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    Wyświetlanie 1-15 z 15
    Tytuł:
    Structure and Properties of Ni/Diamond Nanocrystalline Coatings
    Autorzy:
    Mazurek, A.
    Trzaska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/350997.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diamond
    nickel/diamond
    composite coatings
    Opis:
    This paper presents the results of research of Ni/diamond composite coatings produced by electrochemical reduction method. Research was focused on composite coatings with nickel matrix and diamond as a disperse phase and for comparison purposes on nanocrystalline nickel coatings. Ni/diamond composite coatings were produced in baths with different content of nanodiamond powder. The structures of the dispersed phase and the composite coatings were analysed by using X-ray diffraction, scanning electron microscopy and light microscopy. Measurements of selected properties of the coatings were performed, including roughness, microhardness, adhesion and abrasive wear resistance. The research results indicate that the produced coatings have a compact structure and good adherence to steel substrate. Moreover, nanocrystalline Ni/diamond composite coatings exhibit greater hardness and reduced abrasive wear resistance compared to nanocrystalline nickel coatings.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1309-1314
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structuring role of F-T synthetic wax in bitumen
    Autorzy:
    Iwański, M.
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/202273.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bitumen
    synthetic wax F-T
    ductility
    rheology
    morphology
    group type
    Opis:
    The reduction in asphalt mixture production and placement temperatures can be achieved by modifying bitumen 35/50 with the Fischer-Tropsch synthetic wax. To identify the role this modifier plays in the bitumen 35/50, a series of tests has been performed. The experiment was carried out for wax doses from 1.5% to 4.0%. Analysis of the modified binder properties such as ductility at 5, 15 and 25◦C, complex modulus G* with the parameter G*/sinx and LSV, susceptibility according to MSCR procedure, morphology and group type analysis helped describe the structuring function of the F-T wax in the binder. The optimum F-T wax content of 2.5% has been identified to provide the desired parameters required for modified binders.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 525-534
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of F-T synthetic wax on asphalt concrete permanent deformation
    Autorzy:
    Iwański, M.
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/230591.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton asfaltowy
    wosk syntetyczny F-T
    odkształcenie trwałe
    moduł sztywności
    odporność na koleinowanie
    zmęczenie
    asphalt concrete
    F-T synthetic wax
    permanent deformation
    stiffness modulus
    resistance to rutting
    fatigue
    Opis:
    The paper presents the results of the study of the effect of a Fischer-Tropsch (F-T) synthetic wax on the resistance to permanent deformation of the AC 11S asphalt concrete. The synthetic wax was dosed at 1.5%, 2.5% and 3.5% by weight of bitumen 35/50. The compaction temperatures were 115ºC, 130ºC and 145ºC. The criteria adopted for measuring the resistance to permanent deformation included the following parameters: stiffness modulus at 2, 10 and 20ºC, permanent deformation (RTS), fatigue life determined using the indirect tensile fatigue test (ITFT) and resistance to rutting (WTSAIR, PRDAIR). The test results confirmed the positive influence of F-T synthetic wax on enhancing the permanent deformation resistance of asphalt concrete placed at lower compaction temperatures compared to that of standard asphalt concrete compacted at 140ºC.
    Źródło:
    Archives of Civil Engineering; 2013, 59, 3; 295-312
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of selected properties of asphalt concrete with synthetic wax
    Autorzy:
    Mazurek, G.
    Iwański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202091.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    initial yield strength
    synthetic wax
    Prony Series
    pseudo-strain
    viscoplastic deformation
    granica plastyczności
    wosk syntetyczny
    szereg Prony
    Opis:
    This article discusses the issue of viscoplastic deformation that usually occurs in road pavements, especially in the summer season in Poland. The evaluation of viscoplastic deformations was performed on the example of the asphalt concrete designated for the binding course layer (AC16W). Additionally, the bitumen used for manufacturing asphalt concrete samples was modified with two types of synthetic waxes widely applied in the warm mix asphalt technology. These waxes varied in molecular weight, which affected their softening point results. Before decomposition of the total strain into elastic and viscoplastic part, oscillatory tests in the linear viscoelastic region were required. The generalized Maxwell model was used to describe the behavior of asphalt concrete in the linear viscoelastic range. Using the elasto-viscoelastic correspondence principle, described by Schapery, the initial yield strength stress was evaluated. The pseudostrain variable turned out to be useful for estimating the onset of viscoplastic strains occurring in road pavement. Such engineering procedure approach could result in faster approximation of the yield strength level during the design of pavement structures. It will also allow for differentiation of mixtures in terms of their susceptibility to permanent deformation and of their sensitivity to traffic induced overloading.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 217-228
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen
    Autorzy:
    Iwański, M.
    Buczyński, P.
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/200980.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gabbro dust
    cold recycling technology
    foamed bitumen
    road base course
    pył
    gabro
    technologia recyklingu na zimno
    bitumen
    Opis:
    Mineral fines are a waste product of aggregate production in quarries and asphalt mixing plants. The incorporation of mineral gabbro dust into foam bitumen causes developing of a mesh reinforcement in the recycled base mixture. This mesh reinforcement, observed in a recycled base structure, induces an increase in stiffness modulus, where its elastic part of complex modulus dominates over the imaginary part. Therefore, it is possible to create a recycled mixture with a lower susceptibility to loading time/temperature. In result, the presence of gabbro dust in recycled mixture limits the magnitude of strains induced by the traffic load. This paper presents the results of the tests carried out on the mineral dusts derived from gabbro rock. Structural and functional properties of the fines were determined to prepare their characteristics. Then, the cold recycled mixtures for the road base were designed with the 5–20% mineral fines content. The mixtures were prepared in cold recycling technology with foamed bitumen. Further tests involved determining mechanical and physical properties of the recycled mixes, including air voids content, Marshall stability, Marshall quotient (stiffness), indirect tensile strength and stiffness modulus at 20°C). The results indicated a positive influence of the gabbro dusts on the investigated parameters. With the use of ANOVA tests, the significance of the influence of the gabbro dust and foamed bitumen on these properties was evaluated. Harrington’s multicriteria method was employed to establish gabbro dust and foamed bitumen amounts, the addition of which would guarantee optimal properties of the recycled base mixture.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 763-773
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects of the biology of the European corn borer [Ostrinia nubilalis Hbn.] on sweet corn
    Wybrane elementy z biologii omacnicy prosowianki [Ostrinia nubilalis Hbn.] na kukurydzy cukrowej
    Autorzy:
    Mazurek, J
    Hurej, M.
    Jackowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/66418.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biology
    European corn borer
    Ostrinia nubilalis
    sweet corn
    egg laying
    larva
    migration
    cob
    damage
    Źródło:
    Journal of Plant Protection Research; 2003, 43, 4; 345-352
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Viral infections of Apis mellifera : its importance, dynamics, diagnostics and treatment opportunities
    Autorzy:
    Matusiewicz, M.
    Margas, E.
    Mazurek, M.P.
    Wesolowska, L.
    Belter, A.
    Skupinska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/81183.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2016, 97, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Między inwigilacją a uwiedzeniem. Użytkownicy Internetu wobec praktyk gromadzenia i przetwarzania danych
    Between Invigilation and Seduction. Internet Users and Practices of Gathering and Processing Data
    Autorzy:
    Mazurek, P.
    Zając, J.M.
    Rakocy, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2137843.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    privacy
    invigilation
    digital surveillance
    data processing
    personal data
    Internet users
    computer use competences
    prywatność
    inwigilacja
    cyfrowy nadzór
    przetwarzanie danych
    dane osobowe
    użytkowanie Internetu
    kompetencje korzystania z komputera
    Opis:
    The article concerns social aspects of gathering and processing data recorded on line. Changes in the forms of control enabled by the development of microelectronics and information and telecommunication technologies are the context of the analysis. The specific issues of the social space of the Internet include: possibilities to gather and process data regarding user's behaviour, processes of matching content with individual's profile, threats of spyware, and emergence of the political movement of privacy protection. Additionally, there is a brief review of hitherto empirical research on privacy and digital surveillance.
    Artykuł poświęcony jest społecznym aspektom gromadzenia i przetwarzania danych w Internecie, w tym danych osobowych. Analiza tego zjawiska poprzedzona jest omówieniem szerszego kontekstu, jakim są przemiany form kontroli umożliwione przez rozwój mikroelektroniki i technologii teleinformacyjnych. Przedstawiona jest specyfika techniczno-społecznej przestrzeni internetowej i jej charakterystyczne cechy: łatwość gromadzenia i przetwarzania danych o poczynaniach internautów, możliwość dostosowania zawartości do profilu użytkownika, funkcjonowanie oprogramowania szpiegującego [spyware] oraz pojawienie się politycznego ruchu na rzecz obrony prywatności. Praca zawiera także krótki przegląd dotychczasowych badań empirycznych, zarówno zagranicznych, jak i polskich.
    Źródło:
    Studia Socjologiczne; 2007, 3(186); 145-167
    0039-3371
    Pojawia się w:
    Studia Socjologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Principles of Feeding Systems Design: Simulation vs Industrial Experience
    Autorzy:
    Perzyk, M.
    Kochański, A.
    Mazurek, P.
    Karczewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379595.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    simulation software
    feeding flow
    krzepnięcie
    wady odlewów
    przepływ
    oprogramowanie
    Opis:
    Simulation software dedicated for design of casting processes is usually tested and calibrated by comparisons of shrinkage defects distribution predicted by the modelling with that observed in real castings produced in a given foundry. However, a large amount of expertise obtained from different foundries, including especially made experiments, is available from literature, in the form of recommendations for design of the rigging systems. This kind of information can be also used for assessment of the simulation predictions. In the present work two parameters used in the design of feeding systems are considered: feeding ranges in horizontal and vertical plates as well as efficiency (yield) of feeders of various shapes. The simulation tests were conducted using especially designed steel and aluminium castings with risers and a commercial FDM based software. It was found that the simulations cannot predict appearance of shrinkage porosity in horizontal and vertical plates of even cross-sections which would mean, that the feeding ranges are practically unlimited. The yield of all types of feeders obtained from the simulations appeared to be much higher than that reported in the literature. It can be concluded that the feeding flow modelling included in the tested software does not reflect phenomena responsible for the feeding processes in real castings properly. Further tests, with different types of software and more fundamental studies on the feeding process modelling would be desirable.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 77-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of parameters for a design of the stable electro-dynamic passive magnetic support of a high-speed flexible rotor
    Autorzy:
    Szolc, T.
    Falkowski, F.
    Henzel, M.
    Kurnyta-Mazurek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201250.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotor dynamics
    electrodynamic passive magnetic bearings
    active magnetic damper
    stability analysis
    rotor- shaft system
    dynamika rotora
    wirnik
    amortyzator magnetyczny
    analiza stabilności
    pasywne łożysko magnetyczne
    Opis:
    Electro-dynamic passive magnetic bearings are now viewed as a feasible option when looking for support for high-speed rotors. Nevertheless, because of the skew-symmetrical visco-elastic properties of such bearings, they are prone to operational instability. In order to avoid this, the paper proposes the addition of external damping into the newly designed vibrating laboratory rotor-shaft system. This may be achieved by means of using simple passive dampers that would be found among the components of the electro-dynamic bearing housings along with magnetic dampers, which satisfy the operational principles of active magnetic bearings. Theoretical investigations are going to be conducted by means of a structural computer model of the rotor-shaft under construction, which will take into consideration its actual dimensions and material properties. The additional damping magnitudes required to stabilize the most sensitive lateral eigenmodes of the object under consideration have been determined by means of the Routh-Hurwitz stability criterion.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 91-105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concentration levels of cadmium and lead in the raw and processed meat of Helix pomatia snails
    Autorzy:
    Ziomek, M.
    Drozd, Ł.
    Chałabis-Mazurek, A.
    Szkucik, K.
    Paszkiewicz, W.
    Valverde Piedra, J. L.
    Bełkot, Z.
    Maćkowiak-Dryka, M.
    Gondek, M.
    Knysz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087661.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cadmium
    lead
    GFAAS
    snail meat
    Helix pomatia
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 3; 483-489
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clinical course of granulocytic anaplasmosis in hunting dogs
    Autorzy:
    Teodorowski, O.
    Winiarczyk, S.
    Debiak, P.
    Skrzypczak, M.
    Mazurek, Ł.
    Adaszek, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087166.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Anaplasma phagocytophilum
    hunting dog
    vector-borne disease
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 2; 175-181
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Heat Treatment on Properties of Ni-B/B Composite Coatings
    Autorzy:
    Mazurek, A.
    Bartoszek, W.
    Cieślak, G.
    Gajewska-Midziałek, A.
    Oleszak, D.
    Trzaska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352856.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-B/B composite coating
    Ni-B alloy coating
    boron powder
    heat treatment
    Opis:
    The results of research on preparations of alloy Ni-B/B composite coatings produced by chemical reduction method on a carbon steel substrate are collected in this paper. The alloy Ni-B coatings were also investigated for comparative purposes. The produced coatings were subjected to a heat treatment process. The boron powder with the particles size below 1 μm was used as the dispersion phase. The structure of the coatings was examined by X-ray diffraction method. Boron powder particles as well as surface morphology and topography were characterized by scanning electron microscopy. The roughness test, microhardness and corrosion resistance by potentiodynamic method and surface wettability tests were carried out. Analysis of the chemical composi-tion by the EDS method showed that the boron powder particles were evenly embedded in the entire volume of the coating. Ni-B/Bcomposite coatings are characterized by higher hardness than alloy Ni-B coatings. As a result of heat treatment, the Ni3 B phase crystallized, which increased the hardness of the coating material. The incorporation of boron powder particles and heat treatment reduce the corrosion resistance of coatings. All produced coatings exhibited hydrophobic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 839-844
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study
    Autorzy:
    Jartych, E.
    Pikula, T.
    Mazurek, M.
    Franus, W.
    Lisinska-Czekaj, A.
    Czekaj, D.
    Oleszak, D.
    Surowiec, Z.
    Aksenczuk, A.
    Calka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/352172.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Aurivillius compounds
    sintering
    mechanical activation
    magnetic properties
    Opis:
    Three different methods were used to obtain Bi5Ti3FeO15 ceramics, i.e. solid-state sintering, mechanical activation (MA) with subsequent thermal treatment, and electrical discharge assisted mechanical milling (EDAMM). The structure and magnetic properties of producedBi5Ti3FeO15 samples were characterized using X-ray diffraction and Mössbauer spectroscopy. The purest Bi5Ti3FeO15 ceramics was obtained by standard solid-state sintering method. Mechanical milling methods are attractive because the Bi5Ti3FeO15 compound may be formed at lower temperature or without subsequent thermal treatment. In the case of EDAMM process also the time of processing is significantly shorter in comparison with solid-state sintering method. As revealed by Mössbauer spectroscopy, at room temperature theBi5Ti3FeO15 ceramics produced by various methods is in paramagnetic state.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 869-874
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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