It becomes a key technology to measure the concentration of the vehicle exhaust components with the absorption spectra. But because of the overlap of gas absorption bands, how to separate the absorption information of...It becomes a key technology to measure the concentration of the vehicle exhaust components with the absorption spectra. But because of the overlap of gas absorption bands, how to separate the absorption information of each component gas from the mixed absorption spectra has become the key point to restrict the precision of the optical detection method. In this paper, the ex-perimental platform for the absorption spectrum of vehicle exhaust components has been established. Based on the ultraviolet absorption spectra measured with the platform of exhaust gas NO & NO2, the concentration regression model for the two components has been established with weighted partial least squares regression (WPLS). Finally the each spectral characteristic information of NO & NO2 gas has been separated and the concentration of each corresponding component has been reversed successfully.展开更多
Well-aligned ZnO nanorod arrays were prepared on FTO substrate by hydrothermal method at low temperature for 5 h.The effect of ammonia on the length of ZnO nanorod was studied in detail.The resulting materials were ex...Well-aligned ZnO nanorod arrays were prepared on FTO substrate by hydrothermal method at low temperature for 5 h.The effect of ammonia on the length of ZnO nanorod was studied in detail.The resulting materials were extensively characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and UV-visible absorption spectra(scatter mode).With the increase of ammonia,the length of ZnO nanorod increases.展开更多
文摘It becomes a key technology to measure the concentration of the vehicle exhaust components with the absorption spectra. But because of the overlap of gas absorption bands, how to separate the absorption information of each component gas from the mixed absorption spectra has become the key point to restrict the precision of the optical detection method. In this paper, the ex-perimental platform for the absorption spectrum of vehicle exhaust components has been established. Based on the ultraviolet absorption spectra measured with the platform of exhaust gas NO & NO2, the concentration regression model for the two components has been established with weighted partial least squares regression (WPLS). Finally the each spectral characteristic information of NO & NO2 gas has been separated and the concentration of each corresponding component has been reversed successfully.
基金supported by the Doctoral Project by Liaoning Province(No.20101061)the Natural Science Foundation of Dalian City(No.2010J21DW020).
文摘Well-aligned ZnO nanorod arrays were prepared on FTO substrate by hydrothermal method at low temperature for 5 h.The effect of ammonia on the length of ZnO nanorod was studied in detail.The resulting materials were extensively characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and UV-visible absorption spectra(scatter mode).With the increase of ammonia,the length of ZnO nanorod increases.
