Skocz do pozycji: 1.

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

/5

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Skocz do pozycji: 2.

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

/5

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Skocz do pozycji: 3.

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

/5

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Skocz do pozycji: 4.

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

/5

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Skocz do pozycji: 5.

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

/5

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Skocz do pozycji: 6.

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

/5

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Skocz do pozycji: 7.

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

/5

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Skocz do pozycji: 8.

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

/5

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Skocz do pozycji: 9.

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

/5

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Skocz do pozycji: 10.

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

/5

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Skocz do pozycji: 11.

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

/5

Artykuł

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Skocz do pozycji: 12.

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

/5

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Skocz do pozycji: 13.

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

/5

Artykuł

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Skocz do pozycji: 14.

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

/5

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Skocz do pozycji: 15.

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

/5

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Skocz do pozycji: 16.

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

/5

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Skocz do pozycji: 17.

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

/5

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Skocz do pozycji: 18.

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

/5

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Skocz do pozycji: 19.

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

/5

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Skocz do pozycji: 20.

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

/5

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Skocz do pozycji: 21.

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

/5

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Skocz do pozycji: 22.

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

/5

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Skocz do pozycji: 23.

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

/5

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Skocz do pozycji: 24.

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

/5

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Skocz do pozycji: 25.

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

/5

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Skocz do pozycji: 26.

Tytuł:

Frustration in a Mixed-Spin Ising Model With Multi-Spin Interactions

Autorzy:

Jaščur, M.
Štubňa, V.
Szalowski, K.
Balcerzak, T.

Powiązania:

https://bibliotekanauki.pl/articles/1199553.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

5.50.+q
75.10.Hk

Opis:

In this work we investigate a mixed spin-1/2 and spin-1 Ising model on a decorated square lattice. In addition to standard pair interactions between nearest neighbors, we also consider in our calculations three-site four-spin interactions and the effect of single ion anisotropy. Applying the well-known decoration-iteration transformation, we derive a simple relation between the partition function of the model under investigation and the Onsager's partition function for the simple square lattice. With the help of this mapping relation we are able to calculate exact expressions for all relevant physical quantities of the system (for example, the magnetization, internal energy, Gibbs free energy, entropy and specific heat). The most interesting results have been found in the model without pair interactions. In this case, besides the standard ordered and disordered phases, there also appears an interesting phase which is ordered only partially. Analyzing relevant physical quantities of the system, we have found that the partial ordering is closely related to very strong frustrations that lead to non-zero entropy at T=0.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 48-49
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal

Autorzy:

Lowe, M.
Gille, P.
McGrath, R.
Sharma, H.

Powiązania:

https://bibliotekanauki.pl/articles/1373238.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.44.Br
68.37.Hk

Opis:

We have studied the effect of leaching treatments on the surface microstructure and chemical composition on the two different twofold surfaces, (10000) and (101̅00), and the tenfold surface (00001) of a decagonal (d-) Al-Ni-Co quasicrystal. A sample exposing the three surfaces was leached with NaOH solution and then studied using atomic force microscopy and scanning electron microscopy combined with energy dispersive X-ray analysis. The leaching treatment preferentially removes the Al present in the crystal surface leaving a mixture of transition metal and their associated oxides. The high symmetry, tenfold axis was found to be less resistant to leaching than either of the twofold axes, providing further information regarding the effect of crystallographic direction on leaching kinetic.

Źródło:

Acta Physica Polonica A; 2014, 126, 2; 520-523
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

New Functional Materials Based on Nano- and Micro-Objects with Developed Surface

Autorzy:

Dorogov, M.
Dovzhenko, O.
Gryzunova, N.
Vikarchuk, A.
Romanov, A.

Powiązania:

https://bibliotekanauki.pl/articles/1402063.pdf

Data publikacji:

2015-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.-t
68.37.Hk

Opis:

The paper describes the materials with a developed surface fabricated on the basis of electrodeposited copper icosahedral small particles and coatings made of such particles. Increasing the specific surface area of the electrolytic metal is achieved by special heat and/or chemical treatments. Changes in the structure and morphology of icosahedral small particles are analyzed with scanning electron microscopy and X-ray diffraction. The specific surface area of the material is determined with low-temperature gas adsorption technique. Annealing of icosahedral small particles and coatings leads to the formation of the porous structure and a "forest" of whiskers on their surface. Chemical etching of icosahedral small particles corrodes the inside material and provides the formation of hollow particles. Possible applications for obtained materials with a developed surface are offered.

Źródło:

Acta Physica Polonica A; 2015, 128, 4; 503-505
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 29.

Tytuł:

Hydroquinone Synthesis of Silver Nanoparticles from Silver Bromide Suspensions

Autorzy:

Król-Gracz, A.
Nowak, P.
Michalak, E.
Dyonizy, A.

Powiązania:

https://bibliotekanauki.pl/articles/1491287.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.-Bc
61.46.Hk

Opis:

The results of research into the preparation of silver nanoparticles using photoreduction in the presence of hydroquinone as the reductant were discussed. Substrates for the synthesis of silver nanoparticles were ultrafine crystalline gelatine-stabilised aqueous suspensions of silver bromide. The influence of the reductant to substrate molar ratio and the medium's pH to the efficient production of silver nanoparticles were studied. The properties of resultant silver particles were examined using UV-Vis spectroscopy. Transmission electron microscopy was used for the photomicrography of silver nanoparticles suspensions.

Źródło:

Acta Physica Polonica A; 2012, 121, 1; 196-199
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 30.

Tytuł:

Tunneling Transfer Protocol in a Quantum Dot Chain Immune to Inhomogeneity

Autorzy:

Korzekwa, K.
Machnikowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/1492853.pdf

Data publikacji:

2011-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.21.La
03.67.Hk

Opis:

We propose a quantum dot implementation of a quantum state transfer channel. The proposed channel consists of N vertically stacked quantum dots with the nearest neighbor tunnel coupling, placed in an axial electric field. We show that the system supports high-fidelity transfer of the state of a terminal dot both by free evolution and by adiabatic transfer. The protocol is to a large extent insensitive to inhomogeneity of the energy parameters of the dots and requires only a global electric field.

Źródło:

Acta Physica Polonica A; 2011, 120, 5; 859-861
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 31.

Tytuł:

Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons

Autorzy:

Švec, P.
Mat'ko, I.
Marcin, J.
Kováč, J.
Vlasák, G.
Janičkovič, D.
Škorvánek, I.

Powiązania:

https://bibliotekanauki.pl/articles/1534100.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.37.Hk
68.37.Lp

Opis:

Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 832-834
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 32.

Tytuł:

Swift $Xe^{26+}$ Ion Irradiation Effect on Luminescent Properties of Undoped and Cd-Doped ZnO Films

Autorzy:

Myroniuk, D.
Lashkarev, G.
Shtepliuk, I.
Skuratov, V.
Reszka, A.
Kowalski, B.

Powiązania:

https://bibliotekanauki.pl/articles/1376457.pdf

Data publikacji:

2014-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.Et
78.60.Hk

Opis:

Here we report the effect of the irradiation by 167 MeV $Xe^{26+}$ ions (in the fluence range up to 3× $10^{12}$ ions/$cm^2$) on the undoped and Cd-doped (0.4, 0.5 at.%) ZnO films deposited by radiofrequency magnetron sputtering. As-grown and irradiated samples were investigated by cathodoluminescence spectroscopy. It was found that the radiation causes a decrease in intensity of luminescent peaks and a redistribution of the radiative recombination channels. We revealed that the cadmium incorporation into ZnO lattice enhances the radiation resistance of ZnO film.

Źródło:

Acta Physica Polonica A; 2014, 126, 5; 1199-1202
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Regular and Chaotic Behaviour of a Kicked Damped Spin

Autorzy:

Hołyst, J.
Sukiennicki, A.

Powiązania:

https://bibliotekanauki.pl/articles/1920483.pdf

Data publikacji:

1992-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.45.+b
75.10.Hk

Opis:

The dynamics of a kicked, anisotropic, damped spin is reduced to a two-dimensional map. This map exhibits such features as bifurcation diagrams, regular or chaotic attractors/repellors and intermittent-like transitions between two strange attractors. With increase of damping a transition from chaos to the fixed point attractor occurs. On the contrary to the Hamiltonian case the type of magnetic anisotropy plays a crucial role for damped models.

Źródło:

Acta Physica Polonica A; 1992, 81, 3; 353-360
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 34.

Tytuł:

Electronic Transport through a Quantum Dot Coupled to Non-Collinear Ferromagnetic Electrodes: The Kondo Regime

Autorzy:

Świrkowicz, R.
Wilczyński, M.
Wawrzyniak, M.
Barnaś, J.

Powiązania:

https://bibliotekanauki.pl/articles/1813915.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.Hk
73.63.Kv

Opis:

Linear and non-linear conductance of quantum dots attached to magnetic leads is considered theoretically in the Kondo regime. The considerations are based on the non-equilibrium Green function formalism and the relevant equation of motion method. Splitting of the Kondo anomaly due to coupling of the dot to ferromagnetic electrodes, and its dependence on magnetic configuration of the system and on the lead's spin polarization is studied numerically.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 565-568
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

The Influence of Non-Magnetic Substrate on Spatial Distribution of Gaussian Fluctuations of Molecular Field in Magnetic Nanoparticles and Ultrathin Films

Autorzy:

Łosiński, R.
Onyszkiewicz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/2013980.pdf

Data publikacji:

2000-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.70.-i

Opis:

An Ising (s=1) model of ferromagnetic nanoparticles and ultrathin films of the sc structure deposited on a non-magnetic substrate is considered. The substrate was assumed to affect the crystal field around the atoms lying closest to it. Consequently, the one-ion anisotropy constant of spin moments of these atoms becomes dependent on the appropriate component of the tensor of the magnetic structure deformation. This dependence was assumed to be linear. To obtain approximations of the Gaussian fluctuations of molecular field, the generalised equilibrium reduced density operator, along with the Feynman diagram technique were used. As a result, temperature dependences of the spatial distributions of mean fluctuations of the magnetic field versus the changes in the one-ion anisotropy constant induced by the non-magnetic substrate were obtained.

Źródło:

Acta Physica Polonica A; 2000, 97, 5; 955-958
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Cathodoluminescence Study of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te and Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te

Autorzy:

Hołda, A.
Rodzik, A.
Melnikov, A. A.
Żukowski, P. W.

Powiązania:

https://bibliotekanauki.pl/articles/1933757.pdf

Data publikacji:

1995-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.60.Hk
78.55.Et

Opis:

The cathodoluminescence spectra for Cd$\text{}_{1-x}$Μn$\text{}_{x}$Te (0 < x ≤ 0.7) and Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te (0 < x ≤ 0.6) at room and liquid nitrogen temperature have been presented and discussed. Especially, the influence of increasing temperature and Mn content on cathodoluminescence spectra. The cathodoluminescence emission in Ζn$\text{}_{1-x}$Mn$\text{}_{x}$Te (Cd$\text{}_{1-x}$Μn$\text{}_{x}$Te) centered at ≈ 1.95 eV (2.0 eV) and ≈ 2.2 eV (2.5 eV) are ascribed to Stokes-shifted $\text{}^{4}$Τ$\text{}_{1}$($\text{}^{4}$G) → $\text{}^{6}$A$\text{}_{1}$($\text{}^{6}$S) and $\text{}^{4}$Τ$\text{}_{2}$($\text{}^{4}$G) → $\text{}^{6}$A$\text{}_{1}$($\text{}^{6}$S) internal transitions of Mn$\text{}^{+2}$ within the 3d$\text{}^{5}$ state, respectively.

Źródło:

Acta Physica Polonica A; 1995, 88, 4; 739-742
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 37.

Tytuł:

H&K w Toruniu : polska premiera HK 121

Autorzy:

Wilk, Remigiusz.

Powiązania:

Raport. Wojsko - Technika - Obronność 2012, nr 5, s. 18-31

Data publikacji:

2012

Tematy:

Karabiny maszynowe budowa i konstrukcje Niemcy
HK121 (karabin) dane taktyczno-techniczne Niemcy
HK121 (karabin) budowa i konstrukcje Niemcy
HK121 (karabin) pokazy Niemcy

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

Artykuł

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Skocz do pozycji: 38.

Tytuł:

HK416 dla Norwegów

Autorzy:

Wilk, Remigiusz.

Powiązania:

Raport. Wojsko - Technika - Obronność 2007, nr 5, s. 44-46

Data publikacji:

2007

Tematy:

HK416 (karabinek) budowa i konstrukcje przemysł handel Niemcy
HK416 (karabinek) Norwegia
Karabinki budowa i konstrukcje przemysł handel Niemcy

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

Artykuł

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Skocz do pozycji: 39.

Tytuł:

Monte Carlo Study of a Periodically Pinned 2D Superconductor

Autorzy:

Rezlescu, N.
Anghelache, R.
Ciobotaru, I.

Powiązania:

https://bibliotekanauki.pl/articles/1955503.pdf

Data publikacji:

1997-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.60.Fr
75.10.Hk
74.25.Bt

Opis:

We show that a natural assumption on the moving mechanism of vortices in a periodically pinned, two-dimensional superconductor in the mixed state is the basis for a n-clock-like model. The pinning points are considered to be centered in each unit cell of the superconducting lattice. This property enables one to use a discrete version of the XY model used in the simulations focusing on the melting of the Abrikosov lattice of vortices in a system of Josephson arrays. A Monte Carlo study performed on the corresponding Hamiltonian in a field given by a filling factor of f=1/2 exhibits two phase transitions, at the temperatures T$\text{}_{c1}$≈0.325 and T$\text{}_{m}$≈0.65. The numerical estimation of the Challa parameters for both transitions indicates their continuous nature. The physical meaning of the lower transition is the expulsion of the magnetic field from the superconducting system, i.e. the Meissner effect. The physical equivalent of the upper transition is the melting of the pinned vortex lattice.

Źródło:

Acta Physica Polonica A; 1997, 91, 2; 337-340
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Magnetic Ground State of Fullerenes

Autorzy:

Koper, A.
Stankowski, J.
Thomas, M.

Powiązania:

https://bibliotekanauki.pl/articles/1930574.pdf

Data publikacji:

1994-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.25.+z
36.40.+d

Opis:

The classical limit of the effective antiferromagnetic Heisenberg Hamiltonian has been investigated on the series of free clusters (molecules) of C$\text{}_{N}$ (N = 32, 44, 50, 58, 60,, 70 and 84). The valley structures of the frustrated ground states were determined. Moreover, the probability distributions of the spin correlation functions were calculated.

Źródło:

Acta Physica Polonica A; 1994, 85, 2; 351-355
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

On the Route to Chaos for Domain Walls with a Model of Stray Field

Autorzy:

Sukiennicki, A.
Kosiński, R. A.
Żebrowski, J. J.

Powiązania:

https://bibliotekanauki.pl/articles/1931285.pdf

Data publikacji:

1994-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.45.+b
75.10.Hk
75.60.Ch

Opis:

The route to chaos of domain wall in thin magnetic film, which is described by Słonczewski's equations of motion, is analyzed numerically. Hagedorn's model of surface stray field is applied. Ranges of periodic and chaotic wall motion as a function of constant in time, drive field are found. Comparison of results with those obtained for Hubert's model of the stray field is made.

Źródło:

Acta Physica Polonica A; 1994, 85, 5; 791-796
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Simple Quantitative Analysis of Spatio-Temporal Diagrams for Domain Wall Dynamics

Autorzy:

Kosiński, R. A.
Stępień, R.

Powiązania:

https://bibliotekanauki.pl/articles/1932111.pdf

Data publikacji:

1995-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.45.+b
75.10.Hk
75.60.Ch

Opis:

A quantitative analysis of spatio-temporal diagrams, which describe the dynamics of a chosen, spatially extended dynamic system (a domain wall in a thin magnetic garnet film) is presented. Two quantifiers characterizing such diagrams - a correlation function and power spectrum density function - were calculated using solutions of equations of motion. It was found that introducing these quantifiers to the analysis of spatio-temporal diagrams enables one to effectively characterize the type and the properties of motion of the considered system.

Źródło:

Acta Physica Polonica A; 1995, 87, 3; 575-583
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Stabilized 1D Metal in TTF(Ni(dmit)$\text{}_{2}$)$\text{}_{2}$ through Very Weak Coupling between Phonons and Weakly Correlated Fermions

Autorzy:

Doublet, M. L.
Malfant, I.
Hebrard, S.
Canadell, E.
Gaultier, J.
Chasseau, D.
Legros, J. P.
Brossard, L.

Powiązania:

https://bibliotekanauki.pl/articles/1933351.pdf

Data publikacji:

1995-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.Hk
71.45.Lr
61.66.Hq

Opis:

Extended Hückel band structure calculations derived from low temperature X-ray structural data, provide evidence, as temperature decreases, for an increasing 1D character of the multiparallel bands of the TTF(Ni(dmit)$\text{}_{2}$)$\text{}_{2}$ compound. This result is discussed within the monotonous metallic behaviour of the weakly correlated fermions gas, despite condensations of charge density wave instabilities.

Źródło:

Acta Physica Polonica A; 1995, 87, 4-5; 781-784
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 44.

Tytuł:

Spin Polarized Transport through Quantum Dots: Coulomb Blockade and Kondo Effect

Autorzy:

Barnaś, J.
Świrkowicz, R.
Wilczyński, M.
Weymann, I.
Martinek, J.
Dugaev, V.

Powiązania:

https://bibliotekanauki.pl/articles/2036886.pdf

Data publikacji:

2003-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.25.-b
73.23.Hk
72.15.Qm

Opis:

Spin related effects in electronic transport through quantum dots, coupled via tunneling barriers to two metallic leads, are discussed from the point of view of fundamental physics and possible applications in spin electronics. The effects follow either from long spin relaxation time in the dots or from spin dependent tunneling through the barriers when the external leads are ferromagnetic. In the former case large nonequilibrium spin fluctuations in the dot can be induced by flowing current. These fluctuations modify transport characteristics, particularly the shape of the Coulomb steps. In the latter case electric current depends on magnetic configuration of the system, and tunnel magnetoresistance effect due to magnetization rotation can occur. Transport properties in the weak coupling regime are described perturbatively in the first (sequential) and second (cotunneling) orders. In the strong coupling regime, on the other hand, the equation of motion for nonequilibrium Green functions is used to calculate electric current at low temperatures, where the Kondo peak in conductance is formed in the zero bias regime. In symmetrical systems the Kondo peak is split in the parallel magnetic configuration, whereas no splitting occurs for the antiparallel alignment. Theoretical results are discussed in view of available experimental data.

Źródło:

Acta Physica Polonica A; 2003, 104, 2; 165-177
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

On Mixed States Entanglement and Quantum Communication: Aspects of Quantum Channels Theory

Autorzy:

Horodecki, P.

Powiązania:

https://bibliotekanauki.pl/articles/2030474.pdf

Data publikacji:

2002-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.67.-a
03.65.Ca
03.67.Hk

Opis:

Basic aspects of quantum communication based on quantum channels theory are reviewed together with suitable examples. The key notion of quantum channel capacity is discussed. The role of mixed states entanglement as a practical tool in quantum channels theory is explained in detail. Application of recent results on non-positive partial transpose bound entanglement conjecture to binding entanglement channels shows that validity of the conjecture for some states implies nonadditivity of two-way quantum channel capacity. Some aspects of robustness of entanglement in context of positive maps theory are also discussed.

Źródło:

Acta Physica Polonica A; 2002, 101, 3; 399-424
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Monte Carlo Simulations of the Ashkin-Teller Model

Autorzy:

Dębski, L.

Powiązania:

https://bibliotekanauki.pl/articles/2013697.pdf

Data publikacji:

2000-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.40.Mg
64.70.-p

Opis:

Monte Carlo simulations are used to analyse the behaviour of the extended Ashkin-Teller model in two (2D) and three (3D) dimensions from the ratio of the square of the second moment of the order parameter to its fourth moment. The critical surface in three dimensional parameter space is calculated in regions where the Ising transitions are expected both for the ferro-and antiferromagnetic regions.

Źródło:

Acta Physica Polonica A; 2000, 97, 5; 859-862
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

The Cathodic Electrolytic Plasma Hardening of Steel and Cast Iron Based Automotive Camshafts

Autorzy:

Dayanç, A.
Karaca, B.
Kumruoğlu, L.

Powiązania:

https://bibliotekanauki.pl/articles/1030309.pdf

Data publikacji:

2017-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.65.Lp
82.45.Hk
81.40.Pq

Opis:

Cathodic electrolytic plasma hardening is a novel thermochemical surface modification and hardening process, used to increase wear resistance and surface hardness of metallic components in a local area of interest. The heating efficiency is related with the plasma nozzle design, applied current and electrolyte. The nozzle design is also a critical factor for the hardening of complex shapes, such as gears and camshafts. In this work, lobes of camshafts, fabricated from several cast iron and steel grades were hardened by cathodic electrolytic plasma hardening in aqueous carbonate electrolyte, using a specific plasma nozzle. The camshafts were attached to CNC lathe for turning them in the horizontal axis. In order to optimise heating and to achieve the ideal flowing and wetting by the electrolyte of the lobe case, the ceramic ellipse-shaped nozzle outlet was designed. As a result of preliminary studies, external surface of lobes was heated and subsequently quenched by electrolyte. The hardness of processed surface was in the range of 50-60 HRc for the different camshafts. No distortion was observed on the surface of lobes. Hardness depth was measured to be from 0.1 mm to 5 mm for several lobes.

Źródło:

Acta Physica Polonica A; 2017, 131, 3; 374-378
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Strongly Anisotropic S=1 (Pseudo) Spin Systems: from Mean Field to Quantum Monte-Carlo

Autorzy:

Panov, Yu.
Moskvin, A.
Konev, V.
Vasinovich, E.
Ulitko, V.

Powiązania:

https://bibliotekanauki.pl/articles/1030506.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.10.Jm
74.25.Dw

Opis:

The S=1 pseudospin formalism was recently proposed to describe the charge degree of freedom in a model high-T_{c} cuprate with the on-site Hilbert space reduced to the three effective valence centers, nominally Cu^{1+;2+;3+}. With small corrections the model becomes equivalent to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We have applied a generalized mean-field approach and quantum Monte-Carlo technique for the model 2D S=1 system to find the ground state phase with its evolution under deviation from half-filling and different correlation functions. Special attention is given to the role played by the on-site correlation ("single-ion anisotropy").

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 426-428
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 49.

Tytuł:

Catalytic Properties of Ni-Fe Systems in the Reaction of CO₂ Methanation at Atmospheric Pressure

Autorzy:

Meshkini-Far, R.
Dyachenko, A.
Gaidai, S.
Bieda, O.
Filonenko, M.
Ischenko, O.

Powiązania:

https://bibliotekanauki.pl/articles/1030898.pdf

Data publikacji:

2018-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

82.30.Hk
82.30.-b
82.20.-w

Opis:

Catalytic activity, phase composition, and morphology of binary Ni-Fe metallic systems in CO₂ hydrogenation were investigated. High methane yield was detected in the region of high Ni content, except the sample with 75% of Ni which has shown a sharp drop in activity. By means of scanning electron microscopy-energy dispersive X-ray and X-ray diffraction methods the differences in surface structuring of active (Ni₈₀Fe₂₀) and inactive (Ni₇₅Fe₂₅) catalysts were revealed. High methane yield for the former might be explained by defective porous superficial layer of catalyst grains, whereby for the latter the specific surface is diminished due to sintering.

Źródło:

Acta Physica Polonica A; 2018, 133, 4; 1088-1090
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 50.

Tytuł:

Structure and Catalytic Properties of Co-Fe Systems in the Reaction of CO₂ Methanation

Autorzy:

Zhludenko, M.
Dyachenko, A.
Bieda, O.
Gaidai, S.
Filonenko, M.
Ischenko, O.

Powiązania:

https://bibliotekanauki.pl/articles/1030910.pdf

Data publikacji:

2018-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

82.30.Hk
82.30.-b
82.20.-w

Opis:

The properties of Fe-Co catalysts in the reaction of CO₂ hydrogenation were investigated. Samples with high cobalt concentrations have shown higher activity. Morphology of the obtained catalysts was observed by using scanning electron microscopy and the elemental composition of surface of the catalysts was determined by scanning electron microscopy-energy dispersive X-ray method. Energy dispersive X-ray analysis showed that metal distribution is not homogeneous with various metal ratio in selected points of the surface for the Fe-rich less active samples, whereas for the Co-rich samples with higher activity metals are homogeneously distributed, which is possibly connected to the formation of single phase.

Źródło:

Acta Physica Polonica A; 2018, 133, 4; 1084-1087
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 51.

Tytuł:

Structure and Cathodoluminescence of Y₂O₃:Eu Thin Films obtained at Different Conditions

Autorzy:

Bordun, I.
Bordun, O.
Kukharskyy, I.
Tsapovska, Zh.

Powiązania:

https://bibliotekanauki.pl/articles/1030939.pdf

Data publikacji:

2018-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.37.Ps
78.60.Hk
81.15.-z

Opis:

The structure of the surface and spectra of the cathodoluminescence of Y₂O₃:Eu thin films when changing the activator concentration in the range 1.0-7.5% by mole obtained by RF sputtering were investigated. On the base of the shape of the cathodoluminescence spectra at different concentrations of the activator, the possibility of irregular solutions creating of yttrium and europium oxides and the structural features of the small and large crystallites forming the film Y₂O₃:Eu is shown. The dependence of the cathodoluminescence intensity on the energy of the exited electrons and current density of electron irradiation was established.

Źródło:

Acta Physica Polonica A; 2018, 133, 4; 914-917
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 52.

Tytuł:

Waiting Time Correlations in Transport through Two Coupled Quantum Dots

Autorzy:

Ptaszyński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1191206.pdf

Data publikacji:

2016-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.70.+m
73.23.Hk
73.63.Kv

Opis:

Waiting times between subsequent tunneling events in the double quantum dot system are shown to be correlated. The magnitude and the sign of the cross-correlation depend on the degree and the character of modulation of tunneling rates in the one dot due to the interaction with the charge state of the other, as well as on the relation between different time scales of the system dynamics.

Źródło:

Acta Physica Polonica A; 2016, 130, 5; 1233-1235
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 53.

Tytuł:

A New Approach for Transformer Cooling Systems: Application of Phase Change Materials (PCM)

Autorzy:

Buyukbicakci, E.
Temiz, I.
Edral, H.
Buyukbicakci, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1193859.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

84.71.Fk
82.30.Hk
07.20.Mc

Opis:

Cooling transformer materials are used for heat storage. In this study, phase change materials (PCM) were investigated in order to use them as alternative materials in cooling systems. PCM materials were tested and the results are presented. A transformer heating model was designed, heating spots were cooled down by application of PCM material to the model transformer. At the end of the study it was observed that heated phase change materials (PCM) kept cool during the same time period, compared to the control experiment.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1013-1015
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 54.

Tytuł:

Magnetic Properties of Multilayer Thin Film with Ising-Like Ordering

Autorzy:

Bîrsan, E.

Powiązania:

https://bibliotekanauki.pl/articles/1538722.pdf

Data publikacji:

2010-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.70.Ak
75.40.Mg

Opis:

In the last years, the study of the antiferromagnetic-ferromagnetic interfaces was a very exciting topic in the thin film area. Using the Monte Carlo technique (by applying the standard Metropolis algorithm) and the extended Heisenberg model with low dipolar interaction, the influence of the antiferromagnetic base layer on the magnetic properties of the multilayer thin film is investigated, in the ferromagnetic region of the phase diagram of the system. For each ferromagnetic layer individually, we study the physical quantities of interest (assuming particular physical conditions): the out-of-plane magnetization, the magnetic susceptibility and the specific heat and we point out the Ising-like ordering of the magnetic spins. The obtained numerical results show that the critical temperature of the individual layers decreases as we approach the base antiferromagnetic layer and consequently, the stability of the ferromagnetic phase increases with the distance from the base layer.

Źródło:

Acta Physica Polonica A; 2010, 117, 3; 500-505
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 55.

Tytuł:

Phonon-Assisted Electronic Transport through Double Quantum Dot System Coupled to Ferromagnetic Leads

Autorzy:

Trocha, P.
Rudziński, W.

Powiązania:

https://bibliotekanauki.pl/articles/1399105.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.25.Mk
73.23.Hk
73.63.Kv

Opis:

Phonon-assisted electronic tunneling is studied through a double quantum dot coupled in parallel to ferromagnetic electrodes. The current-voltage characteristics for the system are derived within the nonequilibrium Green function technique based on equation of motion. It is found that additional phonon-induced resonance peaks appear in the spectral function on both sides of the main resonances corresponding to the quantum dot energy levels. It is shown that the "molecular-like" resonances are reproduced in the phonon side bands in the differential conductance. A significant phonon-induced enhancement of tunnel magnetoresistance as well as tunnel magnetoresistance oscillations are also predicted.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 843-845
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Andreev Reflection in Transport through a Quantum Dot Coupled to Ferromagnetic and Superconducting Electrodes

Autorzy:

Bocian, K.
Rudziński, W.
Barnaś, J.

Powiązania:

https://bibliotekanauki.pl/articles/1427585.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.25.Mk
73.63.Kv
73.23.Hk

Opis:

Spin-dependent tunneling through a quantum dot coupled to one ferromagnetic and one superconducting electrodes is studied theoretically in the Andreev reflection regime. Electrical conductance is calculated in terms of the nonequilibrium Green function technique. Effects due to the Zeeman splitting of the dot level are analyzed in both linear and nonlinear transport regimes, and are compared with the corresponding effects due to coherent intradot spin rotation.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1201-1203
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 57.

Tytuł:

Non-Linear Thermal Current through Multilevel Quantum Dot Coupled to Ferromagnetic Electrodes

Autorzy:

Wierzbicki, M.
Świrkowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/1427586.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.Hk
73.50.Lw
85.80.Fi

Opis:

We present studies of spin-dependent phenomena in the non-linear energy transport through a multilevel quantum dot/molecule in the Coulomb blockade regime. Calculations are performed within the framework of non-equilibrium Green function formalism based on the equation of motion. Thermal current flowing through the system due to temperature gradient significantly varies with gate voltage. It depends on relative orientation of magnetic moments in the electrodes, so in analogy to tunneling magnetoresistance the magnetothermal conductance is introduced, which describes the effect.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1204-1206
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 58.

Tytuł:

The Effect of a Random Crystal-Field on the Mixed Ising Spins (1/2, 3/2)

Autorzy:

Bahmad, L.
Benayad, M.
Benyoussef, A.
El Kenz, A.

Powiązania:

https://bibliotekanauki.pl/articles/1504480.pdf

Data publikacji:

2011-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.50.+q
75.10.Hk
75.50.Gg

Opis:

We study the magnetic properties of a mixed Ising ferrimagnetic system, in which the two interacting sublattices have spins σ,(±1/2) and spins S,(±3/2,±1/2) in the presence of a random crystal field, with the mean field approach. The results obtained, using mean field approach and Monte Carlo simulation, show the appearance of a new ferrimagnetic phase, namely the partly ferrimagnetic phase ($m_{σ}$ = -1/2 , $m_{S}$ = +1). Consequently, three topologically different types of phase diagrams have been given by mean field approach. The effect of increasing the exchange interaction parameter J, at very low temperature is also investigated.

Źródło:

Acta Physica Polonica A; 2011, 119, 6; 740-746
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Gaussian Fluctuations of Two Molecular Fields in the Blume-Emery-Griffiths Model

Autorzy:

Jaworski, W.
Jacyna-Onyszkiewicz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1505093.pdf

Data publikacji:

2011-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Dg
75.10.Hk
75.10.Jm

Opis:

The Blume-Emery-Griffiths model for spins S=1 in a bilayer with z=5 nearest neighbours is studied with the use of Gaussian fluctuations approximation. The fluctuations of two molecular fields, connected with two order parameters, are introduced. Their influence on phase diagrams for non-negative values of the biquadratic coupling constant is taken under consideration. The results are compared with those obtained by the mean-field approximation and discussed.

Źródło:

Acta Physica Polonica A; 2011, 119, 6; 846-849
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

MBE Growth and Characterization of a III-V Distributed Bragg Reflectors and InAs Quantum Dots

Autorzy:

Rousset, J.
Słupinski, T.
Jakubczyk, T.
Kobak, J.
Stawicki, P.
Gołasa, K.
Babinski, A.
Nawrocki, M.
Pacuski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1403611.pdf

Data publikacji:

2012-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ci
78.67.Pt
68.37.Hk

Opis:

We describe the realization and characterization of a distributed Bragg reflectors and InAs quantum dots grown by molecular beam epitaxy. The distributed Bragg reflectors are based on a stack of eight or twenty pairs of GaAs and AlAs layers with a stopband centered at about E_0=1.24 eV (λ_0=1000 nm). The whole structures exhibit a reflectivity coefficient above 90%. The growth rate was monitored in situ by measurement of the oscillations of the thermal emission intensity. The investigations conducted on the InAs quantum dots grown on GaAs show photoluminescence around E=1.25 eV (λ=990 nm). The combination of these two elements results in the realization of a microcavity containing InAs quantum dots and surrounded by 20 pairs of distributed Bragg reflectors.

Źródło:

Acta Physica Polonica A; 2012, 122, 6; 984-987
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Influence of Zn on Structure and Magnetic Properties of Rapid Quenched (Fe-Zn)-Cu-Nb-Si-B Alloys

Autorzy:

Kolesar, V.
Michalik, S.
Kovac, J.
Girman, V.
Sovak, P.
Kollar, P.

Powiązania:

https://bibliotekanauki.pl/articles/1533958.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.Hk
75.50.Bb
75.75.Cd

Opis:

The aim of this work was to study the influence of Zn on the formation of nanostructure in $Fe_{73.5 - x}Zn_xCu_1Nb_3Si_{13.5}B_9$ (x = 1, 3, 5) ribbons prepared by the melt-spinning technique. X-ray diffraction measurements proved amorphous state of the sample with x = 1. The sample with x = 3 contains a small fraction of Fe_3Si phase and the sample with x = 5 is in nanocrystalline state with the average grain size of about 25 nm. The reduced radial distribution function G(r) was calculated for local structure investigation. Increasing Zn content enhances crystallization during solidification which leads to increase of magnetocrystalline anisotropy and consequently to increase of coercivity.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 790-791
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Cathodoluminescence Profiling for Checking Uniformity of ZnO and ZnCoO Thin Films

Autorzy:

Witkowski, B. S.
Łukasiewicz, M. I.
Wolska, E. A.
Kopalko, K.
Kowalski, B. J.
Guziewicz, E.
Godlewski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2048105.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.15.Gh
78.30.Fs
78.60.Hk

Opis:

We employ scanning electron microscopy and cathodoluminescence for evaluation of uniformity of ZnCoO films obtained by the atomic layer deposition. Cathodoluminescence quenching by Co ions allows us to detect (regions of weaker light emission) Co accumulations, with the resolution limited by diffusion length of secondary carriers.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 675-677
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Numerical Simulations of Linear S=1 Ferro- and Antiferromagnets

Autorzy:

Kamieniarz, G.
Matysiak, R.
Caramico D'Auria, A.
Esposito, F.
Esposito, U.

Powiązania:

https://bibliotekanauki.pl/articles/1964696.pdf

Data publikacji:

1997-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

64.60.-i
75.10.Hk
75.40.Mg

Opis:

The finite-temperature static properties of the spin S=1 antiferromagnetic Heisenberg chains are extensively simulated using the quantum transfer matrix method. The zero-field susceptibility and specific heat as well as the field-dependent magnetization data are evaluated to select the microscopic parameters of a number of real quasi-one-dimensional compounds and to verify some theoretical approaches.

Źródło:

Acta Physica Polonica A; 1997, 92, 2; 387-389
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Improved Phase Diagrams of Ashkin-Teller Model

Autorzy:

Pawlicki, P.
Kamieniarz, G.
Kozlowski, P.
Dekeyser, R.
Rogiers, J.

Powiązania:

https://bibliotekanauki.pl/articles/1964805.pdf

Data publikacji:

1997-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.40.Mg
75.10.Hk
64.60.Ak

Opis:

The phase diagram of the Askhin-Teller model in two dimensions is determined. Numerical calculations are performed for the simple square L × L lattice using transfer matrix technique. Exploiting finite-size scaling all unknown critical lines were obtained with good accuracy. An extended version of the Ashkin-Teller model is also considered within the molecular field renormalization group method and the critical surface for three-parameter odd-parity Hamiltonian is calculated.

Źródło:

Acta Physica Polonica A; 1997, 92, 2; 453-456
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Effect of Annealing Time on Structure of $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ Alloy

Autorzy:

Nemcová, V.
Girman, V.
Hrabčáková, V.
Michalik, Š.
Bednarčík, J.
Almáši, M.
Sovák, P.

Powiązania:

https://bibliotekanauki.pl/articles/1367403.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.05.cp
61.46.Hk
61.05.J-

Opis:

The process of a primary crystallization of the $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ alloys was investigated by differential thermal analysis (DTA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). Amorphous ribbons were isothermally annealed for 0.5, 2, 6, 30 and 150 minutes at 520 °C. Both, the XRD and TEM study showed that the level of devitrification of the sample increases with the annealing time. The above mentioned techniques confirmed the presence of the nanocrystalline grains of the $Fe_{3}Si$ phase and enable us to study the evolution of the identified phase.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 116-117
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Monte Carlo Study on Induced Antiferromagnetic Phase in Bilayer Films Using Anisotropic Extended Heisenberg Model

Autorzy:

Birsan, E.
Chis, R.
Dobrita, A.

Powiązania:

https://bibliotekanauki.pl/articles/1812450.pdf

Data publikacji:

2008-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.70.Ak
75.40.Mg

Opis:

In this paper we study the magnetic bearing of a bilayer film in anisotropic extended Heisenberg model, using the Monte Carlo method. In this way, by computing the out-of-plane uniform and staggered magnetization, in-plane uniform magnetization, out-of-plane and in-plane magnetic susceptibility, we point out the existence of an antiferromagnetic phase induced in the superior layer as a consequence of the fixed ferromagnetic arrangement of the spins in the base layer. We can also distinguish the existence of two phase transitions which occur in the physical system: antiferromagnetism → mixed phase transition and antiferromagnetism → XY-like phase transition, corresponding to the two physical parameter settings.

Źródło:

Acta Physica Polonica A; 2008, 113, 6; 1701-1707
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Ground-State Phase Diagram of Geometrically Frustrated Ising-Heisenberg Model on Doubly Decorated Planar Lattices

Autorzy:

Čanová, L.
Strečka, J.
Dely, J.
Jaščur, M.

Powiązania:

https://bibliotekanauki.pl/articles/1813794.pdf

Data publikacji:

2008-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.50.+q
75.10.Hk
75.10.Jm

Opis:

Ground-state phase diagram of the mixed spin-1/2 and spin-1 Ising-Heisenberg model on doubly decorated planar lattices is examined using the generalized decoration-iteration transformation. The main attention is devoted to the comparison of the ground-state properties of the quantum Ising-Heisenberg model and its semi-classical Ising analogue.

Źródło:

Acta Physica Polonica A; 2008, 113, 1; 449-452
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Current-Induced Magnetic Dynamics in Asymmetric Ferromagnetic Single-Electron Devices

Autorzy:

Kowalik, M.

Powiązania:

https://bibliotekanauki.pl/articles/1810537.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.25.-b
73.23.Hk
85.75.-d

Opis:

The theoretical calculations of possible dynamics for a localized magnetic moment of the central electrode in ferromagnetic single-electron devices are presented. The spin-transfer torque from spin current absorbed by the central electrode is calculated. Thereafter, an in-plane component of spin torque is regarded during the integration of the Landau-Lifshitz-Gilbert equation and the time evolution of the localized magnetic moment of the central electrode is obtained. The necessary conditions for switching of the magnetic moment are discussed.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 290-292
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Cotunneling Transport at Singlet-Triplet Transition in Carbon Nanotube Quantum Dots

Autorzy:

Ilnicki, G.
Moriyama, S.
Martinek, J.
Fuse, T.
Ishibashi, K.

Powiązania:

https://bibliotekanauki.pl/articles/1810544.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.22.-f
73.23.Hk
73.63.Fg

Opis:

Electronic transport through a quantum dot in the Coulomb-blockade cotunelling regime is investigated both experimentally and theoretically, where a single-wall carbon-nanotube weakly coupled to metallic leads plays a role of the dot. We observe a pronounced current peak for the singlet-triplet transition in a half-shell filling regime due to inelastic cotunneling processes. Using the second order perturbation theory we explain physical mechanisms determining the details of signal.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 299-302
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Analysis of the Kondo Resonance in a Single Quantum Dot Asymmetrically Coupled to Ferromagnetic Electrodes with Non-Collinear Magnetizations

Autorzy:

Wawrzyniak, M.

Powiązania:

https://bibliotekanauki.pl/articles/1810546.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.15.Qm
73.21.La
73.23.Hk

Opis:

The Kondo effect is studied theoretically in the framework of the non-equilibrium Green function formalism. The system under consideration consists of a single quantum dot asymmetrically coupled to ferromagnetic electrodes, whose magnetic moments are non-collinear. The spin-dependent density of states, as well as the transport characteristics such as differential conductance and tunneling magnetoresistance through the system are obtained using the equation of motion method. Numerical illustration of the mentioned quantities for several magnetic configurations and coupling strengths is presented and discussed.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 303-305
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

The Magnetic Field Effects on Spin Polarization of T-Shaped Double Quantum Dots Coupled to Ferromagnetic Leads

Autorzy:

Wójcik, K.
Weymann, I.

Powiązania:

https://bibliotekanauki.pl/articles/1384834.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.Hk
73.63.Kv
85.75.-d

Opis:

We analyze the spin-dependent conductance and spin polarization of a double quantum dot in a T-shape configuration coupled to ferromagnetic leads in the presence of external magnetic field. The calculations are performed with the aid of the numerical renormalization group method. We show that in the antiparallel configuration, finite magnetic field can give rise to the full spin polarization of the current, which can be controlled by tuning the dots' levels. On the other hand, for parallel configuration enhanced spin polarization can be generated by an exchange field due to the presence of ferromagnetic leads and can be also tuned by changing level position or external magnetic field. The magnetic field can be thus used to improve the spin-resolved properties of the system.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 222-224
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Arbitrarily Weak First Order Phase Transitions in the 3D Standard Ashkin-Teller Model by MC Computer Experiments

Autorzy:

Jeziorek-Knioła, D.
Musiał, G.
Wojtkowiak, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1385525.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.30.Kz
75.40.Mg

Opis:

The first order phase transition line in the vicinity of the tricritical Ising point region is studied in the 3D standard Ashkin-Teller model on a cubic lattice. The large-scale Monte Carlo computer experiments using the Binder- and Challa-like cumulants, the latter modified by Musial, are proposed and performed. Specific behavior of the Challa-Musial cumulants for weak first order phase transitions is discovered and its interpretation is proposed. The paper proves the arbitrarily weak first order character of phase transitions when approaching to the Ising point.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 327-329
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides

Autorzy:

Prochazka, I.
Cizek, J.
Melikhova, O.
Konstantinova, T.
Danilenko, I.

Powiązania:

https://bibliotekanauki.pl/articles/1338541.pdf

Data publikacji:

2014-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Wx
61.46.Hk
78.70.Bj

Opis:

Positron lifetime and coincidence Doppler broadening measurements on $ZrO_2$+3 mol.% $RE_2O_3$ (RE = Eu, Gd, Lu) nanopowders and ceramics obtained by sintering these nanopowders are reported. The initial nanopowders were prepared by a co-precipitation technique and exhibited a mean particle size of ≈ 15 nm. The nanopowders were calcined and pressure-compacted. All compacted nanopowders exhibited the prevailing tetragonal phase with at most 15% of the monoclinic admixture. Positrons in compacted nanopowders were found to annihilate almost exclusively at grain boundaries: (i) vacancy-like misfit defects along grain boundaries and (ii) larger defects situated at intersections of grain boundaries (triple points). In nanopowders, a small portion of positrons formed positronium in pores between crystallites. Sintering of nanopowders at 1500C caused a substantial grain growth and formation of ceramics. Sintering-induced grain growth led to a disappearance of the triple points and pores. The ceramics containing Eu and Gd dopants consist of mixture of the monoclinic and the tetragonal phase, while the ceramics with Lu dopant exhibits almost exclusively the tetragonal phase.

Źródło:

Acta Physica Polonica A; 2014, 125, 3; 760-763
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Microstructure and High Temperature Oxidation Properties of Fe-Cr-Ni HK30 Alloy Manufactured by Metal Injection Molding

Autorzy:

Wi, Dong-Yeol
Kim, Young-Kyun
Yoon, Tae-Sik
Lee, Kee-Ahn

Powiązania:

https://bibliotekanauki.pl/articles/356708.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metal injection molding
HK30
microstructure
high temperature oxidation

Opis:

This study investigated the microstructure and high temperature oxidation properties of Fe-25Cr-20Ni-1.5Nb, HK30 alloy manufactured by metal injection molding (MIM) process. The powder used in MIM had a bi-modal size distribution of 0.11 and 9.19 μm and had a spherical shape. The initial powder consisted of γ-Fe and Cr₂₃C₆ phases. Microstructural observation of the manufactured (MIMed) HK30 alloy confirmed Cr₂₃C₆ along the grain boundary of the γ-Fe matrix, and NbC was distributed evenly on the grain boundary and in the grain. After a 24-hour high temperature oxidation test at air atmospheres of 1000, 1100 and 1200°C, the oxidation weight measured 0.72, 1.11 and 2.29 mg/cm², respectively. Cross-sectional observation of the oxidation specimen identified a dense Cr₂O₃ oxide layer at 1000°C condition, and the thickness of the oxide layer increased as the oxidation temperature increased. At 1100°C and 1200°C oxidation temperatures, Fe-rich oxide was also formed on the dense Cr₂O₃ oxide layer. Based on the above findings, this study identified the high-temperature oxidation mechanism of HK30 alloy manufactured by MIM.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 525-530
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

HK121 i HK416C w Hammelburgu

Autorzy:

Wilk, Remigiusz.

Powiązania:

Raport. Wojsko - Technika - Obronność 2010, nr 10, s. 64-65

Data publikacji:

2010

Tematy:

Broń strzelecka budowa i konstrukcje Niemcy
Heckler & Koch HK416 (karabinek) dane taktyczno-techniczne Niemcy
HK121 (karabin) dane taktyczno-techniczne Niemcy

Opis:

Fot.

Dostawca treści:

Bibliografia CBW

/5

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Skocz do pozycji: 76.

Tytuł:

Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects

Autorzy:

Popovych, V.D.
Kuzma, M.
Skop, N.
Stefaniuk, I.
Cieniek, B.

Powiązania:

https://bibliotekanauki.pl/articles/1030219.pdf

Data publikacji:

2017-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.72.-y
68.37.Hk
76.50.+g

Opis:

We study CdTe:Cr single crystals grown by the physical vapor transport method from pre-synthesized (Cd,Cr)Te alloys with 5 at.% of chromium nominal content. Macrodefects in the form of (111)-oriented thin platelets of dopant-related second phases were detected by scanning electron microscopy patterning of the chemically treated surfaces of the crystals. Magnetic properties of the crystals were investigated by ferromagnetic resonance using X-band Bruker spectrometer (9.43 GHz). Their ferromagnetic resonance spectra show several broad lines, which position depends on the orientation of the sample in relation to the external magnetic field in spectrometer. The angular dependences of ferromagnetic resonance spectra are interpreted in the frame of shape anisotropy of ferromagnetic resonance of the planar defects embedded in a weak magnetic CdTe matrix.

Źródło:

Acta Physica Polonica A; 2017, 132, 1; 34-38
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Noise Enhancement due to Telegraphic Switching in a Two-Level Quantum Dot Coupled to Spin-Polarized Leads

Autorzy:

Ptaszyński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1030411.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.70.+m
73.23.Hk
73.63.Kv

Opis:

Current fluctuations in a two-level quantum dot coupled to the spin-polarized leads are studied by means of the Markovian master equation. It is shown, that transitions between spin configurations of the system cause switching between different current channels, which generates the super-Poissonian noise enhancement and the correlation between subsequent waiting times separating the successive tunneling events.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 526-528
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Computation of Latent Heat based on the Energy Distribution Histogram in the 3D Ashkin-Teller Model

Autorzy:

Jeziorek-Knioła, D.
Wojtkowiak, Z.
Musiał, G.

Powiązania:

https://bibliotekanauki.pl/articles/1030435.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.30.Kz
75.40.Mg

Opis:

The method of computation of the latent heat based on the energy distribution histogram is applied to the standard 3D Ashkin-Teller (AT) model. Similarly as in the original method for the q-state Potts model for strong first order phase transitions, the characteristic histogram with two peaks in the critical region have been observed. Positions of two minima of negative logarithm of internal energy probability for samples of finite size show good linear scalability to the thermodynamic limit. The applicability of this method has been confirmed by proving that the latent heat values are consistent with the ones obtained by us using the analysis of the behavior of the cumulants of the type of Challa and of Lee-Kosterlitz. The presented method is far more efficient than the one based on those cumulants.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 435-437
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Collinear and Non-Collinear Configurations in Classical Geometrically Frustrated Ring-Shaped Systems

Autorzy:

Grajek, M.
Kopyciuk, T.
Florek, W.
Marlewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1030818.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Jm
75.10.Hk
75.50.Xx

Opis:

Geometrically frustrated quantum spin systems, with competing antiferromagnetic couplings, show the Kahn degenerate frustration for some specific values of Heisenberg Hamiltonian parameters. It has been recently shown for rings with a defect bond and centered rings. In the case of classical counterparts of these systems, degenerated configurations with the lowest energy are present for the energy function parameter greater than a certain threshold. In these domains such configurations are planar but non-collinear with continuous changes of the net magnetic moment with respect to the Hamiltonian parameter. Outside these domains there is unique collinear ground state configuration (neglecting choice of the net magnetic moment direction). However, these collinear configurations are the same in both non-frustrated and geometrically frustrated domains. Numerically exact calculations for quantum systems strongly confirm that determined properties of their classical counterparts realize the classical limit s→∞.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 417-419
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Kinetics of Solid-State Synthesis of Quaternary Cu₂FeSnS₄ (Stannite) Nanocrystals for Solar Energy Applications

Autorzy:

Baláž, P.
Baláž, M.
Zorkovská, A.
Škorvánek, I.
Bujňáková, Z.
Trajić, J.

Powiązania:

https://bibliotekanauki.pl/articles/1032135.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
81.05.Hd
61.46.Hk

Opis:

In this study we demonstrate the use of elemental precursors (Cu, Fe, Sn, S) to obtain stannite forms by a solid-state one-pot mechanochemical synthesis. In the processing route, we report the kinetics of the synthesis. For the characterization of the unique nanostructures, X-ray diffraction, specific surface area measurements and SQUID magnetometry methods were applied. CFTS polymorphs with the tetragonal body-centered structure with the average crystallite size 18-19 nm were obtained. The weak ferromagnetic properties of the quaternary nanocrystals after maximum milling time were also documented.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 1153-1155
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Theoretical Study of the Frustrated Ising Antiferromagnet on the Honeycomb Lattice

Autorzy:

Bobák, A.
Lučivjanský, T.
Žukovič, M.
Borovský, M.
Balcerzak, T.

Powiązania:

https://bibliotekanauki.pl/articles/1032632.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

05.50.+q
05.70.-a
75.10.Hk

Opis:

We study effects of the next-next-nearest-neighbour antiferromagnetic (J₃ < 0) interaction on critical properties (or phase diagram) of the frustrated spin-½ J₁-J₂-J₃ Ising antiferromagnet on the honeycomb lattice by using the effective-field theory with correlations. Beside the ground-state energy, we find that there is a region of J₃ < 0 in which the frustrated honeycomb lattice antiferromagnet exhibits a tricritical point, at which the phase transition changes from the second order to the first one on the line between Néel antiferromagnetic and paramagnetic phases.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 636-638
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Preparation and Phase Transformation of Mullite-Zirconia from Boehmite and Algerian Halloysite

Autorzy:

Raghdi, A.
Heraiz, M.
Sahnoune, F.
Ouali, A.
Redaoui, D.

Powiązania:

https://bibliotekanauki.pl/articles/1033372.pdf

Data publikacji:

2017-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Mh
68.37.hk
07.85.Nc

Opis:

In this work, mullite-zirconia composite were fabricated by reaction sintering of Algerian halloysite Al₂Si₂O₅(OH)₄, boehmite Al(OOH), and zirconia (ZrO₂) powder using conventional heating. The appropriate amount of the three raw powders was ball milled for 5 h and sintered between 1250 and 1650°C for 2 h. A scanning electron microscope was used to characterize the microstructure of sintered samples. A dilatometer and X-ray diffractometer were used to analyze the formation and transformation of phases. It is found that for the addition of zirconia up to 20wt.% the zirconia phase retains its tetragonal structure. The formation of primary mullite in all samples was complete at 1220°C. The cristobalite started to form at 1350°C, and disappeared at 1500°C in the samples of mullite, and at 1450°C when ZrO₂ was added. The zircon compound ZrSiO₄ started to form at 1350°C and completely disappeared at 1550°C. The increase in ZrO₂ ratio promoted the formation of grains with a spherical shape.

Źródło:

Acta Physica Polonica A; 2017, 131, 1; 136-138
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Positronium Probing of Pores in Zirconia Nanopowders

Autorzy:

Prochazka, I.
Cizek, J.
Lukac, F.
Melikhova, O.
Hruska, P.
Anwand, W.
Liedke, M.
Konstantinova, T.
Danilenko, I.

Powiązania:

https://bibliotekanauki.pl/articles/1033930.pdf

Data publikacji:

2017-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Wx
61.46.Hk
78.70.Bj

Opis:

In the present paper, conventional positron lifetime measurements on selected zirconia-based nanopowders are reported. The nanopowders were doped with various metal cations (Y³⁺, Eu³⁺, Gd³⁺, Lu³⁺ and Mg²⁺). Lifetime experiments were conducted in air and supplemented with mass density measurements. In a range of lifetimes, from a few ns to ≈70 ns, up to two individual lifetime components could be identified. Such observations confirmed positronium (Ps) formation with subsequent ortho-Ps pick-off annihilation as well as the occurrence of pores of different size. Pore sizes were estimated using a shape-free model of the correlation between pore size and ortho-Ps lifetime. The origins of pores are discussed on the basis of the ortho-Ps data in combination with the results of mass density measurements.

Źródło:

Acta Physica Polonica A; 2017, 132, 5; 1564-1567
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Irreducible green functions method applied to nanoscopic systems

Autorzy:

Górski, G.

Powiązania:

https://bibliotekanauki.pl/articles/1062052.pdf

Data publikacji:

2016-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.63.Kv
73.23.Hk
74.45.+c

Opis:

The equation of motion method for the Green functions is one of the tools used in the analysis of quantum dot system coupled with the metallic and superconducting leads. We investigate modified equation of motion, based on differentiation of double-time temperature dependent Green functions both over the primary time t and secondary time t'. Our equation of motion approach allows us to obtain the Abrikosov-Suhl resonance in the particle-hole symmetric case and also in the asymmetric cases. We will apply the irreducible Green functions technique to analyses of the equation of motion applied to the dot system. This method gives a workable decoupling scheme breaking the infinite set of the Green function equations. We apply this technique to calculate the density of the states and the differential conductance of single-level quantum dot with the Coulomb repulsion attached to one metallic and one superconducting leads (N-QD-SC). Our results are compared with the previous calculations.

Źródło:

Acta Physica Polonica A; 2016, 130, 2; 551-553
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

Anodic oxide films on niobium and tantalum in different aqueous electrolytes and their impedance characteristics

Autorzy:

Verma, N.
Singh, K.
Marí, B.
Mollar, M.
Jindal, J.

Powiązania:

https://bibliotekanauki.pl/articles/1075354.pdf

Data publikacji:

2016-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.37.Hk
68.55.J-
68.60.Bs

Opis:

The anodic oxide films were prepared on the niobium and tantalum in aqueous electrolyte mixtures containing 1 M CH₃COOH + 1 M H₃PO₄ or 1 M CH₃COOH + 1 vol.% HF or 1 M CH₃COOH + 1 M H₃PO₄ + 1 vol.% HF at 30 V for 30 min. The barrier films were obtained on both niobium and tantalum surfaces in all electrolyte mixtures except niobium oxide film formed in 1 M CH₃COOH + 1 vol.% HF which is porous in nature. The anodic oxide films were characterized by FESEM. Also, electrochemical impedance spectroscopy at open-circuit potential on Nb and Ta was applied and obtained data were analyzed by fitting with four different equivalent circuits.

Źródło:

Acta Physica Polonica A; 2016, 129, 3; 297-303
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Electrolytic Plasma Surface Cleaning of Industrial Metallic Components

Autorzy:

Kumruoglu, L.
Özel, A.

Powiązania:

https://bibliotekanauki.pl/articles/1194881.pdf

Data publikacji:

2014-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.65.Kn
82.45.Qr
82.45.Hk

Opis:

Electrolytic plasma is an emerging, environmentally friendly surface engineering technology that can be used for cleaning of metal surfaces and removing several coating. The present work was concerned with cleaning of corrosion products (oxides and contamination) on steel surfaces for corrosion protection. The effects of processing parameters on cleaning steel surfaces were investigated. The results show that electrolytic plasma can effectively produce clean surfaces and remove iron oxides. Also the arc spray coatings deposited on steel was removed by electrolytic plasma.

Źródło:

Acta Physica Polonica A; 2014, 125, 2; 379-381
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Effects of Microstructural Transformation in TBCs Consisting of NiCrAlY Metallic Bond Coat and YSZ Ceramic Top Coat after Oxidation at 900°C

Autorzy:

Parlakyigit, A.
Karaoglanli, A.

Powiązania:

https://bibliotekanauki.pl/articles/1194952.pdf

Data publikacji:

2014-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.35.Fx
68.37.Hk
81.15.Rs

Opis:

Thermal barrier coatings are applied to aeronautical and industrial gas turbine components to protect from detrimental effects of hot gases. Thermal barrier coating systems are generally composed of a substrate material, an oxidation resistant metallic bond coat, and a thermal protective ceramic-based topcoat. Additionally, thermally grown oxide layer is formed at ceramic/bond coat interface as a result of exposure of bond coat to high temperature. Oxidation mechanism is one of the major failure mechanisms of thermal barrier coatings. Thermally grown oxide layer plays significant role as a oxygen barrier, but rapid thickening of thermally grown oxide leads to spallation failure of thermal barrier coatings. In this study, thermally grown oxide growth behavior was investigated at isothermal oxidation condition to evaluate durability of the thermal barrier coating system. The thermal barrier coating system consists of yttria stabilized zirconia (YSZ) topcoat and NiCrAlY bond coat deposited on Inconel 718 superalloy with atmospheric plasma spray technique. After coating process, specimens were exposed to 900C air atmosphere for different periods up to 50 h. Ceramic/bond coat interface and thermally grown oxide layer were examined using scanning electron microscopy analysis. Besides, porosity contents and microhardness measurements were carried out to determine strength of coating. The results showed that thickness of thermally grown oxide layer increased and porosity rates of ceramic layer decreased with the effect of oxidation. Accordingly, the ceramic layer hardness increased due to high temperature effect.

Źródło:

Acta Physica Polonica A; 2014, 125, 2; 232-234
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Thermoelectric Transport through the Double Quantum Dot in the Sequential Tunneling Regime

Autorzy:

Szukiewicz, B.
Wysokiński, K.

Powiązania:

https://bibliotekanauki.pl/articles/1195458.pdf

Data publikacji:

2014-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.-b
73.63.Kv
73.23.Hk

Opis:

The charge and spin thermoelectric transport in the system composed of a central molecule in contact with two normal electrodes in an external magnetic field of the Zeeman type have been studied. Such system can support pure spin current for applications in spintronics. By appropriate gate tuning of each of the dots it is possible to electrically control the direction of the spin current or tune the device operating as a thermoelectric generator to optimal performance.It has been shown that the device is poor energy converter in the parameter region where its thermoelectric figure of merit attains very large values.

Źródło:

Acta Physica Polonica A; 2014, 126, 5; 1159-1162
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Orientation mapping and in situ annealing applied for characterization of changes in aluminium alloys after deformation

Autorzy:

Bieda, M.

Powiązania:

https://bibliotekanauki.pl/articles/1075659.pdf

Data publikacji:

2016-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.37.Hk
81.40.Lm
81.70.-q

Opis:

The paper presents application of combined in situ annealing and orientation mapping technique for investigation the microstructural changes in the aluminium alloy 6013 with bimodal distribution of the second phase particles during recovery and recrystallization processes. Information about grain distribution, misorientation between grains, size and shape of the grains at each stage of recrystallization process were obtained. Complexity of the experimental procedure is defined and discussed in order to avoid artificial results. Although the article described the advantages and disadvantages of those method used in transmission electron microscopy and scanning electron microscopy in the work the results from scanning electron microscopy/electron backscattering diffraction in situ heating experiments are highlighted. Obtained data are in a good agreement with previous transmission electron microscopy and calorimetry studies.

Źródło:

Acta Physica Polonica A; 2016, 130, 4; 979-981
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Characterization of Nitinol Powder Produced by Reduction of Oxides by Calcium Hydride

Autorzy:

Sviridova, T.
Shuytcev, A.
Kasimtcev, A.
Markova, G.

Powiązania:

https://bibliotekanauki.pl/articles/1402065.pdf

Data publikacji:

2015-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.20.Ev
61.05.cp
68.37.Hk

Opis:

Several techniques were used to investigate the chemical and phase composition of four trial batches of nitinol powder produced by calciothermic reduction as well as their morphology and granulometric composition. Almost all powders produced by a similar procedure contained an allowable amount of impurities and were practically free of minor detrimental phases such as Ti₂Ni and Ni₃Ti. The powders under study have gamma or lognormal particle size distributions and spongy particles morphology typical of this production method. The tap density over 3g/cm³ was achieved at least in one case, which gives us an opportunity to successfully produce bulk articles by subsequent treatments such as sintering or hot isostatic pressing.

Źródło:

Acta Physica Polonica A; 2015, 128, 4; 510-513
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Translating Concepts of State Transfer to Spin-1 Chains

Autorzy:

Wieśniak, M.
Dutta, A.
Ryu, Junghee

Powiązania:

https://bibliotekanauki.pl/articles/1402299.pdf

Data publikacji:

2015-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.65.Aa
03.67.-a
03.67.Hk

Opis:

State transfer is a well-known routine for various systems of spins-1/2. Still, it is not well studied for chains of spins of larger magnitudes. In this contribution we argue that while perfect state transfer may seem unnatural in spin-1 systems, it is still feasible for arrays of V-type three-level atoms. Tomography of such 1D array is also shown to be possible by acting on one atom from such an array.

Źródło:

Acta Physica Polonica A; 2015, 128, 1; 3-5
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Improved Performance and Spectral Features of Complex Porous Silicon Structure Containing Silicon Solar Cells

Autorzy:

Shatkovskis, E.
Mitkevičius, R.
Zagadskij, V.
Stupakova, J.

Powiązania:

https://bibliotekanauki.pl/articles/1417931.pdf

Data publikacji:

2012-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.43.Gt
68.37.Hk
72.40.+w

Opis:

This work presents porous silicon technology, adapted to improve the characteristics of monocrystalline silicon solar cell. This is achieved by taking advantage of properties provided by porous silicon technology in production of diverse structures in the material. We produce a porous silicon derivative, which is mostly hidden in the emitter of solar cell. Research of the initial and modified solar cells was made by measuring current-voltage characteristics under illumination of a 5000 K xenon lamp. Spectrally resolved studies of current-voltage characteristics were carried out using radiation of halogen lamps and diffraction grating monochromator. Studies revealed that the manufacturing of buried porous silicon structure improves solar cell performance by increasing the fill factor of the modified solar cell current-voltage characteristics, maximum output power and efficiency, when compared to unmodified ones. Spectral studies revealed that the above-mentioned improvement differs for various sections of light spectrum. Largest relative enhancement of solar cell current was observed at the wavelengths of Δ λ = 450-550 nm. We consider the cumulative result of several effects resulting in solar cell efficiency enhancement. Most of them were the influence of porosity on effective optical path length and better anti-reflecting properties of multiple porous structures.

Źródło:

Acta Physica Polonica A; 2012, 122, 6; 1121-1124
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Novel Approach for Energy Spectrum Probing in Semiconducting Quantum Dots

Autorzy:

Zdrojek, M.
Wąsik, M.
Esplandiu, M.
Bachtold, A.

Powiązania:

https://bibliotekanauki.pl/articles/1419526.pdf

Data publikacji:

2012-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.22.Dj
73.23.Hk
73.63.Kv

Opis:

A new technique has been used to probe the electronic properties of quantum dots. Here we discuss the case of semiconducting CdSe dots. This technique allows us to fill (or empty) semiconducting quantum dot with many electrons. The detection scheme is based on an original approach where the investigated particle is attached to only one electrode, a carbon nanotube. The conductance of the nanotube is measured as a function of a gate voltage $(V_{g}),$ which allows the detection of individual electrons transferred onto the quantum dot. For certain range of $V_{g}$ we noticed no electron transfer which is attributed to the energy gap of the CdSe quantum dot. Our study shows that single-electron detection with carbon nanotube transistor represents a new strategy to study the separation between the electronic discrete energy levels of the semiconducting quantum dot.

Źródło:

Acta Physica Polonica A; 2012, 122, 2; 321-323
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

The Effects of the Random Transverse Crystal Field on the Spin-1 Model

Autorzy:

Albayrak, E.

Powiązania:

https://bibliotekanauki.pl/articles/1399269.pdf

Data publikacji:

2015-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.10.Hk
75.30.Kz
75.50.Gg

Opis:

The effects of random transverse crystal field are investigated in the mean-field approximation on the spin-1 model. The transverse crystal field is applied on a lattice in a bimodal random distribution with a tunable parameter adjusting the strength of one mode with respect to the other one. Then, the phase diagrams are calculated on the reduced temperature-transverse crystal field planes for given values of probability p and coordination number q at zero external magnetic field h. It was found that the model gives both second- and first-order phase transitions and tricritical points which is a well-known behavior of the spin-1 model. In addition, the model also yields critical end points and end points for the first-order phase transition lines for appropriate p values.

Źródło:

Acta Physica Polonica A; 2015, 127, 3; 818-822
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

The Effect of Carbon Coating on the Electrochemical Performance of Nanosized $Li_2FeSiO_4$ Cathode Materials

Autorzy:

Wang, Y.
Su, D.
Wang, G.

Powiązania:

https://bibliotekanauki.pl/articles/1399781.pdf

Data publikacji:

2013-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.05.cp
61.46.Hk
68.37.-d

Opis:

Carbon-coated $Li_2FeSiO_4//C$ cathode materials have been synthesized through a modified ball-milling process. The physical characterizations of $Li_2FeSiO_4$ were conducted by using X-ray powder diffraction, field-emission scanning electron microscopy and transmission electron microscopy techniques. Field-emission scanning electron microscopy and transmission electron microscopy images revealed that $Li_2FeSiO_4//C$ consists of nanosized particles coated with an amorphous carbon layer. The electrochemical performances of $Li_2FeSiO_4//C$ cathode materials were evaluated through fully assembled lithium batteries via cyclic voltammetry, charge/discharge test and electrochemical impedance spectroscopy. The $Li_2FeSiO_4//C$ cathode materials showed a much improved electrochemical performance in terms of higher specific capacity, better cycling performance and less charge transfer resistance than that of the pristine $Li_2FeSiO_4$.

Źródło:

Acta Physica Polonica A; 2013, 123, 2; 279-282
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Dependence of Tin Whisker Growth on Copper and Oxygen Content on the Surface of Tin-Rich Lead Free Alloys

Autorzy:

Skwarek, A.
Witek, K.
Pluska, M.
Czerwinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1399972.pdf

Data publikacji:

2013-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.66.Dk
68.70.+w
68.37.Hk

Opis:

The introduction of lead-free technology into electronics has intensified concern over tin whiskers phenomenon. Tin whiskers are crystals growing from the alloy surface as the result of compressive stress relaxation. This paper presents the dependence of tin whisker growth on copper and oxygen surface content. The observations and measurements were done using scanning electron microscopy with energy-dispersive X-ray spectroscopy. The results show that whisker growth is strongly related to increased copper and oxygen surface content in whisker neighborhood.

Źródło:

Acta Physica Polonica A; 2013, 123, 2; 430-431
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Electrical and Heat Currents in Nanoscopic System with Ferromagnetic Electrodes of Non-Collinear Magnetic Moments

Autorzy:

Wierzbicki, M.
Świrkowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/1426962.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.Hk
73.50.Lw
85.80.Fi

Opis:

Thermoelectric properties of nanoscopic system composed of a single-level quantum dot attached to ferromagnetic electrodes are studied with the use of the non-equilibrium Green function formalism. Electrical and heat currents flowing through the system under temperature gradient and bias voltage are calculated in the non-linear regime. Both charge and heat currents strongly depend on configuration of magnetic moments in the leads. TMR ratio is mostly positive, but in a region of small bias voltages, where the electron flow is determined by the temperature gradient, electrical current in parallel and antiparallel configurations flows in opposite directions leading to considerable negative TMR.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1073-1075
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Anomalous Phase Transitions in $LiCsSO_4$ in the Compressible hcp Ising Model

Autorzy:

Lehmann-Szweykowska, A.
Kurzyński, M.
Wojciechowski, R.
Wiesner, M.
Mróz, B.

Powiązania:

https://bibliotekanauki.pl/articles/1427164.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.35.+c
75.10.Hk
62.20.D-

Opis:

Structural low-temperature phase transformations in $LiCsSO_4$ are analysed in a newly tailored simple model of the static soliton in the periodically modulated phases of the one-dimensional compressible Ising model. It is shown that the original hcp symmetry is crucial for understanding of the anomalous temperature-dependence of the Brillouin shift.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1108-1110
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Transport Through a Single-Molecule Transistor: Master-Equation Approach

Autorzy:

Donabidowicz-Kolkowska, A.
Timm, C.

Powiązania:

https://bibliotekanauki.pl/articles/1431179.pdf

Data publikacji:

2012-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.23.Hk
73.63.-b
81.65.+h

Opis:

In the present work we employ the master-equation approach to describe the transport through a molecule located in the central region between two external electrodes. In contrast to the transport through a quantum dot, electron-phonon coupling should be taken into account for tunnelling through a molecule. The coupling results in the appearance of additional effects such as vibrational sidebands or, for the case of strong coupling, a suppression of the current at low bias voltage (Franck-Condon blockade). In contrast to previous studies, the transport properties are described by the density matrix calculated explicitly with diagonal and off-diagonal elements. The observed phenomena are discussed and compared to previous studies.

Źródło:

Acta Physica Polonica A; 2012, 121, 4; 730-732
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:

Microstructure and Surface Morphology of Nanocrystalline Silver Silicates

Autorzy:

Duhan, S.

Powiązania:

https://bibliotekanauki.pl/articles/1489860.pdf

Data publikacji:

2012-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.Df
61.46.Hk
78.67.Bf

Opis:

Microstructure and surface morphology of AgO nanocrystallites (25 nm) supported on $SiO_2$ and subjected to heat treatment in air up to 500C have been studied by transmission electron microscopy, scanning electron microscopy, and the Fourier transform infrared spectroscopy measurements. It has been found that heating at 500C resulted in spreading of AgO over silica and formation of quasi two-dimensional amorphous phase (silicate precursor) exhibiting very weak band at $566 cm^{-1}$ have appeared in the Fourier transform infrared spectroscopy. Nanocrystalline silver silicate of undefined structure formed at 300-500C.

Źródło:

Acta Physica Polonica A; 2012, 121, 3; 636-638
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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