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    Wyświetlanie 1-7 z 7
    Tytuł:
    Connectivity Solutions in Automated Trading
    Autorzy:
    Popławski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226896.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    telecommunications
    digital systems
    systems architecture
    automated trading
    high frequency trading
    Opis:
    The study analyzes the architecture and deployment of direct market access (DMA) solutions for automated trading of securities. It provides an overview of automated trading systems including: trading floor architecture, trading environment connectivity, and DMA solutions. Among a range of factors influencing operational capacities, round-trip latency has been recognized as the key quality differentiator of an automated trading floor. The study identifies potential opportunity costs due to latency levels as a major driver of technological progress in trading in highly liquid market conditions.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 4; 403-408
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of efficiency of extraction of built-up areas in aerial images using fractal analysis and morphological granulometry
    Porównanie efektywności wyodrębniania terenów zabudowanych na obrazach lotniczych przy pomocy analizy fraktalnej i granulometrii morfologicznej
    Autorzy:
    Kupidura, P.
    Popławski, W.
    Sitko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/132365.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    remote sensing
    mathematical morphology
    fractal analysis
    classification
    digital image processing
    teledetekcja
    morfologia matematyczna
    analiza fraktalna
    klasyfikacja
    cyfrowe przetwarzanie obrazów
    Opis:
    The paper presents a comparison of results of the automatic extraction of built-up areas, based on fractal analysis and granulometric maps, in the aerial images. Built-up areas as a land-use class can be clearly seen in an aerial or satellite image, due to its high granularity, but for the same reason they are very difficult to extract using a “traditional” non-contextual, pixel-based classification. Both approaches presented in the paper, using fractal analysis and morphological granulometry, base generally on a pixel-based classification, but performed on images reviously processed using these two types of processes. Fractal analysis consists in an empirical computing of fractal dimension of parts of an image, using a box-counting method. Such an approach generates an image where pixel values are equal to a fractal dimension values of their neighbourhood. Since we can interpret a fractal dimension as a level of granularity, a simple reclassification of such an image can improve a performance of an automatic extraction of built-up area effectively. The approach based on a morphological granulometry creates a number of granulometric maps – images where pixel values mean an amount of objects of certain size in a set neighbouring fragment of an image. This way a number of these images can be processed using a pixel-based classification, to perform an effective extraction of built-up areas in an image. The results of the presented approaches have been compared to the reference mask obtained basing on a visual interpretation of the image.
    Źródło:
    Teledetekcja Środowiska; 2015, 52; 29-37
    1644-6380
    Pojawia się w:
    Teledetekcja Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of true stress in engineering materials using optical deformation measurement methods
    Autorzy:
    Bogusz, P.
    Popławski, A.
    Morka, A.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/241743.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    true stress
    optical deformation measurement
    experimental studies
    FEM
    steel
    Opis:
    The aim of the paper is to evaluate a method of determining true stress in the steel sample subjected to static axial tensile on a universal testing machine. The tensile specimens were made of steel ST3, which was chosen because of its relatively high plastic deformations. Strain measurement was performed using traditional extensometers and additionally a non-contact optical deformation measuring system. Material properties were obtain by the extensometer measurements. The optical equipment registered the investigated sample through the optical system composed of two cameras and calculated a three-dimensional model of the material deformation in time. Displacement fields in axial and radial directions were determined with Digital Image Correlation method (DIC). Then the logarithmic axial strain map and radius shrinkage map in the area of the neck were obtained. Characteristic dimensions of the neck: curvature and width were also measured. It allowed determination of cross-section area changes in the real time, and in the result, calculation of actual true stress in the material during failure process. In this case Bridgman's and other scientists' formulas of stress distribution in the neck were applied. A numerical model, where material properties of finite elements were described by the Johnson-Cooke material model, was developed in LS-PrePost software. The FEM model was computed in LS-DYNA solver. The output tensile curve and neck curvature radius were compared with relevant data obtained from the optical measuring system.
    Źródło:
    Journal of KONES; 2012, 19, 4; 53-64
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical investigation of energy absorption elastomer panel with honeycomb structure
    Autorzy:
    Bogusz, P.
    Popławski, A.
    Morka, A.
    Stankiewicz, M.
    Sławiński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/246847.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    energy absorption structure
    blast shock wave
    numerical modelling
    elastomer
    validation
    Opis:
    The paper presents a prototype design of elastomer energy absorbing panel made in a shape of honeycomb structure. The proposed panel was installed in a protected plate and tested on a specially designed test stand, where a shock wave from a small explosive charge was applied. The elastomer honeycomb structure was compared with a version of the panel made of solid elastomer materials, the same as used in the honeycomb structure and also with a protected plate without any panels. During the research, acceleration in the middle part of each investigated protected plate was recorded. The protected plates were scanned after the tests in order to measure their maximum deformation. Acceleration graphs and maximum deflections of all three considered structures were compared. The obtained results were used to validate numerical models of the designed structures and the test stand. A discreet model of the test stand and models of elastomer panels were developed with HyperMesh FEM software using shell and solid elements. The materials were described using a tabulated Johnson-Cook model and constitutive model for the rubber parts; all available in the material library of Ls-Dyna software. The blast loading was simulated using the CONWEP method. This model generates a boundary condition, based on the experimental data and TNT equivalent mass, which substitutes the wave propagation with a pressure. Finally, the experimental results of acceleration and deformation of the plates were compared with the corresponding results of the numerical analyses carried out using finite element method. The numerical models can be utilised in the future research as a virtual range stand. The developed elastomer honeycomb structure can be modified to meet various requirements of ballistic protection levels, by applying elastomer of different stiffness or optimizing shape and dimensions of the honeycomb structure.
    Źródło:
    Journal of KONES; 2015, 22, 4; 29-36
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental evaluation of energy absorbing properties of selected elastomer materials
    Autorzy:
    Stankiewicz, M.
    Popławski, A.
    Bogusz, P.
    Gieleta, R.
    Sławiński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/247562.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    material research
    experiment
    elastomers
    polyurethanes
    energy absorption properties
    Opis:
    The paper presents identifying studies of mechanical properties of the selected materials from the group of elastomers including Asmathane (65 ShA), Easyprene FPS (30 ShA), Biresin (U1305). The tests were carried out at the Laboratory of Strength of Materials, the Department of Mechanics and Applied Computer Science, with the use of an especially designed stand for testing the energy absorption of materials. The research aims were to determine the basic properties and characteristics of the selected materials as well as to compare them and identify the material with the best energy-absorbing characteristics. For a single load-unload cycle, applied dynamically, the hysteresis loops were recorded. Energy-absorption of individual materials and maximum strength were determined. During the experimental test, a fast speed camera was used for accurately register the progress performance of the test. The pictures of the dynamic tests of materials behaviour are shown. The curves of the tested materials are compared in the graphs. The resulting data will help to create constitutive models of the tested materials, which in the next stages of the project will be used in numerical studies on the impact of detonation on the designed protective panel.
    Źródło:
    Journal of KONES; 2015, 22, 3; 241-248
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ammonia as a sustainable fuel
    Amoniak jako zrównoważone paliwo
    Autorzy:
    Grzesiak, D.
    Kędzior, R.
    Popławski, D.
    Hałat, A.
    Falewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/388585.pdf
    Data publikacji:
    2015
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    ammonia flammability
    burning ammonia-air mixtures
    laminar burning velocity
    palność amoniaku
    spalanie mieszanki amoniak-powietrze
    prędkość spalania laminarnego
    Opis:
    An ammonia evaluation as a potential sustainable fuel in comparison with other fuels was made. Values of laminar burning velocity ammonia at ambient and elevated temperatures 20, 100, 200, 250 oC and pressure 100 and 500 kPa using the data from SAFEKINEX project were estimated.
    W pracy dokonano oceny przydatności amoniaku jako potencjalnego paliwa w odniesieniu do paliw konwencjonalnych. Wykorzystując dane z projektu SAFEKINEX, oszacowano także wartości prędkości spalania laminarnego amoniaku w temperaturze 20, 100, 200, 250 oC przy ciśnieniu 100 i 500 kPa.
    Źródło:
    Ecological Chemistry and Engineering. A; 2015, 22, 3; 393-401
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PRRT as an alternative method of treatment in patient with glucagonoma syndrome: A case report
    Autorzy:
    Popławska-Kita, A.
    Szyszkowska, A.
    Brelska, P.
    Kowalczuk, M.
    Szostek, A.
    Popławski, Ł.
    Siewko, K.
    Szelachowska, M.
    Kamiński, G.
    Werel, D.
    Górska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917699.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Glucagonoma
    tumor
    peptide receptor radionuclide therapy
    Opis:
    Introduction: Glucagonoma is a rare pancreatic neuroendocrine tumor derived from alpha-cells of the islet of Langerhans. Due to oversecretion of glucagon it is associated with a characteristic paraneoplastic phenomenon, called glucagonoma syndrome, which consists of necrolytic migratory erythema (NME), weight loss, diabetes mellitus, diarrhea, normochromic normocytic anemia, deep vein thrombosis or pulmonary embolism and neuropsychiatric disturbances. Treatment modalities include surgical removal of tumor, somatostatin analogs and peptide receptor radionuclide therapy (PRRT). Case report: We present a case of 61-year-old woman diagnosed with glucagonoma in April 2012. Initially, body-caudal pancreatomy and resection of regional lymph nodes were performed. Five months after surgery, a PET-CT scan detected pathological mass with expression of somatostatin receptors in pancreatic body and metastases to regional lymph nodes. What is more, since April 2014 the patient had complained about persistent pruritus of the entire body. At present, due to the nonsurgical pancreatic mass and metastases she is treated with somatostatin analogs and PRRT. During this therapy the pruritus had decreased and currently there is no sign of cutaneous disease. Moreover, reduction of tumor size was obtained. Conclusions: PRRT may reduce tumor size and by reducing bothersome symptoms substantially improve the quality of life in patients with SSTR-positive tumors
    Źródło:
    Progress in Health Sciences; 2016, 6(1); 209-214
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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