Sound amplification by stimulated emission of radiation mechanism and an active medium. The pumping procedure can be induced for example by an alternating electric field or with some mechanical vibrations of resonators, followed by acoustic amplification in the active medium. The fact that a SASER operates on principles remarkably similar to a laser, can lead to an easier way of understanding the relevant operation circumstances. Instead of a feedback-built potent wave of electromagnetic radiation, a SASER delivers a potent sound wave. Some methods for sound amplification of GHz-THz have been proposed so far. Some have been explored only theoretically and others have been explored in non-coherent experiments.
A Changed Man and Other Tales A Changed Man and Other Tales A Changed Man and Other Tales is a collection of twelve tales written by Thomas Hardy. The collection was originally published in book form in 1913, although all of the tales had been previously published in newspapers or magazines from 1881 to 1900. There are eleven short stories and a novella "The Romantic Adventures of a Milkmaid". At the end of the book there is a map of the imaginary Wessex of Hardy's novels and poems. Six of the stories were published before 1891 and therefore lacked international copyright protection when the collection began