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    Wyświetlanie 1-4 z 4
    Tytuł:
    Polarization dependence of patterning effects in quantum well semiconductor optical amplifier-based wavelength conversion
    Autorzy:
    Qin, C
    Shen, W
    Zhao, J.
    Yu, H.
    Xu, E
    Powiązania:
    https://bibliotekanauki.pl/articles/173469.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    semiconductor optical amplifiers
    polarization
    patterning effect
    Opis:
    In this paper, polarization dependence of patterning effects in quantum well semiconductor optical amplifier-based wavelength conversion is experimentally and theoretically investigated. The carrier and photon density rate equations are numerically solved by using the time-domain traveling wave model. The material gain calculation, including the strain effect in the active layer, is based on the k·p method. By comparing experimental and computational results, it is demonstrated that the polarization of the injection signal has a significant influence on the gain recovery time of quantum well semiconductor optical amplifier. Under the cross-polarized signals injection, the output signals suffer the weakest and strongest patterning effects both for unstrained and tensile strained quantum well semiconductor optical amplifiers.
    Źródło:
    Optica Applicata; 2015, 45, 2; 163-172
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitive detection of acetylene by second derivative spectra with tunable diode laser absorption spectroscopy
    Autorzy:
    Deng, H.
    Sun, J.
    Li, P.
    Liu, Y.
    Yu, B.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174963.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tunable diode laser absorption spectroscopy
    TDLAS
    signal processing
    Savitzky–Golay filter
    trace gas detection
    Opis:
    A tunable diode laser absorption spectrometer was developed for trace acetylene gas analysis, the system performance was evaluated by combing an appropriate digital signal processing methods, i.e., Savitzky–Golay smoothing and differentiation algorithm. The calculation of the derivative spectra by this method is accompanied by simultaneous data smoothing. Based on the 2nd deriv- ative spectra detection method, the Allan variance technique indicates a C2H2 detection limit of 1.7ppm for 1-s averaging time, and a minimum noise level of 62ppb (parts per billion), at the optimum integration time of ~60s. The calculated 2nd derivative spectra with better resolution, lower detection limits, save signal processing time, and improve the ability to distinguish unresolved spectral signals.
    Źródło:
    Optica Applicata; 2016, 46, 3; 353-363
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of float-sink and progressive release flotation of ground products of coal middlings
    Autorzy:
    Xie, W.
    He, Y.
    Luo, C.
    Zhang, X.
    Li, H.
    Yu, J.
    Wang, H.
    Shi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/109500.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coal middlings
    float-sink
    progressive release flotation
    XPS
    EDX
    Opis:
    An additional recovery of coking coal middlings can be utilized for increasing of the concentrate yield of coking coal. A combined flow sheet of comminution and flotation can realize this target. To investigate the effect of grinding process on further flotation of ground products, progressive release flotation tests were used to compare with the float-sink tests, which were regarded as a criterion. Coal middlings were ground by wet-milling with iron balls to <0.5 mm. Curves of ash vs. cumulative yields of sized products indicated that the concentrate yield of coal separated by progressive release flotation was lower than that of coal benefited by the float-sink test, with the same ash for four size fractions (0.5-0.25 mm, 0.25-0.125 mm, 0.125-0.074 mm and <0.074 mm). Distributions of elements conducted by energy disperse spectroscopy (EDX) showed that associated kaolinite was liberated and exposed on the surface. It led to the shift of local surface property from hydrophobicity to hydrophilicity. Meanwhile, analyses of chemical property performed by an X-Ray photoelectron spectrometer (XPS) depicted that the hydrophilic mineral FeOOH, which generated in the grinding process, was adsorbed on the coal surface. Flotation of the ground products were worsened due to the increase of hydrophilicity of the coal surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 675-684
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic research of quinoline, pyridine and phenol adsorption on modified coking coal
    Autorzy:
    Sun, X.
    Xu, H.
    Wang, J.
    Ning, K.
    Huang, G.
    Yu, Y.
    Ma, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110365.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption kinetics
    modification
    coking coal
    coking wastewater
    Opis:
    Adsorption is widely used in wastewater treatment. In this work, the removal of quinoline, pyridine and phenol from coking wastewater by using modified coking coal, which was treated by four different modification methods i.e. acidification sodium hydroxide (5 mol/dm3), hydrochloric acid (5 mol/dm3) and acetic acid (5 mol/dm3) and low-temperature (105 oC) oxidation, was investigated. The modified coal was characterized by the surface area analysis, SEM, total acidity and basicity and FT-IR. The results showed that the surface area from high to low follows the order: modification with acetic acid, modification with hydrochloric acid, raw coal, modification with sodium hydroxide and modification with low-temperature. Experimental data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion. The adsorption of all followed pseudo-second-order kinetics. The result showed that the removal efficiency of coal modified by hydrochloric acid and acetic acid are higher than raw coal, while modified by sodium hydroxide and low-temperature are lower than raw coal., The coal modified by hydroxide acid had the best adsorption capacity.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 965-974
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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