Festschrift für den 3. Internationalen Petroleumkongreß (Bukarest, September 1907)

Die Entwicklung der deutschen Portland-Zement-Industrie ...

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Monograph

Identifikator:: 890184704

URN:: urn:nbn:de:zbw-retromon-6609

Document type:: Monograph

Title:: Festschrift für den 3. Internationalen Petroleumkongreß (Bukarest, September 1907)

Place of publication:: Berlin

Publisher:: Verlag für Fachliteratur G.m.b.H

Year of publication:: 1907

Scope:: 1 Online-Ressource (125 Seiten)

Digitisation:: 2017

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Der Crackingprozeß bei der Verarbeitung rumänischen Erdöls

Collection:: Economics Books

SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE ETC. 203 and the amount of usable irrigation water are the same. That is one extreme. The other extreme occurs when the natural inflow happens to coincide with the period of irrigation de- mand; then the reservoir may do no good at all, the water would be available when needed even without it. In that case the yield is zero. Of course, zero-yield reservoirs are never built; they are simply a conceptual possibility. Many genuine cases lie between these two extremes, and there are patterns of inflow and demand in which the yield is greater than the capacity. All this is complicated enough, but the case here described — of an isolated reservoir operated for irrigation supply only — is excessively simple. These considerations make it clear that the relationship between height of dam (which costs resources) and usable output is by no means an easv one to ascertain. Current practice avoids determining this functional relation- ship. Instead it determines one or two points on it by postul- ating a specific height for the dam and then estimating the usable yield provided by that height by means of quite elaborate calculations. The instance of the dam height-usable output relation- ship is cited to illustrate the complexities hidden in every one of the performance functions required for the analysis of an investment project. There seem to be two ways to proceed and it appears that in practical analysis both should be followed. One is to impose drastically simplified functional relation- ships. For example, the relationship between dam height and average reservoir content might be approximated by a qua- dratic function, and the other relationships would similarly be held to the simplest expressions that state the problem in a meaningful way. This procedure would both facilitate empirical estimation of the parameters required and would simplify the formal problem of finding the optimal values of the design specifications. It would also, of course, be extremely un reliable. Dorfman - pag. 17

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