biocompatible materials or non-toxic materials. Usually‚ the casing along with the lead is made of titanium or titanium alloy‚ but the lead is further insulated by a polymer. The circuitry or all the electrical wires are usually made of modified silicon semiconductors and the battery used in a pacemaker is commonly a lithium-ion battery.
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Physics GCSE coursework: Resistance of wire Aim: To investigate if the length of wire affects its resistance. Prediction (Hypothesis): I predict that the longer the wire the higher the resistance‚ and the shorter the wire the lower the resistance. Knowledge: Resistance is that property of electric components that turn electric energy into heat in opposing the passing of an electric current.It can be beneficial‚ as in electric heaters‚ or a pest‚ as in light bulbs‚ where the heat
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A brief report of Information Technology in UAE Industry Brief & Business Environment The IT industry in the UAE is a thriving one‚ with figures showing growth for the region and its industry for the next decade. Growth in this market can be attributed to the rising real estate prices and growth of the tourism sector that will help sustain demand for IT products and services in the future. IT spending remains vibrant‚ with the market expected to register around 13 per cent growth to $7.3
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in measuring either the carrier density or the magnetic field. HALL EFFECT IN SEMICONDUCTORS A static magnetic field has no effect on a charged particle unless it is moving. When charges flow‚ a mutually perpendicular force (Lorentz force) is induced on the charge.[1] A Hall voltage Vhall will measured perpendicular to B and
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Chemical Prperties of Metals Most metals are chemically reactive‚ reacting with oxygen in the air to form oxides over changing timescales (for example iron rusts over years and potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals‚ found in the leftmost two groups of the periodic table. Examples: 4Na + O2 → 2Na2O (sodium oxide) 2Ca + O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to
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A light-emitting diode (LED) is a semiconductor light source.[6] LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Appearing as practical electronic components in 1962‚[7] early LEDs emitted low-intensity red light‚ but modern versions are available across the visible‚ ultraviolet‚ and infrared wavelengths‚ with very high brightness. When a light-emitting diode is switched on‚ electrons are able to recombine with holes within the device‚ releasing energy
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Nanoelectronics: fig no:1 nanoelectronics Nanoelectronics are sometimes considered as disruptive technology because present candidates are significantly different from traditional transistors. Some of these candidates include: hybrid molecular/semiconductor electronics‚ one dimensional nanotubes/nanowires‚ or advanced molecular electronics. The sub-voltage and deep-sub-voltage nanoelectronics are specific and important fields of R&D‚ and the appearance of new ICs operating near theoretical limit (fundamental
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field. (a) Superconductors (b) Semiconductors (c) Magnetic field (d) None of the above 4. -----------------are used in heating elements‚ precision instruments‚ incandescent lamps‚ and motor starters. (a) Low Resistivity Materials (6) Medium Resistivity Materials (c) High Resistivity Materials (d) None of the above 5. Mercury as a ________ contact material is a metal liquid. (a) an Electric (b) metallic (c) liquid (d) gas 6. -------------- is not a Semiconductor.
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of their sales revenue in new plants and equipments. Moreover‚ the Japanese firms had an important technological advantage in photolithography. They also worked closely with equipment manufacturers‚ which allowed them to get better yields for semiconductors regarding the US firms (i.e 70% to 80 %‚ against 50% to 60%). By the early 1990s‚ Japanese firms had captured nearly half of the world market for DRAMs and consequently Intel lost significant market share in DRAM’s. Intel did not change their
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diode. In fact many of the early devices were made in the same way as a point-contact diode‚ although today’s devices are made with totally different manufacturing techniques. Unlike conventional semiconductor diodes‚ which consist of a PN junction‚ the Schottky diode is made from a metal semiconductor junction. This offers a number of advantages in some circumstances as the diode has a very low forward-voltage drop‚ and secondly it has a very fast switching speed. Both of these properties make
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