Independent parameters

Figure 2 shows similar results for ethanol(1)-n-hexane(2) at 1 atm. The liquid-phase enthalpy of mixing was again estimated from UNIQUAC using temperature-independent parameters. 

CHECK CONTROL IKEY). IF -I OR 0 CALCULATE TEMPERATURE INDEPENDENT PARAMETERS. 

Under equiUbrium or near-equiUbrium conditions, the distribution of volatile species between gas and water phases can be described in terms of Henry s law. The rate of transfer of a compound across the water-gas phase boundary can be characterized by a mass-transfer coefficient and the activity gradient at the air—water interface. In addition, these substance-specific coefficients depend on the turbulence, interfacial area, and other conditions of the aquatic systems. They may be related to the exchange constant of oxygen as a reference substance for a system-independent parameter reaeration coefficients are often known for individual rivers and lakes. 

Parachor is the name (199) of a temperature-independent parameter to be used in calculating physical properties. Parachor is a function of Hquid density, vapor density, and surface tension, and can be estimated from stmctural information. Critical constants for about 100 organic substances have been correlated to a set of equations involving parachors and molar refraction (200). 

Dimensional analysis leads to various dimensionless parameters, wliieli are based on the dimension s mass (M), length (L), and time T). Based on these elements, one ean obtain various independent parameters sueh as density (p), viseosity (/i), speed (A ), diameter ( )), and veloeity (V). The independent parameters lead to forming various dimensionless groups, whieh are used in fluid meehanies of turbomaehines. Reynolds number is the ratio of the inertia forees to the viseous forees... 

The terms that are linear in the stresses are useful in representing different strengths in tension and compression. The terms that are quadratic in the stresses are the more or less usual terms to represent an ellipsoid in stress space. However, the independent parameter F,2 is new and quite unlike the dependent coefficient 2H = 1/X in the Tsai-Hill failure criterion on the term involving interaction between normal stresses in the 1- and 2-directions. 

The model is intrinsically irreversible. It is assumed that both dissociation of the dimer and reaction between a pair of adjacent species of different type are instantaneous. The ZGB model basically retains the adsorption-desorption selectivity rules of the Langmuir-Hinshelwood mechanism, it has no energy parameters, and the only independent parameter is Fa. Obviously, these crude assumptions imply that, for example, diffusion of adsorbed species is neglected, desorption of the reactants is not considered, lateral interactions are ignored, adsorbate-induced reconstructions of the surface are not considered, etc. Efforts to overcome these shortcomings will be briefly discussed below. 

A sample independent parameter is the so-called specific resolution, R,p, which can be obtained from the peak resolution by normalizing the values according to the molar masses of the samples used for testing (24) ... 

The kinetic analysis of the sigmoid pH-rate profile will yield numerical estimates of the pH-independent parameters K, k, and k". With these estimates the apparent constant k is calculated using the theoretical equation over the pH range that was explored experimentally. Quantitative agreement between the calculated line and the experimental points indicates that the model is a good one. A further easy, and very pertinent, test is a comparison of the kinetically determined value with the value obtained by conventional methods under the same conditions. 

The scope of the early papers was to use the SK approach to accurately interpolate the results of first principles calculations of the energy bands and densities of states. An important characteristic of these calculations is that the first, second, and third nearest neighbor interactions are treated as independent parameters, which is advantageous for minimizing the rms deviation from the first principles bands. 

Much of the extensive work on crack velocity described here has been carried out over a long period by Spiedel. Detailed studies of velocity-dependent and velocity-independent parameters reveal how complex the phenomenon is. The three major alloy systems will now be discussed. 

These studies have indicated that the independent parameters controlling the postulated solid-phase reactions significantly affect the resulting acoustic admittance of the combustion zone, even though these reactions were assumed to be independent of the pressure in the combustion zone. In this combustion model, the pressure oscillations cause the flame zone to move with respect to the solid surface. This effect, in turn, causes oscillations in the rate of heat transfer from the gaseous-combustion zone back to the solid surface, and hence produces oscillations in the temperature of the solid surface. The solid-phase reactions respond to these temperature oscillations, producing significant contributions to the acoustical response of the combustion zone. 

Hence use of the normalized distribution function allows a reduction of the number of independent parameters in the kernel (253). 

One can demonstrate that the reactivity pattern correlates with an independent parameter, or fails to do so. 

One can conclude that related reactions adopt the same mechanism if they correlate in a similar fashion to an independent parameter. Or, if the correlations are quite dissimilar, different mechanisms may operate. 

The Lotka-Volterra reaction described in Section 2.5.4 has three initial conditions—one each for grass, rabbits, and lynx—all of which must be positive. There are three rate constants assuming the supply of grass is not depleted. Use dimensionless variables to reduce the number of independent parameters to four. Pick values for these that lead to a sustained oscillation. Then, vary the parameter governing the grass supply and determine how this affects the period and amplitude of the solution. 

Thus, there are only three independent parameters. We take these to be Dr, K, and Xr- Imperfect but generally useful correlations for these parameters are available. For a summary of published correlations and references to the original literature see Froment and Bischoff, Dixon and Cresswell, and Dixon. ... 

Figure 4.3 Radial pentagon representation of reaction mass efficiency (RME) showing dependence on four independent parameters given in equation (4.1).

The Voigt function is a convolution product ( ) between L and G. As the convolution is expensive from a computational point of view, the pseudo-Voigt form is more often used. The pseudo-Voigt is characterized by a mixing parameter r], representing the fraction of Lorentzian contribution, i.e. r] = 1(0) means pure Lorentzian (Gaussian) profile shape. Gaussian and Lorentzian breadths can be treated as independent parameters in some expressions. 

The selectivity for various rotational speeds should be determined with stirrers of small and large Ds/D,-, while maintaining the other design and operating variables constant (see Table 5.4-26). Plots of yields of unwanted products S versus N, x99, and PA r should then be made for both stirrers to determine the independent parameter which best correlates the data for both stirrer systems. 

The number of independent parameters defining a projector proof in matrix representation and resolution of previously conflicting arguments... 

Table 1. Number K of independent parameters in a projector comparison of different published formulae. 

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