Disparity index

Even unifying information about a very specific field such as the pharmacology of discrete drugs is a monumental task. The primary reason for this difficulty is the disparity of purpose between various information sources. Consider how different the purposes are ofWDI (World Drug Index) [20], PDR (Physician s Desk Reference) [21], MSDS (Material Safety Data Sheets) [22] and REG (Chemical Abstracts Registry) [23], each of which has a different natural data model. 

As one increases the indexing, the disparity between the number of Cartesian functions and the number of canonical functions increases. Thus, with f-type GTOs (indices summing to 3) there are 10 Cartesian functions and 7 canonical functions, with g-type 15 and 10, etc. GTOs can be taken arbitrarily high in angular momentum. 

The dielectric constant of coal is strongly dependent on coal rank (van Krevelen, 1961 Speight, 1994, and reverences cited therein). For dry coals the minimum dielectric constant value is 3.5 and is observed at about 88% w/w carbon content in the bituminous coal range. The dielectric constant increases sharply and approaches 5.0 for both anthracite (92% carbon) and lignite (70% carbon). The Maxwell relation which equates the dielectric constant to the square of the refractive index for a polar insulators generally shows a large disparity even for strongly dried coal. 

The series has not for many years possessed a subject index. In a series of this type in which any one volume contains contributions on a number of disparate topics, a subject index covering a single volume is not especially useful. However, a subject index appearing periodically should be of considerably greater utility to readers. Therefore, with Volume 40, subject indexes will appear in every fifth volume. The subject index for Volume 40 will be cumulative, covering Volumes 1-40 subsequent subject indices will cover just the preceding five volumes, e.g., that of Volume 45 will cover Volumes 41-45. 

Orientation Index (01) - This is a factor that characterizes the orientation of polymers in polytet-rafluoroethylene tubing in machine and transverse directions. Orientation index (01) provides a numerical value to monitor the disparity of orientation ... 

Molecular Similarity and QSAR. - In a first contribution on the design of a practical, fast and reliable molecular similarity index Popelier107 proposed a measure operating in an abstract space spanned by properties evaluated at BCPs, called BCP space. Molecules are believed to be represented compactly and reliably in BCP space, as this space extracts the relevant information from the molecular ab initio wave functions. Typical problems of continuous quantum similarity measures are hereby avoided. The practical use of this novel method is adequately illustrated via the Hammett equation for para- and me/a-substituted benzoic acids. On the basis of the author s definition of distances between molecules in BCP space, the experimental sequence of acidities determined by the well-known a constant of a set of substituted congeners is reproduced. Moreover, the approach points out where the common reactive centre of the molecules is. The generality and feasibility of this method will enable predictions in medically related Quantitative Structure Activity Relationships (QSAR). This contribution combines the historically disparate fields of molecular similarity and QSAR. 

This notion re-emerged as important in a very different context. Look at a well-known printed chemical subject index, and you will note that the number of entries under different headings is very disparate there too. This effect is due to the structure of the subject in question, and to the vocabulary used. It turns out that indexers description of the content of a particular document differs in ways influenced directly by their estimation of the number of postings expected at particular subject headings - and that one might therefore be able to capture decisions made by indexers which would reveal the microstructure of conceptual fields - what today would be called the knowledge structure of the domain. In order to capture these relations it was necessary to compare two entries, and identify variant subject descriptions by first isolating the common parts of the two entries. 

Keshaviah PR. 1995. The solute removal index—A unified basis for comparing disparate therapies. Petit Dial Int 15 101-104. 

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