Linkage coefficient

Crystal structures entirely composed of triangular prisms are usually classified with respect to the mode of linkage of the centered prisms. The linkage coefficient LC defines the average number of prisms in which T-atoms participate. The... 

The ternary structures of class I (all prism axes parallel) are shown in fig. 8 arranged in the order of increasing value of the linkage coefficient LC. Three examples for class III (three directions of the prism axes) with LC = 6 are shown in fig. 9 and two examples for class Ila (two perpendicular directions for the prism axes) are presented in fig. 10. 

The resulting extinction coefficient remained constant within the accuracy of the measurements. In the transition from monoazo to disazo pigment, however, the value of the maximum molar extinction coefficient is more than doubled, because the effect of the two azo linkages is enhanced by additional interaction via the diphenyl moiety. This, however, does not improve the conjugation the shade does not shift remarkably ... 

The solution of the system of the kinetic eauations with coefficients z gives the dependence of the average number of cross-linkages on the time. 

Further, the electron-transport properties of the polymer 7 were enhanced by extending the separation between the redox center and backbone from a single Os—amino linkage to one that extends over 17 bonds. The goal was to provide mobility of the redox center independently of backbone motion, which is necessarily restricted by cross-linking. The mobility of the redox center can be characterized by an apparent diffusion coefficient, Z app- According to the relation proposed by Blauch and Saveant ... 

The long linkage in compound 7 led to an apparent diffusion coefficient, Dapp, that was a factor of 10 higher than the " 10 cm /s observed for compound... 

Subscript (ads) denotes adsorption via a thiolate linkage, while (ps) stands for a physisorbed and/or adsorbed state via different interactions. However, large dimensions of the studied molecules and their amphiphilic nature make the surface reaction mechanism more complex than in case of cystine/cysteine. Interfacial microstructure plays an important role in the determination of the surface behavior of the adsorbed molecules. From the study on the charge-transfer kinetics, the transfer coefficient a was calculated as slightly less than 0.50, while the rate constant (based on Laviron s derivations [105]) was of the order of 10 s k The same authors [106] have shown earlier that the adsorption rate constant of porcine pancreatic phospholipase A2 at mercury via one of its disulfide groups is of the order of 10 s h... 

Commercial PVC is atactic and has a relatively high Tm (173 0, which is 100 C lower than that of /7-PVC. Because of weak linkages and the presence of some unsaturation, commercial PVC tends to discolor and decompose at normal processing temperatures. More-stable polymers are obtained by the addition of stabilizers or by post-chlorination. Because of the presence of the chlorine pendant group, unplasticized PVC has a higher coefficient of friction than hdpe. 

The degree of dimer formation via a methylene linkage (crosslinking) was estimated by the coefficient of the integrals of the proton NMR spectra of methoxy groups situated adjacent to the newly formed bond—of which the resonances are shifted upfield (63.4-3.7)—and that of the total methoxy resonances (63.4-4.0). 

Tables 3.1, 3.2 and 3.3 compiled by Povarennykh (1963) specify the initial data accepted for the calculation of hardness from formulae (3.5) and (3.6). As the ratio WJWa increases, the coefficient a decreases (Table 3.1). For compounds with ratios inverse to those given in the table, i.e., for compounds having a so-called antistructure, the coefficient a will be exactly the same, e.g., 1/2 and 2/1. In both cases, x — 80. The link attenuation coefficient / varies over a relatively narrow range, usually between 0.7 and 1.0 (Table 3.2). This coefficient requires the state of lattice linkage to be considered in each case, and like coefficient a it depends on the type of compound involved. For various types of compounds, the values of the coefficient / may be lower taking as an example minerals in the pyrite and skutterudite group, they are as follows for compounds 2/2—0.60, for 3/3—0.48 and for 4/4—0.39. The values of the coefficient y grow proportionally with coordination number (Table 3.3). The constancy of the coefficient y depends on the constancy of the coordination number which is influenced by the valence ratio of electropositive and electronegative atoms. Lattice spacings, state of chemical bonds and electron-shell structure, and for complex compounds, also the degree of action of the remain-...

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