Relevance list of the problem

First, all physical parameters necessary to describe the problem are listed. This so-called relevance list of the problem consists of the quantity in question and of all the parameters that influence it. In each case, only one target quantity must be considered it is the only dependent variable. On the other hand, all the influencing parameters must be primarily independent of each other. 

This reasoning leads to the following relevance list of the problem ... 

Relevance lists of some problems contain a whole host of parameters. This makes the elaboration of the process characteristic a difficult endeavor. In some cases a closer look at a problem (or previous experience) facilitates a reduction of the num-... 

The character tables for the point groups which are relevant to most of the problems and discussions in this book are listed here. The transformation properties of the s, p and d orbitals are indicated by their usual algebraic descriptions appearing in the appropriate row of each table. 

The outputs of Step 1 illustrated for the case studies in a box on the next page include a list of the planning team members and their roles identification of decision makers a concise description and a conceptual model of the environmental problem in question and a summary of available resources and relevant deadlines for the project, such as the budget, personnel, and schedule. 

Important Tips Concerning the Compilation of the Problem Relevance List... 

In fact, this actually means that the pi-set could be reduced if one succeeds to enlarge the base dimensions of the dimensional system. However, it must be considered that in the enlargement (reduction) of a dimensional system the relevance list must also be enlarged (reduced) by the corresponding dimensional constant by which the number of the resulting pi-numbers is not changed. However, it can turn out that in the enlargement of the dimensional system the additional dimensional constant is, a priori, irrelevant to the problem. In this case, it need not be incorporated into the relevance list and the number of pi-numbers is, in fact, reduced by one. 

For a given geometry of the set-up, the relevance list for this problem contains the power consumption, P, as the target quantity, the stirrer diameter, d, as the characteristic length and a number of physical properties of the liquid and the gas (the latter are marked with an apostrophe) Densities, p and p, kinematic viscosities, v and v, surface tension, a, and an unknown number of still unknown physical properties, S, which describe the coalescence behaviour of finely dispersed gas bubbles and by this, indirectly, their hold-up in the liquid. The process parameters are the stirrer speed, n, and the gas throughput, q, which can be adjusted independently, as... 

It is absolutely essential that the searcher imderstand the nature of the problem. He asks himself what the elements of the request are. Is it a question of a single-step process or a simple compoimd, or are there many steps with varying degrees of dependence If so, what are they If it is a new product, is it a new species or is it generic in nature How broadly must the search be made to cover all relevant material What analogous procedures or equivalent products must be considered It is usually helpful, unless the request is very simple, to reduce the analysis to a written outline accompanied by a brief list of the sources to be examined before the actual search is begun. 

We have looked at many ion reactions in this chapter, and we shall now look at how simple test-tube experiments maybe used to identify common ions. A list of the ions which are relevant to the problems below is given in Table 6.3. 

For the normal MEDLARS service, the scientist in need of information discusses his problem with a trained librarian-information officer. Between them, they draw up a list of the subject headings and develop logical statements which define what combinations of these terms are relevant. 

An elementary introduction to chemistry is given in Chapter 3 this serves only to provide background and for more advanced consideration reference will be necessary to specific text books, e.g. as listed in the Bibliography. A brief discussion of the relevance of physicochemical principles to hazard identification is given in Chapter 4. Relevant toxic and flammable properties, and summaries of appropriate precautions to cater for them during handling, use and disposal, are provided in Chapters 5 and 6, respectively. Reactive hazards are discussed in Chapter 7. The special problems with cryogenic materials and chemicals under pressure, typified by compressed... 

---