Monday, May 28, 2007
Wallpaper
Wallpaper is material which is used to coat and decorate the interior walls of home, offices, and other buildings; it is one part of interior decoration. Wallpapers are usually sold in rolls and are place onto a wall using wallpaper glue.
Wallpapers can appear either plain so it can be decorated or with patterned graphics. Wallpaper printing techniques contain surface printing, gravure printing, silk screen-printing, and rotary printing. Mathematically speaking, there are seventeen basic patterns, described as wallpaper groups, which can be used to tile an countless plane. All artificial wallpaper patterns are based on these groups. A single model can be issued in several different color ways.
Wednesday, May 23, 2007
Parachute
By creating drag, a parachute is a soft fabric device used to slow the motion of an object through an atmosphere. Parachutes are usually used to slow the descent of a person or object to Earth or another celestial body within an atmosphere. Occasionally Drogue parachutes are also used to aid horizontal deceleration of a vehicle. From the French words para, protect or shield, and chute, the fall, parachute the word came. "Fall protection" is the real meaning of parachute. Recent parachutes are classified as semi-rigid wings, are quite maneuverable, and can facilitate a controlled descent similar to that of a glider.
Now parachutes are constructed from more durable woven nylon fabric, sometimes coated with silicone to improve performance and consistency over time, but it once made from silk. Manufacturers of parachutes switched to low-stretch materials like Dacron or zero-stretch materials like Spectra, Kevlar, Vectran and high-modulus aramids When the square parachutes were introduced.
Now parachutes are constructed from more durable woven nylon fabric, sometimes coated with silicone to improve performance and consistency over time, but it once made from silk. Manufacturers of parachutes switched to low-stretch materials like Dacron or zero-stretch materials like Spectra, Kevlar, Vectran and high-modulus aramids When the square parachutes were introduced.
Friday, May 18, 2007
Games
A game is a prepared or semi-structured activity, generally undertaken for enjoyment and sometimes also used as an learning tool. (The term "game" is also used to explain recreation of different activities e.g., for the purposes of training, study or prediction, etc,) Games are generally different from work, which is usually accepted out for payment, and from art, which is more concerned with the term of ideas. However, the distinction is not clear-cut, and a lot of games may also be considered work and/or art. Key components of games are goals, policy, challenge, and interactivity. Games generally involve mental or objective stimulation, and often both. Many games help develop useful skills, serve as a form of exercise, or else perform an educational, simulation or emotional role.
Tuesday, May 15, 2007
Seahorses
Seahorses are marine fish belonging to the genus Hippocampus of the family Syngnathidae, which also includes pipefish. They are found in temperate and tropical waters all over the world.
Seahorses range in size from 16 mm to 35 cm. Seahorses and pipe fishes are notable for being the only species in which males become "pregnant”. The seahorse is a true fish, with a dorsal fin located on the lower body and pectoral fins located on the head near their gills. Some species of seahorse are partly transparent and are rarely seen in pictures.
Seahorse populations have been endangered in recent years by over fishing. The seahorse is used in traditional Chinese herbology, and as many as 20 million seahorses may be caught each year and sold for this purpose.
Import and export of seahorses has been controlled under CITES since May 15, 2004.Sea dragons are close relatives of seahorses but have bigger bodies and leaf-like appendages which enable them to hide among floating seaweed or kelp beds. Sea dragons feed on larval fishes and amphipods, such as small shrimp-like crustaceans called mysids, sucking up their prey with their small mouths. Many of these amphipods feed on red algae that thrives in the shade of the kelp forests where the sea dragons live.
Seahorses range in size from 16 mm to 35 cm. Seahorses and pipe fishes are notable for being the only species in which males become "pregnant”. The seahorse is a true fish, with a dorsal fin located on the lower body and pectoral fins located on the head near their gills. Some species of seahorse are partly transparent and are rarely seen in pictures.
Seahorse populations have been endangered in recent years by over fishing. The seahorse is used in traditional Chinese herbology, and as many as 20 million seahorses may be caught each year and sold for this purpose.
Import and export of seahorses has been controlled under CITES since May 15, 2004.Sea dragons are close relatives of seahorses but have bigger bodies and leaf-like appendages which enable them to hide among floating seaweed or kelp beds. Sea dragons feed on larval fishes and amphipods, such as small shrimp-like crustaceans called mysids, sucking up their prey with their small mouths. Many of these amphipods feed on red algae that thrives in the shade of the kelp forests where the sea dragons live.
Wednesday, May 09, 2007
CD-ROM
CD-ROM (an abbreviation of "Compact Disc read-only memory") is a Compact Disc that contains information accessible by a computer. While the Compact Disc format was formerly designed for music storage and playback, the format was later adapted to hold any form of binary data. CD-ROMs are commonly used to distribute computer software, including games and multimedia applications, though any data can be stored (up to the capacity limit of a disc). Some CDs seize both computer data and audio with the latter capable of being played on a CD player, whilst data (such as software or digital video) is only usable on a computer. These are called Enhanced CDs.
Although many people use lowercase letters in this acronym, proper appearance is in all capital letters with a hyphen between CD and ROM. It was also suggested by some, specially soon after the technology was first released, that CD-ROM was an acronym for "Compact Disc read-only-media", or that it was a more 'correct' definition. This was not the purpose of the original team who developed the CD-ROM, and common acceptance of the 'memory' definition is now almost universal. This is probably in no small part due to the prevalent use of other 'ROM' acronyms such as Flash-ROMs and EEPROMs where 'memory' is the correct term.
Although many people use lowercase letters in this acronym, proper appearance is in all capital letters with a hyphen between CD and ROM. It was also suggested by some, specially soon after the technology was first released, that CD-ROM was an acronym for "Compact Disc read-only-media", or that it was a more 'correct' definition. This was not the purpose of the original team who developed the CD-ROM, and common acceptance of the 'memory' definition is now almost universal. This is probably in no small part due to the prevalent use of other 'ROM' acronyms such as Flash-ROMs and EEPROMs where 'memory' is the correct term.
