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Wyświetlanie 1-15 z 930
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:
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:
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:
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
Tytuł:
Transformation of geodetic heights between local reference systems – algorithm for rigorous adjustment
Transformacja wysokości geodezyjnych pomiędzy lokalnymi układami odniesienia – algorytm wyrównania ścisłego
Autorzy:
Gargula, Tadeusz
Gawronek, Pelagia
Powiązania:
https://bibliotekanauki.pl/articles/2201682.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
1D transformation
post-transformation corrections
transformation weighting
transformacja 1D
korekty post-transformacyjne
wagowanie transformacji
Opis:
The topic of transformations between planar or spatial coordinate systems has been extensively addressed in the literature for years. Usually, researchers present in scientific papers the definitions of iterative algorithms or analytic solutions of 2D or 3D transformations. However, there is a gap in the field with regard to 1D (vertical) transformations. It seems to be quite easy to fill, as it is sufficient to determine one parameter – the vertical shift, i.e. the height difference between two local reference levels. For this purpose, a single (at least) adjustment point is needed, i.e. a surveying benchmark of known heights in both reference systems. However, there is no precisely defined model of rigorous adjustment for a larger number of adjustment points (s > 1). In this paper, the Authors’ have shown several variants of transformations between vertical coordinate systems. These variants include different approaches to weighting the “observations” (heights of adjustment points), such as transformation without weighting and transformation with weighting dependent on the distance between adjustment points (horizontal and vertical distances). Each of the variants was developed in two successive approaches: without transformation corrections and with post-transformation corrections. The research arrived at the latter analogically to the corrections used in planar coordinate transformations (a modification of post-transformation Hausbrandt correction). The analyses made it possible to draw general conclusions determining the relationships between weighting the observations together with applying post-transformation corrections, and the results of height transformation. These findings can become the basis for developers of geodetic computing systems, in terms of the possibility of extending them with a 1D transformation module (in addition to 2D and 3D transformations).
Zagadnienia transformacji pomiędzy układami współrzędnych płaskich bądź współrzędnych przestrzennych od lat znajdują swoje liczne opracowania w literaturze. Badacze w opracowaniach naukowych dokonują definicji zwykle nowych algorytmów iteracyjnych bądź analitycznych rozwiązań transformacji 2D lub 3D. W opracowaniach naukowych istnieje jednak luka naukowa, która dotyczy transformacji 1-wymiarowej (wysokościowej). Zadanie to wydaje się dość proste, ponieważ wystarczy wyznaczyć jeden parametr – przesunięcie pionowe, czyli różnicę wysokości pomiędzy dwoma lokalnymi poziomami odniesienia. W tym celu potrzebny jest jeden (minimalnie) punkt dostosowania, czyli reper o znanej wysokości w obydwu układach. Brakuje jednak jednoznacznie zdefiniowanego modelu wyrównania ścisłego w przypadku większej liczby punktów dostosowania (s > 1). W niniejszym artykule naukowym Autorzy zaprezentowali kilka wariantów transformacji pomiędzy układami współrzędnych wysokościowych. W wariantach tych zastosowano różne podejścia do kwestii wagowania „obserwacji” (wysokości punktów dostosowania), m.in. transformacja bez wagowania oraz transformacja z wagowaniem zależnym od odległości pomiędzy punktami dostosowania (odległości poziomych oraz odległości pionowych). Każdy z wariantów opracowano w dwóch kolejnych podejściach: bez korekt transformacyjnych oraz z korektami post-transformacyjnymi. Korekty post-transformacyjne opracowano analogicznie do korekt stosowanych w transformacji współrzędnych płaskich (modyfikacja korekty post-transformacyjnej Hausbrandta). Rezultaty przeprowadzonych analiz pozwoliły wysnuć wnioski ogólne, określające zależności pomiędzy wagowaniem obserwacji oraz stosowaniem korekt post-transformacyjnych a rezultatem transformacji wysokościowej. Wnioski z przeprowadzonych analiz mogą stać się podstawą dla twórców geodezyjnych systemów obliczeniowych, pod kątem możliwości ich rozszerzenia o moduł transformacji 1D (obok transformacji 2D i 3D).
Źródło:
Geomatics, Landmanagement and Landscape; 2022, 4; 123--135
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Key activities of digital transformation – comparative analysis of selected models
Autorzy:
Semrau, Jakub
Zaczyk, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/27313448.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
digital transformation
stages of digital transformation
digital transformation model
digital transformation tools
transformacja cyfrowa
etapy transformacji cyfrowej
model transformacji cyfrowej
narzędzia transformacji cyfrowej
Opis:
Purpose: Systematization of knowledge in the field of defining and occurrence of key activities that make up the overall concept of digital transformation with an indication of the key stages of its implementation. In addition, the aim of the article is also to conduct a comparative analysis of selected models of digital transformation in terms of a number of criteria, such as: the degree of concentration of the model on the selected sector of the economy, the degree of concentration on digital competences, the degree of focus on management concepts, the degree of concentration on digital transformation tools, the degree of focus on the digital maturity of the organization. Design/methodology/approach: The objectives of the article were achieved through an in-depth analysis of the literature on the subject in the field of models of digital transformation emphasizing the stages of its course. The article presents a comparative analysis of models selected in preliminary studies developed by consulting companies and models created as a result of research works by other scientists. Findings: The authors of the article compared the existing models of digital transformation and suggested the need to develop a new model using the partial advantages of the compared models. The authors also indicated a gap in the need to implement a component emphasizing the importance of managing resistance to changes in the organization. Originality/value: The originality of the article consists in drawing a conclusion in the form of a suggestion of the need to develop work in the field of modeling the digital transformation process in the context of the theory of organizational change, with particular emphasis on key competences, focus on methods and resistance to changes in an organization wishing to go through the digital transformation process.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2023, 168; 409--422
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decompositions of hypersurface singularities oftype $J_{k,0}$
Autorzy:
Jaworski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1311702.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
hypersurface singularity
j-invariant
underdiagonal deformation
shift transformation
quasihomogeneous transformation
Opis:
Applications of singularity theory give rise to many questions concerning deformations of singularities. Unfortunately, satisfactory answers are known only for simple singularities and partially for unimodal ones. The aim of this paper is to give some insight into decompositions of multi-modal singularities with unimodal leading part. We investigate the $J_{k,0}$ singularities which have modality k - 1 but the quasihomogeneous part of their normal form only depends on one modulus.
Źródło:
Annales Polonici Mathematici; 1994, 59, 2; 117-131
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feasible star – delta and delta – star transformations for reliability networks
Autorzy:
Prasad, V. C.
Powiązania:
https://bibliotekanauki.pl/articles/262801.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
star–delta transformation
delta–star transformation
series parallel reliability networks
Opis:
Consider the problem of transforming a star (delta) into an equivalent delta (star) in a reliability network with imperfect undirected edges and perfect vertices. It is believed that such transformations are not possible in general if the probabilities of the elements of the given star / delta are rational numbers. Contrary to this, it is shown here that star – delta and delta – star transformations are possible under certain conditions. Further the probability of success of an element of an equivalent star (delta) is shown to be equal to the probability of failure of the corresponding element of the given delta (star).
Źródło:
Electrical Power Quality and Utilisation. Journal; 2017, 20, 1; 1-5
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 930

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