Kepler discovered a number of closely orbiting gas giants, known as hot Jupiters; studies of two such systems showed periodic variations of the chromospheric activity of the primary synchronised to the period of the companion.
32.
Over the past few million years the glacial-interglacial cycle has been " paced " by periodic variations in the Earth's orbit via Milankovitch cycles which are thus the " cause " of ice ages.
33.
"' Surgeless blowers "' These high-pressure, low-volume blowers have a reduced tendency for surging ( periodic variation of flow rate ) even at severely reduced fan speeds.
34.
The ancient Greek astronomers, Hipparchus and Ptolemy, had noted several periodic variations in the Moon's orbit, This accounts for the roughly 18-year periodicity of eclipses, the so-called Saros cycle.
35.
While his first models of production were static, in 1925 he published a dynamic " moving equilibrium " model designed to explain business cycles this periodic variation from overcorrection in supply and demand curves is now known as the cobweb model.
36.
Periodic variations of thrust, caused by combustion instability or longitudinal vibrations of structures between the tanks and the engines which modulate the propellant flow, are known as " pogo oscillations " or " pogo ", named after the pogo stick.
37.
It can be considered as arising from an approximately six-monthly periodic variation of the eccentricity of the Moon's orbit and a libration of similar period in the position of the Moon's perigee, caused by the action of the Sun.
38.
Of this diverse class of stars, some Orion variables may exhibit a small amplitude ( up to 1 magnitude ) periodic variation, some are characterized by abrupt fadings, and some show spectral characteristics indicating mass downfall upon the star ( YY Orionis stars ).
39.
Measurements of periodic variation in surface activity suggest a leisurely rotation period of roughly 116 days . The effective temperature of the star's outer envelope is a relatively cool 3, 150 K, giving the star the characteristic red-orange hue of an M-type star.
40.
A third probe laser is incident at a wavelength at which the ( complex ) index of refraction " n " is different in the bright and dark regions of the interference pattern, so that the periodic variation in " n " serves as a diffraction grating for the probe beam.
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