II. For my project I used Styrofoam‚ tinfoil‚ insulation‚ silicone‚ and a cork. I used the Styrofoam as a box to put the can in and the Styrofoam also acts as a thermal insulation. I used the tin foil because it serves as an insulator and keeps the radiant heat inside the box. Next I used insulation‚ which does what its name is‚ it keeps whatever inside of it insulated or prevents convection. I used silicone to block off the holes from the Styrofoam to make a good box for the
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11/24/2013 CLASSIFICATIONS of MATERIALS Semiconductor Theory a. Conductor b. Semiconductor c. Insulator • Number of valence electrons is 1-3 with very high conductivity • Number of valence electrons is 4 with intermediate conductivity • Number of valence electrons is 5-8 with very low conductivity Semiconductor Conductors • Has more electrons that are free to move • Supports charge carriers to flow • Support flow of electricity • Has very low resistance allowing
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What is an excition? What are key parameters to describe an exciton? An exciton is a bound state of an electron and a hole in an insulator (or semiconductor)‚ or in other words‚ a Coulomb correlated electron/hole pair. It is an elementary excitation of a solid. A vivid picture of exciton formation is as follows: a photon enters a semiconductor‚ exciting an electron from the valence band into the conduction band. The missing electron in the valence band leaves a hole behind‚ of opposite electric
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V (OPTIONAL) Micrometer (OPTIONAL) Modern dry cell construction uses a steel can connected to the positive (raised) contact. The negative connection is the centre of the base with an annular ring of insulator between it and the can. Some cell holders have clips which can bridge the insulator causing a ’short circuit’. This discharges the cell rapidly and can make it explode. The risk is reduced by using ’low power’‚ zinc chloride cells not ’high power’‚ alkaline manganese ones. When using
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of atom (acceptor) to the semiconductor in order to increase the number of free charge carriers (in this case positive holes). Band Theory Metals and semiconductors have a unique property that separates them from non-conductive insulators. In metals and insulators‚ the difference between energy orbitals are so small that electrons can be excited from lower energy orbitals to higher energy levels. These small orbital energy differences are referred to as bands. Unlike the discrete energy levels
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it charges and discharges much more efficiently. Also‚ unlike a battery‚ a capacitor does not produce electrons; it only stores them. A basic capacitor is made up of two conductors on which equal but opposite electric charges are placed‚ and an insulator‚ which is also called a dielectric‚ separates the two conductors. This dielectric could be made of paper‚ plastic‚ mica‚ ceramic‚ glass‚ or almost any other nonconductive material. Because each conductor stores an equal but opposite charge‚ the
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ELECTRO-CERAMICS AND STRUCTURAL CERAMICS NAME : RIFAD M.Z.M INDEX NO : 100835N FIELD : EARTH RESOURCES DATE OF SUB : 03-11-2011 ELECTRO-CERAMICS The term Electro-ceramic is used to describe ceramic materials that have been specially formulated for specific
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5 Gas Cycles Heat engine or thermal engine is a closed system (no mass crosses its boundaries)that exchanges only heat and work with its surrounding and that operates in cycles. Elements of a thermodynamic heat engine with a fluid as the working substance: 1. A working substance‚ matter that receives heat‚ rejects heat‚ and does work; 2. A source of heat (also called a hot body‚ a heat reservoir‚ or just source)‚ from which the working substance receives heat; 3. A heat
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www.topperlearning.com 2 6. Type of Solid Molecular solids 1. Non polar 2. Polar 3. Hydrogen bonded Ionic solids Ions Dipole-dipole interactions Hydrogen bonding Coulombic or electrostatic HCl‚ solid SO2‚ solid NH3 H2O (ice) Soft Hard Insulator Insulator Low Low Types of crystalline solids: Constituen t Particles Molecules Bonding/ Attractive Forces Dispersion or London forces
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RAJASTHAN RAJYA VIDYUT PRASARAN NIGAM LTD. (Regd. Office: Vidyut Bhavan‚ Janpath‚ Jyoti Nagar‚ Jaipur–302005) CONSTRUCTION MANUAL FOR SUB STATIONS Last Updated : 31-1-2008 FOREWORD The Engineers experienced in the field of Transmission have made this effort to compile the experience gained over the past 40 years in the form of a Manual and make it available to the Engineers and Technical Supervisors of the Company. This is a step forward to disseminate knowledge so that uniform practices
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