Тексты аудиозаписей к учебному пособию «Английский язык. 10 класс»
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Тексты-аудиозаписей-к-уч.-пос.-10-кл
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- How do you work on the nanoscale
- When did nanotechnology start
- Can we use nanotechnology in our everyday life
| How small is nanometer?
We live on a scale of meters and kilometers, so it's quite hard for us to imagine a world that's too small to see. Nano means "billionth", so a nanometer is one billionth of a meter. This is all very interesting and quite impressive, but what use is it? This is the work of nanoscience: it helps us understand why things happen by studying them at the smallest possible scale. Once we understand nanoscience, we can do some nanotechnology: we can put the science into action to help solve our problems. How do you work on the nanoscale? Your fingers are millions of nanometers long, so it's no good trying to pick up atoms and molecules and move them around with your bare hands. That would be like trying to eat your dinner with a fork 300 km long! Amazingly, scientists have developed electron microscopes that allow us to "see" things on the nanoscale and also work with them. When did nanotechnology start? Engineering on the nano-scale isn't a new thing. Animals and plants have long been using the nanoparticles and nanostructures in their shells, skins and wings. Bacteria and viruses act just like nanorobots. For example, a common bacteria called E.coli can build itself a little nanotechnology tail that it whips around like a kind of propeller to move it closer to food. Can we use nanotechnology in our everyday life? It could be you're already using nanotechnology. Clothes have just got clever with nanotechnology: the materials stay clean, warm, strong and dry. Nanotechnology is big news in sport. Tennis and golf players, skiers and mountain bikers are already enjoying the advanced technology with lighter, stronger sports equipment. The displays on everything from iPods and cellphones to flatscreen TVs are made from plastic built on the nanoscale. One of the most exciting areas of nanotechnology is building incredibly small machines from individual atoms. Nanomachines could be made into nanorobots (sometimes called "nanobots") that could be injected into our bodies to carry out repairs or sent into dangerous environments. Nanotechnology can be used in the food industry right from field to table. For example, nanomaterials could help keep food fresh for longer. Scientists are already manufacturing nano-sized vitamins that are easier for our bodies to take in. In the future they hope to create 'interactive' food - food and drink that could change colour, flavour or ingredients on demand. жүктеу/скачать 234 Kb. Достарыңызбен бөлісу:
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