Comparison of models

Zhu L, Chen W, Hase W L and Kaiser E W 1993 Comparison of models for treating angular momentum in RRKM calculations with vibrator transition states. Pressure and temperature dependence of CI+C2H2 association J. Phys. Chem. 97 311-22... 

Comparison of Models Only scattered and inconclusive results have been obtained by calculation of the relative performances of the different models as converiers. Both the RTD and the dispersion coefficient require tracer tests for their accurate determination, so neither method can be said to be easier to apply The exception is when one of the cited correlations of Peclet numbers in terms of other groups can be used, although they are rough. The tanks-in-series model, however, provides a mechanism that is readily visualized and is therefore popular. 

R. Cheeseman, G. W. Trucks, T. A. Keith and M. J. Frisch, A Comparison of Models for Calculating Nuclear Magnetic Resonance Shielding Tensors, /. Chem. Phys., 104, 5497(1996). 

Felix, Q. A., Ehret, R, and Summers, J. L., On Three- [66] Dimensional Flat-Top Defects Passing Through an EFIL Point Contact A Comparison of Modeling with Experiments, ... 

Perhaps a more severe comparison of model response is the time history of the centerline temperature. These values reflect the interaction of several phenomena the reaction itself, the heat liberated by the reaction, the heat storage capacity of the material, and the rate at which heat can be carried away from the centerline region by conduction. Figure 8 shows the temperatures predicted by the Chiao and finite element models, as well as the imposed autoclave temperature history. It also includes five thermocouple readings which were reported in Chiao s manuscript (8). 

Fio. 13, Comparison of model predictions (solid line) with training data (dashed line) for identification example. 

Comparison of model results with numerical data independently derived from experiment or observation of the environment. 

Figure 5.90 Comparison of model and critical heat flux data. (From Levy et al., 1980. Copyright ...

Figure 27. Comparison of model of Wirth with experimental data. (From Wirth, 1995.)...

DDE The comparison of model data with observations shows significant discrepancies for the spatial distribution in atmosphere and ocean. The observed concentrations show a decrease from low to high latitudes, whereas the model results show an increase of oceanic concentrations. Therefore, modeled concentrations in the Arctic atmosphere strongly exceed observations. In general, possible could be in-... 

The comparison of model results with observations reveals significant discrepancies, especially in the Arctic, where concentrations are overestimated by the model in ocean and atmosphere. The model does not reproduce the observed latitudinal gradient of DDT in the ocean, i.e. the modelled and observed gradients have a different sign. Observations show, that the contamination of the ocean by DDT is decreasing towards the Arctic, whereas in the model simulation contaminations are increasing. 

In studies comparing measured and modelled HOx radical concentrations, the models usually overestimate [OH] by 20-50%. A detailed review of the comparisons of modelled and measured concentrations of OH and H02 can be found in Heard and Pilling (2003). In particular, several studies have been made in the marine boundary layer. 

Chen, G., Davis, D., Crawford, J., Heikes, B., O Sullivan, D., Lee, M., Eisele, F., Mauldin, L., Tanner, D., Collins, J., Barrick, J., Anderson, B., Blake, D., Bradshaw, J., Sandholm, S., Carroll, M., Albercook, G., and Clarke, A. An assessment of HOx chemistry in the tropical Pacific boundary layer Comparison of model simulations with observations recorded during PEM tropics A, J. Atmos. Chem., 38,317-344,2001. 

Reddy MC, McCarley K, Bunge AL (1998) Physiologically relevant one-compartment pharmacokinetic models for skin. 2. Comparison of models when combined with a systemic pharmacokinetic model. J Pharm Sci 87 482-490. 

TABLE 5-4 Statistical Comparison of Model Calculations and Observations of Carbon Monoxide Concentration"... 

A Comparison of Models and Model Parameters for the Interpretation of Carbon-13 Relaxation in Common Polymers... 

---