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    Wyświetlanie 1-6 z 6
    Tytuł:
    Laser based diagnostic system for spray measurements
    Autorzy:
    Kapusta, Ł. J.
    Jaworski, P.
    Teodorczyk, A.
    Kowalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244911.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    spray
    shadowgraphy
    Mie scattering
    LIF
    laser-induced fluorescence
    Opis:
    The paper discusses the capabilities of the laser diagnostic system for dispersed multiphase flows measurements, which was recently commissioned at the Institute of Heat Engineering (ITC) at Warsaw University of Technology. The system presented in the paper is multifunctional and is capable to use different measurements techniques such as shadowgraphy, Mie scattering (scattering on the gas-liquid interface) and LIF (laser induced fluorescence). It provides possibility of switching from one technique to another depending on the characteristics of the observed combustion/injection mixing process. The operational features are discussed in-detail. The study presents the required and possible system setups. Special attention was focused on the system components, which are needed for relevant measurement techniques. Moreover, the limitations of the measurement techniques are discussed and the example measurements are presented. The study shows that using different techniques extends the measurement capabilities of the system with minimum investment costs. This results from the fact that certain system components for different techniques are the same. Moreover, one can conclude that the system design allows certain measurement methods to be applied simultaneously, which results in synergy by making possible drawing more advanced conclusions on observed phenomena
    Źródło:
    Journal of KONES; 2015, 22, 3; 91-98
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of dosimetric peaks of MgB4O7:Dy (40% Tefl on) versus LiF:Mg,Ti TL detectors
    Autorzy:
    Paluch-Ferszt, M.
    Kozłowska, B.
    Oliveira de Souza, S.
    Freire de Souza, L.
    Nascimento Souza, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148068.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    thermoluminescent detectors
    MgB4O7:Dy
    LiF:Mg,Ti
    Opis:
    Magnesium tetraborate doped with dysprosium (MgB4O7:Dy) is known as a good thermoluminophor for personal dosimetry of gamma ray and X-ray radiation because of its high sensitivity and close tissue equivalence. This material can be produced by different routes. The sintered pastilles of magnesium tetraborate mixed with Tefl on (40%) used in this work were manufactured at the Federal University of Sergipe, Department of Physics by the solid-state synthesis. Magnesium tetraborate was already used for high-dose dosimetry, exhibiting linearity for a wide range of doses. In this work, the authors examined its main characteristics prior to potential use of detectors in everyday dosimetry, comparing this material to a widely used LiF:Mg,Ti phosphor. The following tests infl uencing dosimetric peaks of MgB4O7:Dy were presented: (1) the shape of the glow curves, (2) annealing conditions and post-irradiation annealing and its infl uence for background of the detectors, (3) the choice of the heating rates at the read-out and (4) the threshold dose, that is, the lowest possible dose to be measured. Simil ar tests were performed with LiF:Mg,Ti detectors, produced and widely used in Poland. The results were compared and discussed.
    Źródło:
    Nukleonika; 2016, 61, 1; 49-52
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Example of flow modelling characteristics in diesel engine nozzle
    Autorzy:
    Kolaric, D.
    Kolaric, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/197062.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    diesel engine
    mass flow
    CFD
    needle lif
    injector
    silnik wysokoprężny
    przepływ masy
    wtryskiwacz
    Opis:
    Modern transport is still based on vehicles powered by internal combustion engines. Due to stricter ecological requirements, the designers of engines are continually challenged to develop more environmentally friendly engines with the same power and performance. Unfortunately, there are not any significant novelties and innovations available at present which could significantly change the current direction of the development of this type of propulsion machines. That is why the existing ones should be continually developed and improved or optimized their performance. By optimizing, we tend to minimize fuel consumption and lower exhaust emissions in order to meet the norms defined by standards (i.e. Euro standards). Those propulsion engines are actually developed to such extent that our current thinking will not be able to change their basic functionality, but possible opportunities for improvement, especially the improvement of individual components, could be introduced. The latter is possible by computational fluid dynamics (CFD) which can relatively quickly and inexpensively produce calculations prior to prototyping and implementation of accurate measurements on the prototype. This is especially useful in early stages of development or at optimization of dimensional small parts of the object where the physical execution of measurements is impossible or very difficult. With advances of computational fluid dynamics, the studies on the nozzles and outlet channel injectors have been relieved. Recently, the observation and better understanding of the flow in nozzles at large pressure and high velocity is recently being possible. This is very important because the injection process, especially the dispersion of jet fuel, is crucial for the combustion process in the cylinder and consequently for the composition of exhaust gases. And finally, the chemical composition of the fuel has a strong impact on the formation of dangerous emissions, too. The research presents the influence of various volume mesh types on flow characteristics inside a fuel injector nozzle. Our work is based upon the creating of two meshes in the CFD software package. Each of them was used two times. First, a time-dependent mass flow rate was defined at the inlet region and pressure was defined at the outlet. The same mesh was later used to perform a simulation with a defined needle lift curve (and hereby the mesh movement) and inlet and outlet pressure. In next few steps we investigated which approach offered better results and would thus be most suitable for engineering usage.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2016, 90; 123-135
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of LiF : Mg,Cu,P (MCP-N) thermoluminescent detectors (TLD) for experimental verification of radial dose distribution models
    Autorzy:
    Gieszczyk, W.
    Olko, P.
    Bilski, P.
    Grzanka, L.
    Obryk, B.
    Horwacik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/146734.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    heavy charged particles
    LiF:Mg,Cu,P (MCP-N)
    radial dose distribution
    thermoluminescence
    unfolding
    Opis:
    In track structure theory, the radial distribution of dose, D(r), around an ion track plays a fundamental role in predicting the response of biological systems and physical detectors after a dose (or fluence) of ions. According to the formulations of D(r), the local dose at radial distances below 1 nm can reach values as high as 106 Gy. We propose a new method of verifying experimentally the radial dose distribution around alfa-particle tracks, using LiF:Mg,Cu,P (MCP-N) thermoluminescent detectors (TLD) which are able to measure gamma-ray doses in the kGy range via evaluation of their high-temperature TL glow peak structure over the temperature range of 350–550 centigrade. MCP-N detectors were irradiated with Am-241 alfa-particles at fluences ranging from 107 to 1011 particles/cm2, and by Co-60 gamma-ray doses ranging from several Gy up to the MGy. A number N of individual high-temperature TL peaks were analysed in the obtained glow curves by deconvolution, using the GlowFit code. For each of these peaks, an equation relating the intensity, A, of the TL signal obtained after alfa-particle irradiation and after gamma-ray doses, via the dose-frequency function, f alfa(D), was written in the form: A i alfa = integral A i gamma(D)x f alfa (D)dD, i 1,.., N. Using this set of N equations, where A alfa i and A gamma i(D) were known (measured), the single unknown function f alfa(D) was unfolded and converted to D(r). Parametric unfolding and the SAND-II iterative code were applied. While we were able to confirm the 1/r2 dependence of D(r) in agreement with D(r) expressions, we were unable to conclusively evaluate the dependence of D(r) at intermediate ranges of radial distance r. This preliminary result of our unique experimental approach to determine the radial dose distribution around the path of heavy charged particles in LiF detectors, requires further development.
    Źródło:
    Nukleonika; 2012, 57, 4; 507-512
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pobieranie i identyfikacja próbek biologicznych z wykorzystaniem stosowanych w wojsku urządzeń do wykrywania on-site skażeń biologicznych
    Collection and Identification of Biological Samples Based on Military On-Site Detection Devices
    Autorzy:
    Kuligowska, Monika
    Neffe, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2147157.pdf
    Data publikacji:
    2021
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    nauki chemiczne
    broń biologiczna
    bioterroryzm
    CBRN
    PCR
    UV-LIF
    chemical sciences
    biological weapon
    bioterrorism
    Opis:
    Ze względu na wciąż aktualne zagrożenia biologiczne związane z działalnością ugrupowań terrorystycznych, sytuacjami kryzysowymi w wielu rejonach świata, a także cyklicznie pojawiającymi się epidemiami, szybka i wiarygodna detekcja skażeń biologicznych jest niezbędnym elementem zapewnienia szeroko rozumianego bezpieczeństwa ludności. W pracy poruszono kwestie procedur pobierania i weryfikacji próbek. Skupiono się na technikach przygotowania próbek do analizy, a także wyszczególniono metody analityczne służące do identyfikacji czynników biologicznych. Dodatkowo omówiono technologie on-site zaimplementowane w wojskowych przyrządach do detekcji skażeń biologicznych. Praca umożliwia czytelnikowi zapoznanie się z nowoczesnymi technikami detekcji czynników pochodzenia biologicznego i ich identyfikacji, co stanowi niezbędną wiedzę przy wyborze odpowiedniego sprzętu w zależności od przeznaczenia pododdziału rozpoznania skażeń i postawionego zadania. Wiedza z zakresu pobierania i przygotowania próbek do analizy przyczyni się do zwiększenia umiejętności zespołów pobierania próbek w zakresie takich działań oraz do osiągnięcia wiarygodnych wyników przez zastosowanie odpowiednich procedur i wyeliminowanie możliwości utraty analitu czy nieumyślnego skażenia próbki. Pozwoli to również na zwiększenie bezpieczeństwa na każdym etapie pracy z próbkami biologicznymi. Wszystkie te działania mogą przyczynić się do globalnego zwiększenia bezpieczeństwa ludności.
    Due to still current biological threats related to the activities of terrorist groups, crisis situations in many regions of the world, as well as cyclical epidemics, fast and reliable detection of biological contamination is an essential element of ensuring broadly understood safety of the population. The work deals with the sampling and verification procedures. This paper focuses on sample preparation techniques for analysis and details analytical methods for identifying biological agents. Additionally, on-site technologies implemented in military devices for the detection of biological contamination were discussed. The work enables the reader to get acquainted with modern techniques of detection of factors of biological origin and their identification, which is the knowledge necessary when choosing the appropriate equipment depending on the purpose of the contamination recognition sub-unit and the task at hand. Knowledge of sampling and preparation of samples for analysis will help to increase the skills of the sampling teams and to achieve reliable results by using appropriate procedures and eliminating the possibility of loss of the analyte or inadvertent contamination of the sample. It will also increase safety at every stage of working with biological samples. All these activities can contribute to the global increase in security of the population around the world.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2021, 70, 4; 85--125
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the microstructure of the fuel spray atomized by marine injector
    Autorzy:
    Lewińska, J.
    Kapusta, Ł. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/133889.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine diesel engine
    marine injector
    microstructure spray parameters
    optical method
    LIF/Mie
    okrętowy silnik spalinowy
    wtryskiwacz
    metoda optyczna
    Opis:
    The process of the atomization and formation of the fuel spray can be described by macro- and microstructure parameters. Knowledge of these parameters may be a key information to conduct further optimization of the combustion process. This paper presents the research results of the microstructure parameters of the diesel oil spray atomized with marine engine injector. A measurement technique, named Laser Induced Fluorescence (LIF) in the combination with Mie scattering was used to determine LIF/Mie ratio across the spray. The fuel was injected into a constant volume vessel. LIF and Mie signals were recorded by two cameras at the same time. Nd:YAG pulsed laser was used to create light sheet for spray illumination. Wavelength of λ = 266 nm was used in this study.
    Źródło:
    Combustion Engines; 2017, 56, 2; 120-124
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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