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Xia Wang,Changcun Wu,Jun Sun,Chuanxiang Qin,Jianjun Wang,Qiqi Zhuo,Lixing Dai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
This study introduces a facile method to prepare syndiotactic poly(vinyl alcohol) (s-PVA) fibers containing singlewalledcarbon nanotubes (SWNTs) from the corresponding composite dispersions with tea polyphenols (TP) as dispersantunder high-speed shear flow. The formation of the composite fibrous precipitates at high shear rate is largely facilitated by theSWNTs in the dispersions and slight flow resistance. Interestingly, the obtained s-PVA/SWNTs composite precipitatespossess a three-level hierarchical structure, that is, a single fiber is assembled by fibrils which are composed of microfibrils ofs-PVA-coated SWNTs. And the s-PVA fibrous precipitates containing high amounts of SWNTs could be obtained by shearingthe dispersion with relatively low SWNTs loadings, as a result, the composite fiber containing 20.7 wt% SWNTs wasprepared from the dispersion with 10.0 wt% SWNTs. In addition, with the increase of SWNTs loadings, the amount of theprecipitates increases, but crystallinity of the precipitates decreases instead.
Minimum Data-Latency-Bound <tex> $k$</tex>-Sink Placement Problem in Wireless Sensor Networks
Donghyun Kim,Wei Wang,Sohaee, N.,Changcun Ma,Weili Wu,Wonjun Lee,Ding-Zhu Du IEEE 2011 IEEE/ACM transactions on networking Vol.19 No.5
<P>In this paper, we propose a new multiple-sink positioning problem in wireless sensor networks to best support real-time applications. We formally define this problem as the <I>k</I> -Sink Placement Problem (<I>k</I> -SPP) and prove that it is APX-complete. We show that an existing approximation algorithm for the well-known <I>k</I>-center problem is a constant factor approximation of <I>k</I> -SPP. Furthermore, we introduce a new greedy algorithm for <I>k</I>-SPP and prove its approximation ratio is very near to the best achievable, 2. Via simulations, we show our algorithm outperforms its competitor on average.</P>