Underground

Underground most commonly refers to:

Underground may also refer to:

Places

Arts and entertainment

Film

Underground (1941 film)

Underground is a 1941 war film about the German Nazi Resistance opposing the Nazis in World War II. Jeffrey Lynn and Philip Dorn play two brothers initially on opposite sides.

Cast

External links

Underground (The Electric Prunes album)

Underground is the second studio album by the American garage rock band, The Electric Prunes, and was released in 1967 on Reprise Records. It would be the final album of any materialized input by band members until the 1969 "New Improved" Electric Prunes were formed. The album was a moderate chart hit, but, without a hit-ready single, the band could not repeat their past success.

Background

The album, Underground, brought changes to the band once recording began. Limited lyrical input plagued the band's creative process on their debut. Only one track, composed by Mark Tulin and James Lowe, called "Lovin'" was included on their first album. This changed with this album because Dave Hassinger, the group's producer, was not as active in the sessions resulting in nine of the 12 tracks becoming the band's own material. With so much more musical freedom, the band could mold their music into their own image. The final products were a more direct and cohesive set of songs that reflected the band's own design.

Ultrasonic motor

An ultrasonic motor is a type of electric motor powered by the ultrasonic vibration of a component, the stator, placed against another component, the rotor or slider depending on the scheme of operation (rotation or linear translation). Ultrasonic motors differ from piezoelectric actuators in several ways, though both typically use some form of piezoelectric material, most often lead zirconate titanate and occasionally lithium niobate or other single-crystal materials. The most obvious difference is the use of resonance to amplify the vibration of the stator in contact with the rotor in ultrasonic motors. Ultrasonic motors also offer arbitrarily large rotation or sliding distances, while piezoelectric actuators are limited by the static strain that may be induced in the piezoelectric element.

One common application of ultrasonic motors is in camera lenses where they are used to move lens elements as part of the auto-focus system. Ultrasonic motors replace the noisier and often slower micro-motor in this application.