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This paper focuses on live streams as interactional phenomena from an ethnomethodology and conversation analysis (EMCA) perspective. It discusses how streamers and viewers manage attention and engagement and how noticing-based actions constitute a powerful and crucial resource to produce and display these, finely tuned to the asymmetric communicative affordances of live streams, which, in the case of expository live streams, enact a streamer on display for the perceptual consumption of remote viewers. It discusses how streamers and viewers may produce noticing sequences and noticing-based sequences. It also discusses how the orientation towards noticing in expository live streams may become contagious and lead to a 'noticing effervescence.' • Streams and streamers are oriented toward eliciting various responses from viewers. • A powerful resource for viewers to achieve engagement is to send messages designed as noticing-based actions. • Noticing-based actions index some prior perceptual realization regarding features or events in the stream. • Noticing-based action implies that what is treated as noticeable is deeply embedded in message designs. • Such an action format casts viewers as onlookers, framing the streaming activity as a spectacle. [ABSTRACT FROM AUTHOR]

The possibility of coalescence between rolling and static droplets is greater than that of static droplets. Due to the randomness of the velocity direction of rolling droplets and the position of static droplets, rolling and static droplets are more prone to non-frontal coalescence. Most studies focused on static droplets or head-on coalescence jumping, while non-frontal coalescence is poorly understood. In this work, we experimentally and numerically study the head-on and non-frontal coalescence of a rolling droplet and a static one. Furthermore, to measure the jumping characteristics of merged droplets, a "single camera defocusing imaging measurement" (SCDIM) method was proposed to obtain a 3D trajectory of the jumping droplet. For non-frontal coalescence, the morphological evolution of the merged droplet rotates counterclockwise during the coalescence process. The direction of horizontal jumping velocity deviates towards the rolling droplet. The non-frontal deviation and initial velocity determine whether rotation can occur and its strength. The higher initial velocity has a negative impact on the jumping velocity in the Z direction with the increase of non-frontal deviation, while the deviation angle could be negligible. As the non-frontal deviation ratio increases, the dominant mechanism of coalescence jumping is gradually transferred from the impact effect to the contraction of the merged droplets. Different from jumping velocity in the Z direction, the horizontal jumping velocity is approximately proportional to the dimensionless initial velocity. [Display omitted] [ABSTRACT FROM AUTHOR]