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    Wyświetlanie 1-3 z 3
    Tytuł:
    A computer aided analysis and forecasting of gas reservoir production
    Autorzy:
    Żygas, Wojciech
    Blicharski, Jacek
    Rybicki, Czesław
    Powiązania:
    https://bibliotekanauki.pl/articles/2203343.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja
    analiza numeryczna
    produkcja gazu
    computer application
    optimization
    gas production
    energy conditions
    numerical analysis
    Opis:
    The article presents a methodology for analysing historical gas production data and determining the gas reserves and the petrophysical parameters of a reservoir-aquifer system. These parameters are obtained from a fitting algorithm using production data sets. A forecast of the future field gas production can be created on the calibrated mathematical model basis. The developed method is based on the material balance assumptions and the widely used Fetkovich and van Everdingen-Hurst equations for calculating water influx. To conduct the calculations and analyse production data, the computer application was developed using Python programming language. A user-friendly graphical interface makes the proposed application convenient and intuitive to use. The software was calibrated based on the literature data from the gas field of known parameters and then validated using five case studies of the actual gas fields in the Polish Carpathian Foredeep. From the tests, very high compatibility between the computed and the real field values were obtained. An additional comparison with the commercial program MatBal confirmed the proper functioning of the application.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 4; 565--601
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Puffed cereals with added chamomile - quantitative analysis of polyphenols and optimization of their extraction method
    Autorzy:
    Blicharski, Tomasz
    Oniszczuk, Anna
    Olech, Marta
    Oniszczuk, Tomasz
    Wójtowicz, Agnieszka
    Krawczyk, Wojciech
    Nowak, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/986662.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    matricaria chamomilla
    functional food
    polyphenolic antioxidants
    lc-esi-ms/ms analysis
    extraction methods
    Opis:
    Introduction. Functional food plays an important role in the prevention, management and treatment of chronic diseases. One of the most interesting techniques of functional food production is extrusion-cooking. Functional foods may include such items as puffed cereals, breads and beverages that are fortified with vitamins, some nutraceuticals and herbs. Due to its pharmacological activity, chamomile flowers are the most popular components added to functional food. Objective. Quantitative analysis of polyphenolic antioxidants, as well as comparison of various methods for the extraction of phenolic compounds from corn puffed cereals, puffed cereals with an addition of chamomile (3, 5, 10 and 20%) and from Chamomillae anthodium. Materials and Methods. Two modern extraction methods – ultrasound assisted extraction (UAE) at 40 °C and 60 °C, as well as accelerated solvent extraction (ASE) at 100 °C and 120 °C were used for the isolation of polyphenols from functional food. Analysis of flavonoids and phenolic acids was carried out using reversed-phase high-performance liquid chromatography and electrospray ionization mass spectrometry (LC-ESI-MS/MS). Results and Conclusions. For most of the analyzed compounds, the highest yields were obtained by ultrasound assisted extraction. The highest temperature during the ultrasonification process (60 °C) increased the efficiency of extraction, without degradation of polyphenols. UAE easily arrives at extraction equilibrium and therefore permits shorter periods of time, reducing the energy input. Furthermore, UAE meets the requirements of ‘Green Chemistry’.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2017, 24, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing iso-1-cytochrome c structure by site-directed spin labeling and electron paramagnetic resonance techniques
    Autorzy:
    Pyka, Janusz
    Osyczka, Artur
    Turyna, Bohdan
    Blicharski, Wojciech
    Froncisz, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1044446.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    iso-1-cytochrome c
    Saccharomyces cerevisiae
    site-directed mutagenesis
    spin label
    electron paramagnetic resonance
    Opis:
    A cysteine-specific methanethiosulfonate spin label was introduced into yeast iso-1-cytochrome c at three different positions. The modified forms of cytochrome c included: the wild-type protein labeled at naturally occurring C102, and two mutated proteins, S47C and L85C, labeled at positions 47 and 85, respectively (both S47C and L85C derived from the protein in which C102 had been replaced by threonine). All three spin-labeled protein derivatives were characterized using electron paramagnetic resonance (EPR) techniques. The continuous wave (CW) EPR spectrum of spin label attached to L85C differed from those recorded for spin label attached to C102 or S47C, indicating that spin label at position 85 was more immobilized and exhibited more complex tumbling than spin label at two other positions. The temperature dependence of the CW EPR spectra and CW EPR power saturation revealed further differences of spin-labeled L85C. The results were discussed in terms of application of the site-directed spin labeling technique in probing the local dynamic structure of iso-1-cytochrome c.
    Źródło:
    Acta Biochimica Polonica; 1999, 46, 4; 889-899
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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