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Wyszukujesz frazę "Mikolajczak, P.L." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Involvement of the different extracts from roots of Salvia miltiorrhiza Bunge on acute hypobaric hypoxia-induced cardiovascular effects in rats – preliminary report
    Autorzy:
    Buchwald, W.
    Mikolajczak, P.L.
    Krajewska-Patan, A.
    Dreger, M.
    Gorska-Paukszta, M.
    Szulc, M.
    Polcyn, P.
    Piorunska-Mikolajczak, A.
    Mielcarek, S.
    Czerny, B.
    Mrozikiewicz, P.M.
    Bobkiewicz-Kozlowska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/31897.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The present study was carried out to investigate the protective effects of roots of Salvia miltiorrhiza Bunge on hypobaric hypoxia. Two extracts of S. miltiorrhiza (extract 1: ethanol : water - 50 : 50; extract 2: 96% ethanol) were used. The experiments were performed after 7 consecutive days of administration of the extracts (200 mg/kg b.w., intragastrically) to male Wistar rats. Next, after placing animals for 60 min in the controlled acute hypobaric hypoxia (500 mm Hg) the systolic arterial blood pressure (SAP) in conscious rats, bioelectric heart activity in unconscious rats and analysis of oxidative stress parameters in the blood of rats: malonyldialdehyde (MDA) and lipid peroxidase (LPO) concentration, activity of superoxide dismutase (SOD) or glutathione peroxidase (GPX) were assayed. It was found out that the extract 1 augmented the lowering of SAP shown in hypoxia affected control rats. On the contrary the extract 2 reversed SAP to values obtained in control animals. Moreover, both extracts led to the normalization of hypoxia-induced tachycardia and levels of MDA, LPO and SOD. It seems that the above-mentioned effects are coupled with different active compounds content in the extracts, however more studies are needed to confirm this hypothesis.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Directional Solidification of AlSi Alloys with Fe Intermetallic Phases
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/379990.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    aluminum alloys
    calibration
    intermetallic phases
    krzepnięcie kierunkowe
    stopy aluminium
    kalibracja
    fazy międzymetaliczne
    Opis:
    Directional solidification technique is an important research instrument to study solidification of metals and alloys. In the paper the model [6,7,8] of directional solidification in special Artemis-3 facility was presented. The current work aimed to propose the ease and efficient way in calibrating the facility. The introduced M coefficient allowed effective calibration and implementation of defined thermal conditions. The specimens of AlSi alloys with Fe-rich intermetallics and especially deleterious β-Al5FeSi were processed by controlled solidification velocity, temperature gradient and cooling rate.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 75-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Assessment of Mushy Zone in Directional Solidification
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/380005.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    directional solidification
    mushy zone
    CALPHAD technique
    Fe intermetallics
    β-Al5FeSi
    stop aluminium
    krzepnięcie kierunkowe
    strefa półciekła
    technika CALPHAD
    Opis:
    Solidification of AlSiFe alloys was studied using a directional solidification facility and the CALPHAD technique was applied to calculate phase diagrams and to predict occurring phases. The specimens solidified by electromagnetic stirring showed segregation across, and the measured chemical compositions were transferred into phase diagrams. The ternary phase diagrams presented different solidification paths caused by segregation in each selected specimen. The property diagrams showed modification in the sequence and precipitation temperature of the phases. It is proposed in the study to use thermodynamic calculations with Thermo-Calc which enables us to visualize the mushy zone in directional solidification. 2D maps based on property diagrams show a mushy zone with a liquid channel in the AlSi7Fe1.0 specimen center, where significant mass fraction (33%) of β-Al5FeSi phases may precipitate before α-Al dendrites form. Otherwise liquid channel occurred almost empty of β in AlSi7Fe0.5 specimen and completely without β in AlSi9Fe0.2. The property diagrams revealed also possible formation of α–Al8Fe2Si phases.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 101-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Contact Gap in Directional Solidification of AlSiFe Alloys
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/381310.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    aluminium alloys
    calibration
    intermetallic phases
    krzepnięcie kierunkowe
    stop aluminium
    kalibracja
    faza międzymetaliczna
    Opis:
    One of the methods to study solidification of alloys and metals is directional solidification. In the paper the effect of the contact gap between the analyzed specimen and the bottom heater was analysed. The occurring contact gap caused the increase in planned solidification velocity. For the facility calibration the methodology with M coefficient was applied. The experiments revealed efficient values of M and allowed to conduct efficiently the directional solidification of AlSiFe alloys in wide range of growth rates. The effect of the contact gap seems to be random phenomena and most difficult factor influencing precisely planned directional solidification.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 41-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three Dimensional Morphology of β-Al5FeSi Intermetallics in AlSi Alloys
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/383272.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    intermetallics
    β-Al5FeSi
    X-ray tomography
    morphology
    solidification
    stop aluminium
    intermetalik
    tomografia rentgenowska
    Opis:
    Iron is the most common and detrimental impurity in casting alloys and has been associated with many defects. The main consequence of the presence or adding of iron to AlSi alloys is the formation Fe-rich intermetallics with especially deleterious β-Al5FeSi. β-Al5FeSi phases are most often called needles on 2D micro sections, whilst platelets in 3D geometry. The x-ray tomography results have demonstrated Fe-rich phases with shapes different from simple forms such as needles or platelets and presented bent and branched phases. β grown as complicated structure of bent and branched intermetallics can decrease feeding ability, strengthen pores nucleation and eutectic colonies nucleation leading to lower permeability of mushy zone and porosity in the castings.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray tomography investigation of Fe-rich intermetallics in AlSi alloys
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/381463.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    intermetallics
    β-Al5FeSi
    X-ray tomography
    melt flow
    stop aluminium
    związek międzymetaliczny
    tomografia rentgenowska
    szybkość przepływu
    Opis:
    Iron exists as a common impurity element in AlSi foundry alloys. The main consequence of the presence or adding of iron to AlSi alloys is the formation Fe-rich intermetallics with especially deleterious β-Al5FeSi. This work aims to identify the role of fluid flow on the microstructure and intermetallics in Al-9 wt.% Si-0.2/0.5/1.0 wt.% Fe alloys directionally solidified under defined thermal and fluid flow conditions and extensively uses 3D x-ray tomography to get a better insight into their morphology and formation. The results have revealed the growth of larger and more dense β-Al5FeSi intermetallics in the specimen centre as an effect of forced flow. The reconstructions confirmed that the course of number density at the specimen cross section increases from the specimen edge to its centre.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 79-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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