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Wyświetlanie 1-15 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
Tytuł:
'Illusory Corporatism' Ten Years Later
Autorzy:
Ost, David
Powiązania:
https://bibliotekanauki.pl/articles/942472.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
neoliberalism
tripartism
transformation
Opis:
Ten years after the publication of 'Illusory Corporatism in Eastern Europe', the author re-examines his claim that tripartite arrangements introduced in the region after 1989 served chiefly as a façade for introducing neoliberal policies undermining labour interests. He finds that tripartism still produces meagre results, and that most of what labour has gained has come from better organisation, smarter use of resources, and increased militancy, not from tripartism. While 'illusory corporatism' is sustained in Eastern Europe, it is advancing elsewhere in the world. He looks at Latin America and Asia, which resemble 1990s Eastern Europe, as governments introduce tripartism at crisis moments in order to win labour commitments to cutbacks. As for Western Europe, where many scholars have seen an advancement of corporatism because of the signing of pacts in countries where the traditional preconditions were lacking, the author argues that this corporatism is 'illusory' because pacts are made to secure labour's acceptance to the corrosion of union power and a decline in labour conditions. Standards of corporatism have been systematically ratcheted down. Many scholars see 'corporatism' wherever agreements are signed, whereas an outcome-based approach, proposed by the author in his original article, leads to a characterization of 'illusory corporatism'.
Źródło:
Warsaw Forum of Economic Sociology; 2011, 2, 3; 19-49
2081-9633
Pojawia się w:
Warsaw Forum of Economic Sociology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A case study, Bagnoli: a difficult transition
Autorzy:
Selvaggio, Maria Antonietta
Powiązania:
https://bibliotekanauki.pl/articles/1036427.pdf
Data publikacji:
2015
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
transformation
identity
participation
Opis:
Bagnoli, a neighbourhood on the west outskirts of Naples, has been a typical industrial and working class area for more than eighty years, having put up an important factory district in a wide territory belonging to its seaside zone, where the Ilva-Italsider building, third steel industry centre in Italy, dominated. Since 1993 this huge factory has been definitely closed and its facilities have been phased out. So the large territory has become object of an important conversion and urban requalification project. Between 1995, when the variant Regulation Plan of Naples Municipality was introduced, and 2005, when the Executive Urban Plan was approved, this project has been developing and completing, defining the future of the ex industrial area, according some privileged lines: enhancement of natural and landscape aspects inside the heart of Pozzuoli gulf; recovery and development of the original touristic vocation through the thermal system and bathing restoration. This project opens towards great expectations of transformation and improvement of life and environment quality both for the inhabitants who live there in the neighbourhood and for the whole city. At the same time it has happened a speculation phenomenon through the sale contract concerning buildings and flats by the realties, together with the transfer of many historical inhabitants and the arrival of new people in the neighbourhood. They are attracted by the changing prospective of the area, but they have no relation with the zone and its history. So, during the last twenty years, the neighbourhood identity has been modified. Contemporarily, the soils draining proceeds slowly and among thousands difficulties, while the sea bottom draining isn’t active yet. Today, most of the area is under seizure by judiciary, that found irregularities and defaults in the draining works, realized only for the 65%. The future imagined in the conversion project results, in this way, largely compromised. In this research work we intend to verify how a particular physical-spatial dimension has influenced the social relations and the same identities of the people and their “community”, how we can delineate the perception and the performance of a urban transformation largely failed, and which contribution the citizens of Bagnoli can give to the urban design through their own imaginary and meanings they ascribe to their environment (Lynch 1960). In this sense, the study aim at giving a contribution to the participative practice, that up to now is out of the transition dynamics.
Źródło:
Academicus International Scientific Journal; 2015, 11; 40-50
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy kapitalizm może być etyczny?
Can the Polish Capitalism Be Ethical?
Autorzy:
Kowalik, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/964252.pdf
Data publikacji:
2008-05-15
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Polska
capitalism
transformation
Opis:
It is the individualistic approach which prevails in previous analysis of the problem of ethics in economy. The problem of the ethical attitude concerns individuals, business people, managers, politicians and economists. The publications about business ethics lack analysis of system circumstances in which individuals and companies act. If capitalism is just the power of capital owners over workers and if, according to Schumpeter, it is “the civilization of inequality and of the family fortune”, than it can be easily judged as a system of predominantly unethical tendencies. Nevertheless, it is worth raising questions about ethical character of various types of capitalism. Participation capitalism is one which ensures (nearly) full employment, a social minimum wage for everyone and the real power of society including workers’ participation in decision processes. The structural conditions of such capitalism force and even encourage ethical behaviour. The capitalism of the protective state was founded by J.M. Keynes, W. Beveridge and Will Hutton with his stakeholder capitalism. Many European countries approach this standard of capitalism. Predacious capitalism (turbo-capitalism) is a maximum-profit-oriented capitalism with no regard to social costs. The nearest example is the post-Reagan American capitalism. Polish capitalism fails to pass muster even in regard to the liberal capitalism.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2008, 11, 1
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przemiany par
Transformation of steams
Autorzy:
Litke, Benedykt Julian
Powiązania:
https://bibliotekanauki.pl/articles/136008.pdf
Data publikacji:
2018
Wydawca:
Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie
Tematy:
pary
przemiana izochoryczna
przemiana izobaryczna
przemiana izotermiczna
przemiana izentropowa
zapis analityczny
steams
isochoric transformation
isobaric transformation
isothermal transformation
isentropic transformation
analytical description
Opis:
Wstęp i cele: W pracy opisano przemiany par, a w szczególności przemianę izochoryczną, izobaryczną, izotermiczną oraz izentropową. Głównym celem pracy jest opisanie wzorów analitycznych przedstawiających przemiany gazów. Materiał i metody: Materiał stanowią źródła z literatury z zakresu termodynamiki. W pracy zastosowano metodę analizy teoretycznej. Wyniki: Rezultatem pracy jest przedstawienie wzorów analitycznych przedstawiających przemianę izochoryczną, izobaryczną, izotermiczną oraz izentropową. Ponadto w pracy opracowano graficznie obszar pary wodnej na wykresie granicznym o współrzędnych temperatura - entropia oraz entalpia spoczynkowa - entropia. Wnioski: Kiedy przemiana rozpoczyna się w obszarze par przegrzanej a kończy w obszarze pary nasyconej mokrej, jej właściwości w tej części przemiany zależą od stopnia suchości. W przemianach izochorycznych objętość lub objętość właściwa jest stała. W przemianie izobarycznej ciśnienie jest stałe. Temperatura w przemianie izotermicznej jest stała i w obszarze pary mokrej jest równocześnie temperaturą nasycenia.
Introduction and aim: The paper describes the transformation of steams, in particular case isochoric, isobaric, isothermal and isentropic transformation. The main aim of the paper is to describe analytical formulas showing steams conversions. Material and methods: Material covers some sources based on the literature in the field of thermodynamics. The method of theoretical analysis has been shown in the paper. Results: The result of the work is to present analytical models representing isochoric, isobaric, isothermal and isentropic transformation. In addition, in the paper a graphically developed area of water vapor on the boundary graph with the coordinates temperature - entropy and rest enthalpy - entropy. Conclusions: When the transformation begins in the area of superheated steam and ends in the area of wet saturated steam, its properties in this part of the transformation depend on the degree of dryness. In isochoric changes, the volume or specific volume is constant. In the isobaric transformation, the pressure is constant. The temperature in the isothermal transformation is constant and in the area of the wet steam is simultaneously the saturation temperature.
Źródło:
Problemy Nauk Stosowanych; 2018, 9; 51-60
2300-6110
Pojawia się w:
Problemy Nauk Stosowanych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business ethics and social responsibility in the transition economies
Autorzy:
Chrzanowski, Ignacy
Powiązania:
https://bibliotekanauki.pl/articles/916184.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
transformation
business ethics
Opis:
The issue of business ethics and corporate social responsibility continues to be widely discussed in the world literature, and is still actual because of the emerging scandals related to the large corporation’s activities. According to the author, in the Central and Eastern Europe post-communist countries one finds examples of almost all aspects of unethical behavior and practices, and which still require from the business, state administration at different levels, and society appropriate actions. The article includes a retrospective analysis of this phenomenon.
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2014, 32, 3; 27-37
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2567

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