Boundary structure

It would appear that the effects of impurities at the grain boundary must be either (a) to increase the diffusion rates or (b) to influence the microstructure and increase the number of short-circuit paths. However, theoretical modelling of the grain boundary structure by Duffy and Tasker and... 

Cakmak M. and Wang M.D., Structure development in the tubular blown film of PP/EPDM thermoplastic elastomer, Antec 89, 47th Annual Tech. Conference of SPE, New York, May 1, 1989, 1756. Hashimoto T., Todo A., Itoi H., and Kawai H. Domain boundary structure of styrene-isoprene block copolymer films cast from solution. 2. Quantitative estimation of the interfacial thickness of lamellar microphase systems. Macromolecules, 10, 377, 1977. 

Once chirality is induced and amplified by some mechanism, the excess must first persist and then propagate in order to survive. A distinctive characteristic of homo-chiral protein and nucleic acid biopolymers is that they function within the enclosed environment of cells, which provide a membranous boundary structure that separates the intracellular components from the external environment. It has accordingly been postulated frequently that analogous but simpler enclosed environments must have been available and operative on the primitive Earth. 

In the absence of an electric field, E, there is a dynamic equilibrium between two proton boundary structures, but when E is present, the weight of boundary structure II is increased because the hydrogen bond is easily polarized. Furthermore, the... 

Fig. 8 reveals that under the assumption of reasonable values for the adjustable parameters in Eq. (7) the theoretical predictions compare well to the experimental data. The very different behaviour of special and non-special boundaries reflects an influence of grain boundary structure on grain boundary migration mechanism. In particular, impurities not only may have an effect on migration by impurity drag, but also by changing grain boundary structure itself. This was shown recently by Udler and Seidman in a Monte Carlo... 

Deamer, D. W. (1985). Boundary structures are formed by organic components of the Murchison carbonaceous chondrite. Nature, 317, 792. ... 

Browning, N. D., Moltaji, H. O., and Buban, J. P. (1998 ). Investigation of three-dimensional grain-boundary structure in oxides through multiplescattering analysis of spatially resolved electron-energy-loss spectra. Phys. Rev. B 58, 8289-300. 

Y. Ishida,ed., Grain Boundary Structures and Related Phenomena, Jpn Inst. 

G. A. Chadwick D. A. Smith, Grain Boundary Structures and Properties,... 

D.A. Smith, C.M.F. Rae, and C.R.M. Grovenor. Grain boundary migration. In R.W. Balluffi, editor, Grain Boundary Structure and Kinetics, pages 337-571, Metals Park, OH, 1980. American Society for Metals. 

However, Plateau s laws are not obeyed by the grain boundary structure in the special polycrystal in Fig. 15.15. To achieve local equilibrium at all grain junctions, so that Plateau s laws are obeyed, the faces of each grain must be curved [31]. A boundary structure in which all junctions obey Plateau s laws is presented in Fig. 15.16, which shows a polycrystal consisting of six grains that meet at four vertices. Each grain fully occupies one face of the polycrystal. As in Fig. 15.15,... 

Solid A Solid B S/S Corrosion, grain boundary passivation, adhesion, delamination, epitaxial growth, nucleation and growth abrasion, wear, friction, diffusion, boundary structure thin films, solid state devices, mechanical stability, creep. 

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