Heterogeneous matrices

Calculations of the generalized conductivity (electroconductivity, thermal conductivity, dielectric and magnetic permeability) of heterogeneous systems have been carried out by Kemer and Odelevsky For a matrix heterogeneous system with cubical inchtaons whose centers form a cubic lattice and whose faces are parallel, Odelevsky s relationship may be applied ... 

Release by ingression of environmental agent Chemical erosion of polymer matrix Heterogeneous Homogeneous... 

Spalazzi JP, Doty SB, Moffat KL, Levine WN and Lu HH. Development of controlled matrix heterogeneity on a triphasic scaffold for orthopedic interface tissue engineering. Tissue Eng. 2006 12 3497-3508. 

Spalazzi et al. Tri-phasic Phase I PLGA In v/vo/Rat model with Interface-like matrix heterogeneity... 

Conducting Polymer Blends, Composites, and Colloids. Incorporation of conducting polymers into multicomponent systems allows the preparation of materials that are electroactive and also possess specific properties contributed by the other components. Dispersion of a conducting polymer into an insulating matrix can be accompHshed as either a miscible or phase-separated blend, a heterogeneous composite, or a coUoidaHy dispersed latex. When the conductor is present in sufftcientiy high composition, electron transport is possible. 

Heterogeneous mixture in which finely divided material is distributed throughout the matrix of another material. Distribution of finely divided solids in a liquid or a solid (e.g., pigments, fillers). 

Composite materials have many distinctive characteristics reiative to isotropic materials that render application of linear elastic fracture mechanics difficult. The anisotropy and heterogeneity, both from the standpoint of the fibers versus the matrix, and from the standpoint of multiple laminae of different orientations, are the principal problems. The extension to homogeneous anisotropic materials should be straightfor-wrard because none of the basic principles used in fracture mechanics is then changed. Thus, the approximation of composite materials by homogeneous anisotropic materials is often made. Then, stress-intensity factors for anisotropic materials are calculated by use of complex variable mapping techniques. 

The exponentials Ki and K2 in the model account for the degree of heterogeneity of the interphase layer. The ratio of these exponentials is representative, as suggested in [121], of the load transmission between the fiber and the matrix (the adhesion factor a). 

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