Cascades heavy fraction

The flow rate ratio Kin/Kin) called the internal reflux ratio, as opposed to external reflux ratio of definition (8.1.137) since no formal reflux stream is generated in Figure 9.1.1(b). This flow rate ratio provides an estimate of the heavy fraction flow rate downward in the cascade below stage n in the enriching section. We are interested in its variation with the stage number n. 

Obtain an expression for the total heavy fraction flow rate (downffow) in the enriching section of the cascade, i.e. develop a continuous version of Problem 9.1.1 for an illustration of the... 

The great advantage of the described condensation resin with [2b.2.2] anchor groups lies in the very favourable isotopic separation dependent on the eluted amount of substance (see Fig. 16) and by the fact that a pure solvent can be used as eluant which simplifies the isolation of the isotopic-enriched fractions. Now, additional experiments with larger columns and the application of the cascade principle (Chap. 2.5.2) will have to prove whether or not an enrichment of the heavy isotopes on a technical scale is possible with this exchange system. 

X-ray analysis using different excitation and detection teclmiqiies has wide apphcations hi fields ranging from biology and medicine to archaeology and forensic science. One interesting area of application is the measurement of heavy metals in particulate air pollution [5.15]. Airborne particles can be collected hi different size fractions using special devices called cascade im-... 

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