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Strong correlation model

In principle, only the expressions for the correct desorption order should give a straight line at higher temperatures. In practice, however, the experimental scatter, possible inaccuracy in corrections of the output data, inherent departures from the simple model considered (mainly the dependence of Ea on 0), together with a rather strong correlation which can be shown to exist between the functions In [(1 /nB) — (l/nB0) ] and ln[ln(na0) — ln(n ) ], can seriously impair the plot and make the estimate of the desorption order rather dubious. Statistical methods should be helpful in this case, but to our knowledge they have not been employed so far. [Pg.374]

The recent report of wave-like patterns of bacteria and water soluble carbon associated with wheat roots (58) which were not strongly correlated with each other or with lateral root formation pose a challenge for models. So do the reports of highly dynamic and erratic population fluctuations of individual pseudomonad clones on sugar beet roots (59). [Pg.351]

The pore geometry described in the above section plays a dominant role in the fluid transport through the media. For example, Katz and Thompson [64] reported a strong correlation between permeability and the size of the pore throat determined from Hg intrusion experiments. This is often understood in terms of a capillary model for porous media in which the main contribution to the single phase flow is the smallest restriction in the pore network, i.e., the pore throat. On the other hand, understanding multiphase flow in porous media requires a more complete picture of the pore network, including pore body and pore throat. For example, in a capillary model, complete displacement of both phases can be achieved. However, in real porous media, one finds that displacement of one or both phases can be hindered, giving rise to the concept of residue saturation. In the production of crude oil, this often dictates the fraction of oil that will not flow. [Pg.351]

A multitude of semiempirical and semiclassical theories have been developed to calculate electron impact ionization cross sections of atoms and atomic ions, with relatively few for the more complicated case of molecular electron impact ionization cross sections. One of the earlier treatments of molecular targets was that of Jain and Khare.38 Two of the more successful recent approaches are the method proposed by Deutsch and Mark and coworkers12-14 and the binary-encounter Bethe method developed by Kim and Rudd.15,16 The observation of a strong correlation between the maximum in the ionization efficiency curve and the polarizability of the target resulted in the semiempirical polarizability model which depends only on the polarizability, ionization potential, and maximum electron impact ionization cross section of the target molecule.39,40 These and other methods will be considered in detail below. [Pg.328]

Strong correlations between relevant variables is not a problem in PLS, and all such variables can be retained in the analysis. In fact, the models derived using PLS become more stable with the inclusion of strongly correlated and relevant parameters. [Pg.399]

Under such circumstances, the E-X and X-Y bond distances should be strongly correlated in C.-T. spoke adducts. In fact, it is well known that for C.-T. spoke I2-adducts with S-donors a reciprocal correlation exists between (f(I-I) and rf(S-I), which was initially proposed by F.H. Herbstein and W. Schwotzer as a hyperbola.46 Assuming a valence (bond order) model for the description of the S-I-I system within C.-T. adducts, with n(I-I) + n(E-I) = 1... [Pg.481]

A great deal more could be said about models - to understand behavior like strong correlation, Coulomb blockade, and actual line shapes, it is necessary to use a number of empirical parameters, and a quite sophisticated form of density functional theory that deals with both static and dynamic correlation at a high level. Often this can be done only within a very simple representation of the electrons - something like the Hubbard model [51-53], which is very common in this situation. [Pg.11]

In refs (Kim,2004 Kim, 2005) we take one step further estimating corrections to the Gaussian effective potential for the U(l) scalar electrodynamics where it represents the standard static GL effective model of superconductivity. Although it was found that, in the covariant pure (f)4 theory in 3 + 1 dimensions,corrections to the GEP are not large (Stancu,1990), we do not expect them to be negligible in three dimensions for high Tc superconductivity, where the system is strongly correlated. [Pg.301]

Subsequently, a more complex PLS-DA model (not shown) was built based on individual classes for each of the 31 obsidian samples in order to identify similarities between samples from different geographical areas. From these results, it was concluded that the South, SE, and West Sugarloaf samples are strongly correlated with each other, as are the Cactus Peak and East Sugarloaf and the West Cactus Peak and Stewart samples. The Cactus Peak, West Cactus, E Sugarloaf and Stewart samples also have similar LIBS features. [Pg.286]

The above inference concerns all chemical pollutants except Fe, Cu, Si, and Ni. The abundance of these elements in melted-snow samples is beyond the limits predicted by the above model of vaporization and consequently can be attributed to non-molecular forms of mass-transfer of these elements. This discrepancy can be explained by some additional sources of contaminants within the considered technology. A comprehensive comparative analysis shows that the most probable form of transferring such elements as Fe, Cu, Si, Ni into the atmosphere and snow are the matte and dust, where they are major chemical elements. A rather strong correlation... [Pg.147]

Relativistic mean field (RMF) models have been applied successfully to describe properties of rinite nuclei. In general ground state energies, spin-orbit splittings, etc. can be described well in terms of a few parameters ref. [18]. Recently it has lead to the suggestion that the bulk SE is strongly correlated with the neutron skin [19, 20] (see below). In essence the method is based upon the use of energy-density functional (EDF) theory. [Pg.101]

Pharmacokinetic/pharmacodynamic model using nonlinear, mixed-effects model in two compartment, best described time course of concentration strong correlation with creatinine clearance predicted concentration at the efi ect site and in reduction of heart rate during atrial fibrillation using population kinetic approach... [Pg.369]


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See also in sourсe #XX -- [ Pg.212 ]




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