In one test, a cloaked
miniature boat sat motionless in the water even when waves continuously hit it.
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A true cloak allows the clear observation of the space behind the cloaked
region, and the cloaked
region casts no shadow and produces no wavefront changes in the light that has passed through the cloaked
Results show a great reduction of the scattering cross section of the cloaked
device for Mach number up to 0.2.
Good job I landed on this pillow.'' "I beg your pardon?" "Sorry, madam." Cloaked
night clubbers could really take a chance on love by dancing the night away and sharing a goodnight kiss with an anonymous partner.
Dr Xiang Zhang, of the US Department of Energy, said: "It's the first time a 3D object of arbitrary shape has been cloaked
from visible light."
They redirect incoming light waves, shifting them away from the object being cloaked
With this design, any observer will just see a flat ground plane and the scatterer will be invisible and thus effectively cloaked
. We have also shown that despite being designed for 45 degrees, accepting a phase advance/delay of 3% of the period, results in an angular bandwidth of [+ or -]6 degrees.
Again, if you make the lenses big enough, the cloaked
region would be big enough to hide most things - but on a smaller scale, there are not many doughnut-shaped objects that might benefit from invisibility.
But an obstacle arose: To achieve invisibility, light taking a detour around a cloaked
object must catch up to light traveling in a straight line.
It blurs the user's accurate location and replaces it with a well-shaped cloaked
region (usually a circle or a rectangle), according to some anonymity metric such as k-anonymity (the cloaked
region must contain at least k users) or granularity (the size of the cloaked
region must exceed a threshold).
Later on, some researchers [10-12] proposed schemes that a region is generated at first query to be the cloaked
region in the whole life cycle of continuous queries.