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Wyświetlanie 1-25 z 290
Tytuł:
On the Thermodynamics of the Hopfield Neural Network with External Field
Autorzy:
Ulaczyk, J.
Kosiński, R. A.
Zagórski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036992.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
Opis:
In the paper thermodynamic properties of an artificial neural network are analyzed in a way analogous to spin glasses theory. Synaptic connections are calculated numerically according to the Hebb rule and their distribution is obtained for different characteristics of stored patterns. The phase diagrams and magnetization are established in dependence on the temperature of the network and the external field (threshold). It was showed that changing control parameters typical of artificial neural network (i.e. number of stored patterns and pattern bias level) one obtains the results similar to the Sherrington-Kirkpatrick model of spin glass.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 479-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Studies of Polytype Structure in Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se
Autorzy:
Cichos, A.
Firszt, F.
Falke, U.
Lenzner, J.
Męczyńska, H.
Hietschold, M.
Powiązania:
https://bibliotekanauki.pl/articles/1995011.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
Opis:
Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se crystals grown by Bridgman method show spatial transition from sphalerite (3C) to wurzite structure (2H) with increasing Mg content (x). Within the transition range, near x=0.19, coexistence of hexagonal and cubic structure results in the formation of polytype sequences of 3C-8H-4H-2H. We have investigated the spatial distribution of the polytypes in Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se mixed crystals with a value of x close to that of the phase transition using spectrally as well as spatially resolved cathodoluminescence. Three emission bands in the cathodoluminescence spectrum have been observed, two strong lines at 2.99 eV and 2.965 eV, and a weak shoulder at 2.95 eV. The lines at 2.965 and 2.99 eV are known in the literature as an exciton recombination in the 8H and 4H polytype structure. We have found the third one at 2.95 eV to be due to luminescence in the 3C structure. These results demonstrate the usefulness of cathodoluminescence measurements for investigations of spatial distribution of inhomogeneities of mixed semiconductors.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 269-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of the Kinetics for Rhodium Adsorption onto Gallic Acid Derived Polymer: the Application of Nonlinear Regression Analysis
Autorzy:
Can, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193890.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Hk
Opis:
The kinetic behaviors of solute adsorption at solid/solution interfaces of rhodium (III) complexes from chloride solutions (1 M HCl) onto gallic acid formaldehyde resol polymer were studied by batch mode. Kinetics was analyzed by the pseudo first-order, the pseudo second-order, the Elovich and the intraparticle diffusion kinetic equations using nonlinear regression analysis. The rate constants of four models were calculated. The Non-linear Chi-square analysis and correlation coefficients have been calculated in order to assess which model provides the best fitting predicted data with experimental results. The pseudo second-order equation provides the best fit to experimental data. The first initial kinetics is governed by the rate of surface reaction. When the adsorbed amount reaches about 95% of the equilibrium coverage in the first sixty minutes, it switches to another kinetics governed by the rate of intraparticle diffusion. The proposed adsorption of the aquachlororhodium (III) species mostly takes place via a ligand exchange mechanism.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1308-1310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on the Ion Beam Induced Luminescence of Oxide Powders Doped with Rare Earth Elements
Autorzy:
Gawlik, G.
Panczer, G.
Moncoffre, N.
Jagielski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1400478.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
Opis:
The hydrogen ion beam induced luminescence of gadolinium oxide $Gd_2O_3$ doped with 1% of holmium (Ho) and 1% of bismuth (Bi) was investigated. Degradation of the holmium related 549 nm ion beam induced luminescence line intensity during hydrogen ion irradiation was observed. Two different mechanisms of the ion beam induced luminescence degradation has been proposed: the first one related to the accumulation of ion induced target material damage and the second mechanism related to the target temperature growth during ion beam bombardment. The experimental method for separation of both mechanisms effects was proposed and demonstrated.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 920-922
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rhodium Adsorption on Gallic Acid Resol Resin
Autorzy:
Can, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401365.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Hk
Opis:
A new adsorbent resin has been developed by immobilizing gallic acid with formaldehyde, and its adsorption properties to $Rh^{3+}$ were reviewed with respect to the collection in aqueous solution. Linear and nonlinear regression procedures have been applied to the Langmuir, Freundlich, Tempkin, Dubinin-Radushkevich, and Redlich-Peterson isotherms. The resin exhibited good adsorption capacity towards $Rh^{3+}$ from acidic aqueous solutions ($[H^{+}]$=1 M, $[Cl^{-}]$=1 M). The equilibrium adsorption capacity at 293 K was up to 69.43 mg $g^{-1}$. The adsorption isotherms could be well described by Langmiur equation. The experimental studies suggested that gallic acid formaldehyde resin was effective for the adsorption of $Rh^{3+}$ from chloride acid solutions, and the loaded $Rh^{3+}$ could be easily desorbed from the 1 M HNO₃ + 0.1 M NaClO₃ solution mixture with a hundred percent efficiency. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were calculated. The adsorption of Rh^{3+} was found to be an endothermic adsorption process. This suggested that the resin can be used as an active biosorbent for the recovery of $Rh^{3+}$ from 1 M HCl concentrated acid solution.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1301-1307
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Emission Properties of GaN-Based Laser Diode Structures
Autorzy:
Godlewski, M.
Phillips, M. R.
Czernecki, R.
Targowski, G.
Perlin, P.
Leszczyński, M.
Figge, S.
Hommel, D.
Powiązania:
https://bibliotekanauki.pl/articles/2043715.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.-z
78.60.Hk
68.37.Hk
Opis:
Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green Synthesis of Pd Nanoparticles via Gallic Acid
Autorzy:
Can, M.
Powiązania:
https://bibliotekanauki.pl/articles/1033577.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Hk
Opis:
A facile, eco-friendly, room-temperature method for rapid one-pot synthesis of Pd metallic nanoparticles has been developed based on the successive reduction of Pd(II) precursors with gallic acid in an aqueous environment. The morphology and surface analysis of the resulting Pd nanoparticles were confirmed by aberration corrected scanning transmission electron microscopy followed by X-ray photoelectron spectroscopy. The particle size of palladium nanoparticles was calculated as 16 nm. This study demonstrates that the synthesis of nanoparticles (reduction and stabilization) can be effectively achieved using gallic acid.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 569-570
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dark Photon Searches with the KLOE Detector
Autorzy:
Bloise, C.
Powiązania:
https://bibliotekanauki.pl/articles/1402644.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
13.66.Hk
Opis:
The KLOE-2 experiment at the Frascati Laboratory has recently obtained several results on dark photon searches. We present published analyses and the preliminary results of the study of the final states with e⁺e¯γ, and μ⁺μ¯ plus missing energy.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1565-1567
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Preparation of Core-Shell $Al_2O_3//Cu$ Composite Powders by Electroless Plating in the Alkaline Solution
Autorzy:
Uysal, M.
Karslioğlu, R.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399707.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
Opis:
In this study, Cu-coated $Al_2O_3$ composite powders were synthesized by using electroless plating method. The influence of the plating bath composition and ceramic powder concentration on the Cu plating was characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The results showed that the electroless bath composition plays an important role for the structure of nano core-shell $Al_2O_3//Cu$ composite powders. The content of copper in the composite powders could be effectively controlled by adjusting the content of copper sulfate and formaldehyde in the plating solution. Furthermore, the pretreatment of the $Al_2O_3$ powders is also a key factor to form a uniform shell copper layer coating on $Al_2O_3$ particles.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 238-240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between Sample Morphology and Carrier Diffusion Length in GaN Thin Films
Autorzy:
Godlewski, M.
Goldys, E. M.
Phillips, M.
Böttcher, T.
Figge, S.
Hommel, D.
Czernecki, R.
Prystawko, P.
Leszczynski, M.
Perlin, P.
Wisniewski, P.
Suski, T.
Bockowski, M.
Grzegory, I.
Porowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2035593.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Mm
68.37.Hk
78.60.Hk
Opis:
Scanning and spot-mode cathodoluminescence investigations of homo- and hetero-epitaxial GaN films indicate a surprisingly small influence of their microstructure on overall intensity of a light emission. This we explain by a correlation between structural quality of these films and diffusion length of free carriers and excitons. Diffusion length increases with improving structural quality of the samples, which, in turn, enhances the rate of nonradiative recombination on structural defects, such as dislocations.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 627-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Measurements at Liquid Helium Temperature of Poly- and Monocrystalline ZnO Films
Autorzy:
Witkowski, B.
Wachnicki, Ł.
Jakieła, R.
Guziewicz, E.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492546.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
77.55.hf
68.37.Hk
61.72.Ff
Opis:
Scanning electron microscopy, cathodoluminescence and secondary ion mass spectroscopy investigations are used to study an inter-link between structural quality, elements distribution and light emission properties of ZnO poly- and monocrystalline films grown by the atomic layer deposition. Cathodoluminescence and scanning electron microscopy investigations were performed at liquid helium temperature for four different types of ZnO films deposited on different substrates.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-028-A-030
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Secondary Electroluminescence on Cathodoluminescence and Other Luminescence Measurements
Autorzy:
Pluska, M.
Czerwinski, A.
Szerling, A.
Ratajczak, J.
Kątcki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1198425.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
85.30.De
61.72.-y
68.37.Hk
Opis:
Cathodoluminescence and photoluminescence measurements are commonly accepted as revealing local properties of a specimen region excited by a beam of electrons or photons. However, in the presence of a strong electric field (e.g. a junction) an electron (or light/laser) beam-induced current is generated, which spreads over the structure. A secondary non-local electroluminescence, generated by this current and detected together with the expected luminescence signal, may strongly distort measurement results. This was confirmed by cathodoluminescence measurements on test structures prepared by focused ion beam on AlGaAs/GaAs/InGaAs laser heterostructures. Methods for minimizing the distortion of measured luminescence signals are presented.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1027-1032
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Profiling of InGaN-Based Quantum Well Structures and Laser Diodes - In-Plane Instabilities of Light Emission
Autorzy:
Godlewski, M.
Ivanov, V. Yu.
Goldys, E. M.
Phillips, M.
Böttcher, T.
Figge, S.
Hommel, D.
Czernecki, R.
Prystawko, P.
Leszczynski, M.
Perlin, P.
Grzegory, I.
Porowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2036870.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Mm
68.37.Hk
78.60.Hk
Opis:
Instabilities of light emission and also of stimulated emission in series of GaN epilayers and InGaN quantum well structures, including laser diode structures, are studied. A stimulated emission is observed under electron beam pumping. This enabled us to study light emission properties from laser structures and their relation to microstructure details. We demonstrate large in-plane fluctuations of light emission and that these fluctuations are also present for excitation densities larger than the threshold densities for the stimulated emission.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 689-694
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Crystallization Process of Eu$\text{}^{3+}$:CaSiO$\text{}_{3}$ Gel Using Optical and Thermal Methods
Autorzy:
Andrić, Ž.
Krsmanović, R.
Marinović-Cincović, M.
Dramićanin, T.
Šećerov, B.
Dramićanin, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/2047860.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
61.46.Hk
68.37.Hk
78.67.Bf
81.70.Pg
Opis:
Alkoxy sol-gel technique is an important preparation method for production of rare-earth based phosphors. Crystallization of gel provides a way to prepare phosphors on lower working temperatures than those required for the solid state reactions. CaSiO$\text{}_{3}$ gel samples were obtained through hydrolysis-condensation reactions of tetraethylorthosilicate as silica source. In this work we studied the process of crystallization of Eu$\text{}^{3+}$-activated CaSiO$\text{}_{3}$ gel and decomposition of organic precursors by means of thermal analysis and infrared spectroscopy. Results of scanning electron microscopy and energy-dispersion spectrometry are used to check chemical composition and morphology of synthesized material. Emission spectra and emission lifetime measurements are performed to investigate luminescence properties of Eu$\text{}^{3+}$ doped CaSiO$\text{}_{3}$ powder.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 969-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Thermal Investigation of Sol-Gel Derived Eu$\text{}^{3+}$:Y$\text{}_{2}$SiO$\text{}_{5}$ Nanoparticles
Autorzy:
Krsmanović, R.
Andrić, Ž.
Marinović-Cincović, M.
Zeković, I.
Dramićanin, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/2047861.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
61.46.Hk
68.37.Hk
78.67.Bf
81.70.Pg
Opis:
Investigation done on Y$\text{}_{2}$SiO$\text{}_{5}$ nanoparticles doped with Eu$\text{}^{3+}$ ions obtained with the alkoxy sol-gel route is presented in this paper. We investigate the optical and thermal properties of obtained material during the conversion of the gel into nanocrystalline form. Fourier transform infrared spectroscopy and fluorescence spectroscopy of Eu$\text{}^{3+}$ ions are used for the optical characterizations, while thermal analysis is done with thermogravimetric-differential thermal analysis technique. Material exhibits characteristic luminescence emission of the trivalent europium ion.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 975-980
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Species of Heavy Lanthanides(III) Chelates Extracted into Organic Phase with 5,7-Dichloro-8-hydroxyquinoline
Autorzy:
Czakis-Sulikowska, D.
Malinowska, A.
Pustelnik, N.
Kuźnik, B.
Powiązania:
https://bibliotekanauki.pl/articles/1945659.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
82.30.Hk
Opis:
The nature of species formed in the extraction of lanthanides Ln(III) (where Ln = Tb, Dy, Ho, Er, Tm and Yb) with 5,7-dichloro-8-hydro xyquinoline (HL) in CHCl$\text{}_{3}$ from water or water-methanol phase was examined. It was stated that during the extraction from water phase the chelates LnL$\text{}_{3}$ (Tb, Tm), seven-coordinated self-adducts LnL$\text{}_{3}$ ÷ HL (Er, Ho) or both types of these species (Dy, Yb) were extracted. In the presence of methanol (MeOH) in the aqueous phase the eight-coordinated mixed species of the type LnL$\text{}_{3}$·2MeOH were observed.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 427-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gaussian Fluctuations of Molecular Field in Quasi-One-Dimensional Ising Model
Autorzy:
Onyszkiewicz, Z.
Wierzbicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/2007877.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
75.70.Ak
Opis:
Quasi-one-dimensional spin systems described by an Ising-like Hamiltonian with a strong space anisotropy (s=1/2) are investigated. Magnetic properties of this model are examined in the approximation including Gaussian fluctuations of molecular field. This paper reports an attempt at obtaining more accurate results for Gaussian fluctuation of molecular field by an exact formula for mean fluctuations of a spin.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 413-421
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Two-Step Oxidation on Performance of Micro-Arc Oxidation on 6063 Aluminum Alloy
Autorzy:
Ayday, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032524.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Mq
68.37.Hk
Opis:
This paper investigates the effect of different electrolytes containing silicate and phosphate by two-step oxidation using the micro-arc oxidation technique. The growth effect, surface roughness, and element distributions of the micro-arc oxidation coatings were characterized. The composition of coating was characterized using X-ray diffraction and energy dispersive spectrum, and the morphology was examined using scanning electron microscope. The surface characterizations results show that the coating growth forms are different in Si and P electrolytes while the coated samples were almost composed of γ-Al₂O₃.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 96-98
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Substrate Temperature on the Structural and Optical Properties of Nanocrystalline Cadmium Selenide Thin Films Prepared by Electron Beam Evaporation Technique
Autorzy:
Suthan Kissinger, N.
Suthagar, J.
Saravana Kumar, B.
Balasubramaniam, T.
Perumal, K.
Powiązania:
https://bibliotekanauki.pl/articles/1535702.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
81.05.Dz
Opis:
Cadmium selenide (CdSe) thin films on glass substrates were prepared by physical vapour deposition under vacuum using the electron beam evaporated technique for different substrate temperatures: room temperature, 100, 200, 300°C, respectively. X-ray diffraction analysis indicates that the films are polycrystalline, having hexagonal (wurtzite) structure irrespective of their substrate temperature. All the films show most preferred orientation along (0 0 2) plane parallel to the substrates. The microstructural parameters such as particle size, stress, strain and dislocation density were calculated. The grain size of deposited CdSe films is small and is within the range of 18 to 42 nm. The optical absorption spectra of electrom beam deposited CdSe films were studied in the wavelength region of 250-2500 nm. The energy gap $(E_{g})$ values (allowed direct transitions), calculated from the absorption spectra, ranged between 1.77 and 1.92 eV. The surface morphological quality of electron beam evaporated CdSe films were analyzed by scanning electron microscopy and atomic force microscopy.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 623-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates
Autorzy:
Poplavsky, V.
Komarov, F.
Luhin, V.
Pil'ko, V.
Partyka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402241.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
68.55.Nq
Opis:
Ion beam assisted deposition of alloying metals (Zn, Cd, Zr, Cr) onto pure aluminum and aluminum alloy substrates from the plasma of a pulsed arc discharge for the purpose of materials corrosion stability was carried out. The Rutherford backscattering spectrometry, electron backscatter diffraction, scanning electron microscopy, and electron probe microanalysis methods were applied to investigate composition and microstructure of the prepared layers. It was found that the obtained layers are characterized by amorphous atomic structure and contain the atoms of deposited metal, substrate material components, as well as impurities of oxygen and carbon; their thickness was measured to be ≈ 30-100 nm.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 946-948
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Model of Local Prices and Associated Risk Evaluation
Autorzy:
Urbanowicz, K.
Hołyst, J.
Richmond, P.
Powiązania:
https://bibliotekanauki.pl/articles/1812217.pdf
Data publikacji:
2008-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
75.10.Hk
Opis:
A simple spin system is constructed to simulate dynamics of asset prices and studied numerically. The outcome for the distribution of prices is shown to depend both on the dimension of the system and the introduction of price into the link measure. For dimensions below 2, the associated risk is high and the price distribution is bimodal. For higher dimensions, the price distribution is Gaussian and the associated risk is much lower. It is suggested that the results are relevant to rare assets or situations where few players are involved in the deal making process.
Źródło:
Acta Physica Polonica A; 2008, 114, 3; 501-506
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Si Multidot FETs for Single-Electron Transfer and Single-Photon Detection
Autorzy:
Tabe, M.
Nuryadi, R.
Moraru, D.
Burhanudin, Z.
Yokoi, K.
Ikeda, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813190.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
73.23.Hk
Opis:
Recently, there have been increasing demands for controlling individual electrons, photons, and dopants in developing nm scale Si devices. Our most recent results on Si single-electron nano-devices will be presented. We have demonstrated single-electron transfer in random-tunnel-junctions by a cycle of ac gate bias, detection of photons and detection of individual acceptor ions by Si single-hole transistor.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 811-814
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Level Occupancy Anomalies in a Double QD System
Autorzy:
Stefański, P.
Powiązania:
https://bibliotekanauki.pl/articles/1810305.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Kv
73.23.Hk
Opis:
A double quantum dot system is considered in the presence of the electron intra-Coulomb U interactions within the dots and inter-Coulomb $U_{12}$ interactions between them. We show that both for spinless and spinfull electrons the dots occupancy anomalies are encountered and caused by electron correlations. This non-monotonic behavior strongly deviates from usual level filling at the Coulomb blockade. For spinfull electrons the inter-dot interaction modifies also on-site electron correlations.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 92-94
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of mechanical properties and artificial neural networks modeling of PP/PET blends
Autorzy:
Özcanli, Y.
Kosovali Çavuş, F.
Beken, M.
Powiązania:
https://bibliotekanauki.pl/articles/1068230.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.hk
07.05.Mh
Opis:
The aim of this study is to show the applicability of artificial neural networks, which are getting more applications with the advancement of technology, to determine the mechanical properties of polymeric materials. Mechanical properties of pure polypropylene, polyethylene terephthalate and their blends are determined in this study and the effect of temperature (room temperature, 40°C and 60°C) on mechanical properties is investigated. The method of artificial neural networks is used to make a prediction for mechanical properties. Mechanical properties of samples are measured using Lloyd 250N capacity tension and compression apparatus at crosshead speed of 10 mm/min, 25 mm/min, and 50 mm/min. For artificial neural networks modelling, the tensile experiment results, temperature, percent ratio, and crosshead speed are used as the input and output parameters. Three-layered multilayer perceptron, feed-forward neural network architecture is used and trained with the error back propagation. The results obtained from the output of the network are compared with the experiment results. The suitability of the method is found to be satisfactory.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 444-446
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Martensite reorientation after thermal cycling in NiTiCu shape memory alloys studied by EBSD technique
Autorzy:
Rak, J.
Goryczka, T.
Ochin, P.
Powiązania:
https://bibliotekanauki.pl/articles/1153063.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
68.37.Hk
Opis:
The Ni₂₅Ti₅₀Cu₂₅ shape memory alloy exhibits one-step martensitic transformation. Transformation occurs between the B2 parent phase and the B19 orthorhombic martensite. The course of the martensitic transformation was in situ studied in the alloy with use of electron backscatter diffraction. During heating, reverse martensitic transformation occurs from the B19 orthorhombic martensite to the B2 parent phase. On cooling, from the parent phase the B19 martensite is formed. Obtained results proved that the B19 martensitic plates forms the variants indexed as 1, 3, and 5. Thermal cycling does not change the crystallographic correlation between the parent phase and the martensite. However, after cycling, different rearrangement of the martensitic plates can be received. In consequence, characteristic temperatures of the martensitic transformation are shifted.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1075-1078
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 290

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