curtossurtos

Random access memory (usually known by its acronym, RAM) is a kind of data storage used in computers. It takes the form of integrated circuits that permit the stored data to be accessed in any order — that is, at random and without the physical movement of the storage medium or a physical reading head.

The key benefit of RAM over types of storage which need physical movement is that retrieval times are short and consistent. Short because no physical movement is required, and consistent because the time taken to retrieve a piece of data does not depend on its current distance from a physical head; it requires practically the equal amount of time to access any piece of data stored in a RAM chip.

Because of this speed and consistency, RAM is used as 'main memory' or primary storage: the working area used for loading, displaying and manipulate applications and data. In most personal computers, the RAM is not an essential part of the motherboard or CPU—it comes in the easily upgraded form of modules called memory sticks or RAM sticks about the size of a few sticks of chewing gum, which can be quickly detached and replaced when they become damaged or too small for current purposes. A smaller amount of random-access memory is also integrated with the CPU, but this is usually referred to as "cache" memory, rather than RAM.

The disadvantage of RAM over physically moving media is cost, and the loss of data when power is turned off. For these reasons, almost all PCs have disc storage as "secondary storage". Small PDAs and music players (up to 8 GiB in Jan 2007) may allot with disks, but rely on flash memory, to retain data between sessions of use.

// posted by wibsio3 @ 9:45 PM 0 comments

A Trailer is normally an unpowered vehicle pulled by a powered vehicle, because powered trailers are more explicitly called potrailers. Commonly, the term trailer refers to such vehicles used for transport of goods and materials.

Trailer winches are intended to load (or unload) boats and other cargo to and from a trailer. The are invented a ratchet mechanism and cable. The handle on the ratchet mechanism is twisted to tighten or loosen the tension on the winch cable. There are both manual and motorized trailer winches

Popup campers are trivial, aerodynamic trailers that can be towed by a small car, such as the BMW Air Camper and the Coleman Bayside. They are built to be shorter than the tow vehicle, minimizing drag.

Others range from two-axle campers that can be pulled by most mid-sized pickups to trailers that are as long as the host country's law allows for drivers without individual permits. Larger campers tend to be fully integrated leisure vehicles, which often are used to tow single-axle dolly trailers to allow the driver to bring small cars on their travels.

// posted by wibsio3 @ 1:20 AM 0 comments

Vitamins are nutrients required in minute amounts for essential metabolic reactions in the body.The term vitamin does not consist of other essential nutrients such as dietary minerals, essential fatty acids, or essential amino acids, nor does it include the large number of other nutrients that promote health but that are not essential for life.Vitamins are bio-molecules that act both as catalysts and substrates in chemical reactions. When acting as a catalyst, vitamins are bound to enzymes and are called cofactors. Vitamins also act as coenzymes to hold chemical groups between enzymes. Folic acid, for example, carries various forms of carbon groups–methyl, formyl or methylene in the cell.Vitamins have been created as commodity chemicals and prepared widely available as inexpensive pills for several decades allowing supplementation of the dietary intake.

// posted by wibsio3 @ 2:11 AM 0 comments