Cut strategy

In such a situation, the only clear cut strategy that leads to a definite answer concerning the valence state of the iron is not only to apply spectroscopic methods complementary to Mossbauer spectroscopy but also to investigate complexes with similar ligands but different electronic configurations. In order to clarify the electronic configuration of [(Me3cy-ac)FeN](PF6)2, X-ray absorption spectroscopy (XAS) has... 

Within batch chromatography there exist many approaches for optimization. Basically, though, they can be classified into two approaches, which differ in their fractionation mode or cut strategy (Fig. 7.6). 

In cut strategy II the products are collected consecutively. Or more precisely, the next fraction collection starts immediately after the previous fraction. High purity... 

Cut strategy I allows a waste fraction between the product fractions, which can be either discarded or processed further (e.g. by recycling the waste fraction or by application of other separation steps, such as crystallization, to purify it). Due to the introduction of a waste fraction the optimization problem gains additional degrees of freedom, i.e. times for the beginning and the end of waste collection. These additional degrees of freedom, however, will not increase the complexity of the optimization, because they are pinpointed automatically by the purity demand, which serves as a boundary condition for the optimization problem. 

Since cut strategy II is only the marginal case of cut strategy I and since the application of cut strategy I provides more flexibility and often leads to a better global optimum, only cut strategy I will be used for model-based optimization in this chapter. 

Applied cut strategy waste fraction is allowed (cut strategy I, Fig. 7.6)... 

In contrast to the work quoted so far, Strube and Diinnebier applied a different approach by optimizing elution chromatography using cut strategy II. Strube uses a transport-dispersive model for his simulation studies and optimized the productivity... 

Source Cut strategy Applied model Suitable for isotherm type Objective function Boundary conditions Degrees of freedom... 

Figure 10.1. Grading of hardwoods cutting strategies for boards that vary greatly in quality (NHLA, 1991). In this example the 12 foot x 12 inch board has a surface area of 144 units.

Support users in deciding upon a cutting strategy at the front-end stages of the programming process... 

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