Parameter insensible

Moisturization in skin can be measured in a variety of ways, some of the more common of which are summarized in Table 31.3. It can be measured directly as an increase in hydration in skin or improvement in clinical and sensory symptoms resulting from the improved hydration state of skin. At the most basic level, consumer perceptions can provide a measure of skin feel and appearance but more often are used to quantify the sensory aspects that cannot be measured instrumentally.45 Expert clinical grading provides a more refined quantitative measure of appearance 46 The human eye is still the most powerful tool for discriminating subtle changes in appearance 47 However, bioinstrumentation is required to measure insensible parameters such as the hydration level in skin.48-50 While methods based on electrical properties of skin are widely used to indirectly measure water content, Near-Infra Red and Raman Spectroscopic techniques are more closely reflective of the actual hydration state.51,52... 

A basic kinetic parameter may or may not influence the observations in a particular experiment. If the observational parameters are not functions of a particular basic parameter, the basic parameter can be changed without affecting the observations. Such a parameter is insensible in the experiment and is called an insensible parameter. If a basic parameter does influence the observations in an experiment, it is sensible by that experiment. However, a sensible parameter may or may not be uniquely determined (identifiable) by the experiment. In each of the above examples, there were sensible parameters that were identifiable and others that were not identifiable. 

Examine the columns of g. For the insensible parameters the corresponding columns have only zero entries. 

Suppose we delete the columns of g corresponding to the insensible parameters to form the matrix g. and also delete the insensible parameters from the parameter vector. Then the normal equations corresponding to the sensible parameters are given by... 

The basic parameters are the system invariants (kinetic parameters of the system) plus possibly some parameters introduced by the experimental design. For a given experiment, they may be (i) insensible, i.e., do not influence the observations, or (ii) sensible, i.e., influence the observations in the experiment. In that case, they may be (a) identifiable or (b) nonidenti-fiable. 

The most important parameter for these evaluations is the shift of the onset potential for the ORR when ethanol is present in the solution and therefore, the increase in cathode overpotential [19]. The PtiCoi/C cathode clearly shows a high selectivity for the ORR. The characteristics of the curves indicate the high insensibility of the PtCo material to the presence of the organic molecule. The PtiCoj/C cathode also showed a higher mass activity for the ORR when compared to a PtsCri/C cathode [19]. 

The results obtained using reduced parameter sets indicated that the complexity factors that air traffic controllers did not find important are not important indeed, so the method used for gathering information on complexity factors was proven suitable. It was also proven that complexity factors that are calculated through complicated mathematical formulae (divergence, convergence and insensibility) are not indispensable for neural network... 

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