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".

Tap (gaming)

Tapping is a term used in a variety of ways in a number of games. Although the exact meaning varies, it generally either refers to either the physical action of actually touching something, or to the "using up" of the resources of some element of the game.

Collectible card games

In collectible card games such as Magic: The Gathering to tap a card means to use it so that it cannot be used again in that player's turn. The visual indication of the tapped status is represented by turning the card 90 degrees to the right.

On cards since Revised edition (1994), tapping has been represented by a symbol, though this is not unique to the game of Magic: The Gathering. U.S. Patent 5,662,332 was filed by Wizards of the Coast to patent the mechanics of some aspects of collectible card games, including tapping.

Mechanics similar to tapping are used in many collectible card games, often involving the same 90 degree card rotation. For example, this act is referred to as setting in Ophidian 2350, while it is known as committing in the Universal Fighting System. In the medieval-Japan-themed Legend of the Five Rings, the mechanism is called "bowing". A few games, such as the City of Heroes Collectible Card Game, use several different rotational increments (90, 180, and 270 degrees), each denoting a different card status.

Tap (film)

Tap is a 1989 drama film written and directed by Nick Castle. It stars Gregory Hines and Sammy Davis, Jr.

Plot

Max Washington (Gregory Hines), just released from prison after serving time for burglary, is a talented tap dancer. His late father owned a dance studio that is now run by Little Mo (Sammy Davis, Jr.), whose daughter Amy Simms (Suzzanne Douglas) gives lessons to children. Back on the streets, Max isn't interested in dancing again but he is interested in seeing Amy, his former girlfriend. A local gangster, Nicky, doesn't care for Max personally but does try to recruit him to take part in a robbery. Amy has a job as dancer in an upcoming Broadway show and tells its choreographer about Max, hoping to land him a role in the chorus. Max is reluctant to agree to it, then incensed when he is humiliated during the auditions. Max must decide whether to swallow his pride and dance the way the man wants, or give up his art once and for all and return to a life of crime.

Production

Tap (valve)

A tap (also spigot or faucet: see usage variations) is a valve controlling the release of a liquid or gas.

Nomenclature

British Isles

US

Types

Liquid

Water for baths, sinks and basins can be provided by separate hot and cold taps; this arrangement is common in older installations, particularly in public washrooms/lavatories and utility rooms/laundries. In kitchens and bathrooms mixer taps are commonly used. In this case, hot and cold water from the two valves is mixed before reaching the outlet, allowing the water to emerge at any temperature between that of the hot and cold water supplies. Mixer taps were invented by Thomas Campbell of Saint John, New Brunswick and patented in 1880.