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Wyświetlanie 1-15 z 401
Tytuł:
Selected Aspects of Manufacturing of Aluminium Sponge
Autorzy:
Stręk, A. M.
Lipowska, B.
Wańczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/355824.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal sponge
aluminium sponge
investment casting
precursor thickening
Opis:
The present article describes selected aspects of investment casting technology for manufacturing of open-cell aluminium. The main focus is, among others, on the precursor thickening. Two groups of total 30 samples were produced, basing on open-cell polyurethane foam used as the precursor. Each of the two sample groups was thickened with a different type of suspension consisting of carbonaceous substances and organic binders. The influence of the coating mixture type was compared, leading to conclusions regarding the desired composition and fluidity of the suspensions. Both sample groups of the obtained open-cell aluminium had stochastic cell distributions, the average pore diameter was 5.2 mm and the PPI index was 8. The apparent densities were respectively: 0.485 g/cm3 and 0.312 g/cm3 , which reflected the impact of the precursor coating. Additionally, samples from both groups differed in quality.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1145-1150
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segregation of Elements in Continuous Cast Carbon Steel Billets Designated for Long Products
Autorzy:
Hutny, A. M.
Warzecha, M.
Derda, W.
Wieczorek, P.
Powiązania:
https://bibliotekanauki.pl/articles/354222.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
billet
segregation
Opis:
This article presents research results concerning designation of the scope of segregation of elements by analysing the ingot, designated for hot rolling of long products. The research tests were performed under industrial conditions, during continuous casting production cycle of high carbon steels. From cc ingots with square cross-section of 160 mm samples having the length of 400 mm were collected, out of which two samples were cut up, the so-called templates with the thickness of 20 mm. Segregation of elements was determined based on the quantitative analysis of results performed by using spark spectrometry pursuant to PN-H-04045. Changes in concentrations of elements were analysed along the line, which join the opposite sides of the sample in their half length and pass through the geometric centre of the square cross-section. In the further course of the research study, there was also determined the segregation along perpendicular line up to the surface connecting the core of the cross-section with lateral plane. Designations of element contents were performed at points distanced from each other by approx. 10 mm and situated on the lines. There was found segregation of carbon, sulphur and phosphorus.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2037-2042
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segregation of Elements in Billets Made of Carbon Steels for Long Products
Autorzy:
Hutny, A. M.
Warzecha, M.
Wieczorek, P.
Derda, W.
Powiązania:
https://bibliotekanauki.pl/articles/354733.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steelmaking
continuous casting
billet
segregation
optical emission spectrometry
Opis:
The article presents the results of investigations performed on segregation of elements in the billets. The research were performed under standard industrial conditions, during high carbon steel production cycle. Probes (templates with the thickness of 20 mm) were taken from billets with square cross-section of 160 mm. Segregation of elements was determined based on the quantitative analysis of results performed by using spark spectrometry pursuant to PN-H-04045. Changes in concentrations of elements were analysed along two cross-sections. Element contents were performed at points distanced from each other by approx. 10 mm. The segregation of carbon, sulphur and phosphorus was determined for different billets.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2075-2079
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Steel Flow in the Tundish by Modifying its Working Area
Autorzy:
Warzecha, P.
Hutny, A. M.
Warzecha, M.
Merder, T.
Powiązania:
https://bibliotekanauki.pl/articles/354772.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tundish
continuous casting
numerical modelling
Opis:
Presented paper describes model investigations carried out on six-strand continuous casting tundish. Numerical analysis is based on simulations performed with the use of commercial code ANSYS Fluent. The analysis concerns determination of hydrodynamic conditions of the flow in the analysed tundish, with nominal capacity of 22 Mg, and its optimisation by modification of the flow structure in the tundish working area. Four different flow control devices (FCD) were proposed. Results of investigations presented in the paper include the distribution of velocity vectors and distribution of temperature and turbulence kinetic energy. Additionally, for more detailed comparative analysis, the macroscopic characteristics of residence time distribution (RTD) in the reactor, and the transition zone ranges were determined for each of the variants.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2071-2078
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrodynamic conditions of flow in the tundish depending on selected technological parameters for different steel groups
Autorzy:
Warzecha, M.
Merder, T.
Warzecha, P.
Hutny, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/353743.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steelmaking
continuous casting
tundish
numerical modelling
Opis:
The presented results of investigations are part of a larger study focused on the optimization of the flow and mixing of liquid steel in the industrial tundish of continuous casting machine. The numerical simulations were carried out concern the analysis of hydrodynamic conditions of liquid steel flow in a tundish operating in one of the national steelworks. Numerical simulations were performed using the commercial code ANSYS Fluent. The research concerns two different speeds of steel casting. In real conditions, these speeds are the most commonly used in the technological process when casting two different groups of steel. As a result of computational fluid dynamics (CFD) calculations, predicted spatial distributions of velocity and liquid steel turbulence fields and residence time distribution (RTD) curves were obtained. The volume fractions of different flows occurring in the tundish were also calculated. The results of the research allowed a detailed analysis of the influence of casting speed on the formation of hydrodynamic conditions prevailing in the reactor.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 65-70
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Shot Peening on the Fatigue Strength of Automotive Tubular Stabilizer Bars DC 218
Autorzy:
Wittek, A. M.
Gąska, D.
Łazarz, B.
Matyja, T.
Powiązania:
https://bibliotekanauki.pl/articles/353092.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shot-peening
residual stresses
fatigue
finite element method
Opis:
This paper concerns issues related to the development of designs of stabilizer bars for new motor vehicle models. It involves not only the designing of a stabilizer bar with the shape required by the manufacturer, but also the preparation of bending and heat treatment processes as well as the performance of strength and fatigue tests. In the prototype development phase, the simulations techniques (FEM) may be used to assess the design. The article contains a detailed analysis of a stabilizer bar designated with the DC 218 VA symbol. Performed numerical strength and fatigue calculations showed that the developed stabilizer bar design with the desired shape did not achieve the required number of fatigue cycles. It was also proven at the test stand by testing a prototype stabilizer bar. Therefore, it was suggested to supplement the technological process with an additional shot peening operation whose main aim was to reduce the length of microcracks on the stabilizer bar’s surface. This effect was confirmed during comparative metallographic tests of not shot – peened and shot – peened stabilizer bars. After shot peening, the analysed stabilizer bar reached a fatigue strength which exceeded the limits set by the manufacturer.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1963-1968
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Modelling of the Plastic Working Processes of Zirconium Alloy Bars and Tubes in Thermomechanical Conditions
Modelowanie fizyczne procesów przeróbki plastycznej prętów i rur ze stopu cyrkonu w warunkach termomechanicznych
Autorzy:
Kawałek, A.
Dyja, H.
Gałkin, A. M.
Ozhmegov, K.V.
Sawicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/353960.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zr-1%Nb
tube
physical modeling
hot
cold deformation
pręty
rury
modelowanie fizyczne
odkształcenie na zimno
Opis:
The article presents results of physical modelling of processes of plastic working of the modified Zr-1%Nb zirconium alloy, obtained using different methods of the plastometric testing. The „Gleeble 3800”‚ metallurgical process simulator, a DIL805 A/D dilatometer with a plastometric attachment, and a „Setaram‚ plastometer were used for testing. Based on the obtained testing results, the values of the yield stress and limiting plasticity of the tested alloy were determined for wide ranges of temperature variation (T=20÷950°C) and strain rate variation (ε=0.1÷15.0 s-1) under continuous loading conditions. It was found that by using different testing methods, different alloy properties, characteristic for a given plastic working process, could be obtained.
W artykule przedstawiono wyniki modelowania fizycznego procesów przeróbki plastycznej modyfikowanego stopu cyrkonu Zr-1%Nb, otrzymane za pomocą różnych metod badań plastometrycznych. Do badań zastosowano symulator procesów metalurgicznych „Gleeble 3800”‚ dylatometr DIL805 A/D z przystawką plastometryczną i plastometr „Setaram‚. Na podstawie otrzymanych wyników badań określono wartość naprężenia uplastyczniającego i plastyczności granicznej stopu dla szerokiego zakresu zmian temperatury (T=20÷950°C) i prędkości odkształcenia (ε=0.1÷15.0 s-1), w warunkach obciążania ciągłego. Stwierdzono, że stosując różne metody badawcze można uzyskać inne własności stopu, charakterystyczne dla danego procesu przeróbki plastycznej.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 935-940
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Aging and Degradation of Human Fingernail Plates Upon Cosmetic Agents
Autorzy:
Kulesza, S.
Bramowicz, M.
Gwoździk, M.
Wilczyński, S.
Goździejewska, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/354662.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Atomic Force Microscopy
Scanning Electron Microscopy
fractal characterization
nanoscale property mapping
Opis:
The knowledge whether and how chemical species react with tissues is important because of protection against harmful factors, diagnose of dermatological diseases, validation of dermatological procedures as well as effectiveness of topical therapies. In presented work the effects of chemical agents on plates of human fingernails were studied using Atomic Force Microscopy and Scanning Electron Microscopy. Apart from that, mapping of the elastic properties of the nails was also carried out. To obtain reliable measures of spatial evolution of the surface variations, recorded images were analyzed in terms of scaling invariance brought by fractal geometry, instead of common though not unique statistical measures.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 181-184
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Production Process and Material Factors an Fatigue Strength af Tubular Stabilizer Bar
Wpływ procesu produkcyjnego i czynników materiałowych na wytrzymałość zmęczeniową stabilizatora rurowego
Autorzy:
Wittek, A. M.
Burdzik, R.
Folęga, P.
Konieczny, Ł.
Łazarz, B.
Powiązania:
https://bibliotekanauki.pl/articles/352077.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stabilizer bar
metalographically test
FEM
TTT diagram
equivalent stresses
stabilizator rurowy
test metalograficzny
schemat TTT
wytrzymałość zmęczeniowa
Opis:
The paper presented results of the research on process of production of highly important element of passenger car. The main object of the research was influence of production process and material factors on fatigue strength of tubular stabilizer bar. The scope of the research included the stabilizer bar hot bent at the bending table, hardened in oil and tempered. The bending radii I, II and III were metalographically tested. The stabilizer bar was also subjected to fatigue tests. For analysis purpose the finite element method (FEM) calculation have been conducted. The analysis of relationship of outer diameter to wall thickness is very important. The analysed bar has broken early. The paper presents the reasons for premature failure of the tubular stabilizer bar.
W artykule przedstawiono wyniki badań procesu produkcji bardzo ważnego elementu zawieszenia pojazdu samochodowego. Głównym celem badań była analiza wpływu czynników procesu produkcyjnego i paramtetrów materiałowych na wytrzymałość zmęczeniową stabilizatora rurowego. Zakres badań obejmował gięty na gorąco stabilizator rurowy, hartowany w oleju i odpuszczany. Promienie gięcia I, II i III zostały poddane testom metalograficznym. Stabilizator poddano również testom zmęczeniowych. Dla celów analizy przeprowadzono obliczenia zmęczeniowe z wykorzystaniem MES. Niezwykle ważna jest analiza stosunku średnicy zewnętrznej do grubości ścianki. Badany stabilizator uległ przedwczesnemu zniszczeniu. W artykule przedstawiono przyczyny przedwczesnego uszkodzenia badanego stabilizatora rurowego.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2485-2492
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoinduced Operation by Absorption of the Chalcogenide Nanocrystallite Containing Solar Cells
Autorzy:
Elnaggar, A. M.
Albassam, A.
Oźga, K.
Jędryka, J.
Szota, M.
Myronchuk, G.
Powiązania:
https://bibliotekanauki.pl/articles/357002.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photovoltaic cell materials
chalcogenide layers
photoinduced absorption
laser treatment
nanocrystlalline treatment
Opis:
It is shown that for the solar cells containing chalcogenide nanocrystallites using external laser light, one can achieve some enhancement of the photovoltaic efficiency. Photoinduced treatment was carried out using two beams of splitted Er: glass laser operating at 1.54 μm. The light of the laser was incident at different angles and the angles between the beams also were varied. Also, the studies of nanocomposite effective structures have shown enhancement of effective nanocrystalline sizes during the laser treatment. Nanocrystallites of CuInS2 and CuZnSnS4 (CZTS) were used as chalcogenide materials. The optimization of the laser beam intensities and nanoparticle sizes were explored.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1953-1956
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State of the Art of Ex-Situ Aluminium Matrix Composite Fabrication through Friction Stir Processing
Autorzy:
Gangil, N.
Siddiquee, A. N.
Maheshwari, S.
Al-Ahmari, A. M.
Abidi, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/353721.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir processing
aluminium alloys
ex-situ composites
Opis:
Aluminium metal matrix composites (AMMCs) are the fastest developing materials for structural applications. Friction Stir Processing (FSP) has evolved as a promising surface composite fabrication technique mainly because it is an eco-friendly and solid-state process. A spurt in the interest of research community and a resulting huge research output makes it difficult to find relevant information to further the research with objectivity. To facilitate this, the present article addresses the current state of the art and development in surface metal matrix fabrication through FSP with a specific focus on ex-situ routes. The available literature has been carefully read and categorized to present effects of particle size, morphology and elemental composition. The effect of various reinforcements on development of different functional characteristics is also discussed. Effect of main FSP parameters on various responses is presented with objectivity. Based on the studied literature concluding summary is presented in a manner in which the literature becomes useful to the researchers working on this important technology.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 719-738
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UV-Induced Anisotropy in CdBr2-CdBr2: Cu Nanostructures
Anizotropia wywołana promieniowaniem UV w nanostrukturach CdBr2-CdBr2: Cu
Autorzy:
El-Naggar, A. M.
Albassam, A. A.
Oźga, K.
Szota, M.
Kityk, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/356453.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CdBr2-CdBr2: Cu nanocrystalline film
UV-induced anisotropy
optical properties
birefringence
layered crystals
warstwy nanokystaliczne CdBr2-CdBr2: Cu
anizotropia wywołana UV
właściwości optyczne
dwoistość
kryształy warstwowe
Opis:
We have found an occurrence of anisotropy in the nanostructure CdBr2-CdBr2: Cu nanocrystalline films. The film thickness was varied from 4 nm up to 80 nm. The films were prepared by successive deposition of the novel layers onto the basic nanocrystals. The detection of anisotropy was performed by occurrence of anisotropy in the polarized light at 633 nm He-Ne laser wavelength. The occurrence of anisotropy was substantially dependent on the film thickness and the photoinduced power density. Possible mechanisms of the observed phenomena are discussed.
Wykryto pojawienie się anizotropii w nanostrukturalnych warstwach nanokrystalicznych CdBr2-CdBr2: Cu. Grubość warstwy zmieniano w zakresie od 4 nm do 80 nm. Nanostrukturalne warstwy otrzymano poprzez kolejne osadzanie na nowych warstwach na podstawie nanokrystalitów. Detekcję anizotropii wykonano w spolaryzowanym świetle lasera gazowego He-Ne o długości fali 633 nm. Anizotropia optyczna występująca w warstwach w znacznym stopniu zależy od grubości warstwy i gęstości mocy indukowanej światłem. Omówiono możliwe mechanizmy obserwowanego zjawiska.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 2029-2032
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Styrene oxidation by copper(II) complexes salen-type encapsulated into NaY zeolite
Katalityczne utlenianie styrenu w obecności kompleksów miedzi(II) typu salen osadzonych na zeolicie NaY
Autorzy:
Kuźniarska-Biernacka, I.
Carvalho, M. A.
Correia Neves, I.
Fonseca, A. M.
Lisińska-Czekaj, A.
Czekaj, D.
Powiązania:
https://bibliotekanauki.pl/articles/352679.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper(II) complexes
Schiff base
NaY zeolite
kompleksy miedzi(II)
zasada Schiffa
zeolit NaY
Opis:
The copper(II) complex with a Schiff-base salen-type ligand has been encapsulated in the nanopores of a NaY zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. The encapsulated and non-encapsulated copper(II) complexes were screened as catalysts for styrene oxidation by using TBHP as the oxygen source in acetonitrile solvent. Under the optimized conditions, the catalysts exhibited moderate activity with higher selectivity to benzaldehyde. Both heterogeneous catalysts were found to be reusable after the catalytic cycle, but with some loss of activity.
Osadzenie kompleksu miedzi(II) z zasadą Schiffa typu salen na zeolicie typu NaY zostało przepowadzone za pomocą dwóch metod „flexible ligand" i „in situ”. Katalityczne właściwości otrzymanego kompleksu oraz jego heterogenizowanych analogów badano w reakcji utleniania styrenu w obecności TBHP. Jako rozpuszczalnik stosowano acetonitryl. Testowane katalizatory wykazują średnią aktywność katalityczną z tendencją wytwarzania aldehy du benzoesowego. Oba heterogenizowane katalizatory mogą być wykorzystywane ponownie bez utraty aktywności katalitycznych.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1291-1294
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Styrene epoxidation over heterogeneous manganese (III) complexes
Autorzy:
Kuźniarska-Biernacka, I.
Lisinska-Czekaj, A.
Czekaj, D.
Alves, M. J.
Fonseca, A. M.
Neves, I. C.
Powiązania:
https://bibliotekanauki.pl/articles/958207.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
styrene epoxidation
heterogeneous manganes
Opis:
The manganes (III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese (LTI) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1477-1482
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
Autorzy:
Hussin, Rosniza
Hanafi, F.
Rashid, R. A.
Harun, Z.
Kamdi, Z.
Ibrahim, S. A.
Ainuddin, A. R.
Rahman, W.
Leman, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2134100.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sol-gel
zinc oxide
ZnO
thin films
nanostructured
Opis:
In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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