Oso
Oso, or OSO, may refer to:
Places
Other
References
OSO 3
OSO 3 (Orbiting Solar Observatory 3), or Third Orbiting Solar Observatory (known as OSO C before launch) was launched on March 8, 1967, into a nearly circular orbit of mean altitude 550 km, inclined at 33° to the equatorial plane. Its on-board tape recorder failed on June 28, 1968, allowing only the acquisition of sparse real-time data during station passes thereafter; the last data were received on November 10, 1969. OSO 3 reentered the Earth's atmosphere and burned up on April 4, 1982.
Like all the American Orbiting Solar Observatory (OSO) series satellites, it had two major segments: one, the "Sail", was stabilized to face the Sun, and carried both solar panels and Sun-pointing experiments for solar physics. The other, "Wheel" section, rotated to provide overall gyroscopic stability and also carried sky scanning instruments that swept the sky as the wheel turned, approximately every 2 sec.
Instrumentation
The Sail carried a hard X-ray experiment from UCSD, with a single thin NaI(Tl) scintillation crystal plus phototube enclosed in a howitzer-shaped CsI(Tl) anti-coincidence shield. The energy resolution was 45% at 30 keV. The instrument operated from 7.7 to 210 keV with 6 channels. The Principal Investigator (PI) was Prof. Laurence E. Peterson of UCSD. Also in the wheel was a cosmic gamma-ray (>50 MeV) sky survey instrument contributed by MIT, with PI Prof. William L. Kraushaar.
Osmium tetroxide
Osmium tetroxide (also osmium(VIII) oxide) is the chemical compound with the formula OsO4. The compound is noteworthy for its many uses, despite the rarity of osmium. It also has a number of interesting properties, one being that the solid is volatile. The compound is colourless, but most samples appear yellow. This is most likely due to the presence of the impurity OsO2, which is yellow-brown in colour.
Physical properties
Osmium(VIII) oxide forms monoclinic crystals. It has a characteristic acrid chlorine-like odor. The element name osmium is derived from osme, Greek for odor. OsO4 is volatile: it sublimes at room temperature. It is soluble in a wide range of organic solvents. It is also moderately soluble in water, with which it reacts reversibly to form osmic acid (see below).Pure osmium(VIII) oxide is probably colourless and it has been suggested that its yellow hue is due to osmium dioxide (OsO2) impurities. The osmium tetroxide molecule is tetrahedral and therefore non-polar. This nonpolarity helps OsO4 penetrate charged cell membranes. OsO4 is 518 times more soluble in carbon tetrachloride than in water.
Tambora
Tambora may refer to:
Music
Geography
- Tambora culture, a village and associated culture on Sumbawa, destroyed by the 1815 eruption of Mount Tambora
- Tambora language, the associated language
See also
Bombo criollo
The bombo criollo, or simply bombo, is a family of Latin American drums derived from the European bass drum (also called in Spanish bombo). These drums are of smaller dimensions than the orchestral bass drum, and their frame can be made of wood or steel. They can be held vertically or diagonally on the body or a stand. The specific make of the instrument depends on the regional tradition. In Argentina, the bombo criollo is called bombo legüero. In Cuba, it is known as bombo de comparsa due to its use in comparsas. In other countries, the term tambora is commonly used.
The bombo should not be confused with the Puerto Rican bomba, a genre of music played with hand drums called barriles de bomba (bomba barrels), which are unrelated to the European bass drums.
Argentina
The bombo legüero is a common instrument in Argentine folk traditions such as zamba and chacarera. The body of the drum is made out of a hollowed tree trunk, and the head is made of animal skins.
Cuba
The bombo de comparsa is the lowest drum used in conga santiaguera, the music of the street carnivals from Santiago de Cuba. They are tuneable, two-headed military drums introduced in the island by the Spanish settlers.
Tambora (Venezuelan drum)
In Gaita Zuliana music, from Venezuela, in South America, the tambora is a one-headed drum played with sticks. The player can sit on it or put it between his or her legs to perform rhythms on the instrument, sticking on the head, on the rim or on the body of the drum.
References
External links
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