Weight counting

Select sum(weight count matches( 1,smarts)) From amw EOSQL Language SQL ... 

Connectivity index The molecular connectivity index is a term used to describe molecular structure in terms of the adjacency of each atom in the molecule. A well-known molecular connectivity index is the y-index of Kier and Hall which basically reflects a weighted count (based on the connectivity of each atom) of bonds and connected sets of bonds in a molecule. 

The molecular connectivity indexes represent molecular structure in a manner analogous to the count of carbon atoms, but in a much more general way. That is, chi indexes are weighted counts of structure features with the same mathematical qualities as counts, but with much more structure information. 

The typical light scattering curves (Sjoblom, 1978) show the increase of scattered intensity characteristic of micellar formation first at relatively high water concentrations. The example in Fig. 5 is from microemulsions with 50% by weight hexadecane stabilized by potassium oleate and pentanol (Sjoblom, 1978). The scattering intensity below a water concentration of 30% by weight (counted on water, svirfactant. 

Apart from simple in-process controls (visual observations, recording pH-values, weights, counting, etc.) it is also possible to perform analyses. For this, large scale production utilises the term Process Analytical Technology (PAT). PAT utilises a diverse array of analytical in-process controls such as near-infrared spectroscopy (NIR, see Fig. 17.3) to quantify water content, particle size, and homogeneity of mixtures. 

The excess heat of solution of sample A of finely divided sodium chloride is 18 cal/g, and that of sample B is 12 cal/g. The area is estimated by making a microscopic count of the number of particles in a known weight of sample, and it is found that sample A contains 22 times more particles per gram than does sample B. Are the specific surface energies the same for the two samples If not, calculate their ratio. 

One way to describe this situation is to say that the colligative properties provide a method for counting the number of solute molecules in a solution. In these ideal solutions this is done without regard to the chemical identity of the species. Therefore if the solute consists of several different components which we index i, then nj = S nj j is the number of moles counted. Of course, the total mass of solute in this case is given by mj = Sjnj jMj j, so the molecular weight obtained for such a mixture is given by... 

The solute molecular weight enters the van t Hoff equation as the factor of proportionality between the number of solute particles that the osmotic pressure counts and the mass of solute which is known from the preparation of the solution. The molecular weight that is obtained from measurements on poly disperse systems is a number average quantity. 

Knitted fabric constmction characterization is discussed in ASTM D3887. Characterization of knitted fabrics includes yield (area per weight), width, length, and yam count (number of courses and wales per unit length). The type of knit is also specified, eg, warp knit or weft knit. Yarn analysis may be difficult on account of problems in raveling individual yams from the knitted stmcture, particularly warp knits. 

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