Ionogels
are ideal candidate materials for flexible sensors, but
their stretchability and fatigue resistance are limited. Herein, highly
stretchable, fatigue-resistant, electrically conductive, and temperature-tolerant
ionogels are investigated and further applied in fabricating high-performance
flexible sensors. The ionogels consist of a poly(acrylic acid) (PAA)
network and a commonly used room-temperature ionic liquid (RTIL) named
1-ethyl-3-methylimidazolium dicyanamide ([EMIm][DCA]). Dually acrylated
Pluronic F127 (F127DA) was utilized to cross-link the PAA network,
and [EMIm][DCA] was physically confined in the PAA network. Because
of their special cross-linking structure, the PAA ionogels are highly
stretchable (>850%), tough, and fatigue-resistant, and they are
also
conductive, transparent, and temperature-tolerant because of the existence
of [EMIm][DCA]. On the basis of their integrated performances, the
PAA ionogels were further utilized to fabricate strain sensors and
pressure sensors. The ionogel-based strain sensors have high sensitivity,
low response time (200 ms), wide strain-sensing range (0–750%),
excellent durability (>1400 cycles), and good temperature tolerance
and can be applied to detect various human motions. The pressure sensors
also have a high response speed (256 ms) and excellent sensitivity
(GF = 0.73 kPa–1), which offers an opportunity to
detect force generated by finger touching and water droplets.
Abstract. Recent research in video retrieval has focused on automated, highlevel feature indexing on shots or frames. One important application of such indexing is to support precise video retrieval. We report on extensions of this semantic indexing on news video retrieval. First, we utilize extensive query analysis to relate various high-level features and query terms by matching the textual description and context in a time-dependent manner. Second, we introduce a framework to effectively fuse the relation weights with the detectors' confidence scores. This results in individual high level features that are weighted on a per-query basis. Tests on the TRECVID 2005 dataset show that the above two enhancements yield significant improvement in performance over a corresponding state-of-the-art video retrieval baseline.
Recyclable, stretchable, conductive and photoluminescent double network hydrogels are fabricated and utilized in flexible resistive-type strain sensors.
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