Technical Handbook Friction Stir Welding Contents page Introduction Process principles Weldable alloys Process characteristics Welding parameters Tools Design principles Tools for steels Retractable pin tool Bobbin tool Process speed Aluminium Application areas Aerospace Space industry Civil aviation Aerospace R&D Shipbuilding Application advances Parts and components Automotive industry Automotive applications Tailor welded blanks (TWB´s) Superplastic forming Extruders and extrusions – with
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Chapter 21 A. The Toltec and the Mexica 1. Toltecs emerge in the ninth and tenth centuries after the collapse of Teotihuacan a. Established large state‚ powerful army mid-tenth to the mid-twelfth century b. Tula was the Toltec capital city and center of trade c. Maintained close relations with societies of the Gulf coast and the Maya 2. Toltec decline after twelfth century d. Civil strife at Tula‚ beginning in 1125
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A. According to some archaeologists‚ the ancient civilization of Mesopotamia had its first settlements dating back since 10‚000 BCE. Due to this‚ it is considered as one of the birthplace of civilizations. Mesopotamia was also known as “the country between two rivers.” (Chilvers‚ 2007) These two rivers that surrounded this fertile land were the Tigris and the Euphrates. I believe that both rivers were one of the significant environmental factors that contributed to the development of the ancient
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Research Project: Potato The potato originated in the South American Andes‚ but its heartland of wild genetic diversity reaches from Venezuela‚ Colombia‚ Ecuador‚ Peru‚ Bolivia‚ Argentina‚ Chile‚ Uruguay‚ Paraguay‚ southern Brazil‚ northward into Central America‚ Mexico‚ and the southwestern United States. Potato was first cultivated between 3 and 7 thousand years ago‚ some scientists believe they may have grown wild in the region as long as 13‚000 years ago. Potato is the third most important
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According to source two Historic Sanctuary of Machu Picchu‚ as the last stronghold of the incas and superb architectural and archeological importance‚ Machu Picchu is one of the most important cultural sites in latin america‚ the stonework of this site remains as one of the world’s great examples of the use of natural raw material to provide
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“Our America” Jose Marti The essay “Our America” by Jose Marti is a magnificent work in which it encourage Latin America to realize that the human being is intelligent‚ wise and natural that tends to be mortified by the world. The world in this case North America and Europe‚ in their eagerness to conquer‚ they completely forget that Latin America is human beings of thought and ideals of our nature. Jose Marti tries to liberate Latin America from the oppression of the conquerors. He encourages
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the Aztecs convert‚ they believed that they were saving the Aztecs souls‚ so they could go to heaven and not endure hell. While Columbus and Cortes were converting the Aztecs and Native Americans‚ Francisco Pizarro was tackling the Incas. Pizarro’s men massacred the Incas and the ones that were saved were forced to convert to Christianity after Atahualpa was murdered. Many different explorers all had the same goal‚ convert the natives. As well as forcing Christianity onto the indigenous people‚ they
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1. How did humans come to settle in all parts of the Americas and in Oceania? The first large wave of migration from Siberia to Alaska but small numbers of migrants crossed the Bering land bridge by watercraft‚ sailing or drifting with the currents from NE Asia down the west coast of North America. By 9500 BCE they had reached the southernmost part of South America. At least 60‚000 years before the present human migrants entered Australia and New Guinea via watercraft – rafts or canoes fitted with
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This experience in battle was what let them butcher the Moriori people‚ who had no reason to fight with other groups‚ and no experience with war. They were also behind in technology‚ because everyone was hunting or gathering‚ instead of researching and building. The Incas and the Moriori are two prime examples of where Diamond’s theory explains why things turned out how they did. Some of the many flaws in Diamond’s argument are pointed out by J.R. McNeill‚ in his short essay‚ “The World According To Jared Diamond”
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Deep Tradition Rooted in the Black Hills The Native American Indians and the white settlers that eventually kicked the Indians off their lands quite obviously did not share the same idea of what it meant to own an area of land. The Native Americans viewed the land that they lived on as sacred‚ spiritual‚ even religious. The white settlers who forced them away from their homes‚ however‚ did not have this same concept of the land that they chose to live on; these people viewed land as a way to make
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