166 research outputs found
Deciphering the 2016 U.S. Presidential Campaign in the Twitter Sphere: A Comparison of the Trumpists and Clintonists
In this paper, we study follower demographics of Donald Trump and Hillary
Clinton, the two leading candidates in the 2016 U.S. presidential race. We
build a unique dataset US2016, which includes the number of followers for each
candidate from September 17, 2015 to December 22, 2015. US2016 also includes
the geographical location of these followers, the number of their own followers
and, very importantly, the profile image of each follower. We use individuals'
number of followers and profile images to analyze four dimensions of follower
demographics: social status, gender, race and age. Our study shows that in
terms of social influence, the Trumpists are more polarized than the
Clintonists: they tend to have either a lot of influence or little influence.
We also find that compared with the Clintonists, the Trumpists are more likely
to be either very young or very old. Our study finds no gender affinity effect
for Clinton in the Twitter sphere, but we do find that the Clintonists are more
racially diverse.Comment: 4 pages, to appear in the 10th International AAAI Conference on Web
and Social Medi
Metamaterial absorber integrated microfluidic terahertz sensors
Spatial overlap between the electromagnetic fields and the analytes is a key factor for strong light-matter interaction leading to high sensitivity for label-free refractive index sensing. Usually, the overlap and therefore the sensitivity are limited by either the localized near field of plasmonic antennas or the decayed resonant mode outside the cavity applied to monitor the refractive index variation. In this paper, by constructing a metal microstructure array-dielectric-metal (MDM) structure, a novel metamaterial absorber integrated microfluidic (MAIM) sensor is proposed and demonstrated in terahertz (THz) range, where the dielectric layer of the MDM structure is hollow and acts as the microfluidic channel. Tuning the electromagnetic parameters of metamaterial absorber, greatly confined electromagnetic fields can be obtained in the channel resulting in significantly enhanced interaction between the analytes and the THz wave. A high sensitivity of 3.5 THz/RIU is predicted. The experimental results of devices working around 1 THz agree with the simulation ones well. The proposed idea to integrate metamaterial and microfluid with a large light-matter interaction can be extended to other frequency regions and has promising applications in matter detection and biosensing
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