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    Wyświetlanie 1-4 z 4
    Tytuł:
    Grammars in genetic programming
    Autorzy:
    Wieczorek, W.
    Czech, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/205856.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    algorytm genetyczny
    gramatyka
    genetic algorithms
    grammars
    strongly typed genetic programming
    Opis:
    The work consists of two parts. In the first part the idea of genetic programming is presented and the basic elements of a genetic programming system are described. In the second part, considering a selected example, we describe the results of investigations of the influence of program grammars on the efficiency of genetic programming.
    Źródło:
    Control and Cybernetics; 2000, 29, 4; 1019-1030
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the light source and curing parameters on microhardness of a silorane-based dental composite material
    Autorzy:
    Malara, P.
    Czech, Z.
    Świderski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356555.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental composite material
    light-curing
    silorane
    microhardness
    Opis:
    The aim of the study was to determine the influence of the light source and the light-curing parameters (the distance of the material from the light source and time of light-curing) on microhardness of Flitek Silorane dental composite material. Standardized samples of Filtek Silorane material were cured using two types of Light Curing Units (LCUs) - halogen and LED. The distance of the light source and time of curing differed between samples. The Knoops microhardness was tested using microhardness tester Micromet 5103. Using LED light curing unit allowed to achieve significantly higher microhardness of silorane-based dental material Filtek Silorane than using halogen light curing unit. Decreasing the distance from the light source to the surface of silorane-based material Filtek Silorane improved its microhardness. A prolonged curing time could compensate the drop in microhardness of Filtek Silorane material resulting from an increased distance from the light source to the surface of the material only in a limited range of intervals.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1331-1336
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reducing of on polymerization shrinkage by application of UV curable dental restorative composites
    Autorzy:
    Świderska, J.
    Czech, Z.
    Świderski, W.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778914.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    dental compositions
    polymerization shrinkage
    multifunctional methacrylates
    UV-curin
    Opis:
    This manuscript describes dental compositions contain in-organic fillers, multifunctional methacrylates and photoinitiators. The main problem by application and UV curing process is the shrinkage of photoreactive dental materials during and after UV curing process. Total shrinkage of UV curable dental composites is a phenomenon of polymerization shrinkage, typical behavior for multifunctional methacrylates during polymerization process. The important factors by curing of dental composites are: kind and concentration of used methacrylates, their functionality, double bond concentration, kind and concentration of added photoinitiator and UV dose. They are investigated UV-curable dental compositions based on 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl)phenyl]propane (Bis-GMA) and containing such multifunctional monomers as 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), tetraethylene glycol dimethacrylate (T3EGDMA), trimethylolpropane trimethacrylate (TMPTMA), polyethylene glycol 200 dimethacrylate (PEG200DA). Reduction of polymerization shrinkage of dental compositions is at the moment a major problem by dental technology.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 51-55
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation, properties and potential applications of a photocurable varnish with pleasant limonene smell
    Autorzy:
    Bednarczyk, P.
    Wróblewska, A.
    Czech, Z.
    Malko, M.W.
    Rozwadowski, Z.
    Markowska-Szczupak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778106.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    varnishes with limonene
    smelling varnishes
    urethane acrylate
    UV-curing coating
    Opis:
    Photocurable materials which are obtained on the basis of urethane acrylate resins are often used in the industry for the production varnishes or protective coatings. The main disadvantage which is connected with the utilization of these varnishes is their unpleasant smell during the process of production and curing. This work presents the photocurable varnish which was obtained on the basis of aliphatic urethane acrylate and R-(+)-limonene. The utilization of this raw materials allows to obtain the smelling coatings. The aim of this work were the studies on the influence of limonene molecules on the mechanical properties of the UV-cured coatings. These studies showed that the coatings with limonene molecules retain their properties, and are characterized by the very good adhesion, cohesion and high gloss. These kinds of varnishes can be applied for preparation of appropriate protective coatings on the surface of wood, metals, and nail plates. These protective coatings have not only pleasure smell but also can have the bactericidal and fungicidal properties. The studies performed with Escherichia coli ATCC29425 and Candida albicans confirmed these properties.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 2; 13-19
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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