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    Wyświetlanie 1-13 z 13
    Tytuł:
    The Phenomenon of Hydrogen Embrittlement in High-Strength Bolts
    Autorzy:
    Dubiel, Tomasz
    Balawender, Tadeusz
    Osetek, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2203713.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold forging
    hydrogen embrittlement
    high-strength bolts
    Opis:
    The hydrogen embrittlement of metals is caused by the penetration and accumulation of hydrogen atoms inside the metal. The failure of the product due to hydrogen embrittlement is delayed in time and does not occur immediately after its manufacture, but several hours, days, or even weeks later. Therefore, the chances of detecting hydrogen embrittlement when checking the quality of the finished product are very slim. The use of high-strength bolts in industry is associated with the risk of hydrogen embrittlement. This phenomenon poses a threat to the safe use of devices by limiting or completely losing the functionality of the bolt joint. Even a low influence of moisture can trigger failure mechanisms. The article proposes a method for assessing the risk of hydrogen embrittlement for high-strength bolts in class12.9. For this purpose, bolts made of material grade 32CrB4 were prepared and in a controlled manner the grain flow inconsistency was made, leading in extreme cases to the production of the forging lap. To perform the study, the device proposed by the European Assessment Document (EAD) was adapted to the testing of hydrogen embrittlement of threaded fasteners in concrete. The concrete substrate was replaced with metal spacers that were preloaded with a bolt. The use of the wedge distance under the bolt head led to the generation of two stress states - tensile and compressive, which translated into an increased risk of hydrogen embrittlement. After being tested, the bolts were visually and microscopically inspected to assess potential locations for cracks and hydrogen propagation. As a result of the conducted tests, it was found that the prepared test method allows to assess the resistance or susceptibility of the bolt to threats related to hydrogen embrittlement.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 395--402
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Fibrous Structure of the Bolt and Its Effect on the Joint Reliability
    Autorzy:
    Dubiel, Tomasz
    Balawender, Tadeusz
    Osetek, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2049126.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold forging
    bolts
    fasteners
    grain flow pattern
    Opis:
    The use of cold forging is a widely used solution in many industries. One application is the manufacture of bolts and fasteners. The largest amounts of bolts are used in the automotive and machine industry. Those customers demand high standards of quality and reliability from producers based on ISO 9001 and IATF 16949. Also, the construction, agriculture and furniture industries are raising their expectations for deliveries from year to year. Automotive companies issue their standards specifying specific requirements for products. One of these standards is the aviation standard SAE USCAR 8-4; 2019, which speaks of a compatible arrangement of fibers in the bolt head and in the area of transition into the mandrel. The article presents the cold forging process of flange bolts. Obtaining a compatible, acceptable and incompatible grain flow pattern based of the above mantioned standard was presented. Then the results of FEM simulation were correlated with the performed experiment. The effect of incompatible grain flow system was discussed and presented as the crack initiating factor due to delta ferrite, hydrogen embrittlement, tempering embrittlement. The reliability of the connections was confirmed in the assembly test for yield stress on a schatz machine. The advantages of this method and the difference compared to the tensile test were presented.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1075-1085
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Dynamics in a Bertrand Duopoly Game with Heterogeneous Players
    Autorzy:
    Dubiel-Teleszyński, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/483303.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bertrand duopoly
    heterogeneous expectations
    nonlinear dynamics
    chaos
    Opis:
    A heterogeneous Bertrand duopoly game with bounded rational and adaptive players manufacturing differentiated products is subject of investigation. The main goal is to demonstrate that participation of one bounded rational player in the game suffices to destabilize the duopoly. The game is modelled with a system of two difference equations. Evolution of prices over time is obtained by iteration of a two dimensional nonlinear map. Equilibria are found and local stability properties thereof are analyzed. Complex behavior of the system is examined by means of numerical simulations. Region of stability of the Nash equilibrium is demonstrated in the plane of the speeds of adjustment. Period doubling route to chaos is presented on the bifurcation diagrams and on the largest Lyapunov characteristic exponent graph. Lyapunov time is calculated. Chaotic attractors are depicted and their fractal dimensions are computed. Sensitive dependence on initial conditions is evidenced.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2010, 2, 2; 95-116
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metahydrophobicity and orthohydrophilicity tested in flotation of NaCl, KCl, KPF6 in their saturated aqueous solutions
    Autorzy:
    Drzymala, Jan
    Dubiel, Malgorzata
    Ratajczak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/109910.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    contact angle
    hydrophobicity
    hydrophilicity
    Opis:
    Flotation tests of different size fractions of NaCl, KCl and KPF6 in their saturated aqueous solutions were performed in a 36 cm in height monobubble Hallimond tube. Also contact angle tests by means of sessile drops of saturated salt solution put on pressed discs of salts were carried out. The obtained sessile drop contact angles were equal to zero, pointing to a complete hydrophilicity (orthophilicity) of the investigated salts. In the case of NaCl and KCl, their orthohydrophilicity was confirmed by flotation tests and flotometric considerations because the entrainment factors, which take into account the maximum size of entrained particles and density of the salt as well as it solution, were similar to those of quartz and magnetite and equal to 0.11 mm. The entrainment factor for KPF6  was equal to 0.18 mm and was greater than that of NaCl and KCl indicating certain natural flotation of this salt caused by some flotational hydrophobicity called in this paper metahydrophobicity. The metahydrophobicity of KPF6   was confirmed by flotation results. In the case of KPF6 the maximum yields of the same size particles were the highest, even though the density of this salt was greater than that of NaCl and KCl. Also, the first order kinetic constants were always the greatest for KPF6. Further flotometeric calculation based on the balance of forces involved in flotation indicated that the estimated contact angle of KPF6 was about 8 º assuming static flotation, and 7 º for dynamic flotation, while for NaCl and KCl was below 5 º . It means that during flotation test orthohydrophilic NaCl and KCl are only entrained while for metahydrophobic KPF6 there is mostly entrainment and some flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1141-1147
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kto był kim w III Rzeszy : leksykon
    Autorzy:
    Wistrich, Robert S.
    Współwytwórcy:
    Bieroń, Tomasz (1963- ). Tłumaczenie
    Dubiel, Paweł. Opracowanie
    Data publikacji:
    1997
    Wydawca:
    Kraków : Wydawnictwo Znak
    Tematy:
    Model Walter (1891-1945) biografia
    Model, Walter
    Grupa Armii "Środek" (Niemcy) dowódca biografia
    Opis:
    Dca Grupy Armii "Środek".
    S. 149-150, Model, Walter (1891-1945), feldmarszałek.
    Bibliogr. s. 248-254.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Kto był kim w III Rzeszy : leksykon
    Autorzy:
    Wistrich, Robert S.
    Współwytwórcy:
    Bieroń, Tomasz (1963- ). Tłumaczenie
    Dubiel, Paweł. Opracowanie
    Data publikacji:
    1997
    Wydawca:
    Kraków : Wydawnictwo Znak
    Tematy:
    Bach, Erich von dem (1899-1972) biografia
    Bach, Erich von dem (1899-1972)
    Generałowie Niemcy 20 w.
    Słownik biograficzny
    Opis:
    S. 18-19, Bach-Zelewski, Erich von dem (1899-1972), generał SS i policji odpowiedzialny za walkę z partyzantami na froncie wschodnim.
    Bibliogr. s. 248-254.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Kto był kim w III Rzeszy : leksykon
    Autorzy:
    Wistrich, Robert S.
    Współwytwórcy:
    Bieroń, Tomasz (1963- ). Tłumaczenie
    Dubiel, Paweł. Opracowanie
    Data publikacji:
    1997
    Wydawca:
    Kraków : Wydawnictwo Znak
    Tematy:
    Dirlewanger Oskar (1895-1945) biografia
    Dirlewanger Oskar
    Oficerowie
    Słownik biograficzny
    Opis:
    S. 45, Dirlewanger, Oskar (1895-1945), wysoki oficer SS, twórca specjalnego batalionu złożonego z przestępców i awanturników (1940).
    Bibliogr. s. 248-254.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Kto był kim w III Rzeszy : leksykon
    Autorzy:
    Wistrich, Robert S.
    Współwytwórcy:
    Bieroń, Tomasz (1963- ). Tłumaczenie
    Dubiel, Paweł. Opracowanie
    Data publikacji:
    1997
    Wydawca:
    Kraków : Wydawnictwo Znak
    Tematy:
    Greim Robert R. von (1892-1945) biografia
    Greim, Robert R. von
    Luftwaffe. Szósta (VI) Flota Powietrzna biografia
    Generałowie Niemcy 20 w.
    Słownik biograficzny
    Opis:
    Dca 6 Floty Powietrznej na froncie wschodnim.
    S. 79-80, Greim, Robert Ritter von (1892-1945) generał wojsk lotniczych, jeden z najlepszych pilotów Luftwaffe.
    Bibliogr. s. 248-254.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Single dose of green tea extract decreases lipid digestion and absorption from a test meal in humans
    Autorzy:
    Walkowiak, Jarosław
    Bajerska, Joanna
    Kargulewicz, Angelika
    Lisowska, Aleksandra
    Siedlerski, Gwidon
    Szczapa, Tomasz
    Kobelska-Dubiel, Natalia
    Grzymisławski, Marian
    Powiązania:
    https://bibliotekanauki.pl/articles/1039556.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    green tea
    digestion
    absorption
    mixed triglyceride breath test
    Opis:
    Background & Aims: Green tea is known worldwide for its high content of polyphenolic compounds and multifactorial beneficial effects on human health. The role of green tea as an inhibitor of lipid hydrolysis is widely discussed. The aim of the study was to assess the influence of green tea extract on lipid digestion and absorption. Methods: The study comprised 32 healthy volunteers aged 23 to 30 years with normal exocrine pancreatic function. In all subjects 13C-labelled mixed triglyceride breath test was performed twice with and without green tea extract ingestion. Cumulative percentage dose recovery was considered to reflect digestion and absorption of lipids. Values are expressed as medians and 1st-3rd quartile distribution. Results: In all subjects, cumulative percentage dose recovery values were normal in a placebo test (36.8% <30.1-43.3%>). These results were significantly higher (p=0.021) than those obtained in green tea extract test (28.8% <23.1-37.2%>). Results of six tests with GTE were abnormal. Conclusions: Single dose of green tea extract taken with a test meal decreases lipid digestion and absorption in humans.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 3; 481-483
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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