Quasi-homogeneous structure

Fig. 29a and b. Structure of the shear zone at various temperatures in PP a T = —196 °C, two sets of discrete shear band A and B, b T = —40 °C, diffuse shear zone with quasi-homogeneous deformation of spherulites... 

An exact and complete description of the effective properties of a composite may be obtained if the detailed distribution of physical fields in all components of the composite is known—for example, based on the concept of a quasi-homogeneous medium [49]. The problem of defining the distribution of physical fields in components of a composite with chaotic structure is rather... 

Figure 3 Examples of regimes found in range II (medium values of a), (a) regime dominated by purely two-dimensional overlap (of the hydrophobic coils here). Within this regime, there is no increase of the thickness of the hydrophobic layer when the surface concentration increases, with y = 3 the coils are in the excluded volume geometry. (b) regime dominated by a partial three-dimensional growth of the hydrophilic coils which form quasi-brush structures. In this regime, the contribution of the hydrophobic coils is independent of the surface concentration because they form a quasi-homogeneous layer, the value of y being 1, whatever the quality of the solvent...

As can be nicely seen in Fig. 24, the configuration of two enantiomers is found to be unique in all structure calculations using the distance geometry, floating chirality protocol, whereas a quasi-homogenous distribution of chiralities is found without experimental restraints. Thus, it is possible to determine relative configurations in rather complicated molecules by this approach. 

When metallic glasses begin to experience plastic deformation at temperatures well below Tg they tend to undergo rapid localization of deformation into shear bands (Spaepen 1977 Argon 1979). However, the localization of deformation by a perturbation in flow is always preceded by a brief stretch of quasi-homogeneous plastic flow (Section 7.8). The discussion of this must await the development of an essential understanding of evolutionary processes of plastic-strain-induced structural alterations in Section 7.6. 

So, it appears that sorption of copper ions by Na-form of the sorbent may be analysed in terms of quasi-homogeneous model of the sorbent because diffusion coefficients in the regions between the fibrillas and within them are comparable whereas the H-form has heterogeneous structure with two diffusion coefficients. 

If the walls of a porous structure are subjected to a through diffusion saturation, thick (tens and hundreds of micrometers) quasi-homogeneous diffusion layers are obtained, and this method can replace epitaxy (Astrova et al. 2000). Similarly, full thermal oxidation of silicon walls makes it possible to obtain thick oxide layers, which are used, e.g., for thermal insulation purposes (Kan and Finstad 2005 Barillaro et al. 2003). The increasing volume of the oxide leads to filling of pores, which enables, at a correct choice of the porosity (<56 %), formation of a thick monolithic... 

In order to investigate the influence of the matrix structure our experiments were extended to dye-doped rare gas mixtures of argon and xenon. In these matrices the transition, from polycrystalline pure rare gas matrices to amorphous mixed rare gas solids, can be monitored by varying the composition ratio. At the transition to the amorphous state the quasi-homogeneous line width revealed no increase, which can be attributed to the high degree of structural disorder already present in the condensed pure rare gas matrices. 

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