnSe/GaAs Interfaces by Raman Scattering
Autorzy:
Bała, W.
Drozdowski, M.
Kozielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1891888.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Hv
61.70.Wp
Opis:
Investigations of the strains at the n-ZnSe epilayers grown on GaAs substrate using polarized Raman spectra are presented. It has been shown that Raman scattering experiment can be used as a method for investigation of the splitting between the heavy- and light-hole bands in n-ZnSe thin films.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 723-730
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence, Reflectivity and Raman Investigations of Nanocrystallites in Luminescent Porous Silicon
Autorzy:
Bała, W.
Głowacki, G.
Łukasiak, Z.
Drozdowski, M.
Kozielski, M.
Nossarzewska-Orłowska, E.
Brzozowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1876076.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Hv
78.66.-w
Opis:
Raman scattering, reflectivity and photoluminescence measurements of the porous silicon layers prepared on (001) p/p$\text{}^{+}$ silicon epitaxial wafers by anodization method are presented. We have studied dependence of the frequency shift and halfwidth of LO mode in Raman spectra and shift of the luminescence peak in photoluminescence spectra vs. anodization conditions.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 445-448
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roughness Method to Estimate Fractal Dimension
Autorzy:
Błachowski, A.
Ruebenbauer, K.
Powiązania:
https://bibliotekanauki.pl/articles/1808085.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Df
61.43.Hv
Opis:
A method based on the pattern roughness was introduced for determination of the fractal dimension and tested for fractals like the Sierpiński carpet, the Sierpiński triangle, standard Cantor set, the Menger sponge and the Sierpiński tetrahedron. It was tested for non-fractal pattern like two- and four-dimensional gray scale random dust as well. It was found that for all these patterns the Hausdorff dimension is reproduced with relatively high accuracy. Roughness method is based on simple, fast and easy to implement algorithm applicable in any topological dimension. It is particularly suited for patterns being composed of the hierarchy of structures having the same topological dimension as the space embedding them. It is applicable to "fuzzy" patterns with overlapping structures, where other methods are useless. It is designed for pixelized structures, the latter structures resulting as typical experimental data sets.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 636-640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fracton Excitations in the Magnetic "Net Fractal" Systems
Autorzy:
Bąk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1813878.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Hv
75.30.Ds
Opis:
A localized spin system of fractal symmetry and Heisenberg exchange between nearest neighbors is considered. We define a specific class of fractals: "net fractals" and prove that in the logarithmic scale they are isomorphic with some bulk crystals. Further, with the use of logarithmic coordinates we show that the "net fractal" magnetic fractons can be presented as the conventional magnons.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 541-544
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exciton Electroluminescence of ZnSe/ZnO Structures under Biaxial Stress
Autorzy:
Bała, W.
Firszt, F.
Łęgowski, S.
Męczyńska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1924234.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Hv
61.70.Wp
Opis:
The strained ZnSe/ZnO structures grown on (111) ZnSe crystals by plasma oxidation was investigated by electro- and photoluminescence methods. The lines of heavy and light hole excitons under biaxial compressive stress are measured as a function of the temperature.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 896-899
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RKKY-Reminiscent Interaction in Net Fractals
Autorzy:
Jaroszewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1810564.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Hv
75.30.Hx
Opis:
We define a specific class of fractals as "net fractals" and prove that in the logarithmic scale they are isomorphic with some bulk crystals. Furthermore, with the use of logarithmic coordinates, we prove that in the "net fractal" magnetic system the indirect exchange, by itinerant electrons can be presented in the form that is reminiscent of the Ruderman-Kittel-Kasuya-Yosida interaction characteristic of a system of fractional spectral dimension.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 329-331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Vuv Lasing with Neon-Like Aluminum Ions
Autorzy:
Rahmani, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968879.pdf
Data publikacji:
1998-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Lt
52.20.Hv
Opis:
The collisional-radiative equilibrium model has been developed in order to investigate the population inversion on aluminum plasma. The population inversion has been established between lower 3s ($\text{}^{3}$P$\text{}_{1}^{0}$,$\text{}^{1}$P$\text{}_{1}^{0}$) and upper 3p ($\text{}^{3}$P$\text{}_{0}$,$\text{}^{1}$S$\text{}_{0}$) levels. The vacuum ultra-violet lasing on neon-like aluminum ions provides wavelengths of 111.9 nm, 143.2 nm, 157.3 nm. The rate of relative density population, between lower 3s $\text{}^{1}$P$\text{}_{1}^{0}$ and upper 3p $\text{}^{3}$P$\text{}_{0}$ levels, reaches its highest value of 7.16 at the electron density of 10$\text{}^{19}$ cm$\text{}^{-3}$. The modified expression of optical escape factor, in the case of Doppler profile, was introduced in the calculation of opacity effect on the gain magnitudes. The resonance radiation trapping by 3d configuration alters drastically the gain values. A gain greater than 1 cm$\text{}^{-1}$ was found between lasing levels 3s $\text{}^{3}$P$\text{}_{1}^{0}$ and 3p $\text{}^{3}$P$\text{}_{0}$. The enhancement of gain was due to the pumping of the upper level by dielectronic recombination process from the ground state of fluorine-like and by the inner-shell ionization process from excited levels of sodium-like ions.
Źródło:
Acta Physica Polonica A; 1998, 93, 4; 631-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of the Band Bending in ZnSe-GaAs Heterojunctions by Raman Scattering
Autorzy:
Bała, W.
Drozdowski, M.
Kozielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1879935.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Hv
61.70.Wp
Opis:
The band bending effect at the ZnSe-GaAs interface Was studied by means of Raman scattering induced by electric-field related to longitudinal-optical (LO) phonons. It has been shown that the variation of the band bending in GaAs can be modifled by changes in the electron concentration of ZnSe epilayer and the variation of the sample temperature.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 225-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Free Carrier Concentration on Nonlinear Absorption of n-Type ZnSe Crystals
Autorzy:
Sahraoui, B.
Chevalier, R.
Nguyen Phu, X.
Rivoire, G.
Bała, W.
Powiązania:
https://bibliotekanauki.pl/articles/1952689.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Jq
78.30.Hv
Opis:
The dependence of nonlinear absorption at 532 nm of n-type ZnSe crystals upon annealing temperature and free carrier concentration is reported. The nonlinear optical absorption as well as the efficiency of degenerate four wave mixing of ZnSe are investigated. It is found that the magnitude of the nonlinear absorption decreases with an increase in the electron concentration. The nonlinear refractive index change is estimated.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1070-1074
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S$\text{}_{2}$- and T$\text{}_{1}$-States
Autorzy:
Szymański, M.
Balicki, M.
Binkowski, M.
Kubicki, J.
Maciejewski, A.
Pawłowska, E.
Wróżowa, T.
Powiązania:
https://bibliotekanauki.pl/articles/1945389.pdf
Data publikacji:
1996-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
33.50.Hv
35.80.Be
Opis:
Spectral and photophysical properties of a few aromatic thioketones in their S$\text{}_{2}$- and T$\text{}_{1}$-states, in particular those determined by their interactions with solvents, are discussed. The reasons for a drastically different behaviour of thioketones in interactions with benzene as well as saturated hydrocarbons and perfluoroalkanes are analysed in more detail. Results of the time-resolved transient absorption measurements in the pico- and nanosecond time scale are given. An analysis of these results proves that a product of the decay of the S$\text{}_{2}$-state of xanthione in benzene is a new transient (τ $\text{}_{1}\text{}_{/}\text{}_{e}$ ≥ 60 ps) individuum which, regarding the system properties and the conditions of the experiment, has been identified as an exciplex in S$\text{}_{2}$-state formed as a result of an efficient interaction with benzene molecule. Also in xanthione//alkane systems the involvement of a transient individuum was proved. Most probably, this individuum was a thioketyl radical which could be formed by hydrogen abstraction from a hydrocarbon molecule by xanthione in the S$\text{}_{2}$-state. Such individua act as intermediates in passing excitation to the triplet states of thioketones and are effective channels of the S$\text{}_{2}$-state decay. The changes observed in the transient absorption spectra of xanthione in C$\text{}_{6}$H$\text{}_{6}$ in the time range of 10$\text{}^{-7}$-10$\text{}^{-6}$ s can be attributed to the formation of an excimer in the T$\text{}_{1}$-state as a result of the T$\text{}_{1}$-state selfquenching.
Źródło:
Acta Physica Polonica A; 1996, 89, 4; 527-546
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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