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      • KCI등재

        Preparation and Properties of the Fast-Curing γ-Ray-Shielding Materials Based on Polyurethane

        Minxuan Ni,Xiaobin Tang,Hao Chai,Yun Zhang,Tuo Chen,Da Chen 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.6

        In this study, fast-curing shielding materials were prepared with a two-component polyurethane matrix and a filler material of PbO through a one-step, laboratory-scale method. With an increase in the filler content, viscosity increased. However, the two components showed a small difference. Curing time decreased as the filler content increased. The minimum tack-free time of 27 s was obtained at a filler content of 70 wt%. Tensile strength and compressive strength initially increased and then decreased as the filler content increased. Even when the filler content reached 60 wt%, mechanical properties were still greater than those of the matrix. Cohesional strength decreased as the filler content increased. However, cohesional strength was still greater than 100 kPa at a filler content of 60 wt%. The γ-ray-shielding properties increased with the increase in the filler content, and composite thickness could be increased to improve the shielding performance when the energy of γ-rays was high. When the filler content was 60 wt%, the composite showed excellent comprehensive properties.

      • KCI등재

        Fabricated superhydrophobic three-dimensional rambutan-like-β- NiOOH @sponge skeletons for multitasking oil–water separation

        Minxuan Li,Xu Xu,Lei Zhang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

        In this paper, oleophilic and superhydrophobic sponges were successfully constructed via a one-pot lowtemperature hydrothermal method anchoring three-dimensional rambutan-like-β-NiOOH microspheresinto sponge skeletons and lauric acid modification. The constructed modified three-dimensionalrambutan-like-β-NiOOH @sponge (the static contact angle of 153.5 ) possessed outstanding oil sorptioncapacity (separation efficiency is nearly 99%) towards the various organics/oils and excellent recyclabilityafter 30 cycles of adsorption-squeezing. Importantly, modified three-dimensional rambutan-like-β-NiOOH @sponge is capable of separating surfactant-stabilized water-in-oil emulsions and can be utilizedfor continuous oil-water separation with the aid of a peristaltic pump. This is mainly due to the fact thatthe three-dimensional hierarchical rambutan-like micronano structure formed by self-assembly withhigh specific surface area provides a large number of hydrophobic interfaces to improve the hydrophobicproperties of sponges. This work presents a new strategy for the designs multitasking oil-waterseparation materials.

      • KCI등재

        Fabricated smart sponge with switchable wettability and photocatalytic response for controllable oil-water separation and pollutants removal

        Xu Xu,Minxuan Li,Xiang Li,Lei Zhang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-

        Stimuli-responsive materials with the controllable oil-water separation and water further purificationabilities show great potential in practical applications. In this paper, a highly effective and eco-friendlysmart pH-responsive melamine sponge with switchable wettability and photocatalytic activity wasprepared via anchoring three-dimensional cell-like BiOCl microspheres into sponge skeletons and beingmodified by dodecanedioic acid and lauric acid. The obtained sponge shows rapidly switchablewettability and can separate various oil/water mixtures with high efficiency up to 99%. Moreover, the aspreparedsmart sponge also demonstrates reliable photocatalytic ability and could remove the solublepollutants (such as methylene blue and Sudan III) under visible light as well as UV light (degradationefficiency around 100%). Besides, the smart pH-responsive material showed satisfactory reusability andstability. This smart multifunctional material has outstanding potential in water resource purification.

      • KCI등재

        CAWR: Buffer Replacement with Channel-Aware Write Reordering Mechanism for SSDs

        Ronghui Wang,Zhiguang Chen,Nong Xiao,Minxuan Zhang,Weihua Dong 한국전자통신연구원 2015 ETRI Journal Vol.37 No.1

        A typical solid-state drive contains several independent channels that can be operated in parallel. To exploit this channel-level parallelism, a variety of works proposed to split consecutive write sequences into small segments and schedule them to different channels. This scheme exploits the parallelism but breaks the spatial locality of write traffic; thus, it is able to significantly degrade the efficiency of garbage collection. This paper proposes a channel-aware write reordering (CAWR) mechanism to schedule write requests to different channels more intelligently. The novel mechanism encapsulates correlated pages into a cluster beforehand. All pages belonging to a cluster are scheduled to the same channels to exploit spatial locality, while different clusters are scheduled to different channels to exploit the parallelism. As CAWR covers both garbage collection and I/O performance, it outperforms existing schemes significantly. Trace-driven simulation results demonstrate that the CAWR mechanism reduces the average response time by 26% on average and decreases the valid page copies by 10% on average, while achieving a similar hit ratio to that of existing mechanisms.

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