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".
Ivan Ergić
Ivan Ergić (Serbian Cyrillic: Иван Ергић) is a Serbianfootballer who plays as a midfielder.
Born in Croatia and raised in Australia, he began his career at Perth Glory and was briefly with Juventus before moving to Switzerland's FC Basel in 2001, where he played 202 league matches. He left in 2009 for Bursaspor, where he spent two seasons, winning the Turkish Süper Lig in the first.
Ergić was a member of Serbia & Montenegro's squad at the 2006 FIFA World Cup, and earned 11 international caps between 2006 and 2008.
Club career
Perth Glory
Ergić was born in the Croatian coastal town of Šibenik, and lived in the village of Gaćelezi. However, he moved to Perth, Western Australia at an early age and trained at the Australian Institute of Sport on a government-funded football scholarship. He started his football career with Perth Glory in 1999 and helped the club finish runners-up during the 1999–2000 season.
Basel
In 2000, Ergić moved to Italian giants Juventus, but went on loan to FC Basel of Switzerland during the season. He later signed for FCB for CHF1.6 million. He was given the captaincy when Pascal Zuberbühler left in 2006, but in 2008 he resigned from being captain and handed it over to his teammate, Franco Costanzo. He played his 150th first-team game for Basel on 10 May 2008 against BSC Young Boys at St. Jakob-Park. Basel won the game 2–0, which resulted in them becoming Champions. On 16 June 2009, he was released by FC Basel after newly hired manager Thorsten Fink decided not to offer him a new contract. He spent nine years at the club and played over 200 matches.
Podcasts:
