Generalized numerical method is developed for computing the band model parameters (the average absorption coefficient and the average spectral line density) for asymmetric top molecules.
On the basis of the newest high resolution high temperature gas spectral data base HITEMP and by way of a rational extrapolation obtained were the water vapor spectral band model parameters in the 300 3000 K temperature range. The latter include an average absorption factor, spectral line density, spectral line half width.
Generalized numerical method is developed for computing the band model parameters (the average absorption coefficient and the average spectral line density) for asymmetric top molecules.
Spectrum analyse was made and the average attenuation coefficient from the source to received point was calculated separately using the intensity attenuation method and the centroid frequency downshift method to the two models which abnormal body is square.
The range of measurement was in the(2.5-20μm) wave number. The results showed that themean-absorbed coefficient was 200, the mean-transmissivity was34.90%.
Yong method and our previous research work, The band model parameters for dioxide carbon 8.8~20μm wavelength range have been calculated systematically.
As preparation, solution algorithms of Finite Volume Method (FVM), which is chosen as the solver of Radiative Transfer Equation (RTE), in structure/unstructured grids are presented and models for absorption coefficient, especially, Plank mean absorption and correlated- k distribution (CK) model, are introduced.
The values of these quantities are given in tables as functions of the surface temperature To of the envelope and the parameter δ/α, where δ is the coefficient of electron scattering and α is the mean absorption coefficient.
The ablation threshold of solutions with heterogeneous absorption was found to be much lower (3 to 4 times) than the ablation threshold of solutions with homogeneous absorption and with the same average absorption coefficient.
Rather than computing estimates directly from time series, the system is modelled as a finite state Markov chain to extract stationary behaviour in the form of invariant measures and average absorption times.
The retention (2.8%) and absorption (7.8%) of 28-Mg were markedly reduced in comparison to controls (average retention 25% and average absorption 28%).
The ablation threshold of solutions with heterogeneous absorption was found to be much lower (3 to 4 times) than the ablation threshold of solutions with homogeneous absorption and with the same average absorption coefficient.
Each pixel represents a CT number that is related to the average absorption coefficient of a spatial volume within the scanned field.
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The infrared transmission spectrum and absorbed coefficient of fourwoods of Pinus koraiensis, Pinus armandii, Larix sp. and Pseudotsugamenziesii were studied. The range of measurement was in the(2.5-20μm) wave number. The results showed that themean-absorbed coefficient was 200, the mean-transmissivity was34.90%.
The integrated band intensity formula of carbon dioxide is corrected in present work. Generalized equations are developed for computing the band model parameters(S/d) and(l/d) on the average integrated line strength and line spacing expressions for 4.3μm band of carbon dioxide. The band model parameters are obtained for 4.3μm band of CO2 from 300K to 3000K. It is shown that the contribution of isotope 18CO2 for (S/d) is not ignored at low temperature and sufficient numbers of hot bands must be considered at...
Generalized numerical method is developed for computing the band model parameters (the average absorption coefficient and the average spectral line density) for asymmetric top molecules. Using the method, 6.3μ H2O band model parameters are calculated, which show that the method is effective.
平均吸收系数
average absorption
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