Y Geophysics,astronomy,and astrophysicsScientometrics :the internet pages of major national physical societies,scientific publishers,and industrial conference management systems. A conference was deemed appropriate for additional study if it possessed a properly defined net presence in English and a clearly identifiable hashtag or keyword that delegates may possibly reasonably employ for reside 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 utilized by the journal Physical Overview since . PACS is actually a hierarchical segregation on the entire spectrum of topic matter in physics,astronomy and particular associated fields. The scheme includes ten broad topic categories,as shown in Table ,but using a subhierarchy that contains no less than 4 levels of depth; the narrowest term in the hierarchy supplies the most detailed characterization of subject matter. Progress in indexing and searching technologies has highlighted different limitations of a scheme for example PACS,and within a new taxonomy PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/20048438 for physics was introduced: the AIP Thesaurus replaces PACS and will aid within the retrieval of scientific data. Nevertheless,for the purposes of the present study,it was concluded that the toplevel categorization of PACS as defined within the update was enough. Since my familiarity with physics just isn’t equally spread across all ACP-196 custom synthesis branches in the subject,misclassification with the key conference theme was probable. Having said that,this represented an unlikely source of error due to the fact only the broadest degree of the scheme was applied. For instance,in December a workshop (that is not a part of this evaluation) was held around the subject “Modern nuclear density functional theory and its applications”. Subjectspecific know-how might be essential to apply a narrow degree of classification for this workshop,which would be . Jz. Substantially significantly less specialist understanding is necessary so that you can classify the conference under the generic heading PACS which,as Table shows,refers towards the incredibly broad category of “Nuclear Physics”. Much with the evaluation in this paper hinges merely upon judging when the key classification of a conference is PACS or PACS ,or else if it truly is linked as an alternative with among the list of other eight PACS numbers. A note on nomenclature: in this paper,a conference classified as PACS or PACS might be denoted as an “AstroParticle” conference. The term as a result refers to a conference that involved any aspect of your physics of elementary particles and fields (PACS or of geophysics,astronomy,and astrophysics (PACS. The term “AstroParticle” ought to not be confused with the emerging subdiscipline of astroparticle physics. Any conference not in PACS or PACS is grouped within the term “Other(s)”.Conferences included within the studyOf the conferences identified within the “Identification and classification of conferences” section,seven were rejected for further evaluation. Three of those seven were rejected since,while physicists have been invited to participate,later examination showed that the focus in the conference lay outside the classification scheme becoming utilised. (Two conferences had their concentrate on scientific computing,the other solely on chemistry). A further three conferences were rejected because it proved impossible to acquire additional facts about them and thus classify them with self-confidence. These 3 conferences have been all based in China. No Twitter activity was related with t.