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".

Exclusive (album)

Exclusive is the second studio album by American recording artist Chris Brown. It was released on November 6, 2007, by his independently-owned record label CBE, along with Jive Records; distributed by Zomba Group. The album was serving as the follow-up to his multi-platinum selling debut album Chris Brown (2005).

The album was critically and commercially successful, debuting at number 4 on the US Billboard 200, selling 295,000 copies in the first week. The album was supported by five singles; including three Billboard Hot 100, which successfully entered in the music markets, entering the top 20 amongst other charts worldwide. The album has earned double platinum by the Recording Industry Association of America (RIAA) in the United States, and the album sales it stands at three million copies in the worldwide. The album ranked number 34 on Rolling Stone's list of the Top 50 Albums of 2007.

On June 3, 2008, Exclusive was re-released, when it has expanded into a double-disc deluxe edition; including a counterparts from the DVD, which was also released, which features the behind the scenes footage and music videos from his tour.

Boy Meets World (season 5)

The fifth season of the television comedy series Boy Meets World aired between October 3, 1997 and May 15, 1998, on ABC in the United States. The season was produced by Michael Jacobs Productions and Touchstone Television with series creator Michael Jacobs as executive producer. It was broadcast as part of the ABC comedy block TGIF on Friday evening, returning to its former 8:30 time slot between Sabrina, the Teenage Witch and You Wish.

Cast

Main

Recurring

Special appearance

Episodes

List of The Suite Life of Zack & Cody episodes

The following is an episode list for the Disney Channel situation comedy, The Suite Life of Zack & Cody, which aired three seasons spanning over three years before ending to make way for the sequel, The Suite Life on Deck.

Series overview

Episode list

Season 1: 2005–06

Season 2: 2006–07

Season 3: 2007–08

References

External links