Advanced air pollution by Farhad Nejadkoorki

By Farhad Nejadkoorki

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The results showed concentration peaks during cooking, but with large differences resulting from different rates of gas burning. The principal method used for measuring NO2 is based on chemiluminescence (6), (7): NO + O3 → NO2* + O2 (6) NO2* → NO2 + hυ (7) where hυ represents a photon of solar radiation of energy and NO2* is the NO2 molecule in the excited state. NO2 concentrations are determined indirectly from the difference between the NO and NOx (NO + NO2) concentrations in the atmosphere. These concentrations are determined by measuring the light emitted from the chemiluminescent reaction of NO with O3 (similar to the reaction of O3 with ethylene noted for the measurement of O3), except that O3 is supplied at a high constant concentration, and the light output is proportional to the concentration of NO present in the ambient air stream (Vallero, 2008).

The type of model used depends on the planned uses of the model. , 2001). Designing a model and modelling can substantially contribute to problem solving and to obtaining new understanding of system behaviour with respect to air component dynamic changes. A mathematical description of the processes can generalise experimental results so that they may be used to interpret other processes physically similar to those introduced in the model. Although modelling doesn’t achieve all the rules of similarity, it does provide overall information about a system’s behaviour, which is only a little different from a real situation.

This value, called the dependency degree of the involved variable in relation to the mentioned feature, will be evaluated. Zero desirability degree means that the involved variable isn't provided at all for the related variable or the involved variable is not desirable for the correspondent feature at all; and desirability degree one implies that the target feature is completely provided for the involved variable or the involved variable is absolutely desirable for the related feature. A desirability degree of between zero and one means that the involved feature is partially provided for the target variable or the involved variable is partially desirable for the related feature.

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