| 1. | Tidal forces are periodic variations in gravitational attraction exerted by celestial bodies.
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| 2. | Where \ scriptstyle N is the number of periodic variations.
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| 3. | In addition there are periodic variations, as Earth moves within the Solar system.
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| 4. | Terraces record natural, periodic variations driven by cycles such as the Milankovitch cycle.
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| 5. | In this case the periodic variation is a variation in the insertion loss of the network against increasing frequency.
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| 6. | Instead, it is perceived as a periodic variation in the amplitude of the first term in the expression above.
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| 7. | Unusual periodic variations in the pulsation amplitude were also noticed, similar to the Blazhko effect in RR Lyrae variables.
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| 8. | When ultrasonic waves are propagated in a liquid, the density varies from layer to layer due to periodic variation of pressure.
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| 9. | A pumped wave excited in the active medium produces a periodic variation of the volumes of the dispersed particles ( gas bubbles ).
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| 10. | The small periodic variations in the magnitude of Beta Librae suggest the presence of a companion star which is not directly observable from Earth.
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