"active existence" is correct and usable in written English.
It can be used to refer to an active lifestyle or life choices that prioritize physical activity and engagement with the world. For example, "Amy dedicated her life to an active existence, traveling around the world and taking on a variety of different jobs."
Vanity Fair is a society magazine, and Middleton leads the kind of socially active existence that its readers identify with or aspire to.
The Royal Air Force (RAF), the world's first separate air service, was brought into active existence by a series of measures taken between October 1917 and June 1918.
Last summer was spent with mouth sores, frequent emergency trips to the bathroom and a general readjustment of my previous active existence as a writer, college teacher and aficionado of life.
The tamarins' more active existence might make the trip seem less of a chore, says Stevens.
Our data in Tables 1 and 2 clearly reflected pertaining to availability of optimum soil water content for the active existence of soil niche.
This is also true of bacteria, which spend the majority of their active existence as multicellular organisms, not isolated single cells.
This is because τ on and (P_{i,j}^{k}) display the same performances like the active UEs' existences with their on off binary values.
Mr Andreessen reckons that as many as 300 of the 880 or so active funds in existence could disappear.
In active tectonic settings, existence of large conductive zones in the mid-crustal depths, similar to C3, is usually associated with aqueous saline fluids or partial melts (Unsworth 2010).
(b) Constraints were added to minimize the number of active reactions whose existence is not supported by genome annotations.
In the case of cytochrome bc1, early EPR examination of mitochondrial enzyme allowed to approximate a spatial organization of its redox active centers revealing existence of weak spin−spin interactions between the FeS center, heme b566 (bL), and heme c1(40).
