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Wyświetlanie 1-15 z 243
Tytuł:
Wytwarzanie bazy emulsji kosmetycznych w mieszalnikach mechanicznych typu SEM
Production of cosmetic emulsion base in SEM-type mechanical mixers
Autorzy:
Mitkowski, P. T.
Szaferski, W.
Piotrowska, J.
Mielhorska, A.
Jezierska, M.
Perz, A.
Kuświk, S.
Powiązania:
https://bibliotekanauki.pl/articles/2073313.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
SEM
wytwarzanie emulsji kosmetycznych
SEM-type mixer
preparation of cosmetic emulsions
Opis:
W pracy poddano analizie wpływ liczby sit, przez które wytwarzana była baza emulsji kosmetycznej, na wielkość kropel. Przeanalizowano również układ z pojedynczym sitem, o dwóch różnych wielkościach oczek, pod kątem związku między masowym natężeniem pompy perystaltycznej, a wielkością średnic kropel fazy rozproszonej. Zastosowanie mieszalników typu SEM wpływa korzystnie na właściwości emulsji i pozwoliło uzyskać drobne krople oraz monodyspersyjną emulsję, co jest zjawiskiem pożądanym w przypadku emulsji, które znajdują zastosowanie w kosmetyce.
The influence of number of sieves through which the cosmetic emulsion base was produced on a droplet size was analyzed. The single-sieve system with two different mesh sizes was also analyzed, aiming to find the relationship between mass flow rate of peristaltic pump and droplet diameters of dispersed phase. The use of SEM-type mixers positively influences emulsion properties and enables one to obtain fine droplets and monodisperse emulsion which are advantage features in cosmetic emulsions.
Źródło:
Inżynieria i Aparatura Chemiczna; 2018, 4; 108--109
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STEM-EDX and FIB-SEM Tomography of ALLVAC 718Plus Superalloy
Autorzy:
Kruk, A.
Cempura, G.
Lech, S.
Czyrska-Filemonowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/354670.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TEM
SEM
STEM-EDX tomography
FIB-SEM tomography
Allvac 718Plus
Opis:
Allvac 718Plus (718Plus) is a high strength, corrosion resistant nickel- based superalloy used for application in power generation, aeronautics and aerospace industry. The 718Plus microstructure consists of a γ matrix with γ’-Ni3(Al,Ti) and some δ- Ni3Nb phases as well as lamellar particles (η-Ni3Ti, η*-Ni6AlNb or Ni6(Al,Ti)Nb) precipitated at the grain boundaries. The primary strengthening mechanism for this alloy is a precipitation hardening, therefore size and distribution of precipitates are critical for the performance of the alloy. The aim of this study was to characterize precipitates in the 718Plus superalloy using Scanning Transmission Electron Microscope combined with Energy Dispersive X-ray Spectroscopy (STEM-EDX) and Focused Ion Beam Scanning Electron Microscope (FIB-SEM). The STEM-EDX and FIB-SEM tomography techniques were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and EDX spectroscopy were used to reveal details of the 718Plus microstructure and allow determine chemical composition of the phases. The study showed that electron tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their 3D distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative TEM and SEM metallography.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 535-542
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granulation Of Porous Materials with Phase Change Material (PCM)
Autorzy:
Bien, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1955942.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
PCR
SEM
XRD
DSC
Opis:
The paper describes the research on the method of production of granulated phase-change materials (PCM) used in construction industry for the accumulation of thermal energy. As mineral materials for the granules preparation zeolite from fly ash Na-P1 and natural diatomite dust were used which were impregnated with paraffinic filtration waste and granulated using a combined granulation method. Obtained granules were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherm, and differential scanning calorimetry (DSC). Mechanical strength of the materials was determined in a “drop strength” test. Performed analyses revealed that mineral composition and micromorphology of the diatomite and zeolite granules were varied, with zeolite granules having higher mechanical strength.
Źródło:
Budownictwo i Architektura; 2021, 20, 3; 135-144
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
pH Dependent Degradation and Characterization of Geopolymer Structures Derived from Fly Ash
Autorzy:
Şahbudak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1033454.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Geopolymer
alkaline
pH
SEM
XRD
Opis:
Geopolymer structures are a relatively new family of un-fired ceramics that are produced by alkaline slurry of mixed alumina silicate-based materials. One of the most abundant geopolymer-forming powders is the fly ash. Fly ash is a waste product of thermic coal plants, which produce electricity by coal burning. Fly ashes contain mostly Ca, Al, Si and Fe oxide mixtures and compounds formed during the burning process, followed by sedimentation. The standardization is made by SiO₂ content. Class C ash has low silica content (<50 wt.%) and class F ash has a higher silica content (>50 wt.%). The fly ash, studied in this work, was obtained from Kangal Coal Plant. The NaOH was used as the geopolymer binder and curing was performed at 80% relative humidity, at 40°C in sealed plastic molds. The obtained cylinders were aged for one week before releasing from molds. pH dependent degradation was used to determine the ionic exchange of geopolymers into the solution. Afterwards, XRD and SEM were done to detect the structural changes of geopolymers.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 379-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimal Conditions to Degrade Low Density Polyethylene by Aspergillus terreus and niger
Autorzy:
Sáenz, Melina
Borodulina, Tamara
Diaz, Linda
Banchon, Carlos
Powiązania:
https://bibliotekanauki.pl/articles/124967.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Laccase
plastics
polymer
SEM
Czapek
Opis:
Plastics pollution is a major worldwide concern because there is strong evidence about marine influence on the human trophic chain. Thus, we experimented with the biodegradation of low density polyethylene (LDPE) by A. niger and A. terreus in order to increase the degradation rate without any co-substrate or photothermal treatment. Our contribution is to show how to degrade LDPE under minimum nutritional conditions using both LDPE and sucrose as carbon sources. Up to 30% weight loss was obtained by A. niger and A. terreus which were isolated from an Ecuadorian mangrove. The evidence of cracks and biomass growth on the LDPE surface samples showed the potential of both fungi species to operate under low nutrient concentrations. The outlook of the present work was focused on understanding the fungi survival under minimal conditions.
Źródło:
Journal of Ecological Engineering; 2019, 20, 6; 44-51
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric studies of nano structured BaTi1-xSnxO3 solid solutions
Autorzy:
Bitra, H. Ch. R.
Prasad, B. B. V. S. V.
Powiązania:
https://bibliotekanauki.pl/articles/412300.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
BTSx
XRD
SEM
dielectric constant
Opis:
BaTi1-xSnxO3 (BTSx) ceramics had been prepared by temperature sintering technique. Initially, the samples were calcined at a temperature at 900 °C for 2 hours, after that ball milling was done and then the samples were sintered at a temperature of 1150 °C for 3 hours. X-ray diffractometry, Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Dielectric measurements were carried out and structural, micro structural and elemental analyses were discussed in brief.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 191-201
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing time effects on the surface morphology of C–Pd films prepared on silicon covered with SiO2
Autorzy:
Kozlowski, M.
Radomska, J.
Wronka, H.
Czerwosz, E.
Firek, P.
Sobczak, K.
Dluzewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/949412.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Pd
carbon
film
SEM
TEM
Opis:
Morphology changes of C–Pd films prepared in physical vapor deposition (PVD) process and next annealed in a temperature of 650 °C during different time were studied. These studies were performed with electron microscopy methods (scanning SEM and transmission TEM). It was found that not annealed films are flat and they are composed of grains with composite character and size of 100–200 nm. Pd nanocrystallite of a diameter of a few nanometers in some carbon matrix was placed in these grains. For annealed films, a formation of palladium nanograins with different sizes and shapes as well as a porous carbon matrix were observed. High resolution TEM investigation was used to determine a structure of all these grains. An increase in duration time of annealing process led to diminishing of the porosity of carbon matrix and a number of Pd grains situated on the film surface. It was also stated that covering of Si with SiO2 layer prevents formation of palladium silicide.
Źródło:
Optica Applicata; 2013, 43, 1; 81-89
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ cech socjodemograficznych na wyniki modelowania ścieżkowego zjawisk satysfakcji i lojalności klientów
Influence of the socio-demographic factors on the results of the path relation models in the areas of customer satisfaction and loyalty
Autorzy:
Skowron, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/424907.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
modelowanie ścieżkowe
SEM
PLS
cechy socjodemograficzne
Opis:
Tematem artykułu jest próba odpowiedzi na pytanie: jak zmieniają się wyniki modelowania ścieżkowego w obszarze analizy zagadnień satysfakcji i lojalności klientów wraz ze zmianą cech socjodemograficznych respondentów? Autor przeprowadził analizę ścieżkową omawianych zjawisk marketingowych przy wykorzystaniu metody PLS w jednym okresie sprawozdawczym w perspektywie dwóch sektorów gospodarczych (lubelskie centra handlowe oraz banki) na próbach zróżnicowanych pod względem cech socjodemograficznych. Dzięki przeprowadzonym pomiarom możliwe było wykazanie, czy brane pod uwagę cechy respondentów mają istotny wpływ na uzyskiwane wyniki modelowania ścieżkowego. Pozwoliło to na sprecyzowanie rekomendacji co do doboru prób badawczych w analizie modelowania ścieżkowego prowadzonego w kilku następujących po sobie okresach sprawozdawczych.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2017, 4 (58); 22-36
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of CuO and V2O5 Effect on IR Spectra of Polycrystalline Bismuth Niobate
Autorzy:
Kuźniarska-Biernacka, I.
Lisińska-Czekaj, A.
Czekaj, D.
Powiązania:
https://bibliotekanauki.pl/articles/352587.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BiNbO4
ceramics
SEM
FTIR spectroscopy
Opis:
Bismuth niobate (BiNbO4) ceramics were fabricated by mixed oxide method and sintered by presureless sintering method. BiNbO4 ceramics doped with V2 O5 additive in amount 0.125 wt%, 0.250 wt% and 1 wt% of was sintered at T = 910°C whereas BiNbO4 ceramics doped with 2 wt% of CuO additive was sintered at T = 890°C and T = 910°C. It was found that V2 O5 additive improved morphology of the ceramic samples. However, the chemical composition of BiNbO4 ceramics in relation to bismuth oxide and niobium oxide manifested a tendency of lack of Bi2 O3 component. Absorption bands for the BiNbO4 compound were identified. FTIR band positions associated with NbO6 octahedra suggested that the crystal structure changes after V2 O5 incorporation.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 817-821
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodegradable Sansevieria cylindrica Leaves fiber/ Tamarind fruit fiber based Polymer hybrid composites on characterization
Autorzy:
Reddy, G. R.
Kumar, M. A.
Jayaramudu, J.
Powiązania:
https://bibliotekanauki.pl/articles/411831.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
hybrid composites
mechanical properties
thermal
SEM
Opis:
This paper deals with the preparation and characterization of epoxy tamarind fruit (Tf) and Sansevieria cylindrica (Sc) hybrid composites containing fiber 0:20, 5:15, 10:10, 15:5 and 20:0 of (Tf:Sc) combinations loading. Sansevieria cylindrica leaves were used in this paper for extracting fiber out of it and in the similar manner ripen Tamarind fruit was used to extract fiber. Two different fibers viz. tamarind fruit/ Sansevieria cylindrica fibers were loaded into the epoxy system to develop the hybrid composites. The tensile and flexural properties of the resulting 20 wt. % loading of Tf/Sc/epoxy hybrid composites were examined. The resulting hybrid composites of 20 wt. % Tf/Sc with varying combinations exhibit the optimum improvement of mechanical properties and dielectric strength. 2 °C rise in decomposition temperature and 5 °C rise glass transition temperature were observed from the TGA and DSC thermal analysis. The fractured cross sections of flexural samples were assessed their performance as a function of fiber loading of Tf/Sc/epoxy hybrid composites by SEM analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 2; 116-118
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interakcje wyładowania elektryczne - minerały
Inieraction sparks - minerals
Autorzy:
Pawlikowski, M.
Bożęcki, P.
Powiązania:
https://bibliotekanauki.pl/articles/343867.pdf
Data publikacji:
2015
Wydawca:
nakł. Maciej Pawlikowski
Tematy:
minerals
artificial sparks
SEM
minerały
iskry
Opis:
Wykonano eksperymenty polegające na bombardowaniu powierzchni kryształów przez wyładowania elektryczne. Kryształy umieszczono na elektrodzie w specjalnej rurce szklanej. Iskry wytwarzano przy pomocy specjalnego generatora. Powierzchnie kryształów w strefie wyładowań badano przy pomocy mikroskopu skaningowego z przystawką do analiz chemicznych (EDS). Stwierdzono powstawanie w bombardowanej powierzchni kryształów mikro kraterów. Uderzenia iskier spowodowały także w niektórych przypadkach powstanie ziarn czystych metali w pobliżu mikro kraterów.
Interaction minerals artificial sparks were examined using pyrite, galena, hematite an pyrrhotite - bornite were examined using specially constructed generator. The surface of crystals was examines using SEM-EDS after strong bombing by artificial spark. The erosion of surface and formation of micro crater was observed. Moreover activity of sparks led to the formation of new secondary product represented sometime by pure metals.
Źródło:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2015, 20; 1-24
1689-6742
Pojawia się w:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Mineral Wollastonite Particulate Filled Vinyl-Ester Resin Composites
Autorzy:
Amarababu, B.
Rangadu, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/412589.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
vinylester
wollastonite
SEM
TGA
mechanical properties
Opis:
In the present research presents influence of coupling agent 1 % triethoxymethyl silane sprayed on to the wollastonite particulate powder before it dispersed into the vinylester/composites. Firstly two different composites were developed in which wollastonite is filled with vinylester resin and same wollastonite was sprayed with coupling agent 1 % triethoxymethyl silane then filled with vinylester resin. The particle functionalization with a bi-functional coupling agent 1 % triethoxymethyl silane was observed to have a significant effect on the curing process and subsequent physical properties of the composites. Wollastonite functionalization favors the composite fabrication with a lower curing temperature as compared to the as-received particle filled vinyl ester resin composites. Thermogravimetric analysis showed an increased thermo-stability in the particles functionalized filled vinyl ester resin composites as compared to the unmodified particle filled counterparts. The uniform particle dispersion and the chemical bonding between filler and vinyl ester resin matrix were found to contribute to the increased thermal stability and enhanced tensile strength and modulus.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 18; 91-102
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behavior of pharmaceutically active dexketoprofen as sustainable corrosion Inhibitor for API X80 carbon steel in acidic medium
Autorzy:
Nkem, B. Iroha
Abosede, O. James
Powiązania:
https://bibliotekanauki.pl/articles/1076601.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption
Carbon steel
Dexketoprofen
Inhibition
SEM
Opis:
The inhibition of X80 carbon steel corrosion in 1 M HCl solution by dexketoprofen (DKP) was studied using weight loss (WL), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and scanning electron microscopy (SEM) techniques. The results indicated that DKP acts by way of adsorption as an effective protective inhibitor in the aggressive acid medium. The inhibition efficiency of DKP increased with concentration but was lower at higher temperature. The results of potentiodynamic polarization showed that DKP molecule behaved as a mixed type inhibitor by reducing both the anodic and the cathodic electrochemical reactions. Dexketoprofen was adsorbed on the X80 steel surface in accordance with Langmuir adsorption isotherm. SEM analyses supported formation of protective film on the X80 steel in the presence of DKP.
Źródło:
World News of Natural Sciences; 2019, 27; 22-37
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved photoresponse of porous silicon photodetectors by embedding CdS nanoparticles
Autorzy:
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1193949.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
Nanoparticles
PSi
Photodetector
SEM
XRD
Opis:
In this research, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p types silicon wafers with 15 mA/cm2 etching current densities and 15 min etching time on the formation nanosized pore array. PSi was characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nanoscale for PSi and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PSi. The atomic force microscopy investigation shows the rough silicon surface. Also, it is reported the preparation of colloidal CdS nanoparticles NPs prepared by laser ablation in liquid (LAL) technique by irradiating with a Nd:YAG laser pulses CdS target immersed in methanol and varying the laser fluence 1.32 J/cm2. The structural, morphological and optical of CdS NPs has been studied. XRD measurement disclosed that the CdS NPs were of wurtzite hexagonal crystal structure. Transmission electron microscopy (TEM) investigation revealed that the synthesized CdS particles are spherical and have an average particle size in the range of (25 nm). AFM investigations showed that the produced CdS particles have ball-shape with good disposability. The energy band gap of CdS NPs prepared with 1.32 J/cm2 laser fluence has been determined from optical properties and found to be in the range (2.9 eV). Optical constants of CdS NPs were determined from transmittance and reflectance spectra.The effect of CdS NPs diffusion on properties of PSi Photodetector have reported which reveals that improving in (Al/PSi/Si/Al). The results show that a linear relationship between 1/C2 and reverse bias voltage was obtained. The built-in potential have values depending on the etching time current density and laser flunce. Al/CdSe/PSi/Si/Al photodetector hetrojunction have two peaks of response located at 415 nm and (700 -800nm) with max sensitivity 0.6 A/W. The maximum specific detectivity is 6.8×〖10〗^12 cm•〖Hz〗^(1/2) 〖•W〗^(-1) at 770 nm wavelength.
Źródło:
World Scientific News; 2015, 19; 32-49
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of technological PVD process parameters on the topography, crystal and molecular structure of nanocomposite films containing palladium nanograins
Autorzy:
Rymarczyk, J.
Czerwosz, E.
Kozłowski, M.
Dłużewski, P.
Kowalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/778619.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
palladium
carbon
SEM
AFM
TEM
FTIR
Opis:
The paper describes the preparation and characteristics of films composed of Pd nanograins placed in carbonaceous matrix. Films were obtained in PVD (Physical Vapor Deposition) process from two sources containing: the first one – fullerene powder and the second one – palladium acetate. The topographical, morphological and structural changes due to different parameters of PVD process were studied with the use of Atomic Force Microscopy and Scanning Electron Microscopy, whereas the structure was studied with the application of the Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy methods. It was shown that topographical changes are connected with the decomposition ratio of Pd acetate as well as the form of carbonaceous matrix formed due to this decomposition. Palladium nanograins found in all films exhibit the fcc structure type and their diameter changes from 2 nm to 40 nm depending on the PVD process parameters.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 3; 18-24
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 243

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