Texts and exercises on information science. Мартынов О.В. - 18 стр.

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СПб ГУАП | Санкт-Петербург

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6. Your computer is not complete … the monitor.
7. The sharpness … the picture depends … the number and size …
these pixels.
8. Some … the controls … the monitor change the size and position
… the image.
9. Windows includes a number … screen savers.
10. The drives can read and write … floppy diskettes.
11. The amount and variety … material you can access … CD-ROM
is amazing.
12. If a diver wants to know an accurate depth he is down, he must
set water type he is… .
13. If a diver wants to know how long he has been down, he can see this
… the display.
14. Before he descends, the diver sets the time … ascend.
15. Optical communication promises a considerable increase …
capacity, quality, performance and reliability … the global
telecommunication network.
16. The system most widely used now operates … 147 megabits
(thousand bits) per second.
17. The first digital optical disks were produced … 1982 as compact
disks … music.
18. The information is recorded … using a powerful laser to imprint
bubbles … the surface … the disk.
X. Translate:
1. Новые технологии, такие как оптические волокна, увеличат
скорость связи и предоставят новые услуги по специализированной
информации.
2. Последующее развитие высоко эффективных лазеров наряду
с постоянным совершенствованием кремниевых волокон
невероятной
прозрачности позволят передавать пучки света на расстояние 135 км
без необходимости усиления или восстановления.
3. Технология оптических дисков представляет собой переворот
в области хранения информации.
4. Информация записывается при помощи мощного лазера,
оставляющего пузырьки на поверхности диска.
5. Каждый день оптическая технология находит все новые
применения от связывания в сеть
нескольких компьютеров,
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находящихся в одном здании или комнате до межконтинентальной,
трансокеанской и космической связи.
XI. Give summary of the above text.
TEXT 12
An Encyclopedia on a Tiny Crystal
Scientists have discovered that a laser beam can be effectively
used to record alphanumeric data and sound on crystals. According to
Russian researchers a method for recording information on crystals by
means of a laser has already been developed, but advanced
technologies are needed to make it commercially applicable.
At present researchers are looking for the most suitable chemical
compounds to be used as data storages and trying to determine
optimum recording conditions. Theoretically, the entire «Great
Soviet Encyclopedia» can be recorded on a single tiny crystal.
As far back as 1845, Michael Faradey discovered that a light
beam reverses its polarization as it passes through a magnetized
crystal. Scientists of our day have used this phenomenon to identify
crystalline materials capable of storing information. Lasers have
been successfully employed to record information on and read it off.
No ideal data storage crystal has yet been found, but it is obvious now
that the future of computer engineering lies in lasers and
optoelectronics.
ASSIGNMENT TO TEXT 12.
I. Read and translate the text.
II. Answer the following questions:
1. What have scientists discovered? 2. What method has been
developed according to Russian scientists? 3. What are researchers
looking for at present? 4. What did M. Faradey discover long ago and
how is the phenomenon used nowadays?
III. Make all types of questions to the following sentence:
according to Russian researchers a method for recording information
on crystals by means of a laser has already been developed.

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