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.
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.
A scientist is a person engaging in a systematic activity to acquire knowledge. In a more restricted sense, a scientist may refer to an individual who uses the scientific method. The person may be an expert in one or more areas of science. This article focuses on the more restricted use of the word. Scientists perform research toward a more comprehensive understanding of nature, including physical, mathematical and social realms.
Philosophy is a distinct activity that is not generally considered science. Philosophers aim to provide a comprehensive understanding of intangible aspects of reality and experience that cannot be physically measured.
Scientists are also distinct from engineers, those who design, build, and maintain devices for particular situations; however, no engineer attains that title without significant study of science and the scientific method. When science is done with a goal toward practical utility, it is called applied science. An applied scientist may not be designing something in particular, but rather is conducting research with the aim of developing new technologies and practical methods. When science is done with an inclusion of intangible aspects of reality it is called natural philosophy.
Hopeton Brown (born 18 April 1960), better known as Scientist and sometimes known as Overton Brown, was a protégé of King Tubby (Osbourne Ruddock), one of the originators of dub music.
Brown was introduced to electronics by his father, who worked as a television and radio repair technician. He began building his own amplifiers and would buy transformers from Tubby's Dromilly Road studio, and while there would keep asking Tubby to give him a chance at mixing. He was taken on at Tubby's as an assistant, performing tasks such as winding transformer coils, and began working as a mixer in the mid-1970s, initially creating dubs of reworked Studio Oneriddims for Don Mais' Roots Tradition label, given his chance when Prince Jammy cut short a mixing session for Mais because he was too tired to continue.
His name originated from a joke between Tubby and Bunny Lee. Having noticed Brown's forward thinking ideas and technical aspirations, Tubby remarked "Damn, this little boy must be a scientist."
Based on the longevity of a 2001 global storm, NASAscientists estimate it may be September before the haze has cleared enough for Opportunity to power up and call home, the US space agency said this week. Scientists first observed a smaller-scale dust storm on May 30 ... Because Opportunity runs on solar energy, scientists had to suspend science activities to preserve the rover's batteries. ....
With the help of computer scientist Vibhas Aravamuthan, Suhayda produced models that altered or erased the barrier islands under several storm scenarios ...Oil companies have tried quick fixes to shore up islands that support wells and pipelines, but their preferred solution - rock embankments - has only sped up erosion, said Darin Lee, a coastal resource scientist who manages CPRA's barrier island projects....
Scientists say having more energy available for the brain to use can make people feel more motivated to work hard and give them higher self-confidence, which can in turn improve their mental performance ... A small amount of sugar could boost the amount of energy available ......
The properties of a solid depend on the arrangement of its atoms, which form a periodic crystal structure. At the nanoscale, arrangements that break this periodic structure can drastically alter the behavior of the material, but this is difficult to measure. Recent advances by scientists at the U.S.Department of Energy's (DOE) Argonne National Laboratory are starting to unravel this mystery ... ....
The world economy is clearly moving toward greener energy. The days of coal and dirty energy are coming to an end ... We do not want to be one of the last states in our union to be relying on a dying source of energy. Doing this, and postponing the inevitable, will lead to the eventual rapid game of catch-up due to future federal regulations, leading to ineffective energy producing technology....
BEIJING - Chinesescientists have developed flexible micro-batteries with high energy density and steady performance under extraordinary high-temperature, the Chinese Academy of Sciences (CAS) announced Thursday ... storage due to their lightweight and high energy density....