Factor r values

The position of each component of a mixture is quantified by calculating the distance traveled by the component relative to the distance traveled by the solvent. This is called relative mobility and symbolized by Rf. In Figure 3.2D, the R values for components B and C are calculated. The Rf for a substance is a constant for a certain set of experimental conditions. However, it varies with solvent, type of stationary support (paper, alumina, silica gel), temperature, humidity, and other environmental factors. R values are always reported along with solvent and temperature. 

To convert the core area into the pore area ( = specific surface, if the external area is negligible) necessitates the use of a conversion factor R which is a function not only of the pore model but also of both r and t (cf. p. 148). Thus, successive increments of the area under the curve have to be corrected, each with its appropriate value of R. For the commonly used cylindrical model,... 

The overall probability function for the end-to-end distance is the product of these two considerations. Starting at r = 0, the probability increases owing to the r term, passes through a maximum, then decreases as the exponential factor takes over at large r values. 

Returning to the data of Table 7.1, it is apparent that there is a good deal of variability among the r values displayed by various systems. We have already seen the effect this produces on the overall copolymer composition we shall return to the matter of microstructure in Sec. 7.6. First, however, let us consider the obvious question. What factors in the molecular structure of two monomers govern the kinetics of the different addition steps This question is considered in the few next sections for now we look for a way to systematize the data as the first step toward an answer. 

Insulation material R-Factor 7 R-Value 5.3 for thickness in cm 3.5 1.8 Relative cost... 

R-Factor data for phenoHc suppHed by Manvike source for all other R-factors is The Dow Chemical Company. Units of R-factor are (W-cm)/hm -K (= 1.4 Btu-in./h-sq ft°F). R-Value per cm of thickness is the R-factor. R- and R-factors can vary with age and use conditions. Values shown are averages obtained from lab samples. 

Nominal area of conductor (mm-) Rating factor fo C cinAV r value of thermal resistivity of soil in ... 

Figure 10-43A. Predict fouling by nomograph, Part 1. Calculation of R value for fouling factor use in conjunction with Figures 10-43B and 10-43C. (Used by permission Zanker, A., Hydrocarbon Processing. March 1978, p. 146. Gulf Publishing Company, Houston, Texas. All rights reserved.)...

Determine the response factors (r) for the detector relative to phenacetin ( = 1) as internal standard by carrying out three runs, using 1 /rL injection, and obtaining the average value of r. 

Figure A3.2 Graph of the compressibility factor r for a number of gases versus their reduced pressure at several reduced temperatures. Reprinted with permission, taken from Goug-Jen Su, Ind. Eng. Chem.. 38,803 (1946), the data illustrate the validity of the principle of corresponding states. The line is Goug-Jen Su s estimate of the average value for r.

Figure A3.4 Comparison of the experimental r (dashed lines) with the r values calculated from the Soave equation of state (solid lines). Values for the acentric factor are (a) oj = -0.218 (the value for EC), (b) a, = 0.011 (the value for CH4), (c) lU = 0,250 (the value for NEC), and (d) = 0.344 (the value for ECO).

A hydrocarbon is cracked using a silica-alumina catalyst in the form of spherical pellets of mean diameter 2.0 mm. When the reactant concentration is 0.011 kmol/m3, the reaction rate is 8.2 x 10"2 kmol/(m3 catalyst) s. If the reaction is of first-order and the effective diffusivity De is 7.5 x 10 s m2/s, calculate the value of the effectiveness factor r). It may be assumed that the effect of mass transfer resistance in the. fluid external Lo the particles may be neglected. 

Then the reciprocal of the maximum amplitude factor, r l/Pmax is thought to express the induction time for pit generation. Some calculated values are shown in Table 2. 

The values of G2 (calc.), calculated with the final parameters, are given in Table 2, where they are compared with G2 (obs.). Considering that the intensities were estimated visually from photographs, the agreement is excellent. The conventional reliability factor R, as applied here to the G2 rather than to structure factors, i.e. 

There is a small correction factor which takes into account the quenching efficiency of the antibody and the r value for FLPEP on the antibody.)... 

Table IV lists comparative SD and / values for fittings of all of the reactions of Table II and III with each of the gr scales derived in this paper. The comparison includes figures for fittings with F and R values of Swain and Lupton (S L) and fitting with the Hammett equation. We believe the results given in Table IV provide a clear confirmation of the uniqueness and limited generality of the o/2(ba) scale. Very consistently, the fit achieved by the or (BA) scale is shown in Table IV to be superior by significant factors to that achieved by any of the other scales or by the simple op treatment. This fact is clearly reflected in the overall / values and the similarly weighted root-mean-square / values, F = y/lfnif lN, sum taken over all reactions. The value of F is. 067 for the basis sets of Table II (compare with overall / of. 058). The comparable F values are. 140 for Or, . 088 for S L, and. 155 for 0(p) with the data differences as explained in Table IV. For all sets of Table IV, the corresponding figures are. 073 for o (ba). -143 for a%, . 097 for S L, and. 209 for 0(py...

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