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Wyszukujesz frazę "marek, Jaroslav" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Mathematical modeling of the stress-strain state of the annular preventer seal using the theory of reinforced shells
    Autorzy:
    Grydzhuk, Jaroslav
    Chudyk, Ihor
    Slabyi, Orest
    Mosora, Yurii
    Kovbaniuk, Mariana
    Krynke, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/26073542.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    pierścieniowy zawór odcinający
    wzmocniona powłoka
    kombinowana uszczelka gumowo-metalowa
    stan naprężenia-odkształcenia
    annular preventer
    reinforced shell
    combined rubber-metal seal
    stress-strain conditions
    Opis:
    Management of wells in the process of their construction is one of the important factors in ensuring the safety of the technological process. Blowout equipment, which includes annular preventers, is used to control the wells. This applies to the construction of oil and gas wells, or wells that provide degassing of coal seams to reduce their gas-dynamic activity. For the purpose of safe and long-term operation of annular preventers on the basis of the theory of thick-walled combined reinforced shells and the carried-out analytical research, the mathematical model for research of a stress-strain condition of a seal of an annular preventer has been offered. Taking into consideration the real design, the seal of the annular preventer is modeled by a rubber shell, reinforced in the circular direction by rubber frames, and in the longitudinal direction by metal stringers. The mathematical model provides for determining the stiffness, internal force factors and stresses in the longitudinal and transverse sections of the combined rubber-metal seal, considering the peculiarities of its operation. At the same time, the model includes the conditions of interaction of the rubber base of the seal with a pipe, as well as the action of sealing pressure under operating conditions. The use of the proposed mathematical model reduces the costs of experimental research and will contribute to ensuring the reliability of simulation modeling results. The advantage of the method is the determination of calculated loads at different points of the combined seal under the existing state of dangerous zones and the influence of operating conditions. In the meantime, prerequisites have been created for expanding the possibilities of simulation modeling and designing structural elements of annular preventers with increased operational characteristics. The practical value of the obtained results is determined by the possibility of using them to ensure the performance of the rubber-metal seal both at the stage of its design and during the operation.
    Źródło:
    Production Engineering Archives; 2022, 28, 4; 375--380
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Korespondencja Feliksa Konecznego z Jaroslavem Bidlo
    The Exchange of Letters between Felix Koneczny and Jaroslav Bidlo
    Autorzy:
    Biliński, Piotr
    Ďurčanský, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/571072.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Jagielloński. Biblioteka Jagiellońska
    Tematy:
    historia historiografii
    naukowe stosunki polsko-czeskie
    the history of historiography
    Polish-Bohemian scholarly exchanges
    Opis:
    W niniejszej edycji zamieszczono listy polskiego historyka Feliksa Konecznego i jego czeskiego kolegi Jaroslava Bidlo z lat 1896–1935 (30 listów). Korespondencja dotyczy przede wszystkim spraw naukowych związanych z zainteresowaniami badawczymi obu uczonych. Ponadto przewijają się tematy dotyczące politycznych i kulturalnych stosunków polsko-czeskich. Znajomość pomiędzy uczonymi została zawarta jeszcze w XIX wieku, podczas studiów Bidla na Uniwersytecie Jagiellońskim. Listy są przechowywane w Bibliotece Narodowej w Warszawie oraz w Instytucie Masaryka – Archiwum Akademii Nauk Republiki Czeskiej w Pradze.
    The present publication contains an exchange of thirty letters between the Polish historian Feliks Koneczny and his Czech friend Jaroslav Bidlo written in the period 1896–1935. Their correspondence primarily concerns issues connected with the research interests of both scholars. It also touches on the subject of Polish-Bohemian political and cultural relations. Their acquaintance dated back to the nineteenth century, when Bidlo studied at the Jagiellonian University. The letters are held by the National Library in Warsaw and the Masaryk Institute at the Archive of the Academy of Sciences of the Czech Republic in Prague.
    Źródło:
    Biuletyn Biblioteki Jagiellońskiej; 2016, 66; 45-68
    0006-3940
    2450-0410
    Pojawia się w:
    Biuletyn Biblioteki Jagiellońskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jaroslav Bidlo and Milada Paulová: On the Institutionalisation of Czech Historical Slavonic Studies in the First Half of the Twentieth Century
    Autorzy:
    Ďurčanský, Marek
    Brádlerová, Daniela
    Powiązania:
    https://bibliotekanauki.pl/articles/2177388.pdf
    Data publikacji:
    2022-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    historiography
    Central and Eastern Europe
    historical Slavonic studies
    history of science
    Jaroslav Bidlo
    Milada Paulová
    history of university education
    historiografie
    Středovýchodní Evropa
    historická slavistika
    dějiny univerzitní vzdělanosti
    dějiny vědy
    Opis:
    This study follows the academic careers of Jaroslav Bidlo and Milada Paulová, focusing on their organisational activities in the realm of historical Slavonic studies. Both were professors of general history, specialising in the history of Eastern Europe and the Balkan Peninsula at the Faculty of Philosophy (Charles University, Prague). Their names are thus tied to the development of Czech historical Slavonic studies since their beginnings in late 19th and early 20thcenturies until the 1960s.
    Źródło:
    Historia Slavorum Occidentis; 2022, 4(35); 196-228
    2084-1213
    Pojawia się w:
    Historia Slavorum Occidentis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decision tree based model of business failure prediction for Polish companies
    Autorzy:
    Durica, Marek
    Frnda, Jaroslav
    Svabova, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/19090954.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    decision trees
    prediction model
    financial ratios
    business failure
    Polish companies
    Opis:
    Research background: The issue of predicting the financial situation of companies is a relatively young field of economic research. Its origin dates back to the 30's of the 20th century, but constant research in this area proves the currentness of this topic even today. The issue of predicting the financial situation of a company is up to date not only for the company itself, but also for all stakeholders. Purpose of the article: The main purpose of this study is to create new prediction models by using the method of decision trees, in achieving sufficient prediction power of the generated model with a large database of real data on Polish companies obtained from the Amadeus database. Methods: As a result of the development of artificial intelligence, new methods for predicting financial failure of the company have been introduced into financial prediction analysis. One of the most widely used data mining techniques in this field is the method of decision trees. In the paper, we applied the CART and CHAID approach to create a model of predicting the financial difficulties of Polish companies. Findings & Value added: For the creation of the prediction model, a total of 37 financial and economic indicators of Polish companies were used. The resulting decision trees based prediction models for Polish companies reach a prediction power of more than 98%. The success of the classification for non-prosperous companies is more than 83%. The created decision tree-based prediction models are useful mainly for predicting the financial difficulties of Polish companies, but can also be used for companies in another country.
    Źródło:
    Oeconomia Copernicana; 2019, 10, 3; 453-469
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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