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Baosheng Shen,Chunxiao Du,Wei Wang,Dan Yu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
With the increasingly serious water pollution and human health problems caused by oily wastewater, the task ofdeveloping new and efficient oil-water separation materials is becoming urgent. Electrospun nanofiber membranes have beenapplied to this field due to their high porosity and uniform pore size, but the preparation and mechanism of hydrophilicnanofiber membranes, which can be used in the part of underwater oleophobicity still need to be explored. Herein, we firstlyprepare nanofiber membranes containing sulfhydryl groups on the surface by electrostatic spinning of polyacrylonitrile and γ-mercaptopropyltriethoxysilane together, which becomes active sites for the grafting of dimethyldiallylammonium chloridemonomers by thiol-ene click chemistry. The resulting modified membranes exhibited hydrophilicity in air and oleophobicityin water, and demonstrated good emulsion separation performance of extremely high permeation flux (742.6 L/(m2·h)),excellent separation efficiency (>96 %), as well as outstanding antifouling performance thanks to the existence of hydrationlayer on the membrane when underwater. In addition, the membranes can maintain stable hydrophilicity and underwateroleophobicity in complex environments, and display good acid and alkali resistance.
Review : Novel Properties for Endoglucanase Acquired by Cell-Surface Display Technique
( Baosheng Shi ),( Xiaojing Ke ),( Hongwei Yu ),( Jing Xie ),( Yingmin Jia ),( Runfang Guo ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.11
In order to improve the stability of endoglucanase under thermal and acidic conditions, the endoglucanase gene was fused to the N-terminus of the Saccharomyces cerevisiae pir gene, encoding the cell wall protein PIR. The fusion gene was transformed into Pichia pastoris GS115 for expression. A resulting strain with high expression and high activity was identified by examining resistance to Geneticin 418, Congo red staining, and quantitative analysis of enzyme activity. SDS-PAGE analysis revealed that the endoglucanase was successfully displayed on the yeast cell surface. The displayed endoglucanase (DEG) showed maximum activity towards sodium carboxyl methyl cellulose at approximately 275 IU/g cell dry weight. DEG exhibited greater than 60% residual activity in the pH range 2.5-8.5, higher than free endoglucanase (FEG), which had 40% residual activity at the same pH range. The highest tolerated temperature for DEG was 70ºC, much higher than that of FEG, which was approximately 50ºC. Moreover, DEG showed 91.1% activity at 65ºC for 120 min, while FEG only kept 77.8% residual activity over the same period. The half-life of DEG was 270 min at 65ºC, compared with only 150 min for FEG. DEG could be used repeatedly at least three times. These results suggest that the DEG has broad applications as a yeast whole-cell biocatalyst, due to its novel properties of high catalytic efficiency, acid-thermal stabilities, and reusability.
Carbon dioxide reforming of methane with a free energy minimization approach
Jin Baosheng,Li Yanbing,Xiao Rui 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
dioxide reforming of methane to syngas is one of the primary technologies of the new poly-gen-eration energy system on the basis of gasification gas and coke oven gas. A free energy minimization is applied to studythe influence of operating parameters (temperature, pressure and methane-to-carbon dioxide ratio) on methane con-version, products distribution, and energy coupling between methane oxidation and carbon dioxide reforming methane.The results show that the methane conversion increases with temperature and decreases with pressure. When the meth-ane-to-carbon dioxide ratio increases, the methane conversion drops but the H2/CO ratio increases. By the introductionand the CO/H2 ratio can be adjusted as well without water-gas shift reaction for Fischer-Tropsch or methanol synthesis.
다중금속층 복합구조 핵연료 피복관 모관의 열간 등방압 가압법 공정 중 균열 발생원인 분석
바이바오성(Baosheng Bai),문준호(Joonho Moon),Michael P. Short,반치범(Chi Bum Bahn) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.12
본 연구에서 다중금속층 복합구조 핵연료 피복관 모관 제작을 위해 열간 등방압 가압법을 적용하였다. 이후 모관의 최외곽층을 구성하는 Fe12Cr2Si 합금 용접층 표면에서 균열이 발견되었다. 균열 발생의 원인을 분석하기 위하여 Fe12Cr2Si 합금 용접층에 대한 미세조직 관찰, 균열에 대한 파면 관찰, 인장시험 및 모관 제작 과정을 모사하는 유한요소해석이 수행되었다. 용접층 내 입계에서 Si 농축이나 결함은 발견되지 않았다. 일축 인장시험 결과 연성을 충분히 확보하고 있었으나, 발견된 균열 파면은 연성파괴 특성이 없이 편편한 파면을 보였다. 유한요소해석 결과, 열간 등방압 가압법 공정 중 고온에서 상온으로 냉각하는 과정에서 최외곽층인 Fe12Cr2Si 층에 다축응력이 인가되었다. 따라서 냉각 과정 중 재료층 간 열팽창 계수 차이로 인해 발생한 다축응력이 파괴 변형률을 낮추면서 최외곽층에서 shear fracture를 유발한 것으로 판단된다. Hot isostatic pressing (HIP) was applied to manufacture a multi-metallic layered composite mother tube for accident-tolerant nuclear fuel cladding. After the application, surface cracking was observed on the outermost layer, consisting of Fe12Cr2Si alloy weld. To analyze the root cause, microstructural analysis and uniaxial tension testing with Fe12Cr2Si alloy weld were conducted. Finite element analysis (FEA) was performed to simulate the HIP process, as well as fractography on the fracture surface. No Si segregation was found nor were any defects observed at grain boundaries. Although the sufficient ductility of the Fe12Cr2Si weld was confirmed by the uniaxial tensile testing, flat surfaces without ductile features were revealed by the fractography on the crack. The FEA revealed that a multiaxial stress state was applied on the Fe12Cr2Si layer during cooling. Therefore, it is most likely that the shear fracture on the surface of Fe12Cr2Si layer was caused by the stress triaxiality owing to the difference in thermal expansion coefficients.
Image Inpainting Based on Exemplar and Sparse Representation
Lei Zhang,Baosheng Kang,Benting Liu,Fei Zhang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9
We propose a novel image inpainting approach in which the exemplar and the sparse representation are combined together skillfully. In the process of image inpainting, often there will be such a situation: although the sum of squared differences (SSD) of exemplar patch is the smallest among all the candidate patches, there may be a noticeable visual discontinuity in the recovered image when using the exemplar patch to replace the target patch. In this case, we cleverly use the sparse representation of image over a redundant dictionary to recover the target patch, instead of using the exemplar patch to replace it, so that we can promptly prevent the occurrence and accumulation of errors, and obtain satisfied results. Experiments on a number of real and synthetic images demonstrate the effectiveness of proposed algorithm, and the recovered images can better meet the requirements of human vision.