Friday, April 27, 2007

Information Technology

Information technology (IT) is the study, design, development, implementation, support or administration of computer-based information systems, particularly software applications and computer hardware. In short, IT deals with the use of electronic computers and computer software to transfer, store, protect, process, transmit and get back information, securely.

In this definition, the term "information" can frequently be replaced by "data" without loss of meaning. Recently it has become popular to widen the term to explicitly consist of the field of electronic communication so that people tend to use the abbreviation ICT (Information and Communication Technology). Strictly speaking, this name contains some redundancy.

Today, the term Information Technology has distended to encompass many aspects of computing and technology, and the term is more identifiable than ever before. The Information Technology umbrella can be quite large, covering many fields. IT professionals achieve a variety of duties that range from installing applications to designing complex computer networks and information databases.

Tuesday, April 24, 2007

Imperial Airways

Imperial Airways was an early on British saleable air transport company, in service from 1924 to 1939.

Created subsequent the advice of the government Humbling Committee in 1923 — that the main existing aircraft companies should be merged to create a company which would be physically powerful enough to develop Britain's external air services — and offered a £1m subsidy over ten years if they merged. Imperial Airways Limited was formed in March 1924 from the British Marine Air Navigation Company Ltd, the Daimler Airway, Handley-Page Transport Ltd and the Intone Air Line Ltd. The land operations were based at Corydon Airport.

The first commercial flight was in April 1924, when a daily London-Paris examines was opened. Additional services to other European destinations were started all through the summer. The first new airliner was specially made by Imperial Airways in November 1924. In the first year of operation the company carried 11,395 passengers and 212,380 letters.

The porch of service to the British Empire was not begun until 1927 when, with the addition of six new aircraft, a service was instituted from Cairo to Basra. But the first service from London for Karachi did not start until 1929 using newly purchased Short S.8 Calcutta flying boats; even then the passengers were transported by train from Paris to the Mediterranean where the Short flying boats were. In February 1931 a weekly service between London and Tanganyika was started as part of the proposed route to Cape Town and in April an investigational London-Australia air mail flight took place; the mail was transferred at the Netherlands East Indies, and took 26 days in total to reach Sydney. The purchase of the 8 Handley Page 42 four-engine airliners boosted the series of services; in 1932 the service to Africa was extensive to Cape Town.

Wednesday, April 18, 2007

Camera phone

A camera phone is a cellphone which has a camera built in. The world's first camera phone was the J-SH04 made by Sharp Corporation and put on market from J-Phone (Vodafone) in Japan in November 2000. The cameras characteristically use CMOS image sensors. This is due mainly to reduced power consumption compared to CCD type cameras, which are also used. The lower power consumption prevents the camera from quickly depleting the phone's battery. Major manufacturers include Nokia, Samsung, Motorola, Siemens, Sony Ericsson, and LG Electronics. As of 2004, the resolution in Japan is classically in the megapixel range such as 2 megapixels, while in North America and Europe 0.3 megapixels (VGA) is most common. In 2004, 60% percent of mobile phones in Japan have built-in cameras, and this is predictable to rise in 2005. Previously, the highest resolution available was 7 megapixels on the Samsung SCH-V770. This has since been replaced as Samsung Electronics unveiled the world's first 8.0 megapixel camera phone, the WCDMA SPH-V8200.As a network-connected device, megapixel camera phones are initial to play significant roles such as crime prevention, journalism and business applications as well as individual uses. On the other hand, they are prone to abuse such as voyeurism and invasion of privacy.

Sunday, April 08, 2007

Monday, April 02, 2007

Light

Light is electromagnetic radiation with a wavelength that is able to be seen to the eye or, in a technical or scientific setting, electromagnetic radiation of any wavelength. The three basic dimensions of are:

Intensity (or brilliance or amplitude, professed by humans as the glow of the light),
Frequency (or wavelength, apparent by humans as the color of the light), and
Polarization (or angle of shaking and not audible by humans under ordinary circumstances)
Due to wave-particle duality, light at the same time exhibits properties of both waves and particles. The exact nature of light is one of the key questions of modern physics.

Visible electromagnetic radiation

Visible light is the piece of the electromagnetic spectrum between the frequencies of 380 THz and 750 THz. The speed, frequency, and wavelength of a wave obey the relation:

Because the speed of light in a vacuum is fixed, able to be seen light can also be characterized by its wavelength of between 400 nanometers and 800 nm.

Speed of light
Main article: velocity of light
Even though some people express of the "velocity of light", the word velocity should be kept back for vector quantities, that is, those with both magnitude and way. The speed of light is a scalar quantity, having only magnitude and no direction, and therefore speed is the correct term.

The speed of light has been measured many times, by many physicists. The best early measurement is Ole Rømer's, in 1676. By observing the motions of Jupiter and one of its moons, Io, with a get smaller, and noting discrepancies in the apparent period of Io's orbit, Rømer calculated a speed of 227,000 kilometers per second.