Marina Joubert, Rodrigo Costas,
... identities, characteristics and activities of South African science tweeters (or ZA science tweeters)—i.e. Twitter users in South Africa who ... research articles. The growing number of ZA science tweeters, both overall and in relative terms, suggests that ... to share and discuss scientific outputs. ZA science tweeters are actively contributing to the sharing of information ... users comes from a small number of active tweeters, and only 1% of ZA science tweeters had more than 20,000 followers. About 6.6% of ZA science tweeters are scholars (or researchers) themselves. Compared to science ...
Tópico(s): Social Media in Health Education
2019 - | Journal of Altmetrics
Houqiang Yu, Tingting Xiao, Shenmeng Xu, Yuefen Wang,
... potential societal impact of scientific products, but scientific tweeters who produce the Twitter altmetrics data have not ... The study, by analyzing 2.63 million scientific tweeters' data that are extracted from the Altmetric.com ... of their account types and identities, 1468 scientific tweeters of different levels of activeness are sampled for ... The extent to which a small proportion of tweeters have posted most of scientific tweets increases over time. In 2016, 10% of scientific tweeters have posted 80% of scientific tweets; (2) Scientific ...
Tópico(s): Complex Network Analysis Techniques
2019 - Elsevier BV | Journal of Informetrics
Peter J. Hampton, Rodolphe Conan, Colin Bradley, Pan Agathoklis,
... University of Victoria is to prove the Woofer Tweeter concept for use in instruments for the Thirty ... the temporal and spatial domains. The other DM (Tweeter) is capable of the high temporal and spatial ... speed of the Woofer is incorporated into the Tweeter controller in order to allow for appropriate offloading from the Tweeter to the Woofer. In order to determine which Tweeter shapes must compensate for the slower Woofer and ...
Tópico(s): Adaptive optics and wavefront sensing
2006 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
... use of Twitter. Who are the active j-tweeters, and how do they use Twitter? And how do j-tweeters deviate from other journalists concerning professional practices and ... norms and values between the most active j-tweeters and their colleagues concerning the “Twitter-specific” features ... the other hand, as the most active j-tweeters do not deviate on core professional values, it ... newsrooms, the views held by the active j-tweeters could lead to a new professional view on ...
Tópico(s): Public Relations and Crisis Communication
2014 - Taylor & Francis | Digital Journalism
... more frequently mentioned by either male or female tweeters were coded according to the usernames’ stance in ... The results indicate that overall male and female tweeters use very similar language in their tweets, but ... the use of hashtags and usernames, with female tweeters mentioning significantly more campaigns and organizations with a ... towards anthropogenic impact on climate change, while male tweeters mention significantly more private persons and usernames with ... female and male audiences on Twitter. While female tweeters can be targeted via local campaigns and news ...
Tópico(s): Media Studies and Communication
2015 - Emerald Publishing Limited | Internet Research
Ramakanth Kavuluru, A. K. M. Sabbir,
... themes when compared with other Twitter users (or tweeters). Using a dataset of 1000 independently annotated Twitter ... of textual features from latest tweet content and tweeter profile biography to build predictive models to automatically identify proponent tweeters. We used a set of manually curated key ... compared the results with those generated by regular tweeters. Our model identifies e-cig proponents with 97% ... intervals. We find that as opposed to regular tweeters that form over 90% of the dataset, e- ...
Tópico(s): Media Studies and Communication
2016 - Elsevier BV | Journal of Biomedical Informatics
Tao Cheng, Wenjin Liu, Boqing Pang, Ping Yang, Bing Xu,
... the dual deformable mirrors (DMs) in a woofer–tweeter adaptive optics system. This algorithm can directly use ... to woofer DM and the remaining aberration to tweeter DM through the slope-based orthogonal basis. At ... opposite compensation, a constraint matrix used to reset tweeter control vector is convenient to be calculated with ... of woofer DM and release the stroke of tweeter DM to compensate high-order aberration. More importantly, ... not need to measure the accurate shape of tweeter's influence function and keeps better performance of ...
Tópico(s): Optical measurement and interference techniques
2018 - IOP Publishing | Chinese Physics B
Peter J. Hampton, Pan Agathoklis, Rodolphe Conan, Colin Bradley,
... wavelet-based phase reconstruction technique and a woofer-tweeter controller is presented. The wavelet-based reconstruction technique ... The controller configuration is based on the woofer-tweeter controller to control low- and high-spatial-frequency aberrations, respectively. The separation of the woofer and tweeter signals is done using a computationally efficient method ... of the wavelet-based phase reconstruction and woofer-tweeter controller leads to very good results with respect ...
Tópico(s): Optical Systems and Laser Technology
2010 - Optica Publishing Group | Journal of the Optical Society of America A
Carlos Correia, Henri-François Raynaud, Caroline Kulcsár, Jean‐Marc Conan,
The woofer-tweeter concept in adaptive optics consists in correcting for the turbulent wavefront disturbance with a combination of two deformable ... spatially low-frequency, large-amplitude disturbances, whereas the tweeter is generally its complement, i.e., corrects for ... minimum-variance solution for the double stage woofer-tweeter concept in adaptive optics systems is addressed using ... temporal dynamics that accommodates a double-stage woofer-tweeter DM. Monte Carlo simulations are run for a ...
Tópico(s): Advanced optical system design
2010 - Optica Publishing Group | Journal of the Optical Society of America A
Carlos Correia, Jean‐Pierre Véran,
... stroke woofer and a high-bandwidth low-stroke tweeter is used in a so-called woofer-tweeter architecture. The optimal (minimum residual phase variance) way ... split the correction between the woofer and the tweeter in the context of a linear-quadratic-Gaussian ( ... fold the temporal characteristics of the woofer and tweeter into the LQG controller significantly increases its complexity. ...
Tópico(s): Advanced Image Processing Techniques
2012 - Optica Publishing Group | Optics Letters
Jenine K. Harris, Sarah Moreland‐Russell, Rachel G. Tabak, Lindsay R. Ruhr, Ryan Maier,
... the hashtag #childhoodobesity. Tweets were coded for content; tweeters were classified by sector and health focus. Data ... on the network of follower connections among the tweeters. We used descriptive statistics and exponential random graph modeling to examine tweet content, characteristics of tweeters, and the composition and structure of the network of connections facilitating communication among tweeters.We collected 1110 tweets originating from 576 unique ... than environment or policy. Few government and educational tweeters were in the network, but they were more ...
Tópico(s): Social Media and Politics
2014 - American Public Health Association | American Journal of Public Health
... the sub-flow formed a separate community of tweeters that did not overlap with tweeters participating in the original campaign. Twitter campaigns have ... the shared issues and around the communities of tweeters. Our results show that using information spreading approach ... Twitter. Thus, our results suggest that although different tweeters participated in the two separate campaigns using shared ... se do not always indicate shared communities of tweeters nor can they always be considered as indicators ...
Tópico(s): Digital Marketing and Social Media
2016 - SAGE Publishing | SAGE Open
Maggie Boyraz, Aparna Krishnan, Danielle Catona,
... study analyzed the features of the top 30 tweeters and top 30 retweeted users during the 2011 ... followers positively impacted retweetability. Power users or those tweeters sending the most messages were more likely to ... government, characteristics of the source differentiated the top tweeters from the top retweeted users.
Tópico(s): Opinion Dynamics and Social Influence
2015 - Taylor & Francis | Atlantic Journal of Communication
Paul Chappell, Ying Kei Tse, Minhao Zhang, Susan R. Moore,
... The method involves the identification of a given tweeter’s likely location of residence from the ‘geo- ... of geodemographics for discerning between different types of tweeters is problematic in some ways, but that the general process of classifying tweeters according to their position in geographical space is ... new method for discerning the social position of tweeters. Further research is required in this area, as ...
Tópico(s): Data-Driven Disease Surveillance
2017 - SAGE Publishing | Sociological Research Online
Kjetil Søreide, Graham Mackenzie, Karol Połom, Laura Lorenzon, Helen Mohan, Julio Mayol,
... on individual tweets and retweets, including date and tweeter or retweeter were collected using NodeXL, FollowTheHashtag, Twitonomy ... 10–13 October) documented 328 tweets by 58 tweeters with 1167 retweets, with a soaring activity and ... The nodal network of tweets, the most active tweeters and retweeters are presented as well as the ... growth in just over a week.ConclusionsActivity on tweeter during the conference was considerable, with a potential ...
Tópico(s): Radio, Podcasts, and Digital Media
2018 - Elsevier BV | European Journal of Surgical Oncology
Graham Mackenzie, Kjetil Søreide, Karol Połom, Laura Lorenzon, Helen Mohan, Delia Cortés‐Guiral, Julio Mayol,
... tweets posted using the #ESSO39 hashtag by 64 tweeters. However, extending the analysis to include responses that ... at the conference, and only 49% of the tweeters posting content or quoted in tweets. Based on ... simply on the conference hashtag (#ESSO39). Mentioning another tweeter(s) in a tweet or response was associated ... should include the conference hashtag and mention other tweeters in their tweets and responses. Searching for tweets ...
Tópico(s): Health Literacy and Information Accessibility
2020 - Elsevier BV | European Journal of Surgical Oncology
Piiastiina Tikka, Harri Oinas‐Kukkonen,
... health. We studied the effect of participation style (tweeters vs. non-tweeters) on perceived health behavior change through the constructs “ ... were given a basic health message, and the tweeters were then asked to actively search, think up, and share tips and guidance with non-tweeters. Results indicate that for both tweeters and non-tweeters, efficacy and social influence were positively related, but ... behavior change are only positively related for non-tweeters. From this, we concluded that participation style can ...
Tópico(s): Digital Marketing and Social Media
2017 - Springer Science+Business Media | Personal and Ubiquitous Computing
Katie M. Morzinski, Bruce Macintosh, Donald T. Gavel, Daren Dillon,
... Imager, an upcoming "extreme" AO instrument. High-order "tweeter" and low-order "woofer" deformable mirrors (DMs) will ... crucial in this regard that the high-density tweeter, a micro-electrical mechanical systems (MEMS) DM, have ...
Tópico(s): Optical Systems and Laser Technology
2009 - Optica Publishing Group | Optics Express
Jean‐François Lavigne, Jean‐Pierre Véran,
... two deformable mirrors (DMs), the woofer and the tweeter. We first present a method to specify the ... correction of the woofer DM for a given tweeter stroke requirement using an analytical and Monte Carlo ...
Tópico(s): Optical Systems and Laser Technology
2008 - Optica Publishing Group | Journal of the Optical Society of America A
Chaohong Li, Nripun Sredar, Kevin M. Ivers, Hope M Queener, Jason Porter,
... control two deformable mirrors (DMs) in a woofer-tweeter adaptive optics system. A global response matrix was ... This method can be applied to any woofer-tweeter AO system.
Tópico(s): Optical Coherence Tomography Applications
2010 - Optica Publishing Group | Optics Express
Weiyao Zou, Xiaofeng Qi, Stephen A. Burns,
... least-squares (DLS) control algorithm in a woofer-tweeter dual deformablemirror (DM) adaptive optics scanning laser ophthalmoscope ( ... and small-amplitude higher-order aberrations by a tweeter DM.We measured the in vivo performance of ...
Tópico(s): Glaucoma and retinal disorders
2011 - Optica Publishing Group | Biomedical Optics Express
... based damped least-squares control algorithm for woofer-tweeter (W-T) dual deformable-mirror (DM) adaptive optics ( ... the high-stroke, low-order aberrations, and the tweeter DM correcting the low-stroke, high-order aberrations. ...
Tópico(s): Optical Wireless Communication Technologies
2012 - Optica Publishing Group | Applied Optics
Sang-Moon Hwang, Hong-Joo Lee, Ji Hoon Kim, Joong-Hak Kwon, Keum‐Shik Hong, Gun-Yong Hwang,
... is to integrate two-way microspeakers (woofer and tweeter) within one device sharing not only magnetic circuit ... hi-fi microspeaker with a woofer and a tweeter is introduced and the sound pressure level is ...
Tópico(s): Speech and Audio Processing
2005 - American Institute of Physics | Journal of Applied Physics
Alireza Jalali, Timothy J. Wood,
... largest meeting of this type in Canada. Are tweeters chatting about medical education topics related to the ... This analysis generated 3090 tweets from 288 different tweeters. These tweets included 1569 regular tweets, 1160 retweets, ... by the largest numbers of the 288 contributors (Tweeters). #MedEd was used by 119 (41.3%) contributors, ...
Tópico(s): Web and Library Services
2013 - Wiley | Medical Education
Wenjin Liu, Lizhi Dong, Ping Yang, Xiang Lei, Hu Yan, Bing Xu,
... woofer) and the other with high spatial resolutions (tweeter). The algorithm works as follows: wavefront gradient vector ... the same time the control vector for the tweeter is reset by a constraint matrix in order ... significantly suppress the coupling between the woofer and tweeter.
Tópico(s): Optical Wireless Communication Technologies
2013 - Optica Publishing Group | Optics Express
... notably email listservs. Findings show that Global Frackdown tweeters engage in framing practices of movement convergence and ... and multilingual tweeting. In contrast to Global Frackdown tweeters’ use of the platform for in-the-moment ... often personalized, transnational framing practices of Global Frackdown tweeters support core organizers’ goal of promoting the globalness ...
Tópico(s): Public Relations and Crisis Communication
2015 - SAGE Publishing | Social Media + Society
Liang Zhao, Jia Jia, Ling Feng,
... work mainly rely on tweeting contents to detect tweeters’ psychological stress. However, a tweet is limited to ... provide enough information to accurately figure out its tweeter’s stress. To overcome the limitation, this paper proposes to leverage details of social interactions between tweeters and their following friends (i.e., time-sensitive ...
Tópico(s): Digital Mental Health Interventions
2015 - Springer Science+Business Media | IFIP advances in information and communication technology
... and action. Analyses of linguistic markers suggested public tweeters used more cognitive complexity in their language than private tweeters. Profile analyses showed that compared to controls, only public tweeters showed decreasing negative affect and increasing psychological well‐ ...
Tópico(s): Impact of Technology on Adolescents
2015 - Wiley | British Journal of Social Psychology
... for games between retweeters. Further, games between original tweeters and retweeters are analyzed using a “tit-for- ... this paper examines a game between an original tweeter and a retweeter for the problem of retweet ... and explaining the empirical and anecdotal behavior of tweeters and retweeters using social exchange theory and game ...
Tópico(s): Social Media and Politics
2015 - Elsevier BV | International Journal of Human-Computer Studies
... content and sentiment of the tweets sent by tweeters that were identified as unconvinced or as convinced ... change science is, however, challenged by some unconvinced tweeters who tend to use more negative words in ... IPCC report in relation to different groups of tweeters. We identify how certain words may be given ...
Tópico(s): Opinion Dynamics and Social Influence
2016 - University of Illinois at Chicago | First Monday