How does the radio propagate indoors?. Tasks

Part1 (up to <To determine the size of each zone>

Task1 Find words or expressions meaning the following:

1. Due to

2. rise and fall irregularly in number or amount

3. plain or obvious; clearly seen or understood

4. rise or move up

5. combine or cause to combine to form a single entity

6. quite the reverse; not at all

7. happening without method, disorderly

8. to worsen

9. strong and not likely to have problems

Task 2 Say whether the following is true , false or nor mentioned.

1. When radio waves reach a metal object they are partly absorbed by it.

2. Signals of equal amplitude arriving simultaneously from different paths always interfere with and cancel each other.

3. Modern concrete buildings can effectively reduce radio signals level due to reinforced concrete.

4. The greater the distance between the receiver and transmitter, the more likely the null zone is reached .

5. To have a good quality signal it is important to determine how big the three zones mentioned in the text are.

6. It is very easy to identify the size of the null zone as it is stable and doesn’t change its position in space.

7. The above phenomenon is widely used in stealth technologies.

Part2 (from <to determine the size up to the end)Find words or expressions meaning the following:

1. To influence

2. To weaken

3. Not enough

4. The number of times the signal is lost

5. Something that is worth having or doing because it is useful, necessary, or popular.

6. remember and take into account

7. an inefficient use

8. as soon as, when

Rolltronics

The ability to prnt computer components, rather than making

them on silicon wafers, could lead to lighter, cheaper computers—and you could even roll them up

WHICH invention had the greater impact: the printing press or the computer? Now imagine the potential impact of being able to combine the two and mass-produce computers almost as easily as newspapers, by printing them out on to thin films of plastic. That goal is what Rolltronics, a firm based in Menlo Park, California, has set out to achieve. It hopes to do this by extending a manufacturing technique, called “roll-to-roll” processing, so that it can be used to make computer components currently made in the form of silicon chips.

Roll-to-roll, as its name suggests, involves winding a continuous roll of flexible material (such as paper, plastic or metal foil) from one spool to another. Along the way, the material is subjected to a series of manufacturing steps. This approach is used to do things from printing newspapers to coating the insides of potato-crisp bags. Roll-to-roll manufacturing is also used to create flexible wiring, such as the transparent plastic “ribbon” connectors seen inside ink-jet printers. Rolltronics plans to take the next step, and extend the process to make flexible logic circuits, memory and other components.

Compared with the traditional approach, in which chips are made in batches in expensive factories, roll-to-roll processing involves far lower set-up costs, and can be more easily scaled up. So if it can be extended to produce computer components, it would be a cheap and fast—not to mention flexible—way to make electronic devices.