Dr. John Andraos‚ http://www.careerchem.com/NAMED/Elements-Discoverers.pdf 1 NAMES OF SCIENTISTS ASSOCIATED WITH DISCOVERIES OF ELEMENTS OF PERIODIC TABLE © Dr. John Andraos 2002 - 2005 Department of Chemistry‚ York University 4700 Keele Street‚ Toronto‚ ONTARIO M3J 1P3‚ CANADA For suggestions‚ corrections‚ additional information‚ and comments please send e-mails to jandraos@yorku.ca http://www.chem.yorku.ca/NAMED/ Z‚ Element Symbol Discoverer Dates Nationality Place
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reaction becomes self sustaining. If too many neutrons are generated‚ the reaction can get out of control and an explosion can occur. To prevent this from occurring‚ control rods that absorb the extra neutrons are interspersed with the fuel rods. Uranium-235 is the most commonly used fuel for fission. Nuclear fission can produce 200 MeV of energy. An Example of a Chain Reaction Source: Atomicarchive.com at: http://www.atomicarchive.com/Fission/Fission1.shtml Fusion Nuclear Fusion Source:
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Zirconium is a chemical element with the symbol Zr‚ atomic number 40 and atomic mass of 91.224. The name of zirconium is taken from the mineral zircon‚ the most important source of zirconium. It is a lustrous‚ grey-white‚ strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier‚ although minor amounts are used as alloying agent for its strong resistance to corrosion. Zirconium forms a variety of inorganic and organometallic compounds such as zirconium
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one in the United States Government had thought seriously about the menace of organized‚ international terrorism‚ much less nuclear terrorism.” Further investigation proved the possibility of nuclear materials such as plutonium or highly enriched uranium being attained by terrorists more and more plausible. By the Mid 1980’s Special Bulletin‚ a television dramatization of a nuclear terrorist attack on the United States had been aired by the NBC and "The
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Radiological Weapons as Means of Attack Anthony H. Cordesman Radiological weapons are generally felt to be suitable largely for terror‚ political‚ and area denial purposes‚ rather than mass killings. Unlike nuclear weapons‚ they spread radioactive material contaminating personnel‚ equipment‚ facilities‚ and terrain. The radioactive material acts as a toxic chemical to which exposure eventually proves harmful or fatal. Radiation is energy that comes from a source and travels through some material
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BHP billinton BHP billinton 1>Introduction BHP Billiton is one of the largest diversified mining and natural resources companies in the world. According to the data provided by Google Finance‚ BHP is worth nearly $174 billion as of September 4‚ 2009 (see bibliography‚ BHP Billiton (ADR)‚ Google Finance). The revenues earned by the group in the fiscal year ending June 2009 BHPre more than $50 billion (see bibliography‚ BHP Billiton Fundamentals‚ LondonStockExchange.com)‚ which is higher than
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Local protestors started anti-nuclear movements‚ concerned about the safety of the nuclear power plant‚ the possible threat of nuclear weapons‚ the international transport of uranium and its effect on the environment. These anti-nuclear movements grew into non-governmental organizations and emerging within several countries (Kalmbach). The discussions on nuclear energy were no longer within the field of the experts and the government
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Otto Hahn was a German chemist who revolutionized the field of nuclear chemistry. Following a lifelong interest in chemistry‚ he found himself on the forefront of radiochemistry research in the early 20th century. Through a series of chance discoveries‚ he and his fellow researchers brought radiochemistry out of the realm of theoretical research and into actual practical science. One of the practical uses of this research led to the development of nuclear weapons. While Otto Hahn’s lifetime of education
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research will answer to :the types of pollutions that are generated by the gold mining companies‚ pollution effect on the environment‚ governmental regulations that would address the pollution problem‚ role of NGO ’S (Non-governmental organizations) and citizens to reduce environmental effects
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count : 732 words Submission date : 14th April 2013 In this 21st era‚ mining sector had lead to rapid economics growth and improvement of social welfare in Australia (Kate Penney‚ et al.‚ 2012). As can be seen‚ between 2010 and 2011 roughly 85 percent out of the total commodities export in Australia was from mining sector (BREE‚ 2011). This condition has attracted investor overseas to come and invest in Australian mining company‚ especially on Rio Tinto. Before the investor made a decision‚ this
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