Like his contemporary Jan van Eyck (c. 1395 144141), when working in portraiture, he used dark planes to focus attention on the sitter.
By using the negative refraction behavior, we can design a sonic crystal plane lens to focus a sonic wave.
In the digital reconstruction step, by varying the depth d in the reconstruction routine, the complex amplitude of the object wave can be reconstructed at different planes, enabling DHM to focus at different depth planes digitally.
As a result, the zero-order and 1st-order spots, originally focused at the objective focal plane, z0, come to focus at a distance z0+Δz.
Pelvic reference planes used today tend to focus on pelvic tilt but do not take into account the very important global morphologic element of the spinopelvic unit, represented by pelvic incidence [ 22- 26].
Lenses discussed so far (perfect lens, superlens and hyperlens) have a limitation in common; incapability to focus a plane wave into a spot.
Whereas a convex shape is used to focus a plane wave for conventional materials, the hyperbolic MIL has concave surface due to negative refraction at the metamaterial-air interface [119].
Because artificial magnetic response is difficult to be fabricated, GRIN metalens in which permittivity distribution is designed in order to focus a plane wave was introduced and achieved a resolution of one-sixth of a wavelength [120].
I won't get deep into the mechanics of it (Wikipedia has an excellent entry) but basically it creates an image where part goes to one eye and part to another, and part to both — this last part will be the screen's "normal plane" where your eyes are to focus, and hence receive similar input.
He said Friday that the proposals seemed intended to mollify the F.A.A. to lift the grounding of the planes, but the approach seemed to focus more on dealing with a battery failure rather than preventing one.
