We can see the biological meaning of the storage effect expressed in the mathematical form of ?I . The first term of the expression is covariance between environment and competition ( Cov ( " E " " C " ) ), scaled by a factor representing buffered population growth ( " ? " ).
42.
Evident from these characterizations is that while under the photoelectric effect bound electrons released from such photosensitive materials vary linearly with the frequency of the radiation, " that is for each incident photon an electron is ejected ", under the storage effect a photoconductive and photovoltaic phenomenon occurs where ( " apart from the liberation of electrons from metals " ) when photons are absorbed in a p-n junction ( in a semiconductor ) or metal-semiconductor junction, " new free charge carriers are produced ", ( photoconductive effect ) and where " the electric field in the junction region causes the new charge carriers to move, creating a flow of current in an external circuit without the need for a battery ", ( photovoltaic effect ) ( " The International Dictionary of Physics and Electronics ", N . Y . 1956, 1961, pp . 126, 183, 859-861, 863, 1028-1028, 1094-1095 ).
