Alert messaging

Alert messaging (or alert notification) is machine-to-person communication that is important or time sensitive. An alert may be a calendar reminder or a notification of a new message.

Alert messaging emerged from the study of Personal Information Management (PIM), the science of discovering how people perform certain tasks to acquire, organize, maintain, retrieve and use information relevant to them. Alert notification is a natural evolution of the concept of RSS which makes it possible for people to keep up with web sites in an automated manner. Alerting makes it possible for people to keep up with the information that matters most to them.

Alerts are typically delivered through a notification system and the most common application of the service is machine-to-person communication. Very basic services provide notification services via email or SMS. More advanced systems (for example AOL) provides users with the choice of selecting a preferred delivery channel such as e-mail, Short Message Service (SMS), instant messaging (IM), via voice through voice portals, desktop alerts and more. Novel approaches provide users with the ability to schedule their own alerts (for example Google Calendar). The most sophisticated service providers embrace all capabilities, aggregating a multitude of reminder, notifications and alert, catering the delivery system to the specific context of the content being delivered thus enabling users to create sophisticated scenarios.

Daddy Yankee

Ramón Luis Ayala Rodríguez (born February 3, 1976), known by his stage name Daddy Yankee, is a Puerto Rican reggaeton singer, songwriter, producer and actor. Ayala was born in Río Piedras, San Juan, Puerto Rico, and was raised in the neighborhood of Villa Kennedy Housing Projects.

Ayala aspired to be a professional baseball player, and tried out for the Seattle Mariners Major League baseball team. Before he could be officially signed, he was hit by a stray round from an AK-47 rifle while taking a break from a studio recording session with reggaeton mix tape icon DJ Playero. Ayala spent roughly one and a half years recovering from the wound; the bullet was never removed from his hip, and he credits the shooting incident with allowing him to focus entirely on a music career. Since then, he has sold over 18 million albums.

Musical career

1992–2003: Early music career

Daddy Yankee first appeared on the 1992 DJ Playero's Mixtape, Playero 34, with the song "So' Persigueme, No Te Detengas". Ayala was originally going to become a professional baseball player but he was shot in his leg while taking a break from a studio recording session. The bullet was never removed and he credits this incident with allowing him to pursue a musical career. He made a few songs talking about the shooting incident, but his most "complete" song about it was "6 De Enero", released in 2012. His first official studio project as a solo artist was No Mercy, which was released on April 2, 1995 through White Lion Records and BM Records in Puerto Rico. Early in his career he attempted to imitate the style of Vico C. He went on to emulate other artists in the genre, including DJ Playero, DJ Nelson, and DJ Drako, taking elements from their styles in order to develop an original style. In doing so, he eventually abandoned the traditional model of rap and became one of the first artists to perform reggaeton.

Static pressure

In fluid mechanics the term static pressure has several uses:

Static pressure in design and operation of aircraft

An aircraft’s altimeter is operated by the static pressure system. An aircraft’s airspeed indicator is operated by the static pressure system and the pitot pressure system.

The static pressure system is open to the exterior of the aircraft to sense the pressure of the atmosphere at the altitude at which the aircraft is flying. This small opening is called the static port. In flight the air pressure is slightly different at different positions around the exterior of the aircraft. The aircraft designer must select the position of the static port carefully. There is no position on the exterior of an aircraft at which the air pressure, for all angles of attack, is identical to the atmospheric pressure at the altitude at which the aircraft is flying. The difference in pressure causes a small error in the altitude indicated on the altimeter, and the airspeed indicated on the airspeed indicator. This error in indicated altitude and airspeed is called position error.