Homogeneous structure

Here, of course, we may expect also an appearance of thixotropic phenomena, because a transition from the structure changed by deformation to a conventionally homogeneous structure of a filled system occurs rather slowly. And if an investigator at different moments of time deals with different structure of the medium, its properties will be different. 

The presence of the additive results in the formation of a homogeneous structure of the plugging rock, with an improved uniformity of the phase composition of the system and a more compact distribution of the dispersed particles. An increased strength of the cement rock is also obtained. 

Since all the scatterers are identical, their structure factors can be normalised to unitary structure factors, as is always the case for homogeneous structures of normal scatterers [41] ... 

Charcoals and various carbon blacks show great variability of their structure and properties as a function of the carbonaceous starting material and the preparation conditions [3, 11]. The graphitization of carbon, which is required to achieve a high corrosion resistance, lead to materials of more homogeneous structures and properties, allowing a good reproducibility of reactions. 

Electron microscopy photographs of classic irregular (A) and spherical (B) silica gels and high purity, spherical silica gel (C), whose purity is over 99.99%, are shown in Figure 3.2. The surface of pure silica gel is very smooth and physically very stable due to the homogeneous structure. Modification of the... 

Terms such as symmetric and asymmetric, as well as microporous, meso-porous and macroporous materials will be introduced. Symmetric membranes are systems with a homogeneous structure throughout the membrane. Examples can be found in capillary glass membranes or anodized alumina membranes. Asymmetric membranes have a gradual change in structure throughout the membrane. In most cases these are composite membranes... 

The nucleosome core particle is a relatively stable and homogenous structure that is easily prepared, and as such has formed the basis for numerous studies into chromatin structure and function. However, several recent studies have suggested that what is true for the nucleosome core may not always be true for nucleosome arrays, nor even for nucleosomes containing linker DNA. For example, the core histone tails preferentially interact with linker DNA when is it present, whereas they are constrained to bind intranucleosomal DNA in core particles [46 8]. Consequently, the activities of proteins that require access to the tails or the DNA may be affected, and it has been shown that both DNA ligase and P/CAF are less active on nucleosome core particles than other chromatin substrates [49,50]. Similar concerns apply to the interaction of HMGN proteins with nucleosome core particles, and results from studies of these complexes must be considered in the wider context of how these proteins may interact with nucleosome arrays. 

The ultimate strength and properties of many materials are dependent upon the intimate contact between the various members. Thus, for ceramics, nano-sized particles allow a more homogeneous structure resulting in stronger ceramic materials. 

Homogeneous structure consists of polycrystalline granular aggregate of aragonite crystals of varying sizes. 

Class III the least homogeneous structure it is characterized by the presence of interdendritic, copper-rich eutectic. Figure 3 shows the metallurgical structure typical of this class. The Silver Nail and the Bull Bowl are representative of this class. 

If we exclude the case of pre-existing order, we have so far considered a network as a random, but completely homogeneous structure. It should now be mentioned that the crosslinking process itself may give rise to "aggregation of network elements and therefore, in the swollen state, to significant fluctuations in segment density. 

Comprehensive investigations into brittleness of some crystals determined with a Vickers pyramid led Ikornikova and Khrenova (1951) to establish that crystals of mosaic structure with traces of plastic deformation are more brittle than similar crystals of homogeneous structure. Moreover it has been found (Glazov and Vigdorovich, 1969) that as the mean square displacement of the lattice structural components diminishes, in other words, as the mobility of these components diminishes with propagation of elastic waves, the ultimate effect is increased material brittleness. 

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