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Wyświetlanie 1-15 z 2103
Tytuł:
Annealed Alloy of Ising Magnets Within Two-Site Cluster Approximation
Autorzy:
Levitskii, R. R.
Sorokov, S. I.
Sokolovskii, R. O.
Powiązania:
https://bibliotekanauki.pl/articles/1964694.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.Cn
Opis:
Ising mixture with equilibrium disorder is considered. The nearest neighbour spin coupling and direct interatomic interaction are taken into account within two-site cluster approximation. Thermodynamic potential and q-dependent pair correlation function are obtained. Interplay between interspin and interatomic interactions, their influence on magnetic phase transition and alloy segregation are studied. Cluster fluctuations cause significant changes with respect to mean field theory: phase diagram complicates and magnetic properties deviate from those of quenched system.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal-Semiconductor Transition on the Surface and in the Bulk of Europium Hydride Thin Film
Autorzy:
Knor, M.
Nowakowski, R.
Duś, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418265.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.63.Gh
73.61.-r
78.66.-w
73.20.-r
Opis:
Thin europium films (20-50 nm thick) on a glass substrate were transformed into $EuH_x$ (0 < x < 2) by interaction with H_2 introduced into the reactor in successive calibrated doses. By measuring the pressure, the hydrogen uptake (H/Eu) was determined at every step of the reaction. In situ monitoring of bulk properties (electrical resistance R(H/Eu), relative transparency to light T(H/Eu)/$T_0$ and (H/Eu) dependent light transparency spectrum) confirms metal-semiconductor transition at room temperature. Both the electrical resistance and optical transparency of the film strongly increase with hydrogen concentration as a consequence of the resulting increase of the content of semiconducting dihydride. Moreover, the course of work function changes ΔΦ(H/Eu) indicates inversion of the charge-transfer direction on the surface. The transition at room temperature from positively to negatively polarized hydrogen adsorbate was observed in situ during hydrogen uptake. As a result, the work function at equilibrium state varies with hydrogen content from +18 to -18 mV with respect to pure metal film, reflecting the change of "mirror potential" generated on the surface due to the accumulation of hydrogen adsorbates in the subsurface region.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 698-703
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Predictive Maintenance System in Drinking Water Pumping Stations
Autorzy:
Kiliç, R.
Kozan, R.
Karayel, D.
Özkan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1031568.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
62.25.Jk
Opis:
Pumping stations are some of the most important facilities of water administration. Continuous operation of these facilities is of utter importance, to be able to serve at all times. Maintenance of these facilities is also crucial for uninterrupted operation. In this study, the functioning of the predictive maintenance technique, which is based on the vibration analysis, is briefly addressed, and the application of the technique in a real system is presented. In the real system, the steps that must be done in order to apply this system are shown step-by-step. At the end of the study, the failures determined by using the predictive maintenance method are analyzed, and solution suggestions are presented.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1016-1021
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Medical Substances of Insulin
Autorzy:
Pietrzak, R.
Szatanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043341.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Positrons lifetimes were measured in medical substances of insulin (human and animal), differing as far as the degree of purity and time of their activity in the organism are concerned. In all of the cases the spectrum of positron lifetime was distributed into three components, with the long-life component ranging from 1.8 to 2.08 ns and the intensity taking on values from 18 to 24%. Making use of Tao-Eldrup model, the average radius of the free volume, in which o-Ps annihilated, and the degree of filling in the volume were determined. It was found that the value of the long-life component for human insulin is higher than that of animal insulin. Moreover, the value of this component clearly depends on the manner of purification of the insulin. It was also noticed that there occurs a correlation between the value of this component and the time after which it begins to be active in the organism, as well as the total time of its activity.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 852-856
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaAlAs Allox/Pseudoalloy Type II Structures
Autorzy:
Jeżewski, M.
Teissier, R.
Planel, R.
Powiązania:
https://bibliotekanauki.pl/articles/1879871.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.65.Fa
Opis:
The existence of type-II structures made from the combination of Ga$\text{}_{1-x}$AI$\text{}_{x}$As alloy and a short period GaAs/AlAs type-I superlattice is presented. Such three material structures are of type-II having at the same time electrons and holes of Γ-symmetry. This contrasts with the usual situation in type-II two material GaAs/AlAs structure where the ground state of electrons is of X-symmetry. The mechanism allowing creation of three material type-II structures is based on the difference of effective masses of electrons and holes. It should be valid for all similar semiconductor systems. Experimental results of photoluminescence and photoluminescence excitation studies of such structures made by Molecular Beam Epitaxy are presented. We determine the mutual positions of the electron and hole ground levels in the alloy and pseudoalloy and confirm that the studied structure is of type-II.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 195-198
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chirality Induced by Magnetoelectrolysis
Autorzy:
Mogi, I.
Aogaki, R.
Morimoto, R.
Watanabe, K.
Powiązania:
https://bibliotekanauki.pl/articles/1202308.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.35.Tv
Opis:
Surface chiral formation of Cu films was investigated in the galvanostatic electrodeposition under a magnetic field of 5 T perpendicular to the electrode surface. The surface chirality was examined by electrochemical voltammograms of a chiral molecule of tartaric acid. The chiral induction depended on the magnetoelectrodeposition time, and this implied that the formation of the self-organized state of magnetohydrodynamic flows around the electrode is crucial for the chiral formation.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 380-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Investigation of Glycine Phosphite Crystal
Autorzy:
Czukwinski, R.
Czapla, Z.
Styrkowiec, R.
Powiązania:
https://bibliotekanauki.pl/articles/2029273.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The complementary measurements of the dielectric dispersion in ferroelectric phase of glycine phosphite crystal at the frequency range of 200 Hz - 1 MHz have been carried out. The analysis of the dielectric spectra of the low frequency relaxation process showed that it can be fitted by two Debye-type relaxators. The activation energy of the both processes has been calculated. The observed behaviour of the relaxators suggests that they are connected with a domain structure; one with the growth of the nuclei whereas the second with the domain wall movement.
Źródło:
Acta Physica Polonica A; 2001, 100, 6; 897-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Iron-Containing Clusters in Silica of Predetermined Porosity
Autorzy:
Šimkiene, I.
Baran, M.
Babonas, G.-J.
Bendorius, R.-A.
Rėza, A.
Szymczak, R.
Aleshkevych, P.
Šustavičiūtė, R.
Tamaševičius, R.
Powiązania:
https://bibliotekanauki.pl/articles/2041804.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.+w
75.75.+a
78.66.-w
Opis:
Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe$\text{}_{2}$O$\text{}_{3}$ and Fe$\text{}_{3}$O$\text{}_{4}$ were formed in the samples and that their relative amount was dependent on preparation technology.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 400-407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Positrons Lifetimes in Corroded Nickel
Autorzy:
Pietrzak, R.
Szatanik, R.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2008182.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
An attempt was undertaken at making use of a technique of taking measurements of lifetimes of positrons emitted from $\text{}^{22}$Na source to investigate corroded nickel. It was found that after corrosion in HCl vapours mean positrons lifetime, the second component of positrons lifetimes as well as its intensity rise along with the corrosion time.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 647-651
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paramagnetic Centres in Oxidised Coal
Autorzy:
Najder-Kozdrowska, L.
Samoilova, R.
Kappl, R.
Hüttermann, J.
Więckowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1536451.pdf
Data publikacji:
2010-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.35.+r
61.66.Hq
76.30.Rn
89.30.ag
Opis:
This paper comprises the results obtained by continuous wave (cw)/pulse electron paramagnetic resonance spectroscopy for oxidised coals. The values of EPR linewidths are different for samples of coal treated by different chemical agents. The asymmetric EPR line shape indicates to complex composition of paramagnetic centres in coal. In coal oxidised by $HNO_3$ big changes of linewidth with temperature were observed. For all samples the spin-lattice relaxation time $T_1$ was determined by pulse EPR method. The correlation between used chemical agents and the value of $T_1$ was established.
Źródło:
Acta Physica Polonica A; 2010, 118, 3; 475-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemisorption Theory at Submonolayer Coverages: Influence of the Dynamic Hopping on the Electronic Characteristics
Autorzy:
Cardenas, R.
Taranko, E.
Taranko, R.
Fedyanin, V.
Powiązania:
https://bibliotekanauki.pl/articles/1891892.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
82.65.My
Opis:
The influence of the dynamic hopping term included in the Newns-Anderson Hamiltonian on the electronic structure of the chemisorbed layer at different coverages rates is investigated. It is shown that this additional interaction can destroy the initial symmetry of the Newns-Anderson model or restore this symmetry in the initial negative asymmetric case. The coverage dependence of the adatom electron charge is also studied for the case of hydrogen chemisorption on a model transition metal surface.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 731-743
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Type of Semi-Insulating Materials
Autorzy:
Leon, R. P.
Weber, E. R.
Powiązania:
https://bibliotekanauki.pl/articles/1921578.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
Opis:
The introduction of Cu in InP at 700°C and higher temperatures results in both initially p-type and n-type InP become semi-insulating. It is also observed that thermally stable In-Cu rich precipitates form, that the concentration of deep levels is negligible and that InP:Cu samples exhibit inhomogeneities and anomalous transport behavior. The buried Schottky barrier model is the only model thus far studied which is consistent with these experimental observations. This model has general applicability, and its possible relevance to other semiconductors is examined. The conditions necessary for forming quasi-intrinsic semiconductors by metallic precipitation are discussed.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 664-669
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Third-Order Susceptibility of Silicon Crystals Measured with Millimeter-Wave Gyrotron
Autorzy:
Narkowicz, R.
Siegrist, M.
Moreau, Ph.
Hogge, J.
Raguotis, R.
Brazis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1505226.pdf
Data publikacji:
2011-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ky
72.20.Ht
Opis:
We investigate experimental dependence of the third harmonic generation efficiency in the n-type Si crystals on the geometrical dimensions of the sample, polarization and power of the fundamental wave. The efficiency increases monotonically with the rise of the sample thickness up to a threshold value, and decreases dramatically above the threshold. At shorter propagation distances the generation efficiency could be correctly simulated using the layered medium approximation and the numerically calculated electron drift velocity response to the pumping wave electric field to describe the change of the semiconductor properties under high-power microwave irradiation.
Źródło:
Acta Physica Polonica A; 2011, 119, 4; 509-513
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon Etching in $XeF_2$ Environment
Autorzy:
Knizikevičius, R.
Powiązania:
https://bibliotekanauki.pl/articles/1400495.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Cf
82.35.Gh
82.65.+r
Opis:
Enhancement of silicon etching rate in $XeF_2$ environment is considered by a proposed model, which includes processes of adsorption, activation, chemical reactions, relaxation, desorption, and sputtering. The enhancement of silicon etching rate is explained by considering hydrocarbon molecules from background gas contamination in the vacuum chamber, and assuming that hydrocarbon radicals enhance the etching rate. The composition of the adsorbed layer during silicon etching in $XeF_2$ environment is calculated. It is found that hydrocarbon radicals intensify reaction of $XeF_2$ molecules with Si atoms on the surface and that this changes the kinetics of the etching rate. Using the obtained theoretical results the difference in kinetics of the etching rates of first and subsequent run is explained.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 137-140
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-Temporal Dynamics of Chain of Coupled Impact Pendulums
Autorzy:
Stępień, R.
Kosiński, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/1964195.pdf
Data publikacji:
1997-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
Opis:
A chain of N, one-dimensional, impact pendulums is investigated using numerical solutions of equations of motion. Ranges of periodic, mixed and chaotic motion are found using spatio-temporal diagrams. A correlation function and power spectrum density functions are calculated for these digitized diagrams. Influence of the coupling strength k and the number of pendulums N on the dynamics of the system is discussed.
Źródło:
Acta Physica Polonica A; 1997, 91, 6; 1053-1059
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2103

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