Swan

Swans are birds of the family Anatidae within the genus Cygnus. The swans' close relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. Sometimes, they are considered a distinct subfamily, Cygninae. There are six or seven species of swan in the genus Cygnus; in addition there is another species known as the coscoroba swan, although this species is no longer considered one of the true swans. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure, and if a mate dies, the remaining swan will take up with another. The number of eggs in each clutch ranges from three to eight.

Etymology and terminology

The English word 'swan', akin to the German Schwan, Dutch zwaan and Swedish svan, is derived from Indo-European root *swen (to sound, to sing). Young swans are known as swanlings or as cygnets, from Greek κύκνος, kýknos and from the Latin word cygnus ("swan") and the Old French suffix -et ("little"). An adult male is a cob, from Middle English cobbe (leader of a group); an adult female is a pen.

Swan (manga)

Swan (スワン) is a shōjo manga by Kyoko Ariyoshi. The shōjo magazine Margaret serialized the story in Japan during the seventies. 21 volumes were released. In North America the story was published by CMX, but the series was abandoned after 15 volumes due to the closure of the imprint. The plot mostly follows a young girl, Masumi, as she struggles to become a ballerina.

Plot

The first volume begins with Masumi sneaking backstage after a Tokyo ballet performance in order to express her admiration for the lead dancers, Alexei Sergeiev and Maria Prisetskaya . However, when she meets the stars, Masumi becomes tongue-tied and clumsily begins to dance the Odile Variation from Swan Lake. Sergeiev and Prisetskaya graciously excuse her, saying that nothing could give them more happiness than her physical expression of appreciation, and Masumi returns home slightly embarrassed. Later, Masumi receives an invitation to enter a nationwide ballet competition. The competition is being held to discover the best ballet students in Japan, in order to invite them to an exclusive ballet school designed to improve the quality of Japanese ballet. Her impromptu dance for Sergeiev and Prisetskaya captured the attention of Sergeiev, and so Masumi goes to Tokyo in order to compete.

Swan (nuclear primary)

Swan was a U.S. test nuclear explosive, which was developed into the XW-45 warhead.

It was tested standalone on June 22, 1956 in shot Redwing Inca. It was tested again as the primary of a thermonuclear device on July 2, 1956 in shot Redwing Mohawk. Both tests were successful. It subsequently served as the primary in numerous thermonuclear devices during the 1950s.

Most subsequent U.S. primaries are Swan-derived, including the Robin, the Tsetse, the Python, and the much later (asymmetrical) ovoid (prolate) primaries.

Design features

The Swan device is the first design to incorporate a two-point hollow-pit air lens implosion assembly together with fusion boosting.

The Swan device had a yield of 15 kilotons, weighed 105 lb (47.6 kg), and had a (symmetrical) ovoid (non-prolate) shape with a diameter of 11.6 inches (29.5 cm) and a length of 22.8 inches (58 cm), a length to diameter ratio of 1.97.

The above schematic illustrates what were probably its essential features.

One-point safety

Her Majesty's Australian Ship

Her or His Majesty's Australian Ship (HMAS) is a ship prefix used for commissioned units of the Royal Australian Navy (RAN). This prefix is derived from HMS (Her/His Majesty's Ship), the prefix used by the Royal Navy of the United Kingdom, and can be equally applied to warships and shore bases (as Australia follows the British tradition of referring to naval establishments as ships or stone frigates).

On 10 July 1911, King George V granted the title of Royal Australian Navy to the naval forces of Australia. At the same time, the prefix and acronym were approved for use in identifying units commissioned into the RAN. The prefix had been used prior to formal approval, with the torpedo-boat destroyer Parramatta commissioned with the HMAS prefix on 1 March 1911.

The prefix refers to the King or Queen of Australia, who is also equally and separately the British monarch. The first word of the prefix changes depending on the gender of the reigning Australian monarch.