The Bluetooth technology offers wireless access to LANs, PSTN, Mobile network and portable handheld devices. The Bluetooth enabled devices communicate wirelessly through short range network called”Piconets”. The Piconets establish connection with the Bluetooth automatically as the Bluetooth device enters the proximity of the radio communication. The technology of Bluetooth was named after Harald Blaatand Bluetooth II, the king of Denmark.
Holography is the “lens less” photography in which a 3-D image is created using laser beam. The recorded image is called Hologram (in Greek, Holos means ‘Whole’ and Gram the ‘message’). Holography was developed in 1947 based on the theory of Dennis Gabor. Hologram stickers are now widely used in commercial products and documents to prove authenticity.
Most of the sound generated by the human voice organ can be understood by the fellow humans. We produce sound to express emotion, mental imagery, and language. Human voice is the most natural form of communication involved with environmental and situational reality. Actually a spoken word has more meaning than its explanation in the dictionary.
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Tonometry is a Medical technology used to measure the Ocular pressure. Tonometer is the instrument used in Ophthalmology for measuring the tension or intraocular pressure. Intraocular pressure is the pressure exerted by the fluid present in the eye. The pressure is determined in terms of milli meters of mercury (mmHg)
The name Earth Leakage Circuit Breaker(ELCB) was given to a device that breaks the power supply when a fixed amount of current ,say 25-40 milli amperes flow through the earth line. The MCB (Miniature Circuit Breaker) is a device designed to protect a circuit’s wiring from the serious damage which would be caused if it has to carry a current which is too high for the diameter of its wires. The ELCB is now called as Ground Fault Circuit Interrupter (GFCI).
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