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Wyświetlanie 1-15 z 44
Tytuł:
Amelioration of Ultrasonic Transducer to Study CuO Doped Thin Films
Autorzy:
Barakat, M. A. Y.
Powiązania:
https://bibliotekanauki.pl/articles/176534.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic
thin films
doping
microstructure
wedge
Opis:
Ultrasonic pulse echo technique was used to study cupric oxide (CuO) thin films. CuO thin films were prepared using sol gel technique. They were doped with Lithium (Li) (1%, 2% and 4%). Thin films’ thickness (d) and band gap energy (Eg) were measured. In addition, elastic moduli (longitudinal (L), shear (G), bulk (K) and Young’s (E)) and Poisson’s ratio (v) were determined to estimate the microstructure properties of the prepared films. The study ameliorated the used transducers to overcome their dead zone and beam scattering; wedges were developed. The results showed the effectiveness of these wedges. They enhanced transducers’ sensitivity by changing the dead zone, beam diameter, beam directivity and waves’ transmission. Also, the study noted that Li doping caused the improvement of CuO thin films to be more useful in solar cell fabrication. Li-CuO thin films had narrower band gap. Thus, they acquired a high quantum yield for the excited carriers; also they gained more efficiency to absorb solar light.
Źródło:
Archives of Acoustics; 2018, 43, 3; 487-495
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anharmonicity and Weak Mode Assignment in La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$, with Oxygen Isotopic Substitution
Autorzy:
Siranidi, E.
Lampakis, D.
Palles, D.
Liarokapis, E.
Conder, K.
Powiązania:
https://bibliotekanauki.pl/articles/2047249.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
31.30.Gs
74.25.Kc
74.72.Dn
Opis:
The oxygen isotope effect on the first- and second-order Raman active modes of high-quality La$\text{}_{2-x}$Sr$\text{}_{x}$Cu$\text{}^{16,18}$O$\text{}_{4}$ (80% substitution $\text{}^{16}$O by $\text{}^{18}$O) polycrystalline compounds with x=0.00, 0.015 was investigated at low temperatures. In the second-order Raman scattering several weak and strong peaks were observed and assigned to oxygen atom vibrations. With the isotopic substitution the apex oxygen mode follows quite well the mass harmonic law at all temperatures studied, while the soft mode is anharmonic in the temperature range of 77-180 K and for higher temperatures its anharmonicity is strongly increased. The temperature dependence of the energy of the soft mode for x=0.0 shows also a modification at≈180 K and an abnormal behaviour at≈280 K, which may be related with the transition to the antiferromagnetic phase.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 173-177
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlled Synthesis and Application of Nano-energetic Materials Based on the Copper Oxide/Al System
Autorzy:
He, S.
Chen, J.
Yang, G.
Qiao, Z.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358254.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nanoenergetic material
CuO/Al
laser ignition
plate-like
hollow sphere
Opis:
Nanothermite composites containing metal oxide and metal fuel are attracting attention due to their outstanding combustion characteristics. The morphology of metal oxide is important for the performance of nanothermite composites. In this paper, branch-, plate-, sphere-, and hollow sphere-like CuO nano/microstructures were synthesized via a facile hydrothermal process. The CuO/Al based nanothermites were prepared via ultrasonic mixing of the asobtained CuO products and nano-Al. The combustion behaviour of CuO/Al based nanothermites was analyzed by DSC and laser ignition. This study shows that this nanoscale mixing resulted in a large interfacial contact area and low diffusional resistance between the fuel and the oxidizer, and the reaction reflects large energy and laser ignition sensitivity.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 1; 129-144
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd$\text{}_{2}$CuO$\text{}_{4}$ Phase. Part II
Autorzy:
Horyń, R.
Bukowska, E.
Sikora, A.
Wołcyrz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2041471.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.75.+g
81.40.Rs
75.50.-y
72.20.My
Opis:
Two samples of nominal composition Gd$\text{}_{1.80}$Ce$\text{}_{0.15}$CuO$\text{}_{4.0}$ and Gd$\text{}_{1.85}$Ce$\text{}_{0.15}$CuO$\text{}_{4.075}$ were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase. Oxygen content reduction and further tests on the samples obtained are in progress.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 733-738
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling
Autorzy:
Oh, Minseok
Kim, Kwanil
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/355529.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-CuO
thermite
nanocomposite
cryomilling
high energy density materials
Opis:
Al-CuO is a thermite material exhibiting the exothermic reaction only when aluminum melts. For wide spread of its applica-tion, the reaction temperature needs to be reduced in addition to the enhancement of total reaction energy. In the present study, a thermite nanocomposite with a large contact area between Al and CuO was fabricated in order to lower the exothermic reaction temperature and to improve the reactivity. A cryomilling process was performed to achieve the nanostructure, and the effect of composition on the microstructure and its reactivity was studied in detail. The microstructure was characterized using SEM and XRD, and the thermal property was analyzed using DSC. The results show that as the molar ratio between Al and CuO varies, the fraction of uniform nanocomposite structure was changed affecting the exothermic reaction characteristics.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 931-934
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CuO–water mhd mixed convection analysis and entropy generation minimization in double-lid–driven u-shaped enclosure with discrete heating
Autorzy:
Mliki, Bouchmel
Miri, Rached
Djebali, Ridha
Abbassi, Mohamed A.
Powiązania:
https://bibliotekanauki.pl/articles/2204647.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
U-shaped enclosure
MHD mixed convection
nanoliquids
double lid-driven cavity
entropy generation
LBM
Opis:
The present study explores magnetic nanoliquid mixed convection in a double lid–driven U-shaped enclosure with discrete heat-ing using the lattice Boltzmann method (LBM) numerical method. The nanoliquid thermal conductivity and viscosity are calculated using the Maxwell and Brinkman models respectively. Nanoliquid magnetohydrodynamics (MHD) and mixed convection are analyzed and entropy generation minimisation has been studied. The presented results for isotherms, stream isolines and entropy generation describe the interaction between the various physical phenomena inherent to the problem including the buoyancy, magnetic and shear forces. The operating parameters’ ranges are: Reynolds number (Re: 1–100), Hartman number (Ha: 0–80), magnetic field inclination (γ: 0°–90°), nanoparticles volume fraction (ϕ: 0–0.04) and inclination angle (α: 0°–90°). It was found that the and the total entropy generation augment by increasing Re, ϕ: and γ. conversely, an opposite effect was obtained by increasing Ha and α. The optimum magnetic field and cavity inclination angles to maximum heat transfer are γ = 90° and α = 0.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 112--123
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the active phase structure in CuO/γ-Al$\text{}_{2}$O$\text{}_{3}$catalysts by TPR kinetic model discrimination
Autorzy:
Kuśtrowski, P.
Białas, A.
Surman, J.
Dudek, B.
Powiązania:
https://bibliotekanauki.pl/articles/2080034.pdf
Data publikacji:
2010-01-01
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
The results of temperature-programmed reduction with hydrogen of alumina supported copper oxide catalysts were used to find the best model describing the kinetics of Cu ions' reduction. On the basis of the rate determining step of this reaction the structure of copper oxide was revealed. This kinetic approach was compared with BET and UV-vis-DRS results. The catalytic activity of various copper oxide forms was tested in toluene combustion.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2010, 65; 68-78
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drag reduction in the flow of CuO based nanofluid
Redukcja oporów przepływu w nanopłynie zawierającym cząstki CuO
Autorzy:
Gierczycki, A.
Drzazga, M.
Lemanowicz, M.
Dzido, G.
Powiązania:
https://bibliotekanauki.pl/articles/2072813.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
nanofluid
surfactant
CTAC (cetyltrimethylammonium chloride)
NaSal (sodium salycilate)
drag reduction
nanopłyn
surfaktant
CTAC (chlorek cetylotrimetyloamoniowy)
NaSal (salicylan sodu)
obniżenie oporów przepływu
Opis:
Experimental studies on drag reduction (DR) of CuO based nanofluid with the additives of mixture of cationic surfactant CTAC (cetyltrimethylammonium chloride) and sodium salycilate - NaSal were performed. The obtained results were compared with those for water solution of CTAC/NaSal. Values of pressure drop were measured in specially designed laboratory setup equipped with measuring tubes of three different diameters - 4, 8 and 12 mm. It was found that the addition of surfactant and sodium salycilate mixture to nanofluid decreased its pressure drop during flow, however the drag reducing effect was greater for pure water. The DR effect obtained was in the range of 20 ÷ 70% for CuO based nanofluid. The diameter effect was also observed - the DR coefficient was greater for pipes of smaller inner diameters.
Przeprowadzono badania eksperymentalne dotyczące obniżenia oporów przepływu (DR) w nanopłynie z cząstkami CuO oraz dodatkiem mieszaniny kationowego surfaktantu CTAC (chlorek cetylotrimetyloamoniowy) i salicylanu sodu - NaSal. Otrzymane wyniki porównano z otrzymanymi dla wodnego roztworu CTAC/NaSal. Wartości oporów przepływu mierzono w specjalnie w tym celu zaprojektowanej instalacji laboratoryjnej wyposażonej w rurki pomiarowe o trzech różnych średnicach - 4, 8 i 12 mm. Stwierdzono, że dodatek mieszaniny surfaktantu i salicylanu sodu do nanopłynu zmniejsza jego opory przepływu w rurze, lecz w mniejszym stopniu niż dla czystej wody. Uzyskano współczynnik DR dla nanopłynu zawierającego cząstki CuO w zakresie 20 ÷70%. Zaobserwowano także wpływ średnicy rurki - współczynnik DR był większy dla rurek o mniejszej średnicy.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 1; 8--9
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cd Doping on Structural and Some Optical Studies of Nano CuO Films Prepared by Sol–Gel Technique
Autorzy:
Kadhim, Raheem G.
Ban, Raheem Saleh Kzar
Powiązania:
https://bibliotekanauki.pl/articles/1182823.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cd
CuO
Sol–Gel Spin Coating Technique
Thin Film
Opis:
This research deals with the study of the structural and optical properties of CuO and Cd doped CuO nano films in thickness 100nm were deposited on a glass substrate using sol-gel spin coating technique. XRD results indicated that the films are polycrystalline and have monoclinic structure with a preferred orientation along ((111).) ̅ and the grain size increase with increasing concentration Cd. Data of AFM indicate that the surface of films is smooth. From SEM image observed the particles are smallest an even particle distribution on a smooth surface. The optical transition in the CuO and (Cd– doped CuO) thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of (Cd) for all samples.
Źródło:
World Scientific News; 2017, 64; 69-83
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Post Growth Annealing on the Structural and Electrical Properties of ZnO/CuO Composite Nanostructures
Autorzy:
Hussain, Mushtaque
Khan, Azam
Nur, Omer
Willander, Magnus
Powiązania:
https://bibliotekanauki.pl/articles/1205261.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
81.40.-z
Opis:
In the present work, ZnO/CuO composite nanostructures have been grown on fluorine doped tin oxide coated glass substrate by aqueous chemical growth method. To observe the effect of post growth annealing (500°C, 1 min) on the structural properties of ZnO nanorods scanning electron microscope and X-ray diffraction techniques have been utilized. SEM images of post growth annealed (post growth annealed) sample reveal that the average diameter of ZnO NRs has considerably increased in comparison with as grown sample. Moreover after post growth annealing the ZnO NRs showed more clearly hexagonal wurtzite structure. Beside this the NRs are also uniform and well aligned with a high aspect ratio of $~10$. In XRD pattern the strongly intense (002) peak of the post growth annealing sample suggest that the crystal quality of the NRs have also been improved significantly. Since the structural improvement have a significant impact on charge transport properties as well, therefore the effect of post growth annealed has also been investigated by the electrical characterization of ZnO/CuO based heterojunction. The current-voltage measurements of the post growth annealed sample showed improvement in the current in comparison with as grown sample. The impedance study has also confirmed that the post growth annealed has influence on the electrical properties. The presented post growth annealed heterojunction of ZnO/CuO may have space in applications like sensors and oxide based diodes in the devices fabrication.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 849-854
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Specific Fuel Consumption and Exhaust Emissions of Four Stroke Diesel Engine with CuO/Water Nanofluid as Coolant
Autorzy:
Senthilraja, S.
Vijayakumar, K. C. K.
Gangadevi, R.
Powiązania:
https://bibliotekanauki.pl/articles/140023.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanofluid
engine performance
exhaust emissions
nanopłyn
wydajność silnika
emisja spalin
Opis:
This article reports the effects of CuO/water based coolant on specific fuel consumption and exhaust emissions of four stroke single cylinder diesel engine. The CuO nanoparticles of 27 nm were used to prepare the nanofluid-based engine coolant. Three different volume concentrations (i.e 0.05%, 0.1%, and 0.2%) of CuO/water nanofluids were prepared by using two-step method. The purpose of this study is to investigate the exhaust emissions (NOx), exhaust gas temperature and specific fuel consumption under different load conditions with CuO/water nanofluid. After a series of experiments, it was observed that the CuO/water nanofluids, even at low volume concentrations, have a significant influence on exhaust emissions. The experimental results revealed that, at full load condition, the specific fuel consumption was reduced by 8.6%, 15.1% and 21.1% for the addition of 0.05%, 0.1% and 0.2% CuO nanoparticles with water, respectively. Also, the emission tests were concluded that 881 ppm, 853 ppm and 833 ppm of NOx emissions were observed at high load with 0.05%, 0.1% and 0.2% volume concentrations of CuO/water nanofluids, respectively.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 1; 111-121
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of ZnO, CuO, Au, and TiO2 nanoparticles on Daphnia magna and early life stages of zebrafish danio rerio
Autorzy:
Liu, J.
Fan, D.
Wang, L.
Shi, L.
Ding, J.
Chen, Y.
Shen, S.
Powiązania:
https://bibliotekanauki.pl/articles/207169.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metal oxides
titanium dioxide
nanoparticles
toxicity
zinc oxide
Daphnia magna
nanocząsteczki
tlenki metali
dwutlenek tytanu
toksyczność
tlenek cynku
rozwielitki
Opis:
The effects of four different kinds of nanoparticles (NPs), namely, CuO, ZnO, TiO2, and Au, of the sizes ranging from <20 nm to 50 nm on Daphnia magna, early life stage of zebrafish, and various enzymes have been investigated. The experimental results showed that the NPs inhibited both the body length and hatching rate of zebrafish larvae; the small nanoparticles exhibited more toxicity. In a 21 day chronic toxicity test, metal ions of higher concentrations significantly reduced the number of Daphnia magna offspring. Studies on enzyme activity showed that the NPs reduced the glutathione content and inhibited catalase and superoxide dismutase activities, resulting in shorter body length, lower hatching success, and lower reproduction of zebrafish larvae. Therefore, studies should focus more on the potential toxicity of smaller NPs.
Źródło:
Environment Protection Engineering; 2014, 40, 1; 139-149
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrophoretic deposition and characterization of CuO/GtO/HA/SA coatings on titanium alloy
Autorzy:
Warcaba, Maciej
Moskalewicz, Tomasz
Hadzhieva, Zoya
Boccaccini, Aldo R.
Powiązania:
https://bibliotekanauki.pl/articles/1844804.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Źródło:
Engineering of Biomaterials; 2021, 24, 163; 53
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epitaxially Induced Defects in Sr- and O-doped La$\text{}_{2}$CuO$\text{}_{4}$ Thin Films Grown by MBE: Implications for Transport Properties
Autorzy:
Locquet, J.-P
Williams, E. J.
Powiązania:
https://bibliotekanauki.pl/articles/1964235.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Nn
74.62.Fj
81.15.Hi
74.72.Dn
Opis:
In this paper, the critical role played by various types of defects and strain relaxation mechanisms in high-T$\text{}_{c}$ thin films is highlighted and illustrated with examples. The defects are essential for providing adequate diffusion channels for oxygen ingress during the cooling step in c-axis thin films. The operation of strain relaxation mechanisms necessitated by the lattice mismatch between film and substrate can impose a compressive or tensile biaxial pressure, which either increases or reduces the critical temperature.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 69-84
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Study of Water Induced Decomposition of the SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ Ceramics Surface. The Role of Carbon Dioxide
Autorzy:
Augustyniak-Jabłokow, M. A.
Yablokov, Yu. V.
Jacyna-Onyszkiewicz, I.
Ivanova, T. A.
Shustov, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/2047737.pdf
Data publikacji:
2007-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
76.30.Fc
81.05.Je
Opis:
Processes of SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ ceramics decomposition induced by contact with water and carbon dioxide were studied by EPR. The dominant signals in the spectra were found to originate from Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ (for Sr$\text{}_{2}$CuO$\text{}_{3}$) and SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O (for SrCuO$\text{}_{2}$) compounds. The thermally induced conversion of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O into Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ was analysed, and its product CuO was found to exist in the nanocrystalline form. The presence of CO$\text{}_{2}$, reacting with Sr(OH)$\text{}_{2}$, was shown to modify the decomposition process leading to the appearance of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O, some hydroxycarbonates and Cu(OH)$\text{}_{2}$ on the surface of ceramics studied. At temperatures higher than 300ºC CuO reacts back with Sr(OH)$\text{}_{2}$. For the samples being in contact with atmospheric moisture this compound, deposited on a surface of SrCuO$\text{}_{2}$, decomposes to Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$. The presence of the antiferromagnetic compounds Cu(OH)$\text{}_{2}$, CuO, and Cu$\text{}_{2}$[(OH)$\text{}_{2}$CO$\text{}_{3}$] in the samples can influence the results of magnetic measurements of the studied ceramics.
Źródło:
Acta Physica Polonica A; 2007, 112, 3; 525-536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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