A corpus-based study of depressive language in online teen health communications

This paper presents a multidisciplinary study by using a corpus linguistic approach to investigate the topic of teen depression in an online discussion forum. The lexico- grammatical and semantic patterns of keywords in 129 online posts are explored, and five keywords (i.e. ‘have’, ‘feel’, ‘know’, ‘want’ and ‘really’) are chosen for investigation. The results suggest that those posts are characterised by recurring expressions associated with intense emotions, which indicate this group’s vulnerable mental state in relation to social contexts (e.g. family, school or relationship), and the semantic prosody of the text excerpts examined is predominantly negative (e.g. ‘I feel so alone and angry’). The findings shed light on the use of language expressions in a unique discourse of online health communications. (120 words

Anderson Impurity in Helical Metal

We use a trial wave function to study the spin-1/2 Kondo effect of a helical metal on the surface of a three-dimensional topological insulator. While the impurity spin is quenched by conduction electrons, the spin-spin correlation of the conduction electron and impurity is strongly anisotropic in both spin and spatial spaces. As a result of strong spin-orbit coupling, the out-of-plane component of the impurity spin is found to be fully screened by the orbital angular momentum of the conduction electrons.Comment: The published versio