INDEX AIDS

Chemical formula codes, like empirical formula indexes, depart from the alphabetic base. Another type of special indexing aid which remains on the alphabetic base is foupd in subject heading lists. A few enthusiasts see a master subject heading list as the panacea for every ill our documentation flesh is heir to. Their opposites, also few in number, see all woe and no weal. 

Certain other interrelations of indexes are helpful in searching. The Ring Index aids in the use of the Subject Index, for example. Another example is the use of the Author Index to learn of possible other related work of an author when his work on some subject of interest has been discovered by use of the Subject or Formula Index. 

Chemical formula codes, like empirical formula indexes, depart from the alphabetic base. Another type of special indexing aid which remains on the alphabetic base is found... 

Smith, H.M. (1940), "Correlation index to aid interpreting crude oil analysis". US Bureau of Mines, techn. paper No. 610, p. 54. 

MOPAC (freeware) Victor Lobanov, 1996, University of Florida ccl.net (http //ccl.net/cca/software/MS-DOS/mopac for dos/index.shtml) go to ccl.net MS-DOS mopac for dos mopac for dos.zip and unzip See Stewart, J. J. P, Computer-Aided Molecular Design 1990, 4, 1. 

Whereas there is no universally accepted specification for marketed natural gas, standards addressed in the United States are Hsted in Table 6 (8). In addition to these specifications, the combustion behavior of natural gases is frequently characteri2ed by several parameters that aid in assessing the influence of compositional variations on the performance of a gas burner or burner configuration. The parameters of flash-back and blow-off limits help to define the operational limits of a burner with respect to flow rates. The yeUow-tip index helps to define the conditions under which components of the natural gas do not undergo complete combustion, and the characteristic blue flame of natural gas burners begins to show yellow at the flame tip. These... 

The border line is now adjusted upon the point of intersection of the crossed lines by slightly inclining the double prism to the telescope by means of the alidade. The position of the pointer on the graduation of the sector is then read off by the aid of the magnifier attached to the alidade. The reading supplies the refractive index itj of the substance under investigation itself, without any calculation. 

No references to the original literature are given in the text. This is because the introduction of such references would have considerably increased the size and therefore the price of the book. However, a discussion on the literature of analytical chemistry is given in the Appendix. With the aid of the various volumes mentioned therein — which should be available in all libraries of analytical chemistry — and the Collective Indexes of Chemical Abstracts or of British Chemical Abstracts, little difficulty will, in general, be experienced in finding the original sources of most of the determinations described in the book. 

When testing for a tannin reserve or tannin index, the presence of natural color aids detection. Testing for tannin is simple and relatively accurate using either a permanganate reduction test (development of permanent purple color) or lignin/tannic acid polymer test (tungstate blue color). 

In Chemical Abstracts and in Beilstein specific azo compounds are found under the heading diazenes . As their systematic nomenclature may be very complex (polyazo dyes ), it is much easier to search for them with the aid of the Formula Index of Chemical Abstracts. 

This author index is designed to enable the reader to locate an author s name and work with the aid of the reference numbers appearing in the text. The page numbers are printed in normal type in ascending numerical order, followed by the reference numbers in parentheses. The numbers in italics refer to the pages on which the references are actually listed. 

Charge the OH functional urethane water dispersion prepared in Example 8 (200 g, 0.1603 eq. OH) to a suitable container. Vigorously stir the dispersion with a mechanical stirrer and slowly add the 18.8% NCO water-dispersible polyisocyanate described above (40.0 g, 0.1791 eq.). This will give an NCO-OH equivalent ratio (index) of 1.12. To this mixture, add Silwet L-77 (a flow aid from OSi Specialties) and thoroughly mix. Use a draw-down bar to make 6-mil (0.006-in.) wet-thickness films on glass plates and 5-mil (0.005-in.) films on Bonderite-treated steel panels (Bonderite is from Henkel). Condition the resultant films at 72°F and 50% RH for 2-3 weeks before evaluating. For the finished... 

Dr. L. T. Capell has again compiled the subject index. The editorial assistance rendered by Edgar E. Dickey and Mary Grace Blair has been greatly appreciated. Dr. Claude S. Hudson has given invaluable aid in the editing of this and the preceding volume. 

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