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Who says that there is nothing left to invent? For thousands of years, the mirrors have stayed the same. Every morning you stare at one. But you always notice that you are looking at some foreign characters on your shirt. It is because of reflected image or negative image instead of positive image as demonstrated by the second mirror. one NEG + one NEG = one POSITIVE image. By the use of second mirror or prism, one can make a positive image. One of the biggest market for the positive image ...

Tags: Mirror Postive Mirror Car Mirror

A Green Technology Challenge: Pressure reducing valve (PRV) is a valve that regulates the pressure, in our case, water or liquid fluid, from a higher pressure to a lower pressure. In other words, it is a devise to dissipate energy. For example, people living at the bottom of a hill usually experiences a higher than required water pressure. And in industries and large building complexes, some of the equipment, such as air conditioning units or chillers, do not require a higher pressure. In ...

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