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    Wyświetlanie 1-8 z 8
    Tytuł:
    3D model of anodic oxide coating modified with carbon particles
    Model 3D warstwy tlenkowej modyfikowanej cząstkami grafitu
    Autorzy:
    Służałek, G.
    Wistuba, H.
    Kubica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/328031.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    anodowa warstwa tlenkowa
    model 3D
    CAD
    trzpień-tarcza
    cząsteczki grafitu
    anodic oxide coating
    carbon particles
    3D model
    pin-on-disc
    Opis:
    In this paper shown three-dimensional model of composite hard anodic layer modified by carbon particles. Modifications were carried by vacuum sublimation by a graphite electrode. The modified layer is characterized by improved tribological properties (friction coefficient) compared to the unmodified layer. Test conditions and values of the coefficients of friction are presented for the combination of pin-on-disc pair in T-01M tester. The 3D model was made in parametric CAD program Solid Edge v19 pl, which allows to explain the decrease in the coefficient of friction.
    W pracy przedstawiono trójwymiarowy model kompozytowej warstwy ceramiczno-grafitowej powstałej w wyniku modyfikowania anodowej powłoki twardej. Modyfikacje przeprowadzono w procesie napylania próżniowego. Warstwa modyfikowana charakteryzuje się lepszymi właściwościami tribologicznymi (współczynnik tarcia) w porównaniu do warstwy niemodyfikowanej. Warunki badań oraz wartości współczynników tarcia zestawiono dla skojarzenia trzpień-tarcza testera T-01M. Model 3D warstwy wykonano w parametrycznym programie CAD Solid Edge v19, który pozawala na wyjaśnienie zmniejszenia się współczynnika tarcia.
    Źródło:
    Diagnostyka; 2011, 3(59); 61-64
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Delta13C of organic atmospheric dust deposited in Wrocław (SW Poland): critical remarks on the passive method
    Autorzy:
    Górka, M.
    Jędrysek, M. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060221.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    solid organic atmospheric particles
    carbon isotopes
    Opis:
    This paper reports the results of the application of passive collectors to the collection of solid organic atmospheric particles (SOAP) in Wrocław (SW Poland) to carry out stable carbon isotope analyses. delta exp.13C (SOAP) values collected during the vegetation-free period, from November to March, vary in a narrow range from -24.5 to -27.8‰. We show that d13C (SOAP) is able to provide information about atmospheric pollution with respect to different emission sources. delta exp.13C (SOAP) values collected during the period of vegetation growth, from April to October, show a wide range from -20.5 to -26.9‰. The most probable explanations for the 13C- enriched values in summer are that: (i) the SOAP have been contaminated with fresh and decomposed organic matter in the passive collector and/or (ii) SOAP are derived from out side the city or from out side Poland (C4 plant particles). There fore, the d13C (SOAP) may not represent a strictly anthropogenic im pact. The passive collector method for the (SOAP) collection should be applied only in areas with dry deposition of atmospheric dust where deposited organic matter is not de composed in the water contained in collectors. We recommend the use of active sampling methods (hi-volume sampler) to collect SOAP use ful for carbon isotope analyses.
    Źródło:
    Geological Quarterly; 2008, 52, 2; 115-115
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A facile approach for the fabrication of superhydrophobic surface with candle smoke particles
    Autorzy:
    Qin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/109871.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    superhydrophobicity
    carbon
    candle smoke particles
    calcination
    Opis:
    The aim of this communication is to explore a simple and efficient method for fabrication of superhydrophobic surface by candle smoke particles (CSPs). The properties of CSPs before and after the calcination process has been studied by SEM, TEM, TG-DSC, FT-IR and contact angle measurements. The results show that there is a complex mixture of elemental carbon and a variety of hydrocarbons in association with amorphous nanomaterial in CSPs, whose structure and composition leads to superhydrophobic properties. The wetting properties of CSPs can turn from superhydrophobic into superhydrophilic due to characteristic group changes by calcination process. Thus, it is a simple and efficient method to fabricate superhydrophobic or superhydrophilic surface by CSPs at low cost.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 501-510
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organosolv lignin particles as an ecological reagent in the Kupfershiefer copper ore flotation
    Autorzy:
    Witecki, Kajetan
    Szkurat, Monika
    Hruzova, Katerina
    Powiązania:
    https://bibliotekanauki.pl/articles/27323665.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    collector
    particles
    total organic carbon
    organosolv
    lignin
    Opis:
    Mineral separation relies heavily on the process of flotation. This study explored the feasibility of using organosolv lignin nanoparticles and microparticles (OLP) as a greener alternative to xanthates in the flotation process for mineral separation. Xanthates are widely used but pose environmental and health risks. The efficiency of OLP as collectors was compared to collectorless flotation, resulting in approximately 50% copper recovery, indicating that OLP may not be a suitable replacement for xanthates. Further tests were conducted using a mixture of xanthates and OLP (birch nano and spruce micro) with varying substitution levels (20%, 30%, and 40%). The results demonstrated that increasing the dosage of OLP led to a decrease in flotation efficiency for copper. TOC analysis of the products revealed that high dosages (160 g/t) of birch nano and spruce micro as sole collectors showed beneficiation and selective recovery against copper. While OLPs did not prove effective as collectors, the study highlights their potential as substitutes for maltodextrin in selective flotation of the final concentrate. Two out of four tested OLPs were recommended for pilot scale testing.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174363
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cast Hybrid Composites Designated for Air Compressor Pistons
    Autorzy:
    Dolata, A. J.
    Dyzia, M.
    Jaworska, L.
    Putyra, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356742.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid aluminium composites
    glassy carbon
    graphite particles
    mould casting
    machining
    Opis:
    The main purpose of the investigations was to develop the phase composition of the composite assuming that the component selection criterion will be the formability of piston work surfaces during the machining. Wear resistance under the friction conditions was assumed as the additional parameter for the assessment of composite material. In the study were used AlSi7Mg/SiC+Cg and AlSi7Mg/SiC+GR hybrid composites prepared by the stir casting method.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 705-708
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe-modified activated carbon obtained from biomass as a catalyst for α-pinene autoxidation
    Autorzy:
    Kamińska, Adrianna
    Maciejewska, Nikola
    Miądlicki, Piotr
    Kiełbasa, Karolina
    Sreńscek-Nazzal, Joanna
    Michalkiewicz, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/1849280.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon
    carbonaceous catalysts
    autoxidation
    alpha-pinene
    iron particles
    biomass
    Opis:
    The presented work describes the autoxidation of alpha-pinene for the first time using a catalyst based on activated carbon from biomass with introduced Fe. The raw material for the preparation of the carbon material was waste orange peel, which was activated with a KOH solution. The following instrumental methods characterized the obtained catalyst (Fe/O_AC):N2 adsorption at 77 K, XRD, UV, SEM, TEM, X-ray microanalysis, and catalytic studies. It was shown that the Fe/O_AC catalyst was very active in the autoxidation of alpha-pinene. The main reaction products were: alpha-pinene oxide, verbenone, verbenol, and campholenic aldehyde.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 73-80
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Commercial Kevlar derived activated carbons for CO2 and C2H4 sorption
    Autorzy:
    Kaliszewski, M.
    Zgrzebnicki, M.
    Kałamaga, A.
    Pinjara, S.
    Wróbel, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849281.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon
    carbonaceous catalysts
    autoxidation
    alpha-pinene
    iron particles
    biomass
    Opis:
    The carbonaceous precursor was obtained via pyrolysis of commercial aramid polymer (Kevlar). Additionally the precursor was activated at 1000°C in CO2 atmosphere for different times. Obtained materials were characterised by BET; XPS; SEM and optical microscopy. The sorption capacities were determined by temperature swing adsorption performed in TGA apparatus for CO2 and C2H4 gases. The obtained materials exhibit high difference in sorption of these gases i.e. 1.5 and 2.8 mmol/g @30°C respectively and high SSA ~1600 m2/g what can be applied in separation applications. The highest uptakes were 1.8 and 3.1 mmol/g @30°C respectively. It was found that the presence of oxygen and nitrogen functional groups enhances C2H4/CO2 uptake ratio.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 81-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insights into factors of damage of surface rolling of railway wheels during operation
    Autorzy:
    Aaskerov, Hangardas
    Vakulenko, Igor
    Grischenko, Nikolaji
    Powiązania:
    https://bibliotekanauki.pl/articles/197938.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    carbon steel
    microhardness
    strain hardening
    rolling surface
    railway wheel
    non-metallic particles
    stal węglowa
    mikrotwardość
    umocnienie odkształceniowe
    powierzchnia toczna
    koło pojazdu szynowego
    właściwości niemetaliczne
    Opis:
    The systematization results of microstructure studies of carbon steel has made it possible to explain the mechanism of formation of certain damages to the rolling surface of railway wheels during operation. The evaluation ability of metal to strain hardening was used to explain the nature of the influence compactly located non-deformable dispersed particles on the strength properties steel during cold plastic deformation. In the process of the interaction of a railway wheel with a rail, successively occurring heterogeneities in the distribution of the plastic flow metal are one of the main reasons for the formation of defects on the rolling surface of the wheel.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 105; 27-33
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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