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    Wyświetlanie 1-8 z 8
    Tytuł:
    Methane fermentation of poultry manure — shortcomings and advantages of the technology: fermentation or co-fermentation?
    Autorzy:
    Sakiewicz, P.
    Cebula, J.
    Piotrowski, K.
    Bohdziewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191819.pdf
    Data publikacji:
    2019
    Wydawca:
    Gdańska Szkoła Wyższa
    Tematy:
    methane fermentation
    biogas
    poultry breeding industry
    poultry manure
    co-fermentation
    Opis:
    Overcoming of technological barriers in methane fermentation of substrates including poultry manure derived from poultry-breeding industry is regarded as one of strategic trends in biogas-technology development. The essential limitations and possibilities of such substrates for biogas production is presented here. It should be emphasized, that biogas production based on poultry manure from industrial-scale farms is effective solution of important ecological problem with simultaneous production of green energy and efficient solution of odours emission from the poultry breeding farm. Methane co-fermentation of post-processed bedding premixed with poultry manure solves, at least partly, problem of correct C/N ratio in the substrate mixture.
    Źródło:
    Eco-Energetics: technologies, environment, law and economy; 2019, 2; 97--104
    2657-5922
    2657-7674
    Pojawia się w:
    Eco-Energetics: technologies, environment, law and economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of methane fermentation of selected post-processed poultry beddings — possibilities of process intensification and limitations
    Autorzy:
    Sakiewicz, P.
    Cebula, J.
    Piotrowski, K.
    Bohdziewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190121.pdf
    Data publikacji:
    2019
    Wydawca:
    Gdańska Szkoła Wyższa
    Tematy:
    poultry breeding manure
    methane fermentation
    process kinetics
    batch biogas production process
    modified Gompertz model
    Opis:
    The kinetics of methane fermentation of selected post-processed poultry beddings was analyzed. A modified nonlinear Gompertz model was applied for the calculations. The presented kinetic parameter may be useful for design or optimization calculations of agricultural-biogas installations integrated with industrial-scale poultry breeding.
    Źródło:
    Eco-Energetics: technologies, environment, law and economy; 2019, 2; 105--112
    2657-5922
    2657-7674
    Pojawia się w:
    Eco-Energetics: technologies, environment, law and economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural and chemical analysis of selected poultry bedding materials — potential substrates in agricultural biogas production technologies
    Autorzy:
    Sakiewicz, P.
    Cebula, J.
    Piotrowski, K.
    Bohdziewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190126.pdf
    Data publikacji:
    2019
    Wydawca:
    Gdańska Szkoła Wyższa
    Tematy:
    agricultural biogas
    poultry breeding
    bedding biomaterials
    chemical analysis
    microstructural analysis
    Opis:
    The research results concerning microstructure and chemical composition of selected post-processed poultry beddings derived from industrial-scale poultry breeding are presented. It was found, that the proper trend is providing the optimal conditions in respect to bred-animals comfort. The highest concentration of biogenic elements — especially nitrogen and potassium — was observed for the samples of poultry manure premixed with the straw. High quality of bedding biomass influences the inhibition of poultry-manure decomposition processes advantageously. In effect, biogas yield increases (due to C/N adjustment), in spite of the fact that increase in ammonium nitrogen concentration simultaneously inhibits the methane fermentation process.
    Źródło:
    Eco-Energetics: technologies, environment, law and economy; 2019, 2; 113--122
    2657-5922
    2657-7674
    Pojawia się w:
    Eco-Energetics: technologies, environment, law and economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Halloysite as Mineral Adsorbent of CO2 – Kinetics and Adsorption Capacity
    Haloizyt jako adsorbent mineralny CO2 – badania kinetyki adsorpcji i pojemności sorpcyjne
    Autorzy:
    Lutyński, M.
    Sakiewicz, P.
    Gonzalez, M. A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/318447.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    physical adsorption
    carbon dioxide
    halloysite
    adsorption kinetics
    adsorpcja fizyczna
    dwutlenek węgla
    haloizyt
    kinetyka adsorpcji
    Opis:
    Physical adsorption of carbon dioxide on various mineral adsorbents is becoming extremely interesting in the field of energy and environment where CCS technology is an option for CO2 emission reduction. In the article the halloysite from Dunino deposit was assessed in terms of its potential use as a CO2 adsorbent. Results of tests indicate that modified halloysite (i.e. calcinated or modified by acid treatment) has a relatively low adsorption capacity which should be easily increased by other surface modification methods. Sorption kinetic is rather fast and over 85-89% of CO2 adsorption is accounted by a rapid sorption step i.e. 7 to 16 seconds.
    Procesy adsorpcji fizycznej CO2 na różnego rodzaju adsorbentach mineralnych są istotne z punktu widzenia technologii wychwytywania i separacji tego gazu z dużych źródeł stacjonarnych (CCS). W artykule przedstawiono wyniki adsorpcji CO2 na haloizycie ze złoża Dunino, który może mieć potencjalne zastosowanie w technologiach adsorpcyjnych. Rezultaty badań wskazują, że adsorpcja CO2 na modyfikowanym haloizycie tj. kalcynowanym oraz kwasowanym jest relatywnie niska w porównaniu z innymi adsorbentami mineralnymi, jednakże odpowiednia metoda jego modyfikacji może zwiększyć znacznie jego chłonność sorpcyjną. Przeanalizowano również kinetykę sorpcji, gdzie oszacowano iż 85-89% CO2 adsorbuje się w czasie 7-16 sekund.
    Źródło:
    Inżynieria Mineralna; 2014, R. 15, nr 1, 1; 111-117
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Purification of halloysite by magnetic separation
    Autorzy:
    Sakiewicz, P.
    Lutynski, M.
    Soltys, J.
    Pytlinski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110768.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    halloysite
    magnetic separation
    HCl treatment
    Opis:
    Rational use of mineral resources requires advanced separation methods in order to obtain high quality products. In this study chemical treatment with magnetic separation of halloysite from Dunino (Poland) is presented. Initial crushing, hydrochloric acid absorption treatment, sedimentation (settling) and polygradient magnetic separation in weak magnetic field were applied to separate aluminosilicates from iron and titanium oxides (impurities). The process allowed to obtain a product of approximately 98% purity of the aluminosilicate fraction (halloysite + kaolinite). The tailings from magnetic separation consisted of iron oxides, while the intermediate product consisted mainly of aluminosilicate and iron chlorides resulting from the HCl treatment. The obtained products can be used as a component of polymer nanocomposites, sorbents and in ceramics industry.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 991-1001
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel
    Autorzy:
    Borek, W.
    Lis, M.
    Gołombek, K.
    Sakiewicz, P.
    Piotrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/378652.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    high-Mn steel
    TWIP type steel
    plastic deformation
    twinning
    dynamic deformation
    structure
    mechanical properties
    stal wysokomanganowa
    stal TWIP
    odkształcenie plastyczne
    bliźniakowanie
    odkształcenie dynamiczne
    struktura
    własności mechaniczne
    Opis:
    Purpose: The aim of the paper is to determine influence of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel tested at room temperature. Design/methodology/approach: Mechanical properties of tested steel was determined using Zwick Z100 static testing machine for testing with the deformation speed equal 0.008 s-1, and RSO rotary hammer for testing with deformation speeds of 250, 500 and 1000s-1. The microstructure evolution samples tested in static and dynamic conditions was determined in metallographic investigations using light microscopy as well as X-ray diffraction. Findings: Based on X-ray phase analysis results, together with observation using metallographic microscope, it was concluded, that the investigated high-Mn X13MnAlSiNbTi25-3-3 steel demonstrates austenitic structure with numerous mechanical twins, what agrees with TWIP effect. It was demonstrated, that raise of plastic deformation rate produces higher tensile strength UTS and higher conventional yield point YS0.2. The UTS strength values for deformation rate 250, 500 and 1000 s-1 grew by: 35, 24 and 31%, appropriately, whereas in case of YS0.2 these were: 7, 74 and 130%, accordingly, in respect to the results for the investigated steel deformed under static conditions, where UTS and YS0.2 values are 1050 MPa and 700 MPa. Opposite tendency was observed for experimentally measured uniform and total relative elongation. Homogeneous austenitic structure was confirmed by X-ray diffractometer tests. Research limitations/implications: To fully describe influence of strain rates on structure and mechanical properties, further investigations specially with using transmission electron microscope are required. Practical implications: Knowledge about obtained microstructures and mechanical properties results of tested X13MnAlSiNbTi25-3-3 steel under static and dynamic conditions can be useful for the appropriate use of this type of engineering material in machines and equipment susceptible to static or dynamic loads. Originality/value: The influence of plastic deformation at room temperature under static and dynamic conditions of new-developed high-manganese austenitic X13MnAlSiNbTi25-3-3 steels were investigated.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 96, 1; 22-31
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Properties of Ca65-xMg17.5Zn17.5+x (x = 0, 2.5, 5) Alloys
    Autorzy:
    Babilas, R.
    Wojciechowski, P.
    Bajorek, A.
    Sakiewicz, P.
    Cesarz-Andraczke, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352466.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ca-based alloys
    corrosion
    hydrogen evolution
    X-ray photoelectron spectroscopy
    Opis:
    The aim of the paper is to study the effect of zinc addition on the corrosion behavior of Ca65-xMg17.5Zn17.5+x(x = 0, 2.5, 5 at.%) alloys in simulated physiological fluids at 37°C. The electrochemical measurements allowed to determine a corrosion potential, which showed a positive shift from –1.60 V for Ca65Mg17.5Zn17.5 alloy to –1.58 V for Ca60Mg17.5Zn22.5 alloy, adequately. The more significant decrease of hydrogen evolution was noticed for Ca60Mg17.5Zn22.5 alloy (22.4 ml/cm2) than for Ca62.5Mg17.5Zn20 and Ca65Mg17.5Zn17.5 samples (29.9 ml/cm2 and 46.4 ml/cm2), consequently. The corrosion products after immersion tests in Ringer’s solution during 1 h were identified by X-ray diffraction and X-ray photoelectron spectroscopy as calcium, magnesium oxides, carbonates, hydroxides and calcium hydrate.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1033-1040
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses
    Autorzy:
    Nowosielski, R.
    Cesarz-Andraczke, K.
    Sakiewicz, P.
    Maciej, A.
    Jakóbik-Kolon, A.
    Babilas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/356929.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg-based alloys
    bulk metallic glasses
    amorphous structure
    corrosion properties
    biodegradable metallic alloys
    corrosion products
    Opis:
    The aim of this paper was to investigate the corrosion resistance of Mg66Zn30Ca4 and Mg68Zn28Ca4 metallic glasses and evaluate the ability of this amorphous alloy use for medical applications as biodegradable medical implants. Taking into account the amount of Mg, Zn, Ca elements dissolved in multielectrolyte physiological fluid (MPF) from Mg66+xZn30-xCa4 (x=0.2) alloys the daily dose of evolved ions from alloys components was determined. Additional goal of the paper was determination of corrosion rate (Vcorr) and amount of hydrogen evolved from amorphous magnesium alloys in simulated environment of human body fluids during 24h immersion and during electrochemical tests. Corrosion studies were done in the multielectrolyte physiological fluid (MPF) at 37°C. The amount of hydrogen evolved [ml/cm2] and corrosion rate Vcorr [mm/year] of amorphous Mg66Zn30Ca4 and Mg68Zn28Ca4 alloys were compared. The work also presents characterization of Mg-based bulk metallic glasses structure in the form of 2 mm thickness plates. Samples structure was analyzed by means of X-ray diffraction. Fracture and surface morphology of magnesium alloy samples were identified using scanning electron microscopy.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 807-810
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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