A19

A19, A-19, etc. may refer to:

Autostrada A19 (Italy)

The Autostrada A19 is a 199 km (124 mi) motorway on the island of Sicily that links Palermo to Catania. The motorway from Palermo follows the Tyrrhenian coast eastwards for 46 km and then turns south to go over the Madonie mountains and across the centre of the island to descend into the plain of Catania.

The motorway is connected to the A20 Messina-Palermo and is linked to the A18 Catania-Messina by the RA15 (Catania's Ring Road-West).

Palermo - Catania

English Opening

The English Opening is a chess opening that begins with the move:

A flank opening, it is the fourth most popular and, according to various databases, anywhere from one of the two most successful to the fourth most successful of White's twenty possible first moves. White begins the fight for the centre by staking a claim to the d5 square from the wing, in hypermodern style. Although many lines of the English have a distinct character, the opening is often used as a transpositional device in much the same way as 1.Nf3 – to avoid such highly regarded responses to 1.d4 as the Nimzo–Indian and Grünfeld defences, and is considered reliable and flexible.

The English derives its name from the English (unofficial) world champion, Howard Staunton, who played it during his 1843 match with Saint-Amant and at London 1851, the first international tournament. It did not inspire Staunton's contemporaries, and only caught on in the twentieth century. It is now recognised as a solid opening that may be used to reach both classical and hypermodern positions. Mikhail Botvinnik, Tigran Petrosian, Anatoly Karpov, Garry Kasparov and Magnus Carlsen employed it during their world championship matches. Bobby Fischer created a stir when he switched to it from his customary 1.e4 late in his career, employing it against Lev Polugaevsky and Oscar Panno at the Palma de Mallorca Interzonal in 1970 and in his 1972 world championship match against Boris Spassky.

List

A list is any enumeration of a set of items. List or lists may also refer to:

People

Places

Enumerations

Computing

Organizations

Other uses

Homecoming (Heroes)

"Homecoming" is the ninth episode of the first season of the NBC science fiction drama series Heroes.

Plot

The episode begins with Claire and her friend Zach walking into the high school amphitheater with lunch as Claire's former cheerleader friends wait anxiously for the results of the Homecoming Court vote. Claire downplays the entire ritual, but Zach encourages her to check the posting and see if she had won. To Claire's surprise, she has been voted Homecoming Queen, with her main rival, Jackie, merely a member of the court. Astonished, Claire and the rest of the cheerleaders turn around to see much of the student body proclaiming congratulations and support for Claire. She later discovers that Zach had been campaigning for her, working to win the "unpopular vote" by letting everyone know that Claire is not like the popular Jackie. Jackie, however, spoils the moment in an attempt to deflate Claire's victory by poking fun at Zach. Claire, beginning to see the importance of Zach's friendship to her, promptly punches Jackie in the face.

Flight dynamics

Flight dynamics is the study of the performance, stability, and control of vehicles flying through the air or in outer space. It is concerned with how forces acting on the vehicle influence its speed and attitude with respect to time.

In fixed-wing aircraft, the changing orientation of the vehicle with respect to the local air flow is represented by two critical parameters, angle of attack ("alpha") and angle of sideslip ("beta"). These angles describe the vector direction of airspeed, important because it is the principal source of modulations in the aerodynamic forces and moments applied to the aircraft.

Spacecraft flight dynamics involve three forces: propulsive (rocket engine), gravitational, and lift and drag (when traveling through the earths or any other celestial atmosphere). Because aerodynamic forces involved with spacecraft flight are very small, this leaves gravity as the dominant force.

Aircraft and spacecraft share a critical interest in their orientation with respect to the earth horizon and heading, and this is represented by another set of angles, "yaw," "pitch" and "roll" which angles match their colloquial meaning, but also have formal definition as an Euler sequence. These angles are the product of the rotational equations of motion, where orientation responds to torque, just as the velocity of a vehicle responds to forces. For all flight vehicles, these two sets of dynamics, rotational and translational, operate simultaneously and in a coupled fashion to evolve the vehicle's state (orientation and velocity) trajectory.

Roads (novel)

Roads is a short novel by author Seabury Quinn. It was published by Arkham House in 1948 in an edition of 2,137 copies. It was Arkham House's first illustrated book and the author's first hardcover.

The story, in an unrevised edition, originally appeared in the January 1938 issue of Weird Tales magazine.

Roads is a Christmas story that traces the origins of Santa Claus from the beginning of the Christian era.

The story is split into three parts:

Roads was reissued in 2005 by Red Jacket Press, as a fully authorized facsimile reproduction of the original Arkham House edition.

Notes

References