Biomedical subjects

Jun-de Wang

Publications and source records attributed to Jun-de Wang.

21 records · Page 2Linked to original sources

PubMed2002

[Spectroscopic determination of the dynamic electrical spark temperature of nonel tube igniter].

A set of transient real time two-line spectroscopy temperature measured system with quartz optical fiber was established. Two spectral lines are Cu I 510.5 and Cu I 521.8 nm respectively. Its maximum time resolution is up to 0.1 microsecond. The discharge spark temperature and spark discharge time of the nonel tube igniter under different voltage are 2,100-4,200 and 100-200 microseconds respectively. The spark discharge time increase with the rising of charge voltage. The discharge spark temperature variations versus the discharge time under different voltages, and the spark duration under different discharge conditions were studied with this instrument.

English Abstract↗

PubMed2002

[Comparison of four multivariate calibration methods in simultaneous determination of air toxic organic compounds with FTIR spectroscopy].

The concentration determination abilities of four multivariate calibration methods--classical least squares (CLS), partial least squares (PLS), kalman filter method (KFM) and artificial neural network (ANN) were compared in this paper. Five air toxic organic compounds--1,3-butadiene, benzene, o-xylen, chlorobenzene, and acrolein--whose FTIR spectra seriously overlap each other were selected to compose the analytical objects. The evaluation criterion was according to the mean prediction error (MPE) and mean relative error (MRE). Results showed that PLS was superior to other methods when treating multicomponent analysis problem, while there was no comparable difference between CLS, KFM and ANN.

Acrolein↗

PubMed2002

[Combustion temperature measurement of pyrotechnic composition using remote sensing Fourier transform infrared spectrometry].

In this paper, combustion characterization of pyrotechnic composition is investigated using a remote sensing Fourier transform infrared spectrometry. The emission spectra have been recorded between 4,700 and 740 cm-1 with a spectral resolution of 4 cm-1. The combustion temperature can be determined remotely from spectral line intensity distribution of the fine structure of the emission fundamental band of gaseous products such as HF. The relationship between combustion temperature and combustion time has been given. Results show that there is a violent mutative temperature field with bigger temperature gradient near combustion surface. It reveals that the method of temperature measurement using remote sensing FTIR for flame temperature of unstable, violent and short time combustion on real time is a rapid, accurate and sensitive technique without interference the flame temperature field. Potential prospects of temperature measurement, gas product concentration measurement and combustion mechanism are also revealed.

Fluorocarbons↗