Tau (particle)

The tau (τ), also called the tau lepton, tau particle, or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of ¹⁄₂. Together with the electron, the muon, and the three neutrinos, it is a lepton. Like all elementary particles with half-integral spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin, which in the tau's case is the antitau (also called the positive tau). Tau particles are denoted by τ− and the antitau by τ+.

Tau leptons have a lifetime of 6987290000000000000♠2.9×10⁻¹³ s and a mass of 7003177682000000000♠1776.82 MeV/c² (compared to 7002105700000000000♠105.7 MeV/c² for muons and 6999511000000000000♠0.511 MeV/c² for electrons). Since their interactions are very similar to those of the electron, a tau can be thought of as a much heavier version of the electron. Because of their greater mass, tau particles do not emit as much bremsstrahlung radiation as electrons; consequently they are potentially highly penetrating, much more so than electrons. However, because of their short lifetime, the range of the tau is mainly set by their decay length, which is too small for bremsstrahlung to be noticeable: their penetrating power appears only at ultra high energy (above PeV energies).

Tau (mythology)

Tau is the name of an evil spirit in Guaraní mythology. Although Tau is not quite synonymous with the Devil in Christian beliefs, for example, he was sometimes referred to as The Evil Spirit and as such may have been a personification of evil itself. Tau was created along with his opposite, Angatupyry, by the supreme god of the Guaraní creation myth, Tupã, and was left with humanity on Earth.

Consort and children

Tau found himself enamored by a woman named Kerana, the daughter of Marangatu, who lived among the Guaraní tribe. Tau disguised himself as a handsome young man and wooed her for seven days before deciding to kidnap her, but his plot was foiled by Angatupyry, the spirit of goodness. Tau and Angatupyry fought each other for seven days and seven nights in a fairly stereotypical "Good vs Evil" fight until he was at last defeated. Following his defeat, he was exiled from the land by Pytajovái, the god of war and valour.

Tau would not be so easily defeated. In spite of his expulsion he was able to return and kidnap the beautiful Kerana. It is generally assumed that he raped her while keeping her in captivity, although the tale is often told differently because the Guaraní did not have a written language, and some accounts tell of Tau and Kerana being married. Whichever the case, the product of Tau and Kerana's intercourse was seven children who were cursed by the goddess Arasy and born as monsters. Each of the seven were revered or feared, each possessing different abilities and traits, central to Guaraní lore.

Turn (geometry)

A turn is a unit of plane angle measurement equal to 2π radians, 360° or 400 gon. A turn is also referred to as a revolution or complete rotation or full circle or cycle or rev or rot.

A turn can be subdivided in many different ways: into half turns, quarter turns, centiturns, milliturns, binary angles, points etc.

Subdivision of turns

A turn can be divided in 100 centiturns or 1000 milliturns, with each milliturn corresponding to an angle of 0.36°, which can also be written as 21′ 36″. A protractor divided in centiturns is normally called a percentage protractor.

Binary fractions of a turn are also used. Sailors have traditionally divided a turn into 32 compass points. The binary degree, also known as the binary radian (or brad), is ¹⁄₂₅₆ turn. The binary degree is used in computing so that an angle can be represented to the maximum possible precision in a single byte. Other measures of angle used in computing may be based on dividing one whole turn into 2ⁿ equal parts for other values of n.

Low (Flo Rida song)

"Low" is the debut single by American rapper Flo Rida, featured on his debut studio album Mail on Sunday and also featured on the soundtrack to the 2008 film Step Up 2: The Streets. The song features fellow American rapper T-Pain and was co-written with T-Pain. There is also a remix in which the hook is sung by Flo Rida rather than T-Pain. An official remix was made which features Pitbull and T-Pain. With its catchy, up-tempo and club-oriented Southern hip hop rhythms, the song peaked at the summit of the U.S. Billboard Hot 100.

The song was a massive success worldwide and was the longest running number-one single of 2008 in the United States. With over 6 million digital downloads, it has been certified 7× Platinum by the RIAA, and was the most downloaded single of the 2000s decade, measured by paid digital downloads. The song was named 3rd on the Billboard Hot 100 Songs of the Decade. "Low" spent ten consecutive weeks on top of the Billboard Hot 100, the longest-running number-one single of 2008.

Radio (Darius Rucker song)

"Radio" is a song co-written and recorded by American country music artist Darius Rucker. It was released on July 22, 2013 as the third single from his album True Believers. Rucker wrote the song with Luke Laird and Ashley Gorley.

Content

The song is a reflection on the narrator's teenage years: specifically, of borrowing his mother's car to take his girlfriend for a ride, and listening to songs on the radio while doing so.

Critical reception

The song generally received favorable reviews. Bobby Peacock of Roughstock gave the song four and a half stars out of five, saying that "it sounds like the kind of fun song you would want to hear on the radio at a memorable moment." Peacock praised Rucker's "all-smiles delivery" and the song's "incredibly catchy melody and tight production." He also compared its theme to "I Watched It All (On My Radio)" by Lionel Cartwright. Tammy Ragusa of Country Weekly gave the song an A grade, calling it "the perfect marriage of an artist’s effervescent personality with an upbeat song, this one about the love of music." Billy Dukes of Taste of Country gave the song two and a half stars out of five, writing that "the uptempo tribute to young love, open roads and, of course, the radio is familiar and easy to fall for, especially when powered by Rucker’s unequaled exuberance." However, Dukes also called the song "a little fluffy" and "not difficult to forget."

X-Dream

X-Dream are Marcus Christopher Maichel (born May 1968) and Jan Müller (born February 1970); they are also known as Rough and Rush. They are some of the cult hit producers of psychedelic trance music and hail from Hamburg, Germany.

The latest X-Dream album, We Interface, includes vocals from American singer Ariel Electron.

First work

Muller was educated as a sound engineer. Maichel was a musician familiar with techno and reggae, and was already making electronic music in 1986. In 1989 the pair first met when Marcus was having problems with his PC and someone sent Jan to help fix it. That same year they teamed up to work on a session together. Their first work concentrated on a sound similar to techno with some hip hop elements which got some material released on Tunnel Records.

Trance

During the early 1990s they were first introduced to the trance scene in Hamburg and decided to switch their music to this genre. From 1993 they began releasing several singles on the Hamburg label Tunnel Records, as X-Dream and under many aliases, such as The Pollinator. Two albums followed on Tunnel Records, Trip To Trancesylvania and We Created Our Own Happiness, which were much closer to the original formula of psychedelic trance, although featuring the unmistakable "trippy" early X-Dream sound.