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Wyświetlanie 1-15 z 144
Tytuł:
Transformation Kinetics of Austempered Ductile Iron: Dilatometric Experiments and Model Parameter Evaluation
Autorzy:
Suchocki, C.
Myszka, D.
Wasiluk, K.
Powiązania:
https://bibliotekanauki.pl/articles/356026.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ADI
transformation kinetics
diffusional transformation
model characteristics
Opis:
In this study a group of selected transformation kinetics equations is applied to describe the isothermal ferritic transformation in austempered ductile iron (ADI). A series of dilatometric tests has been carried out on ADI at different temperatures. The obtained experimental data are utilized to determine the parameter values of the considered kinetic equations. It is found that the transformation kinetics models by Starink, Austin and Rickett are substantially more effective at describing the ferritic transformation in ADI than the much celebrated Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. Furthermore, it is demonstrated that evaluating the kinetic parameters using the least squares method instead of calculating them from vastly used formulas can significantly improve the accuracy of the JMAK model’s predictions.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1661-1666
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prawidłowości transformacji w Europie Wschodniej
PATTERNS IN EAST EUROPEAN TRANSFORMATION
Autorzy:
Ekiert, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/427157.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
'PATH DEPENDENCY'
LEGACY OF COMMUNISM
SUCCESSFUL TRANSFORMATION
TRANSFORMATION
Opis:
Four factors seem to be decisive in determining the character and dynamics of transformation: the legacy of the past - the initial condition; the institutional choices; the degree of external assistance; policies of the new governments. In order to understand the East-European transformations and discover any patterns in these processes one must turn more attention to the legacy of the past and the initial condition i.e. follow a path dependency approach. No breakup with the past, even such radical as in East-Central Europe, can ever be complete. The past carries not only the elements dysfunctional for the new democratic and market order but also some which provide support for the changes. Among them one can list the negative experience with political crises, the attempts to reform the economy and liberalize the political system (even if not successful), the pragmatism of the communist elites, the emergence of the political and cultural opposition, the opening to the West. The 'path dependency' perspective, combines serious analysis of the historical experiences with the appreciation of singular events (such as for e.g. the first free elections) and their temporal sequence. It explains why some countries are successful in their transformation while others can't leave the circle of doom.
Źródło:
Studia Socjologiczne; 2011, 1(200); 501-526
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformation Diagrams of Selected Steel Grades with Consideration of Deformation Effect
Autorzy:
Kawulok, R.
Schindler, I.
Mizera, J.
Kawulok, P.
Rusz, S.
Opěla, P.
Podolínský, P.
Čmiel, K. M.
Mališ, M.
Powiązania:
https://bibliotekanauki.pl/articles/351710.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformation diagrams of steels
phase transformation
plastic deformation
dilatometric tests
Gleeble 3800
Opis:
The aim of this article was to assess the effect of previous plastic deformation on the transformation kinetics of selected steels with a wide range of chemical composition. Transformation (CCT and DCCT) diagrams were constructed on the basis of dilatometric tests on the plastometer Gleeble 3800 and metallographic analyses supplemented by measurements of HV hardness. Effect of previous deformation on transformation was evaluated of the critical rate of formation of the individual structural components (ferrite, pearlite and bainite) in the case of formation of martensite respect to Ms temperature. Previous plastic deformation accelerated especially diffuse transformations (ferrite and pearlite), temperature of Ms was lower after previous plastic deformation and bainitic transformation was highly dependent on the chemical composition of steel.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 55-60
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agrobacterium-mediated genetic transformation of Miscanthus sinensis and Miscanthus × giganteus. Preliminary studies
Autorzy:
Cerazy, J.
Slusarkiewicz-Jarzina, A.
Ponitka, A.
Malec, K.
Jezowski, S.
Pniewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/951241.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
Agrobacterium
genetic transformation
Miscanthus sinensis
biomass
renewable raw material
bioenergy
biofuel
plant transformation
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modified procedures in coercivity scaling
Autorzy:
Najgebauer, M.
Sokalski, K.
Szczygłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/141511.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coercivity
hyperbolic tangent transformation
scaling procedure
Opis:
The paper presents a scaling approach to the analysis of coercivity. The Widom-based procedure of coercivity scaling has been tested for non-oriented electrical steel. Due to insufficient results, the scaling procedure was improved relating to the method proposed by Van den Bossche. The modified procedure of coercivity scaling gave better results, in comparison to the original approach. The influence of particular parameters and a range of measurement data used in the estimations on the final effect of the coercivity scaling were discussed.
Źródło:
Archives of Electrical Engineering; 2015, 64, 3; 351-359
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology Control of One-Dimensional Gallium Nitride Nanostructures by Modulating the Crystallinity of Sacrificial Gallium Oxide Templates
Autorzy:
Ko, Yun Taek
Park, Mijeong
Park, Jingyeong
Moon, Jaeyun
Choa, Yong-Ho
Lee, Young-In
Powiązania:
https://bibliotekanauki.pl/articles/2049246.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GaN
nanofiber
nanotube
electrospinning
chemical transformation
Opis:
In this study, we demonstrated a method of controllably synthesizing one-dimensional nanostructures having a dense or a hollow structure using fibrous sacrificial templates with tunable crystallinity. The fibrous Ga2O3 templates were prepared by calcining the polymer/gallium precursor nanofiber synthesized by an electrospinning process, and their crystallinity was varied by controlling the calcination temperature from 500°C to 900°C. GaN nanostructures were transformed by nitriding the Ga2O3 nanofibers using NH3 gas. All of the transformed GaN nanostructures maintained a one-dimensional structure well and exhibited a diameter of about 50 nm, but their morphology was clearly distinguished according to the crystallinity of the templates. When the templates having a relatively low crystallinity were used, the transformed GaN showed a hollow nanostructure, and as the crystallinity increased, GaN was converted into a denser nanostructure. This morphological difference can be explained as being caused by the difference in the diffusion rate of Ga depending on the crystallinity of Ga2O3 during the conversion from Ga2O3 to GaN. It is expected that this technique will make possible the tubular nanostructure synthesis of nitride functional nanomaterials.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 709-712
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The CEE countries’ first decade of EU membership: from policy-takers towards agenda-setters?
Autorzy:
Schweiger, Christian
Powiązania:
https://bibliotekanauki.pl/articles/473244.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CEE countries
European Union
financial crisis
transformation
Opis:
The accession of the group of eight post-communist Central and Eastern European mem- ber states who joined in 2004 marked a historic watershed in the development of the European Union. The subsequent enlargements in 2004 represented the biggest expansion of the EU’s membership base since the beginning of the institutionalised process of insti- tutional European integration after the end of WW2. Even more importantly however, it constituted the official end of more than four decades in which the European continent had been artificially divided into two ideological and military blocs by the Cold War. This article concentrates on the 2004 enlargement and analyses how the CEE-8 group has integrated into the EU’s institutional and policy acquis over the past decade. In this respect the impact of the global financial crisis of 2008–09 represents a major challenge for the countries of the region in their ongoing political, economic and social transforma- tion since the fall of communism. The paper examines to what extent the CEE countries have managed to tackle the multiple challenges of the post-communist transition and which factors have determined their status as predominantly passive policy-takers. Special emphasis is put on the impact of the 2008–09 global financial crisis, which poses the risk of backsliding the CEE’s domestic political and economic transition process and growing alienation from the increasingly complex new coordinative EU policy mechanisms. The article also considers the potential future role of the semi-institutionalised cooperation amongst the Visegrád 4 group (Czech Republic, Hungary, Poland and Slovakia) in effec- tively promoting the interests of the wider CEE region in the EU. The main challenge in this respect lies in the persistent diversity of national interests and varying levels of com- mitment towards transnational cooperation amongst the V4 and the wider CEE group. This especially applies to the regional leader Poland, which has been torn between the ambition to intensify regional cooperation and the desire to become a leading player in the EU alongside France and Germany.
Źródło:
Problemy Polityki Społecznej. Studia i Dyskusje; 2015, 31(4); 99-118
1640-1808
Pojawia się w:
Problemy Polityki Społecznej. Studia i Dyskusje
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drivers and Barriers of Digital Transformation in Asset Management
Autorzy:
Maletič, Damjan
Grabowska, Marta
Maletič, Matjaž
Powiązania:
https://bibliotekanauki.pl/articles/2201183.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asset management
digital transformation
drivers
barriers
delphi
Opis:
This paper aims to improve understanding of the drivers and barriers to digital transformation in asset management. Accordingly, this paper contributes to the literature by conducting a qualitative Delphi study with 15 experts (including academia, consultancy and industry) to identify, validate, and classify the drivers and barriers affecting digital transformation in asset management. As a result of the experts’ interactions, 20 barriers were identified. The main barriers to digital transformation in asset management are the following: Misunderstanding of the strategic importance of asset management, no clear vision/strategy, existing mindset and culture, inadequate asset management system, lack of understanding of digital trends, and lack of employee knowledge and skills. The study also highlights 12 drivers that are critical to the digital transformation of asset management. These include cost reductions, opportunities in condition monitoring of assets, expected benefits in asset management processes, expected benefits in risk management and others.
Źródło:
Management and Production Engineering Review; 2023, 14, 1; 118--126
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scenariusze przekształceń struktury funkcjonalno-przestrzenne obszaru metropolitalnego trójmiasta
Transformation Scenarios of the Spatial and Functional Structure of Tri-City Metropolitan Area
Autorzy:
Lorens, P.
Powiązania:
https://bibliotekanauki.pl/articles/2031567.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
development scenarios
transformation conditions
Tri-City Metropolitan Area
Opis:
The article deals with the issue of spatial and functional transformation scenarios of the Tri-City Metropolitan Area in Poland. The staring point for these considerations is associated with analysis of the actual situation of the area as well as key development trends as well as conditions influencing these. In result, a number of possible scenarios were pointed out along with possible consequences of their realization. This allows reflection on the possible consequences of the chosen path of development as well as preconditions which have to be taken into account once the particular scenario is chosen. The article – although focused on Tri-City Metropolitan Area – also allows to lay foundations for discussion on possible development scenarios for other metropolitan areas in Poland as well as in other countries”.
Źródło:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2015, 259; 235-261
0079-3493
Pojawia się w:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Deformation and Austenitization Temperature on the Kinetics of Phase Transformations During Cooling of High-Carbon Steel
Autorzy:
Kawulok, P.
Podolinský, P.
Kajzar, P.
Schindler, I.
Kawulok, R.
Ševčák, V.
Opěla, P.
Powiązania:
https://bibliotekanauki.pl/articles/350975.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-carbon steel
cooling
transformation diagrams
microstructure
hardness
Opis:
The aim of the performed experiments was to determine the influence of deformation and of austenitization temperature on the kinetics of phase transformations during cooling of high-carbon steel (0.728 wt. % C). The CCT and DCCT diagrams for austenitization temperature 940°C and DCCT diagram for austenitization temperature 1000°C were constructed with the use of dilatometric tests. On the basis of obtained results, a featureless effect of austenitization temperature and deformation on the kinetics of phase transformations during cooling of investigated steel was observed. Critical cooling rates for the transformation of martensite in microstructure fluctuated from 5 to 7°C · s-1 (depending on the parameters of austenitization and deformation), but only at cooling rates higher than 8°C · s-1 a dominant share of martensite was observed in the investigated steel, which resulted in the significant increase of hardness.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1743-1748
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Glacial recession 2001-2006 and its landscape effects in the Lindströmfjellet-Hĺbergnuten mountain ridge, Nordenskiöld Land, Spitsbergen
Autorzy:
Ziaja, Wiesław
Pipała, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2051836.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
climate warming
glacial recession
landscape transformation
Źródło:
Polish Polar Research; 2007, 4; 237-247
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Landscape transformation under the Gåsbreen glacier recession since 1899, southwestern Spitsbergen
Autorzy:
Ostafin, Krzysztof
Ziaja, Wiesław
Dudek, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/2046825.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
climate warming
Glacier recession
Landscape transformation
Svalbard
Źródło:
Polish Polar Research; 2016, 37, 2; 155-172
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the One Channel Systems of a Delivery of Goods Provided by Unmanned Aerial Vehicles
Autorzy:
Kvyetnyy, Roman N.
Kulyk, Yaroslav A.
Knysh, Bogdan P.
Ivanov, Yuryy Yu.
Smolarz, Andrzej
Mamyrbaev, Orken
Burlibayev, Aimurat
Powiązania:
https://bibliotekanauki.pl/articles/226728.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
signal processing
window transformation
multi-window spectrum estimation
Opis:
In this article is revealed the systems of a good delivery witch implement unmanned aerial vehicles during providing the service. the one channel systems of a goods delivery are a goal of this research work. the close analysing of their functional features, the classification, the types and parameters of different systems from this band are presented. in addition, the modelling of the different types of the one channel systems of goods delivery are has done.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 487-492
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel Within the Heat Treatment Temperature Range
Autorzy:
Kargul, T.
Powiązania:
https://bibliotekanauki.pl/articles/351831.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal analysis
DSC
solid phase transformation
hypoeutectoid steel
Opis:
The paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments: Ac1s, Ac1f – temperatures of the beginning and finish of the eutectoid transformation, Ac2 – Curie temperature of the ferrite magnetic transformation and the temperature Ac3 of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 891-897
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Chromium Addition on Physical Properties of Cu-Al Based High Temperature Shape Memory Alloy
Autorzy:
Deniz Çirak, Z.
Kök, M.
Aydoğdu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/356477.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-Al based
shape memory alloy
transformation
phase
Opis:
Cu-Al-based high temperature shape memory alloys are preferred commonly due to their cheap costs and shape memory properties. In recent years, studies have been conducted on developing and producing a new type of Cu-Al based shape memory alloy. In this study, the CuAl-Cr alloy system, which has never been produced before, is investigated. After production, the SEMEDX measurements were made in order to determine the phases in the Cu84–x Al12Crx+4(x = 0, 4, 6) (weight %) alloy system; and precipitate phases together with martensite phases were detected in the alloys. The confirmations of these phases were made via x-ray measurements. The same phases were observed by XRD diffractogram of the alloys as well. The values of transformation temperature of alloys were determined with Differential Scanning Calorimetry (DSC) at 20°C/min heating rate. According to the DSC results, the transformation temperature of the alloys varies between 320°C and 350°C. This reveals that the alloys show high temperature shape memory characteristics.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1595-1598
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 144

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