Hello‚ my name is Gold. Most people call me by my nickname‚ which is Au. My nickname comes from the Latin word for gold‚ “aurum”. I have many uses and some of them you may have never heard of. Humans probably have known me and treasured me since prehistoric times. No one knows who really discovered me but humans do know that they can trace back their use of me back to at least 6300 years ago. My wide spread use over the course of human existence is the very reason that no one knows who discovered
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handling a battery since it can produce explosive gases. Do not smoke‚ create a spark or light a match near a battery and always wear protective glasses and gloves. Have it checked with every oil change. Cable should be attached securely and be free of corrosion. Inspect your belts and hoses monthly. Replace worn‚ glazed or warn belts. Tighten your belts
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ways to treat them. Some diseases and health problems involve processes that can only be studied in living organisms.” However‚ there are other ways to test cosmetics and medicine. For example‚ a possible way to find results for eye irritation and corrosion is to measure using three-dimensional human equivalent systems like EpiDerm and SkinEthic. This can put an end to cosmetic and medical animal testing. Someone with a different perspective may say that animals like chimpanzees and mice share at least
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Alternatives to Animal Testing Throughout history‚ animal testing has been used for a variety of research and tests‚ but we never stop to realize the cruelty and inhumanity of their environments. Gandhi once said‚ “The greatness of a nation and its moral progress can be judged by the way its animals are treated” (qtd. in Hajar). Animal testing is unnecessary and irrational because we have the technology to replace the inhumane testing‚ which proves to be even more accurate and precise with its
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meet the above functional requirements the material used for manufacturing the product should contain many properties. They are‚ the material should contain high strength‚ modulus of elasticity‚ wear resistance‚ ability to withstand vibrations‚ and corrosion resistance. High strength is mostly concerned in diesel engines because of their high compression ratios compared with petrol engines. In diesel engine its compression ratios are normally 17:1 or greater‚ but in petrol engine it is nearly 10:1. The
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(AHC) 3-10 3.2.4 Soft error 3-12 3.2.5 Reliability problem of nonvolatile memory 3-14 3.2.6 Electromigration (EM) 3-16 3.2.7 Stress migration (SM) 3-20 3.2.8 Reliability of Cu wire 3-23 3.2.9 Al corrosion 3-25 3.2.10 Passivation crack 3-32 3.2.11 Growth of Au/Al compound 3-35 3.2.12 Secondary breakdown 3-36 3.2.13 Thermal fatigue 3-37 3.2.14 Ion migration 3-38 3.2.15 Sn whisker 3-39 3.2.16
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Kagan McDonald Mrs. Wilmott SAE 2nd 10/1/13 Welding Risk and Safety Precautions Welding is a really good blue collar job that pays well‚ but has its ups and downs. Welders have to deal with hazardous welding fumes that can affect their health in numerous ways. There are several different types of welding fumes and mixtures that a welder can inhale while performing a welding task. A welder’s risk of getting sick from welding depends on the different types of metals being welded and the
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MECHANICAL SEALS FOR PUMPS S. Raghavachari Consultant Chennai Abstract Mechanical seals are pieces of engineering marvel. Process industries could meet today’s stringent environmental pollution regulations through the effective sealing of even the most difficult fluids. This paper describes different kinds of seals‚ their design‚ properties and functioning. Effect of various factors like seal balance‚ face pressure‚ temperature and lubrication on performance of seal and probable causes
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used overcoming the lesser friction of the smoother less angular bedload. There is more transportation of material‚ and more suspended sediment. The bedload is smaller and more rounded as it has been subjected to more erosion (namely attrition or corrosion). The main feature seen is the meander. Meander These are bends that form when the slope of a river
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of thumb‚ rather than a fact. Painting‚ anodising or plating metals are good ways to prevent their corrosion. However‚ a more reactive metal in the electrochemical series must be chosen for coating‚ especially when chipping of the coating is expected. Water and the two metals form an electrochemical cell‚ and if the coating is less reactive than the coatee‚ the coating actually promotes corrosion. Physical Porperties of Metals Traditionally‚ metals have certain characteristic physical properties:
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