The phrase "activity has remained" is correct and usable in written English.
It can be used to indicate that a certain activity has continued to exist or persist over a period of time without significant change.
Example: "Despite the challenges, the activity has remained consistent throughout the year."
Alternatives: "activity has persisted" or "activity has continued".
Most of the induced activity has remained active until the present (Mar. 31, 2011).
While U.S./U.K. M&A activity has remained significant in the last 12-months, it remains to be seen whether this trend continues in light of ongoing uncertainty surrounding Brexit.
The BH3-only protein Bim is a potent direct activator of the proapoptotic effector protein Bax, but the structural basis for its activity has remained poorly defined.
Activity has remained subdued this year.
Even with higher interest rates, activity has remained healthy.
Housing activity has remained vigorous throughout the economic slump that started a year ago.
The CML said activity had "remained robust" despite the changes, but warned the market still faced "headwinds".
Indeed, engagement activists, typically institutions or individuals that push for governance changes, targeted 155 companies worldwide in 2016 up 24% after three years in which activity had remained flat.
Given the complexity of CRL complexes, steps toward the structure-based design of small-molecule inhibitors to modulate their activity have remained elusive.
If pass-through activity had remained at 1980's low level, strong but straightforward assumptions imply that the 2011 average U.S. tax rate on total U.S. business income would have been 28% rather than 24%, and tax revenue would have been approximately $100 billion higher.
However the details of the chemical mechanisms controlling selectivity and activity have remained elusive because important sites in these structures are occupied by mixtures of Mo and V atoms, obscuring the actual distributions of the metals and oxides at the active sites.
