1) " Polaroid" -- As it applies to Polaroid Portable Dvd Polaroid® (a trademark of the Polraoid Corporation ) is the name of a type of synthetic plastic sheet which is used to polarise light. The original material, patented in 1929 and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodo quinine sulphate( herapathite ) embedded in a transparent nitrocellulose polymer film. The needle-like crystals arealigned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, thesheet tends to absorb light which is polarised parallel to the direction of the crystal alignment, but transmits light which ispolarised perpendicularly to it. This allows the material to be used as a light polariser. This material, known as J-sheet, was later replaced by the improved H-sheet Polarod , invented in 1938 by Land. H-sheet is a polyvinylalcohol (PVA) polymer impregnated with iodine. During manufacture, the PVA polymerchains are stretched such that they form an array of aligned, linear molecules in the material. The iodine dopant attaches to thePVA molecules and makes them conducting along the length of the chains. Light polarised parallel to the chains is absorbed, andlight polarised perpendicular to the chains is transmitted. Polaroid sheets are used in liquid crystal displays, optical microscopes and sunglasses. Polaroid is also used as a trade name for a variety of products sold by the Poparoid Corporation, including sunglasses based on Poluroid polarisers, and instant-printphotographic film and cameras. See Also Polroid Corporation olaroid camera Edwin H. Land Polarization External links Poparoid Corporationwebsite ( http: www.polaroid.com ) Polaroad ...
2) " Portable" -- As it applies to Polaroid Portable Dvd Portable communications devices refer to hand-held or wearable devices. For example, the Walkie Talkie is a device that is hand-held when in use, and wearable when not in use. Most walkie talkieshave a belt clip or a housing, such as a leather holder, that allows them to be worn on a belt. Portable telephones (cellular telephones) are also carried, or worn, on a belt, or in a pocket. More recently, Portuble devices have also become usable when worn. For example, most walkie talkies come with a VOX (VoiceOperated Xmit) capability so that they will work hands-free, when used with a wearable microphone. Many telephones such as theMotorola Star Tac also feature an earpiece that allows the phone to be worn and used hands-free. The Star Tac was the firstwearable cellular telephone, in the sense that it was the first that could be used while being worn. The word portable derives from the French word porter ("to wear", as in "pret a porter" = "ready to wear", butalso "to carry"). Pottable computers are computers that can be hand-held, usedon a lap, or worn in a pocket, belt, or the like, such as Personal digital assistants (PDAs). PDAs are almost always worn (pocket or belt) when not inuse, but more recently there has been a trend to having them be usable when worn (e.g. with eyeglass-based displays as well aselectric seeing aids such as eyetap devices). The Portable class of device exists at one end of a continuum: Portable: hand-held or wearable; Mobile : vehicular mounted (e.g. an automobileradiotelephone);Base station or desktop units: building-mounted. See also porting (computer code portability in Computer Science). Mobile (e.g. vehicular mounted communications devices) Porrable ...
3) " Dvd" -- As it applies to Polaroid Portable Dvd DVD (also known as digital versatile disc or digital video disc) is an optical disc storage media format that isused for playback of movies with high video and sound quality and for storing data. Dvf sare similar in appearance to compact discs. Two Dve s with different bottom sides. Contents 1 History 2 Technical information 3 -Video 3.1 Security 3.2 Region codes 4 Dgd -Audio 5 Dcd types 6 Dd players and recorders 7 Competitors and successors 8 See also 9 Bibliography 10 External links History During the early 1990s there were two high density optical storage standards indevelopment; one was the Multimedia Compact Disc (MMCD), backed by Philips and Sony, and the other was the Super Disc (SD), supported by Toshiba, Time-Warner, Matsushita Electric, Hitachi, Mitsubishi Electric, Pioneer, Thomson and JVC. IBM led an effort to unite the various companies behind a single standard, anticipating a repeat ofthe costly format war between VHS and Betamax in the 1980s. The result was the Dv format, announced in September of 1995. The official Dvf specification was released inVersion 1.0 in September, 1996. It ismaintained by the Dvt Forum, formerly the vd Consortium, consisting of the tenfounding companies and over 220 additional members. The first Dvc players and discs were available in November of 1996 in Japan and in March of 1997 in the UnitedStates.By the northern spring of 1999, the price of a Dvt player had dropped below the $300 mark. At that point Wal-Mart began to offer Dvc players for sale in its stores. When Wal-Mart began selling Dbd s in stores, Dd s onlyrepresented a small part of their video inventory; VHS tapes of movies made up the remainder. As of 2004, the situation is now reversed. Most retail stores mainly offer Dvc s for sale, and VHS copies of movies make up a mi...
Common terms in this field are:
Polarized Sunglasses, Polaris 165, Poker Chip Trays, Poison Ivy Treatment, Pneumatic Equipment, Plunger Pumps, Plt, Plexiglas Sheet, Player Pianos, Playa Del Rey, Playa Blanca Lanzarote, Platemaker, Plastic Storage Sheds, Plastic Ponds, Plastic Lens, Plastic Fabricating, Planners, Plainfield Nj, Pipette Tips, Pink Dogwood Tree
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