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    Wyświetlanie 1-3 z 3
    Tytuł:
    Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser
    Autorzy:
    Xu, L.
    Zhou, S.
    He, T.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/173669.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    external cavity quantum cascade laser
    ECQCL
    quartz enhanced photoacoustic spectroscopy
    QEPAS
    volatile organic compound
    VOC
    ethanol
    Opis:
    Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for volatile organic compounds (VOCs) measurements. Primary laboratory test on ethanol spectroscopy was investigated and compared with traditional direct absorption spectroscopy (DAS). Experimental results show that the proposed QEPAS is more sensitive than the conventional DAS method. In addition, the significant linear dependence of photoacoustic signal on sample pressures and laser operating parameters was observed.
    Źródło:
    Optica Applicata; 2018, 48, 4; 687-695
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deflectometry for phase retrieval using a composite fringe
    Autorzy:
    Liu, T.
    Zhou, C.
    Liu, Y
    Si, S
    Lei, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/173892.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wavefront measurement
    fringe analysis
    phase retrieval
    fast Fourier transform (FFT)
    multifrequency heterodyne principle
    Opis:
    An improved deflectometry for wavefront measurement using a composite fringe is proposed to reduce the projection fringes and improve the accuracy. The single composite fringe contains four fringes in different directions. It goes through the tested objects and then is captured by a CCD camera. Two high frequency orthogonal fringe patterns and two single period orthogonal fringe patterns can be obtained from the composite fringe by fast Fourier transform. The unwrapping of the wrapped phase of the high frequency fringe is accomplished by the corresponding single period fringe using a heterodyne method. The wavefront is reconstructed by the integration of partial derivatives. Using only one fringe, the proposed method is more applicable to dynamic wavefront measurement. The experimental results demonstrate that the proposed method can retrieve the complex wavefronts more accurately.
    Źródło:
    Optica Applicata; 2014, 44, 3; 451-461
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation kinetics and thermodynamic behavior of chalcopyrite and pyrite in high alkaline systems
    Autorzy:
    Yan, H.
    Yuan, Q.
    Zhou, L.
    Qiu, T.
    Ai, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/110078.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetics
    pyrite
    chalcopyrite
    flotation separation
    high alkaline
    microcalorimetry
    Opis:
    The monomineral flotation test and microcalorimetry were used to study the flotation kinetics and thermodynamic behavior of chalcopyrite and pyrite in high alkaline systems of lime and NaOH. The results showed that in these systems there were less hydrophilic substances on the chalcopyrite surface, so that the apparent activation energy of sodium butyl xanthate (SBX) adsorption on chalcopyrite surface was low. This promoted the adsorption of SBX and increased the flotation rate and recovery of chalcopyrite. In contrast, the hydrophilic Fe(OH)3 and SO42- formed by oxidation on the pyrite surface increased the adsorption activation energy of SBX. Thus, the flotation rate and recovery of pyrite were lower. Moreover, in the lime high alkaline system, the hydrophilic calcium film generated on the pyrite surface further hindered the adsorption of SBX, thereby further inhibiting pyrite in this environment. In other words, the lime high alkaline environment increased the apparent activation energy difference of SBX adsorption between chalcopyrite and pyrite compared to the NaOH system, facilitating the flotation separation of chalcopyrite and pyrite. The results can help with the theoretical research of flotation separation of other minerals, and provide guidance for developing low alkaline and lime-free pyrite depressants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 901-910
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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