photovoltaic cells are non-mechanical devices‚ usually made of silicon‚ that absorb sunlight to create electricity. In a solar cell energy is absorbed as wavelengths of light. In the light spectrum wavelengths have various levels of energy. We see some of these wavelengths as different colors. Solar cells are manufactured to absorb only certain wavelengths in order to collect the most energy. When enough energy is absorbed by the silicon (or semiconductor)‚ it is dislodged from that material’s atoms
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Conductors A substance with electrical properties between those of a good conductor and those of a good insulator.They often produced by dopping. Intrinsic Semi Conductors Intrinsic semiconductors are composed of only one kind of material. Silicon and germanium are two examples. They are also called "undoped semiconductors" or "i-type semiconductors". Extrinsic Semi Conductors Extrinsic semiconductors are made of intrinsic semiconductors that have had other substances added to them to alter
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PIRATES OF SILICON VALLEY The film was a great watch especially for techno-geeks like me. Not that I have each and every gadget ever made by man‚ but we can say that I am easily amazed and curious about a lot of things including computers and such. Pirates of Silicon Valley shows a part of the history of computers‚ how it develops‚ and a part of the rivalry between the two main competitors of this age‚ Apple and Microsoft. The film shows how Steve Jobs of Apple Computers is easily deceived
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the latest technology for converting sunlight into electricity could make solar panels cheap and efficient enough to become a widespread source of domestic power. New Scientist 178(2398)‚ 14(2). Business Wire. (2004‚ January 28). SunPower ’s A-300 silicon solar cell named product of the year by analogZONE; Unique high-efficiency product selected for award in the ’ ’Green Technology ’ ’ category. Business wire. Winters‚ Jeffrey. (2003‚ July). Roll out the solar. Mechanical Engineering-CIME 125(7)‚
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Carbon Nanotubes Abstract Carbon nanotubes (CNTs) are a recently discovered allotrope of carbon. They take the form of cylindrical carbon molecules and have novel properties that make them potentially useful in a wide variety of applications in nanotechnology‚ electronics‚ optics‚ and other fields of materials science. They exhibit extraordinary strength and unique electrical properties‚ and are efficient conductors of heat. Inorganic nanotubes have also been synthesized. A nanotube is a member
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2.1 DEFINITION OF MICROCHIP According to the Microsoft Encarta Dictionary‚ “Microchips are small wafer of semiconductor materials‚ usually silicon‚ forming the base on which an integrated circuit is laid out‚ or such a wafer together with its integrated circuit”. It is a tiny silicon component made for incorporation into devices for increased functionality. 2.2 DESCRIPTION Several types of microchips are made today. Microprocessors are logic chips that perform the computations inside most commercial
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dioxide by combining it with hydrogen to form carbohydrates‚ this process is referred to as carbon fixation (Hoefnagels‚ 2012‚ p.98). In 2011‚ drawing inspiration from the light reactions of photosynthesis‚ Dr. Nocera developed the “artificial leaf”‚ a silicon coated sheet that is about the size of a playing card. When placed in water and exposed to sunlight the leaf splits water into hydrogen gas and oxygen gas‚ the gas can then be collected and used as fuel. Dr. Nocera’s process of “artificial photosynthesis”
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What are the risks of an extended supply chain? In order to remain competitive‚ a company must offer superior quality goods or services at the lowest prices possible. Supply chain enables a company to reduce the cost while increasing the efficiency. However‚ there are risks that are associated with such benefits. These issues should be properly addressed when a company is trying to rely heavily on supply chain management in order to stay competitive within its industry. A company is exposed
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primaries are inexpensive but suffer from color ghosting problems with eye movements‚ and three-chip versions are very expensive; worse‚ there are control issues with both DLP types. A newer technology that offers much promise is the Liquid Crystal On Silicon (LCOS) display‚ based upon a reflective rather than transmissive liquid crystal. Here we characterize a particular LCOS projector‚ the JVC DLA-SX21‚ in terms of its suitability as a display for vision research. Built into a simple rear-projection
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available‚ facilitating the design of complementary-symmetry circuits‚ something not possible with vacuum tubes. * Insensitivity to mechanical shock and vibration‚ thus avoiding the problem of microphonics in audio applications. Limitations * Silicon transistors do not operate at voltages higher than about
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