Signal

Signal, signals, signaling or signalling may refer to:

Science

Computing

Communications

Signals (Mal Waldron album)

Signals is an album by American jazz pianist Mal Waldron featuring performances recorded in Baarn, Holland in 1971 and released on the Freedom label.

Reception

The Allmusic review by Scott Yanow awarded the album 4 stars stating "this set features a solo outing by Waldron that fully displays his continually evolving style. He had moved away from his earlier Thelonious Monk influence to an extent and developed his own brooding style which made expert use of repetition. Waldron's four originals give him plenty of opportunity to stretch out".

Track listing

Personnel

References

Military communications

Military communications or military signals involve all aspects of communications, or conveyance of information, by armed forces. Military communications span from pre-history to the present. The earliest military communications were delivered by humans on foot. Later, communications progressed to visual and audible signals, and then advanced into the electronic age. Examples from Jane's Military Communications include text, audio, facsimile, tactical ground-based communications, terrestrial microwave, tropospheric scatter, naval, satellite communications systems and equipment, surveillance and signal analysis, encryption and security and direction-finding and jamming.

History

The first military communications involved the use of runners or the sending and receiving of simple signals (sometimes encoded to be unrecognizable). The first distinctive uses of military communications were called "signals". Modern units specializing in these tactics are usually designated as "signal corps". The Roman system of military communication (cursus publicus or cursus vehicularis) is an early example of this. Later, the terms "signals" and "signaler" became words referring to a highly-distinct military occupation dealing with general communications methods (similar to those in civil use) rather than with weapons.

Mimosa caesalpiniaefolia

The Sabiá, scientific name Mimosa caesalpiniaefolia, is a species of tree with white flowers, a legume in the Fabaceae family. This species is found only in Brazil.

Sarbi

Sarbi (11 September 2002 – 27 March 2015) was an Australian special forces explosives detection dog that spent almost 14 months missing in action (MIA) in Afghanistan having disappeared during an ambush on 2 September 2008. Sarbi was later rediscovered by an American soldier, and was reunited with Australian forces pending repatriation to Australia. Her name is sometimes spelled 'Sabi'.

Background

Sarbi was a female black Labrador/Newfoundland cross trained in explosives detection. For her role in Afghanistan, Sarbi was trained to detect improvised explosive devices (IEDs) in Orūzgān Province. Contradictory reports at the time of her discovery put Sarbi's age at either four or ten years old. Sarbi had previously been used by the Incident Response Regiment during the 2006 Commonwealth Games held in Melbourne, Australia, before being deployed to Afghanistan as part of the Australian Army's Operation Slipper. Operation Slipper is the name of Australian military's part in to the ongoing War in Afghanistan, in which a Taliban insurgency is fighting forces of the International Security Assistance Force. When she disappeared, Sarbi was in her second tour of duty in Afghanistan, having previously been deployed in 2007.

Sabi (Korea)

Sabi was the capital of the Korean kingdom of Baekje from 538 until Baekje's fall to Silla in 660. The site of Sabi is located in modern-day Buyeo County,South Chungcheong Province, in South Korea.

Sabi Fortress also is known by the names Busosanseong, Sabiseong or Soburiseong Fortress, it consists of the inner fortress divided by roads centered on the royal palace, a defensive fortress called "Buso Mountain Fortress", and outer walls surrounding the palace. The inner part of the fortress involves 5 district area, where the existence of district was verified through rocks, roof titles, and wooden tablets etched with the name of administratine areas. It is also assumed that the royal palace of Baekje had been located on this site.

Gallery

Gate of Buso Mountain Fortress

Gate of Buso Mountain Fortress

Tombs in Neungsan-ri

Tombs in Neungsan-ri

References

See also

Coordinates: 36°16′55″N 126°54′45″E / 36.2819444544°N 126.91250001°E / 36.2819444544; 126.91250001

Relative direction

The most common relative directions are left, right, forward(s), backward(s), up, and down. No absolute direction corresponds to any of the relative directions. This is a consequence of the translational invariance of the laws of physics: nature, loosely speaking, behaves the same no matter what direction one moves. As demonstrated by the Michelson-Morley null result, there is no absolute inertial frame of reference. There are definite relationships between the relative directions, however. Left and right, forward and backward, and up and down are three pairs of complementary directions, each pair orthogonal to both of the others. Relative directions are also known as egocentric coordinates.

Traditions and conventions

Since definitions of left and right based on the geometry of the natural environment are unwieldy, in practice, the meaning of relative direction words is conveyed through tradition, acculturation, education, and direct reference. One common definition of up and down uses gravity and the planet Earth as a frame of reference. Since there is a very noticeable force of gravity acting between the Earth and any other nearby object, down is defined as that direction which an object moves in reference to the Earth when the object is allowed to fall freely. Up is then defined as the opposite direction of down. Another common definition uses a human body, standing upright, as a frame of reference. In that case, up is defined as the direction from feet to head, perpendicular to the surface of the Earth. In most cases, up is a directionally oriented position generally opposite to that of the pull of gravity.