Y Geophysics,astronomy,and astrophysicsScientometrics :the internet pages of main national physical societies,scientific publishers,and industrial conference management systems. A conference was deemed appropriate for additional study if it possessed a effectively defined web presence in English and a clearly identifiable hashtag or keyword that delegates may well reasonably employ for live tweeting. In total,conferences were identified. The conferences have been classified in line with the Physics and Astronomy Classification Scheme (PACS) as developed by the American Institute of Physics (AIP) and utilised by the journal Physical Overview since . PACS is really a hierarchical segregation on the complete spectrum of topic matter in physics,astronomy and particular connected fields. The scheme contains ten broad subject categories,as shown in Table ,but using a subhierarchy that contains no less than 4 levels of depth; the narrowest term within the hierarchy provides one of the most detailed characterization of topic matter. Progress in indexing and browsing technologies has highlighted various limitations of a scheme such as PACS,and inside a new taxonomy PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/20048438 for physics was introduced: the AIP Thesaurus replaces PACS and can aid in the retrieval of scientific information. Nevertheless,for the purposes with the present study,it was concluded that the toplevel categorization of PACS as defined inside the update was adequate. Since my familiarity with physics isn’t equally spread across all branches with the topic,misclassification from the main conference theme was probable. Nevertheless,this represented an unlikely source of error considering that only the broadest degree of the scheme was made use of. For example,in December a workshop (which is not part of this analysis) was held around the subject “Modern nuclear density functional theory and its applications”. Subjectspecific know-how may be essential to apply a narrow amount of classification for this workshop,which would be . Jz. Much less specialist knowledge is required so as to classify the conference below the generic heading PACS which,as Table shows,refers towards the pretty broad category of “Nuclear Physics”. Much in the evaluation in this paper hinges merely upon judging if the key classification of a conference is PACS or PACS ,or else if it’s connected as an alternative with among the other eight PACS numbers. A note on nomenclature: in this paper,a conference classified as PACS or PACS is going to be denoted as an “AstroParticle” conference. The term thus refers to a conference that involved any aspect on the physics of elementary particles and fields (PACS or of geophysics,astronomy,and astrophysics (PACS. The term “AstroParticle” should not be confused with all the emerging subdiscipline of buy AZD3839 (free base) AstroParticle physics. Any conference not in PACS or PACS is grouped inside the term “Other(s)”.Conferences integrated inside the studyOf the conferences identified in the “Identification and classification of conferences” section,seven were rejected for further analysis. 3 of these seven had been rejected due to the fact,though physicists have been invited to participate,later examination showed that the concentrate from the conference lay outside the classification scheme becoming utilised. (Two conferences had their focus on scientific computing,the other solely on chemistry). A additional 3 conferences had been rejected because it proved impossible to get extra information about them and therefore classify them with confidence. These three conferences were all based in China. No Twitter activity was linked with t.