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    Wyświetlanie 1-9 z 9
    Tytuł:
    Preparatyka do celów mikroskopii świetlnej i skaningowej
    Autorzy:
    Kloc-Ptaszna, A.
    Pakieła, W.
    Snopiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/274012.pdf
    Data publikacji:
    2017
    Wydawca:
    Roble
    Tematy:
    preparatyka próbek do badań mikroskopowych
    metalograficzne badania mikroskopowe
    sample preparation for microscopy
    microscopic metallographic examinations
    Źródło:
    LAB Laboratoria, Aparatura, Badania; 2017, 22, 6; 24-28
    1427-5619
    Pojawia się w:
    LAB Laboratoria, Aparatura, Badania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of silver-containing filler on antibacterial properties of experimental resin composites against Enterococcus faecalis
    Autorzy:
    Adeeb, S.
    Chladek, G.
    Pakieła, W.
    Mertas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055745.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    resin composites
    Enterococcus faecalis
    antimicrobial properties
    silver
    dental restorative material
    dental materials
    kompozyty żywiczne
    paciorkowiec kałowy
    właściwości antybakteryjne
    srebro
    materiał do wypełnień dentystycznych
    materiały dentystyczne
    Opis:
    Purpose: The aim of the presented work was to investigate the impact of the S-P introduction into resin-based composites on their effectiveness against Enterococcus faecalis (E. faecalis). Design/methodology/approach: Seven experimental composites based on typical matrix were developed. Six of them contained a filler with antimicrobial properties (silver sodium hydrogen zirconium phosphate, S-P), while the control material contained only common reinforcement fillers. The materials were characterized in terms of the dispersion of the extender in the matrix and then subjected to microbiological tests. The efficiency in the reduction of E. faecalis in the microenvironment was tested. Findings: The composites show a satisfactory distribution of fillers and a high initial reduction of bacteria colonies for the tested strain of E. faecalis. The reduction in bacteria colonies achieved for S-P concentrations from 7% to 13% was similar (median value from 99.8 to 99.9%, when for control material and compound with 1% S-P the number of colonies increased compared to positive control. Research limitations/implications: Laboratory test results may differ from in vivo test performance. In addition, there are many models for conducting laboratory antimicrobial efficacy studies, the results of which are also varied. The cytotoxic tests, long-term investigations and in vivo experiments need to be performed in future experiments. Practical implications: E. faecalis is a Gram-positive bacterium that is commonly detected in persistent endodontic infections and may enter the root canal through the coronal part. Development of composites with antimicrobial properties against this bacterium is as important as obtaining efficacy against cariogenic bacteria. Originality/value: The antimicrobial effectiveness against E. faecalis of experimental composites with submicrometer-sized particles of S-P was not investigated until now.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 109, 2; 59--67
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of the Aluminium Alloy EN AC-51100 after Laser Surface Treatment
    Autorzy:
    Tański, T.
    Pakieła, W.
    Janicki, D.
    Tomiczek, B.
    Król, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353290.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser treatment
    aluminium alloy
    silicon carbide
    wear resistance
    Opis:
    In this paper, the influence of a laser surface treatment on the structure and properties of aluminium alloy has been determined. The aim of this work was to improve the tribological properties of the surface layer of the EN AC-51100 aluminium alloy by simultaneously melting and feeding silicon carbide particles into the molten pool. The silicon carbide powder was introduced into the liquid metal using a gravity feeder within a constant feed rate of 1 g/min. A high power diode laser (HPDL) was used for remelting. Laser beam energies used in experiments were 1.8 kW, 2.0 kW and 2.2 kW, combined with the constant velocity of 50 mm/min. As a result of the laser treatment on the aluminium alloy, a composite layer with greater hardness and wear resistance compared to the based material was obtained.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 199-204
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected tribological parameters for silumin alloy used for engine piston
    Autorzy:
    Kozuba, J.
    Wieszała, R.
    Mendala, J.
    Roszak, M.
    Pakieła, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175806.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tribology
    piston engines
    coefficient of friction
    tribologia
    silniki tłokowe
    współczynnik tarcia
    Opis:
    Purpose: The conducted tests were aimed at determining whether the tested material meets the requirements for wear resistance in modern turbocharged combustion engines where there is an increased temperature and higher pressure. Design/methodology/approach: The tests were performed in a pin-on-disc system, according to the ASTM G 99 standard. Findings: The article presents the results of the coefficient of friction, the amount of wear, chemical analysis and surface profile of the tested material A390.0 in combination with EN GJL-350 cast iron. Research limitations/implications: The tested materials are used in the construction of pistons for internal combustion engines, therefore the test parameters were selected to take into account the operating conditions in a turbocharged engine with a power of up to 100 kW. Practical implications: After analysing the properties of the A390.0 alloy at elevated temperatures, it was found that without additional modifications, the alloy cannot be used in modern combustion engines, in particular with turbocharging. Originality/value: Presents the results of research concerning mechanical properties (HB, HV, Rm) and yield properties (R0.2, A5, Z) of the examined alloy.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 107, 2; 64--71
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Chemical Composition on the Properties of Experimental Silicone-Based Soft Lining Composites
    Autorzy:
    Jabłońska-Stencel, E.
    Pakieła, W.
    Żmudzki, J.
    Kasperski, J.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/355272.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental material
    soft lining
    silicone
    silica filler
    mechanical properties
    Opis:
    The paper analyses the influence of chemical composition of silicone-based composites on their properties in the aspect of using them as long-term soft denture lining materials. Different concentrations of filler and methylhydrosiloxane-dimethylsiloxane copolymer were used. The filler was introduced into the composite with mechanical mixing combined with ultrasonic homogenization. Scanning electron microscopy was used to investigate the quality of filler dispersion. Shore A hardness, tensile strength, sorption, solubility and tensile bond strength to poly(methyl methacrylate) were measured. Tests show satisfactory results for some experimental composites, which met all the requirements for such materials.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1371-1377
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of laser surface treatment on structure and mechanical properties aluminium Alloy enac-AlMg9
    Autorzy:
    Pakieła, W.
    Dobrzański, L. A.
    Labisz, K.
    Tański, T.
    Basa, K.
    Roszak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355852.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser
    surface treatment
    laser feeding
    composite layer
    wear resistance
    aluminium alloys
    Opis:
    The effect of laser surface treatment on structure and mechanical properties aluminium Alloy enac-AlMg9 In this work, the influence of a high power diode laser surface treatment on the structure and properties of aluminium alloy has been determined. The aim of this study was to improve the mechanical and tribological properties of the surface layer of the aluminium alloy by simultaneously melting and feeding tungsten carbide particles into the molten pool. During the process was used high-power diode laser HPDL. In order to remelt the aluminium alloy surface the HPDL laser of 1.8, 2.0 and 2.2 kW laser beam power has been used. The linear laser scan rate of the beam was set 0.5 em's. In order to protect the liquid metal during laser treatment was used argon. As a base material was used aluminium alloy ENAC -AlMg9. To improve the surface mechanical and wear properties of the applied aluminium alloy was used biphasic tungsten carbide WC/W2C. The size of alloying powder was in the range 110-210 μm. The ceramic powder was introduced in the remelting zone by a gravity feeder at a constant rate of 8 g/m.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1343-1350
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Different Inorganic Fillers on Mechanical Properties and Degree of Conversion of Dental Resin Composites
    Autorzy:
    Stencel, R.
    Pakieła, W.
    Barszczewska-Rybarek, I.
    Żmudzki, J.
    Kasperski, J.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352485.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resin composites
    dental materials
    filler
    mechanical properties
    degree of conversion
    Opis:
    The aim of the study was to evaluate the influence of different fillers on the chosen functional properties of experimental composites based on typical polymeric matrix, in order to understand the effect of different fillers on their properties and to develop a simple base composite for further investigations with experimental fillers, e.g. with antimicrobial properties. Previous experiments have been usually based on commercially available composites of unknown composition or compilation of monomers, without reinforcing fillers. Scanning electron microscopy was used to investigate the quality of fillers’ dispersion, which was satisfying. Results showed significant differences between materials’ diametral tensile strength (p = 0.0019), compressive strength (p < 0.0001), Vickers microhardness (p < 0.0001), flexural modules (p = 0.0018), and the degree of conversion (p < 0.0001), but flexural strength was not significantly different (p = 0.0583). Investigations indicated that no filler type had an especially positive impact on the mechanical properties, but reinforcement effect was achieved by proper compilation of silica nanofiller and variable glass fillers. Nanofiller decreased the degree of conversion.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1361-1369
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie spektrometrii mas z jonizacją w plazmie indukcyjnie sprzężonej z mikropróbkowaniem laserowym do oznaczania składu pierwiastkowego pyłów
    Application of laser ablation inductively coupled plasma mass spectrometry in determinations of elemental composition of powders
    Autorzy:
    Pakieła, M.
    Wojciechowski, W.
    Bulska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074722.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    LA-ICP-MS
    badanie laserowe próbek
    pyły
    laser microsampling
    powders
    Opis:
    In laser ablation (LA) a very little amount of solid material is transferred to the gas phase followed by its transport to the source of excitation. The coupling of laser ablation with inductively coupled plasma (ICP) and mass analyzer (MS) allows direct determination of elemental composition of solids. In the case of congested solid samples, LA ICPMS makes possible analysis of element distribution in surface and sub-surface domains of a sample. Unfortunately, not all solid substances appear in congested form as sometimes an analyst receives solid samples in a form of powder. The number of papers related to the possibilities of quantitative analysis of disintegrated samples has been increasing during last years. However, direct analysis of powders, such as soils, sediments or dust, is not possible. Thus the initial step in preparation of such samples is their immobilization in support base, which enables analysis of material of interest without changing sample properties. In this article the possibilities of analysis of immobilized powder samples using ablation process are presented. Homogeneity of powder deposition, purity of material and quality of the ablation process are important parameters and may be used as criteria. Correctness of material selection has to be always confirmed with chosen reference materials. The procedure allowing uniform and reproducible immobilisation of bottom sediment as well as a calibration measurement system with the use of external standards with similar matrix as samples are presented.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 12; 1084-1089
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and properties of nanomaterials produced by severe plastic deformation
    Autorzy:
    Pakieła, Z.
    Garbacz, H.
    Lewandowska, M.
    Drużycka-Wiencek, A.
    Suś-Ryszkowska, M.
    Zieliński, W.
    Kurzydłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146207.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nanocrystalline metals
    severe plastic deformation
    mechanical properties
    Opis:
    In recent years, a number of methods for refining the structure of metals by severe plastic deformation (SPD) have been developed. Some of those methods permit grain refinement to a nanometric level. These methods include, among others, high pressure torsion (HPT), equal channel angular pressing (ECAP) and hydrostatic extrusion (HE). The aim of this paper was a more detailed description of these methods and presentation of exemplary applications of these methods for structure refinement and improvement of mechanical properties of chosen materials. The results obtained in the present study show that the microstructures of the materials subjected to SPD studied in this work displayed considerable refinement, characterised by the formation of nanosized grains. Such a refinement resulted in increased tensile strength and hardness of the SPD materials studied in this work. In view of the results obtained on a large number of metals and alloys, a conclusion can be drawn that SPD could become an attractive way of processing materials for variety of applications.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 19-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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