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Mainland: This study investigates the intermedia agenda-setting (IAS) relationships among major newspapers in Hong Kong, the U.S. and mainland China concerning the 2019 anti-extradition bill protests. It builds on the protest paradigm to characterize the news attributes adopted by leading media outlets and examined the transfer of attribute agendas at both regional and international levels. A total of 9,646 news items were content analyzed. Granger causality tests revealed that mainland Chinese media were the primary agenda-setter among the three, contrary to previous findings that media agendas mostly flow from the U.S. to other countries. Hong Kong newspapers exerted a bottom-up influence on their U.S. counterparts, setting the attribute agenda regarding Chinese authority and international society. A breakdown of the Hong Kong press into three political camps showed diverse IAS relationships. The findings testify to the co-existence of dominant flows and contra-flows in regional and international news flows and imply that organizational and socio-cultural factors can potentially influence IAS. [ABSTRACT FROM AUTHOR]

Metal single-atom catalysts have attracted widespread attention in the field of lithium-oxygen batteries due to their unique active sites, high catalytic selectivity, and near total atomic utilization efficiency. Isolated metal atoms not only serve as the active sites themselves, but also function as modulators, reversely regulating the surface electronic structure of the support to enhance its inherent electrocatalytic activities. Despite the potential of isolated metal atom-driven active sites, understanding the structure-activity relationship remains a challenge. In this study, we present a ruthenium single-atom doping-driven cost-effective and durable tricobalt tetroxide electrocatalyst with excellent oxygen electrode electrocatalytic activity. The lithium-oxygen battery with this catalyst as the oxygen electrode demonstrates high performance, achieving a capacity of up to 25 000 mA h g -1 and maintaining good stability over 400 cycles at a current density of 100 mA g -1 . This improvement is attributed to the exquisite control of the morphology and structure of the discharge product, lithium peroxide. The aresults of physical characterization and theoretical calculations reveal that isolated ruthenium atoms bond with the tetrahedral cobalt site, resulting in spin polarization enhancement and rearrangement of d orbital energy levels in cobalt. This rearrangement reduces the d z 2 orbital occupancy and promotes their transfer to the octahedral cobalt site, thereby enhancing its adsorption capacity for the oxygen-containing intermediates, and ultimately increasing the electrocatalytic activity of the oxygen evolution reaction. This work presents an innovative strategy to regulate the catalytic activity of metal oxides by introducing another metal single atom.