Biomedical subjects

Qing-nong Wei

Publications and source records attributed to Qing-nong Wei.

4 recordsLinked to original sources

PubMed2006

[Passive FTIR remote sensing of gaseous pollutant in heated plume].

The principle and techniques of passive remote sensing of gaseous pollutant in heated plume was illustrated and discussed in this paper. The algorithm of radiance spectra and transmittance spectra in measured region was proposed, and the method of retrieving gas concentrations with NLLS fitting algorithm was also proposed. The remote senseing of actual gaseous pollutant of smokestack was done, and the quantitative analysis of SO2 and CO2 was completed.

English Abstract↗

PubMed2006

[The fluorescence emission of water at upconversion of frequency by laser induced fluorescence].

The fluorescence spectra of several types of water samples in combination with laser-induced fluorescence (LIF) measurements using 532 nm wavelength excitation source were measured in the laboratory, and the fluorescence matters such as dissolved organic matter (DOM), chlorophyll a (Chl a) and carotenoids were pointed out with spectral fluorescent signature (SFS) technique. It is considered that the peak at 455 nm in the spectrum is contributed by carotenoid (PPC). Finally, the dynamic model of PPC's fluorescence emission is showed.

English Abstract↗

PubMed2006

[The influence of temperature change on determined concentrations of dissolved organic matter in water].

The influence of temperature change on the determined concentrations of dissolved organic matter (DOM) in water was investigated by laser induced fluorescence (LIF) technique in laboratory. The temperature was altered within the range of 20 to 75 degrees C, and the intensity of DOM fluorescence and water Raman scattering were found to decrease with rising temperature. A linear fit of the normalized fluorescence intensity versus temperature yielded a mean value of the temperature coefficient of -5.24 x 10(-4) x degrees C(-1), and a mean value of the temperature coefficient of -3.42 x 10(-3)(mg x L(-1)) x degrees C(-1) was obtained according to the relationship between normalized fluorescence intensity and concentration of DOM. The temperature change will cause relative changes of up to 8.45% in DOM concentration within the range of 20 to 75 degrees C if we assume that the normalized fluorescence intensity remains the same.

English Abstract↗

PubMed2005

[Study on UV-visible DOAS system based on photodiode array (PDA)].

A long-path differential optical absorption spectroscopy (DOAS) system is introduced. A photodiode array is employed as the detector to replace the complicated SD detector which consists of a PMT and a slotted disk. The properties of the detector and the spectrometer unit such as offset, dark current, noise, linearity, resolution, and wavelength range were measured. This system was also tested to measure SO2 and NO2 in the atmosphere. The detection limits of this system for SO2, and NO2 over a 713 m light path were determined.

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