INDEX origin

The concept of the molecular connectivity index (originally called branching index) was introduced by Randic [266]. The information used in the calculation of molecular connectivity indices is the number and type of atoms and bonds as well as the numbers of total and valence electrons [176,178,181,267,268]. These data are readily available for all compounds, synthetic or hypothetical, from their structural formulas. All molecular connectivity indices are calculated only for the non-hydrogen part of the molecule [269-271]. Each non-hydrogen atom is described by its atomic 6 value, which is equal to the number of adjacent nonhydrogen atoms. For example, the first-order Oy) molecular connectivity index is calculated from the atomic S values using Eq. (38) ... 

A simple method for assessing the ability of a particular composition to bum is the "Propagation Index," originally proposed by McLain and later modified by Rose [3, 91. The original McLain expression was... 

Abstracts are brief summaries of articles or papers. They are usually compiled and indexed—originally in bound volumes but increasingly available online. Some examples of indexes where you might retrieve literature related to gun control include ... 

Note that D and JF do not appear separately in (8.6) and (8.7) but only in the combination D + /JF/co, which we may interpret as the total electric displacement and assume that D in (8.5) is this quantity. In fact, we could have done this in previous chapters but refrained from doing so because the notion of conductivity is well established. However, it is not possible to determine from macroscopic experiments of the type discussed in this book if the imaginary part of the refractive index originates from free or bound charge currents. Thus, we need not make separate assumptions about the relations between D and E and between JF and E. 

A topological index, originally simply called by the author Molecular Topological... 

In this version, no assumptions, such as a normal distribution, are made about the index (original) data. It is executed generally as follows (14, 24) ... 

A Wiener-type index, originally called MPS topological index [ Ivanduc and Balaban, 1994b]... 

A topological index, originally called by the author Molecular Topological Index, derived from the adjacency matrix A, the distance matrix D, and the A-dimensional column vector v constituted by the vertex degree 5 ofthe A atoms in the H-depleted molecular graph [Schultz, 1989]. The Schultz index is defined as... 

OI A, 2014. Original Eco Index. Available from https //www.ontdoorindnstry.org/responsibility/ indexes/original.hlnil (accessed 09.04.14). 

In the Carbo index, the denominator is the geometric mean of the self-similarities. Naturally, we could also think about using the arithmetic mean, which gives rise to the Hodgkin-Richards index " " " originally developed for comparisons of electrostatic potentials ... 

Initial Wind Chill This index originally resulted from measurements of the rate of cooling of a container of water. Antarctic explorers measured the cooling power of wind at some temperature in comparison to the equivalent cooling power of still air at another temperature. The resulting equation derived from the study underestimated the time to freezing and overestimated the chilling effect of the wind. 

Let s start with the number of chemical substances in existence. These values represent the number of chemicals designated by a Chemical Abstracts Service (CAS) number. The index originated in 1965 and reflects the registry s efforts to track back through the chemical literature since the early 1900s to... 

Since the model parameters are uncertain, it follows from (4) that also the failure probability Pj and the reliability index P are uncertain. Hence, the random variables P = P/0) and B = P(0) can be introduced. As random variables, P and B have probability density functions, namely fp(Pj) and fg(P) respectively, and characteristics, such as a mean (Pp and Xb) and a variance (Op and Op ). The latter expresses the uncertainty of the estimate of the failure probability or reliability index, originating from the parameter uncertainties. Since parameter uncertainties can be reduced by gathering additional information, these variances can also be reduced. 

Comparable to Or, Orr expresses the uncertainty of the estimate of the robustness index, originating from the parameter uncertainties. The uncertainty of the estimate of the robustness index can be reduced by gathering additional information, since parameters uncertainties can be reduced. 

The study of chemical databases and chemical information retrieval is a specialized sub-domain of information retrieval (IR), which itself is one of the major fields of study in information science . Many of the principles of design of chemical databases and their indexing originated in conventional text IR research, and an air of cross-fertilization persists. 

The correlation of the FI with continuous cropland demonstrated, for the first time, a possible link between land cover, DOM character, and aromaticity. The BIX index, originally developed to compare peaks M and C in marine and estuarine environments, was applied to a terrestrial environment and was shown to correlate with total dissolved nitrogen. This is likely to be a co-relationship, with increased microbial productivity leading to increased fluorescence in the peak M and peak T regions, increasing the value of this index due to eutrophication. 

---