What is coarse-graining in physics?
A coarse-grained description is one in which some of this fine detail has been smoothed over. Coarse-graining is at the core of the second law of thermodynamics, which states that the entropy of the universe is increasing. As entropy, or randomness, increases there is a loss of structure.
What is coarse grained time series?
The coarse-grained time series for a scale factor τ are obtained by calculating the arithmetic mean of τ neighboring values without overlapping. This coarse-graining procedure is similar to moving-averaging and the decimation of the original time series.
How does grain size affect mechanical properties?
Grain size has a measurable effect on most mechanical properties. For example, at room temperature, hardness, yield strength, tensile strength, fatigue strength and impact strength all increase with decreasing grain size.
What does the coarse and fine grain texture of the rocks indicate about the rocks formed and their respective cooling histories?
Phaneritic texture describes coarse grained rocks. They are characteristic of intrusive (plutonic) rocks and have crystals that can be seen with the unaided eye. Indicates slow cooling history. … These larger crystals are called phenocrysts while the finer-grained matrix is referred to as the groundmass.
How does grain size affect strength?
Smaller grains have greater ratios of surface area to volume, which means a greater ratio of grain boundary to dislocations. The more grain boundaries that exist, the higher the strength becomes.
Why rocks is coarse grained?
If magma cools slowly, deep within the crust, the resulting rock is called intrusive or plutonic. The slow cooling process allows crystals to grow large, giving the intrusive igneous rock a coarse-grained or phaneritic texture. The individual crystals in phaneritic texture are readily visible to the unaided eye.
What is coarse grained rock?
(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).