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    Wyświetlanie 1-3 z 3
    Tytuł:
    Tightness and material aspects of bolted flange connections with gaskets of nonlinear properties exposed to variable loads
    Autorzy:
    Walczak, R.
    Pawlicki, J.
    Zagórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355970.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    material
    bolted flange connection
    gasket
    tightness
    Opis:
    Tightness and material aspects of bolted flange connections with gaskets of nonlinear properties exposed to variable loads The paper presents the problems regarding bolted flange connections with gaskets used in chemical, petrochemical and energy industry. The aim of the research is to present state of knowledge regarding pipelines and apparatus in industrial installations and rules and regulations regarding flange connections tightness. Additionally a calculation example regarding flange connection according to ASME VIIIDIV 1 requirement and then detailed Finite Element Analysis presented; impact of nonlinear material properties (gasket loading unloading curves) on the connection tightness for complex loading programme is shown. It is finally concluded that in addition to usual design calculations more precise calculation is needed to fully verify behaviour of sealed connection at complex extreme variable loadings. Material aspect is very important at designing, testing, service and maintenance; taking it into consideration may avoid many problems related to safe exploitation.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1409-1416
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Phase Diagrams of Ashkin-Teller Model
    Autorzy:
    Pawlicki, P.
    Kamieniarz, G.
    Kozlowski, P.
    Dekeyser, R.
    Rogiers, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964805.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Mg
    75.10.Hk
    64.60.Ak
    Opis:
    The phase diagram of the Askhin-Teller model in two dimensions is determined. Numerical calculations are performed for the simple square L × L lattice using transfer matrix technique. Exploiting finite-size scaling all unknown critical lines were obtained with good accuracy. An extended version of the Ashkin-Teller model is also considered within the molecular field renormalization group method and the critical surface for three-parameter odd-parity Hamiltonian is calculated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 453-456
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-penetrating very deep sclerectomy with a hydrophobic polymer implant in a rabbit model
    Autorzy:
    Leszczyński, R.
    Stodolak-Zych, E.
    Gumuła, T.
    Wieczorek, J.
    Kosenyuk, Y.
    Pawlicki, K.
    Błażewicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/307465.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    jaskra
    polimery
    biomateriały
    NPVDS
    glaucoma
    biocompatible polymers
    polymer membranes
    non-penetrating very deep sclerectomy
    rabbit model
    Opis:
    Purpose: The aim of the study was to evaluate the influence of an implant made of a terpolymer (PTFE-PVDF-PP) on the condition of rabbit eyes during a one year observation period. Methods: The implant in the shape of an equilateral triangle (3 mm side length) was manufactured from a thin hydrophobic porous membrane. There were evaluated 40 eyes of 20 rabbits. The animals had non-penetrating very deep sclerectomy (NPVDS) performed, with insertion of an implant in the form of a triangular thin membrane. The control group consisted of 20 eyes where the animals had NPVDS performed without implant insertion. The evaluations included the study of the anterior part of the eye together with photographic documentation. Histopathological examination of the eyes 52 weeks after NPVDS procedure has been made. The process of wound healing was comparable in both groups. Results: The evaluation of the rabbits did not reveal any acute process of intraocular inflammation. After 12 month period of observation, no statistically significant differences in the process of wound healing or status of eyes were found between the groups. An analysis of fibrous connective tissue attachment to the implant showed that its layer was not thick and did not differ significantly from the control. The procedure of very deep sclerectomy and insertion of a polymer implant were well tolerated by the rabbit eyes. Conclusions: The in vivo results indicate that the hydrophobic implant in the form of a membrane can serve as a sclera implant after further study.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 23-31
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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