A. VOLATILE MEMORY Volatile memory‚ also known as volatile storage‚ is computer memory that requires power to maintain the stored information‚ unlike non-volatile memory which does not require a maintained power supply. It has been less popularly known as term Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. Since real capacitors leak charge‚ the information eventually fades unless the capacitor
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Solder (/ˈsoʊldə/‚[1] /ˈsɒldə/[1] or in USA /ˈsɒdər/[2]) is a fusible metal alloy used to join together metal workpieces and having a melting point below that of the workpiece(s). Soft solder is typically thought of when solder or soldering is mentioned‚ with a typical melting range of 90 to 450 °C (190 to 840 °F).[3] It is commonly used in electronics‚ plumbing‚ and assembly of sheet metal parts. Manual soldering uses a soldering iron or soldering gun.Alloys that melt between 180 and 190 °C (360
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efficient and user-friendly. The region where more than 4‚000 high-tech industries got their start and still operate today was Silicon Valley. Many of these startup companies were Apple‚ Yahoo!‚ Hewlett-Packard‚ Cisco Systems‚ Adobe‚ eBay‚ and Google. So what better place was there for two young prodigies with an immense interest in computers than to meet in Silicon Valley? The first meeting of these two actually took in March 1995 during a tour of San Francisco that Stanford had arranged for
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Solar Energy 01-15-2014 Rebekah Layton Solar Energy‚ a type of energy not extracted from the ground‚ but instead‚ emitted by the sun. After driving its way through several layers of atmospheres to earth from about ninety-three million miles away‚ the land‚ water‚ and plants soak up about half of it while the other half makes its way back into space. This type of energy is unlike any other. It comes with significant benefits such as not costing money to obtain‚ causing
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electricity or fail to conduct electricity. However‚ there is a third type of material that is not a really good electrical conductor‚ and at the same time‚ is not really a great insulator either. These materials are called semiconductors‚ such as silicon and germanium (Trefil‚ p. 243). Semiconductors do carry electricity‚ but they have far greater resistance to the flow of electricity than do conductors. In fact‚ that resistance is actually millions of times more than one will measure in a good
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carbohydrate sugars. This electron transport chain is called a "Z-scheme". Yang and his colleagues also use a Z-scheme in their system only they deploy two Earth abundant and stable semiconductors‚ silicon and titanium oxide‚ loaded with co-catalysts and with an ohmic contact inserted between them. Silicon was used for the
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The newtons theroy of it should be trueDuring the first half of the 19th century‚ scientists such as John Herschel‚ Fox Talbot‚ and William Swan studied the spectra of different chemical elements in flames. Gradually‚ the idea that each element produces a set of characteristic emission lines was established. Each element has several prominent‚ and many lesser‚ emission lines in a characteristic pattern. Sodium‚ for example‚ has two prominent yellow lines (the so-called D lines) at 589.0 and 589.6
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Electrical Conductance and Insulation OVERVIEW: Every thing in the world is differentiable on the basis of its electrical conductance. Some things are called insulators and these substances never conduct electricity. they include things such as cold air‚wood and plastic. Then there are things that conduct electricity and current flows through them‚ they are called conductors. examples of conductors are most metals like copper and steel. Other materials that are sometimes used as conductors are
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A Zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode‚ but will also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage‚ "zener knee voltage"‚ "zener voltage" or "avalanche point". The device was named after Clarence Zener‚ who discovered this electrical property. Many diodes described as "zener" diodes rely instead on avalanche breakdown as the mechanism. Both types are
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introduced in Granovetter (2005)‚ write a brief (1-page) essay comparing his discussion of the Fur of Sudan and Arab merchants with the description in TechCrunch1 of the tech-funding needs in London and the arrival of Silicon Valley Bank. 1 http://techcrunch.com/2012/06/11/silicon-valley-bank-launches-in-london-to-bridge-the-tech-fundinggap/ 1 4. The goal of this exercise is to reproduce the results shown on slide 18 of lecture 3. On Yahoo Finance (http://finance.yahoo.com/) look up the SPDR
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