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Wyszukujesz frazę "krzepnięcie" wg kryterium: Temat


Tytuł:
An analytical method for solving the two-phase inverse Stefan problem
Autorzy:
Hetmaniok, E.
Słota, D.
Wituła, R.
Zielonka, A.
Powiązania:
https://bibliotekanauki.pl/articles/200444.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Inverse Stefan problem
homotopy analysis method
heat transfer
solidification
przepływ ciepła
krzepnięcie
homotopijna metoda analizy
Opis:
In the paper we present an application of the homotopy analysis method for solving the two-phase inverse Stefan problem. In the proposed approach a series is created, having elements which satisfy some differential equation following from the investigated problem. We reveal, in the paper, that if this series is convergent then its sum determines the solution of the original equation. A sufficient condition for this convergence is formulated. Moreover, the estimation of the error of the approximate solution, obtained by taking the partial sum of the considered series, is given. Additionally, we present an example illustrating an application of the described method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 583-590
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analitycal method of determining the freezing front location
Analityczna metoda wyznaczania położenia frontu krzepnięcia
Autorzy:
Hetmaniok, E.
Pleszczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/87347.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
krzepnięcie
metoda analityczna
warunek brzegowy
solidification
analytical method
boundary condition
Opis:
In this paper an analytical method of solving the selected class of problems which can be reduced to the one-phase solidification problem of a plate with the unknown a priori, varying in time boundary of the region in which the solution is sought.
W artykule przedstawiono analityczną metodę rozwiązywania wybranej klasy problemów, które można sprowadzić do jednofazowego zagadnienia krzepnięcia płyty z nieznaną a priori zmienną w czasie granicą obszaru, w którym poszukiwane jest rozwiązanie.
Źródło:
Zeszyty Naukowe. Matematyka Stosowana / Politechnika Śląska; 2011, 1; 121-136
2084-073X
Pojawia się w:
Zeszyty Naukowe. Matematyka Stosowana / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza procesu zalewania i krzepnięcia odlewów ze staliwa stopowego przeznaczonego do pracy w niskich temperaturach
Analysis of the pouring and solidification process of alloyed steel castings for low - temperature performance
Autorzy:
Gwiżdż, A.
Pirowski, Z.
Pysz, S.
Żuczek, R.
Dworak, P.
Powiązania:
https://bibliotekanauki.pl/articles/391755.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
symulacja
proces zalewania
krzepnięcie
porowatość
wady odlewów
simulation
pouring process
solidification
porosity
casting defects
Opis:
Przedstawiona praca stanowiła część badań przemysłowych (stosowanych) wykonywanych w ramach projektu celowego ROW-II-403/2008 realizowanego w MAGNUS-NORD Sp z o.o w Toruniu. Przeprowadzono symulację zalewania i krzepnięcia dwóch dużych odlewów staliwnych o masie: I - około 200 kg i II - około 700 kg, wg dotychczas stosowanej technologii. Po analizie wyników symulacji zaproponowano zmiany w technologii odlewania. Po wprowadzeniu zmian w technologii, ponownie przeprowadzono symulację komputerową. Analiza jej wyników wykazała zdecydowaną poprawę warunków krzepnięcia i wyeliminowanie powstających porowatości i jam skurczowych.
The study forms a part of the program of applied industrial research executed under Target Project No. ROW-II-403/2008 at MAGNUS-NORD Sp z o.o in Toruń. Pouring and solidification of two large steel castings weighing 200 kg (casting I) and 700 kg (casting II) was simulated, basing on the casting manufacturing technology used up to now. Detailed analysis of the results of simulation resulted in changes proposed and introduced to the so far used manufacturing technology. After the said changes had been introduced, the simulation of the casting process was done once again. The analysis of the obtained results indicated a substantial improvement in the solidification conditions and effectively eliminated the porosities and shrinkage cavities.
Źródło:
Prace Instytutu Odlewnictwa; 2009, 49, 1; 43-52
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Validation of Database in Computer Aided Design of Jewellery Casting
Autorzy:
Ignaszak, Z.
Wojciechowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/382474.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting of jewelry
Au-Ag-Cu alloy
computer design
thermal analysis
solidification
CAE system
NF&S
quality
odlewanie biżuterii
stop Au-Ag-Cu
projektowanie komputerowe
analiza termiczna
krzepnięcie
system CAE
jakość
Opis:
An overview of the bibliography regarding the connection of knowledge about precious metal alloys and aspects of the use of computer aided technologies to the optimization of the jewelry casting processes is presented. An analysis of the usability of selected CAx systems was made: 1) for spatial design, called Rhinoceros 6 and 2) CAE system: NovaFlow & Solid (NF&S). The authors describe own research including data acquisition and evaluation of temperature variations during solidification of the selected Au-Ag-Cu alloy, with the identification of the phase transformations of this alloy. The intensity of heat exchange was changed (cooling of specimens under ambient temperature conditions – "normal" intensity and with the furnace – very slow cooling). The problem of completing the simulation database was pointed out and analyzed. Examples of simulations of casting selected jewelry (ring and signet) were given and compared with the result of the experiment realized in real conditions. It was confirmed that the optimization by combining experimental and simulation studies allows for the acquisition of new knowledge, and also facilitates the creation of new artistic designs of jewelry as well as performing the feasibility check, and then optimizing the chosen technology.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 9-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Defects in Castings Cast by Rheocasting Method SEED
Autorzy:
Bryksi Stunova, B.
Bryksi, V.
Powiązania:
https://bibliotekanauki.pl/articles/381889.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
innovative foundry technologies
innovative foundry materials
rheocasting
casting defects
simulation
krzepnięcie
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
wady odlewów
symulacja
Opis:
The paper analyses specific defects of castings produced by semi-solid casting process, especially rheocasting method SEED, which uses mechanical swirling for reaching proper structure in semisolid state with high content of solid fraction. Heat treated alloy AlSi7Mg0.3 was applied for producing an Engine Bracket casting part. For observing structure, metallographic observation by light and SEM microscopy was used. To analyse the process, software ProCAST was used to simulate the movements in shot chamber and filling of the mold.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 15-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of solidification parameters and macrostructure of IN-713C castings after complex modification
Autorzy:
Binczyk, F.
Gradoń, P.
Powiązania:
https://bibliotekanauki.pl/articles/379884.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nickel alloy
superalloy
modification
inoculation
solidification
thermal analysis
macrostructure
stop niklu
nadstop
modyfikacja
inokulacja
krzepnięcie
analiza termiczna
makrostruktura
Opis:
The paper presents a research results concerning impact of volume modification (ceramic filter containning cobalt aluminate and hafnium powder) and simultaneous surface and volume modification on solidification and stereological parameters of macrostructure of castings made from post-production scrap of nickel superalloy IN-713C. Research included investigation of the influence of chemical composition on the temperature Tliq i Tsol and evaluation of following macrostructure parameters: the number of grains per mm2, average grain area and shape coefficient. Results indicate high influence of carbon content on Tliq. Macrostructure of sample castings indicate positive effect of surface and volume modification, however impact of surface modification is more pronounced.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 5-8
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Temperature and Velocity Fields During Filling of Continuous Casting Mould
Autorzy:
Sowa, L.
Skrzypczak, T.
Kwiatoń, P.
Powiązania:
https://bibliotekanauki.pl/articles/379679.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
continuous casting
numerical simulation
molten metal flow
krzepnięcie
odlewanie
symulacja numeryczna
Opis:
In this paper, the mathematical model and numerical simulations of the molten steel flow by the submerged entry nozzle and the filling process of the continuous casting mould cavity are presented. In the mathematical model, the temperature fields were obtained by solving the energy equation, while the velocity fields were calculated by solving the momentum equations and the continuity equation. These equations contain the turbulent viscosity which is found by solving two additional transport equations for the turbulent kinetic energy and its rate of dissipation. In the numerical simulations, coupling of the thermal and fluid flow phenomena by changes in the thermophysical parameters of alloy depending on the temperature has been taken into consideration. This problem (2D) was solved by using the finite element method. Numerical simulations of filling the continuous casting mould cavity were performed for two variants of liquid metal pouring. The effect of the cases of pouring the continuous casting mould on the velocity fields and the solid phase growth kinetics in the process of filling the continuous casting mould was evaluated as these magnitudes have an influence on the high quality of the continuous cast steel slab.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 115-118
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the solidification and properties of plaster cast Al based composites
Analiza krzepnięcia i właściwości odlewanych kompozytów na bazie aluminium
Autorzy:
Egizabal, P.
García Romero, A.
Torregaray, A.
Powiązania:
https://bibliotekanauki.pl/articles/354555.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
F3S.20S
MMCs
odlewy gipsowe
krzepnięcie
lost wax
plaster casting
solidification
Opis:
The present work deals with aspects related to the solidification and properties of an Al-Si10Mg/SiC20p alloy cast in plaster moulds. Several strategies were followed to shorten its solidification time such as embedding copper tubes into the mould to make circulate cooling fluids immediately after the casting step. The analysis of cooling curves provided valuable information on the effect of the particles on solidification events. The precipitation of different phases of the MMC takes place at higher temperatures and earlier than in the case of the non reinforced alloy. Particles affect the solidification pattern of the alloy and play a noticeable role in the precipitation of the phases. This fact should be taken into account to design the filling and feeding systems correctly and for modelling and processing parameters as well as in thermal treatments. Eventually samples were obtained under the highest solidification rate conditions to analyse the microstructure and tensile properties of the MMC material.
Praca przedstawia aspekty związane z krzepnięciem i właściwościami stopów Al-Si10Mg/SiC20p odlewanych w formach gipsowych. Aby skrócić czas krzepnięcia stopu testowano kilka strategii, takich jak osadzanie rur miedzianych w formie aby umożliwić obieg cieczy chłodzących natychmiast po odlaniu stopu. Analiza krzywych chłodzenia dostarczyłacennych informacji na temat wpływu cząstek na proces krzepnięcia. Wydzielanie różnych faz w kompozytach metalowo-ceramicznych odbywa się w wyższych temperaturach i wcześniej, niż w przypadku nieumacnianego stopu. Cząstki wpływają na schemat krzepnięcia stopu i odgrywają zauważalną rolę w wydzielaniu faz. Fakt ten powinien być brany pod uwagę przy projektowaniu prawidłowego systemu zalewania formy, modelowaniu parametrów procesu, jak również obróbki cieplnej. Na koniec pobrano próbki otrzymane przy najwyższej szybkości krzepnięcia do analizy mikrostruktury i właściwości wytrzymałościowych kompozytu metalowo-ceramicznego.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 1; 119-125
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic in Situ Metal Matrix Composite Reinforced with VC Carbide Fibres
Autorzy:
Kawalec, M.
Górny, M.
Sikora, G.
Powiązania:
https://bibliotekanauki.pl/articles/381579.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast composite
directional solidification
vanadium eutectic
vanadium carbide
microstructure
kompozyt odlewany
krzepnięcie kierunkowe
węglik wanadu
Opis:
A eutectic reaction is a basic liquid-solid transformation, which can be used in the fabrication of high-strength in situ composites. In this study an attempt was made to ensure directional solidification of Fe-C-V alloy with hypereutectic microstructure. In this alloy, the crystallisation of regular fibrous eutectic and primary carbides with the shape of non-faceted dendrites takes place. According to the data given in technical literature, this type of eutectic is suitable for the fabrication of in-situ composites, owing to the fact that a flat solidification front is formed accompanied by the presence of two phases, where one of the phases can crystallise in the form of elongated fibres. In the present study an attempt was also made to produce directionally solidifying vanadium eutectic using an apparatus with a very high temperature gradient amounting to 380 W/cm at a rate of 3 mm/h. Alloy microstructure was examined in both the initial state and after directional solidification. It was demonstrated that the resulting microstructure is of a non-homogeneous character, and the process of directional solidification leads to an oriented arrangement of both the eutectic fibres and primary carbides.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 21-24
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Mechanism of Pore Formation in Directionally Solidified A356 Alloy
Autorzy:
Uludag, M.
Dispinar, D.
Powiązania:
https://bibliotekanauki.pl/articles/380892.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
krzepnięcie kierunkowe
porowatość
ziarna
odlewy
directional solidification
porosity
bifilm index
grain refinement
casting
Opis:
It is well-known that the better the control of the liquid aluminium allows obtaining of better properties. One of the most important defects that is held responsible for lower properties has been the presence of porosity. Porosity has always been associated with the amount of dissolved hydrogen in the liquid. However, it was shown that hydrogen was not the major source but only a contributor the porosity. The most important defect that causes porosity is the presence of bifilms. These defects are surface entrained mainly due to turbulence and uncontrolled melt transfer. In this work, a cylindrical mould was designed (Ø30 x 300 mm) both from sand and die. Moulds were produced both from sand and die. Water cooled copper chill was placed at the bottom of the mould in order to generate a directional solidification. After the melt was prepared, prior to casting of the DC cast samples, reduced pressure test sample was taken to measure the melt quality (i.e. bifilm index). The cast parts were then sectioned into regions and longitudinal and transverse areas were investigated metallographically. Pore size, shape and distribution was measured by image analysis. The formation of porosity was evaluated by means of bifilm content, size and distribution in A356 alloy.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 157-162
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of phase-change boundary position in continuous casting
Autorzy:
Ivanova, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/380559.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
information technology
foundry industry
mathematical modeling
temperature distribution
Stefan condition
phase change boundary
continuous casting
krzepnięcie stopu
technologia informacyjna
przemysł odlewniczy
modelowanie matematyczne
rozkład temperatury
warunek Stefana
granica międzyfazowa
odlewanie ciągłe
Opis:
The problem of determination of the phase-change boundary position at the mathematical modeling of continuous ingot temperature field is considered. The description of the heat transfer process takes into account the dependence of the thermal physical characteristics on the temperature, so that the mathematical model is based on the nonlinear partial differential equations. The boundary position between liquid and solid phase is given by the temperatures equality condition and the Stefan condition for the two-dimensional case. The new method of calculation of the phase-change boundary position is proposed. This method based on the finite-differences with using explicit schemes and on the iteration method of solving of non-linear system equations. The proposed method of calculation is many times faster than the real time. So that it amenable to be used for model predictive control of continuous semifinished product solidification.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 57-62
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Change of aluminum alloys structure by sono-solidification
Autorzy:
Gnapowski, S.
Tsunekawa, Y.
Okumiya, M.
Lenik, K.
Powiązania:
https://bibliotekanauki.pl/articles/382741.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic vibration
sono solidification
Al-Si alloy
grain size
solidification temperature
drgania ultradźwiękowe
krzepnięcie
stop Al-Si
wielkość ziarna
temperatura krzepnięcia
Opis:
This experiment utilized five Aluminum alloys with silicon content percentages of 7, 10, 12.6, 14.5 and 17(wt)%. Ultrasonic vibration was applied to improved the quality of aluminum alloys. Sono-solidification, in which ultrasound vibrations are applied to molten metal during its solidification, is expected to cause improved mechanical properties due to grain refinement. Observed by microstructure photographs was that grains became smaller and their shapes more regular. Using ultra sound solidification α Al appeared during ultrasound treatment the eutectic solidification time was longest around 10% compared with same condition experiment without ultrasound treatment.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 39-42
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies of the effect of various additives on structure and mechanical properties of CuAl10Fe3Mn2 alloy
Badania porównawcze wpływu różnych dodatków na strukturę i właściwości mechaniczne stopu CuAl10Fe3Mn2
Autorzy:
Gazda, A.
Górny, Z.
Kluska-Nawarecka, S.
Połcik, H.
Warmuzek, M.
Powiązania:
https://bibliotekanauki.pl/articles/391729.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
badania porównawcze brązów aluminiowych
modyfikacja
krzepnięcie
właściwości mechaniczne
struktura
comperative studies
aluminium bronzes
modification
solidification
mechanical properties
structure
Opis:
Comparative studies were made on modification of aluminium CuAl10Fe3Mn2 bronze by application of modifiers affecting changes in surface properties (Na, K, Ca, Mg) and providing additional substrates for crystallisation (Zr, Ti, B). The results of structure examinations (optical microscope and scanning electron microscope), solidification kinetics analysis (thermal analysis), dilatometry, calorimetry, and mechanical tests were used.
Prowadzono badania porównawcze modyfikacji brązu aluminiowego CuAl10Fe3Mn2, stosując modyfikatory powodujące zmiany właściwości powierzchniowych (Na, K, Ca, Mg), jak również powstawanie dodatkowych miejsc krystalizacji (Zr, Ti, B). Wykorzystano wyniki badania struktury prowadzone techniką mikroskopii optycznej i skaningowej mikroskopii elektronowej, analizę kinetyki krzepnięcia (analiza termiczna), dylatometrię, kalorymetrię i wyniki badania właściwości mechanicznych.
Źródło:
Prace Instytutu Odlewnictwa; 2009, 49, 1; 5-26
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Reagent Efficiency in Reduction of Copper from the Slags in Conditions of the Smelter & Refinery Plant - Głogów
Autorzy:
Wołczyński, W.
Migas, P.
Bydałek, A. W.
Najman, K.
Senderowski, C.
Kwapisiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/382620.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
copper droplets
complex reagent
slag
thermo-chemical treatment
krzepnięcie
miedź
odczynniki
żużel
obróbka cieplno-chemiczna
Opis:
The copper droplets contained in the post-processing liquid slag are subjected to the treatment by the complex reagent. The complex reagent has been recently elaborated and patented in frame of the Grant No. PBS3/A5/45/2015. In particular, the complex reagent is dedicated to the post-processing slags coming from the Smelter and Refinery Plant, Głogów, as a product of the direct-to-blister technology performed in the flash furnace. The recently patented complex reagent effectively assists not only in agglomeration, and coagulation but also in the deposition of the copper droplets at the bottom of crucible / furnace as well. The treatment of the post-processing slags by the complex reagent was performed in the BOLMET S.A. Company as in the industrial conditions which were similar to those usually applied in the KGHM – Polish Copper (Smelter and Refinery Plant, Głogów). The competition between buoyancy force and gravity is studied from the viewpoint of the required deposition of coagulated copper droplets. The applied complex reagent improves sufficiently the surface free energy of the copper droplets. In the result, the mechanical equilibrium between coagulated copper droplets and surrounding liquid slag is properly modified. Finally, sufficiently large copper droplets are subjected to a settlement on the crucible / furnace bottom according to the requirements.
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 86-90
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer- Aided Design of Steel Casting Taking into Account the Feeding Ability
Autorzy:
Polyakov, S.
Kuzyi, O.
Korotschenko, A.
Korovin, V.
Bast, J.
Powiązania:
https://bibliotekanauki.pl/articles/382561.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computer-aided design
casting
solidification
cast designer
freeCAD
feeding ability
riser
projektowanie wspomagane komputerowo
odlew
krzepnięcie
Opis:
A new Computer-Aided Design approach is introduced for design of steel castings taking into account the feeding ability in sand moulds. This approach uses the geometrical modeling by a CAD-program, in which the modul “Castdesigner” is implemented, which includes the feeding models of steel castings. Furthermore, the feeding ability is guaranteed immediately during the design by an interactive geometry change of the casting cross section, so that a directional feeding of the solidifying casting from the installed risers is assured.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 49-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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