The phrase "abrupt boundary" is correct and usable in written English.
It can be used to describe a sudden or sharp distinction or separation between two areas, concepts, or conditions.
Example: "The abrupt boundary between the forest and the desert created a striking contrast in the landscape."
Alternatives: "sharp divide" or "sudden limit".
Changes of sound speed in the horizontal are usually slight except in areas where abrupt boundaries exist between waters of different properties.
In a sedimentary environment, layered models with abrupt boundaries between the different soil units represent the soil profile accurately.
Some changes of land-surface classes coincide with abrupt boundaries in the landscape, such as ridges and thalwegs.
On a sandplain on the edge of the Tanami Desert, grassland and shrubland are juxtaposed with abrupt boundaries that cut across a subtle environmental gradient.
The margin-plate basin-mountain systems, with binary units of large-scale thrust belts and foreland basins, have different deep lithospheric structures, abrupt boundaries and great contrast in today's geomorphology between the basin and the mountains.
If the system of interest includes different dielectric regions (or phases) characterized by different values of the permittivity and separated by abrupt boundaries, Coulomb's law is not enough.
As described above, abrupt boundaries lead to dramatic differences between the behavior of groups near those boundaries and those at the array's center, whereas tapered boundaries reduce these distinctions.
Since the mapping of sense small RNAs to many genes often had abrupt boundaries within/near 3′ end of genes and sometimes extended into intergenic regions (Additional file 1: Figure S7), we felt that some mapping artifacts could be due to poor genome quality in these regions.
Video shot boundaries can be classified into two types: abrupt shot boundary (ASB) (as in Fig. 2) and gradual shot boundary (GSB), according to a certain classification of scene transition, which in general is related to content variation over time.
