Energy (signal processing)

In signal processing, the energy of a continuous-time signal x(t) is defined as

the energy of a discrete-time signal x(t) is defined as

Relationship to energy in physics

Energy in this context is not, strictly speaking, the same as the conventional notion of energy in physics and the other sciences. The two concepts are, however, closely related, and it is possible to convert from one to the other:

For example, if x(t) represents the potential (in volts) of an electrical signal propagating across a transmission line, then Z would represent the characteristic impedance (in ohms) of the transmission line. The units of measure for the signal energy would appear as volt²·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing by Z, however, the dimensions of E would become volt²·seconds per ohm, which is equivalent to joules, the SI unit for energy as defined in the physical sciences.

Spectral energy density

Energy (Drake song)

"Energy" is the second single by Canadian rapper Drake from his fourth commercial release If You're Reading This It's Too Late.

Composition

"Energy" contains samples from Eazy-Duz-It performed by Eazy-E and Ridin Spiners performed by Three 6 Mafia. Energy was produced by Boi-1da and OB O'Brien. According to WhoSampled the song samples the score of an episode of The O.C..

Critical reception

"Energy" received acclaim from music critics with many calling it the best song of the album. Ryan Dombal of Pitchfork gave the song a positive review and named it "Best New Track", stating "The song isn't aimed to any rappers or pop stars, not Kendrick Lamar, Big Sean or Tyga, but the song lines are dangerous."

Music video

Release

The video of "Energy" was released on Apple Music and users with iTunes and registered Apple Music account can watch this video.

Synopsis

Energy (Melissa Manchester song)

"Energy" is a song performed by American singer Melissa Manchester, from her 1985 album Mathematics.

Details

The song was arranged by veteran songwriter Greg Mathieson and was released as the second single from the album, following the underperformance of the lead single "Mathematics", MCA hoped to reverse the album's fortune by releasing this Hi-NRG track with an aim for the club market.

Melissa Manchester filmed a videoclip to promote the song, which sees the singer and her band in a sort of industrial-setting stage performing the song.

The single was released on 7" and 12" formats featuring remixes, but it failed to chart either on the Billboard Hot 100 or the dance charts, and failed to chart elsewhere. The b-side to the single was a non-album song, called "So Full Of Yourself", which was co-written by Manchester and Tom Snow and used as the b-side to all 3 singles off the album.

Track listings

Salem station (Oregon)

Salem is an Amtrak train station in Salem, Oregon, United States. It is served by the Amtrak Cascades and the Coast Starlight passenger trains.

History

This station was constructed for the Southern Pacific Railroad in 1918 and is the third station to be built at this location. The two previous stations were built in 1871 and 1889. The 1871 depot burned down in 1885. The Queen Anne-style 1889 depot burned down on March 5, 1917.

The current Beaux-Arts-style structure was constructed of masonry and is one of five masonry depots that still exist along the original Southern Pacific West Coast line. The other depots are in Albany, Medford, Roseburg and Eugene.

A restoration project by the Oregon Department of Transportation (ODOT) was completed in 2000. Amtrak leases the station from ODOT for $1 a year, in exchange for maintenance of the building and grounds.

An 1889 Railway Express Agency (REA) freight depot/baggage shed survived the fire that destroyed the previous station and is the oldest freight depot still in existence in the state. After the 1917 fire, the Queen Anne-style REA depot was relocated from its original site to south of the passenger station. The REA depot has not been used since the mid-1970s, and now awaits restoration.

Salem (MBTA station)

Salem is a passenger rail station on MBTA Commuter Rail's Newburyport/Rockport Line located at 252 Bridge Street near the intersection of Massachusetts Route 107 and Route 114 in Salem, Massachusetts. Salem station consists of one platform which serves a single track. A staircase provides access to the platform from Route 107. Immediately south of Salem, the train tracks enter the Salem Tunnel, which carries trains underneath Washington Street in Salem. A $44.5 million garage with 715 spaces, along with a full-length high-level platform for speedier boarding, opened on October 24, 2014.

During an April 2013 passenger count, Salem averaged 2,122 inbound weekday boardings, making it the second-busiest station (after Providence) on the system except for the three downtown Boston terminals.

History

The Salem station was originally in what is now Riley Plaza, just south of the downtown businesses along Washington Street. The first structure, built in 1838, was a wooden structure with a train shed. It was replaced in 1847 with a medieval-style structure with two towers and a large granite archway through which trains would pass. Despite damage remaining from an 1882 fire, it had become a local landmark by the time it was demolished in 1954.

Salem, Schleswig-Holstein

Salem is a municipality in the district of Lauenburg, in Schleswig-Holstein, Germany.

References