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Wyświetlanie 1-10 z 2567
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:
A semi-theoretical model for transformation plasticity occurred during bainitic transformation
Autorzy:
Yaakoubi, M.
Dammak, F.
Powiązania:
https://bibliotekanauki.pl/articles/280553.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
bainitic transformation
transformation induced plasticity (TRIP)
traction loading
Opis:
This study addresses the task of predicting the transformation plasticity induced during pha- se transformation of the 16MND5 carbon steel from austenite to bainite under low externally applied stress using a semi-theoretical model based on the Greenwood-Johnson mechanism. Both models proposed by Leblond et al. (1989) and Taleb and Sidoroff (2003) sufficiently describe the evolution of the TRansformation Induced Plasticity (TRIP) during continuous cooling of the austenitic phase. Nevertheless, TRIP values predicted by these models unde- restimate measured data through the first half of the transformation and overestimate them through the second half. So, we propose in this paper a method to improve Taleb’s model in order to remove discrepancies between theoretical and experimental results throughout the whole transformation and obtain a better description of experimental data.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 141-153
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
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:
Projective and Affine Transformations in the Modification of RSA Algorithm for Detached Classes of Images
Autorzy:
Rashkevych, Y. Y.
Peleshko, D. D.
Kovalchuk, A. M.
Szymanski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/108658.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
RSA algorithm
encryption, decryption
affine transformation
projective transformation
Opis:
Based on the RSA algorithm, as the most common industrial standard of data encryption, modifications with projective and affine transformations for encryption of images that allow to strictly allocate outlines are proposed.
Źródło:
Journal of Applied Computer Science Methods; 2011, 3 No. 1; 67-75
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Evaluation of Gear Ring Behavior During Various Cooling Conditions
Autorzy:
Perzyński, K.
Madej, Ł.
Szajding, A.
Raga, K.
Kubiak, K.
Niechajowicz, A.
Jaskiewicz, K.
Gronostajski, Z.
Pietrzyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/99546.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
bainitic transformation
martensitic transformation
finite element analysis
APDL
Opis:
The phase transformation model incorporated via the user subroutines to the commercial finite element software to accurately predict changes occurring during cooling of metallic components is presented in the paper. The cooling process of steel rings used in airplanes was selected as a case study. Particular attention was put on heterogeneities occurring in temperature field, which influence phase transformations and eventually residual stresses. Developed model was used in the present work to evaluate influence of different cooling conditions on ring behaviour.
Źródło:
Journal of Machine Engineering; 2016, 16, 2; 18-26
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terms of reforming the Polish educational system in political transformation period
Autorzy:
Szczesna, J.
Rodzos, J.
Powiązania:
https://bibliotekanauki.pl/articles/2084597.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Polska
educational strategy
political transformation
reform
transformation period
Opis:
The turn of the 80. and 90. of the XX century was a period of great political, economic and social changes in Poland. Introduction of democratic principles and Poland joining in the processes of European integration required a quick adaptation of the educational model to the changing social and economic conditions. In the new reality of the state's functioning the educational model based on central management became inadequate because it was applying uniform patterns of education characteristic for the communist era. The range of student's competence in the course of education was considered insufficient. In the era of market economy and general access to information the educational model based on encyclopedic knowledge also became inadequate. The required features which needed to be developed in a future citizen were: openness, creativity, initiative, the ability to function in conditions of competitiveness (Rodzoś, Charzyński 2005). It was particularly significant to prepare the young generation essentially for the proper reception and interpretation of the social and economic processes and changes occurring in the surrounding world. All of the above mentioned reasons lead to passing a bill on a new educational system by the Seym of Poland in 1990 and beginning the process of reforms. However, carrying out the reforms in conditions of the state's difficult financial situation as well as in the context of social habits formed during the 45 years of functioning in the totalitarian system causes numerous problems and inconsistency. The basic ones are: lack of cohesion of educational policy and frequent changes of the concept of reform resulting not from aspiration to increase the effectiveness of education, but from political and economic rationale; discrepancy between the theory of reform and its practical realization; appearance of activities and too hasty introduction of some changes, and lack of mental preparation of the society. These problems defer the process of reform and aggravate gaining positive results in the form of society's education which is better and well adapted to the needs of the contemporary world; they led as well to a decrease in prestige of the profession of a teacher. Despite the difficulties, many positive changes have also been obtained in the polish educational system, i.e. making education non-political, increase of the society's general level of education, implementation of the concept of life-long learning as well as introduction of many educational patterns copied from countries with well developed democratic systems, especially in the European Union.
Źródło:
Prace i Studia Geograficzne; 2011, 48; 15-26
0208-4589
Pojawia się w:
Prace i Studia Geograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie architektury korporacyjnej do koordynacji cyfrowej transformacji w sieciach organizacji
The Use of Enterprise Architecture to Coordinate the Digital Transformation of Organization Networks
Autorzy:
Sobczak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/525707.pdf
Data publikacji:
2015-02-02
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
organization network
digital transformation
enterprise architecture
organization transformation
Opis:
Efektywne wdrażanie cyfrowej transformacji zaczyna mieć kluczowe znaczenie dla firm z coraz większej liczby sektorów. W artykule przedstawiono koncepcję wykorzystania architektury korporacyjnej do koordynacji takiego przedsięwzięcia dla sieci organizacji. Omówiono strukturę autorskiego modelu oraz wskazano na kierunki dalszych prac nad tą koncepcją.
Effective implementation of the digital transformation is becoming crucial for companies in a growing number of sectors. In this article the author describes the concept of using enterprise architecture to coordinate such an initiative for organization networks. The structure of the author’s model has been presented and future directions to improve it have been outlined. Keywords: organization network, digital transformation, enterprise architecture, organization transformation.
Źródło:
Problemy Zarządzania; 2015, 2/2015 (52), t.1; 113-124
1644-9584
Pojawia się w:
Problemy Zarządzania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Empirical AI Transformation Research: A Systematic Mapping Study and Future Agenda
Autorzy:
Peretz-Andersson, Einav
Torkar, Richard
Powiązania:
https://bibliotekanauki.pl/articles/2079604.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
AI transformation
digital transformation
organizational change
systematic mapping study
Opis:
Background: Intelligent software is a significant societal change agent. Recent research indicates that organizations must change to reap the full benefits of AI. We refer to this change as AI transformation (AIT). The key challenge is to determine how to change and which are the consequences of increased AI use. Aim: The aim of this study is to aggregate the body of knowledge on AIT research. Method: We perform an systematic mapping study (SMS) and follow Kitchenham’s procedure. We identify 52 studies from Scopus, IEEE, and Science Direct (2010–2020). We use the Mixed-Methods Appraisal Tool (MMAT) to critically assess empirical work. Results Work on AIT is mainly qualitative and originates from various disciplines. We are unable to identify any useful definition of AIT. To our knowledge, this is the first SMS that focuses on empirical AIT research. Only a few empirical studies were found in the sample we identified. Conclusions We define AIT and propose a research agenda. Despite the popularity and attention related to AI and its effects on organizations, our study reveals that a significant amount of publications on the topic lack proper methodology or empirical data.
Źródło:
e-Informatica Software Engineering Journal; 2022, 16, 1; art. no. 220108
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-precision bearing estimation for active sonar with cylindrical array, performed by interpolated array transformation
Autorzy:
Leśniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/332709.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
interpolated array transformation
Opis:
The article presents a method for improving the accuracy of bearing in multibeam sonar with a cylindrical array. The antenna’s non-linearshape and the resulting non-uniform sampling of the signal in space, mean that known methods of high-resolution spectral analysis cannot be used. In order to apply an algorithm from this group, a linear virtual antenna must be produced. The paper presents a technique of mapping a cylindrical array to the equivalent linear form. The simulation results present the accuracy of bearing estimation in the presence of white noise. Furthermore, the limitations of the method and practical aspects of the application in a real sonar system are discussed.
Źródło:
Hydroacoustics; 2016, 19; 265-276
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 2567

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