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Robustness margins are respectively shown in table (1), the goal here is to approach the margins form known robustness margins. A slow change in parameter values and further regulation and traking may increase the system robustness in closed loop (Oustaloup, 1994). 01 Table 1. Robustness margins in function of tracking and control parameters. The robustness test is important to identify the operating factors which are not necessarily considered in the development phase of the method, but could influence the results, and therefore to anticipate problems that may occur during the application of the chosen method.

2010) classifies the reaction kinetic models in microkinetic approach and the empirical method. Basically, the micro kinetic approach explores the detailed chemistry of the reaction. On the other hand, the empirical models are based on the experimental results and are typically expressed in the Arrhenius model and provide an easy and computationally lighter way to predict the rate of reaction. The main disadvantage is the fact that the adjusted model cannot be extrapolated to different composition and types of catalysts.

Assen Zlatarov”- Burgas, Bulgaria 1. Introduction The aim of the present chapter is to study the possibility to use PSA synthesized by the authors for production of commercial transmission and motor oil. The practically used compounds are usually surfactants, which must be soluble in a medium of non-polar petroleum hydrocarbons. This required the optimal length of the hydrocarbon radical of the main hydrocarbon chain guarantees property. The polar group of the additive, which determines its main function, has certain electron effect.