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    Tytuł:
    Analysis of Al-Mg casting alloys crystallization with use of ATND method
    Analiza krystalizacji odlewniczych stopów Al-Mg metodą ATND
    Autorzy:
    Ciućka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175955.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting process
    process theory
    crystallization
    ATD analysis
    ATND method
    proces odlewania
    teoria procesu
    krystalizacja
    analiza ATD
    metoda ATND
    Opis:
    The paper presents results of non-ferrous metals crystallization tests performed with use of the ATND method. Method of analysis of non-ferrous metals crystallization gives complete picture of arisen structural components of alloys. Particular structural components of alloys investigated with use of the ATND method were verified in x-ray microanalysis, what unequivocally confirmed their presence. Below are presented in graphical form (crystallization diagrams) results of crystallization process obtained from the ATND method. In crystallization diagrams of AG 10 and AG51 alloys are shown curves (thermal curve and its derivative, voltage curve and its derivative). Crystallizable individual structural components of the investigated alloys are reflected on curves of the method in form of characteristic peaks. The tests were performed with AG 10 and AG51 aluminum-magnesium casting alloys. Moreover, the paper presents structures of the investigated alloys with marked structural components identified with use of x-ray microanalysis.
    W pracy przedstawiono analizę wyników badań metodą ATND procesu krystalizacji stopów metali nieżelaznych. Analiza procesu krystalizacji tych stopów umożliwia charakterystykę powstających składników fazowych ich mikrostruktury. Składniki fazowe mikrostruktury badanych stopów określone metodą ATND zweryfikowano metodą mikroanalizy rentgenowskiej. Przedstawiono krzywe krystalizacji stopów magnezu AG10 i AG51 w zależności od temperatury i czasu, określono efekty cieplne i napięciowe. Ustalone wartości temperatury i napięcia użyto w obliczeniach matematycznych, w analizie regresji w celu określenia wartości temperatury krystalizacji składników fazowych badanych stopów. Wykonano badania mikroskopowe stopów AG10 i AG51.
    Źródło:
    Advances in Manufacturing Science and Technology; 2013, 37, 1; 111-118
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simulation-based fuzzy analytic network process approach in developing sustainable manufacturing strategy
    Autorzy:
    Ocampo, L.
    Clark, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/407159.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    simulation
    analytic network process
    fuzzy set theory
    manufacturing strategy
    sustainability
    Opis:
    This paper adopts a probabilistic fuzzy analytic network process (PROFUZANP) approach in developing a sustainable manufacturing strategy. In this hybrid method, analytic network process handles the complexity of the problem structure under consideration, fuzzy set theory is used to describe vagueness in individual decision-making and probability theory is used to handle randomness in group decision-making. This holistic methodological approach addresses complexity and uncertainty both in individual and group decision-making which is useful in modeling group decisions such as developing a sustainable manufacturing strategy. In this work, an inclusive approach of integrating traditional manufacturing strategy concepts and sustainable manufacturing principles is proposed as a unifying decision model. The proposed decision structure adopts the hierarchical structure of manufacturing strategy and explores the presence of strategic responses and stakeholders’ interests as significant components of sustainability. Using PROFUZANP, the decision model identifies the content policies of sustainable manufacturing strategy. This content strategy is expected to address both competitiveness and sustainability of manufacturing firms. Results are reported in this paper along with insights and future work. The contribution of this work is the integration of manufacturing strategy and sustainability into a coherent decision framework that requires the use of PROFUZANP in dealing with complex and uncertain group decision-making problem.
    Źródło:
    Management and Production Engineering Review; 2015, 6, 2; 32-39
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stanisław Tabaczyński – pro memoria
    Autorzy:
    Marciniak, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2121554.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    archaeological theory
    archaeological process
    methodology
    Medieval archaeology
    the Annales school
    Sandomierz
    Opis:
    Stanisław Tabaczyński, a member of the Polish Academy of Sciences, passed away in November 2020. He was one of the most influential theoreticians of Stanisław Tabaczyński – pro memoria 183 archaeology in post-War Poland. He developed an original concept of the archaeo- logical process at the junction of the Annales school, the Poznań methodological school, and the inspirations from the Italian academic milieu cantered around the Polish-Italian Interdisciplinary Working Taskforce of Applied Sciences in Archaeology and Protection of Cultural Patrimony. Its main components com- prised long-term processes, ethnogenetic processes, and the polisemantisation of culture. He understood archaeology as the anthropology of the prehistoric past, outstretched between anthropology and history. He participated and ran numerous excavation projects in Poland and abroad. These comprised excavation campaigns carried out in the large-scale Millennium Research project in Poznań, Wrocław, Biskupin, Kołobrzeg, Grody Czerwieńskie and Nakło nad Notecią. His major achievement was the excavation of the early Medieval Sandomierz. He discovered a glassmaking workshop of the 7–8 th centuries on Torcello Island in the Venice Lagoon and participated in numerous field projects in Italy, France, and Algieria. He is the author of numerous books and articles. Among his most important publications are three-volume Theory and Practice of Archaeological Research, Przeszłość społeczna [The Social Past], Neolit środkowoeuropejski. Podstawy gospodarcze [Central European Neolithic. The economic foundations] and Archeologia średniowieczna – Problemy. Ź ródła, metody. Cele badawcze [Medieval Archaeology. Issues, Sources, Methods, and Research Objectives
    Źródło:
    Nauka; 2021, 3; 177-183
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Graphite Shape in Cast Iron Obtaining by Inmold Process
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381705.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    inmold process
    graphite shape
    teoria krystalizacji
    technologia inmold
    żeliwo sferoidalne
    Opis:
    The paper presents results of research on the effect of magnesium on the graphite shape in cast iron obtained by Inmold process. For testing Lamet® 5504 master alloy was used. The crystallization process of cast iron with various Mg concentrations was evaluated with use of the thermal and derivative analysis (TDA) method. The conditions were demonstrated for which a flake, vermicular and nodular graphite were obtained. Values of graphite “c” coefficient were analyzed. Results from it the significant differences between the assessment of the graphite on metallographic specimen and by the "c" coefficient. An effect of wall thickness of the casting on the graphite coefficient was indicated.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The humanities and cultural theory and practice in Ryszard Nycz’s “Culture as Verb”
    Humanistyka, teoria i praktyka kulturowa w ujęciu Ryszarda Nycza
    Autorzy:
    Łebkowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2089361.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cultural theory and practice
    the humanities
    the cultural process
    creativity
    Ryszard Nycz’s "Culture as Verb"
    humanistyka
    kultura
    kulturoznawstwo
    teoria
    praktyka kulturowa
    Opis:
    This article takes a look at Ryszard Nycz’s new, groundbreaking study of cultural theory, pointedly titled Culture as Verb. It focuses on the author’s two major claims which seem to provide a foundation for the whole project. One is a vigorous defence of the humanities, the other is the proposition that culture may be best understood as a verb. The latter provokes a number of questions, especially about the role of invention, a dominant factor in any action-oriented model of culture. For example, would invention control and drive the mechanism of semantic ordering and appropriation of the things that used to be nameless, ignored, or suppressed? Is that domination culturally determined, or merely conditioned? Is it a source of suffering? It would also be interesting to fi nd out more about the Nycz’s idea of transition from passive participation to the culture of active participation. The question is: Are we doomed to take part? As an aside, the author of this essay draws our attention to the darker side of being permanently involved in other people lives, the FOMO (Fear of Missing Out) anxiety, and a new narcissism.
    Źródło:
    Ruch Literacki; 2019, 4; 421-428
    0035-9602
    Pojawia się w:
    Ruch Literacki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermetallic Phases in Alloyed Cast Iron with 18%Si Addition
    Autorzy:
    Stawarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946866.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    solidification process
    intermetallic phases
    spheroidal graphite
    silicon cast iron
    teoria krystalizacji
    proces krzepnięcia
    fazy międzymetaliczne
    grafit sferoidalny
    żeliwo silikonowe
    Opis:
    The paper presents an analysis of a selected grade of high silicon cast iron intended for work in corrosive and abrasive conditions. The text describes its microstructure taking into account the process of crystallization, TDA analysis, EDS, XRD and the chemical composition analysis. In order to determine the phase composition, X-ray diffraction tests were carried out. The tests were executed on a Panalytical X'Pert PRO X-ray diffractometer with filtration of radiation from a lamp with copper anode and PIXcel 3D detector on the deflected beam axis. Completed tests allowed to describe the microstructure with detailed consideration of intermetallic phases present in the alloy. Results of the analysis of the examined alloy clearly show that we deal with intermetallic phases of Fe3Si, Fe5Si3 types, as well as silicon ferrite and crystals of silicon. In the examined alloy, we observed the phenomenon of segregation of carbon, which, as a result of this process, enriches the surface of silicon crystals, not creating a compound with it. Moreover, the paper demonstrates capability for crystallization of spheroidal graphite in the examined alloy despite lack of elements that contribute to balling in the charge materials.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 37-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meta-stable solidification created by the detonation method of coating formation
    Autorzy:
    Wołczyński, W.
    Garzeł, G.
    Morgiel, J.
    Senderowski, C.
    Pawłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382812.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krystalizacja
    krzepnięcie szybkie
    powłoka Fe-Al
    faza amorficzna
    theory of crystallization
    rapid solidification process
    Fe-Al coating
    meta-stable phase diagram
    amorphous phase
    Opis:
    Particles of the Fe-Al type (less than 50 m in diameter) were sprayed onto the 045 steel substrate by means of the detonation method. The TEM, SAED and EDX analyses revealed that the Fe-Al particles have been partially melted in the experiment of coating formation. Particle undergone melting even within about 80% of its volume. Therefore, solidification of the melted part of particles was expected. Solidification differed significantly due to a large range of chemical composition of applied particles (from 15 at.% Al up to 63 at.% Al). A single particle containing 63 at.% Al was subjected to the detailed analysis, only. The TEM / SAED techniques revealed in the solidified part of particle three sub-layers: an amorphous phase, [...] , periodically situated FeAl + Fe2Al5 phases, and a non-equilibrium phase, [...]. A hypothesis dealing with the inter-metallic phases formation in such a single particle of the nominal composition No = 0.63 is presented. At first, the solid / liquid system is treated as an interconnection: substrate / liquid / nonmelted particle part . Therefore, it is suggested that the solidification occurs simultaneously in two directions: towards a substrate and towards a non-melted part of particle. The solidification mechanism is referred to the Fe-Al meta-stable phase diagram. It is shown that the melted part of particle solidifies rapidly according to the phase diagram of meta-stable equilibrium and at a significant deviation from the thermodynamic equilibrium.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 93-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Designing of membrane contactors with cross-counter current flow
    Autorzy:
    Kołtuniewicz, A.B.
    Modelski, S.
    Witek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/952681.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane contactor
    sorption process
    integrated processes of separation
    designing
    surface renewal theory
    stycznik membranowy
    proces sorpcji
    zintegrowany proces separacji
    projektowanie
    teoria odnowienie powierzchni
    Opis:
    The knowledge about membrane contactors is growing rapidly but is still insufficient for a reliable designing. This paper presents a new type of membrane contactors that are integrated with one of the following ways of separation by using absorbents, micelles, flocculants, functionalized polymers, molecular imprints, or other methods that are based on aggregation. The article discusses methods for designing multi-stage cascade, usually counter-current. At every stage of this cascade, relevant aggregates are retained by the membrane, while the permeate passes freely through membrane. The process takes place in the membrane boundary layer with a local cross-flow of the permeate and the retentate. So the whole system can be called a cross-counter-current. The process kinetics “k” must be coordinated with the permeate flux “J” and the rate of surface renewal of the sorbent on the membrane surface, s. This can be done by using ordinary back-flushing or relevant hydrodynamic method of sweeping, such as: turbulences, shear stresses or lifting forces. A surface renewal model has been applied to adjust the optimal process conditions to sorbent kinetics. The experimental results confirmed the correctness of the model and its suitability for design of the new type of contactors.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 4; 573-583
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Queue Theory to Analysis and Evaluation of the Logistics Centre Workload
    Zastosowanie teorii kolejek do analizy i oceny obciążenia centrum logistycznego
    Autorzy:
    Żak, J.
    Jacyna-Gołda, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/223930.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    logistics centre
    mass service
    transportation process
    load analysis
    load rating
    queuing theory
    centrum logistyczne
    obsługa masowa
    proces transportowy
    analiza obciążenia
    ocena obciążenia
    teoria kolejek
    Opis:
    The article presents an application of queuing theory (mass service) to describe transportation process. It presents the essential concepts of the queuing theory. The process of moving a load unit through the logistics centre was presented. To illustrate the issues an example of five-level, two-input queuing networks was examined.
    W artykule przedstawiono zastosowanie teorii kolejek (masowej obsługi) do opisu procesu transportowego. W artykule zaprezentowano najistotniejsze pojęcia dotyczące teorii kolejek. Przedstawiono proces przemieszczania jednostki ładunkowej w centrum logistycznym. Dla zilustrowania zagadnienia przeanalizowano przykład dwuwejściowej, pięciostopniowej sieci kolejkowej.
    Źródło:
    Archives of Transport; 2013, 25-26, 1-2; 117-135
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grain Refinement of AlSi7Mg0,3 Alloy Cast by Rheocasting SEED
    Autorzy:
    Bryksí Stunová, B.
    Bryksí, V.
    Vitkova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382371.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    innovative foundry technologies
    innovative foundry materials
    solidification process
    metallography
    rheocasting
    teoria krystalizacji
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    proces krzepnięcia
    metalografia
    Opis:
    The paper concerns experimental work studying chemical composition, structures and selected mechanical properties of castings produced by rheocasting method SEED. After previous experiments, which showed inclusions in the primary phase α(Al) when observing structures, hypothesis of external nuclei was taken. The main goal of the work was to determine the influence of inoculation by various additions of titanium/boron based inoculant on the structure and properties of AlSi7Mg0,3 alloy. The master alloy AlTi5B1 was added in amounts of 0,05, 0,1, 0,15, 0,2 wt %. Metallographic observation by light and SEM microscopy was used for analysing the structures. Measurements of grain size were realised and evaluated. Brinell hardness measurements were performed. Chemical composition was measured by GDS analysis. Undertaken experiments did not prove the effect of inoculation of combined AlTi5B1 master alloy on castings made of AlSi7Mg0,3 alloy made by rheocasting SEED at given amounts and conditions.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 161-166
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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