The phrase "of circa" is correct and commonly used in written English.
It is often used to indicate an approximation or estimate of a time period. Example: The castle was built in the 12th century, or circa 1150.
Pathos is also the beauty of "Circa 1971," though.
Bio-GNPs are successfully produced as spherical shape with size of circa 10.4 nm.
Diblock copolymers of polystyrene (PS) and polyethylene oxide (PEO) with a total molecular weight of circa 7500 g mol−1 and a PS weight fraction of circa 0.15 have been synthesised in all possible variants of hydrogenous and deuterated forms.
In this case source size limited resolving power of circa 40 000 is expected at 100 eV.
The resonant antenna produces an excitation enhancement of circa 100 times and a fluorescence lifetime shortening to ~\n20 ps.
The gilded brass mounts on two suites of circa 1790 Russian neoclassical mahogany dining room chairs further echo the gold.
"I am satisfied that the integrity of the date of circa 1649" was upheld by the test results, he said.
"It goes back to classic French," says Mr. Coury, the head chef and one of seven owners of Circa.
A statistical analysis of circa 20,000 X-ray structures evidenced the effects of temperature of data collection on protein intramolecular distances and degree of compaction.
Average reproducibility values of circa 3% are reported with overall sampling uncertainties ranging from 9% to 15%, for the whole range of tested conditions, depending on the compound.
Linear features of circa 25 μm width and 12 μm height are achieved on amorphous and crystalline titania and graphitic carbon films deposited on silicon.
