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Wyszukujesz frazę "Malinowski, J. J." wg kryterium: Autor

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    Tytuł:
    Object library of algorithms for dynamic optimization problems; Benchmarking SQP and nonlinear interior point methods
    Autorzy:
    Błaszczyk, J.
    Karbowski, A.
    Malinowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/929795.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    optymalizacja dynamiczna
    programowanie kwadratowe sekwencyjne
    różniczkowanie automatyczne
    obliczenia numeryczne
    analiza danych
    dynamic optimization
    large-scale optimization
    sequential quadratic programming
    nonlinear interior-point methods
    object-oriented numerical computations
    automatic differentiation
    performance data analysis
    Opis:
    The main purpose of this paper is to describe the design, implementation and possibilities of our object-oriented library of algorithms for dynamic optimization problems. We briefly present library classes for the formulation and manipulation of dynamic optimization problems, and give a general survey of solver classes for unconstrained and constrained optimization. We also demonstrate methods of derivative evaluation that we used, in particular automatic differentiation. Further, we briefly formulate and characterize the class of problems solved by our optimization classes. The solution of dynamic optimization problems with general constraints is performed by transformation into structured large-scale nonlinear programming problems and applying methods for nonlinear optimization. Two main algorithms of solvers for constrained dynamic optimization are presented in detail: the sequential quadratic programming (SQP) exploring the multistage structure of the dynamic optimization problem during the solution of a sequence of quadratic subproblems, and the nonlinear interior-point method implemented in a general-purpose large-scale optimizer IPOPT. At the end, we include a typical numerical example of the application of the constrained solvers to a large-scale discrete-time optimal control problem and we use the performance profiles methodology to compare the efficiency and robustness of different solvers or different options of the same solver. In conclusions, we summarize our experience gathered during the library development.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 515-537
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal Pump Scheduling for Large Scale Water Transmission System by Linear Programming
    Autorzy:
    Błaszczyk, J.
    Karboński, A.
    Krawczyk, K.
    Malinowski, K.
    Allidina, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/309318.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    linear programming
    minimum cost operative planning
    pump scheduling
    water supply
    Opis:
    Large scale potable water transmission system considered in this paper is the Toronto Water System, one of the largest potable water supply networks in North America. The main objective of the ongoing Transmission Operations Optimizer project consists in developing an advanced tool for providing such pumping schedules for 153 pumps, that all quantitative requirements with respect to the system operation are met, while the energy costs are minimized. We describe here a linear, so-called SimplifiedModel (SM), based on mass-balance equations, which is solved on week horizon and delivers boundary conditions for so-called Full Model (FM), which is nonlinear and takes into account hydraulic phenomena and water quality.
    Źródło:
    Journal of Telecommunications and Information Technology; 2012, 3; 91-96
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on spatial and energetic characteristics of the ion beams emitted in the PF - 360 discharges
    Autorzy:
    Kwiatkowski, R.
    Skladnik-Sadowska, E.
    Malinowski, K.
    Sadowski, M. J.
    Czaus, K.
    Zebrowski, J.
    Garkusha, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147918.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ion beams
    PF-360 facility
    ion pinhole images
    Opis:
    Experimental results are presented on the spatial structure and energetic characteristics of the fast ion beams produced by high-current discharges in a PF-360 device operated at the National Centre for Nuclear Research (NCBJ, Otwock/Świerk, Poland). The 105 kJ discharges were initiated at the initial deuterium pressure around p0 = 6 hPa and were powered from a 234 miF capacitor bank charged up to 30 kV. The spatial structure of the ion beams was recorded using pinhole cameras equipped with the solid-state nuclear track detectors of the PM-355 type, placed at two different angles (0 centigrade, 45 centigrade) relative to the discharge axis. The detectors were shielded by thin absorption filters made of pure Al foils of various thickness, which made it possible to record only ions with energies exceeding a chosen threshold value. Similarly as in other plasma focus (PF) experiments, energies of the emitted ions ranged from about 30 keV to about 3 MeV, i.e. they were much higher than the voltage applied to the electrodes. The recorded ion images showed a complex spatial structure of the fast ion beams, which consisted of many micro-beams of different energies. It is possible that these beams were emitted by various local micro-sources (e.g. plasma micro-diodes) the were formed inside the PF pinch column.
    Źródło:
    Nukleonika; 2012, 57, 1; 67-74
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time - and space - resolved measurements of high - energy ion beams emitted from PF - type discharges
    Autorzy:
    Kwiatkowski, R.
    Sadowski, M. J.
    Skladnik-Sadowska, E.
    Zebrowski, J.
    Malinowski, K.
    Czaus, K.
    Garkusha, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147518.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ion beams
    miniature scintillation detectors
    PF-360 facility
    Opis:
    The paper presents experimental studies of the spatial-microstructure and temporal-characteristics of fast ion beams, which are emitted from high-current plasma-focus (PF) discharges performed within the PF-360 facility at National Centre for Nuclear Research (NCBJ) at Otwock/Świerk, Poland. The spatial structure of the ion beams was investigated by means of pinhole cameras equipped with solid-state nuclear track detectors shielded by absorption filters made of Al-foils of different thickness. In order to perform time-resolved measurements there were applied miniature scintillation detectors placed at different points of the ion-image plane.
    Źródło:
    Nukleonika; 2012, 57, 2; 211-214
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of ISTTOK runaway - electrons energies by means of a Cherenkov - type probe with modified AlN radiators
    Autorzy:
    Jakubowski, L.
    Plyusnin, V. V.
    Sadowski, M. J.
    Zebrowski, J.
    Malinowski, K.
    Rabiński, M.
    Fernandes, H.
    Silva, C.
    Duarte, P.
    Jakubowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147516.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ISTTOK
    runaway electrons
    Cherenkov detector
    AlN radiators
    Opis:
    Measurements of fast electrons, as performed during recent few years in small tokamaks, demonstrated that detectors based on the Cherenkov effect are very useful tools for such studies. The modernized measuring heads, which were equipped with miniature aluminum-nitride (AlN) radiators, enabled to determine locations and instants of the fast electrons emission and to estimate their energy. A comparison of four measuring channels showed that in ISTTOK the most important role was played by electrons of energy less than 90 keV.
    Źródło:
    Nukleonika; 2012, 57, 2; 177-181
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of electron and ion beams emitted from the PF-1000 device in the upstream and downstream direction
    Autorzy:
    Kwiatkowski, R.
    Skladnik-Sadowska, E.
    Malinowski, K.
    Sadowski, M. J.
    Czaus, K.
    Zebrowski, J.
    Karpinski, L.
    Paduch, M.
    Scholz, M.
    Garkusha, I. E.
    Kubeš, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146626.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam (EB)
    ion beams
    PF-1000 facility
    magnetic analyzer
    ion pinhole cameras (IPC)
    Opis:
    In this paper we report on measurements of the energy spectra and other properties of the electron and fast ion beams emitted in the upstream and downstream direction along the z-axis of a large plasma focus device PF-1000, that was operated at 21-27 kV, delivering 290–480 kJ pulse. Measurements of the electron beam (EB) properties were performed using a magnetic analyzer. Properties of the ion beams were measured by means of pinhole cameras equipped with PM-355 nuclear track detectors and placed at various angles (0, 60 and 180 centigrade) to the discharge axis. Measurements revealed a complex spatial structure of the fast ion beams. The ion measurements behind the PF-1000 collector proved that some fast deuterons are emitted also in the upstream direction. Measurements of the EBs emitted in the upstream and downstream direction revealed electron energies in the range from approximately 40 keV to approximately 800 keV. These spectra confirm that in localized regions within the PF-1000 plasma column there appear strong fields accelerating charged particles in different directions along the discharge axis.
    Źródło:
    Nukleonika; 2011, 56, 2; 119-123
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical emission spectroscopy of plasma produced from tungsten target irradiated within RPI - IBIS facility
    Autorzy:
    Skladnik-Sadowska, E.
    Malinowski, K.
    Sadowski, M. J.
    Nowakowska-Langier, K.
    Ladygina, M. S.
    Garkusha, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147510.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    optical spectroscopy
    free plasma stream
    RPI - IBIS facility
    plasma interaction with tungsten
    Opis:
    The paper presents recent research on characteristics of deuterium plasma streams generated within an RPI-IBIS (multi-rod plasma injector) facility, and optical spectra of plasma produced during the interaction of these streams with a tungsten target placed at a distance of 20 cm from the electrode outlets. Distinct WI- and WII-lines were recorded and the noticeable erosion of the W-target was observed for shots delivering more than 4 J/cm2 on the target surface.
    Źródło:
    Nukleonika; 2012, 57, 2; 193-196
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical emission spectroscopy of plasma streams in PF-1000 experiments
    Autorzy:
    Jakubowska, K.
    Kubkowska, M.
    Skladnik-Sadowska, E.
    Malinowski, K.
    Marchenko, A. K.
    Paduch, M.
    Sadowski, M. J.
    Scholz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146628.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    optical emission spectroscopy
    deuterium Balmer series
    Ar II lines
    electron density
    Boltzmann plot
    Opis:
    The optical spectroscopy in the visible range was used to determine properties of the dense magnetized plasma generated in the PF-1000, a 1 MJ plasma focus device operating in the Institute of Plasma Physics and Laser Microfusion (IPPLM) in Warsaw, Poland. The experiments were performed in a vacuum chamber pumped out to the basic pressure of 2 x 10.5 hPa. The initial pressure of the pure deuterium filling was 2.9 hPa, while that of the deuterium--argon mixture was 1.07 hPa of D2 and 0.13 hPa of Ar. The deuterium-plasma emission contained the Balmer series (Dalfa, Dbeta and Dgamma) and a few distinct copper (Cu I) lines originating from the inner electrode material. The emission of the deuterium-argon plasma was rich in Ar II lines. The electron density (ne), averaged over line of sight, of order of 1016 cm.3 was calculated on the basis of the Dalfa and Dbeta emission only, because the D�ż line was strongly self-absorbed. A group of the Ar II spectral lines was used to estimate the excitation temperature (Texc = 3 eV) by means of a Boltzmann plot. Additionally, the temporal evolution of the electron density was determined on basis of the Stark broadening of the Dalfa and Dgamma lines.
    Źródło:
    Nukleonika; 2011, 56, 2; 125-129
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of optical spectra recorded during DPF-1000U plasma experiments with gas-puffing
    Autorzy:
    Zaloga, D. R.
    Skladnik-Sadowska, E.
    Kubkowska, M.
    Ladygina, M. S.
    Malinowski, K.
    Kwiatkowski, R.
    Sadowski, M. J.
    Paduch, M.
    Zielinska, E.
    Makhlaj, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147780.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron density
    gas-puff
    optical spectrum
    plasma focus
    plasma stream
    Opis:
    The results are presented of the optical spectra measurements for free plasma streams generated with the use of the modifi ed DPF-1000U machine. This facility was recently equipped with a gas injection system (the so-called gas-puff) placed on the symmetry axis behind the central opening in the inner electrode. The DPF-1000U experimental chamber was fi lled up with pure deuterium at the initial pressure of 1.6 or 2.4 mbar. Additionally, when the use was made of the gas-puff system about 1 cm3 of pure deuterium was injected at the pressure of 2 bars. The gas injection was initiated 1.5 or 2 ms before the triggering of the main discharge. The investigated plasma discharges were powered from a condenser bank charged initially to 23 kV (corresponding to the energy of 352 kJ), and the maximum discharge current amounted to about 1.8 MA. In order to investigate properties of a dense plasma column formed during DPF-1000U discharges the use was made of the optical emission spectroscopy. The optical spectra were recorded along the line of sight perpendicular to the vacuum chamber, using a Mechelle®900 spectrometer. The recent analysis of all the recorded spectra made it possible to compare the temporal changes in the electron density of a freely propagating plasma stream for discharges without and with the gas-puffing. Using this data an appropriate mode of operation of the DPF-1000U facility could be determined.
    Źródło:
    Nukleonika; 2015, 60, 2; 309-314
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of tungsten surface interaction with plasma streams at DPF-1000U
    Autorzy:
    Ladygina, M. S.
    Skladnik-Sadowska, E.
    Zaloga, D. R.
    Malinowski, K.
    Sadowski, M. J.
    Kubkowska, M.
    Kowalska-Strzeciwilk, E.
    Paduch, M.
    Zielinska, E.
    Miklaszewski, R.
    Garkusha, I. E.
    Gribkov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147638.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DPF-1000U
    electron density
    gas puffing
    plasma stream
    tungsten
    Opis:
    In this note experimental studies of tungsten (W) samples irradiated by intense plasma-ion streams are reported. Measurements were performed using the modified plasma focus device DPF-1000U equipped with an axial gas-puffing system. The main diagnostic tool was a Mechelle®900 optical spectrometer. The electron density of a freely propagating plasma stream (i.e., the plasma stream observed without any target inside the vacuum chamber) was estimated on the basis of the half-width of the Dβ spectral line, taking into account the linear Stark effect. For a freely propagating plasma stream the maximum electron density amounted to about 1.3 × 1017 cm–3 and was reached during the maximum plasma compression. The plasma electron density depends on the initial conditions of the experiments. It was thus important to determine first the plasma flow characteristics before attempting any target irradiation. These data were needed for comparison with plasma characteristics after an irradiation of the investigated target. In fact, spectroscopic measurements performed during interactions of plasma streams with the investigated W samples showed many WI and WII spectral lines. The surface erosion was determined from mass losses of the irradiated samples. Changes on the surfaces of the irradiated samples were also investigated with an optical microscope and some sputtering and melting zones were observed.
    Źródło:
    Nukleonika; 2015, 60, 2; 293-296
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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