INDEX rules

IfMRjRa = SiMe2 for (XIII), the derivative would be 9.9-dimethyl-9,10-dihydro-9-silaanthracene or, according to the Ring Index rules, 5,5-dimethyl-5,10-dihydrodibenzo[i,e]silicin. ... 

Entry Number Index rule Abstract Found given... 

The computer is a powerful but literal-minded servant and naive attempts at retrieving references may lead to being swamped, like the sorcerer s apprentice. On the other hand, unfamiliarity with some habitual indexing rule may cause relevant papers to be missed. Trained search editors, thoroughly familiar with the indexing rules, are therefore used to prepare the formulations. However, the final arbiter as to what is relevant, is the scientist-user. The channel of communication between him and the search editor makes or breaks the service. To this end, appreciation courses are organised and staff from almost every medical and pharmaceutical library in the UK have attended them. There is also an explanatory handbook available on request. 

It is not as easy when a chemical name is used, because it needs to be indexed following the Chemical Abstracts indexing rules (Sect. 2.1.3). Online searching is subject to even more regulations. Greek letters must be transformed into words and put between full stops (P ->. beta.), words that are otherwise used by the retrieval language, must be put between quotation marks. 

The increased exposure to the reservo/r results from the long horizontal sections which can be attained (between 500m and 1000m horizontal section is now common). Because the productivity index is a function of the length of reservoir drained by a well, horizontal wells can give higher productivities in laterally extensive reservoirs. As an initial estimate of the potential benefit of horizontal wells, one can use a rough rule of thumb, the... 

In general, the first step in virtual screening is the filtering by the application of Lipinski s Rule of Five [20]. Lipinski s work was based on the results of profiling the calculated physical property data in a set of 2245 compounds chosen from the World Drug Index. Polymers, peptides, quaternary ammonium, and phosphates were removed from this data set. Statistical analysis of this data set showed that approximately 90% of the remaining compounds had ... 

The lUPAC rules are not the only nomenclature system in use today Chemical Abstracts Service sur veys all the worlds leading scientific journals that publish papers relating to chemistry and publishes brief abstracts of those papers The publication Chemical Abstracts and its indexes are absolutely es sential to the practice of chemistry For many years Chemical Abstracts nomenclature was very similar to lUPAC nomenclature but the tremendous explosion of chemical knowledge has required Chemical Abstracts to modify Its nomenclature so that its indexes are better adapted to computerized searching This means that whenever feasible a compound has a sin gle Chemical Abstracts name Unfortunately this Chemical Abstracts name may be different from any of the several lUPAC names In general it is easier to make the mental connection between a chemical structure and its lUPAC name than its Chemical Abstracts name... 

Alumina Trihydrate. Alumina trihydrate is usually used as a secondary flame retardant in flexible PVC because of the high concentration needed to be effective. As a general rule the oxygen index of flexible poly(vinyl chloride) increases 1% for every 10% of alumina trihydrate added. The effect of alumina trihydrate on a flexible poly(vinyl chloride) formulation containing antimony oxide is shown in Figure 5. 

Perhaps the most notable aspect of the history of the API operation is that it has been shaped at every step by those who use the system. Created by information speciaHsts within the petroleum iadustry, it has beea governed by a technical information committee made up of company representatives, and guided by a series of iadustry task forces, which have modified as aeeded the indexing thesaums, subject selectioa guideliaes, and selection rules for countries ia pateat coverage, journals, and other sources ia the aoapateatHterature. 

The work index may be round experimentally from laboratoiy crushing and grinding tests or from commercial miU operations. Some rules of thumb for extrapolating the work index to conditions different from those measured are that for dry grinding the index must be increased by a factor of 1.34 over that measured in wet grinding for open-circuit operations another factor of 1.34 is required over that measured in closed circuit if the product size Xp is extrapolated below 70 [Lm, an additional correction factor is (10.3 + Xp)/l.l45X . Also for a jaw or gyratory crusher the work index may be estimated from... 

Selection of a name for a specific compound is heavily influenced by the purpose at hand communication to a general audience, communication with specialists, or storage/retrieval through archival indexes. The first requires the simplest rules possible the second requires the shortest names possible and the third requires rigid adherence to a set of rules that will reliably generate a unique name. The name chosen may be different for each situation, although that is not necessarily so. 

The fusion name l//-triazolo[4,5-d]pyrimidine for (140) is preferred by practitioners in the field and appears in CA indexes. On the other hand, the nonspecialist, who may well be uncertain about his command of fusion nomenclature, might more easily grasp the replacement name l//-l,2,3,4,6-pentaazaindene. (This is an appropriate place to emphasize that, by lUPAC rules, replacement names are to be based only on a completely carbocyclic parent. Notwithstanding the attractive simplicity of 8-azapurine for the example at hand, it has no sanction see, however. Section 1.02.3.2. The purpose of this avoidance is to forestall a multiplicity of names for systems containing several hetero atoms.)... 

The learning element consists of a Performance Index (PI) table combined with a rule generation and modification algorithm, which creates new rules, or modifies existing ones. The structure of a SOFLC is shown in Figure 10.17. With SOFLC it is usual to express the PI table and rulebase in numerical, rather than linguistic format. So, for... 

For industrial applications, hydraulic oil viscosity is typically approximately 150 SUS at 100°F. It is a general rule that the viscosity should never go below 45 SUS or above 4000 SUS, regardless of temperature. Where temperature extremes are encountered, the fluid should have a high viscosity index. 

Particles may be indexed by a canonical code, defined to be the smallest binary number representing an intermediate state of a given paiticle. Empirically derived properties of particles with canonical codes with widths tv < 16 evolving under a radius-r PFA rule, are summarized in table 3.4 [park86]. 

Consider a size N one-dimensional lattice with site variables Si t) = 1, i = On even (or odd) time steps, either even-indexed (or odd-indexed) sites evolve according to fixed probabilistic peripheral rules that is, according to rules that depend only on the values of a given site s neighboring sites. Such rules are completely specified by a set of four conditional probabilities, 0 < Ui < 1, i = T...4 ... 

Consider an isotropic version of the elementary peripheral PCA introduced above, this time also with binary site variables time steps according to a set of rules determined by three conditional probabilities, po, p and p2 -... 

We note that (1.12) relates to the cycle index (1.16) like (1.15) (taking (1.12) and (1.14) into account) to (1.17). The following definitions allow us to state the rules on the construction of the generating functions in a unified way. To introduce the functions /(x), f(x,y) into the cycle index means putting... 

In this book we use the Nomenclature of Organic Chemistry of the International Union of Pure and Applied Chemistry, 1979 Edition ( Blue book , IUPAC, 1979), the Revised Nomenclature for Radicals, Ions, Radical Ions, and Related Species (IUPAC, 1993), and additional rules applied by the Chemical Abstracts Service for the 1987-1991 Index Guide Chemical Abstracts, 1992). 

---