Tula

Tula may refer to:

Geography

Antarctica

Iran

Italy

Kenya

Mexico

Mongolia

Russia

United States

People

Tula, Russia

Tula (Russian: Тула; IPA: [ˈtulə]) is an industrial city and the administrative center of Tula Oblast, Russia, located 193 kilometers (120 mi) south of Moscow, on the Upa River. Population: 501,169 (2010 Census); 481,216 (2002 Census); 539,980 (1989 Census).

Etymology

The name of the city is of pre-Russian, probably Baltic, origin.

History

Tula was first mentioned in the Nikon Chronicle in relation to a military operation conducted in 1146. As the chronicle was written in the 16th century, the date is disputed. The first confirmed mention of Tula dates to 1382.

In the Middle Ages, Tula was a minor fortress at the border of the Principality of Ryazan. As soon as it passed to the Grand Duchy of Moscow, a brick citadel, or kremlin, was constructed in 1514–1521. It was a key fortress of the Great Abatis Belt and successfully resisted a siege by the Tatars in 1552. In 1607, Ivan Bolotnikov and his supporters seized the citadel and withstood a four-months siege by the Tsar's army. In the 18th century, some parts of the kremlin walls were demolished. Despite its archaic appearance, the five-domed Assumption Cathedral in the kremlin was built as late as 1764.

Tula, Sardinia

Tula (Sardinian: Tùla) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 170 kilometres (110 mi) north of Cagliari and about 35 kilometres (22 mi) east of Sassari. As of 31 December 2004, it had a population of 1,664 and an area of 65.6 square kilometres (25.3 sq mi).

Tula borders the following municipalities: Erula, Oschiri, Ozieri, Tempio Pausania.

Demographic evolution

References

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.

Seven Year Itch (Collective Soul album)

On September 18, 2001, Collective Soul released their greatest hits compilation Seven Year Itch: Greatest Hits, 1994-2001 (stylized as 7even Year Itch). The compilation includes songs recorded from 1994 to 2001 and included two new tracks; "Next Homecoming" and "Energy". Seven Year Itch received decent reviews and was relatively successful It sold 225,000 copies in the first year after its release and reached number fifty on the Billboard 200; in Canada, it reached number nine on its albums chart and went platinum. All the songs in Seven Year Itch had charted in the US on the Billboard Hot 100, Mainstream Rock Tracks, or the Modern Rock Tracks chart, except for "Energy", which debuted in this compilation.

The compilation has sold over 500,000 copies. It saw a resurgence in sales after Collective Soul began putting out albums on their own independent label, El Music Group, beginning in 2004.

Seven Year Itch was the last album Collective Soul released through Atlantic Records and their last album to feature guitarist Ross Childress, who had been with the band since its 1993/1994 debut.