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    Wyświetlanie 1-5 z 5
    Tytuł:
    Optical Emission Spectroscopy of Microwave (915 MHz) Plasma in Atmospheric Pressure Nitrogen with Addition of Ethanol Vapour
    Autorzy:
    Miotk, R.
    Jasiński, M.
    Mizeraczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366270.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.50.Sw
    52.70.Kz
    Opis:
    In this paper results of optical emission spectroscopic study of microwave 915 MHz plasma in atmospheric pressure nitrogen with an addition of ethanol vapour are presented. The plasma was generated in waveguide-supplied cylinder-type nozzleless microwave plasma source. The aim of research was to determine the rotational $T_{rot}$ and vibrational $T_{vib}$ temperatures of CN and $C_2$. A method called bubbling was employed to introduce alcohol (ethanol) into the plasma. The $T_{rot}$ and $T_{vib}$ were determined by comparing the measured and simulated spectra. Obtained rotational and vibrational temperatures of CN and $C_2$ were ranged from 4400 to 5400 K and from 2800 to 3400 K, respectively, depending on the location in the plasma and the microwave absorbed power $P_{A}$.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1329-1331
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dedicated system for design, analysis and optimization of AC-DC converters
    Autorzy:
    Piasecki, S.
    Szmurlo, R.
    Rabkowski, J.
    Jasiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201404.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC-DC converter
    multi-objective optimization
    design methodology
    distributed generation systems
    konwerter AC-DC
    optymalizacja wielokryterialna
    metodologia projektowania
    generacja rozproszona
    Opis:
    This paper presents an originally-developed system for design and optimization of AC-DC converters dedicated in particular to operation in distributed generation systems. The proposed procedure is based on a multi-objective discrete optimization and expert knowledge of electrical engineering, especially power electronics. The required accuracy of calculations is obtained by using the database with real components, while the parameters applied in calculations are based on parameters provided by the manufacturer. The paper presents the foundations and basic system properties, the design and optimization process, and selected optimization results, obtained with a fully functional prototype of the design and optimization system (DaOS).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 897-905
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave plasma for hydrogen production from liquids
    Autorzy:
    Czylkowski, D.
    Hrycak, B.
    Miotk, R.
    Jasiński, M.
    Mizeraczyk, J.
    Dors, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148564.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dry reforming
    ethanol
    hydrogen production
    isopropanol
    kerosene
    microwave plasma
    Opis:
    The hydrogen production by conversion of liquid compounds containing hydrogen was investigated experimentally. The waveguide-supplied metal cylinder-based microwave plasma source (MPS) operated at frequency of 915 MHz at atmospheric pressure was used. The decomposition of ethanol, isopropanol and kerosene was performed employing plasma dry reforming process. The liquid was introduced into the plasma in the form of vapour. The amount of vapour ranged from 0.4 to 2.4 kg/h. Carbon dioxide with the fl ow rate ranged from 1200 to 2700 NL/h was used as a working gas. The absorbed microwave power was up to 6 kW. The effect of absorbed microwave power, liquid composition, liquid fl ow rate and working gas fl ow rate was analysed. All these parameters have a clear infl uence on the hydrogen production effi ciency, which was described with such parameters as the hydrogen production rate [NL(H2)/h] and the energy yield of hydrogen production [NL(H2)/kWh]. The best achieved experimental results showed that the hydrogen production rate was up to 1116 NL(H2)/h and the energy yield was 223 NL(H2) per kWh of absorbed microwave energy. The results were obtained in the case of isopropanol dry reforming. The presented catalyst-free microwave plasma method can be adapted for hydrogen production not only from ethanol, isopropanol and kerosene, but also from different other liquid compounds containing hydrogen, like gasoline, heavy oils and biofuels.
    Źródło:
    Nukleonika; 2016, 61, 2; 185-190
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medical students’ perceptions of people with disabilities
    Autorzy:
    Guzowski, A.
    Kułak-Bejda, A.
    Stelcer, B.
    Jasiński, M.
    Łukaszuk, C.R.
    Cybulski, M.
    Kułak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918400.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Medical students
    attitudes
    people with disabilities
    life satisfaction
    empathy
    Opis:
    Introduction: Little is known about associations of attitudes of medical students towards people with disabilities and their life satisfaction and empathy. Purpose: To assess the social perception of people with disabilities by medical students. Materials and methods: The present study interviewed 451 medical students of the Medical University of Białystok regarding their perceptions of people with disabilities, especially in light of their own satisfaction with life and empathy. We used the following questionnaires: the original questionnaire about attitudes towards people with disabilities, The Satisfaction with Life Scale (SWLS), and Empathy Understanding Questionnaire (KRE). Results: Attitudes towards people with disabilities people were generally positive. Almost 40% of respondents expressed a willingness to help for people with disabilities. In general, disabled people do not have full access to all fields of social (63.4%) and professional (63.2%) life. At the same time, disabled people tend to marry (84.9%), have children (82.1%), work (88.2%), and drive cars (76.1%). Respondents were convinced that contact with a disabled person teaches ways to help others (42.1%), and in fact 58.6% of respondents reported having decided to participate with helping the disabled. The average life satisfaction of the students was 22.7 ± 5.3 which indicates that the respondents are satisfied with their lives. The empathy level of respondents was 66.97 points ± 2.98, which indicates average level of empathy. Conclusions: This study shows that students’ perception of people with disabilities depends upon how the students viewed disabled people’s, life satisfaction and empathy.
    Źródło:
    Progress in Health Sciences; 2016, 6(2); 125-131
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method
    Autorzy:
    Zybała, R.
    Schmidt, M.
    Kaszyca, K.
    Chmielewski, M.
    Kruszewski, M. J.
    Jasiński, M.
    Rajska, M.
    Ciupiński, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/200831.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    nanostructured materials
    skutterudite
    energy harvesting
    spark plasma sintering
    Opis:
    One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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