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Adsorption and photocatalytic degradation of bisphenol A using TiO2 and its separation by submerged hollowfiber ultrafiltration membrane
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作者 jae-wook lee Tae-Ouk Kwon +1 位作者 Ramesh Thiruvenkatachari Il-Shik Moon 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第1期193-200,共8页
This study evaluates the adsorption ability ofbisphenol A(BPA) on titanium dioxide(TiO2) and its effect on the photocatalysis by advanced oxidation process using UV radiation and TiO2 photocatalyst. Degradation of... This study evaluates the adsorption ability ofbisphenol A(BPA) on titanium dioxide(TiO2) and its effect on the photocatalysis by advanced oxidation process using UV radiation and TiO2 photocatalyst. Degradation of BPA was also evaluated for the system without adsorption prior to photocatalytic reaction. The separation of TiO2 from BPA solution treated by pilot-scale photocatalytic reactor (capacity 0.16 m^3) was studied using submerged ultrafiltration (UF) membrane. It was found that although adsorption capacity of BPA was not high, adsorption played an important role in improving the efficiency ofphotocatalysis. On the other hand, during the separation of TiO2 particles from aqueous suspension, the permeate flux of the membrane was strongly affected by transmembrane pressure and TiO2 dose. The permeate turbidity was decreased below 1 NTU. 展开更多
关键词 bisphenol A TIO2 ADSORPTION MEMBRANE PHOTOCATALYSIS
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Bioinspired Multi-material Polyjet-printed Frog Robot for Synchronous and Asynchronous Swimming
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作者 Afaque Manzoor Soomro jae-wook lee +3 位作者 Fida Hussain Memon Faheem Ahmed Kashif Hussain Kyung Hyun Choi 《Journal of Bionic Engineering》 SCIE EI CSCD 2023年第3期923-933,共11页
This paper proposes the bioinspired soft frog robot. All printing technology was used for the fabrication of the robot. Polyjet printing was used to print the front and back limbs, while ultrathin filament was used to... This paper proposes the bioinspired soft frog robot. All printing technology was used for the fabrication of the robot. Polyjet printing was used to print the front and back limbs, while ultrathin filament was used to print the body of the robot, which makes it a complete soft swimming robot. Dual thrust generation approach has been proposed by embedding the main muscle and antagonistic muscle in all the limbs, which enables it to attain high speed (18 mm/s), significant control to swim in dual mode (synchronous and asynchronous modes). To achieve the swimming motion of frog, four SMA (BMF 300) muscle wires were used. The frog robot is named as (FROBOT). The hind limbs are 60 mm long and 10 mm thick on average, while the front limbs are 35 mm long and 7 mm thick. Model-based design and rigorous analysis of the dynamics of real frogs have allowed FROBOT to be developed to swim at a level that is remarkably consistent with real frogs. Electrical and mechanical characteristics have been performed. In addition, the test data were further processed using TRACKER to analyze angle, displacement and velocity. FROBOT (weighs 65 g) can swim at different controllable frequencies (0.5–2 Hz), can rotate in any direction on command from custom built LabVIEW software allowing it to swim with speed up to 18 mm/s on deep water surface (100 cm) with excellent weight balance. 展开更多
关键词 BIOINSPIRED Soft robotics FROG FROBOT Asynchronous swimming
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Numerical simulation for dendrite growth in directional solidification using LBM-CA(cellular automata)coupled method 被引量:5
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作者 Wonjoo lee Yuhyeong Jeong +4 位作者 jae-wook lee Howon lee Seong-hoon Kang Young-Min Kim Jonghun Yoon 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第14期15-24,共10页
To predict the dendrite morphology and microstructure evolution in the solidification of molten metal,numerically,lattice Boltzmann method(LBM)-cellular automata(CA)model has been developed by integrating the LBM to s... To predict the dendrite morphology and microstructure evolution in the solidification of molten metal,numerically,lattice Boltzmann method(LBM)-cellular automata(CA)model has been developed by integrating the LBM to solve the mass transport by diffusion and convection during solidification and the CA to determine the phase transformation with respect to the solid fraction based on the local equilibrium theory.It is successfully validated with analytic solutions such as Lipton-Glicksman-Kurz(LGK)model in static melt,and Oseen-Ivantsov solution under the fluid flow conditions in terms of tip radius and velocity of the dendrite growth.The proposed LBM-CA model does not only describe different types of dendrite formations with respect to various solidification conditions such as temperature gradient and growth rate,but also predict the primary dendrite arm spacing(PDAS)and the secondary dendrite arm spacing(SDAS),quantitatively,in directional solidification(DS)experiment with Ni-based superalloy. 展开更多
关键词 Cellular automata(CA) Lattice Boltzmann method(LBM) Dendritic growth Directional solidification
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