In the history of flight‚ the first lighter-than-air balloon (1783) and the first powered aircraft (1903) are very recent when compared with the age of kites. The exact date and origin of the kite is not known but it is believed that they were flown in China more than two thousand years ago. One legend suggests that when a Chinese farmer tied a string to his hat to keep it from blowing away in a strong wind‚ the first kite was born. The earliest written account of kite flying was about 200 B.C
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RENEWABLE ENERGY RESOURCES ABSTRACT The electricity requirements of the world including India are increasing at alarming rate and the power demand has been running ahead of supply. It is also now widely recognized that the fossil fuels (i.e.‚ coal‚ petroleum and natural gas) and other conventional resources‚ presently being used for generation of electrical energy‚ may not be either sufficient or suitable to keep pace with ever increasing demand of the electrical energy
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IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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Nuclear Disasters and Accidents Introduction: One of the scariest things about nuclear power is when something goes wrong and an accident occurs. Radiation is released into the environment and people get hurt. Two of the most famous nuclear accidents occurred at the Three Mile Island reactor 2 in the United States and the Chernobyl reactor 4 in the former Soviet Union. In this text we will discuss these two disasters‚ along with correcting a few common misconceptions about nuclear accidents. The
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Chapter 9 The World of Plastics and Polymers Overview • Plastics are all around us – Polymers‚ materials whose molecules consist of long chain of atoms • Natural • Synthetic • Use of material and impact on economy‚ lifestyle‚ and leisure – Word plastic to some carry connotation “cheap” or “tacky” – Synthetic polymers revolutionised modern life • eg plastics become important in automobile industry‚ some new plastics stronger than steel and resist corrosion‚ less dense than structural
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The Eurasia Center 1800 Connecticut Ave. NW Washington‚ DC 20009 www.eurasiacenter.org Email: Eurasiacenter1@cs.com South Korea: Environmental Overview Push for a Cleaner Future: South Korea’s rapid industrialization led to tremendous wealth for the country. However‚ development has also led to an increase in pollution‚ and in 2001‚ South Korea was in the top ten in terms of carbon emissions.[1] Determined to turn this trend around‚ South Korea has launched a new framework
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The Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence number of 3. The element has 3 energy levels. Chlorine exists as a greenish-yellow gas at normal temperatures and pressures. Chlorine is second in reactivity only to fluorine among the halogen elements. Chlorine is a nonmetal. It is estimated that 0.045% of the earth’s crust and 1.9% of sea water are chlorine.
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Ken Kesey’s use of symbolism in One Flew Over the Cuckoo’s Nest transforms the novel and the hospital within the novel a microcosm of society‚ a battle between the sane and insane‚ the conformist and the non-conformist. Randle McMurphy’s arrival influenced the lives of almost every person‚ whether patient or employee. Whether or not his motives and actions were moral or good-hearted is difficult to conclude‚ however. On one hand‚ he undoubtedly saved the patients from losing their souls‚ so to
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chemical compounds whose molecules contain carbon. For historical reasons discussed below‚ a few types of carbon-containing compounds such as carbonates‚ simple oxides of carbon and cyanides‚ as well as the allotropes of carbon such as diamond and graphite‚ are considered inorganic. The distinction between "organic" and "inorganic" carbon compounds‚ while "useful in organizing the vast subject of chemistry... is somewhat arbitrary".[1] Organic chemistry is the science concerned with all aspects
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Nuclear Energy Overview: The Basics of Nuclear Energy — An Overview Nuclear power uses the energy created by controlled nuclear reactions to produce electricity. Fission Nuclear Fission Source: Atomicarchive.com at: http://www.atomicarchive.com/Fission/Fission1.shtml The most commonly used nuclear reaction for power generation is nuclear fission. Nuclear fission is the splitting of an atom’s nucleus into parts (lighter nuclei that are different from the parent and neutrons) by capturing
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