The phrase "a clear variation" is correct and usable in written English.
It can be used when discussing differences or changes that are easily identifiable or distinct from something else.
Example: "The study revealed a clear variation in the results between the two groups."
Alternatives: "an obvious difference" or "a distinct change".
Neutron radiographs acquired during operation show a clear variation in transmission behavior, primarily due to drying.
SWCC results also showed a clear variation in SWCC profiles of soils with respect to soil plasticity.
HRTEM micrograph analysis (Fig. 2) indicates a clear variation of the interbase distance of the A-DNA form due to the interaction with ligands, such as bis-intercalators and CisPt.
For a clear variation cycle, the first Pi2 burst appears 36 ± 8 min after southward turning of the IMF and the second one follows14 ± 4 min after a northward turning.
There is a clear variation in diameter and length of ZnO nanowires in different positions.
Examining Figure6, the differences in fluctuation amplitudes show a clear variation between complete THz-OFF and THz OFF-ON states.
Thus, we found not only a seasonal variation of diagnosis, which is well known 14, but also a clear seasonal variation of C-peptide at diagnosis with lower C-peptide in patients diagnosed in those months (April and May) when the incidence was lowest.
These factors induced numerous depletion regions in ZnO-ZGO when exposed to ambient air in the current study; a clear resistance variation was further achieved in the sample upon exposure to the acetone gas. Figure 6 Time-dependent current variation of the ZnO-ZGO heterostructures upon exposure to various acetone concentrations (50, 100, 250, 500, and 750 ppm) at 325°C.
There is a clear seasonal variation at both stations.
There is a clear seasonal variation in the ratios and there is evidence of a difference between rainfall stations.
(2) HT shows a clear annual variation with largest daytime values occurring in summer and smallest values in winter.
