Composite domains

All poly(HASCL) depolymerase proteins have a composite domain structure (Fig. 2) and consist of ... 

The angular position of the peak then remained almost unchanged. No other peak appeared in the 0.5composition domain, where stage 1 is expected to form according to the stage 2 - stage 1 two-phase model. Such a model has been widely used in the literature to explain the flat voltage... 

DiSalvo et al.9 have carried out a systematic survey of intercalation compounds of 2H(a)-TaS2 with post-transition metals. In particular, the system SnxTaS2 was found to exist in two composition domains, 0 < x < /3 and x = 1. The following discussion briefly describes the techniques used by DiSalvo to synthesize the compound SnTaS2. Syntheses of other transition and post-transition metal intercalation complexes with the layered transition metal dichalcogenides are discussed in References 9 and 20-24. 

Fig. 1.1.17 Composition domains of well-defined particles formed by aging at 90"C for 1 h solutions containing zinc nitrate and different bases. TEA triethanolamine En ethylenedi-amine. (From Ref. 110.)...

Figure 1. Pressure evolution in clay for an infinite composite domain...

Poisoning studies carried out by several groups have shown that the equivalents of poison needed to quench the catalytic activity of the dealuminated Y-type zeolites are much less than the number of Alf atoms. Beyerlein et al. (9) reported that residual sodium cations extensively decreased the isobutane cracking activity of steam-dealuminated Y-type zeolites. From their results it was concluded that only one-third of the Alf atoms were associated with strong acidity throughout the Si/Al > 5 composition domain. 

ALHA773071 CO3.0 Si-Fe-Mg amorphous material, olivine, troilite, Fe,Ni metal, magnetite Mainly submicron crystalline phases embedded in amorphous silicate. Distinct compositional domains... 

Krambeck, F. J., Accessible composition domains for monomolecular systems. Chem. Eng. Sci. 39, 1181 (1984b). 

The semianalytical method developed earlier can be used to solve partial differential equations in composite domains also. Mass or heat transfer in composite domains involves two different diffusion coefficients or thermal conductivities in the two layers of the composite material.[6] In addition, even in case of solids with a single domain and constant physical properties, the reaction may take place mainly near the surface. This leads to the formation of boundary layer near one of the boundaries. In this section, the semianalytical method developed earlier is extended to composite domains. 

When mass or heat transfer in composite domains are modeled, different thermal diffusivities or diffusion coefficients enter in the governing equation for each region and the mass/heat flux is continuous at x = a. Equation (5.33) can be converted to the finite difference form as ... 

The procedure involved in solving PDEs in a composite domain can be summarized as follows ... 

The error has reduced significantly from 5% to 2%. Hence, we conclude that stiff PDEs with boundary layers can be solved efficiently by dividing the region as two composite domains. 

In section 5.1.6, semianalytical technique was extended to composite domains. Many chemical problems with mass transfer or kinetics limitations form a boundary layer near the surface. These problems can be handled conveniently by splitting the domain to composite domain as illustrated in this section. In addition, composite solids (composite electrodes) with different physical properties can be handled by this technique. Eight examples were given in this chapter. 

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