The Ancient Romanfurniture, sigma was a semi-circular couch sometimes used at banquets instead of the triclinium. Its name comes from the lunate sigma (upper case C, lower case ϲ) — which resembles, but which is not at all related to, the Latin letterC and was used in Eastern forms of Greek writing and in the Middle Ages.
Notes
↑ The Roman banquet: images of conviviality, Katherine Dunbabin, 2003, p. 166
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.
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.
The SigmaAlphaEpsilon fraternity returned to the University of Iowa in spring 2024 following its removal for hazing in 2018 ... “Based on university records, there are no current occupants for the chapter structure for Sigma Alpha Epsilon.”.
1/ The ProtocolCouncil is live! ... Objectives and Responsibilities ... The initial cohort of external members includes SigmaPrime, represented by Mehdi Zerouali; Unit410, represented by Mike Reinhart; and Gonçalo Sá from Creed and Consensys Diligence ... ....
In a sea of red — red shirts, red hats, red shoes — members and friends of the Killeen Alumnae Chapter of DeltaSigmaThetaSorority, Inc. enjoyed a 90s R.E.D. Volution Throwback event at the Killeen Civic and Conference....
'Jesus H ... But where does the 'H' come from? ... Dr McClellan says ... Christ ... Dr McClellan says ... Iota, eta, sigma,' says Dr McClellan ... But there's another way to write the "S" called the "lunate sigma" which looks an awful lot like a C ... Iota, eta, sigma ... Christ ... .
The Maryville Daily Times
14 Jan 2025
The Maryville Daily Times
14 Jan 2025