A fuel cell is a device that transfers the chemical energy from a fuel into electricity through a chemical reaction of positively charged hydrogen ions with oxygen or another oxidizing agent [1]. Fuel cells can produce electricity continuously until these inputs are supplied. The first fuel cells were invented in 1838. Since then‚ fuel cells have been used in many other applications. Fuel cells are used for primary and backup power for industrial‚ commercial and residential buildings and in inaccessible
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In arsenic contaminated areas of the Ganga–Meghna–Brahmaputra (GMB) plain (area 569 749 sq. km; population over 500 million) where traditionally cow dung cake is used as a fuel in unventilated ovens for cooking purposes‚ people are simply exposed to 1859.2 ng arsenic per day through direct inhalation‚ of which 464.8 ng could be absorbed in respiratory tract. Introduction Arsenic has been considered as a human carcinogen and causes multiple adverse health effects.1 Groundwater arsenic contamination
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Keep the grades Without a grading system‚ could anyone expect students to do better in college? If we stop using the grading system for college students then students will lose motivation to help them in their studies. Additionally‚ keeping the grading system will help students show where their weakness in a subject is at. Lastly‚ the system provides a way to measure students ranking in their academic achievements. Colleges should keep the grading system to motivate students to do well in school
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a Hobby”‚ William believes that most people are grade three thinkers. Grade three thinkers tend to feel‚ and not to think. Golding gives an example of his teacher Mr. Houghton‚ who would always talk about “good life‚ sexless‚ and free of duty”‚ while “his neck would turn of itself” if a girl passed by the window (164). I think he is right; most people will speak or do without speaking. For example‚ William says in his essay‚ “A crowd of grade-three thinkers‚ all shouting the same thing‚ all warming
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Hendershot Fuel Less Generator 2 Hendershot Fuel Less Generator What is a fuel less generator? All over the world‚ people live with the idea that it’s necessary to burn fuel in order to produce power that we can use. We have been persuaded that we have to buy coal‚ coke‚ timber‚ kerosene‚ gasoline‚ diesel‚ propane etc to burn‚ so that we can obtain our precious energy. And yes‚ it is perfectly true that burning these materials will indeed result in energy. And yes‚ we need it
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References: Anbari‚ F. T.‚ & Giammalvo‚ P. (2005). The Chunnel Project. Project Management Institute‚ 1-26. Bank‚ W. (1998). World Bank Archives. Retrieved 2012‚ from World Bank: http://www.worldbank.org/projects/P008181/guri-hydroelectric-project?lang=en Commission‚ I Donovan‚ S. (2003). The
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The story “A & P” revolves around the most regular of days‚ seen through the eyes of our main protagonist‚ Sammy. He is the cutting image of an 18 year old‚ fresh out of high school‚ working a job at a grocery store given to him by a family friend. Then‚ one day‚ the most exciting day Sammy has had all summer comes when 3 bikini-clad girls come into the store. This is the first bit of color in Sammy’s life surrounded by the white walls of A & P. This sudden appearance takes Sammy off guard‚ putting
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Making the Grade Kurt Wiesenfeld Kurt Wiesenfeld is a physicist who teaches at Georgia Tech in Atlanta. He wrote this essay for the “My Turn” column of the June 17‚ 1996‚ issue of Newsweek. It was a rookie error. After 10 years I should have known better‚ but I went to my office the day after final grades were posted. There was a tentative knock on the door. “Professor Wiesenfeld? I took your Physics 2121 class? I flunked it? I wonder if there’s anything
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Breaking the Regular Personal space is an invisible boundary separating one from others to be normally content. When violated‚ one may feel discomfort‚ anxiety‚ or even anger. As humans‚ we set rules in our minds called customs. Many of these vary from culture to culture but some are universal. One of those universal rules is the idea of personal space. In America‚ we have a strong sense of personal space‚ especially when it comes to strangers invading that space. From what I have experienced in
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Identify three renewable energy sources and assess their potential to replace fossil fuel The rapid depletion of fossil fuels has given serious warning that the era of using conventional energy is coming to an end. Due to the energy shortage‚ a need to find replacement of fossil fuels has appeared. Moreover‚ problems such as various pollution and serious climate change have occurred‚ which makes renewable and less pollution energy source alternative choices. Therefore‚ three options can be suggested
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