The phrase "activity decline" is correct and usable in written English.
It can be used to describe a decrease in the level or frequency of a particular activity or behavior.
Example: "The recent survey indicated a significant activity decline among participants during the winter months."
Alternatives: "decrease in activity" or "reduction in activity".
Therefore, deactivation causes activity decline due to loss of active alumina sites, but no significant changes in the strength and separation between acid sites.
The activity decline is due to a decrease in the number of active sites on the surface, which was observed as a larger Pd particle size for aged catalysts than for fresh catalysts.
6 Despite this, data from several countries suggest that the majority of children are insufficiently active to confer health benefit 7 8; and that levels of physical activity decline substantially throughout childhood and into adolescence.
The theory, elaborated by Jastreboff, is that when more sounds are fed to the brain sensitivity and spontaneous activity decline — the effect Hippocrates remarked upon.
Few interventions have been successful in reducing the physical activity decline typically observed among adolescents.
The eurozone's three biggest economies saw manufacturing activity decline in November.
During earlier years, despite the particular basic elements of active learning, student activity declined considerably during the course.
Manufacturing activity declined in July, a trade group reported Monday.
The National Association of Purchasing Management reported today that manufacturing activity declined in September for the 14th consecutive month.
The New York-based Conference Board said its monthly forecast of future economic activity declined 0.5percentt in August.
US service providers said overall business activity declined slightly in February, ending a 27-month period of sustained growth.
