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Wyświetlanie 1-15 z 564
Tytuł:
Dynamics of the Belief Propagation for the Ising Model
Autorzy:
Siudem, G.
Świątek, G.
Powiązania:
https://bibliotekanauki.pl/articles/1388282.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.10.-a
05.45.-a
89.65.-s
Opis:
The Belief Propagation algorithm is a popular technique of solving inference problems for different graph-like structures. We present a discussion of the dynamics of that algorithm for the Ising model on the square lattice. Our main goal was to describe limit fixed points for that algorithm, which are strictly connected with the marginal probabilities and stationary points of the Bethe Free Energy. Analytical considerations provide an exact analysis of a class of symmetrical points while numerical simulations confirm that for small lattices there are no non-symmetrical points. Notwithstanding the prevalent use of the Belief Propagation as an inference tool we present a sociophysical interpretation of its dynamics. In that case our considerations may be viewed as an investigation of the possible fixed points of the social dynamics.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-145-A-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Roughness and Relaxation behaviour of MBE Grown ZnSe/GaAs
Autorzy:
Buda, B.
Leifeld, O.
Völlmeke, S.
Schmilgus, F.
As, D. J.
Schikora, D.
Lischka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1952466.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
Opis:
We investigated the GaAs/ZnSe interface and the influence of the Ga$\text{}_{2}$Se$\text{}_{3}$ formation at the GaAs/ZnSe interface on the relaxation of the ZnSe epilayer using reflection high-energy electron diffraction, atomic force microscope, photoluminescence, and X-ray diffraction techniques. An improvement of the surface roughness due to the cleaning of the GaAs substrate with hydrogen excited in a plasma source and a higher critical thickness of GaAs(001)/ZnSe due to the suppression of Ga$\text{}_{2}$Se$\text{}_{3}$ at the surface was observed.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 997-1001
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Surface Orientation of the Substrate on the Saturation State of Solution during Liquid Phase Heteroepitaxy
Autorzy:
Olchowik, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1921670.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
Opis:
Orientation effects during heteroepitaxy appear at the stage of the layer formation and also during the isothermal contact of the multicomponent solution with the binary substrate. In the paper, the analysis of the InP and GaP substrate orientation on the state of liquid phase was carried out. The analysis based on the in situ comparative determination of the contact supersaturation of the Ga-In-P-As and Ga-In-P solutions. It was found that the contact supersaturation of the alloy was connected with the coupling mechanism of the interface with the binary substrate.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 745-748
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Temperature on Refractive Indices of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Berkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1928265.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
Opis:
A simple theoretical approach based on Kramers-Krönig relations predicts well the dispersion and birefringence of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$. In the whole transparency region the birefringence of both compounds is too low to offset dispersion in the process of a second harmonic generation, thus the crystals cannot be made phase matchable. Birefringence of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ is stable with respect to the temperature region of 300-550 K. The refractive indices increase linearly at a rate of 2 × 10$\text{}^{-5}$ K$\text{}^{-1}$ with increasing temperature.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 167-172
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Argon on the Deposition and Structure of Polycrystalline Diamond Films
Autorzy:
Benzhour, K.
Szatkowski, J.
Rozpłoch, F.
Stec, K.
Powiązania:
https://bibliotekanauki.pl/articles/1535896.pdf
Data publikacji:
2010-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.A-
Opis:
Thin polycrystalline diamond films were deposited on prepared (100) Si substrate by hot filament chemical vapor deposition using a mixture of hydrogen, propane-butane and argon. During investigations the gas flow of argon was varied from 100 sccm to 400 sccm. Scanning electron microscopy analysis revealed that the addition of argon to the gas phase influenced the growth rate and film structure. An increase of argon concentration provokes an increase in film porosity and decrease in crystalline facetting. The quality of these films was investigated with the use of the Raman spectroscopy.
Źródło:
Acta Physica Polonica A; 2010, 118, 3; 447-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of Swift Proton Transmission through Tapered Glass Capillaries
Autorzy:
Komarov, F.
Kamyshan, A.
Pil'ko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1503781.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.35.+a
Opis:
A study of the 150-300 keV proton beam transmission through glass (borosilicate) tapered capillaries with different diameters of the input and output of the capillary was performed. The focusing effect was observed. The areal density of the transmitted beam is enhanced by approximately 20 times. It was shown that changing a taper angle from 0.5 deg to 1.7 deg evidences the increase of the transmission coefficient more than by 300 times keeping the initial energy spectrum of ions.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 16-18
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Properties, Mechanical Stability, and State Densities of Aluminnides
Autorzy:
Zhang, B.
Jia, Z.
Duan, X.
Powiązania:
https://bibliotekanauki.pl/articles/1400124.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.A-
Opis:
First-principles calculations were performed to study on alloying stability, electronic structure, and mechanical properties of Al-based intermetallic compounds. The results show that the lattice parameters obtained after full relaxation of crystalline cells are consistent with experimental data. The calculation of cohesive energies indicated that the structure stability of these Al-based intermetallics will become higher with increasing Zr element in crystal. The calculations of formation energies showed that $AlCu_2Zr$ has the strongest alloying ability, followed by $AlZr_3$ and finally the $AlCu_3$. Further analysis finds out that single-crystal elastic constants at zero-pressure satisfy the requirement of mechanical stability for cubic crystals. The calculations on the ratio of bulk modulus to shear modulus reveal that $AlCu_2Zr$ can exhibit a good ductility, followed by $AlCu_3$, whereas $AlZr_3$ can have a poor ductility; however, for stiffness, these intermetallics show a converse order. The calculations on Poisson's ratio show that $AlCu_3$ is much more anisotropic than the other two intermetallics. In addition, calculations on densities of states indicates that the valence bonds of these intermetallics are attributed to the valence electrons of Cu 3d states for $AlCu_3$, Cu 3d and Zr 4d states for $AlCu_2Zr$, and Al 3s, Zr 5s and 4d states for $AlZr_3$, respectively; in particular, the electronic structure of the $AlZr_3$ shows the strongest hybridization, leading to the worst ductility.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 668-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plate Heat Exchangers as a Compact Design and Optimization of Different Channel Angles
Autorzy:
Kan, M.
Ipek, O.
Gurel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1402529.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.15.+a
Opis:
In this study, thermal treatments have been investigated for different channel angles and mass flow rates of a compact heat exchanger have been manufactured by direct metal laser sintering technique instead of a sealed and brazed one used in many areas. Boundary conditions of available heat exchanger experimental test have been used in laboratory. In this study, we have designed for compact heat exchanger of 30°, 45° and 60° channel angle and used three different mass flow rates (0.2, 0.3, and 0.43 kg/s). Heat transfers occurring between heat channels and walls of heat exchangers for different channel angles and efficiency of heat exchangers have been calculated. As a result of the analysis, it has been determined that in order for maximum of heat transfer of a compact heat exchanger, following working conditions ought to be fulfilled: channel angle 30°, hot water input temperature 60°C, cold water input temperature 15°C, and mass flow rate 0.43 kg/s.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-49-B-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic Force Microscopy Studies of the Surface Scale Formed During Oxidation of Incoloy Ma956
Autorzy:
Czyrska-Filemonowicz, A.
Wasilkowska, A.
Szot, K.
Quadakkers, W. J.
Powiązania:
https://bibliotekanauki.pl/articles/1968770.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
Opis:
The formation of thin oxide films on {111} and {110} single crystal specimens of Fe20Cr5Al based oxide dispersion strengthened alloy during the early stages of oxidation up to 1000°C was investigated by atomic force microscopy. The atomic force microscopy results revealed the crystalline character of a corrosion layer. The alumina scale morphology (height and grain size of crystallites) was only slightly dependent on the crystallographic texture of the underlying bulk material. The results show that atomic force microscopy has the potential to study surface structure of oxide layers in the initial stages of an oxidation process.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 399-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Distribution of Magnetization in the Pyramid-Like Ising Nanoscopic System Interacting with the Substrate
Autorzy:
Borkowski, L.
Jacyna-Onyszkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1814026.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
Opis:
We study thermodynamic properties of an Ising model of a ferromagnetic nanoscopic pyramid deposited onto a ferromagnetic bulk substrate. The influence of the interaction between the pyramid and the substrateis calculated in terms of the reduced-state (density) operator used for description of thermodynamic properties of nanoscopic systems. The spatial distribution of the magnetization in the nanoscopic pyramid is obtained in the molecular field approximation.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1223-1230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real Estate Market under Catastrophic Change
Autorzy:
Bełej, M.
Kulesza, S.
Powiązania:
https://bibliotekanauki.pl/articles/1400163.pdf
Data publikacji:
2013-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.-a
89.20.-a
89.65.Gh
Opis:
Within the last decade, real estate prices in Poland have changed significantly. We believe that these prices inevitably reflect the dynamics of the real estate market, and therefore they can be used to track its evolution path. To study whether and how the prices (regarded as a state variable) change over time depending on such control variables as gross domestic product and central bank interest rates, the theory of discontinuous change (also known as the catastrophe theory) was used. Catastrophic model assumes that small price fluctuations are associated with stable, long-term development of the market, whereas rapid changes are always due to short-term instabilities. In such a picture, the system evolution path draws a smooth curve within the stability area passing continuously between neighboring equilibrium states, and it rarely enters into the instability area to jump over the potential barrier to another equilibrium state.
Źródło:
Acta Physica Polonica A; 2013, 123, 3; 497-501
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Magnetite Formed by Biomineralization and Chemical Synthesis
Autorzy:
Timko, M.
Džarová, A.
Kopčanský, P.
Závišová, V.
Koneracká, M.
Kováč, J.
Šprincová, A.
Vaclavíková, M.
Ivaničová, L.
Vávra, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813922.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
47.65.Cb
87.83.+a
Opis:
In this work, the magnetic properties of biologically produced magnetite (magnetosomes) by biomineralization process were compared to those of chemically synthesized $Fe_3O_4$. The coercivity of 185 Oe in magnetosomes is connected with the fact that the mean diameter is larger than critical size for transition from superparamagnetic to ferromagnetic behavior. A sharp magnetic transition at 105 K (Verwey transition) is clearly present in magnetosomes while in opposite, this transition is missing in $Fe_3O_4$.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 573-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of Magnetoresistance in HoB₁₂
Autorzy:
Khoroshilov, A.
Krasnorussky, V.
Bogach, A.
Glushkov, V.
Demishev, S.
Levchenko, A.
Shitsevalova, N.
Filipov, V.
Gabáni, S.
Flachbart, K.
Anisimov, M.
Siemensmeyer, K.
Sluchanko, N.
Powiązania:
https://bibliotekanauki.pl/articles/1032153.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
Opis:
We present results of precision measurements of magnetoresistance of isotopically pure Ho¹¹B₁₂ at low temperatures 2÷10 K in magnetic field up to 80 kOe of different orientation to the crystal axes. The data obtained revealed strong anisotropy of magnetoresistance and allowed us to reconstruct magnetic H-T phase diagrams for main crystallographic directions H || [001], [110], and [111]. Analysis of magnetoresistance derivatives allowed to conclude in favor of two main magnetoresistance contributions. Among of them the negative quadratic component is attributed to charge carriers scattering on a magnetic clusters of Ho³⁺ ions (4f component) and positive linear one may be explained in terms of scattering on a spin density waves (5d component).
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 976-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing Temperature and Ambient on Formation, Composition and Bandgap of $Cu_2ZnSnS_4$ Thin Films
Autorzy:
Sun, Y.
Yao, B.
Meng, X.
Wang, D.
Long, D.
Hua, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1205220.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
Opis:
Amorphous Cu-Zn-Sn-S precursor films were prepared by sol-gel and spin-coating with copper chloride, zinc chloride, tin chloride and thiourea solutions as starting materials. A $Cu_2ZnSnS_4$ film with kesterite structure and a small amount of chlorine formed when the precursor was annealed under Ar ambient at temperature above 200°C, but its atomic ratios of Cu:Zn:Sn:S far deviated from stoichiometric ratios of the $Cu_2ZnSnS_4$. However, when the precursor films were annealed with sulfur powder together at temperatures between 360 and 480°C, the CZTS film containing a very small amount of Cl formed, and its atomic ratio change little for Cu, Zn, and Sn, increases for S and decreases for Cl with increasing temperature. When the temperature is 480°C, a CZTS only has Cu, Zn, Sn, and S element is fabricated, and the atomic ratio of Cu:Zn:Sn:S is near the stoichiometric ratio. The bandgap of the CZTS decreases with increasing annealing temperature. The mechanisms of the formation and the properties of the CZTS are suggested in the present work.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 751-756
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Pulverised Coal Fired Boiler with Different Burner Geometries
Autorzy:
Gurel, B.
Ipek, O.
Kan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402493.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.15.+a
Opis:
Pulverized coal combustion is extensively used in utility boilers, industrial boilers, furnaces, kilns, and other energy conversion appliances. The effective utilization of pulverized coal is the main problem in study of combustion processes, particularly in burning low-grade coal. It is well known that the emission of nitrogen oxides $(NO_{x})$ during coal combustion is a main environmental problem. In this study, three different pulverised coal burner geometries for a pulverised coal fired boiler have been studied by numerical analysis. GLI-Tunçbilek coal was used as fuel. Three-dimensional numerical analysis was carried out using Ansys Fluent code. Realizable K-ε turbulence method, single rate devolatilization method, multiple char combustion method and second-order upwind discretization method were used during calculations. Coal particle diameter and coal mass flow rate were assumed to be 70 μm and 378 kg/h respectively.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-43-B-45
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 564

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