The SWCNT@SiO2core/shell heterostructures were obtained after removal of supernatants by three circles of centrifugation and redispersion in absolute ethanol.
After continuous stirring for 3 h at ambient temperature, the resulting SWCNT@SiO2 SH hybrid was collected after purification by three circles of centrifugation and redispersion in absolute ethanol.
Protected and defended by seven circles of walls, constructed of palaces that serve as dwellings for the citizens, the city is located in a place with an ideal climate, conducive to physical health, and on the slope of a hillside because the air there is lighter and purer.
A large LCD screen is positioned in front of them at a distance of about 1 m, displaying the positions of hand and target by means of two circles of different colors, with a diameter of 2 cm, on a background which can be either blank or structured, portraying the shape of the nominal trajectory.
As its name implies "The Dance" (2002) by Jeffrey Maron, three arcs and two circles of a copper alloy, also puts a premium on rhythm.
The problem of bisecting a given angle is counted among planar problems, because, as detailed by Euclid in Elements I.9, to construct the line segment that divides a given angle into two equal parts, we construct (by compass) three circles of equal radius, and then (by straightedge) join the vertex of the angle with the point at which the circles intersect (Euclid 1956, Volume I, 264 265).
Britain's role, up there with the US and USSR, was to be sustained by its three circles of influence: the US special relationship; the UN security council; and the Commonwealth.
A symptom that was mentioned as a symptom for three of the four conditions is enclosed by three circles.
