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Digitale Medien

A new method for optimizing the structure of thermodynamic correlation equations (1989)

Setzmann, U. ; Wagner, W.

Springer

International journal of thermophysics 10 (1989), S. 1103-1126

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Details

ISSN: 1572-9567

Schlagwort(e): correlation equation ; equation of state ; least-squares principle ; optimization method ; search method

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract An optimization strategy is presented for optimizing the structure of empirical thermodynamic correlation equations. Based on a comprehensive functional expression for the physical dependence considered, which is called a “bank of terms,” the new procedure optimizes the structure and the length of the equation as well. The application of this method results in an equation which meets the quality wanted for representing the experimental data with the lowest number of fitted coefficients. The procedure can be used for the determination of the structure of any equation where the method of the linear least squares is applicable. A detailed description of the algorithm is given which includes values for the control parameters for different applications in the field of thermodynamics (vapor pressure equations, equations of state, etc.) and also for applications in other fields. The optimization steps are described using an equation which represents a relationship between variables in a general form. It is demonstrated how even the complex problem of the optimization of a fundamental equation for the Heimholtz energy can be written in terms of this general equation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00500566

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Digitale Medien

Raman excitation profiles from pigments in vivo (1986)

Wagner, W.-D.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 17 (1986), S. 51-53

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Details

ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Raman excitation profiles (REPs) for bands of carotenoid and chlorophyll b (Chl b) from whole cells of green algae at low temperatures are presented. In addition to preventing thermal destruction of the samples during long-term irradiation, the use of a double channel surface scanning technique allowed the recording of the Raman spectrum of a non-resonating substance such as acetone suitable as an intensity reference at the same time. The measured REPs are compared with the absorption spectrum of whole cells at low temperatures.

Zusätzliches Material: 4 Ill.