Extrusion is the process by which a block/billet of metal is reduced in cross section by forcing it to flow through a die orifice under high pressure. • In general‚ extrusion is used to produce cylindrical bars or hollow tubes or for the starting stock for drawn rod‚ cold extrusion or forged products. • Most metals are hot extruded due to large amount of forces required in extrusion. Complex shape can be extruded from the more readily extrudable metals such as aluminium. * The products obtained are also
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EXTRACTION OF METALS SUMMARY Most metals exist in compounds in rocks in the Earth’s crust. Many of these ores contain oxides or sulphides of the metals. The compounds need to be reduced to produce the metals as elements. Metals are very useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity
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Rosa Maldonado Vera Why did the USSR Collapse in 1991? In December of 1991‚ the Soviet Union broke down into fifteen separate countries. The west saw this collapse as a victory for freedom‚ a triumph of democracy over totalitarianism‚ and evidence of the superiority of capitalism over socialism. The United States were glad that its enemy was brought to its knees. The Cold War‚ which had confronted these two superpowers since the end of World War II‚ had ended. The breakup of the Soviet Union
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TERMS OF REFERENCE Mr L Neeson of the North Carolina Department of Transport requested this report. The report was needed to provide a progress update and likely outcomes on the investigation into an accident that took place on a bridge over Route 29 highway on 20th May 2000. Although privately owned‚ the bridge crosses a state highway and it is thus the responsibility of the North Carolina Department of Transport to ensure that a proper investigation into the accident is carried out. Mr. Neeson’s
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Trapped Suddenly‚ I realize that I am trapped in a nightmare. Standing in the doorway of a building‚ a rush of damp‚ misty air hits me. I study the open door and walk forward. The door slams shut behind me‚ locking me in. The air rings with a loud metallic bang as the door hits its frame. I turn to see the rattling door seal itself. It remains locked tight‚ allowing no one to pass through; it has trapped me in‚ and forbids me to walk out. Fear paralyzes my entire body‚ and I am unable to think
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SCI/220 Human Nutrition Week 5 August 17‚ 2010 I. Introduction II. Identify some common safety issues related to food purchase‚ storage and preparation. III. What is Food Safety IV. What criteria might the readers use to determine sources of credible nutritional information V. Conclusion Introduction Nutrition is the relationship of foods to the health of the human body. Proper nutrition means that you are receiving enough foods and supplements
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Running Head: PERSONALITY CHANGE Does personality undergo much change after age 30? Vuitton Bain 4137238 Brock University Psychology 2P25 Professor Ashton March 9th‚ 2008 Word Count: 1‚970 Over the last few decades‚ several studies were carried out to investigate whether or not personality undergoes a drastic change after the age of 30. During these investigations‚ many personality psychologists did studies to find out if any of their theories of changes in personality took place
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A Sequence of Chemical Reactions: Transforming Copper Briefly describe. a) Why must you carry out the oxidation of Cu with HNO3 in a fume hood? Concentrated nitric acid is a toxic oxidant. Avoiding skin contact or inhalation is highly important. The reaction between Cu and HNO3 produces NO2‚ a toxic brown gas; therefore working under the fume is necessary in order to prevent inhaling the toxic gas. b) Why you should be particularly careful when you work with 3 M H2SO4 solution? Sulfuric acid
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List of Chileans - Wikipedia‚ the free encyclopedia 16/12/13 2:15 PM List of Chileans From Wikipedia‚ the free encyclopedia This is a list of Chileans who are famous or notable. Contents 1 Economists 2 Military 3 Musicians 4 Artists 5 Politicians 6 Religious figures 7 Sports 8 Scientists and engineers 9 Film and television personalities 10 Writers 11 Others 12 See also Flag of Chile Coat of Arms Economists Hernán Büchi – Columbia University trained economist. Minister
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A REVIEW PAPER ON MINE FIRE IN INDIA INTRODUCTION The problem of mine fire is as old as the history of the mine. The fires in coal mines are posing great hazard due to its increasing trend in the world and much more so in our country while mining of thick and thin seams under difficult geo-mining conditions. Due to fires in underground as well as surface mines‚ not only a considerable amount of resources is lost‚ but the entire mine environment is badly affected. So long as the fires are restricted
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