This is not the questio.
This is the map of "Gas purification" topic.
file topic_report.docx = 20 topics from 1201 articles which have words
ti=(gas* AND ((High Purity ) OR purif*))
in their titles (medicine/biology was removed). Each topic is represented through 20 words and 20 thrases with which it is discussed in these articles. Really this terms are the names of methods, objects, properties, laws and so on for topic in question. In addition each topic has quotes from two articles in which it is most manifested.
file a1_basic.xlsm - articles with basic knowledge on the topic
file a3_novelty.xlsm - articles of last years potentially with novelty
PS
Feel free to ask the analysis of more specific topic.
We will be grateful for the feedback.