TET-1

TET-1 (German: Technologieerprobungsträger 1, Technology Experiment Carrier) is a microsatellite operated by the German Aerospace Center. It is the centre of the OOV (On Orbit Verification) Program, initiated to offer on-orbit verification possibilities to the German industrial and scientific aerospace community. TET is based on the satellite bus used for the BIRD satellite, which was launched in 2001.

The main contractor for Phase A (feasibility) was IABG. The final contract for Phases B, C, and D (definition/qualification, and production) and start was given to Kayser-Threde GmbH, a medium-sized aerospace company based in Munich belonging to the German OHB-System group. The environmental qualification was successfully conducted in the IABG space simulation centre in Munich.

TET-1 was carried to orbit as a secondary payload on a Soyuz-FG/Fregat carrier rocket which was launched from the Baikonur Cosmodrome on 22 July 2012. The primary payload of the launch was the Kanopus-V1 satellite, with the BelKA-2, Zond-PP and exactView-1 satellites also flying on the same rocket.

Têt (river)

The Têt (Catalan: Tet) is the largest river in Roussillon, southwestern France. It is 116 kilometres (72 mi) long. The Têt has its source at the foot of the Pic Carlit in the Pyrenees. It crosses the Pyrénées-Orientales département (Northern Catalonia) from West to East and ends in the Mediterranean Sea, near Perpignan (Catalan: Perpinyà).

Tributaries include

Towns along the river include

References

Tet (Morris Louis painting)

Tet (1958), by Morris Louis, is a painting composed of four fan-like stains of blues, greens, violets, and yellows. The colors converge and slide into each other, giving them the qualities of liquid. The pools at the bottom of the painting reveal the artist’s method and process; the colors have forged deltas originating from these concentrated areas of watered down pigment. Louis used gravity to manipulate the thinned paint, resulting in these streams and fans of color. Currently it is in the Whitney Museum of American Art and was exhibited in "American Art, 1940-1965: Traditions Reconsidered" and in the Whitney exhibit "Synthetic".

Morris Louis (née Morris Louis Bernstein) was an American painter who is often categorized in the second generation of Abstract Expressionists, but has also been placed in the Color Field artists and the Minimalists. His painting Tet, from 1958, is an example of his work with the staining method which he used for the majority of his career. Louis was a prodigy of the notable critic Clement Greenberg. Greenberg was introduced to Louis via Kenneth Noland, a friend of the artist who also lived in Washington DC. Greenberg in turn introduced Louis to galleries and to artists in New York such as Barnett Newman, Mark Rothko, and Helen Frankenthaler. It was Frankenthaler who created the technique of staining: a process using thinned paint and gravity on an unstretched and untreated canvas.

72 equal temperament

In music, 72 equal temperament, called twelfth-tone, 72-tet, 72-edo, or 72-et, is the tempered scale derived by dividing the octave into twelfth-tones, or in other words 72 equal steps (equal frequency ratios).  Play  Each step represents a frequency ratio of 2^1/72, or 16.67 cents, which divides the 100 cent "halftone" into 6 equal parts (100/16.6 = 6) and is thus a "twelfth-tone" ( Play ). 72 being divisible by 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, and 72, 72-tet includes those equal temperaments.

This division of the octave has attracted much attention from tuning theorists, since on the one hand it subdivides the standard 12 equal temperament and on the other hand it accurately represents overtones up to the twelfth partial tone, and hence can be used for 11-limit music. It was theoreticized in the form of twelfth-tones by Alois Hába and Ivan Wyschnegradsky, who considered it as a good approach to the continuum of sound. 72-et is also cited among the divisions of the tone by Julián Carrillo, who preferred the sixteenth-tone as an approximation to continuous sound in discontinuous scales.