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    Wyświetlanie 1-4 z 4
    Tytuł:
    The role of friction in the mechanism of retaining the partial removable dentures with double crown system
    Autorzy:
    Dąbrowa, T.
    Dobrowolska, A.
    Wieleba, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/306716.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dental crown
    friction
    prosthodontic materials
    korona protetyczna
    protetyka stomatologiczna
    materiały stomatologiczne
    Opis:
    Cylindrical telescopic crowns belong to bolt dentures, because their adhesion strength is based on the friction force. The magnitude of static and slide friction forces depends on the strain within the contact area and properties of materials employed. Friction force value between telescope elements declines in the first phase of wearing period and, subsequently, maintains particular constant value of 8 to 10 N. In the telescopic technique, homo and heterogenic joints are used. The following prosthodontic materials have been examined: goldbase alloys (Degudent Kiss, Degulor M), cobalt-base alloy (Brealloy 270), ceramics (Zircon Oxide, Zirconia) during tribological investigations on FGP composite resin. The cooperating surfaces were moistened with synthetic saliva. The research confirmed the dependence of the static friction coefficient on the contact pressure for the analyzed pairs of materials used in prosthodontics. The biggest effect of the contact pressure on the coefficient of friction value occurs when the ceramic rubs on FGP composite resin. The most stable friction coefficient in the context of contact pressure changes as well as life has been found in the case of the cobalt alloy Brealloy 270. An interesting material is a gold alloy Degulor M, for which the coefficient of friction varies only slightly with pressure in the range of 0.6 to 0.9 MPa.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 4; 43-48
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on lineworks printed with different types of flexographic printing forms for purposes of printed electronics
    Autorzy:
    Krzyżkowski, J.
    Dąbrowa, T.
    Hamerliński, J.
    Śleboda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/115600.pdf
    Data publikacji:
    2015
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    printed electronics
    flexography
    printing
    drukowanie elektroniczne
    fleksografia
    druk
    Opis:
    Nowadays one can observe fast development of materials and technologies dedicated to inexpensive mass production of electronic devices with conventional printing techniques. One of them is flexography. In this paper investigation on quality of lineworks printed with flexographic printing technique for purposes of printed electronics is presented. There was analysed influence of different printing forms on printed elements reproduction accuracy. Results obtained with conventional graphic ink with commercially available conductive ink were compared as well. Aspects which should be taken under consideration when implementing flexography to printed electronics applications have been specified.
    Źródło:
    Challenges of Modern Technology; 2015, 6, 3; 3-9
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie odwzorowania elementów kreskowych w technice wklęsłodruku przy użyciu cylindrów formowych grawerowanych mechanicznie z zastosowaniem różnych metod i parametrów
    Evaluation of linework elements reproduction in gravure printing for different methods and parameters of electromechanical engraving
    Autorzy:
    Dąbrowa, T.
    Hamerliński, J.
    Hoppe, J.
    Krzyżkowski, J.
    Śleboda, P.
    Wojciechowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/128474.pdf
    Data publikacji:
    2014
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
    Tematy:
    wklęsłodruk
    cylinder formowy
    elementy kreskowe
    grawerowanie
    gravure printing
    linework elements
    engraving
    electrochemical engraving
    Opis:
    Gravure printing is used for high-volume production of high quality magazines and packagings. The method of printing form preparation, while satisfying the requirement for uniform and ink transfer and low image granularity, restricts the precision of linework elements, especially those used in securities and special printing. To overcome this problem, novel engraving methods have been developed. The Paper presented deals with the quality of linework reproduction using different combination of engraving parametres. The quality was assessed by printing a prepared test image containing commonly used linework elements, while using forms engraved with different parametres combinations. A printout with standard engraving parameter set was used as a reference point. Line separation, details reproduction, image resolution and ink optical density were measured to quantify the results. Printing parameters were identical for all samples. It was found that engraving parametres have negligible influence on text readability, but other linework elements, e.g. microlines, Landolt rings and concentric circles, may differ significantly if printed from a form engraved with different parameters. Moreover, the linework element reproduction depends on relation of element direction and engraving direction, as well as the convergence of engraving screen and linework elements’ distance. The minimum linework thickness required for stable reproduction for all electromechanical engraving methods and parametres was found to be between 100 and 150 microns.
    Źródło:
    Acta Poligraphica; 2014, 3; 9-27
    2299-9981
    Pojawia się w:
    Acta Poligraphica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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