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    Wyświetlanie 1-4 z 4
    Tytuł:
    Chemical passivation as a method of improving the electrochemical corrosion resistance of Co-Cr-based dental alloy
    Autorzy:
    Rylska, D.
    Sokołowski, G.
    Łukomska-Szymańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306992.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    odporność korozyjna
    stop stomatologiczny
    test elektrochemiczny
    pasywacja chemiczna
    corrosion resistance
    dental alloys
    electrochemical test
    chemical passivation
    Opis:
    Purpose: The purpose of the study was to evaluate corrosion resistance of Wirobond C® alloy after chemical passivation treatment. Methods: The alloy surface undergone chemical passivation treatment in four different media. Corrosion studies were carried out by means of electrochemical methods in saline solution. Corrosion effects were determined using SEM. Results: The greatest increase in the alloy polarization resistance was observed for passive layer produced in Na2SO4 solution with graphite. The same layer caused the highest increase in corrosion current. Generally speaking, the alloy passivation in Na2SO4 solution with graphite caused a substantial improvement of the corrosion resistance. The sample after passivation in Na2SO4 solution without graphite, contrary to others, lost its protective properties along with successive anodic polarization cycles. The alloy passivation in Na3PO4 solution with graphite was the only one that caused a decrease in the alloy corrosion properties. The SEM studies of all samples after chemical passivation revealed no pit corrosion – in contrast to the sample without any modification. Conclusions: Every successive polarization cycle in anodic direction of pure Wirobond C® alloy enhances corrosion resistance shifting corrosion potential in the positive direction and decreasing corrosion current value. The chemical passivation in solutions with low pH values decreases susceptibility to electrochemical corrosion of Co-Cr dental alloy. The best protection against corrosion was obtained after chemical passivation of Wirobond C® in Na2SO4 solution with graphite. Passivation with Na2SO4 in solution of high pH does not cause an increase in corrosion resistance of WIROBOND C. Passivation process increases alloy resistance to pit corrosion.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 73-78
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative characteristics of endodontic drills
    Autorzy:
    Loska, S.
    Basiaga, M.
    Pochrząst, M.
    Łukomska-Szymańska, M.
    Walke, W.
    Tyrlik-Held, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307518.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nikiel
    tytan
    stop
    Ni-Ti
    biomateriały
    endodontic instrument
    rotary instrument
    nickel
    titanium
    alloys
    Mtwo files
    Opis:
    The work concerns the analysis of influence of the wear process of endodontic instruments on the mechanical and physico-chemical properties of the materials from which they are made. A detailed study of the microstructure, mechanical properties and corrosion resistance in the environment simulating work of the tool was conducted. The research was done for the new Mtwo endodontic files and after six times of use. In addition, the observations with a scanning electron microscope in order to reveal possible damage caused by the impact of a corrosive environment were carried out. The results showed that use of the tool by six times revealed damage at the edges of the blades and may cause a lack of continuity of the cutting line resulting in the uneven distribution of the resistive force which acts on the tool during operation.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 75-83
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of resin composites modified with nanogold and nanosilver
    Autorzy:
    Sokołowski, J.
    Szynkowska, M. I.
    Kleczewska, J.
    Kowalski, Z.
    Sobczak-Kupiec, A.
    Pawlaczyk, A.
    Sokołowski, K.
    Łukomska-Szymańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306218.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    anogold
    nanosilver
    composite
    diametral tensile strength
    microhardness
    ion release
    light transmission
    nanosrebro
    kompozyty
    mikrotwardość
    transmisja światła
    Opis:
    Silver and gold have been used for centuries as antimicrobial agents. The aim of the study was to investigate diametral tensile strength, microhardness, ion release and light transmission of experimental resin composites. Flowable dental composite SDR (Dentsply, United Kingdom) was modified by nanogold, nanosilver and silica addition. The metal ion release, light transmission study, microhardness, Diametral Tensile Strength were evaluated. The experimental nanosilver-containing composites released significant amounts of Al, Si, Sr and Ba ions up to 30 days, and negligible silver ion amounts. Significant Ag ion release occurred in nanosilver- and nanogoldmodified composite. Resin composites modified with nanogold and nanosilver deposited on silica carrier exhibit lower light transmission and have opaque appearance. All experimental composites exhibited higher microhardness in comparison to non-modified resin composites. Diametral Tensile Strength of the experimental composites was comparable to the control group.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 1; 51-61
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of artificial neural networks to predict the deflections of reinforced concrete beams
    Autorzy:
    Kaczmarek, M.
    Szymańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178826.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reinforced concrete beams
    research
    deflection
    artificial neural network
    Opis:
    Nonlinear structural mechanics should be taken into account in the practical design of reinforced concrete structures. Cracking is one of the major sources of nonlinearity. Description of deflection of reinforced concrete elements is a computational problem, mainly because of the difficulties in modelling the nonlinear stress-strain relationship of concrete and steel. In design practise, in accordance with technical rules (e.g., Eurocode 2), a simplified approach for reinforced concrete is used, but the results of simplified calculations differ from the results of experimental studies. Artificial neural network is a versatile modelling tool capable of making predictions of values that are difficult to obtain in numerical analysis. This paper describes the creation and operation of a neural network for making predictions of deflections of reinforced concrete beams at different load levels. In order to obtain a database of results, that is necessary for training and testing the neural network, a research on measurement of deflections in reinforced concrete beams was conducted by the authors in the Certified Research Laboratory of the Building Engineering Institute at Wrocław University of Science and Technology. The use of artificial neural networks is an innovation and an alternative to traditional methods of solving the problem of calculating the deflections of reinforced concrete elements. The results show the effectiveness of using artificial neural network for predicting the deflection of reinforced concrete beams, compared with the results of calculations conducted in accordance with Eurocode 2. The neural network model presented in this paper can acquire new data and be used for further analysis, with availability of more research results.
    Źródło:
    Studia Geotechnica et Mechanica; 2016, 38, 2; 37-46
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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