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Cosmic ray visual phenomena, or light flashes ( LF ), also known as Astronaut's Eye, are spontaneous flashes of light visually perceived by some astronauts outside the magnetosphere of the Earth, such as during the Apollo program. While LF may be the result of actual photons of visible light being sensed by the retina, [1] the LF discussed here ...
Fluorescence intermittency, or blinking, is the phenomenon of random switching between ON (bright) and OFF (dark) states of the emitter under its continuous excitation. It is a common property of the nanoscale emitters (molecular fluorophores, colloidal quantum dots) related to the competition between the radiative and non-radiative relaxation ...
Patients suffering from blepharospasm also report sensory symptoms including sensitivity to light, [14] [15] dry eyes, [16] and burning sensation and grittiness in the eyes. [4] Although such symptoms tend to precede the onset of the blepharospasm, they may both be due to a common third factor.
According to Ohio-based clinical psychologist Sarah Cain Spannagel, PhD, the end of the season can bring feelings of loss: “Letting go of some of the liberty that comes with the summer can be ...
One-way mirror. A one-way mirror, also called two-way mirror[ 1] (or one-way glass, half-silvered mirror, and semi-transparent mirror ), is a reciprocal mirror that appears reflective from one side and transparent from the other. The perception of one-way transmission is achieved when one side of the mirror is brightly lit and the other side is ...
The partial failure of Minnesota’s Rapidan Dam sheds like on the almost 4,100 dams in the U.S. that are categorized at the same risk level and condition – or worse.
Former U.S. women's soccer star Megan Rapinoe and Spanish basketball great Pau Gasol were also among the celebrities sitting courtside for the gold medal game. "We just knew what we had to do ...
An occulting light is a rhythmic light in which the duration of light in each period is longer than the total duration of darkness. In other words, it is the opposite to a flashing light where the total duration of darkness is longer than the duration of light. It has the appearance of flashing off, rather than flashing on.