1779 Microcontroller-Based High-Power-Factor Electronic Ballast to Supply Metal Halide Lamps Marco Antonio Dalla Costa‚ Member‚ IEEE‚ José Marcos Alonso Álvarez‚ Senior Member‚ IEEE‚ Jorge García‚ Member‚ IEEE‚ André Luís Kirsten‚ Associate Member‚ IEEE‚ and David Gacio Vaquero‚ Student Member‚ IEEE Abstract—The analysis‚ design‚ and implementation of a microcontroller-based electronic ballast to supply metal halide (MH) lamps are presented. The proposed topology is based on the integration
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School of Chemistry @ Pietermaritzburg University of KwaZulu Natal Chemistry 310 Substitution reaction of Molybdenum Hexacarbonyl: the use of infrared spectroscopy as a structural tool in metal carbonyl chemistry. Abstract The synthesis of isomer A and B of [Mo(CO)4(PPh3)2] were prepared from molybdenum hexacarbonyl‚ sodium borohydride and triphenylphosphine with a % yield of 79% and 8.5% respectively. Two isomer was identified using IR spectra and from isomer A four C≡O stretching
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AN INVESTIGATION INTO FULLY MELTING A MARAGING STEEL USING DIRECT METAL LASER SINTERING (DMLS) Mark. Stanford‚ Kevin. Kibble‚ Matthew. Lindop‚ Diane. Mynors and Colin. Durnall Department of Engineering and Technology University of Wolverhampton Shifnal Road‚ Priorslee Telford‚ UK TF2 9NT ABSTRACT This paper reports on the relative capability of the EOS M250 Extended platform to fully melt an 18Ni (‘300’ grade) maraging tool steel from sub-20 µm powder. The work describes the
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Title: Investigating the current - potential difference relationship for a metal wire. Aim: To design an experiment that will facilitate an I - V Graph to be ascertained of a metal wire and thus find the resistance of the wire by deriving the inverse of the gradient of the graph. Skill: Planning & Designing Theory: Resistance is a property of any object or substance to resist or oppose the flow of an electrical current. The quantity of resistance in an electric circuit determines the amount of current
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controversial music genre‚ heavy metal music has made a strong influence on American culture and the mass media. While heavy metal‘s popularity has increased‚ a growing number of fans have established a new youth subculture and devoted themselves into it. In the article “Heavy Metal Music: A New Subculture in American Society”‚ Robert L. Gross introduces the heavy metal music and its subculture. He organizes his article in a good way in that he examines five aspects of heavy metal music and the subculture
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“Effect of Heavy Metal- Lead Nitrate; on Germination‚ Early Growth & SDH activity of Mustard & Mung Bean” By: Reuben David Department of Biotechnology Loyola Academy Degree & P.G. College Accredited with the ‘A’ Grade by the NAAC A College with Potential for Excellence by UGC Affiliated with Osmania University Old Alwal‚ Secunderabad-10 2009 “Effect of Heavy Metal- Lead Nitrate; on Germination‚ Early Growth & SDH activity of Mustard & Mung Bean” By: Reuben David (06-1821)
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Aim: To range the metals copper‚ lead‚ silver and zinc together with hydrogen. Start with the strongest reducing agent. Hypothesis: The nobler a metal is‚ the worse reducing agent. Apparatus/requirements: Sandpaper‚ strips of; zinc‚ lead‚ silver and copper‚ solutions containing aqueous; Zn2+‚ Pb2+‚ Cu2+ and Ag+ ions (0.2 M)‚ hydrochloric acid (5.0 M)‚ emery paper‚ test-tubes. Method: Burnish the three metal strips to get a shiny surface‚ after drop a drop of each of the metal ion solutions on
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Combined Tension and Bending Loading in Bottom Chord Splice Joints of Metal-Plate-Connected Wood Trusses by Philip J. O’Regan Thesis submitted to the Faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE in Biological Systems Engineering APPROVED: Frank E. Woeste‚ Chairman Joseph R. Loferski Audrey G. Zink John V. Perumpral May‚ 1997 Blacksburg‚ Virginia Keywords: wood truss‚ combined
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Sponsored by the American Welding Society and the Welding Research Council Simulation of Weld Pool Dynamics in the Stationary Pulsed Gas Metal Arc Welding Process and Final Weld Shape A computer simulation accurately predicts weld pool fluid flow convection and final weld shape BY M. H. CHO‚ Y. C. LIM‚ AND D. F. FARSON ABSTRACT. The pulsed gas metal arc welding (GMAW-P) process was modeled numerically using a code based on the volume of fluid (VOF) technique‚ chosen primarily for its ability
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The yield of a metal from a particular mineral or ore is the mass of metal that can be obtained from a particular mass of the mineral or ore‚ and is often expressed as a percentage. It is possible to use formulae to calculate/predict yields of metals from particular minerals (pure compounds)‚ for ores we have to measure them experimentally. This is because ores are mixtures of the required mineral and unwanted material‚ and‚ being mixtures‚ they have variable composition. Measurement of the yield
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