SWAP (instrument)

The "Sun Watcher using Active Pixel System Detector and Image Processing" (SWAP) telescope is a compact EUV imager on board the PROBA2 mission that will observe the Sun in extreme ultraviolet (EUV). SWAP will provide images of the solar corona at a temperature of roughly 1 million degrees. This instrument was built upon the heritage of the Extreme ultraviolet Imaging Telescope (EIT) which monitors the solar corona since 1996.

SWAP will continue the systematic CME (coronal mass ejection) watch program at an improved image cadence (typically 1 image every minute). With this higher cadence, SWAP will monitor events in the low solar corona that might be relevant for space weather. These events include EIT waves (global waves propagating across the solar disc from the CME eruption site), EUV dimming regions (transient coronal holes from where the CME has lifted off) and filament instabilities (a specific type of flickering during the rise of a filament). SWAP will also take advantage of offpointings provided by the agility featured of PROBA2 platform to follows coronal mass ejections.

Instrument

Instrument may refer to:

Science and technology

Instrument (film)

Instrument is a documentary film directed by Jem Cohen about the band Fugazi. Cohen's relationship with band member Ian MacKaye extends back to the 1970s when the two met in high school in Washington, D.C.. The film takes its title from the Fugazi song of the same name, from their 1993 album, In on the Kill Taker.

Editing of the film was done by both Cohen and the members of the band over the course of five years. It was shot from 1987 through 1998 on super 8, 16mm and video and is composed mainly of footage of concerts, interviews with the band members, practices, tours and time spent in the studio recording their 1995 album, Red Medicine.

The film also includes portraits of fans as well as interviews with them at various Fugazi shows around the United States throughout the years. The Instrument Soundtrack by Fugazi was released in conjunction with the film. It consisted primarily of instrumental and unreleased songs (including many demo cuts from End Hits, their next album after the soundtrack).

Instrument Soundtrack

Instrument Soundtrack is a 1999 album by American post-hardcore band Fugazi.

Background

It is a mainly instrumental soundtrack for the documentary (Instrument) about the band produced by the band and filmmaker Jem Cohen.

The soundtrack mostly consists of previously unreleased songs and studio outtakes culled from Fugazi's history to that point, as well as seven demo versions of songs from their proper albums (six from 1998's End Hits and one from 1993's In on the Kill Taker).

Of particular note is the song "I'm So Tired", a piano ballad played and sung by Ian MacKaye, which is a significant departure from Fugazi's usual post-hardcore sound.

The riff from "Lusty Scripps" was played in Fugazi's final live show, in the break between the main set and the encore.

Track listing

Swap

Swap or SWAP may refer to:

Finance

Science and technology

Other

See also

Swap (finance)

A swap is a derivative in which two counterparties exchange cash flows of one party's financial instrument for those of the other party's financial instrument. The benefits in question depend on the type of financial instruments involved. For example, in the case of a swap involving two bonds, the benefits in question can be the periodic interest (coupon) payments associated with such bonds. Specifically, two counterparties agree to exchange one stream of cash flows against another stream. These streams are called the legs of the swap. The swap agreement defines the dates when the cash flows are to be paid and the way they are accrued and calculated. Usually at the time when the contract is initiated, at least one of these series of cash flows is determined by an uncertain variable such as a floating interest rate, foreign exchange rate, equity price, or commodity price.

The cash flows are calculated over a notional principal amount. Contrary to a future, a forward or an option, the notional amount is usually not exchanged between counterparties. Consequently, swaps can be in cash or collateral.

Swap (computer science)

In computer programming, the act of swapping two variables refers to mutually exchanging the values of the variables. Usually, this is done with the data in memory. For example, in a program, two variables may be defined thus (in pseudocode):

(In many programming languages where the swap function is built-in; in C++, overloads are provided allowing std::swap to swap some large structures in O(1) time.) After swap() is performed, x will contain the value 0 and y will contain 1; their values have been exchanged. Of course, this operation may be generalized to other types of values, such as strings, aggregated data types and comparison sorts, utilize swaps to change the positions of data.

Using a temporary variable

The simplest and probably most widely used method to swap two variables is to use a third temporary variable:

While this is conceptually simple and in many cases the only convenient way to swap two variables, it uses extra memory. Although this should not be a problem in most applications, the sizes of the values being swapped may be huge (which means the temporary variable may occupy a lot of memory as well), or the swap operation may need to be performed many times, as in sorting algorithms.