PlayStation Portable

The PlayStation Portable (PSP) is a handheld game console developed by Sony. Development of the console was announced during E3 2003, and it was unveiled on May 11, 2004, at a Sony press conference before E3 2004. The system was released in Japan on December 12, 2004, in North America on March 24, 2005, and in the PAL region on September 1, 2005. It primarily competed with the Nintendo DS, as part of the seventh generation of video games.

The PlayStation Portable was the more powerful system when launched just after the Nintendo DS in 2004. It was the first real competitor to Nintendo's handheld domination, where many challengers, such as SNK's Neo Geo Pocket and Nokia's N-Gage, failed. Its GPU encompassed high-end graphics on a handheld, while its 4.3 inch viewing screen and multi-media capabilities, such as its video player and TV tuner, made the PlayStation Portable a major mobile entertainment device at the time. It also features connectivity with the PlayStation 3, other PSPs and the Internet. It is the only handheld console to use an optical disc format, Universal Media Disc (UMD), as its primary storage medium.

PTF

PTF may refer to:

  • Palomar Transient Factory, an astronomical survey program
  • Pedotransfer function, a concept used in soil science
  • Peter Tatchell Foundation, a British human rights organization
  • Phase transfer function, used for the optics of an imaging system
  • Police Task Force, former name of the Police Tactical Unit of the Singapore Police Force
  • Präzisionsteilefertigung Steffen Pfüller, a producer of high-tech precision parts and assemblies
  • Program temporary fix, an IBM locution to designate bug fixes
  • Platinum tetrafluoride

    Platinum tetrafluoride is the inorganic compound with the chemical formula PtF
    4
    . In the solid state, the compound features platinum(IV) in octahedral coordination geometry.

    Preparation

    The compound was first reported by Henri Moissan by the fluorination of platinum metal in the presence of hydrogen fluoride. A modern synthesis involves thermal decomposition of platinum hexafluoride.

    Properties

    Platinum tetrafluoride vapour at 298.15 K consists of individual molecules. The enthalpy of sublimation is 210 kJmol−1. Original analysis of powdered PtF4 suggested a tetrahedral molecular geometry, but later analysis by several methods identified it as octahedral, with four of the six fluorines on each platinum bridging to adjacent platinum centres.

    Reactions

    A solution of platinum tetrafluoride in water is coloured reddish brown, but it rapidly decomposes, releasing heat and forming an orange coloured platinum dioxide hydrate precipitate and fluoroplatinic acid. When heated to a red hot temperature platinum tetrafluoride decomposes to platinum metal and fluorine gas. When heated in contact with glass, silicon tetrafluoride gas is produced along with the metal.

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