"phases of activity" is correct and usable in written English.
For example, "The project involved five distinct phases of activity spread over a two-month period."
First, USOs go through a number of distinct phases of activity in their development.
His own work combined freedom and discipline, and his successive phases of activity, in printing, publishing, architecture and fine art, helped to expand the range of applications for characterful letterforms.
This, it said, 'is not a question of the right of the Federal government to control all phases of activity on navigable streams, nor a question of its power, under the Federal power act, to delegate that right.
Into a life cut short by a heart attack at the age of 63, Elaine Paintin packed three quite different phases of activity, as arts administrator, civil servant at the Department of National Heritage, and director of the Marc Fitch Fund.
In all, four phases of activity can be identified; in each there were a critical number of researchers who interacted with each other, driving forward advances in various forms of recording methods.
Phases of activity (i.e. periods in which the number of structures increased), as well as the 'lulls' that separate them, show no consistent correlation with periods of wetter or drier conditions on the bogs, suggesting that the impetus for the start or cessation of such activity was not climatically-determined.
The first version of the SQDL strategy that satisfies these requirements is comprised of the following three phases of activities: Fig. 1 a SQDL version 1 the preliminary version.
Taken together these data thus demonstrate two distinct phases of activity-dependence: an acceleration of endocytosis for stimuli >1 AP and a slowing for stimuli > approximately 10 AP.
This phase of activity is especially important for two reasons.
Mr Bush's new phase of activity comes amid growing concerns of an international wobble exactly one month after the beginning of the US bombing campaign.
Their phase of activity differed from their sisters caged outside the hive in only one of the two trials (with colony 13 13).
