The phrase "activity variation" is correct and usable in written English.
It can be used in contexts where you are discussing changes or differences in activities, such as in research, analysis, or project management.
Example: "The study revealed significant activity variation among different demographic groups, indicating diverse engagement levels."
Alternatives: "activity fluctuation" or "variation in activities".
The promoted molybdenum sulfided catalysts showed a wide range of activity variation with support composition, which establishes that molybdenum sulfided active phases strongly depend on the nature and composition of the support.
Sulfided catalysts showed a wide range of activity variation as a function of support composition which established that molybdenum sulfided active phases strongly depend on the nature and composition of support.
It has been found that sulfided catalysts showed a wide range of activity variation with TiO2 incorporation into the alumina, which confirmed that molybdenum sulfided active phases strongly depend on the nature of support.
Manifestation of solar activity variation in the electron temperature (Te) and electron density (Ne) during the solar maxima is studied.
The temporal and solar activity variation of the B-parameters over Dibrugarh are investigated and compared to those predicted by IRI-2012 model with ABT-2009 option.
In the past two decades, the development of density functional theory (DFT) and surface kinetics make it feasible to theoretically evaluate and predict the catalytic activity variation of catalysts within a descriptor-based framework.
The model describing the connection between solar activity variation and cosmic ray convection diffusion global modulation for neutron monitor energies is here developed by taking into account also the time-lag of the small energy particle diffusion in the Heliosphere.
We employed a better description of the solar activity variation based on the assumption that the dependence of the logarithm of absolute densities of the individual ion species (H+, O+, He+ and N+) on the F10.7 index is linear.
In this paper, we investigate properties long-term variations in galactic cosmic ray intensity as an important possible link in the connection between solar activity variation and global climate change.
In this paper, we first analyzed the trough structure for geomagnetic activity variation during equinox and for solar activity variation in different seasons.
The solar activity variation of low-latitude F2 layer density may get modulated by the solar activity variation of the mechanism that creates the WN4 structure.
