Separation Principles Technique resources

This technique comes in handy when the innovation opportunity is (a) well-defined and (b) contains at least one technical contradiction (see Structured Abstraction, Technique 23) or physical contradiction (see Separation Principles, Technique 24). Unless you re well-versed in the Theory of Inventive Problem Solving (TRIZ), you will need special assistance from an expert to properly apply this technique. Several U.S. and U.K. organizations can help (see resource list at the end of this technique). 

Direct analysis of lipid classes enables faster and more efficient usage of analytical resources and sample material. Many of the direct analysis techniques are derived from the basic principles of chromatography described above. However, they have evolved specific instrumentation to enable (in most cases) improved separation... 

Instrumental techniques for measurement of particle size distribution of powders have had a tremendous advancement in recent times. Numerous methods and procedures have been developed at a steady pace over the years, and there is the possibility of covering the wide spectrum from nanosystems, to ultrafine powders, and to coarse particulate assemblies. Many instruments offer nowadays quick, reliable results for a wide variety of powders and particulate systems, and for a number of applications. There is still, however, the need to understand the basic principles under which sophisticated instruments operate, as well as to resource to direct measurements under some circumstances. Some of the most modern instrumental techniques are based on an indirect measurement and carry out transformations among the different ways of expressing particles size distributions, that is, by number, surface, or mass. Sometimes it is advisable to avoid transformations because instruments assume a constant shape coefficient on such transformation, which is not necessarily the case, and overestimation or underestimations of size of certain particles may arise. Also, in very specific applications, or in cases of basic or applied research, is better to measure directly the most relevant particle size and particle size distribution. For example, if research is carried out in modeling of solid-liquid separations, a direct measurement of the Stokes equivalent diameter would be most appropriate. The aim of the exercise is to measure the particle size distribution of a sample of medium-sized dolomite, and compare the results with those of the Andreasen Pipette method. 

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