Operation Sigma Sigma

The Sigma is an experimental glider developed in Britain from 1966 by a team led by Nicholas Goodhart. After disappointing performance during flight testing the Sigma was passed on to a Canadian group which carried out modifications, making the Sigma more competitive.

Design and development

Designed to compete in the 1970 World Championships, the team aimed to develop a wing that would climb well through a high lift coefficient and a large wing area, but equally had the "maximum possible reduction of area for cruise at low lift coefficients". At the same time for the minimum possible drag they aimed for "extensive" laminar flow. To achieve this they employed flaps that would alter both wing area and wing camber. Based on analysis of the nature of thermals encountered in cross-country flying, they reasoned that by having a slow turning circle, their sailplane could stay close to the central (and strongest) part of the thermal and gain maximum benefit.

Its unusual feature is its ability to vary its wing area using Fowler flaps. It had been tried before by the Hannover Akaflieg in 1938 with their AFH-4, the South African Beatty-Johl BJ-2 Assegai and the SZD Zefir gliders.

Sigma (cosmology)

Sigma in cosmology was a property of galaxies used when trying to work out the mystery of galaxies and their supermassive black holes.

History

In the late 1990s the NUKER experts had made observations with a spectroscope of two galaxies, one of an active galaxy with an active galactic nucleus called NGC10-68 and a dormant galaxy next door to us named Andromeda.

The observations are shown. The light from the centre in Andromeda galaxy was distorted proving the existence of super-massive black holes.

Other observations proved most galaxies had a similar centre whether it be active or dormant.

They then realised that the black holes must have something to do with a galaxy's formation, so they turned to something they thought was useless: the speed of the stars around the edge of the galaxy. This was Sigma, the speed of the stars at the edge of the galaxy supposedly unaffected by the mass of the black hole at the centre.

Usage In Cosmology

The NUKER team calculated the sigma of several stars in different galaxies and the mass of the black hole at the (nucleus) centre. They expected no correlation what so ever. But when plotting their results on a Scatter diagram and drawing a line of best fit they ended up with a positive correlation. It appeared that the heavier the black hole at the centre was the faster the stars within the galaxy travelled.

Sigma (duo)

Sigma is an English drum and bass duo consisting of Cameron Edwards and Joe Lenzie. They met at Leeds University at drum and bass nights. Their 2010 collaboration with DJ Fresh, "Lassitude", peaked at number 98 on the UK Singles Chart. Their single "Nobody to Love" topped the UK Singles Chart, becoming their first UK number one. Follow-up single "Changing", featuring Paloma Faith, also got to number one.

Career

Formation

Lenzie and Edwards met in 2006 at Leeds University; Cameron was working in local record store Tribe Records and with Echo Location's Obi running local night Event Horizon, while Lenzie was DJing hip-hop and warming up Event Horizon for such acts as Rahzel and Grandmaster Flash. Once they had finished in Leeds, they relocated to London and became a three-piece with Edwards' school friend Ben Mauerhoff, being signed under DJ Fresh's Breakbeat Kaos. After a while, long distances took their toll – Edwards and Mauerhoff were based in Surrey, whereas Lenzie was based in Harpenden, Hertfordshire and they couldn't get three people into the Harpenden studio – and Mauerhoff left. In December 2008 they formed their own record label, Life Recordings (so called because, according to Lenzie, the industry demanded that it be their life). Its inaugural release was a VIP mix of their early Bingo Beats single "El Presidente".

Off!

Off! is an American hardcore punk supergroup, formed in Los Angeles in 2009.

History

Off! was formed in Los Angeles, California in late 2009 by Circle Jerks/Black Flag singer Keith Morris, Burning Brides frontman Dimitri Coats, Redd Kross bassist Steven Shane McDonald, and Rocket From The Crypt/Hot Snakes drummer Mario Rubalcaba. The idea to form the band came after Coats had worked as producer on a Circle Jerks album which fell apart. During that time, Coats and Morris had written several songs together which they used to start Off!. The group made its live debut at the 2010 South By Southwest Music Festival in Austin, Texas. Off!'s first Los Angeles show featured an original art installation by Raymond Pettibon at a downtown warehouse space.

The first release by Off! is a 7" vinyl EP called 1st EP, which debuted on October 13, 2010. That EP, along with three more EPs, were later released as a four 7" vinyl box set entitled First Four EPs on December 14, 2010. The collection contains sixteen songs and features artwork by Raymond Pettibon.

OFF (file format)

OFF is a geometry definition file format containing the description of the composing polygons of the 3D object.

Composition

Example

OFF!

OFF! is an insect repellent brand from S. C. Johnson & Son, produced in Finland. Its active ingredient is DEET (N,N-diethyl-m-toluamide). It was first sold in 1957.

Products

References

External links

As If (album)

As If is the sixth studio album by American dance-punk group !!!, released on October 16, 2015 on Warp Records.

Singles

Three official singles have been released from As If: "All U Writers", a 5 1/2 minute (5 minutes on the album) long song featuring vocals from Teresa Eggers, released 28 April 2015. "Freedom '15", a groovy leviathan of a disco track, released 30 July 2015, and features vocals from Yolanda Harris Dancy and Taletha Manor. A lyric video for "Freedom '15" was uploaded 20 August 2015. The third single from the album, "Bam City", was released 30 September 2015, with an accompanying music video. "Ooo", a grooving love song, was released with an accompanying music video on November 16, 2015.

Promotional singles

One promotional single has been released from the As If: "Sick Ass Moon", an "R&B-tinted house track", released with "Freedom '15" on 30 July 2015.

Critical Reception

In a positive review for Exclaim!, Daniel Sylvester called the album "one of the most enjoyable, if schizophrenic, dance albums of the year."