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Tytuł:
Covid pandemic as a disruptive factor enhancing ICT use in social sciences’ teaching practices
Autorzy:
Maruszewska, Ewa Wanda
Eisenbardt, Monika
Tuszkiewicz, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/27313583.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
Covid
technology in teaching
activity theory
ICT use
higher education
technologia w nauczaniu
teoria działań
zastosowanie technologii ICT
wyższa edukacja
Opis:
Purpose: Our research attempts to understand a change in social sciences’ academics' teaching practices that can be observed during the COVID pandemic and that are predicted after the pandemic. Design: We investigate – in the light of the Blin’s and Munro’s activity theory (2008) – whether the COVID pandemic is a disruptive factor that may lead to the transformation of social sciences academics’ teaching practices. The research instrument was a worldwide survey conducted among social sciences’ academics. Findings: COVID pandemic has already introduced changes into academics’ teaching practices in a form of broad ICT usage as well as initiated changes in the teaching activities design. Research limitations: The number of responses is limited to 382 with only a collection of 77 responses from outside of Europe. We applied a general approach for ICT means not asking respondents about particular ICT tools. COVID as a pandemic evolves continuously indicating the need for further, in-depth research in this field. Practical implications: COVID pandemic might serve as a disruptive factor enforcing further changes in social sciences’ academic teaching practices after the pandemic. Social implications: Our results indicate that the quality of social sciences teaching has worsened during the pandemic and most of the respondents do not predict significant changes in the quality of teaching after the pandemic compared to the quality of teaching before the pandemic. Originality: We contribute by showing that introduction of a new tool (ICT) and modified teaching activity design resulted in a serious alteration of the teaching practice of social sciences’ academics. We did not confirm that COVID disruption was expansive enough to permanently transform teaching practices of social sciences academics, hence we suggest that obstacles to successful incorporation of ICT in teaching practices are still present. We showed that ICT is predicted to be used more frequently rather than before (when it was only utilised as a platform to transfer traditional material) and will not modify the well-established practices referring to instructional tools. Our study suggests that the relation between teacher and teaching activity design is not mediated by ICT tools, which may result in resistance from the teachers.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 160; 383--407
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Verification of the Cast Iron Solidification Model
Autorzy:
Mendakiewicz, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2174627.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
solidification process
numerical techniques
thermal analysis
derivative analysis
przemysł odlewniczy
zastosowanie technologii informatycznych
krzepnięcie
techniki numeryczne
analiza termiczna
Opis:
The article concerns the experimental verification of the numerical model simulating the solidification and cooling processes proceeding in the domain of cast iron casting. The approximate course of the function describing the evolution of latent heat and the value of substitute specific heat resulting from its course were obtained using the thermal and derivative analysis (TDA) method The TDA was also used to measure the cooling curves at the distinguished points of the casting. The results obtained in this way were compared with the calculated cooling curves at the same points. At the stage of numerical computations, the explicit scheme of the finite difference method was applied. The agreement between the measured and calculated cooling curves is fully satisfactory.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 91--94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Values of Diffusion Coefficient on Results of Diffusion Modelling Driven by Chemical Potential Gradien
Autorzy:
Wróbel, Marek
Burbelko, Andriy
Powiązania:
https://bibliotekanauki.pl/articles/2174626.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
diffusion modelling
Calphad method
chemical potential
diffusion coefficient
przemysł odlewniczy
zastosowanie technologii informatycznej
modelowanie dyfuzyjne
metoda Calphad
potencjał chemiczny
współczynnik dyfuzji
Opis:
In the paper critical role of including the right material parameters, as input values for computer modelling, is stressed. The presented model of diffusion, based on chemical potential gradient, in order to perform calculations, requires a parameter called mobility, which can be calculated using the diffusion coefficient. When analysing the diffusion problem, it is a common practice to assume the diffusion coefficient to be a constant within the range of temperature and chemical composition considered. By doing so the calculations are considerably simplified at the cost of the accuracy of the results. In order to make a reasoned decision, whether this simplification is desirable for particular systems and conditions, its impact on the accuracy of calculations needs to be assessed. The paper presents such evaluation by comparing results of modelling with a constant value of diffusion coefficient to results where the dependency of Di on temperature, chemical composition or both are added. The results show how a given deviation of diffusivity is correlated with the change in the final results. Simulations were performed in a single dimension for the FCC phase in Fe-C, Fe-Si and Fe-Mn systems. Different initial compositions and temperature profiles were used.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 81--90
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology for Diagnosing the Causes of Die-Casting Defects, Based on Advanced Big Data Modelling
Autorzy:
Okuniewska, A.
Perzyk, M. A.
Kozłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2126910.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
die casting
castings defects
process control
data analytics
application of information technology
przemysł odlewniczy
odlewanie ciśnieniowe
wady odlewów
kontrola procesu
analiza danych
zastosowanie technologii informatycznych
Opis:
The purpose of this paper was to develop a methodology for diagnosing the causes of die-casting defects based on advanced modelling, to correctly diagnose and identify process parameters that have a significant impact on product defect generation, optimize the process parameters and rise the products’ quality, thereby improving the manufacturing process efficiency. The industrial data used for modelling came from foundry being a leading manufacturer of the high-pressure die-casting production process of aluminum cylinder blocks for the world's leading automotive brands. The paper presents some aspects related to data analytics in the era of Industry 4.0. and Smart Factory concepts. The methodology includes computation tools for advanced data analysis and modelling, such as ANOVA (analysis of variance), ANN (artificial neural networks) both applied on the Statistica platform, then gradient and evolutionary optimization methods applied in MS Excel program’s Solver add-in. The main features of the presented methodology are explained and presented in tables and illustrated with appropriate graphs. All opportunities and risks of implementing data-driven modelling systems in high-pressure die-casting processes have been considered.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 103--109
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production Scheduling for the Two Furnaces – One Casting Line System
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/383276.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heuristics
application of information technology
foundry industry
scheduling
production planning
heurystyka
zastosowanie technologii informatycznej
przemysł odlewniczy
planowanie
planowanie produkcji
Opis:
The paper presents a production scheduling problem in a foundry equipped with two furnaces and one casting line, where the line is a bottleneck and furnaces, of the same capacity, work in parallel. The amount of produced castings may not exceed the capacity of the line and the furnaces, and their loads determine metal type from which the products are manufactured on the casting line. The purpose of planning is to create the processing order of metal production to prevent delays in the delivery of the ordered products to the customers. The problem is a mix of a lot-sizing and scheduling problems on two machines (the furnaces) run in parallel. The article gives a mathematical model that defines the optimization problem, and its relaxed version based on the concept of a rolling-horizon planning. The proposed approaches, i.e. commercial solver and Iterated Local Search (ILS) heuristic, were tested on a sample data and different problem sizes. The tests have shown that rolling horizon approach gives the best results for most problems, however, developed ILS algorithm gives better results for the largest problem instances with tight furnace capacity.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying arduino for controlling car parking system
Autorzy:
Al-Tabatabaie, Kusay F.
Abdulameer, Sadeer D.
Powiązania:
https://bibliotekanauki.pl/articles/1395586.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
adoption
appropriation
wireless technology application
przyjęcie
zawłaszczenie
zastosowanie technologii bezprzewodowej
Opis:
With increasing automobiles in the parking space, we could face problems like unplanned parking, lack of discipline, wasting time and fuel while looking for free space around the parking ground. These problems could be solved by applying Arduino for controlling car parking system. The proposed system will detect an available parking slot in short time, saves fuel, offer monitoring car parking system with low consumption, easy to implement and inexpensive.
Źródło:
Applied Computer Science; 2019, 15, 2; 53-62
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated Analytical and Measurement System for the Evaluation of the Properties of Cast Metals and Alloys
Autorzy:
Biernat, S.
Bydałek, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/380877.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
solidification process
brass
hardness
przemysł odlewniczy
zastosowanie technologii informatycznych
krzepnięcie
mosiądz
twardość
Opis:
The article presents an integrated analytical and measurement system for evaluation of the properties of cast metals and alloys. The presented platform is an extension of the SLAG - PROP application with new modules, which allow to use information on metallurgical processes in an even more effective way, as well as to evaluate the finished product. In addition, the construction of a measuring station for the analysis of thermal processes taking place in a metal bath allows for precise observation of phenomena together with their appropriate interpretation. The article presents not only the cooling curves of certain copper alloys. The analysis also covered mechanical properties related to hardness, finished products depending on the mold in which the products were cast. In the literature one can find information about the mechanical properties of products in the improved state, usually after plastic or thermal treatment, omitting their properties obtained as a result of a naturally made casting. The article also presents the method of placing information in the database using a convenient graphical tool.
Źródło:
Archives of Foundry Engineering; 2019, 1; 13-18
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Introducing Advanced Data Analytics in Perspective of Industry 4.0 in a Die Casting Foundry
Autorzy:
Perzyk, M.
Dybowski, B.
Kozłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/381424.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
mechanical properties
die casting
process control
data analytics
zastosowanie technologii informatycznych
przemysł odlewniczy
właściwości mechaniczne
odlewanie
kontrola procesu
analityka danych
Opis:
The paper presents some aspects of a development project related to Industry 4.0 that was executed at Nemak, a leading manufacturer of the aluminium castings for the automotive industry, in its high pressure die casting foundry in Poland. The developed data analytics system aims at predicting the casting quality basing on the production data. The objective is to use these data for optimizing process parameters to raise the products’ quality as well as to improve the productivity. Characterization of the production data including the recorded process parameters and the role of mechanical properties of the castings as the process outputs is presented. The system incorporates advanced data analytics and computation tools based on the analysis of variance (ANOVA) and applying an MS Excel platform. It enables the foundry engineers and operators finding the most efficient process variables to ensure high mechanical properties of the aluminium engine block castings. The main features of the system are explained and illustrated by appropriate graphs. Chances and threats connected with applications of the data-driven modelling in die casting are discussed.
Źródło:
Archives of Foundry Engineering; 2019, 1; 53-57
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Use of Instruments for More Accurate Wax Pattern Blade Segment Production
Autorzy:
Herman, A.
Kubelková, I.
Vrátný, O.
Powiązania:
https://bibliotekanauki.pl/articles/381106.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
innovative foundry technologies
innovative materials
Investment casting
gas turbines
infrared thermography
simulation
przemysł odlewniczy
zastosowanie technologii informatycznej
innowacyjne technologie odlewnicze
innowacyjne materiały
turbiny gazowe
symulacja
Opis:
Precision casting is currently motivated by high demand especially for castings for the aerospace, automotive and gas turbine industries. High demands on precision of this parts pressure foundries to search for the new tools which can help them to improve the production. One of these tools is the numerical simulation of injection process, whereas such software especially for investment casting wax injection, process does not exist yet and for this case must be the existing software, for alloys or plastic, modified. This paper focuses on the use of numerical simulations to predict the behavior of injected models of gas turbine blades segments. The properties of wax mixtures, which were imported into the Cadmould simulation software as a material model, were found. The results of the simulations were verified using the results of 3D scanning measurements of wax models. As a supporting technology for verifying the results was used the Infrared Thermography.
Źródło:
Archives of Foundry Engineering; 2019, 2; 101-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stresses in the Accessories of Heat Treatment Furnaces vs Cooling Kinetics
Autorzy:
Bajwoluk, A.
Gutowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/382585.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
information technology
grates
thermal stresses
heat treatment equipment
przemysł odlewniczy
zastosowanie technologii informatycznej
technologia informatyczna
ruszty
naprężenia termiczne
sprzęt do obróbki cieplnej
Opis:
Depending on the course of the processes of heat treatment and thermo-chemical treatment, the technological equipment of heat treatment furnaces is exposed to different operating conditions, as the said processes differ among themselves in the temperature of annealing and atmosphere prevailing in the furnace chamber, in the duration of a single work cycle and in the type and temperature of the coolant. These differences affect the magnitude of stresses occurring in each cycle of the operation of furnace accessories, and thus play an important role in fatigue processes leading to the destruction of these accessories. The kinetics of temperature changes during each cooling process plays an important role in the formation of thermal stresses on the cross-section of the cooled parts. It depends on many factors, including the initial cooling temperature, the type and temperature of the cooling medium, or the dimensions and shape of the object. This article presents a numerical analysis of the effect of the initial temperature on the distribution of stresses on the cross-section of the grate ribs, generated in the first few seconds of the cooling process carried out in two cooling media, i.e. hardening oil and water. The analysis was carried out by the finite element method, based on the results of experimental testes of temperature changes in the rib during its cooling.
Źródło:
Archives of Foundry Engineering; 2019, 3; 88-93
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of the Efficiency of Polish Foundries Using Data Envelopment Analysis
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/379915.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
benchmarking
data analysis
application of information technology
efficiency
przemysł odlewniczy
analiza danych
zastosowanie technologii informacyjnch
efektywność
Opis:
The article presents a study on the effectiveness of the foundries using Data Envelopment Analysis (DEA) method. The aim of the article is to analyze the usefulness of DEA method in the study of the relative efficiency of the foundries. DEA is a benchmarking technique based on linear programming to evaluate the effectiveness of the analyzed objects. The research was conducted in four Polish and two foreign plants. Evaluated foundries work in similar markets and have similar production technology. We created a DEA model with two inputs (fixed assets and employment) and one output (operating profit). The model was produced and solved using Microsoft Excel together with its Solver add-in. Moreover, we wrote a short VBA script to perform automating calculations. The results of our study include a benchmark and foundries’ ranking, and directions to improve the efficiency of inefficient units. Our research has shown that DEA can be a very valuable method for evaluating the efficiency of foundries.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 223-227
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Catalog and Semantic Search of Data in the Domain of Cast Iron Processing
Autorzy:
Rojek, G.
Regulski, K.
Wilk-Kołodziejczyk, D.
Kluska-Nawarecka, S.
Wawrzaszek, T.
Powiązania:
https://bibliotekanauki.pl/articles/381770.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technologies
foundry
semantic search
ontology
cast iron processing
zastosowanie technologii informacyjnych
odlewnictwo
obróbka żeliwa
Opis:
The aim of this study is to design and implement a computer system, which will allow the semantic cataloging and data retrieval in the field of cast iron processing. The intention is to let the system architecture allow for consideration of data on various processing techniques based on the information available or searched by a potential user. This is achieved by separating the system code from the knowledge of the processing operations or from the chemical composition of the material being processed. This is made possible by the creation and subsequent use of formal knowledge representation in the form of ontology. So, any use of the system is associated with the use of ontologies, either as an aid for the cataloging of new data, or as an indication of restrictions imposed on the data which draw user attention. The use of formal knowledge representation also allows consideration of semantic meaning, a consequence of which may be, for example, returning all elements in subclasses of the searched process class or material grade.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordinated Production Planning and Scheduling Problem in a Foundry
Autorzy:
Stawowy, A.
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/381726.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
application of information technology
production planning
scheduling
heuristics
przemysł odlewniczy
zastosowanie technologii informatycznych
planowanie produkcji
planowanie skoordynowane
Opis:
In the paper, we present a coordinated production planning and scheduling problem for three major shops in a typical alloy casting foundry, i.e. a melting shop, molding shop with automatic line and a core shop. The castings, prepared from different metal, have different weight and different number of cores. Although core preparation does not required as strict coordination with molding plan as metal preparation in furnaces, some cores may have limited shelf life, depending on the material used, or at least it is usually not the best organizational practice to prepare them long in advance. Core shop have limited capacity, so the cores for castings that require multiple cores should be prepared earlier. We present a mixed integer programming model for the coordinated production planning and scheduling problem of the shops. Then we propose a simple Lagrangian relaxation heuristic and evolutionary based heuristic to solve the coordinated problem. The applicability of the proposed solution in industrial practice is verified on large instances of the problem with the data simulating actual production parameters in one of the medium size foundry.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 133-138
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving Quality and Occupational Safety on Automated Casting Lines
Autorzy:
Kukla, S.
Powiązania:
https://bibliotekanauki.pl/articles/380123.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
quality management
automation in foundry
application of information technology
modelling of production systems
simulation of production systems
work ergonomics
przemysł odlewniczy
zarządzanie jakością
automatyzacja w odlewni
zastosowanie technologii informatycznych
modelowanie systemów produkcyjnych
symulacja systemów produkcyjnych
ergonomia pracy
Opis:
The paper presents a practical example of improving quality and occupational safety on automated casting lines. Working conditions on the line of box moulding with horizontal mould split were analysed due to low degree of automation at the stage of cores or filters installation as well as spheroidizing mortar dosing. A simulation analysis was carried out, which was related to the grounds of introducing an automatic mortar dispenser to the mould. To carry out the research, a simulation model of a line in universal Arena software for modelling and simulation of manufacturing systems by Rockwell Software Inc. was created. A simulation experiment was carried out on a model in order to determine basic parameters of the working system. Organization and working conditions in other sections of the line were also analysed, paying particular attention to quality, ergonomics and occupational safety. Ergonomics analysis was carried out on manual cores installation workplace and filters installation workplace, and changes to these workplaces were suggested in order to eliminate actions being unnecessary and onerous for employees.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 69-72
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the Casting Technology in the Bronze Age on the Basis of Investigations and Visualisation of Casting Moulds
Autorzy:
Garbacz-Klempka, A.
Kwak, Z.
Żak, P. L.
Szucki, M.
Ścibior, D.
Stolarczyk, T.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/381850.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technology
foundry industry
archaeometallurgy
casting moulds
bronze
XRF
zastosowanie technologii informatycznych
przemysł odlewniczy
archaeometalurgia
formy odlewnicze
brąz
Opis:
During excavation of the cremation cemetery of urnfield culture in Legnica at Spokojna Street (Lower Silesia, Poland), dated to 1100-700 BC, the largest - so far in Poland – a collection of casting moulds from the Bronze Age was discovered: three moulds for axes casting made out of stone and five moulds for casting sickles, razors, spearhead and chisels, made out of clay. This archaeological find constituted fittings of foundrymen’s graves. In order to perform the complete analysis of moulds in respect of their application in the Bronze Age casting technology analytical methods, as well as, computer aided methods of technological processes were used. Macroscopic investigations were performed and the X-ray fluorescence spectrometry method was used to analyse the chemical composition and metal elements content in mould cavities. Moulds were subjected to three-dimensional scanning and due to the reverse engineering the geometry of castings produced in these moulds were obtained. The gathered data was used to perform design and research works by means of the MAGMA5 software. Various variants of the pouring process and alloys solidification in these archaeological moulds were simulated. The obtained results were utilised in the interpretation of the Bronze Age casting production in stone and clay moulds, with regard to their quality and possibility of casting defects occurrence being the result of these moulds construction. The reverse engineering, modelling and computer simulation allowed the analysis of moulds and castings. Investigations of casting moulds together with their digitalisation and reconstruction of casting technology, confirm the high advancement degree of production processes in the Bronze Age.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 184-190
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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