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    Wyświetlanie 1-4 z 4
    Tytuł:
    Biodentine management and setting time with Vicat and Vickers evaluation; a survey-based study on clinicians experience
    Autorzy:
    Buła, K.
    Palatyńska-Ulatowska, A.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818516.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    materials
    biomaterials
    biodentine
    tricalcium silicate cement
    setting time
    materiały
    biomateriały
    biodentyna
    cement trójwapniowy
    czas wiązania
    Opis:
    Purpose: of this paper was to analyse clinicians’ views on the management and handling procedures of the Biodentine tricalcium silicate cement with the following evaluation of the real setting time of the material with two independent physical tests. Design/methodology/approach: A survey study included 174 clinicians who answered the questionnaire designed to collect opinions on the Biodentine management during endodontic procedures. To verify the setting time of the cement, two independent hardness tests were performed. Macroscopic evaluation was carried out using the Vicat device. Microscopic assessment with subsequent SEM observation was conducted with the aid of the Clemex appliance. Findings: 43% of respondents using Biodentine in their practice described the setting time as long or definitively too long. One fifth of the dentists surveyed continue dental procedures without waiting. The setting time tests confirmed the existence of two phases of the Biodentine setting process, which corresponds to the general definition of cement setting. After mixing of the material, the initial setting stage lasts for 15 minutes. The next one, described by the authors as “maturation” of Biodentine lasts for 120 minutes. Research limitations/implications: The material initially sets within 15 minutes, however it is not the end of the process. In certain endodontic procedures the awareness of a longer setting time of Biodentine is essential for decision-making in root canal therapy. Practical implications: It is advisable to divide the endodontic treatment with Biodentine into two separate appointments. Originality/value: From the clinicians’ perspective the setting time and correct handling of Biodentine are crucial factors in the successful endodontic therapy. The information regarding proper material management is included in this paper
    Źródło:
    Archives of Materials Science and Engineering; 2020, 103, 2; 75--85
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of IR thermography to show the mold and part temperature evolution in injection molding
    Autorzy:
    Bula, K.
    Różański, L.
    Marciniak-Podsadna, L.
    Wróbel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/94156.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    IR thermography
    injection molding process
    polypropylene
    termografia w podczerwieni (IR)
    formowanie wtryskowe
    polipropylen
    Opis:
    This study concerns the application of infrared camera for injection molding analysis by measuring temperatures of both injection molded parts and injection mold cavities in a function of injection cycles. The mold with two cavities, differing in thickness (1 and 3 mm), and a cold direct runner was used. Isotactic polypropylene homopolymer was utilized to produce parts. Mold temperature was set at 22OC and controlled by a water chiller. Five measuring points were determined: SP1, SP2 (placed in the 3 mm cavity), SP3, SP4 (located in the 1 mm cavity) and SP5 around an injection molding gate. Our investigations showed that the highest temperature is localized around SP2 point and the lowest at SP4. Also, it was proved that even after 62 injection molding cycles, temperatures of cavities were not stable, revealing their further increase with each cycle.
    Źródło:
    Archives of Mechanical Technology and Materials; 2016, 36; 40-43
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected methods for improving operating conditionsof three-phase systems working in the presenceof current and voltage deformation – part II
    Autorzy:
    Pasko, M.
    Buła, D.
    Dębowski, K.
    Grabowski, D.
    Maciążek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141598.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active power filters
    compensation of higher harmonics
    hybrid active power filters
    power quality
    symmetrisation
    Opis:
    The paper includes a summary of long-time research conducted by a research team in the Institute of Electrical Engineering and Computer Science at Silesian University of Technology. The research work has principally been related to selected problems in the field of analysis and synthesis of systems aimed at symmetrisation and improvement of some power quality parameters. This paper constitutes the second part of the report on the research. It has been devoted to three-phase system symmetrisation as well as effective elimination of higher harmonics and substantial improvement of power quality by means of hybrid active power filters.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 3; 603--616
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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