|Just about everyone knows that plastic valves‚ pipes‚ tanks‚ and fittings are molded‚ but there ís a bit more to it than that. Knowing something | |about the processes that are used to produce these products will help to make you more knowledgeable in selecting and using them in various | |applications. | |
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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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Plastic and Environment A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass‚ but they often contain other substances. They are usually synthetic‚ most commonly derived from petrochemicals‚ but many are partially natural. Composition Most plastics contain organic polymers. The vast majority of these polymers are based on chains of carbon atoms alone or with oxygen‚ sulfur‚ or nitrogen
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Wooden Versus Aluminum Bats What happened to the old fashioned crack of the bat? The wooden bat has been used since the game’s establishment in 1864. An aluminum bat is more dangerous that a wooden bat due to the advanced technology. However‚ I believe that a wooden bat is better than a aluminum bat. The baseball bat controversy has been lingering over amateur baseball since the NCAA (National Collegiate Athletic Association) allowed the use of aluminum bats for the first time in 1974 (Adelson)
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THE HISTORY OF MONEY [A] The yen‚ the dollar‚ the quetzal‚ or the peso—no matter what the currency is called‚ money is an important part of life in nearly every culture today and has been throughout history. The concept of money dates back thousands of years. Originally‚ money was not metal coins or paper bills. Rather‚ people paid for things with objects that were useful and therefore considered valuable. We sometimes call this commodity money. Some examples of commodity money used throughout
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Book Review: “Wooden on Leadership” John Wooden is a legendary basketball coach‚ best known for his UCLA dynasty‚ which won an unprecedented and unthinkable 10 national championships in 12 years. That stretch included an 88-game win streak and four perfect seasons. But Wooden’s proudest accomplishments are not those of which are collected in the annals of sports history. And they have little to do with winning or losing. In his book “Wooden on Leadership‚” the coach reveals that he never
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P 61. Good Values Attract Good People “I saw how character—doing the right thing—is fundamental to successful leadership” (63). Wooden on his non recruitment strategy‚”The last thing you want is people in your organization who had to be talked into being there‚ who needed convincing that your team was worth of them.” (66). Wooden comments on the four reasons why Kareem Abdul Jabbar went to UCLA to be: Evidence of equality‚ Scholastic merit‚ Credible‚ heartfelt testimonials‚ and that they were
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Light wooden framed buildings were originally discovered when light partition walls were capable of forming a construction system by themselves. The system consists of timber studs frames assembled on site and tilted vertically or horizontally depending and what is needed. The idea was improved and accelerated with the availability of cheap mass produced nails and properly planed and cut pieces of wood. The first step to building a light timber platform building is to lay foundation walls to support
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The Effects of Plastic Bags on Environmentt * | * The effects of plastic bags on the environment are really quite devastating. While there are many objections to the banning of plastic bags based solely on their convenience‚ the damage to the environment needs to be controlled. * There is no way to strictly limit the effects of plastic bags on the environment because there is no disposal method that will really help eliminate the problem. While reusing them is the first step‚ most people
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school lunch tray? They can all be made from recycled plastic bottles or containers. In fact‚ the bottle you recycle in your own town can end up being spun into a pair of mittens worn by a child who lives in Japan. The plastic containers you recycle can take quite a journey once they leave your house. Of course‚ they can also wind up being put to the same use as before. We’re going to explore some unique paths you may not know about. Plastic recycling began in communities in the early 1980s with
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