Postponement approach

The end of field life is often determined by the lowest reservoir pressure which can still overcome all the pressure drops described and provide production to the stock tank. As the reservoir pressure approaches this level, the abandonment conditions may be postponed by reducing some of the pressure drops, either by changing the choke and separator pressure drops as mentioned, or by introducing some form of artificial lift mechanism, as discussed in Section 9.7. 

In order to protect the environment, the precautionary approach shall be widely applied by the States according to their capabilities. Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. ... 

This illustrates the general philosophy of taxometrics. For something to be deemed a taxon, it needs to clear several hurdles, which arguably makes taxometrics the most rigorous analytic approach to the study of taxonomy. The last two conditions (e and f) are external consistency tests and apply to all taxometric studies. On the other hand, a, b, c, and d are internal consistency tests. Some of them are specific to MAXCOV—other procedures have their own unique internal consistency tests—but a and b can be performed with any of the CCK methods. We will now consider the first three internal consistency tests (a, b, and c) in detail and postpone discussion of the distribution of taxon membership. 

Historically, the first of the modem descendents of the Coulson-Fisher method proposed was the GGVB approach. Nevertheless, we will postpone its description, since it is a restricted version of still later proposals. 

The present chapter, however, is concerned with the traditional approach. We shall carefully stay within the limits of validity, although these limits will only become clear in chapter X. The reader is advised that any doubts he may have must be postponed. 

The copolymer approach is interesting, but it does not lead to a direct answer concerning the intra- and inter molecular contributions to the cooperative nature of the /3 transition motions of BPA-PC. This discussion is postponed until later on in this section, after considering the information provided by the whole set of experimental and atomistic modelling investigations. 

This assessment and definition stage is often either rushed, overlooked or postponed by eager students, such an approach usually leads to wasted time and effort later in the design. Make it a rule to know what you have and where you are going, rather than simply thinking that you know. 

The problem of dimensionality in Eq. (3.4.4) can obviously be disposed of quite readily in the present approach. The specification of the standard chemical potential requires more ingenuity a consideration of this problem is postponed to later sections. 

A possible spontaneous haemostasis, which is found without active therapy in about half the cases of upper gastrointestinal bleeding, should on no account encourage the assumption of a passive approach with the postponement of suitable therapeutic procedures. There is an enormous danger of massive renewed haemorrhage as well as of the development of complications within a few hours following spontaneous haemostasis, (s. fig. 19.12)... 

In conventional chemical kinetics, time changes of concentrations are described deterministically by differential equations. Strictly, this approach applies to infinite populations only. It is justified, nevertheless, for most chemical systems of finite population size since uncertainties are limited according to some /N law, where N is the number of molecules involved. In a typical experiment in chemical kinetics N is in the range of 10 or larger, and hence fluctuations are hardly detectable. Moreover, ordinary chemical reactions involve but a few molecular species, each of which is present in a very large number of copies. The converse situation is the rule in molecular evolution the numbers of different polynucleotide sequences that may be interconverted through replication and mutation exceed by far the number of molecules present in any experiment or even the total number of molecules available on earth or in the entire universe. Hence the applicability of conventional kinetics to problems of evolution is a subtle question that has to be considered carefully wherever a deterministic approach is used. We postpone this discussion and study those aspects for which the description by differential equations can be well justified. 

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