Guess Paper – 2009 Class – XII Subject –Chemistry : Solid State (Q.1) The appearance of colour in solid alkali metal halides is generally due to: ( 1 mark ) (a) Frenkel defect(b) Interstitial positions(c) F-centres(d) Schottky effect (Q.2) Schottky defects in crystal is observed when ( 1 mark ) (a) unequal number of cations and anions aremissing from the lattice(b) equal number of cations and anions are missing from the lattice(c) an ion leaves its normal siteand occupies an interstitial
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Semiconductor manufacturing processes are very costly and complex. Every stage of the semiconductor in the supply chain can be ordered by customers. In addition‚ processing of semiconductors is very time consuming and therefore it is very hard to satisfy demands with different amplitude and priorities. Ordinary optimization methods are not best suited for this industry and will be explained below. To understand the IBM central planning engine (CPE) model‚ two essential knowledge must first be obtained
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and further develop our market share. The semiconductor market in business communication is expected to have a compound average growth rate of almost 18% over the next five years. Our current market share within this segment is slightly more than 7%‚ and management wants to see the share of the market double by the end of the century. Figure 1 represents the projected growth of the semiconductor market in business communication and Mitel Semiconductor over the next five years. [pic] In order
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Kilby. In 1974 a basic patent for miniature electronic calculators has been issued to Texas Instruments Incorporated. The patent is for personal-sized‚ battery-operated calculators which have their main electronic circuitry in a single integrated semiconductor circuit array‚ such as the popular "one-chip" calculators. | | This represents another in a series of landmark developments at Texas Instruments directly relating to miniature calculators. In 1958‚ Texas Instruments
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Samsung started its business back in 1938‚ as an agricultural product producer. In 1969‚ Samsung became a low cost black and white TV manufacturer‚ known as Samsung Electronics Company (SEC). To support for its growing business‚ Samsung acquired a semiconductor business‚ and was set for a future in electronics business. During this period‚ Samsung focused on R&D‚ and supply chain to improve the quality of its products. In 1997‚ during the Asian financial crisis‚ SEC had a negative net income forcing
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CHAPTER 13 SEMICONDUCTOR LASERS Pamela L. Derry Luis Figueroa Chi-Shain Hong Boeing Defense & Space Group Seattle ‚ Washington 13.1 GLOSSARY A C c D Dc D d deff dG dg / dN E Ec Eg En E cn En E e Fc F fc fd fo fp Constant approximating the slope of gain versus current or carrier density Capacitance Speed of light Density of states for a transition Density of states for the conduction band Density of states for the valence band Active layer thickness Effective beam width in the transverse direction
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Today’s world is overrun by computers from the small to the big. These include the desktop that is in many homes to the cell phones in your pocket. Even things like your car‚ dishwasher‚ dvd player‚ and even TVs include some form of computers. All this would not be possible without the invention of the integrated circuit or IC. This led to the creation of the Microprocessor or CPU (central processing unit) which acts as the brain of the computer. To better help illustrate the function and need for
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Park is developing. At the start of the semiconductor industry in 1950‚ the population of Santa Clara County‚ the heart of Silicon Valley‚ was 3 million people. With the establishment of Stanford Industrial Park in the mid 50’s‚ the very character of Silicon Valley as a conglomeration of inter-related‚ interbred technology companies took hold. William Shockley founds a lab in 1956 who attracts some of America’s best young engineer. Fairchild Semiconductor company sells their first successful integrated
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survived two previous downturns still some outside believers believed that the Chinese entry would fundamentally change industry conditions in the years ahead. There has been a strong growth in economic importance of Semiconductor industry over the previous five decades. Semiconductor products were classified into two categories; Logic chips and memory chips. Logic chips were used for processing information/ control processes whereas Memory chips were further classified into DRAM (Dynamic Random Access
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master’s degree (1973) and Ph.D. (1975) in electrical engineering from Stanford University. While pursuing his Ph.D. degree‚ Rodgers invented the VMOS process technology‚ which he later licensed to American Microsystems‚ Inc. He founded Cypress Semiconductor in 1982. He was awarded an honorary doctorate from the Universidad Francisco Marroquín in Guatemala City. Rodgers received his bachelor’s degree from Dartmouth College in 1970‚ graduating as salutatorian with majors in chemistry and physics. He
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