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When in this state an asymmetric perturbation of the medium leads to formation of a travelling localized excitation (wave-fragment) which moves along a predetermined trajectory, ideally preserving its shape and velocity over an extended time period.
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The images showed that the flame always preserved its shape while growing in size (even when it had been initiated with a highly convoluted shape); image processing demonstrated the manner with which the flame-growth speed varied as the flame propagated and approached the pentroof and piston-crown walls for slow, "typical" or fast burning cycles.
Transformation of an object which preserves its shape and location is what we call a symmetry.
As noted by Glasner (2015) and Freudenthal (1987), this notion of a body that does not preserve its shape offered several important advantages.
A soliton structure which preserves its shape after collision can trap the plasma particles and transfer them over the large distances.
First, the space between the spheres, which is subject to continuous change, is filled by the body that does not preserve its shape, and so transmission can be explained by contact.
Interestingly, the LBL-assembled FGO-coated PVA sheet remained inert and preserved its shape with little shrinkage even after repeated exposed to high-temperature flame for 9 s, as shown in Fig. 8c.
As long as each subtype in a heterogeneous HSC or progenitor-cell population does not convert into another subtype, the overall aggregated clone size distribution 〈 m k 〉 will preserve its shape.
Daughter cells are continually cut off sequentially from the three inner faces, the apical cell preserving its tetrahedral shape.
Less elasticity of the added transition metal will help in preserving its own shape and size up to some extent during ball-milling and hence transition metal particles will disperse homogeneously on the surface of the alloy particles.
However, it does not preserve its original shape, has low mechanical properties and it suffers from batch-to-batch variations (Antoine et al. 2014).
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