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Explanatory Notes

1) laser (acronym from Light Amplification by Stimulated Emission of Radiation) – a device for the creation, amplification, and transmission of a narrow, intense beam of coherent light.

2) plasma – a state of matter similar to gas in which a certain portion of the particles are ionized.

Section 1 text comprehension questions

1.1. Issues for Discussion

  1. What is proposed as a means of controlling the envelope propagation velocity of a laser pulse in a plasma?

  2. Characterise a superluminous pulse as viewed by the authors of the article.

  3. Under what conditions does the acceleration of the group velocity of a superluminous laser pulse become possible?

  4. What scientific theories serve as the basis of the hypothesis suggested?

  5. What physical property of the pulse predetermines the fact that the phase velocity of the accelerating field will be at the design speed in an active-plasma medium?

  6. What is the role of the preexcited active medium in increasing the overall pulse speed and which components of the pulse structure are affected by it?

  7. Why is the acceleration of the group velocity said not to violate the theory of relativity?

  8. Which element of the pulse structure already contains information about the pulse and in what way is this information extracted?

  9. Under what physical condition will the peak of the pulse travel to the edge of the pulse?

  10. What are the three main spheres of application of the process of effective acceleration of the photon group velocity and the recovery of laser energy loss by the active medium? Comment on each of them.

  11. Enumerate and disclose the essence of the three conditions to be met to accelerate the pulse envelope to the design speed and retain a stationary structure.

Section 2

Vocabulary focus

2.1. Stratification of the Scientific Text Vocabulary

  1. Identify special physical terms expressed by individual lexemes and sort them out according to their part-of-speech belonging. Classify them thematically into the groups of terms: a) denoting and characterizing physical processes and notions; b) denoting physical magnitudes, states and parametres; c) mathematical notions; d) others.

  2. What word-building means underlie the formation of special terminological lexemes in the text?

  3. Provide examples of derivational series of words comprising different parts of speech with the same root-morpheme. State to which lexical layer they refer.

  4. What word-combinations can be regarded as terms of physical science?

  5. Select general scientific terms used in the present text.

  6. Find instances of consubstantial terms and provide your explanations why you refer them to this group of terms.

  7. What individual lexemes represent the general scientific layer and what communicative-pragmatic functions do they perform in the present text?

  8. Identify general scientific units with the structure of a word-combination and sort them out according to their structure.

  9. Are there any general scientific units in the text expressed by predicative segments? If so, comment on their functions in the present text.

  10. Comment on the meanings of the verbs come, say, obtain and meet in general literary language and compare them with the general scientific meanings they acquire in the text. You may make use of any explanatory dictionary and dictionaries of scientific terminology, e.g. Longman Dictionary of Scientific Usage by A. Godman and E.M.F. Payne.

  11. What means of quantitative expressivity is the present text characterised by? Comment on the instances of their use.

  12. Pick out those special terms and general scientific units whose meanings are based on metaphorical transference. Does their imagery increase the expressivity of the present text?

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