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    Wyświetlanie 1-11 z 11
    Tytuł:
    Using the Erfi function in the problem of the shape optimization of the compressed rod
    Autorzy:
    Marcinowski, J.
    Sadowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265861.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pręt ściskany
    optymalizacja kształtu
    wyboczenie
    program Mathematica
    compressed rod
    hollow rod
    shape optimization
    buckling criterion
    analytical approach
    Erfi function
    Opis:
    The shape of the optimal rod determined in the work meets the condition of mass conservation in relation to the reference rod. At the same time, this rod shows a significant increase in resistance to axial force. In the examples presented, this increase was 80% and 117%, respectively, for rods with slenderness of 125 and 175. A practical benefit from the use of compression rods of the proposed shapes is clearly visible. The example presented in this publication shows how great the utility in the structural mechanics can be, resulting from the applications of complex analysis (complex numbers). This approach to many problems can find its solutions, while they are lacking in the real numbers domains. What is more, although these are operations on complex numbers, these solutions have often their real representations, as the numerical example shows. There are too few applications of complex numbers in the technique and science, therefore it is obvious that the use of complex analysis should have an increasing range. One of the first people to use complex numbers was Girolamo Cardano. Cardano, using complex numbers, was solving cubic equations, unsolvable to his times – as the famous Franciscan and professor of mathematics Luca Pacioli put it in his paper Summa de arithmetica, geometria, proportioni et proportionalita (1494). It is worth mentioning that history has given Cardano priority in the use of complex numbers, but most probably they were discovered by another professor of mathematics – Scipione del Ferro (cf. [1]). We can see, that already then, they were definitely important (complex numbers).
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 75-87
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Plasma Focus discharges in the PF-360 facility with additional D2 gaspuffed targets
    Autorzy:
    Stanislawski, J.
    Baranowski, J.
    Sadowski, M.
    Zebrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147013.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    current sheath
    deuteron beams
    gas puffing
    neutron yield
    plasma focus
    Opis:
    The paper describes experimental studies of Plasma-Focus (PF) discharges carried out within the modernized PF- 360 facility, which was operated with an additional D2-gas puffing into the region of the collapsing current sheath and PF pinch formation, i.e. into space in front of the electrode outlet. The main aim of these studies was to increase a neutron yield from PF discharges by using fast deuteron beams, which are usually emitted from a pinch column and which can interact with additional D2-gas target.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 73-75
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Plasma-Focus discharges within the PF-360 facility equipped with a planar D2O-ice target
    Autorzy:
    Zebrowski, J.
    Baranowski, J.
    Jakubowski, L.
    Sadowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147057.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cryogenic target
    ion beams
    neutron yield
    plasma focus
    X-rays
    Opis:
    The paper reports on investigations of dense magnetized plasmas produced within a modernized PF-360 facility, which was operated with an additional planar cryogenic target placed in the front of the electrode outlet and covered with D2O-ice layers. The main aim of these studies was to overcome the neutron saturation effect and to increase the maximum neutron yield from PF discharges by using fast deuteron beams. Such beams are usually emitted from a pinch region and can produce fast neutrons from D-D reactions during their interactions with the additional target.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 65-68
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-automatic count of hepatic stellate cells from microscopic in-vitro images by modeling elliptical nuclei
    Półautomatyczna metoda zliczania komórek gwiaździstych wątroby na mikroskopowych obrazach in-vitro przez modelowanie ich eliptycznych jąder
    Autorzy:
    Bołdak, C.
    Sadowski, M.
    Jaroszewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/341137.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    przetwarzanie obrazów medycznych
    zliczanie komórek
    komórki gwiaździste wątroby
    medical image processing
    cell count
    hepatic stellate cells
    Opis:
    A new method of semi-automatic liver cell counting is presented. Instead of segmenting the cells bodies (not regular and fragmented in some stages of the cells life) it localizes the cells nuclei which are bright, homogeneous and elliptical structures with darker body (body fragments) on their circumference. The nuclei are modeled by ellipses which can be found in two manners: by local region growing algorithm and by reconstruction of the ellipse equation from its contour points. The found ellipses set is then downsized (since all possible ellipses are initially considered) by eliminating the closest one to another and the worst ones by mean of a special fitness function. The method is implemented as a visual, multiplatform JAVA application, easy to use in the scientific every-day work. It is evaluated on real microscopic in-vitro images of the hepatic stellate cells.
    W artykule tym zaprezentowana jest nowa, półautomatyczna metoda zliczania komórek wątroby. Zamiast skupiać sięna ciałach komórek (w niektórych fazach ich życia nieregularnych i pofragmentowanych) lokalizuje ona ich jądra, które są jasnymi, jednolitymi i eliptycznymi strukturami otoczonymi przez ciemniejsze ciało (lub jego fragmenty). Jądra komórek są modelowane na 2 sposoby: przez lokalny algorytm rozrostu obszaru i przez odtworzenie równania elipsy z jej punktów na obwodzie.Wśród wszystkich znalezionych elips (początkowa każda jej potencjalna lokalizacja jest brana pod uwagę) wybierane są lokalnie najlepsze oraz te, których dopasowanie, mierzone specjalną funkcją, jest powyżej pewnego progu. Metoda została zaimplementowana jako graficzna, wieloplatformowa, przyjazna dla użytkownika aplikacja w języku JAVA. Jej działanie zostało ocenione na rzeczywistych mikroskopowych obraz in-vitro komórek wątroby.
    Źródło:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2008, 3; 23-38
    1644-0331
    Pojawia się w:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Plasma-Focus discharges within the PF-360 facility equipped with needle D2O-ice target
    Autorzy:
    Baranowski, J.
    Jakubowski, L.
    Sadowski, M.
    Zebrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147583.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cryogenic target
    current sheath
    neutrons yield
    plasma focus
    X-ray
    Opis:
    The paper describes a new technique which has been investigated in order to overcome the neutron saturation effect and to increase the neutron yield from the plasma-focus (PF) discharges [1]. The PF-360 experimental facility was constructed at the Andrzej Soltan Institute for Nuclear Studies (IPJ) in Swierk, Poland in the late 70s [4, 5]. Recently in order to improve the neutron yield from the PF-360 machine, it was proposed to use a cryogenic deuterium target, which might be placed within the plasma-focus region. For this purpose, we have been made a needle-like cryogenic target covered with a thin „heavy-ice“ layer. A considerable increase in the average neutron yield (from 1.7×1010 to about 2.2×1010 neutrons/shot) has been achieved for 122 kJ PF discharges when the needle target top was placed at a distance of about 100 mm from the electrode ends.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 69-71
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of the neutron emission from PF-360 facility operated without and with solid-state targets
    Autorzy:
    Czaus, K.
    Baranowski, J.
    Sadowski, M.
    Skladnik-Sadowska, E.
    Zebrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146908.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    anisotropy
    beam-target mechanism
    dense plasma focus (DPF)
    neutron yield
    thermal mechanism
    Opis:
    The paper reports on detailed studies of an anisotropy of the fusion-produced neutrons emitted from the modernized PF-360 facility [10], which has been operated with a pure deuterium-gas filling, without and with some additional solidstate targets containing deuterium atoms. Under standard operational conditions, anisotropy of the neutron yield from the PF-360 facility is similar to that observed in other PF devices. For the first time the neutron emission anisotropy has been measured in the PF experiments performed with a planar cryogenic target covered with a heavy-ice (D2O) layer. Changes in the Yn(Φ)/Yn(90°) ratio, particularly for angles Φ = 0–60°, have been explained by the known features of the angular distribution of fast deuterons.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 77-80
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modification of plasma-sprayed alumina deposits by high-energy ion beams
    Autorzy:
    Sadowski, M.
    Langner, J.
    Stanisławski, J.
    Matejícek, J.
    Kolman, B.
    Chráska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146704.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alumina coatings
    plasma-ion streams
    plasma spraying
    surface modification
    Opis:
    This paper reports on characteristics of alumina-type coatings deposited on steel substrates and treated with pulsed plasma streams containing high-energy ion beams (N, Ar, and Ti+N). Originally matted surfaces of the ceramic layers, which were created by plasma spraying of gray alumina, were changed into shiny ones, and splat boundaries disappeared due to the melting of a thin surface layer. The thickness of this modified layer did not exceed 1 žm. A higher content of Ti was found on the surfaces of the Ti- and N-treated samples only.
    Źródło:
    Nukleonika; 2000, 45, 3; 199-202
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some problems of plasma-material interactions in fusion devices
    Autorzy:
    Glazunov, G.
    Volkov, E.
    Lapshin, V.
    Tereshin, V.
    Sadowski, M.
    Langner, J.
    Stanisławski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146712.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    boron-carbide erosion
    plasma-material interaction
    TiN-coated stainless-steel
    Opis:
    The paper concerns some questions connected with the interaction of high-temperature plasma-ion fluxes with solid materials inside experimental chambers used for fusion-oriented research, and particularly inside the Torsatron-type facilities. Mechanisms of the boron carbide erosion are described and discussed. Also described is the behaviour of TiN-coated stainlesssteel surfaces under the irradiation with hydrogen plasma-ion fluxes. In summary, there are described damages in the boron carbide layers and changes in the composition of the TiN-coatings.
    Źródło:
    Nukleonika; 2000, 45, 3; 209-213
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of characteristics of pulsed ion beams emitted from different small PF devices
    Autorzy:
    Sadowski, M.
    Skladnik-Sadowska, E.
    Baranowski, J.
    Zebrowski, J.
    Kelly, H.
    Lepone, A.
    Marquez, A.
    Milanese, M.
    Moroso, R.
    Pouzo, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146809.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Faraday cups
    ion beams
    plasma focus
    Thomson analyzers
    track detectors
    Opis:
    The paper concerns studies of pulsed ion beams emitted from different small-energy (5–50 kJ) devices of the plasma focus (PF) type. Emission characteristics of the ion beams as measured with nuclear track detectors (NTDs), Faraday-type collectors (FC), and Thomson-type analyzers, are summarized. Common features of the ion emission are considered and some differences are discussed.
    Źródło:
    Nukleonika; 2000, 45, 3; 179-184
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of corpuscular emission from the Prague Capillary Pinch
    Autorzy:
    Skladnik-Sadowska, E.
    Baranowski, J.
    Sadowski, M.
    Kolácek, K.
    Ripa, M.
    Ctibor, P.
    Kishinets, A.
    Rupasov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147142.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    capillary pinch
    corpuscular flux
    track detectors
    X-radiation
    Opis:
    The paper presents results of preliminary measurements of the corpuscular radiation from fast z-pinch discharges, which were performed at the Prague Capillary Pinch facility within a frame of the Czech-Polish scientific collaboration programme. Time-integrated measurements were performed by means of a pinhole camera, equipped with nuclear track detectors of the CR-39 type. In order to perform time-resolved measurements the use was made of a single Faraday-type collector and a double-cup system. It was demonstrated that the fast capillary discharges can emit not only pulses of intense visible radiation and soft X-rays, but also pulses of the corpuscular radiation. An optical analysis of the particle tracks was performed. The particle flux at a distance of 20 cm from the collimator outlet was estimated to be 3.5×107 particles/cm2.
    Źródło:
    Nukleonika; 2002, 47, 1; 31-37
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Status of a mega-joule scale Plasma-Focus experiments
    Autorzy:
    Scholz, M.
    Bieńkowska, B.
    Borowiecki, M.
    Ivanova-Stanik, I.
    Karpiński, L.
    Stępniewski, W.
    Paduch, M.
    Tomaszewski, K.
    Sadowski, M.
    Szydłowski, A.
    Kubeš, P.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147496.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    dense magnetized plasma
    neutron yield
    Opis:
    This paper presents results of the recent plasma-focus (PF) experiments carried out with PF facilities, which was operated at energies ranging from 0.5 MJ to about 1 MJ. Particular attention has been paid to pinch evolution, the emission of pulsed X-ray, fast electron beams, and fusion produced neutrons. Some theoretical models of the initial breakdown, which occurs at the insulator surface, are compared. It is pointed out that modeling of the breakdown is sensitive to kinetics of ionization processes and transport coefficients. Progress in experimental studies of the axial acceleration phase is unsatisfactory. Important experimental data have been collected, but new measurements are still needed. For the radial collapse phase, it was shown that the MHD modeling is efficient until the maximum compression, but plasma instabilities require more sophisticated approaches. The pinch phase was investigated by means of different diagnostics. Fusion neutron yields were measured in different experiments, but some discrepancies in scaling must still be explained. The conclusions concern directions for further studies and optimization of large-scale high-current PF facilities.
    Źródło:
    Nukleonika; 2006, 51, 1; 79-84
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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