Tuesday, July 31, 2007

Light Arrester

In telegraphy and telephony a lightning arrester is to be found where wires enter a structure, preventing harm to electronic instruments within and ensuring the protection of individuals near them. Lightning arresters, also called rush protector, are devices which are linked between each electrical conductor in a power and transportation systems and the earth. These provide a short circuit to the earth that is interrupted by a non-conductor over which lightning jumps. Its function is to limit the rise in voltage when a connections or power line is struck by lightning.

The non-conducting substance may consist of a semi-conducting material like silicon carbide or zinc oxide, or a spark gap. Primitive varieties of such flash gaps are simply open to the air, but more modern varieties are filled with dry gas and provided with a little amount of radioactive material to support the gas to ionize when the voltage across the gap reaches a particular level. Other designs of lightning arresters use a glow-discharge tube associated between the protected conductor and ground, or any one of a many of voltage-activated solid-state switches called varistors or MOV's. Lightning arresters built for substation use are consisting of a porcelain tube several feet in length and several inches in diameter, impressive devices, fill with disks of zinc oxide. A safety port is full on the side of the device to vent the occasional internal explosion without shocking the porcelain cylinder.

Tuesday, July 24, 2007

Hardware

Hardware is the general name that is used to express physical body of a technology.It can be apparatus such as keys, hinge, locks, latches, wire, handles, corners, shackles, plumbing supplies, tools, cutlery, utensils, and machine parts, mainly when they are made of metal. In the United States, hardware has been customarily sold in hardware stores.

Although often used interchangeably to mean "hand tools," hardware in olden times referred to the metal bits that were used to make wooden products stronger, more useful, and easier to build/assemble than if they did not have the benefit of metal fittings.In a looser logic, hardware can be a major military equipment, or electronic equipment, or computer equipment. On the other hand, people don't talk about computer stores as "hardware supplies".

In vernacular context, the term refers to trophies and other physical representations of award. The term "hardware" is used to specifically mean material or tangible parts of the computer when used in the context of computer systems and when compared to non-physical software running on the computer. Example: the CPU

Tuesday, July 17, 2007

Love

Love is a constellation of feelings and experiences associated to a sense of strong liking or profound oneness. The meaning of love differs relative to context. Romantic love is seen as an inexpressible feeling of strong attraction shared in passionate or intimate attraction and intimate interpersonal and sexual relationships. Though often associated to personal relations, love is time and again given a wider connection, a love of humanity, with life itself, of nature, or an oneness with the universe, a worldwide love or karma. Love can as well be construed as Platonic love, familial love, religious love, and, more indifferently, great liking for anything measured strongly pleasurable, pleasing, or preferred, to include activities and foods. This diverse range of meanings in the outstanding word love is often contrasted with the plurality of Greek words for love, reflecting the concept's profundity, versatility, and complexity.

Sunday, July 08, 2007

Management information system

Management Information Systems (MIS) is a general name for the educational discipline casing the application of people, technologies, and procedures —together called information systems — to solve business problems. MIS are distinctive from normal information systems in that they are used to evaluate other information systems applied in operational activities in the organization. Rationally, the term is commonly used to refer to the group of information management methods attached to the automation or support of human decision making, e.g. Decision Support Systems, Expert systems, and Executive information system

Tuesday, July 03, 2007

Accumulator

In a computer CPU, an accumulator is a register in which intermediary arithmetic and logic results are stored. Without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to main memory, possibly only to be read right back again for use in the next operation. Access to main memory is slower than access to a register like the accumulator because the technology used for the huge main memory is slower (but cheaper) than that used for a register.

The canonical example for accumulator use is adding a list of numbers. The accumulator is initially set to zero, then each number in spin is added to the value in the accumulator. Only when all numbers have been added is the result seized in the accumulator written to main memory or to another, non-accumulator, CPU register.