Apex

Apex may refer to:

Astronomy

Biology

Places

Organizations

Apex (headdress)

The apex was a cap worn by the flamines and Salii at Rome. The essential part of the apex, to which alone the name properly belonged, was a pointed piece of olive-wood, the base of which was surrounded with a lock of wool. This was worn on the top of the head, and was held there either by fillets only, or, as was more commonly the case, was also fastened by means of two strings or bands, which were called apicula (Festus, s.v.), or offendices (Festus, s.v.), though the latter word is also interpreted to mean a kind of button, by which the strings were fastened under the chin (cf. Serv. ad Virg. Aen. ii.683, viii.664, x.270).

The flamines were forbidden by law to go into public, or even into the open air without the apex (Gellius x.15), and hence we find the expression of alicui apicem dialem imponere used as equivalent to the appointment of a Flamen Dialis (Livy vi.41). Sulpicius was deprived of the priesthood, only because the apex fell from his head whilst he was sacrificing (Valerius Maximus i.1 §5).

Apex (mollusc)

In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod.

Gastropods

The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod. The apex is the first-formed, and therefore the oldest, part of the shell.

To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away).

Coiled gastropod shells

The phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch.

Comparison of the apical part and the whole shell of Otukaia kiheiziebisu:

Limpet-like gastropod shells

Where this feature is present, the space under the apex of a patellate or patelliform (limpet-like) gastropod shell is called the apical cavity.

Levitation

Levitation (from Latin levitas "lightness") is the process by which an object is held aloft, without mechanical support, in a stable position.

Levitation is accomplished by providing an upward force that counteracts the pull of gravity (in relation to gravity on earth), plus a smaller stabilizing force that pushes the object toward a home position whenever it is a small distance away from that home position. The force can be a fundamental force such as magnetic or electrostatic, or it can be a reactive force such as optical, buoyant, aerodynamic, or hydrodynamic.

Levitation excludes floating at the surface of a liquid because the liquid provides direct mechanical support. Levitation excludes hovering flight by insects, hummingbirds, helicopters, rockets, and balloons because the object provides its own counter-gravity force.

Physics

Levitation (on Earth or any planetoid) requires an upward force that cancels out the weight of the object, so that the object does not fall (accelerate downward) or rise (accelerate upward). For positional stability, any small displacement of the levitating object must result in a small change in force in the opposite direction. The small changes in force can be accomplished by gradient field(s) or by active regulation. If the object is disturbed, it might oscillate around its final position, but its motion eventually decreases to zero due to damping effects. (In a turbulent flow, the object might oscillate indefinitely.)

Levitate (Bruce Hornsby album)

Levitate is the tenth studio album by Bruce Hornsby. It was Hornsby's third studio album with his touring band, Bruce Hornsby and the Noisemakers, and was his first release with Verve Records.

Somewhat a musical departure for Hornsby and the Noisemakers, Levitate features no piano solos. Many of the songs also feature lyrical motifs of science and nature.

The title track was used in Spike Lee's documentary Kobe Doin' Work. Invisible was featured in the Bobcat Goldthwait movie World's Greatest Dad, in which Hornsby also made a cameo appearance as himself.

Much like the 2004 release Halcyon Days, Levitate features guest artists and those close to Hornsby, most notably Eric Clapton, Hornsby's twin sons Russell and Keith, Grateful Dead lyricist Robert Hunter, and Hornsby's nephew R.S. Hornsby, who was killed in a car accident less than a week after recording a memorable guitar solo on "Continents Drift." The album has been dedicated to his memory.

Track listing

American Tragedy Redux

American Tragedy Redux is the second remix album by American rap rock band Hollywood Undead, taking songs exclusively off the band's 2011 studio album, American Tragedy, and remixing them. The first remix album was the Black Dahlia Remixes album, featuring three remixes of Hollywood Undead's single, "Black Dahlia". The album was released on November 21, 2011 by A&M/Octone Records. The original tracks on the album, which were on American Tragedy, were recorded following the induction of Daniel Murillo into the band in early 2010 and lasted until December. The tracks were then remixed by various DJ's and musicians during the band's World War III Tour with Asking Alexandria later in 2011. The album's first single, "Levitate (Digital Dog club mix)", was released on October 18, 2011, with a music video being released on October 24.

Background