О. В. Фёдорова е. В. Мезина е. В. Хамис английский язык в сфере информационных технологий и коммуникаций учебное пособие
EXERCISE 2 Words and word combinations to be remembered
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- EXERCISE 3 Would you like to work at an office Why/ Why not Make sentences about the office. The start is given to you in the table.
- Use words from the box below
| EXERCISE 2
Words and word combinations to be remembered: Feeder – 1)подающий механизм; питающий механизм; 2) фидер waveguide – волновод oscillation - колебание to undergo - выдерживать humidity and acing – влажность и обледенение reflecting metallic mirror – отражательное металлическое зеркало EXERCISE 3 Would you like to work at an office? Why/ Why not? Make sentences about the office. The start is given to you in the table.
Use words from the box below: Computers office plants coffee machine small dark photographs bookcase very tidy windows water fountain notice board stationery bin Text II Yuzhnoye State Design Office EXERCISE 1 Read and translate the text using the dictionary. Make up a plan to the content of the text. Over 35 years Yuzhnoye State Design Office has performed a great number of research and development activities having gained experience in creation of onboard antenna feeders (AF) intended for spacecraft and launch vehicles. High structural reliability of onboard antennas is confirmed by their long-term operation on over 100 domestic satellites including the Intercosmos family. At AF development over 50 proprietary engineering solutions protected by the national patents were applied. Yuzhnoye State Design Office has wide experience in development of feeder tracts intended for operation as parts of antenna feeders for spacecrafts and launch vehicles. There is a long list of the elements developed: frequency selective devices (filters, diplexers, multiplexers), power dividers (combiners), coaxial and waveguide switches, wide-band waveguiding hermetic junctions, SWF sensors, break-away connectors etc. The elements operate within the frequency range of up to 10 GHz and are structurally implemented on various types of feeder tracts such as coaxial, strip and waveguide. For calculations up-to-date software is used, it enables computer analysis and synthesis of devices designed. The elements have high reliability, small dimensions and low weight. Below is the description of various configurations of antennas and feeder tract SHF-units. Omnidirectional antennas. For the 0.3-300 Hz frequency band the electric dipole antennas are widely used as omnidirectional. For the lower frequency band section the antenna configuration with retractable electromechanic vibrator gear of up to 25 m long was developed. Self-turning vibrators of up to 8m length are also applied. For the 100-300 MHz band the V-shaped corner antenna configuration is developed$ it is intended for installation on satellite case and unfolding beams. By means of reactive elements incorporated into vibrators, dual-frequency antennas with frequency diversion of over 30% are implemented. Near-omnidirectional antennas. This type antennas form directional pattern with weak directiveness and definite form in semisphere. Antenna configurations provide system operation within P, L, S bands and are installed in AUOS-3, AUOS-C, Sich-1M, Okean, Microsatellite etc. Waveguide antennas. Wide range of waveguard antennas with various beam shape of directional pattern was developed. They are used directly for SC and LV, as well as irradiators for reflector antennas. A number of complex shape structures (reflector antennas irradiators, subdished) are manufactured using the method of galvanoplastic shaping after the Institute of Technical Mechanics of Academy of Science in the Ukraine. EXERCISE 2 жүктеу/скачать 0.79 Mb. Достарыңызбен бөлісу:
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