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Wyszukujesz frazę "Dobrzyński, M. D." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    The effect of alternative cutter paths on flatness deviations in the face milling of aluminum plate parts
    Autorzy:
    Dobrzynski, M.
    Chuchala, D.
    Orlowski, K. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/99859.pdf
    Data publikacji:
    2018
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    process precision
    face milling
    radiator
    paths strategies
    flatness deviation
    Opis:
    In this paper the relationships between the alternative machining paths and flatness deviations of the aluminum plate part, were presented. The flatness tolerance of the main surface of the plate part has crucial meaning due to the assembly requirement of piezoelectric elements on the radiator. The aluminum bodies under investigation are the base part of the radiators with crimped feathers for the train industry. The surface of the aluminum plate part was milled using three different milling strategies: along of longer or shorter side of workpiece and at an angle of 45°. The aluminum bodies were machined on milling centre ecoMILL 70 DMG MORI. The flatness deviation measurements were carried out on the Coordinated Measuring Machine Altera 7.5.5 Nikon Metrology NV. These measurements were made during the manufacturing process of the radiator, namely after machining, however, before the process crimping of feathers. The results that were obtained enables the validation of assumed milling path strategies in connection of the subsequent machining and assembly processes.
    Źródło:
    Journal of Machine Engineering; 2018, 18, 1; 80-87
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Rapid Prototyping technology in the manufacturing of turbine blade with small diameter holes
    Autorzy:
    Deja, M.
    Dobrzyński, M.
    Flaszyński, P.
    Haras, J.
    Zieliński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/259963.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    turbine blade
    small diameter holes
    Rapid Prototyping/Rapid Manufacturing
    Direct Metal Laser Sintering (DMLS) technology
    Opis:
    The article presents the possibilities++ of using Rapid Prototyping (RP) technology in the manufacturing of turbine blades with small diameter holes. The object under investigation was gas turbine blade with small diameter cooling holes and holes for generating longitudinal vortices. A turbine blade model was produced by means of Direct Metal Laser Sintering (DMLS) technology and subsequently validated in terms of detection and accuracy of the obtained holes. The application of the computer tomography and digital radiography technique resulted in obtaining a series of cross-sections of the turbine blade model with a series of holes. Particular attention was pointed out at the investigation of the locations of micro-holes with a diameter of 0.3 mm. It turned out that it was impossible to make such small holes by the RP method. In the following part the results of the study on the possibilities of making the micro-holes using electrical discharge method have been presented. In addition, proposition of further works such as the development of the considerations and issues discussed in this article, has been offered.
    Źródło:
    Polish Maritime Research; 2018, S 1; 119-123
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Bayesian Reasoning and the Maximum Entropy Method to Some Reconstruction Problems
    Autorzy:
    Fornalski, K.
    Parzych, G.
    Pylak, M.
    Satuła, D.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537660.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.85.-c
    78.70.Bj
    76.80.+y
    Opis:
    The so-called Bayesian reasoning is applied whenever uncertainty has to be considered as serious factor in interpretation of results. The paper presents analysis of the impact of inaccurate data on the straight line and quadratic relation fittings. This type of analysis is particularly important when one tries to decide on the type of dependence. The paper also shows examples of the Maximum Entropy Methods applied to the reconstruction of the hyperfine parameters distribution from the measured Mössbauer spectra of $GaFeO_{3}$ and the electron-positron momentum distribution from the positron annihilation data of Gd.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 892-899
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacturing and characterization of resorbable PLGA membranes for biomedical applications
    Autorzy:
    Krok, M.
    Ferreira, C.
    Fernandes, S.
    Kościelniak, D.
    Dobrzyński, P.
    Pamuła, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/284710.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    PLGA
    PEG
    porous membrane
    phase-separation method
    GTR
    Opis:
    Porous poly(L-lactide-co-glycolide) (PLGA) membranes were prepared by solvent-casting/porogen leaching method. Poly(ethylene-glycol) (PEG) with two molecular weights was used as a pore former. Mechanical properties of the membranes were analyzed in tensile test. Topography, pore size and surface roughness were characterized by atomic force microscopy on both sites of the membranes. PEG leached out percentage, thickness and wettability were also measured. Osteoblast-like cells were cultured on the membranes for 24 h and 6 days, and morphology, distribution and number of adhered cells as well as secretion of proteins and nitric oxide were measured. The results show that PEG molecular weight affected size and distribution of pores on both surfaces of the membranes. It resulted also in different mechanical characteristics of the membranes. In vitro experiments show that the membranes support adhesion and growth of osteoblast-like cells suggesting their usefulness for guided tissue regeneration (GTR).
    Źródło:
    Engineering of Biomaterials; 2011, 14, 104; 8-13
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealing in Multicomponent bcc Alloys
    Autorzy:
    Szymański, K.
    Perzyńska, K.
    Satuła, D.
    Dobrzyński, L.
    Zaleski, P.
    Waliszewski, J.
    Rećko, K.
    Biernacka, M.
    Olszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506614.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    76.80.+y
    61.05.Qr
    61.50.Ks
    81.30.Hd
    Opis:
    Multicomponent single phase alloys were synthesized according to the idea of iron-average atom system. X-ray diffraction shows formation of bcc phase and traces of unidentified phase. Mössbauer spectra indicate presence of two components with different hyperfine magnetic field distributions. The high field component corresponds to the majority ferromagnetic phase. Few per cent of iron builds low field component. The dominant effect of annealing consists in an increase of the low field component.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 62-64
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    One step 3D printing of surface functionalized composite scaffolds for tissue engineering applications
    Autorzy:
    Kotlarz, M.
    Jordan, R.
    Wegner, E.
    Dobrzyński, P.
    Neunzehn, J.
    Lederer, A.
    Wolf-Brandstetter, C.
    Pamula, E.
    Scharnweber, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/306484.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    druk 3D
    PLGA
    węglan wapnia
    właściwości powierzchniowe
    3D printing
    calcium carbonate
    amphiphilic poly(2-oxazoline)
    degradation
    surface properties
    Opis:
    A successful approach widely used in materials science to adapt approved materials to specific applications is to design their surface properties. A main challenge in this area is the development of processing routes enabling for a simple but efficient surface design of complex shaped geometries. Against this background, this work aimed at the implementation of self-assembly principles for surface functionalization of 3D-printed poly(lactic-co-glycolic acid) (PLGA)-based constructs with macro- and microporous geometries via precision extruding deposition. Methods: Three-component melts from PLGA, CaCO3 and amphiphilic polymers (poly(2-oxazoline) block copolymer) were printed and their bulk and surface properties were studied. Results: Melts with up to 30 mass % of CaCO3 could be successfully printed with homogeneously distributed mineral particles. PLGA degradation during the printing process was temperature and time dependent: the molecular weight reached 10 to 15% of the initial values after ca. 120 min of heat exposure. Filament surfaces from melts containing CaCO3 show an increasing microroughness along with increasing CaCO3 content. Surface roughness and amphiphilic polymer content improve scaffold wettability with both factors showing synergistic effects. The CaCO3 content of the melts affected the inner filament structure during in vitro degradation in PBS, resulting in a homogeneous mineral particle-associated microporosity for mineral contents of 20 mass % and above. Conclusions: These results provide novel insights into the behavior of three-component melts from PLGA, CaCO3 and amphiphilic polymers during precision extruding deposition and show for the first time that self-assembly processes can be used to tailor scaffolds surface properties under such processing conditions.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 35-45
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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