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    Wyświetlanie 1-6 z 6
    Tytuł:
    Corrosion behaviour of polished and sandblasted titanium alloys in PBS solution
    Autorzy:
    Burnat, B.
    Walkowiak-Przybyło, M.
    Błaszczyk, T.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/306724.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    corrosion
    PBS solution
    polishing
    sandblasting
    titanium alloys
    korozja
    stop tytanu
    piaskowanie
    Opis:
    In this work, we performed comparative studies of the effect of surface preparation of Ti6Al4V and Ti6Al7Nb biomedical alloys and the influence of endothelial cells on their corrosion behaviour in PBS (Phosphate Buffered Saline). Two different methods of surface modification were applied – polishing and sandblasting. The polished Ti6Al7Nb alloy was found to have the best resistance against general corrosion in PBS. It was characterized by the lowest corrosion rate, the widest passive range and the lowest reactivity. Both alloys prepared by sandblasting exhibited worse corrosion properties in comparison to the polished ones. This can be associated with a greater development of their surface and the presence of Al2O3 grains which caused an increase of corrosion potential but might also influence the weakening of the passive layer. Results of potentiodynamic anodic polarization indicated that more resistant to pitting corrosion was Ti6Al7Nb alloy regardless of the method of surface preparation. In those cases, anodic polarization caused only an increase of passive layer, while in the case of sandblasted Ti6Al4V alloy it caused a pitting corrosion. The results obtained allowed us to conclude that the niobium-titanium alloys had higher corrosion resistance than titanium alloys with vanadium. Moreover, it was stated that endothelial cells improved the corrosion resistance of all the titanium alloys examined.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 87-94
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biofilm formation under anaerobic conditions on biomaterial’s surface
    Autorzy:
    Jakubowski, W.
    Biela, T.
    Kamińska, M.
    Walkowiak-Przybyło, M.
    Walkowiak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/284942.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    biofilms
    surface
    biomaterials
    Opis:
    Investigations of the biofilm formation processes on biomaterials surfaces are focused on typical physiologic conditions - aerobic condition. In experimental works onto model strains, and also in the clinical reports there is a lack of the information related to the mechanisms engaged in biofilm grown under conditions of limited access to oxygen or in entirely anaerobic environment. Presented results show the colonization of medical steel 316L surface and creation of biofilm structures by E. coli bacteria’s, under oxygen deficit conditions or its total lack. In studied arrangement the change of the dynamics of bacterium growth was observed, which led to considerable slowdown of the biofilm development. Bacteria were observed with use of the combination of fluorescent dyes - bis-benzimide and propidium iodide – which makes it possible the distinction of live/death bacteria. In oxygen deficiency and in anaerobic conditions multiplication of death bacteria level in comparison to standard conditions was observed (suitably 34% and 41% dead cells, oxygenic conditions - 1%). The limitation of oxygen utilization possibility by the bacteria, which colonized investigated surfaces also resulted in decreased sizes reached by the cells.
    Źródło:
    Engineering of Biomaterials; 2009, 12, no. 89-91; 254
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of metal surfaces coated with europium-doped titanium dioxide by laser induced breakdown spectroscopy
    Autorzy:
    Głogocka, D.
    Noculak, A.
    Pucińska, J.
    Jopek, W.
    Podbielska, H.
    Langner, M.
    Przybyło, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306866.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    europ
    tytan
    LIBS
    jakość
    kompozycja
    cienkie warstwy
    europium
    titanum
    quality
    composition
    thin layers
    Opis:
    The surface passivation with titanium sol-gel coatings is a frequently used technique to control the adsorption of selected biological macromolecules and to reduce the exposure of the bulk material to biological matter. Due to the increasing number of new coating-preparation methods and new gel compositions with various types of additives, the quality and homogeneity determination of the surface covering is a critical factor affecting performance of any implanted material. While coating thickness is easy to determine, the homogeneity of the surface distribution of coating materials requires more elaborate methodologies. In the paper, the laser induced breakdown spectroscopy (LIBS) based method, capable to quantitate the homogeneity and uniformity of the europium in titanium dioxide sol-gel coatings on stainless steel surfaces prepared with two different procedures: spin-coating and dip-coating, is presented. The emission intensity of titanium has been used to determine the coating thickness whereas the relative values of europium and titanium emission intensities provide data on the coating homogeneity. The obtained results show that the spin-coating technique provides better surface coverage with titanium dioxide. However, when the surface coating compositions were compared the dip-coating technique was more reliable.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 33-40
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distant Measurement of Plethysmographic Signal in Various Lighting Conditions Using Configurable Frame-Rate Camera
    Autorzy:
    Przybyło, J.
    Kańtoch, E.
    Jabłoński, M.
    Augustyniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221113.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photoplethysmography
    remote patient monitoring
    heart rate detection
    video signal processing
    Opis:
    Videoplethysmography is currently recognized as a promising noninvasive heart rate measurement method advantageous for ubiquitous monitoring of humans in natural living conditions. Although the method is considered for application in several areas including telemedicine, sports and assisted living, its dependence on lighting conditions and camera performance is still not investigated enough. In this paper we report on research of various image acquisition aspects including the lighting spectrum, frame rate and compression. In the experimental part, we recorded five video sequences in various lighting conditions (fluorescent artificial light, dim daylight, infrared light, incandescent light bulb) using a programmable frame rate camera and a pulse oximeter as the reference. For a video sequence-based heart rate measurement we implemented a pulse detection algorithm based on the power spectral density, estimated using Welch’s technique. The results showed that lighting conditions and selected video camera settings including compression and the sampling frequency influence the heart rate detection accuracy. The average heart rate error also varies from 0.35 beats per minute (bpm) for fluorescent light to 6.6 bpm for dim daylight.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 4; 579-592
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salt tectonics in front of the Outer Carpathian thrust wedge in the Wieliczka area (S Poland) and its exposure in the underground salt mine
    Autorzy:
    Burliga, S.
    Krzywiec, P.
    Dąbroś, K.
    Przybyło, J.
    Włodarczyk, E.
    Źróbek, M.
    Słotwiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184289.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Carpathian Foredeep
    Miocene
    salt tectonics
    Wieliczka salt deposit
    Opis:
    Salt deposits in the Wieliczka area (Wieliczka Salt Deposit – WSD) in southern Poland comprise salt-rich strata belonging to an evaporite succession that originated in the Carpathian Foredeep basin in the Middle Miocene Badenian (Serravallian) times, ca 13.81–13.45 Ma. Although they have been mined since the 13th century and decades of investigations provided abundant data on their origin and structure, some aspects of their geological evolution are still not fully understood. This study presents current concepts on the lithostratigraphy and tectonics of the WSD. The salt-bearing facies developed near to the southern basin margin, delineated by the Carpathian orogenic front. Such a location triggered the redeposition of sediments and gravity-driven deformation followed by tectonic deformation related to the forelandward advancement of the Carpathian thrusts. As a result, the WSD consists of folds and slices composed of two main salt members: (1) the stratified salt member, with intercalating salt, sulphates and siliciclastics, and (2) the boulder salt member, built of clays with large, isolated blocks of salt. The stratified member contains abundant meso-scale tectonic structures recording the soft-sediment deformation and deformation related to the northward tectonic push exerted by the advancing Carpathian thrust wedge. The boulder member originated due to the syntectonic erosion of evaporites along the basin margins and their redeposition during progressive northward migration of the Carpathian front. Recent interpretations of seismic data imply that the WSD constitutes the core of a triangle zone developed at the contact of the Carpathian orogenic wedge with the backthrust-displaced foredeep sedimentary fill. Meso-scale examples of sedimentary and tectonic structures in the salt-bearing succession exposed in the underground Wieliczka Salt Mine are described and their formation modes discussed.
    Źródło:
    Geology, Geophysics and Environment; 2018, 44, 1; 71-90
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Model-Based Design in algorithms’ prototyping for experimental acorn scarification rig
    Zastosowanie metodyki projektowania opartej na modelu w prototypowaniu algorytmów dla badawczego stanowiska skaryfikacji żołędzi
    Autorzy:
    Przybyło, J.
    Jabłoński, M.
    Pociecha, D.
    Tadeusiewicz, R.
    Piłat, A.
    Walczyk, J.
    Kiełbasa, P.
    Szczepaniak, J.
    Adamczyk, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/335729.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    scarification
    acorn
    Model-Based Design
    control
    skaryfikacja
    żołędzie
    projektowanie
    model MBD
    sterowanie
    Opis:
    Assessment of viability of oak seeds is mainly performed by mechanical scarification followed by visual assessment by trained employees. This procedure is slow and prone to human errors, thus automation of this process is desirable. Shortening the design of complex automation systems requires the use of modern methods, allowing for modeling and simulation of systems containing elements of mechanical, electrical and digital components. The article presents selected aspects of the design of control algorithms for the acorn scarification prototype. A virtual prototyping and Model-Based Design (MBD) approach have been used.
    Jedną ze stosowanych metod badania zmian mumifikacyjnych nasion jest skaryfikacja mechaniczna, połączona ze wzrokową oceną żywotności nasion przez człowieka. Ręcznie wykonywana procedura jest powolna i podatna na błędy, dlatego też automatyzacja tego procesu jest pożądana. Skrócenie czasu projektowania złożonych systemów automatyki wymaga stosowania nowoczesnych metod, pozwalających na modelowanie i symulację systemów zawierających elementy zarówno mechaniczne, elektryczne, jak i podzespoły cyfrowe. W artykule zaprezentowano wybrane aspekty projektowania algorytmów sterujących stanowiska badawczego do skaryfikacji żołędzi. Do rozwoju stanowiska badawczego wykorzystano wirtualne prototypowanie oraz metodykę projektowania opartą na modelu (MBD - ang. Model-Based Design).
    Źródło:
    Journal of Research and Applications in Agricultural Engineering; 2017, 62, 1; 166-170
    1642-686X
    2719-423X
    Pojawia się w:
    Journal of Research and Applications in Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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