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Wyświetlanie 1-15 z 826
Tytuł:
Morphology and Elemental Composition of Cerate-Zirconate Compound as-Prepared by a Sol-Gel Technique
Autorzy:
Osman, N.
Abdullah, N.
Ibarahim, N.
Hassan, O.
Powiązania:
https://bibliotekanauki.pl/articles/1400572.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Be
82.45.Aa
Opis:
Powder of $BaCe_{0.54}Zr_{0.36}Y_{0.1}O_{2.95}$ (BCZY) ceramics compound was synthesized by a modified sol-gel method using triethylenetetraamine, TETA as a chelating agent. The samples were dried and calcined at 325°C and 1100°C, respectively. The resulting powder properties were characterized using Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Fluorescence Spectroscopy (XRF) and Energy Dispersive X-Ray (EDX). At calcination temperature of 1100°C, the sample shows particles with high purity, spherical shape and a single particle size distribution in the range of 342-396 nm. XRF and EDX analysis revealed that the elemental composition of Ba, Ce, Zr and Y present in the sample is almost the same as the nominal stoichiometric composition of BCZY compound. Thus, TETA is one of the potential chelating agents that can be used to synthesize high purity and homogeneous spherically grained cerate-zirconate powders.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 931-933
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relaxation of $\text{}^{53}$Cr Spin Echo Signals in Cd$\text{}_{0.985}$Ag$\text{}_{0.015}$Cr$\text{}_{2}$Se$\text{}_{4}$
Autorzy:
Abelyashev, G. N.
Berzhansky, V. N.
Polulyakh, S. N.
Sergeev, N. A.
Powiązania:
https://bibliotekanauki.pl/articles/2013365.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.20.+q
76.60.-k
76.60.Lz
Opis:
The frequency dependences of the relaxation times of NMR spin echo signals of quadrupole nuclei $\text{}^{53}$Cr at t$\text{}_{e}$=τ and t$\text{}_{e}$=3τ in ferromagnetic semiconductor Cd$\text{}_{0.985}$Ag$\text{}_{0.015}$Cr$\text{}_{2}$Se$\text{}_{4}$ were investigated at temperature 4.2 K. It was shown that there are two kinds of the quadrupole nuclei $\text{}^{53}$Cr, which have quite different relaxation times. The existence of two kinds of the nuclei $\text{}^{53}$Cr was connected with doping of the cadmium selenochromite with Ag$\text{}^{+}$ ions.zap
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 753-756
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Variational Calculation of Bulk Moduli for Liquid Binary Alloys of Alkali Metals
Autorzy:
Dubinin, N.
Powiązania:
https://bibliotekanauki.pl/articles/1030333.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Ce
61.20.Ne
71.22.+i
62.10.+s
Opis:
The bulk moduli of the Na-K, Na-Cs, and K-Rb liquid equiatomic alloys at T=373 K are calculated by the variational method with the hard-sphere reference system. The local Animalu-Heine model pseudopotential and Toigo-Woodruff exchange-correlation function are used for the calculation. A good agreement with experimental data is achieved.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 237-239
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactivity Properties and Characterization of Commercial Synthetic Hydroxyapatite - 5 wt.% Niobium (V) Oxide - 5 wt.% Magnesium Oxide Composite
Autorzy:
Demirkol, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031119.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.J-
Opis:
Hydroxyapatite is widely used for bone grafts due to its chemical and structural similarities to the mineral phase of hard tissues and due to its bioactivity and biocompatibility. However, hydroxyapatite has poor mechanical properties due to its brittleness. To improve mechanical properties of hydroxyapatite-ceramics, ceramic oxides, whiskers or fibers have been suggested. In this study, commercial synthetic hydroxyapatite composite reinforced with 5 wt.% Nb₂O₅ and 5 wt.% MgO was characterized. Microstructural properties of all samples sintered at different temperatures were characterized using scanning electron microscopy technique. Phase analysis was carried out using X-ray diffraction technique. Mechanical properties were measured by compression and hardness tests. The bioactivity property was determined by in vitro bioactivity test. The best obtained values of density, compression strength and Vickers Microhardness were 3.01 g/cm³, 96 MPa and 393 HV, for composite sintered at 1300°C for 4 hours. Bioactivity results for composite, sintered at 1300°C, show that apatite formation has started after two weeks in a simulated body fluid. At the end of the fourth week, the dense apatite layer and clusters were observed on the surface of the composite.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 786-788
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of Construction Project Taking into Account Technological and Organizational Risk
Autorzy:
Ibadov, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031682.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.MH
Opis:
During the implementation of construction projects, there is permanently a certain level of technological and organizational risk. This is due to the fact that the data on conditions for a construction project tend to have different levels of uncertainty. Even the projects of the same size and terms of implementation vary. The failure risk of individual works results from technological and organizational factors, such as, for example, the difficulty of technological execution of individual works; availability of construction materials; the difficulty of the organization of individual works; availability of qualified personnel, availability of necessary machinery and equipment in the technology, etc. These factors affect the time and the cost of construction projects. When taking into account their influence, while selecting an option for construction project, it is crucial to maintain the contractual cost and time. An example of the option selection for construction project implementation is presented in this article, including technological and organizational risk, using the fuzzy sets theory and linguistic variables.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 974-977
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the risk factors impact on the construction projects implementation using fuzzy sets theory
Autorzy:
Ibadov, N.
Powiązania:
https://bibliotekanauki.pl/articles/1065335.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Mh
87.52.Px
Opis:
The complexity of construction projects increases the likelihood of hazards affecting their successful implementation. There are many risk factors that lead to the failure of the project. These factors should be identified and ordered both because of their degree of importance (significance) and level (volume) of a given factors. This is very important in order to determine their effect on the construction project. Typically, the threats for the construction project include the extension of the project duration, the increase of the project cost and/or the reduce of the quality of the works. This article aims (1) to identify risk factors that may affect the construction project in Poland in the above-mentioned aspects and (2) to prioritize the significance of those risk factors. Due to the uniqueness of individual construction projects, the potential hazards and their effects are usually characterized by different levels of uncertainty. Unfortunately, it is often a non-statistical uncertainty. For this reason, the degree of significance of risk factors is described and modelled using linguistic variables and elements of the theory of fuzzy sets. This method allows to evaluate the risk of construction projects prior to their implementation.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 107-111
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The SW-MSA calculation of self-diffusion coefficients in liquid lithium and rubidium
Autorzy:
Dubinin, N.
Powiązania:
https://bibliotekanauki.pl/articles/1075357.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.20.Gy
61.20.Ne
61.25.Mv
66.10.C-
Opis:
Successfully used recently for liquid Na and K the approach combined the linear trajectory approximation with the square-well model in the semi-analytical representation of the mean spherical approximation to calculate the self-diffusion coefficients is applied here to liquid Li and Rb. As well as earlier for Na and K, the results obtained are found to be in reasonable agreement with the available experimental data and confirm previous conclusion that the square-well model within the mean spherical approximation is quite useful for description of diffusion properties in liquid alkali metals.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 310-312
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiative Donor-Acceptor Pair Recombination in $Tl_2Ga_2Se_3S$ Layered Single Crystals
Autorzy:
Gasanly, N.
Powiązania:
https://bibliotekanauki.pl/articles/1400493.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
78.20.-e
71.55.-i
Opis:
The emission band spectra of $Tl_2Ga_2Se_3S$ layered crystals have been studied in the temperature range of 10-50 K and in the wavelength region of 540-700 nm. A broad photoluminescence band centered at 626 nm (1.98 eV) was observed at T=10 K. Variation of emission band has been studied as a function of excitation laser intensity in the 0.4-51.5 mW $cm^{-2}$ range. The analysis of the spectra reveals that the peak energy position changes with laser excitation intensity (blue shift). This behavior of the emission band is in agreement with the idea of separation inhomogeneity of donor-acceptor pairs. Radiative transitions from the moderately deep donor level $E_{d}$=270 meV to the shallow acceptor level $E_{a}$=10 meV were suggested to be responsible for the observed photoluminescence band.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 128-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex THz Reflectance Spectra of Hexogen Measured for Various Surfaces
Autorzy:
Palka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418028.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
78.20.Ci
78.40.Pg
78.40.-q
78.47.jg
Opis:
In this paper, we report on measurements of reflection spectra of hexogen (RDX) by means of time domain spectroscopy. We analyzed both phase and amplitude of reflected impulses for three cases: detuning, samples with rough surfaces and samples with curved surfaces. It can be concluded that both spectral characteristics can be applied for identification of explosives in the reflection configuration.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 854-857
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy of Explosive Materials in the THz Range
Autorzy:
Palka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1506821.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.57.Ty
07.57.Pt
78.20.Ci
78.40.Pg
Opis:
Absorption spectra of hexogen and penthrite-2 commonly used explosive materials in the range 0.3-3 THz are presented. The measurements were carried out by means of time domain spectroscopy and compared to spectra obtained by Fourier transform infrared spectroscopy. Good conformity is observed.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1229-1231
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence of Lanthanides from Xerogels Embedded in Mesoporous Matrices
Autorzy:
Gaponenko, N.
Powiązania:
https://bibliotekanauki.pl/articles/1814047.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
83.80.Jx
81.05.Rm
78.55.Mb
61.43.Gt
82.45.Cc
42.70.Qs
78.55.Ap
78.60.-b
Opis:
The report summarizes peculiarities of synthesis and luminescence properties of porous silicon, porous anodic alumina and artificial opals with the inclusions of sol-gel derived oxides (xerogels), doped with Er, Tb, and Eu. Origin of strong luminescence of lanthanides from xerogels in mesoporous matrices is discussed.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 737-749
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimum Uncertainty States Using n-Dependent Annihilation Operator
Autorzy:
Ullah, N.
Powiązania:
https://bibliotekanauki.pl/articles/1932110.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ca
Opis:
We develop a formalism to obtain minimum uncertainty states using n-dependent annihilation operator. The formalism is applied to a three-dimensional harmonic oscillator and also to the one containing centrifugal barrier term. Our formalism shows that in both the cases the minimum uncertainty state can be written down as a product of the ground state and a simple function.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 571-574
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interatomic Pair Interaction in Liquid Transition Metals
Autorzy:
Dubinin, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808052.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Mv
71.15.Dx
71.20.Be
Opis:
The Wills-Harrison pair interaction is investigated for liquid Fe on the base of the introduced relation between parameters of the model pseudopotential and d-electron characteristics. It is shown that the procedure suggested leads to the significant shift of the first minimum of the pair potential and increases the softness of its repulsive part.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 783-785
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Structural Parameters by EXAFS Analysis of Some Co Complexes
Autorzy:
Mishra, A.
Parsai, N.
Dagaonkar, N.
Powiązania:
https://bibliotekanauki.pl/articles/1538706.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cj
Opis:
In this paper we deal with a relatively simpler method for the Fourier analysis of EXAFS data and illustrate this by a detailed analysis of the data for cobalt metal foil and cobalt complexes of isoxezol series. The Fourier analysis is useful in extracting distances and information about the phase shifts, the amplitudes, the Debye-Waller factors and the mean free paths. Here we have determined interatomic distances, mean square deviation and inelastic mean free path from the Fourier transform of EXAFS data for cobalt metal foil and cobalt complexes of isoxezol series by Math-CAD programming.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 490-492
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Internally Oxidized Copper
Autorzy:
Misheva, M.
Nancheva, N.
Feschiev, N.
Powiązania:
https://bibliotekanauki.pl/articles/1929106.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The positron lifetimes in internally oxidized polycrystalline copper, annealed at different temperatures, were measured. It was found that the dispersed alumina particles act as positron traps. Estimation of concentration of defects was made in the frames of the trapping model.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 365-369
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 826

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