Wednesday, 1 April 2015
Types Of Computer
Central unit and personal computers
The modern general purpose personal computers have always UNIA Central. And because, thanks to the advent of microelectronics, today the level of integration of logical and functional components of the computer is very high (so hardly the processing unit that oversees all the functionality of the computer is a hardware lock him). And because, even when all the main hardware components of the personal computer constituting a single block, the personal computer is always equipped with several ports for connecting external devices (such as the printing unit, the disk drive, the modem, etc.) optional (ie not included in the sales package of the personal computer).
Central unit and desktop computer
In desktop computers the central unit includes most of the major components of the logical-functional computer and the power supply. Excluded external devices not essential to the operation of the computer such as the printer or monitor audio. If the computer is not a computer all-in-one, the central unit does not include either the main user interface output, the display, which is inserted in a separate block: the video monitor. If it is an all-in-one computer, the display is also included in the central unit. The main user interface input, the keyboard, it can either be a separate block, is to be included in the central unit (such as in the home computer). The mouse instead always constitutes a separate block.
CPU and notebook computer
The central unit (left) and the hard disk (right) of a notebook computer
In the notebook computer the central unit includes all major computer hardware. In such computer is referred to as central unit only as a consequence of the fact that they are always equipped with several ports for connecting external devices (usually optional). The central unit is also equipped with autonomous power supply thanks to rechargeable electric batteries integrated in the central unit. In the box of the sale of the notebook computer, usually also includes a power supply. The power supply is a hardware block separate from the main unit and allows, if connected to the mains, supplying power to the computer when the battery power is low, as well as to recharge these batteries.
Central unit and tablet computer
Even in the tablet computer the central unit includes all major computer hardware.
Sunday, 29 March 2015
Email Management
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Infrared Radiation
In physics, the infrared radiation (IR) is electromagnetic radiation with a frequency band of the electromagnetic spectrum than that of visible light, but greater than that of radio waves, or a wavelength between 700 nm and 1 mm (infrared band) .
The term means "below red" because red is the color visible with the lowest frequency.
It is often associated with the concepts of "heat" and "heat radiation" because every object with a temperature above absolute zero (basically any real object) spontaneously emits radiation in this band (for the Wien law increasing the temperature peak emission moves more and more towards the visible until the object becomes incandescent).
Thursday, 12 March 2015
Li-Fi Technology
Li-Fi is the term used to label the wireless communications systems fast and inexpensive, the optical equivalent to Wi-Fi.1 The word Li-fi was indexed by Harald Haas in a lecture at TED on light communication visible.2
The technology was shown at the Consumer Electronics Show in 2012 using a pair of smartphones Casio to exchange data by varying the intensity of light from their screens, operating at peak separation ten metros.3
In October 2011, an association of industries and groups of companies formed the Li-Fi Consortium to promote wireless high-speed optical systems and overcome the limitations of the radio spectrum by exploiting a completely different part of the electromagnetic spectrum. The consortium expects him to reach speeds of more than 10 Gbps, theoretically enabling a high definition movie to be downloaded in 30 sec.
Li-Fi has the advantage of not causing interference with other systems and can be used in sensitive areas like the inside of an airplane. However, the light waves can not penetrate used paredes.5
Introduction To Usb
The first models require a battery, but current use electricity from the USB port. These memories are resistant to scratches (external), dust, and some even water, factors affecting previous forms of portable storage, such as floppy disks, CDs and DVDs.
Its success and dissemination have led them several popular names related to its small size and the various forms of presentation, none has been able to stand out from all of them. The USB itself adjective or context can easily identify the computing device to which it relates; although being a little strict on the concept refers only USB port connection.
These reports have become the storage system and personnel data transport most used in this application displacing traditional diskettes and CD. You can easily find on the market memories 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 GB, and up to 1 TB.2 memories with higher capacities may still be, for its price, outside the range of "domestic consumer." This means at least equivalent to 180 CDs or 700 MB diskette approximately 91 000 1440 KiB.
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