Aluminium Presentation Essay Example for Free

Aluminium Presentation Essay Ive done my presentation on Aluminium and will be talking to you about its properties, where its found and its uses and why its the best material for these purposes. Aluminium. Chemical symbol Al. Atomic weight approx 27 Atomic number 13 and electronic configuration 2-8-3. Appearance- pure aluminium is a shiny silvery white material. Down to the molecular level aluminium has a polycrystalline structure where the metal has cooled from different areas of the material where. Where these areas meet are called the grain boundary. This structure gives aluminium its many properties. Density The first thing you notice about aluminium is its relatively lightweight. It has a density of 2,7g/mm3. This is about 1/3 the weight of a piece of steel the same size. Resists Corrosion like many other metals aluminium is very reactive in air and thus a fine layer of aluminium oxide is created on the surface. This provides provides a highly effective barrier to the ravages of air, temperature, moisture and chemical attack. 0.000000635cm Highly reflective Free electrons in the metal absorb the light energy then immediately re emit it.emits 90* of the light that it absorbs. This would not happen if free electrons wernt present. Ductile Aluminium can be bent and shaped extremely easily. This is because of it polycrystalline structure. Along the grain boundaries of the material dislocations in the atoms occur. It is the movement of these dislocations that makes this metal very ductile. This is good for shaping aluminium but very bad for its strength. Strength like many other of aluminiums properties it depends on the purity of the material 99.996 per cent pure aluminium has a tensile strength of about 49 megapascals (MPa), Unlike materials such as steel, aluminium gets stronger as temperature drops. rising to 700 MPa following alloying and suitable heat treatment. Conductance aluminium is one of the best conductors of electricity. Because it is a metal it ontains almost a soup of free flowing electrons which make it very easy for a current to flow through it. Aluminium itself conducts about 63% of that of copper of the same mass. Aluminium is also a great conductor of heat conducting about 220 Watts Occurance Aluminium is the most abundant metal in the earths crust. Only the non metal elements oxygen and silicon are more abundant. The largest deposits of aluminium are found in Australia, Guinea and West Indies. Aluminium does not occur in its pure form but as either an aluminium silicate or as bauxite which consists of aluminium oxide and commonly iron oxide also. As seen in the picture the aluminium ore is a redish colour this is caused by the iron ore mix. Bauxite is produced through chemical weathering of rocks in tropical climate. Extraction The method now used for aluminiums commercial production is the electrolysis. An iron pot, lined with carbon, is charged with cryolite and heated to about 800à ¯Ã‚ ¿Ã‚ ½C by the electric current. For the electrolysis, a bundle of carbon rods is used as the anode, while the pot itself forms the cathode. The oxygen liberated combines with the carbon of the anode to form carbon dioxide, while the aluminium falls to the bottom of the vessel. More alumina is added and the process continued, the molten metal being drawn off from time to time. Uses Aircrafts Mainly because of its lightweight. This feature is utilized by aircraft and can cut the weight down by up to 5 tonnes. This means planes can fly fast and be more economical. This also applies to all transportation allowing increased loading capacity also. Usually it isnt actually pure aluminium because of its poor strength but instead alloys of aluminium which can be as strong as 700 Mpa. Buildings Aluminium is used in construction mainly because of its corrosion resistance. Its is also a very easy material to shaped and mould making it ideal for the uses in construction Electrics Aluminium is a very economical material as an electric conductor and is widely utilized in power transmission cables. Aluminium only has 60% conductivity of copper but weighs a 1/3 as much making it ideal for large power cables. Heat aluminium is about 3 times as thermal conductive as steel. This feature is used in cooking utensils, engines, air conditioners and it is also being used in energy saving equipment such as solar cells. Reflective Because aluminium is reflective of most electric, heat and light waves it is being more commonly used in the insulation of homes. Harsh conditions Unlike steel which gets brittle in cold conditions aluminium get stronger making it the perfect material to use in harsh conditions. Aluminium is now being used on snow-mobiles Cans aluminium is a non toxic material, smooth, easily washable and is hygienic because no germs an grow on it. Also because malleability it can be shaped into any shaped or form making it ideal for packaging Because of aluminiums low melting point approx 600 C it is the ideal material in this age of energy and resource saving to recycle.

DMCA and Russia :: Copyright Laws Sharing Essays

DMCA and Russia Background Information Traditionally, book authors have had the Copyright Law to protect their creations. That changed, however, since their books have become available in electronic format. In short, the creations had been turned into information – one that can effortlessly be copied and distributed thanks to invent of computers, Internet, and (lately), cheap data storage devices. Adobe Corporation’s eBook was meant to fix that problem for the copyright owners, while letting the readers keep their rights to their copy of the book. A book translated into eBook format would contain various permissions in it, preventing the user from being able to share the book with anyone else (by tying the eBook’s decryption key to the user’s computer). Additionally, the distributor of the book would be able to specify whether the book can be transferred to paper (printed), text copied, book edited, etc. In theory, such restrictions would prevent unlawful distribution of books in electronic format. Unfortunately, the golden rule of computer security applies in full force here: the level of security is inversely proportional to the usability of the product being secured. In short, Adobe’s restrictions allowed the publishers to prevent users from printing a legal copy of the book (to read away from a computer), creating a backup copy of the book in case the computer has to be restored from a failure or upgraded, and other limitations, e.g. disabling built-in provisions for vision-impaired users. U.S. vs. Dmitry Sklyarov & ElcomSoft Since 1993, in mid- to late summer, DefCon, a yearly convention of hackers1 has occurred in Las Vegas, Nevada. In 2001, two programmers from Russia – Dmitry Sklyarov and Andy Malyshev – presented their findings of flaws in protection schemes used by the Adobe’s eBook format.2 Dmitry was arrested by the FBI half an hour before boarding a plane back to Moscow, Russia.3 Even after holding Dmitry for more than a week, no bail hearing was even scheduled. The Electronic Frontier Foundation (EFF) – a non-profit organization dedicated to protecting the freedoms we enjoy in the physical world, in the digital world – has stepped in and started with organizing protests aimed at freeing Sklyarov from jail. These protests have been postponed while EFF representatives met with representatives from Adobe Corp. and US Attorney Office. As a result, Adobe Corp. has dropped its support of the lawsuit, but the case was not closed. It was only after 3 weeks that Dmitry was finally released, on a $50,000 bail.

Mountain Top Removal

November 2010 Solution: Eight Letters, One word, Mountaintop Removal Mountaintop removal although only eighteen letters and a mere two words provides endless opportunities for hard working Americans. The world is now all about efficiency and convenience. Society works as a machine, and each machine needs fuel to work. For Kentuckians, the fuel is Coal. The economy of Kentucky centers around coal. It not only gives hard working Americans a safe environment to work in but provides jobs, and stable economy for our nation.When compared to the rest of the world America has always had a strong economy. However America is currently in a state of recession. Politicians, cabinet members and economists are constantly trying to bring our great nation back into a state of equilibrium concerning monetary flow. Mountaintop removal is one way to achieve this. Areas which are abundant in coal are blessed with multiple lucrative opportunities which benefit not only the communities’ economy but the Nations, as well.Mine Safety is one thing that is extremely misunderstood. There is a lot of controversy, about mine safety regulations. But, the truth is that MTR is statistically the safest form of mining. Compare MTR to underground mining. Underground Mining: deep within the earth, hollow shafts, narrow tunnels, darkness all around, the fear that the mine may collapse at any time VS. MTR: Employees are above ground, have state of the art technology to help with safety protocol, and Mine collapsing isn’t a fear employees have to worry about.Jobs, something that loyal Americans are fighting for in the savage Job market. Mountain top removal offers long term jobs which also helps the economy. A fact, most people don’t know is that for every miner employed through MTR three new jobs are created. Thus, helping employment rates go up and keeping our economy running. Americans need jobs and through MTR we can make that happen. Mountain top removal: eighteen letters, t hree words, endless opportunities. Coal: four letters, one word, keeps the lights on.Although Opponents to MTR claim that it hurts the environment, creates a fair-weather economy, and is unsafe for its’ workers the truth is, MTR creates an almost identical landscape after reclamation, it continues to provides jobs even when the coal is gone and has been proven to be statistically safer than underground mining. Although the perspectives about MTR will continue to vary it is a lifestyle millions have adapted to already. Without MTR millions would be unemployed, the oven that makes our thanksgiving turkey would not work, a child wouldn’t have the electricity to read his or her first book.MTR is a permanent way to fix our problems. Kentucky is more than just a geographic state, it’s a state of mind and a state of heart and without MTR it would wither away into a perpetual end.Works Cited The Purdue OWL. Purdue U Writing Lab, 2010. Web. Date of access. Reece Erik , . Lost Mountain . New York : Riverhead, 2006. Print. Kitts, Gene. The Charleston Gazette. Charleston: Charleston Gazette, 2008. Print. Lemon, Eric. http://www. marshall. edu/cber/media/010420-DA-mountain. pdf. Charleston: Athenaeum, 2001. Print.

Oppenheimer And The Atomic Bomb Essay examples - 3793 Words

Julius Robert Oppenheimer and the Atomic Bomb J. Robert Oppenheimer was a brilliant physicist and known as the †Father of the Atomic Bomb†. A charismatic leader of rare good qualities and commonplace flaws, Oppenheimer brought an uncommon sensibility to research, teaching, and government science. After help creating the atomic bomb with the Manhattan Project he was banned from the U.S. Government during the McCarthy Trials. He opposed the idea of stockpiling nuclear weapons and was deemed a security risk. Oppenheimer’s life reveals the conflict between war, science and how politics collided in the 1940’s through the 1960’s. His case became a cause quot;celebrequot; in the world of science because of its implications concerning†¦show more content†¦The Born-Oppenheimer Approximation states that since nuclear motion is much slower than electron motion the electronic wavefunction, or energies, can be calculated assuming a fixed position of the nuclei and nuclear motion can be considered ass uming and average distribution of electron density. On returning to the US, Oppenheimer pursued his study of Diracs theory of the electron - proposing the existence of an anti-electron (equal in charge but positively, not negatively, charged) - a quot;positronquot;, first seen by Carl Anderson in 1932. During the 1930s, Oppenheimer held positions at both the University of California, Berkeley and at the California Institute of Technology, enabling him to gather together a team of highly talented, young theoretical physicists. Berkley was known as the center of American Quantum Physicists at the time, because of Oppenheimer’s work. In 1939 he took quantum mechanics into astronomy, proposing that the largest stars could collapse into quot;black holesquot; from which not even light could escape. In the early twenties new scientific theory about the atomic structures was being discovered. He worked on quantum theory and trained an entire generation of United States born physicists. His method of teaching was very difficult and most students failed his classes, but they still took them and eventually passed them. He became interested with politics during the rise of Nazism inShow MoreRelatedJulius Robert Oppenheimer, the Man Who Created the Nuclear Bomb1100 Words   |  5 PagesOne man created a nuclear bomb, ended a world war, saved hundreds of thousands of lives, all while creating a new wave of theoretical physics. He was born on April 22, 1904 in New York. 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