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    Wyświetlanie 1-7 z 7
    Tytuł:
    Experimental investigations on punching shear of flat slabs made from lightweight aggregate concrete
    Badania eksperymentalne przebicia płyt płaskich wykonanych z lekkiego betonu kruszywowego
    Autorzy:
    Gołdyn, M.
    Krawczyk, Ł.
    Ryżyński, W.
    Urban, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/230726.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przebicie
    beton lekki kruszywowy
    popiół lotny
    naprężenia styczne
    trzpień dwugłówkowy
    punching shear
    lightweight aggregate concrete
    fly ash
    shear stress
    double-headed stud
    Opis:
    In the paper the results of authors’ experimental investigations concerning punching shear of flat slabs made from lightweight concrete with "CERTYD" aggregate were presented. This aggregate is manufactured from fly ash accumulated in electrostatic precipitators and ash-slag mixture from wet furnace waste generated in the process of burning hard coal in a combined heat and power plant. A total of six specimens with dimensions of 2400 x 2400 x 200 mm were tested. The slabs were connected with short fragments of columns of a cross-section of 250 x 250 mm and a height of 150 mm. The main variable parameter was slab longitudinal reinforcement ratio ρl, equal to 0.47, 0.86 and 1.23% intentionally. One of the pair of models with the same longitudinal reinforcement was the control specimen and did not contain shear reinforcement.
    W pracy przedstawiono wyniki własnych badań eksperymentalnych dotyczących przebicia płaskich płyt z betonu lekkiego, wykonanego na kruszywie „CERTYD”, produkowane przez firmę LSA sp. z o.o. z Białegostoku. Kruszywo to powstaje z popiołów lotnych zgromadzonych w elektrofiltrach i mieszanki popiołowo-żużlowej z mokrego usuwania odpadów piecowych, wytwarzanych w procesie spalania węgla kamiennego w elektrociepłowni. Zbadano 6 modeli płyt płaskich o wymiarach 2400 x 2400 x 200 mm, połączonych z krótkimi fragmentami słupów o przekroju 250 x 250 mm i wysokości 150 mm. Głównym parametrem zmiennym był stopień zbrojenia podłużnego ρl, równy w zmierzeniu 0,47, 0,86 oraz 1,23%. Jeden z pary modeli o tym samym stopniu zbrojenia stanowił element odniesienia dla modelu zbrojonego na przebicie.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 293-306
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Effects Induced in Liver Tissues by Pulsed Focused Ultrasonic Beams from Annular Array Transducer
    Autorzy:
    Kujawska, T.
    Secomski, W.
    Krawczyk, K.
    Nowicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176937.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    annular array transducer
    pulsed focused nonlinear ultrasound
    electronically moved focus
    tissue heating
    biological effects
    tissue necrosis
    Opis:
    Many therapeutic applications of pulsed focused ultrasound are based on heating of detected lesions which may be localized in tissues at different depths under the skin. In order to concentrate the acoustic energy inside tissues at desired depths a new approach using a planar multi-element annular array transducer with an electronically adjusted time-delay of excitation of its elements, was proposed. The 7-elements annular array transducer with 2.4 MHz center operating frequency and 20 mm outer diameter was produced. All its elements (central disc and 6 rings) had the same radiating area. The main purpose of this study was to investigate thermal fields induced in bovine liver in vitro by pulsed focused ultrasonic beams with various acoustic properties and electronically steered focal plane generated from the annular array transducer used. The measurements were performed for the radiating beams with the 20 mm focal depth. In order to maximize nonlinear effects introducing the important local temperature rise, the measurements have been performed in two-layer media comprising of a water layer, whose thickness was specific for the transducer used and equal to 13 mm, and the second layer of a bovine liver with a thickness of 20 mm. The thickness of the water layer was determined numerically as the axial distance where the amplitude of the second harmonics started to increase rapidly. The measurements of the temperature rise versus time were performed using a thermocouple placed inside the liver at the focus of the beam. The temperature rise induced in the bovine liver in vitro by beams with the average acoustic power of 1W, 2Wand 3Wand duty cycle of 1/5, 1/15 and 1/30, respectively, have been measured. For each beam used the exposure time needed for the local tissue heating to the temperature of 43.C (used in therapies based on ultrasonic enhancement of drug delivery or in therapies involving stimulation of immune system by enhancement of the heat shock proteins expression) and to the temperature of 56.C (used in HIFU therapies) was determined. Two sets of measurements were done for each beam considered. First, the thermocouple measurement of the temperature rise was done and next, the real-time monitoring of dynamics of growth of the necrosis area by using ultrasonic imaging technique, while the sample was exposed to the same acoustic beam. It was found that the necrosis area becomes visible in the ultrasonic image only for beams with the average acoustic power of 3 W, although after cutting the sample the thermo ablated area was visible with the naked eye even for the beams with lower acoustic power. The quantitative analysis of the obtained results allowed to determine the exposure time needed to get the necrosis area visible in the ultrasonic image.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 937-944
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noninvasive Imaging of Thermal Fields Induced in Soft Tissues In Vitro by Pulsed Focused Ultrasound Using Analysis of Echoes Displacement
    Autorzy:
    Karwat, P.
    Litniewski, J.
    Kujawska, T.
    Secomski, W.
    Krawczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/176451.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high intensity focused ultrasound
    HIFU
    therapeutic ultrasound
    ultrasonic imaging
    echo strain estimation
    Opis:
    Therapeutic and surgical applications of focused ultrasound require monitoring of local temperature rises induced inside tissues. From an economic and practical point of view ultrasonic imaging techniques seem to be the most suitable for the temperature control. This paper presents an implementation of the ultrasonic echoes displacement estimation technique for monitoring of local temperature rise in tissue during its heating by focused ultrasound The results of the estimation were compared to the temperature measured with thermocouple. The obtained results enable to evaluate the temperature fields induced in tissues by pulsed focused ultrasonic beams using non-invasive imaging ultrasound technique.
    Źródło:
    Archives of Acoustics; 2014, 39, 1; 139-144
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in serum neopterin and C-reactive protein concentrations in female dogs with mammary gland tumours
    Autorzy:
    Szczubiał, M.
    Dabrowski, R.
    Łopuszyński, W.
    Bochniarz, M.
    Krawczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087616.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neopterin
    C-reactive protein
    mammary gland tumours
    female dogs
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 4; 691-696
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment
    Autorzy:
    Jankowska, S.
    Czakiert, T.
    Krawczyk, G.
    Borecki, P.
    Jesionowski, Ł.
    Nowak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185424.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    paliwo tlenowe
    CFB
    oxy-fuel
    fuel-N
    Opis:
    This paper presents a study on nitrogen conversion in oxy-fuel coal combustion in a pilot scale CFB 0.1 MWth facility. The paper is focused on fuel-N behaviour in the combustion chamber when the combustion process is accomplished under oxy-fuel CFB conditions. The analysis is based on infurnace sampling of flue gas and calculations of the conversion ratios of fuel-nitrogen (fuel-N) to NO, NO2, N2O, NH3 and HCN. For the tests, O2/CO2 mixtures with the oxygen content of 21 vol.% (primary gas) and with the oxygen content varied from 21 to 35 vol.% (secondary gas), were used as the fluidising gas. Measurements were carried out in 4 control points located along the combustion chamber: 0.43 m, 1.45 m, 2.50 m and 4.88 m. Results presented below indicate that an increased oxygen concentration in the higher part of the combustion chamber has strong influence on the behaviour of fuel based nitrogen compounds.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 4; 489-496
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Forming Process of Energy-Absorbing Elements made from 7000 Series High-Strength Aluminum Alloy
    Autorzy:
    Jaśkiewicz, K.
    Skwarski, M.
    Polak, S.
    Gronostajski, Z.
    Krawczyk, J.
    Kaczyński, P.
    Chorzępa, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/355556.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloys
    hot forming
    Opis:
    The paper covers the research on the process of solutionizing of 7075 aluminum alloy in cold tools during the stamping of a high-strength structural element (B-pillar’s base). For technological reasons, in order to obtain high strength parameters of the 7075 alloy, it is necessary to carry out a solutionization process, which allows to obtain dispersion strengthening during ageing process. Properly performed heat treatment of the alloy increases the strength of the material to approx. 600 MPa. The combination of the process of solutionization with simultaneous shaping is aimed at improving and simplifying technological operations of aluminum alloy stamping, shortening the duration of the manufacturing process and reducing production costs. The manufactured lower part of the B-pillar will be used for the verification of the validity of the developed method. During the experiment, a series of stamping tests were carried out, in which the lubricants, pressure and position of the upper and lower blankholders were the variables. The obtained results allow to estimate the influence of the cooling conditions on the strength of the drawpieces obtained after the process of artificial ageing. In order to verify and analyse the results more quickly, a numerical simulation was carried out.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 697-705
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility of FPGA to HPC computation migration of plasma impurities diagnostic algorithms
    Autorzy:
    Linczuk, P.
    Krawczyk, R. D.
    Zabolotny, W.
    Wojenski, A.
    Kolasinski, P.
    Pozniak, K. T.
    Kasprowicz, G.
    Chernyshova, M.
    Czarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226512.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma diagnostic
    GEM system
    feedback loops
    Intel Xeon
    Intel Xeon Phi
    high performance computing HPC
    Opis:
    We present a feasibility study of fast events parameters estimation algorithms regarding their execution time. It is the first stage of procedure used on data gathered from gas electron multiplier (GEM) detector for diagnostic of plasma impurities. Measured execution times are estimates of achievable times for future and more complex algorithms. The work covers usage of Intel Xeon and Intel Xeon Phi - high-performance computing (HPC) devices as a possible replacement for FPGA with highlighted advantages and disadvantages. Results show that less than 10 ms feedback loop can be obtained with the usage of 25% hardware resources in Intel Xeon or 10% resources in Intel Xeon Phi which leaves space for future increase of algorithms complexity. Moreover, this work contains a simplified overview of basic problems in actual measurement systems for diagnostic of plasma impurities, and emerging trends in developed solutions.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 3; 323-328
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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