... together. This type of bonding, that is, the electrostatic attractions between the delocalised electrons and the positive metal ions, is called metallic bonding. Solid metals are good conductors of electricity in both the solid and liquid states. In the solid state, conductivity decreases with increasing temperature. Metals are good conductors of heat in both the solid and liquid states. As ... , the positive ions do not act as charge carriers. They remain vibrating about fixed positions within the lattice, as the delocalised electron move. However, when a molten metal conducts electricit...

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• Grade Level: Undergraduate

... are some alternatives to getting power, but the problem is the cost of building these alternatives. One alternative to generate power instead of burning fossil fuel is hydropower. "Hydro electricity is generated through water pressure. Hydroelectricity energy is one of the cleanest and cheapest alternative sources. Power stations that contain turbines and generators are built near the downstream side ... power, the most useful energy might be solar energy. There are many methods to harness the energy of the sun like focusing collectors, flat plate collectors, solar distillation, and sol...

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... responsible for the largest amount of CO2 output. This project will investigate if income is a determining factor in the carbon emissions by individuals. A questionnaire about income, travelling, electricity utilisation, eating habits size of household, and pets has been distributed randomly. We used the answers to these questions to determine the amount of CO2 that is outputted per ... set. Taking cognizance of privacy and the reluctance to divulge income, 5 income brackets were determines, increasing in size as the income increases. Dependent: Household and Electricity: To determine el...

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... resistance, and superconductors, comprised of certain metals such as mercury and ceramics such as lanthanum-barium-copper-oxide, have no resistance. Resistance is an obstacle in the flow of electricity. Superconductors also have strong diamagnetism. In other words, they are repelled by magnetic fields. Due to these special characteristics of superconductors, no electrical energy is lost while flowing and ... Once the magnetic field is more than the value of the first critical field, the superconductor no longer repels the entire field; however, the superconductor does continue to conduct...

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• Grade Level: Undergraduate

... volumetric growth resulting from additional gas-fired electric power plants. In particular, new combined-cycle facilities furnished with more efficient gas turbines will help lower the cost of gas-generated electricity to levels competitive with coal-fired plants. Increased consumption of natural gas in the United States will require expansion of gas pipeline and storage capacity. By 2020, U.S. gas ... petroleum-fired capacity in the East, hydroelectric in the West, and gas-fired capacity in the Coastal South. U.S. power demand is increasing rapidly, with a 1.8% average annual growth in...

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... by 1993-94. Industry This comprises gross value addition at factor cost in mining and quarrying, registered and unregistered manufacturing, construction, and electricity, gas and water supply. Industry accounted for 28 per cent of gdp at current prices during 1994-95, showing a secular increase from ... In industry, manufacturing accounts for over 70 per cent in value addition, while construction accounts for 15 per cent. Mining and quarrying, and electricity, gas and water supply together account for the balance 15 per cent. Mining and quarrying This comprises extraction of minerals whi...

• Word Count: 4620
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• Grade Level: Undergraduate

... , strong materials with high melting and boiling points. The strength, elasticity and ability to bend without breaking of many metals make them useful in construction. Metals are good conductors of electricity because these 'free' or delocalised electrons carry the charge of an electric current when a potential difference (voltage) is applied across a piece of metal. Copper, for example, is used to make ... attraction that exist between particles require very little amount of thermal energy to be broken and so have low melting and boiling points Covalent molecular substances are bad cond...

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... 15,000 pounds) of greenhouse gases are emitted per person every year. Most of these emissions, about 82%, are from burning fossil fuels to generate electricity and power our cars. The remaining emissions are from methane from wastes in landfills, raising livestock, natural gas pipelines, and coal, as well as from ... the state you live in. Several factors can affect the emissions per person in a state, for example, the types of fuel used to generate electricity, population and vehicle miles traveled ,and whether fossil fuels are extracted or processed within the state. As an individual, y...

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• Grade Level: Undergraduate

... efficient way to utilize fossil fuels (oil and natural gas) and convert them straight into automotive power. The fossil fuels are burnt at a power plant to produce energy to make electricity to recharge batteries rather than being used in air polluting internal combustion engines.? (Encarta)3Substances that pollute the air can be controlled more easily at a power plant than at the ... tailpipes of millions of gasoline-burning cars.? (Encarta) Electric cars are a simple and effective way to harness existing energy because any energy source can be turned into electricity. Electric cars ha...

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... the 19th century, the USA had become an industrial giant. The first industrial revolution, based on coal, brought steam engines, steel, railways and mechanisation. The second industrial revolution, based on electricity and oil, was sparked by the First World War. Wartime demands encouraged the development of new materials and new techniques. These new materials and new techniques were then used as ... did almost nothing to help farmers. . Some industries, once prosperous, were overtaken by new rivals. For example, many coal mines were closed down in face of competition from oil and elec...

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... cannot imagine but that he was a philanthropic person. Edison, the great inventor, is also a great thinker and a great human. He was occupied with spreading electricity to all the people. The efforts were crowned with success in the year 1883. Sometimes it happens that a certain solution entails a new solution to a ... an answer to a question but you are faced with a new problem resulted from the answer you provided. Running electricity to homes entailed that some kind of device to measure the amount of electricity consumed by customers be invented. The Weberemeter was Edison's solution...

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... myself, the man who calls himself my lover, behind me in the next room. The way we laugh when we hit the switch knowing there's no electricity, or turn the faucet to wash our hands anyway, plumber downstairs, no flow. Do what you've always done, and you'll get what you've ... have. Egan talks about the habits common to many of us: switching the lights on even when there is no electricity and we know it ("when we hit the switch knowing there's no electricity," 5-6), and trying to wash the hands, even though there is some work done by the plumber in the ... habits in particular, and it see...

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... strategy for the country with the focus on growth through development. To achieve this the RDP seeks to address basic needs (such as housing, electricity, sanitation, water, nutrition and primary health care) by focussing on economic policies that would best encourage the provision of these needs. Such policies ... of GDP (%) 1960 1970 1980 1993 Primary sector 25,1 17,0 27,9 13,3 Agriculture, fishing 12,4 7,9 6,8 4,6 Mining, quarrying 12,7 9,0 21,1 8,7 Secondary sector 26,6 30,8 28,9 30,7 Manufacturing 21,0 23,9 22,5 23,5 Electricity, gas, water 2,5 2,6 3,1 4,0 Construction 3,1 4,2 3,3...

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... customers in Arizona. In addition to APS, Pinnacle West also owned a real-estate subsidiary, SunCor, which accounted for four per cent of operating revenues in 2008. The electricity generation, transmission and distribution activities contributed to 93 per cent of the operating revenues in 2008. Pinnacle West employed approximately 7,500 people, and of those approximately 6,900 ... . The utilities industry was a highly regulated industry in the United States. In Arizona, the Arizona Corporation Commission (ACC) regulated electricity rates. Although there had been sporadic attempts at der...

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... , where the metal can be easily bent without breaking, allowing it to be drawn into wire. The free movement of electrons also explains why metals tend to be conductors of electricity and heat. Plastics or polymers of the organic type consist of long chains of molecules which are either tangled or ordered at room temperature. Because the forces (known as van ... to  measure time  in watches and other electronics. Such devices use both properties of piezoelectrics, using electricity to produce a mechanical motion (powering the device) and then using this mechanical motion to produce elec...

• Word Count: 3326
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... . Service Module was attached to the base of the Command Module. It contained a powerful rocket motor and propellant tanks, together with fuel cells to make electricity, and other equipment. The Service Module was a cylinder 3.9 meters in diameter and 7.6 meters long. Outer shell of Service Module was formed of 2.5 ... minor problems, but 55 hours after the launch, the oxygen tank no.2 exploded, this cause Oxygen tank no.1 to fail and command module broke, which supplied electricity, light and water. "Houston, we've had a problem here " this words were said when the oxygen tank blew up. ...

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... , alkali metals, is extremely chemically reactive. In fact they are the most reactive of all the metals rarely existing alone in nature. They are excellent conductors of electricity (sodium and potassium) are used carry electricity even in the human body. The alkali earth metals Group IIA are like alkali metals, except for the fact that they are extremely water-soluble. Magnesium and ... and aluminum. While some of these metals are hyperactive, some are relatively stable because their electronegativities are stronger than other elements. Semiconductors and metalloids have common uses as ...

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... Equality's night hide away. There he will write down his ideas to perform scientific expieriments. In his special hide away he figures out how he can use electricity to make light. He think his discovery will earn him a job as a Scholar, but instead they get enraged and want to punish him.. Equality runs ... forced brotherhood of all men will only deplete the spirits of those who are successful. In Anthem, Rand tells of Equality's joy when he "discovers" electricity. At that moment he knows that the joy of discovery is only his to relish, and that it cannot be shared or manipulated by an...

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... with everything. He tried different lighting systems often. 4"To counter fears of alternating current, Tesla gave an exposition in his laboratory in which he lighted lamps without wires by allowing electricity to flow through his body." Since childhood Tesla had dreamed of harnessing Niagara Falls in late 1893. His dream became real, when Westinghouse was awarded the contract to create the ... , was left in financial difficulties. After the success of Niagara Falls, Tesla rejoined his favorite work, experimentation back at his lab. Tesla interested himself in the exploration of high freq...

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... OVERVIEW OF NIGERIA The oil-rich Nigerian economy, long hobbled by political instability, corruption, and poor macroeconomic management, and the poor state of infrastructural facilities like health, education, electricity supply, roads and shelter. Is undergoing substantial economic reform under the new civilian administration. Nigeria's former military rulers failed to diversify the economy away from overdependence on the capital-intensive ... the future of Internet banking is Nigeria's poor infrastructure. World Bank data indicates that in Nigeria there are only 6 computers and 4 main...

• Word Count: 17126
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• Grade Level: Undergraduate

... over five kWh/square meter/day throughout the year, which is comparable to southern Arizona. Realizing this, Cuba has embarked on an ambitious rural photovoltaic program to bring much needed electricity to the unserved parts of the population. A typical solar system on a rural house uses two forty-watt PV panels and a 150 amp-hour battery to provide power for five 20 ... about 40 kWh per ton of cane, whereas the typical conversion rate in industrialized countries is 60 to 80 kWh. In Hawaii, with the use of better electricity cogeneration technology, net exports of electricity already re...

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... was convicted of murdering his girlfriend with an axe. Kemmler's right leg and head were shaved and a white paste that enhances the flow of electricity was rubbed onto his head. The public came to believe that the chair was more efficient than hanging and that it lessened the suffering of the ... executed. However, after a 17-jolt of electricity, Kemmler appeared dead but jerked suddenly. Immediately, the current was turned back on. Kemmler groaned and jerked once more and witnesses of the execution ... would watch the execution from behind a window. A black leather mask was placed ov...

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... knowledgeable on things scientifically. "Each one of us is a cause of global warming, but each one of us can make choices to change that with the things we buy, the electricity we use, the cars we drive; we can make choices to bring our individual carbon emissions to zero. The solutions are in our hands, we just have to have the ... given and the time allocated for it in the movie is very poor. There is hinted that using technology can be a good solution to cut the CO2 levels, using green electricity and economic light bulbs. But I think a better solution is to change the regulations o...

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... in traditional views of Romantic organicism and its model metaphors: "Attempting to write nature--not to imitate it as a model but to participate in its processes (as a bird sings, as electricity sparks)--the symbolic writer aspires to create linguistic whorls of centrifugal and centripetal forces ... to inspire an experience of ecological seeing, to be the currents of nature." (30) This shift ... mind; instead, mind is metonymy of its own nature. David Robinson has argued that Emerson's attendance at various natural history lectures in London in 1848, including lectures by Faraday on e...

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• Grade Level: Undergraduate

... days' shut-down to allow for the removal of plutonium-containing spent fuel and for refuelling). When weapon-grade plutonium was not required, the reactors were re-optimised to provide electricity for sale to the grid, entailing much longer irradiation periods. As a result, substantial quantities of fuel- and reactor-grade plutonium containing relatively large proportions of even-numbered isotopes have also ... final source of weapon-grade plutonium for the British bomb programme. Before ownership of these reactors was transferred from the UK Atomic Energy Authority to the Central Elect...

• Word Count: 14040
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• Grade Level: Undergraduate