CHAPTETR 9:Scientists "wall paper peeling mystery"

According in science daily we know that the system for controlled tear experiments an adhesive film is glued to a surface, two slits are cut and the system than provides a steady pull on the tab. By analyzing these observations, the physicists have shown that the shape of the flaps is triangle with an angle depending on three characteristics of the adhesive material, its adhesion, its flexibility and its resistance to tearing.
The researchers have put together a formula which allows the characterization of one of these properties based on the other two and on a simple measurement of the angle of the triangle. Materials engineers could use these results in industry to calculate one of the three properties when other two are known. This could be particularly useful for the characterization of ultra-thin films.Which is difficult to manipulate and which are basic elements in micro-or nano-system.


CHAPTER 10:Scientist suggests use rocket-powered water gunto blow away space junk

According to a report by Fox News,the aerospace engineer in question is Jim Hollopeter,who in the 1980s helped design rockets that shot into orbit.
Bits of spent rocket boosters, old exploded satellites and tools dropped by space-walking astronauts are just some of the trash racing along in the near-vacuum of space.The volume of man-made space debris has grown so large. The crash prompted Hollopeter to refine designs for a concept he had long toyed with: Using aging rockets loaded with water to spray orbiting junk.
This idea is that the extraterrestrial shower would gradually knock refuse down toward the atmosphere, where it would burn up, as would the launcher. The water would turn to steam.According to Heiner Klinkrad, who runs the European Space Agency's Space Debris Office in Darmstadt, Germany, "We need to treat space like a national park - carry out what you carry in."


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