Helium (disambiguation)

Helium is chemical element. It may also refer to its isotopes:

Helium may refer to:

In science

Other

Helium-3

Helium-3 (He-3, also written as ³He) is a light, non-radioactive isotope of helium with two protons and one neutron, in contrast with two neutrons in common helium. Its hypothetical existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while he was working at the University of Cambridge Cavendish Laboratory. Oliphant had performed experiments in which fast deuterons collided with deuteron targets (incidentally, the first demonstration of nuclear fusion). Helium-3 was thought to be a radioactive isotope until helions were also found in samples of natural helium, which is mostly helium-4, taken both from the terrestrial atmosphere and from natural gas wells.

Helium-4

Helium-4 (4
2He or 4He) is a non-radioactive isotope of the element helium. It is by far the most abundant of the two naturally occurring isotopes of helium, making up about 99.99986% of the helium on Earth. Its nucleus is identical to an alpha particle, and consists of two protons and two neutrons.

Alpha decay of heavy elements in the Earth's crust is the source of most naturally occurring helium-4 on Earth. While it is also produced by nuclear fusion in stars, most helium-4 in the Sun and in the universe is thought to have been produced by the Big Bang, and is referred to as "primordial helium". However, primordial helium-4 is largely absent from the Earth, having escaped during the high-temperature phase of Earth's formation. Radioactive decay from other elements is the source of most of the helium-4 found on Earth, produced after the planet cooled and solidified.

Helium-4 makes up about one quarter of the ordinary matter in the universe by mass, with almost all of the rest being hydrogen.

Dana, Jordan

Dana

Dana (ضانا) is a small village near the city of Tafilah, in central-western Jordan. It is situated on the edge of a large natural gorge, Wadi Dana and enjoys spectacular view over Wadi Araba.

Dana is about 500 years old, and preserves many aspects of Jordanian villages of the 19th century villages of Jordan. It hosts Dana nature reserve, one of Jordan's premier nature reserves with eco-tourism facilities.

Dana is home to several hotels including the RSCN's Guest House and a hotel run by and for the benefit of the local community known simply as the Dana Hotel (operated by Dana and Qadisiyah Local Community Cooperative  ::جمعية أبناء ضانا والقادسية التعاونية http://www.facebook.com\dana.cooperative )

External links

Dana Hotel: http://www.facebook.com\dana.hotel.jordan Dana and Qadisiyah Local community cooperative:http://www.facebook.com\dana.cooperative

Coordinates: 30°39′N 35°36′E / 30.650°N 35.600°E / 30.650; 35.600

Dana (car)

Dana was the brand name of a car built by Hakon Olsen, who had created the Maskinfabriken Dana in Copenhagen, Denmark. The car had a Peugeot air-cooled 6 hp engine and was built between 1908 and 1914 with minor modifications. The end of its (limited) production has been attributed to different company priorities after the outbreak of World War I.

External link/Reference

Dana (surname)

Dana (/ˈdeɪnə/ or /ˈdænə/) as a surname may have several origins. In England, it came from dann, the valley of a meadow, and it may mean the dweller of that valley. In Continental Europe, it probably came from Dane (or Danish, from Denmark). This surname is related to Danese in Italy and it can be found mostly in the Piedmont region. It may also be a modification of Huguenot French origin, probably a variant of d'Aunay, of geographical origin. It may be also a Gaelic patronymic, since it is a common forename in Ireland. Dana is a relatively common surname in the USA, ranking 7161 out of 88,799 in the 1990 U.S. Census. Dana is also the Persian word for wisdom.

At least into the first half of the 19th century, many American Danas were descended or of close relatives to Richard Henry Dana (including William G. Dana), who arrived in Cambridge, Massachusetts around 1640.

People with the surname Dana