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    Wyświetlanie 1-7 z 7
    Tytuł:
    Wspomagana komputerowo ocena własności polaryzacyjnych elementów światłowodowych
    Computer-aided evaluation of polarization properties of optical elements
    Autorzy:
    Sulej, W.
    Marć, P.
    Szymański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/153703.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    włókno światłowodowe
    polaryzacja
    macierz Muellera
    GPIB
    optical fibre
    polarization
    Mueller matrix
    NI-VISA
    Opis:
    W artykule przedstawiono metodologię i wyniki pomiarów macierzy Muellera wybranych włókien światłowodowych zrealizowanych z wykorzystaniem autorskiego, specjalistycznego oprogramowania sterującego. Oprogramowanie to umożliwia zdalny i szybki pomiar oraz automatyczne wyznaczenie interesujących wielkości fizycznych opisujących badane włókna. Pomiar macierzy Muellera przeprowadzano w konfiguracji układowej: źródło światła, specjalizowany światłowodowy generator stanu polaryzacji, badane włókno oraz polarymetr z wejściem światłowodowym.
    The rapid development of telecommunication and sensor technology requires more comprehensive evaluation of the optical properties of optical components used. At present it seems that in both groups of applications, obtaining information about the polarization properties of fiber-optic components used in an optical path plays an increasing role. This leads to the need for ever more sophisticated measurement techniques in which the key issue is to use a computer performing functions of control, reading and processing data. In this paper a methodology and experimental results of Mueller matrices measurements of optical fibres based on specially designed software are presented. The successive sections present: the theoretical basis of the measurement method, the measurement system, description of the library I/O - VISA and the measurement results. The developed software allows for remote and fast measurements as well as control of all devices in the measurement system. A Mueller matrix was measured based on the following configuration: a laser light source, an optical fibre polarization generator, a tested optical fibre and a polarimeter with an optical fibre adapter (Fig. 1). The presented preliminary results are satisfactory and give a very good perspective for building a measurement system that will allow for automatic characterization of not only the polarization properties of optical fibers, but also passive components made based on them. The described measurement system will be used as a base for developing the system enabling full characterization of fiber optic components with special reference to their polarizing properties.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 11, 11; 1338-1343
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixtures of selected n-alkanes and Au nanoparticels for optical fiber threshold temperature transducers
    Autorzy:
    Przybysz, N.
    Marć, P.
    Tomaszewska, E.
    Grobelny, J.
    Jaroszewicz, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818233.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    optical fiber sensors
    temperature treshold sensors
    gold nanoparticles
    n-alkanes
    photonic crystal transducers
    Opis:
    Thermo-optic properties enhancement of the bi-stable temperature threshold sensors based on a partially filled photonic crystal fiber was reported. Previously tested transducers filled with a selected group of pure n-alkanes had in most cases differences between switching ON and OFF states. Therefore, the modification of filling material by using additional crystallization centers in the form of gold nanoparticles was applied to minimize this undesirable effect. The evaluation of the thermodynamic properties of pentadecane and its mixtures with 14 nm spherical Au nanoparticles based on the differential scanning calorimetry measurements was presented. Optical properties analysis of sensors prepared with these mixtures has shown that they are bounded with refractive index changes of the filling material. Particular sensor switches ON before melting process begins and switches OFF before crystallization starts. Admixing next group of n-alkanes with these nanoparticles allows to design six sensors transducers which change ON and OFF states at the same temperature. Thus, the transducers with a wider temperature range for fiber-optic multi-threshold temperature sensor tests will be used.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 220--228
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE AUTOMOTIVE SECTOR IN SPAIN. INFLUENCE OF R&D INVESTMENT ON THE IMPROVEMENT OF TOTAL FACTOR PRODUCTIVITY
    Autorzy:
    Miró-Pérez, Albert-P.
    Crisóstomo Gálvez, Raquel
    Carreño, Marc Valderrama
    Powiązania:
    https://bibliotekanauki.pl/articles/1818440.pdf
    Data publikacji:
    2020-01-21
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    Automotive Sector
    Total Factor Productivity
    Spain
    Opis:
    The current globalised environment has been preceded by a generalised increase in the diffusion and use of Information and Communication Technologies (ICT), as well as by a large investment in Research and Development (R&D) by companies. This circumstance makes the use of these technologies fundamental for the automotive sector to face with guarantees the growing international competitivity. Thus, the correct use of ICT provides an improvement in productivity, and therefore in the competitiveness of enterprises. This article analyses the evolution of total factor productivity (TFP) in the Spanish automotive sector for the year 2017, in order to determine the influence this variable has on the improvement of total factor productivi
    Źródło:
    Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach; 2019, 49, 122; 55-62
    2082-5501
    Pojawia się w:
    Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies on the reaction of growing geese (Anser anser f. domestica) to the proximity of wind turbines
    Autorzy:
    Mikolajczak, J.
    Borowski, S.
    Marc-Pienkowska, J.
    Odrowaz-Sypniewska, G
    Bernacki, Z
    Siodmiak, J.
    Szterk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/30861.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Wind farms produce electricity without causing air pollution and environmental degradation. Unfortunately, wind turbines are a source of infrasound, which may cause a number of physiological effects, such as an increase in cortisol and catecholamine secretion. The impact of infrasound noise, emitted by wind turbines, on the health of geese and other farm animals has not previously been evaluated. Therefore, the aim of this study was to determine the effect of noise, generated by wind turbines, on the stress parameters (cortisol) and the weight gain of geese kept in surrounding areas. The study consisted of 40 individuals of 5- week- old domestic geese Anser anser f domestica, divided into 2 equal groups. The first experimental gaggle (I) remained within 50 m from turbine and the second one (II) within 500 m. During the 12 weeks of the study, noise measurements were also taken. Weight gain and the concentration of cortisol in blood were assessed and significant differences in both cases were found. Geese from gaggle I gained less weight and had a higher concentration of cortisol in blood, compared to individuals from gaggle II. Lower activity and some disturbing changes in behavior of animals from group I were noted. Results of the study suggest a negative effect of the immediate vicinity of a wind turbine on the stress parameters of geese and their productivity.
    Źródło:
    Polish Journal of Veterinary Sciences; 2013, 16, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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