Kristína (singer)
Kristína Peláková (born 20 August 1987), professionally known as Kristína, is a Slovak singer. Kristína started her career as a child singer, dancer and piano player in Svidník, Slovakia. Following the advice of her music teacher, she took singing as her major and attended the Conservatoire (Music School) in Košice. While studying, her favourite place in the town was the Jazz Club where she met Martin Kavulič. He became her producer and helped her to secure a contract with the record label H.o.M.E. Production. Her first single was "Som tvoja" (I Belong To You), featuring the rapper Opak, released in 2007. The first track, named "Vráť mi tie hviezdy" (Give The Stars Back To Me), became a hit in Slovakia in 2008. Her début album ....ešte váham (...Still Hesitating) was also released in this year. Kristína won the national selection to represent Slovakia in the Eurovision Song Contest 2010 with the song "Horehronie". She got the largest share of television votes and came second in the jury vote. Horehronie is a rural region in Slovakia. The lyrics tells the story of a heartbroken girl who finds solace in the nature, its woods and "black hills to make her grief disappear." The song was composed by Martin Kavulič. The song peaked at No.1 on the Slovak airplay chart and she became a very popular hit in Slovakia and for the eurovision fan. Kristína failed to qualify to the Eurovision Song Contest 2010 Final from Semifinal 1 on 25 May.
Energy (journal)
Energy is a peer-reviewed academic journal covering research on energy engineering that was established in 1976. It is published by Elsevier and the editor-in-chief is Henrik Lund (Aalborg University). According to the Journal Citation Reports, the journal has a 2013 impact factor of 4.159, ranking it 13th out of 83 journals in the category "Energy & Fuels" and second out of 55 journals in "Thermodynamics".
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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 (Keri Hilson song)
"Energy" is the debut single by American recording artist Keri Hilson. The song was written and produced by The Runaways, consisting of Louis Biancaniello, Sam Watters, Rico Love, and Wayne Wilkins, for her studio album In a Perfect World… (2009).
The track was released as the first single from the singer's debut in the United States on May 27, 2008. Although being released worldwide it initially only charted in New Zealand at number two and only managed to reach top thirty on the U.S. Billboard Hot R&B/Hip-Hop Songs and Hot Dance Club Play charts.
Generally well received by music critics, it was named sixty-first on The Top 144 Songs of 2008 listing by Blender magazine.
Background
"Energy" was written and produced by The Runaways. It was also recorded by The Runaways at Homesite 13 studios in Novato, California. and Hilson stated that she wanted to prove that she can be successful even without collaborations and guest vocalists and so it was announced "Energy" would be released as the next worldwide single following the success of "Knock You Down". The song was released on September 14, 2009 in the UK. On September 25, 2009 she appeared live on breakfast TV show GMTV in the UK where she performed the single. That same day, she appeared on BBC Radio 1's Live Lounge where she performed a stripped version of "Energy" as well as a gospel cover version of "Supernova" originally sung by Mr Hudson and Kanye West.
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