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RISS 인기검색어
- 검색키워드
- 저자 : Qiyun Shi (검색결과 4 건)
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Wenying Shi,Hongbin Li,Qiyun Du,Shuo Wang,Haixia Zhang,Xiaohong Qin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Carboxylated multi-walled carbon nanotubes (cMWCNTs) were incorporated in membrane matrix during the drywet spinning process to improve membrane performance. Membrane surface composition and morphology were examined by means of FTIR and SEM. The effects of cMWCNTs content on membrane surface hydrophilicity, separation performanceand dye adsorption properties were well investigated and characterized through WCA examination, the cross-flow filtration measurement and the adsorption experiment. The surface hydrophilicity, the water permeability, solute rejection and dye adsorption properties of the cMWNTs-incorporated hollow fiber membranes have been all improved. When cMWNTs content was 0.3 wt%, the cMWNTs-incorporated hollow fiber membrane obtained the obvious enhanced pure water flux (137.2 L·m-2·h-1, at 0.1 MPa) which was 1.5 times as high as that of the original PSF hollow fiber membrane. The preparedcMWCNTs-incorporated membranes are expected to be used in the treatment of textile dyeing wastewater or employed as the supports of the composite membranes.
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Wenying Shi,Tengfei Li,Hongbin Li,Qiyun Du,Haixia Zhang,Xiaohong Qin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
An integrated process of esterification with phosphotungstic acid/poly (ether sulfone) (PWA/PES) membrane,transesterification with alkalized polysulfone (APSF) membrane and Graphene Oxide/poly (vinylidenefluoride) (GO/PVDF) separation membrane was carried out to produce biodiesel from acidic oil. Atthe first step, the PWA/PES membrane was introduced to catalyze the esterification reaction. The morphology,maximum pore size, porosity and catalytic esterification performance of PWA/PES membranewere investigated. After the esterification, products and reactants without reaction were put into theGO/PVDF separation membrane to soybean oil and other substances. The permeation mixture flux andsoybean oil rejection of the GO/PVDF separation membrane is 597.89 L/m2h and 98.02%, respectively. At the second step, the APSF membrane was added to catalyze the transesterification reaction in whichthe soybean oil reacted with methanol. The results showed that the esterification conversion was 98.6%and transesterification conversion was 91.2%. The main parameters of the biodiesel product obtainedmeet the Chinese Standard (GB/T 20828) and European Standard (EN 14214).
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Image Tracking Algorithm Improvement Based on TLD Frame
Lei Yu,Tao Zheng,Qiyun Shi 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
Image target tracking is an important part in computer vision field, and has a broad application prospect in modern society. Lack of online learning function, the traditional target tracking algorithm was based on the single track as long as possible. The target deformation and occlusion will lead to target tracking lost. TLD (tracking-learning-detection) is the long-term effective algorithm in tracking single target proposed. The algorithm requires less prior knowledge and can achieve long-term tracking, but when target encounter obstacles, there will be drift phenomenon in the short term. In order to overcome this shortcoming, the paper improve the tracking module of TLD. A method is proposed by using Harris feature point instead of the original Grid sampling method. The experimental results show that this method can effectively suppress the tracking drift, and improve tracking precision.
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Hongbin Li,Wenying Shi,Shuo Mei,Jinchao Li,Qiyun Du,Longwei Qin,Haixia Zhang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Poly(p-phenylene terephthalamide) (PPTA), as the raw polymer material of Aramid fiber-1414, has high modulus and high strength which is commonly used in the reinforced composites. However, the general blending often accompany the microphase incompatibility in polymer matrix. In this study, PPTA molecules were incorporated into poly(vinylidene fluoride) (PVDF) membrane matrix through in situ polycondensation of p-phenylene diamine (PPD) and terephthaloyl chloride (TPC) in PVDF solution and PPTA/PVDF molecular composite membranes were prepared via the subsequent nonsolvent induced phase separation (NIPS) process. The anti-compaction properties of resulted PPTA/PVDF molecular composite membranes were systematically investigated including the variations of bursting pressure and membrane thickness, porosity, pure water flux under different pressures. The results suggested that membrane comprehensive anticompaction properties were improved with the increasing of PPTA content in PVDF membrane matrix. Combining the variation trends of membrane anti-compaction properties with morphologies, the compaction-deformation evolution processes of two membrane pore types (sponge-like and finger-like pores) were proposed at the end.
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