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    Wyświetlanie 1-9 z 9
    Tytuł:
    PEO layers on Mg-based metallic glass to control hydrogen evolution rate
    Autorzy:
    Cesarz-Andraczke, K.
    Kazek-Kęsik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200823.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    amorphous magnesium alloys
    corrosion rate
    plasma electrolytic oxidation
    hydrogen evolution
    Opis:
    The amorphous Mg-based alloys may be used as metallic biomaterials for resorbable orthopedic implants. The Mg-Zn-Ca metallic glasses demonstrate variable in time degradation rate in simulated body fluid. In this work the Mg66Zn30Ca4 alloy was chosen as a substrate for coatings. This paper reports on the surface modification of a Mg66Zn30Ca4 metallic glass by plasma electrolytic oxidation (PEO). The structure characterization of uncoated Mg66Zn30Ca4 alloy was performed by using TEMand XRD method. The immersion tests of coated and uncoated Mg66Zn30Ca4 alloy were carried out in Ringer’s solutionat 37°C. The volume of released hydrogen by immersion tests was determined. The coatings structure and chemical composition after immersion tests by SEM/EDS were studied. Based on SEM images of surface structure samples, immersion tests results and hydrogen evolution measurement was proposed the course of corrosion process in Ringer’s solution for Mg-based metallic glasses with PEO coating. Results of immersion tests in Ringer’s solution allowed to determine the amount of evolved hydrogen in a function of time for Mg66Zn30Ca4 metallic glass and sample with PEO coating. In comparison to the non-coated Mg66Zn30Ca4 alloy, the sample with PEO layer showed a significantly decreased hydrogen evolution volume.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 119-124
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grain-Size Prediction Model in Aluminum Castings Manufactured by Low-Pressure Technology
    Autorzy:
    Fernández-Calvo, A. I.
    Lizarralde, I.
    Sal, E.
    Rodríguez, P.
    de Zabalegui, E. O.
    Cia, I.
    Rios, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/106923.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    grain refinement
    AlSi7Mg alloy
    thermal modulus
    cooling rate
    solidification evolution
    Opis:
    The grain refinement in a real casting manufactured by Low Pressure Die Casting (LPDC) such as wheels and steering knuckles depends on the grain-refinement potential of the metal and the geometry of the part/process parameters. For this study, the effect of the cooling rate on the AlSi7Mg alloy with different metal qualities in terms of grain refinement was tested. The grain size has been metallographically evaluated in cylindrical test pieces and in the real wheels and steering knuckles manufactured at the Mapsa and Fagor Ederlan foundries. The Thermolan®-Al system has been used to evaluate the nucleation potential in terms of grain size on a standard cup. The grain size has been modeled taking into account the effect of the cooling rate measured in the center of the cylindrical test parts and the different grain-size potential. Different grades of refinement have been tested. The grain size measured in a real casting (wheel and steering knuckle) was used to calibrate the model for a real part in LPDC for different grain-size potential.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 4; 71-77
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neogene radiolarian biostratigraphy and faunal evolution rates in the eastern equatorial Pacific ODP Sites 845 and 1241
    Autorzy:
    Kamikuri, S.-I.
    Motoyama, I.
    Nishi, H.
    Iwai, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21655.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Neogene
    Radiolaria
    biostratigraphy
    fauna
    evolution rate
    Pacific Ocean
    Late Miocene
    Miocene
    Middle Miocene
    paleontology
    microfossil
    Opis:
    Radiolarians from Sites 845 and 1241 in the eastern equatorial Pacific were examined in order to evaluate the role of paleoceanographic perturbations upon the general faunal evolutionary pattern of tropical planktonic organisms during the last 17 Ma. Radiolarian appearance and extinction rates indicate no periods of mass extinctions during the past 17 Ma. However, a relatively rapid replacement of the species in the radiolarian assemblages occurs near the middle–late Miocene boundary. This replacement event represents the gradual extinction of a number of radiolarian species and their gradual replacement by evolving new species. The modern equatorial circulation system was formed near the middle–late Miocene boundary due to the closure of the Indonesian seaway. The minor faunal turnover appears to be associated with the formation of the modern equatorial circulation system near the middle–late Miocene boundary. Diatom assemblages in the equatorial Pacific became more provincial in character after about 9 Ma. The appearance and extinction rates of planktic foraminifers were relatively high near the middle–late Miocene boundary, and those of calcareous nannoplankton reached high values in the early late Miocene in the equatorial Pacific Ocean. Thus, faunal evolution from the middle Miocene type to late Miocene types occurred first, being followed by floral evolution. The middle–late Miocene boundary is not a sharp boundary for planktonic microfossils, but marks a time of transition critical for faunal and floral evolution in both siliceous and calcareous microfossil assemblages in the equatorial Pacific Ocean.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DNA asymmetry and the replicational mutational pressure
    Autorzy:
    Kowalczuk, M
    Mackiewicz, P.
    Mackiewicz, D.
    Nowicka, A.
    Dudkiewicz, M.
    Dudek, M.R.
    Cebrat, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041201.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    evolution rate
    selection pressure
    DNA asymmetry
    mutational pressure
    protein
    amino acid
    nucleotide composition
    genome
    DNA walk
    composition
    Źródło:
    Journal of Applied Genetics; 2001, 42, 4; 553-577
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution of singular optimal control problems using the improved differential evolution algorithm
    Autorzy:
    Lobato, F. S.
    Steffen, Jr, V.
    Silva Neto, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/91654.pdf
    Data publikacji:
    2011
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    differential evolution algorithm
    optimal control
    dynamic updating
    population
    convergence rate
    mechanical engineering
    chemical engineering
    Opis:
    The Differential Evolution algorithm, like other evolutionary techniques, presents as main disadvantage the high number of objective function evaluations as compared with classical methods. To overcome this disadvantage, this work proposes a new strategy for the dynamic updating of the population size to reduce the number of objective function evaluations. This strategy is based on the definition of convergence rate to evaluate the homogeneity of the population in the evolutionary process. The methodology is applied to the solution of singular optimal control problems in chemical and mechanical engineering. The results demonstrated that the methodology proposed represents a promising alternative as compared with other competing strategies.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 3; 195-206
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of Gas Emission from Heated Moulding Sands Together with the On-line Assessment of H2 and O2 Fractions - New Investigation Method
    Autorzy:
    Mocek, J.
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379867.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas emission
    evolution rate
    hydrogen content
    oxygen content
    moulding sand
    resin
    burning
    moulding sand destruction
    emisja gazu
    tempo rozwoju
    zawartość wodoru
    zawartość tlenu
    masa formierska
    żywica
    spalanie
    Opis:
    The new investigation method of the kinetics of the gas emission from moulding sands used for moulds and cores is presented in this paper. The gas evolution rate is presented not only as a function of heating time but also as a function of instantaneous temperatures. In relation to the time and heating temperature the oxygen and hydrogen contents in evolving gases was also measured. This method was developed in the Laboratory of Foundry Moulds Technology, Faculty of Foundry Engineering, AGH. Gas amounts which are emitted from the moulding sand at the given temperature recalculated to the time unit (kinetics) are obtained in investigations. Results of investigations of moulding sand with furan resin are presented - as an example - in the paper.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New fossil remains from the Pliocene Koetoi Formation of northern Japan provide insights into growth rates and the vertebral evolution of porpoises
    Autorzy:
    Murakami, M.
    Shimada, C.
    Hikida, Y.
    Hirano, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/945576.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    new fossil
    remains
    Pliocene
    Koetoi Formation
    Japan
    growth rate
    vertebrate evolution
    Mammalia
    Phocoenidae
    age estimation
    Opis:
    Extant porpoises (Phocoenidae) are odontocetes characterized by their small size, short and wide rostrum, late (or absent) completion of epiphyseal ankylosis in the vertebral column (= physical maturity), and short life cycles, all of which are thought to have resulted from progenetic evolution. We describe a small fossil phocoenid from the lower Pliocene Koetoi Formation of Hokkaido (northern Japan), preserving a small, narrow rostrum, as well as anteroposteriorly elongate thoracic and lumbar vertebral centra with completely fused epiphyses. Physical maturity in this specimen occurred significantly earlier than in extant phocoenids, as shown by dental data indicating that the specimen died at only four years of age. The difference between the present material and extant porpoises may be attributable to different growth rates during ontogeny. The long centra and caudally inclined neural spines of the specimen from Hokkaido are primitive characters among phocoenids. By contrast, the great height of its neural spines is highly derived, even among extant species, and suggestive of a fast swimmer. In terms of its vertebral morphology, the new specimen falls within a morphological continuum defined by the archaic Numataphocoena yamashitai and the highly derived vertebral morphology of Phocoenoides dalli. Phocoenid vertebral evolution has been complex and frequently convergent, as opposed to stepwise and unidirectional. The different vertebral morphologies of the new specimen and the contemporaneous extinct taxa Numataphocoena and Piscolithax longirostris indicate that they were adapted to different environments.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 1; 97-111
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FACTORS INFLUENCING CONSERVATISM AND PURISM IN LANGUAGES OF NORTHERN EUROPE (NORDIC, BALTIC, FINNIC)
    Autorzy:
    Piechnik, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/634593.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    conservatism, purism, change, rate, evolution, Nordic, Germanic, Baltic, Finnic
    Opis:
    This paper shows common extralinguistic factors influencing conservatism and purism in languages of Northern Europe (Nordic, Baltic, Finnic). Users’ motivation, environment, culture, history and conscious policy are the keys to understand some tendencies in the slower rate of change of these languages.
    Źródło:
    Studia Linguistica Universitatis Iagellonicae Cracoviensis; 2014, 131, 4
    2083-4624
    Pojawia się w:
    Studia Linguistica Universitatis Iagellonicae Cracoviensis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of strain rate on microstructure and mechanical behavior of P/M feal
    Wpływ prędkości odkształcenia na strukturę i charakter plastycznego płynięcia stopu FeAl otrzymanego metodą metalurgii proszków
    Autorzy:
    Śleboda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/950798.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    stopy Fe-Al
    struktura
    odkształcenie plastyczne
    prędkość odkształcenia
    metalurgia proszków
    FeAl alloys
    microstructural evolution
    mechanical behavior
    strain rate
    powder metallurgy
    Opis:
    As part of a broader study of the thermomechanical processing of P/M FeAl alloys, this research is focused on the influence of processing strain rate on the microstructural evolution and mechanical behavior of the processed materials. For the purposes of this study, water atomized FeAl powder was consolidated by hot pressing resulting in fully dense products. The consolidated P/M samples were thermomechanically processed in compression at 800 and 900oC at strain rates of 0.1 s-1 and 10 s-1, to a true strain of 1. The influence of thermomechanical processing parameters on the material flow and microstructural development of investigated alloy was analyzed. Considerable strain rate sensitivity of investigated alloy was observed, specially with reference to microstructural development.
    W niniejszej pracy przedstawiono wybrane wyniki badań wpływu prędkości odkształcenia na rozwój mikrostruktury oraz charakter odkształcenia plastycznego stopu z grupy FeAl. W badaniach zastosowano rozpylany wodą proszek stopu. W pełni zagęszczone poprzez prasowanie na gorąco próbki z proszków poddano próbie ściskania w temperaturach 800°C oraz 900°C przy prędkościach odkształcenia równych 0.1 s(-1) oraz 10 s(-1), do wartości odkształcenia rzeczywistego równej 1. W materiałach odkształconych w temperaturze 800°C rozdrobnienie mikrostruktury nastąpiło tylko przy większej prędkości odkształcenia (10 s(-1) ), natomiast w temperaturze 900°C materiał uległ rekrystalizacji niezależnie od prędkości odkształcenia. Badania wykazały stosunkowo dużą czułość stopu na prędkość odkształcenia, szczególnie w odniesieniu do zmian strukturalnych związanych z procesami rekrystalizacji.
    Źródło:
    Metallurgy and Foundry Engineering; 2008, 34, 2; 133-138
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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