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    Tytuł:
    Efficiency of acetone-butanol-ethanol-water system separation by pervaporation
    Autorzy:
    Marszałek, J.
    Kamiński, W. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185102.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perwaporacja
    pervaporation
    biobutanol
    quaternary system
    Opis:
    The article focuses on multicomponent system separation with the use of an innovative membranebased technique i.e. pervaporation. Pervaporation is a membrane technique for separation of liquid mixtures on solid nonporous membranes. Pervaporation is used in this study to separate a quaternary system acetone-butanol-ethanol-water. Such a system may be derived from ABE fermentation process, and the resulting product, biobutanol, is a potential biofuel and may be used in internal combustion engines. Experiments in the study involving concentration of butanol by pervaporation were performed using PERVAP 4060 flat-sheet commercial membrane. To describe the PV process a semi-empirical approach was used. As a result of experiments and calculations permeance coefficients were obtained. Separation and permeance factors were calculated to assess the efficiency of the system separation. Beforehand, activity coefficients were determined for all the components of the mixture with the NRTL equation. Separation coefficients for all the components differed depending on process parameters: concentration, feed flow rate and process temperature. The study confirmed the separation effect of the quaternary system. The most interesting results were obtained for the concentration of butanol. Pervaporation allows to concentrate butanol over 10 times. The permeance coefficient reached for butanol an average value of 7.06 10-3 in comparison with the results for ethanol 3.24 10-2 and acetone 1.83 10-2 [kmol(m2h)-1]. The temperature change from 50 to 70 [degrees]C led to an increased permeance factor and there was no apparent effect on it in the feed flow rate. Due to the hydrophobicity of the membrane water fluxes in the quaternary system were negative.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 131-140
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of hydrodynamic conditions on the recovery of acetone, butanol and ethanol in pervaporation membrane modules
    Autorzy:
    Marszałek, J.
    Tylman, M.
    Rdzanek, P.
    Kamiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185317.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pervaporation
    membrane module
    flow modeling
    biobutanol
    perwaporacja
    moduł membranowy
    modelowanie przepływu
    Opis:
    In order to assess the influence of hydrodynamic effects on the recovery of n-butanol by means of pervaporation, a commercial PERVAP 4060 membrane was investigated. Laboratory pervaporation experiments were carried out providing a comparison of the permeation fluxes and enrichment factors. While the enrichment factors achieved in both modules under the same process conditions were comparable, the permeation fluxes differed from each other. In order to explain the observed differences, hydrodynamic conditions in the membrane module were examined by means of CFD simulation performed with ANSYS Fluent 14.5 software. Two different modules having membrane diameters of 80 mm and 150 mm were analyzed. As a result, different velocity profiles were obtained, which served to estimate the mass transfer coefficients of butanol, ethanol and acetone.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 2; 155--163
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Controlled System for the Magnetron Sputtering Deposition of the Metallic Multilayers
    Autorzy:
    Marszałek, K.
    Stępień, J.
    Mania, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/226224.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process control system
    Al-Ni
    magnetron sputtering
    Opis:
    Deposition of the metallic multilayers is a part of the scientific program on the chemical reaction leading to intermetallic compound formation. This reaction is known as self propagation high temperature synthesis (SHS). The key problem in this investigation is to produce the metallic multilayer system with good repeatability of thin films thicknesses. Thin should be thin, parallel and with low volume of intermixing region between components. Computer control system for the pulsed (mid frequency MF) magnetron sputtering equipment dedicated for metallic multilayers deposition is presented in this paper. The rotation velocity of the sample holder and the gas inlet through membrane valves are the main parameters controlled by the system. Parameters of the magnetron gun power supply, sample temperature and technological gas pressure are registered. The process cards which define all process parameters are collected for each dedicated process type. All cards are collected in a process cards library which permits for full automatization of all operations. Software was written in a graphical LabVIEW environment.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 4; 291-298
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on 16Mo3 (16M) Steel Pipes Overlaid with Haynes NiCro625 Alloy using MIG (131) Method
    Badania rurze stali 16Mo3 (16M) napawanych metodą MIG (131) stopem Haynes NiCro625
    Autorzy:
    Golański, G.
    Lachowicz, M.
    Słania, J.
    Jasak, J.
    Marszałek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352794.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    overlay weld
    steel pipe
    MIG method
    Haynes Nicro625
    napoina
    rury stalowe
    metoda MIG
    stop Haynes Nicro625
    Opis:
    The paper presents the research on the microstructure and mechanical properties of a pipe made of 16Mo3 steel, overlaid with superalloy based on Haynes NiCro625 nickel. The overlay weld was overlaid using the MIG (131) method. The performed macro - and microscopic tests have shown the correct structure of the overlay weld without any welding unconformities. The examined overlay weld was characterized by a dendritic structure of the primary crystals accumulating towards the heat removal. It has been proved that the content of iron in the surface zone does not exceed 7%, and the steel-superalloy joint shows the highest properties in comparison with the materials joined.
    W pracy przedstawiono badania mikrostruktury i właściwości mechanicznych napawanej rury ze stali 16Mo3 nadstopem na bazie niklu Haynes NiCro625. Napoina napawana była metodą MIG (131). Przeprowadzone badania makro –i mikroskopowe wykazały prawidłową budowę napoiny bez niezgodności spawalniczych. Badana napoina charakteryzowała się budową dendrytyczną o kryształach pierwotnych narastających w kierunku odprowadzania ciepła. Wykazano, że zawartość żelaza w strefie przypowierzchniowej nie przekracza 7%, a samo połączenie stal/nadstop wykazuje najwyższe właściwości w porównaniu do łączonych materiałów.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2521-2524
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bovine neonatal pancytopenia in calves in Poland
    Autorzy:
    Jaskowski, J.M.
    Polak, M.P.
    Marszalek, A.
    Nowak, K.
    Frackowiak, H.
    Olechnowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/30613.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bovine neonatal pancytopenia
    calf
    symptom
    bleeding
    diathesis
    thrombocytopenia
    ecchymosis
    etiology
    Polska
    Opis:
    Bovine neonatal pancytopenia (BNP), a newly emerged syndrome of discussed etiology in calves, has been diagnosed since 2006. Here we describe first cases of BNP in Poland. Between September 2008 and April 2011, 62 cases of BNP were diagnosed in dairy calves. Bleeding skin lesions were mostly pronounced in summer and early autumn. Severe thrombocytopenia was observed in all sick animals. All calves came from herds vaccinated against BVDV infection with PregSure BVD vaccine (Pfizer). Substitution of colostrum from dams of BNP positive calves with colostrum from dams from herds free of BNP was the only effective measure to avoid new cases in affected herds.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agrobacterium -mediated transformation of tobacco and sorghum with a genetic construct containing genes encoding enzymes in the sucrose synthesis pathway
    Autorzy:
    Marszalek, M.
    Zeyland, J.
    Luwanska, A.
    Wielgus, K.
    Slomski, R.
    Lipinski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/951210.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    Agrobacterium
    Agrobacterium tumefaciens
    transformation
    tobacco
    sorghum
    gene encoding
    enzyme
    sucrose
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Road traffic parameters measuring system with variable structure
    Autorzy:
    Burnos, P.
    Gajda, J.
    Marszałek, Z.
    Piwowar, P.
    Sroka, R.
    Stencel, M.
    Żegleń, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/220542.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic parameters measurement
    weigh-in-motion systems
    vehicle classification
    Opis:
    Systems of road traffic parameters measurement play a key role in the process of road traffic control, its supervision as well as in gathering and processing information for statistical purposes. Expectations of users of such systems mainly concern automation and provision of measurement continuity, possibility of selection of the measured road traffic parameters and high accuracy along with reliability of obtained results. In order to meet the requirements set for such systems, at the Department of Instrumentation and Measurement of the AGH University of Science and Technology in Cracow a new prototype system of road traffic parameters measurement - Traffic-1 - has been constructed. The innovativeness of the solution is manifested in the structure of the system that can be modified by the user adequately to current measurement needs and in the used algorithms of signals processing. The work contains a brief description of the constructed system with particular focus on the used innovations that are the result of many years of research work of the designers.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 659-666
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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