A voltage variable capacitor (VVC) is made by placing an intercalation compound between two electrodes of a capacitor. The VVC has a reservoir of an intercalant in proximity with the intercalation compound. The two materials are chosen from those known to exhibit the intercalation reaction. The extent of the intercalation reaction is controlled by applying a voltage to the intercalant reservoir and the intercalation compound. A variable capacitor is created by applying a signal to the device and appropriately controlling the ε of the device by using the input control voltages.

Megan Isabel Sarson has written:

'Investigations of spin glass type metal antimonates and intercalation into layered type inorganic chalcogenides'

Yes! It was a century leap year. Other century leap years are 1600 and 2000. The next one will probably be 2400, and along with another century leap year, 2800, that is true. The next century leap year will occur in 2400. Century leap years always start on a Saturday and the February 29 intercalation in these days is always a Tuesday to being that year.

Basically, under the Persian Empire, Kidinnu or Cidenas: famous Babylonian astronomer (fourth century BCE?), one of the most important persons in the history of science, created the saros cycle.

At first, intercalary months were announced by the king (who had an astronomical adviser), but after Babylon had been captured by the Persian king Cyrus in 539, priestly officials took over. They started to look for a standard procedure for the intercalation of months. It was introduced in 503 BCE by Darius I the Great (if not earlier).

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