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    Wyświetlanie 1-9 z 9
    Tytuł:
    Inductive sensors for weighing of mass
    Autorzy:
    Lewandowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220427.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive load cell
    electronic scales
    measuring system of mass
    Opis:
    A new method measuring of mass in electronic system of scales has been described. The main element of this system is inductive measuring load cell, which was compared with strain gauge load cell. The aim of the paper is described advantages of the inductive measuring system of mass and explain some main problems of this system. Digital correction of the mechanical errors of the beam like: hysteresis, creep material of the beam under constant load, influence of ambient temperature was described.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 323-334
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simplified mathematical model of a U-tube steam generator under variable load conditions
    Autorzy:
    Laskowski, R.
    Lewandowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240139.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam generator
    mathematical model under variable load conditions
    wytwornica pary
    model matematyczny
    zmienne warunki obciążenia
    Opis:
    A steam generator in a nuclear power plant with a light water reactor is a heat exchanger, in which the heat is being transferred from the primary to the secondary loop (it links the primary and secondary loops). When the power plant is running, the inlet parameters (temperatures and mass flow rates) on both sides of the steam generator can change. It is important to know how the changes of these parameters affect the steam generator performance. The complexity of the processes taking place in the steam generator makes it difficult to create a simulator reflecting its performance under changed conditions. In order to simplify the task, the steam generator was considered as a ‘black box’ with the aim of examining how the changes of the inlet parameters affect the changes of the outlet ones. On the basis of the system (steam generator) response, a simple mathematical model of the steam generator under variable load conditions was proposed. In the proposed model, there are two dimensionless parameters and three constant coefficients. A linear relation between these dimensionless parameters was obtained. The correctness of the model was verified against the data obtained with a steam generator simulator for European Pressured Reactor and AP-600 reactors. A good agreement between the proposed model and the simulator data was achieved.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 75-88
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adress for Professor Krzysztof Jan Jesionek Anniversary
    Autorzy:
    Lewandowski, J.
    Gnutek, Z.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175358.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam and gas turbine
    power boiler
    compressors
    fluid-flow machinery
    power plants
    Opis:
    This article presents professional activity of Krzysztof Jesionek within the background of his personal career in the field of heat and power engineering on Wrocław University of Technology. In particular, we present stages of scientific and professional development with an emphasis on nature Professor Jesionek’s career main driving forces as a result of his cooperation with industry and power engineering.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 3-20
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic analysis of biofuels as fuels for high temperature fuel cells
    Autorzy:
    Milewski, J.
    Bujalski, W.
    Lewandowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240906.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biopaliwa
    modelowanie matematyczne
    ogniwo węglanowe
    tlenkowe ogniwa paliwowe
    biofuels
    mathematical modeling
    Molten carbonate fuel cell
    solid oxide fuel cell
    Opis:
    Based on mathematical modeling and numerical simulations, applicativity of various biofuels on high temperature fuel cell performance are presented. Governing equations of high temperature fuel cell modeling are given. Adequate simulators of both solid oxide fuel cell (SOFC) and molten carbonate fuel cell (MCFC) have been done and described. Performance of these fuel cells with different biofuels is shown. Some characteristics are given and described. Advantages and disadvantages of various biofuels from the system performance point of view are pointed out. An analysis of various biofuels as potential fuels for SOFC and MCFC is presented. The results are compared with both methane and hydrogen as the reference fuels. The biofuels are characterized by both lower efficiency and lower fuel utilization factors compared with methane. The presented results are based on a 0D mathematical model in the design point calculation. The governing equations of the model are also presented. Technical and financial analysis of high temperature fuel cells (SOFC and MCFC) are shown. High temperature fuel cells can be fed by biofuels like: biogas, bioethanol, and biomethanol. Operational costs and possible incomes of those installation types were estimated and analyzed. A comparison against classic power generation units is shown. A basic indicator net present value (NPV) for projects was estimated and commented.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 4; 41-65
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and functional relationship of mammalian and nematode ferritins
    Autorzy:
    Lewandowski, J.
    Komur, A.A.
    Sobanska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096865.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nematode ferritins
    FTH1
    Caenorhabditis elegans
    Opis:
    Ferritin is a unique buffering protein in iron metabolism. By storing or releasing iron in a tightly controlled manner, it prevents the negative effects of free ferrous ions on biomolecules in all domains of life – from bacteria to mammals. This review focuses on the structural features and activity of the ferritin protein family with an emphasis on nematode ferritins and the similarities in their biological roles with mammalian ferritins. The conservative characteristic of the ferritin family across the species originates from the ferroxidase activity against redox-active iron. The antioxidative function of these proteins translates into their involvement in a wide range of important biological processes, e.g., aging, fat metabolism, immunity, anticancer activity, and antipathogenic activity. Moreover, disturbances in ferritin expression lead to severe iron-associated diseases. Research on the Caenorhabditis elegans model organism may allow us to better understand the wide spectrum of mechanisms involving ferritin activity.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 4; 457-471
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie ciepła ze spalin wylotowych z kotła w bloku energetycznym klasy 900 MW
    The use of heat recovered from boiler flue gases in a 900 MW class power plant
    Autorzy:
    Wołowicz, M.
    Milewski, J.
    Bujalski, W.
    Lewandowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/173055.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spaliny
    blok energetyczny
    ciepło ze spalin
    exhaust
    power unit
    heat from exhaust
    Opis:
    W artykule przedstawiona została koncepcja wykorzystania ciepła ze spalin wylotowych z kotła do podgrzewu wody zasilającej i powietrza dla nadkrytycznego bloku węglowego. W celu przeprowadzenia analizy zbudowany został model bloku pracującego w zmienionych warunkach (off design) oraz wygenerowane zostały jego charakterystyki. Przedstawiono informacje na temat zaproponowanej koncepcji umieszczenia dodatkowego wymiennika w schemacie cieplnoprzepływowym rozpatrywanego bloku. Omówiona została również koncepcja wykorzystania ciepła ze spalin do podgrzewu powietrza wlotowego do kotła i na podstawie obliczeń zaproponowane zostały parametry takiego układu.
    The paper presents the concept of using heat recovered from flue gases to heat up feedwater and inlet air in supercritical coal-fired unit. This concept has been developed for the reference condensing unit of 900 MW – class. In order to enable the analyse the model of such unit was build and its characteristics were generated using the off design mode. The concept of an additional heat exchanger and its place in the unit scheme was provided. Also the concept of using heat recovered from flue gases to heat up the intake air to the boiler was discussed. Based on calculations the parameters of such system were proposed.
    Źródło:
    Archiwum Energetyki; 2013, 43, 1/2; 101-108
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Annular Array Transducer and Matched Amplifier for Therapeutic Ultrasound
    Autorzy:
    Secomski, W.
    Nowicki, A.
    Wójcik, J.
    Lewandowski, M.
    Walczak, M.
    Tymkiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/177840.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic therapy
    annular array transducer
    ultrasonic field
    Opis:
    The use of therapeutic ultrasound continues to grow. A focused ultrasonic wave can increase the tissue temperature locally for the non-invasive cancer treatment or other medical applications. The authors have designed a seven-element annular array transducer operating at 2.4 MHz. Each element was excited by sine burst supplied by a linear amplifier and FPGA control circuits. The acoustic field, generated by a transducer was initially numerically simulated in a computer and next compared to water tank hydrophone measurements performed at 20, 40 and 60 mm focal depth. The results showed good agreement of the measurements with theory and the possibility to focus the ultrasound in the preselected area. The total acoustic power radiated by the annular array was equal to 2.4 W.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 653-660
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Limited pattern of TCR delta chain gene rearrangement on the RNA level in multiple sclerosis
    Autorzy:
    Nowak, J
    Januszkiewicz, D.
    Pernak, M.
    Hertmanowska, H.
    Nowicka-Kujawska, K.
    Rembowska, J.
    Lewandowski, K.
    Nowak, T.
    Wender, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041829.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    patient
    human genetics
    brain
    multiple sclerosis
    autoagression
    T cell receptor rearrangement
    gene rearrangement
    RNA level
    chain gene
    Źródło:
    Journal of Applied Genetics; 2001, 42, 4; 531-540
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thick Film Transducers for High Frequency Coded Ultrasonography
    Autorzy:
    Nowicki, A.
    Lewandowski, M.
    Wójcik, J.
    Tymkiewicz, R.
    Lou-Moller, R.
    Wolny, W.
    Zawada, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/176939.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transducers
    thick film
    high frequency ultrasound
    pulse compression
    Golay codes
    Opis:
    Recently a new technology of piezoelectric transducers based on PZT thick film has been developed as a response to a call for devices working at higher frequencies suitable for production in large numbers at low cost. Eight PZT thick film based focused transducers with resonant frequency close to 40 MHz were fabricated and experimentally investigated. The PZT thick films were deposited on acoustically engineered ceramic substrates by pad printing. Considering high frequency and nonlinear propagation it has been decided to evaluate the axial pressure field emitted (and reflected by thick metal plate) by each of concave transducer differing in radius of curvature – 11 mm, 12 mm, 15 mm, 16 mm. All transducers were activated using AVTEC AVG-3A-PS transmitter and Ritec diplexer connected directly to Agilent 54641D oscilloscope. As anticipated, in all cases the focal distance was up to 10% closer to the transducer face than the one related to the curvature radius. Axial pressure distributions were also compared to the calculated ones (with the experimentally determined boundary conditions) using the angular spectrum method including nonlinear propagation in water. The computed results are in a very good agreement with the experimental ones. The trans- ducers were excited with Golay coded sequences at 35–40 MHz. Introducing the coded excitation allowed replacing the short-burst transmission at 20 MHz with the same peak amplitude pressure, but with almost double center frequency, resulting in considerably better axial resolution. The thick films exhibited at least 30% bandwidth broadening comparing to the standard PZ 27 transducer, resulting in an increase in matching filtering output by a factor of 1.4–1.5 and finally resulting in a SNR gain of the same order.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 945-954
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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