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".

Louise

Louise or Luise may refer to:

People with the given name Louise or Luise

Arts

Louise (opera)

Louise is an opera (roman musical) in four acts by Gustave Charpentier to an original French libretto by the composer, with some contributions by Saint-Pol-Roux, a symbolist poet and inspiration of the surrealists.

The opera depicts Parisian working-class life. However the city itself is in many ways the true star of this very atmospheric work – invoked at various points during the opera. A French example of verismo opera, it tells the story of the love between Louise, a seamstress living with her parents in Paris, and Julien, a young artist. It is the story of a young girl's desire for freedom (associated in her mind with her lover and the city of Paris).

Charpentier later wrote a sequel to Louise, the opera Julien, which describes the artistic aspirations of Louise’s suitor.

Performance history

Louise premiered on 2 February 1900 at the Opéra-Comique conducted by André Messager in a production by Albert Carré. It was successful, reaching its 100th performance just over a year later; the 500th performance at the Opéra-Comique took place on 17 January 1921, and by the early 1950s it had reached over 950 performances. The opera helped launch the career of the soprano Mary Garden, who sang Louise in Act 3 at the eighth performance. On 30 April 1900 the Opéra-Comique director Albert Carré gave away 400 seats to Paris dressmakers.

Louise (Bonnie Tyler song)

"Louise" is a song recorded by Welsh singer Bonnie Tyler for her fifteenth studio album, Wings (2005). It was written by Tyler and Paul D. Fitzgerald, and produced by Jean Lacene (under the alias "John Stage"). The song was released as the lead single from Wings, first as a promotional single in 2005, and as an official single on 19 June 2006 by Stick Music. The lyrics depict Tyler pleading with another woman not to steal her lover.

The song was not a commercial success, but was the first single Tyler had self-written. She also recorded the song in French. A music video was recorded in Tunisia and released on the 2006 CD single.

Composition

"Louise" was written by Bonnie Tyler and French songwriter Paul D. Fitzgerald. Footage of Tyler composing the song with him was shot for a UK television program entitled "On Show", which included promotion for Tyler's latest album. When Tyler first heard the draft put together by Fitzgerald, she was impressed. "It's a really gorgeous song, it's really ballsy as well," Tyler remarked.