Ayu

The ayu (アユ, 鮎, 年魚, 香魚) or sweetfish, Plecoglossus altivelis, is an amphidromous fish, the only species in the genus Plecoglossus and family Plecoglossidae. It is a relative of the smelts, and is placed in the order Osmeriformes. Native to the Palearctic ecozone, it occurs in rivers, lakes, and coastal waters of western Hokkaidō in Japan southward to the Korean Peninsula, China, and Hong Kong. The species has been extinct in Taiwan since 1967, although there are populations of re-introduced Japanese stocks in some of the northern streams.

The name "sweetfish" is due to the sweetness of its flesh. In reference to its typical one-year lifespan, it is also written as 年魚 ("year-fish"). The ayu is the prefectural fish of Gunma Prefecture and Gifu Prefecture.

Subspecies

Three subspecies are currently recognized, but their status is questioned and species may be monotypic:

African manatee

The African manatee (Trichechus senegalensis), also known as the West African manatee or seacow, is a species of manatee; it is mostly herbivorous (eats plants). African manatees can be found in much of the western region of Africa, from Senegal to Angola. Scientists do not know a lot about this species, but they hypothesize the African manatee is very similar to the West Indian manatee (Trichechus manatus).

Taxonomy

The African manatee was officially declared a species under the Trichechus senegalensis taxon in 1795 by the naturalist, Johann Heinrich Friedrich Link. No subspecies of this taxon are known, but unreliable claims have been made that there are morphological disparities between coastal manatee populations and isolated inland populations. After more research, no genetic evidence supports these claims and form any subspecies. The African manatee falls under the Trichechus genus with only two other species, the Amazonian manatee and the West Indian manatee, which are also sirenians.

Ayu (given name)

Ayu may refer to:

Shock

Shock may refer to:

Main uses

Social sciences

Medicine

In medicine, shock may refer to any of the following:

Physical sciences

Shock! (Cute song)

"Shock!" is the eleventh major single by Japanese idol pop group Cute. It was released on January 6, 2010, in both normal and limited editions, the limited edition containing a DVD with a version of the "Shock!" PV on it and coming with a different cover. The first press of each edition also contained a card with a serial number on it, used in an event draw to promote the single's release. This was the first single to be released after Erika Umeda's graduation, which also makes it the first single not to feature her. Airi Suzuki is "centred" in this single, taking on the main vocals. The single peaked at #1 on the Oricon daily charts, and #5 on the weekly charts. The single also reached #13 on the monthly chart for January, with a reported total of 23,389 copies sold.

Track listings

CD single

All lyrics written by Tsunku, all music composed by Tsunku.

Single V

Event V

Personnel

Shock (mechanics)

A mechanical or physical shock is a sudden acceleration caused, for example, by impact, drop, kick, earthquake, or explosion. Shock is a transient physical excitation.

Shock describes matter subject to extreme rates of force wtr to time. Shock is a vector that has units of an acceleration (rate of change of velocity). The unit g (or g) represents multiples of the acceleration of gravity and is conventionally used.

A shock pulse can be characterised by its peak acceleration, the duration, and the shape of the shock pulse (half sine, triangular, trapezoidal, etc.). The Shock response spectrum is a method for further evaluating a mechanical shock.

Shock measurement

Shock measurement is of interest in several fields such as