A finite difference scheme for RLW-Burgers equation

Xiaohong Zhao,Desheng Li,Deming Shi 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.3-4

In this paper, a finite difference method for a Cauchy problem of RLW-Burgers equation was considered. Although the equation is not energy conservation, we have given its the energy conservative finite difference scheme with condition. Convergence and stability of the difference solution were proved. Numerical results demonstrate that the method is efficient and reliable. In this paper, a finite difference method for a Cauchy problem of RLW-Burgers equation was considered. Although the equation is not energy conservation, we have given its the energy conservative finite difference scheme with condition. Convergence and stability of the difference solution were proved. Numerical results demonstrate that the method is efficient and reliable.

Inhibition of ClC-5 suppresses proliferation and induces apoptosis in cholangiocarcinoma cells through the Wnt/β-catenin signaling pathway

( Zhe Shi ),( Liyuan Zhou ),( Yan Zhou ),( Xiaoyan Jia ),( Xiangjun Yu ),( Xiaohong An ),( Yanzhen Han ) 생화학분자생물학회 2022 BMB Reports Vol.55 No.6

Chloride channel-5 (ClC-5), an important branch of the ClC family, is involved in the regulation of the proliferation and cell-fate of a variety of cells, including tumor cells. However, its function in cholangiocarcinoma (CCA) cells remains enigmatic. Here, we discovered that ClC-5 was up-regulated in CCA tissues and CCA cell lines, while ClC-5 silencing inhibited CCA cell proliferation and induced apoptosis. Further mechanism studies revealed that ClC-5 inhibition could inhibit Wnt/β-catenin signaling activity and further activate the mitochondria apoptotic pathway in CCA cells. Furthermore, rescuing Wnt/β-catenin signaling activation eliminated the anti-tumor function of ClC-5 knockdown. Together, our research findings illustrated that ClC-5 inhibition plays an anti-tumor role in CCA cells via inhibiting the activity of the Wnt/β-catenin pathway, which in turn activates the mitochondrial apoptotic pathway. [BMB Reports 2022; 55(6): 299-304]

Construction of rough and porous surface of hydrophobic PTFE powderembedded PVDF hollow fiber composite membrane for accelerated water mass transfer of membrane distillation

Wenying Shi,Tengfei Li,Mengjie Fan,Hongbin Li,Haixia Zhang,Xiaohong Qin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-

The construction of rough and porous hydrophobic membrane surface is expected to overcome the obstaclesincluding low permeate water flux and membrane pore wetting which greatly restrict the developmentof membrane distillation (MD) technology. In this study, a rough and porouspolytetrafluoroethylene (PTFE) powder-embedded polyvinylidene fluoride (PVDF) hydrophobic coatinglayer was compounded on the outer surface of PVDF hollow fiber support membrane by the dilute solutioncoating-phase inversion method. PVDF hollow fiber support membrane was fabricated by the dry-jetwet-spinning technique. PTFE powder was directly incorporated in PVDF dilute coating solution andembedded in the porous PVDF coating layer after the nonsolvent induced phase separation (NIPS). Thevariations of membrane morphology, surface chemical compositions, hydrophobicity and wetting resistancewere investigated by scanning electron microscope (SEM), Attenuated total reflection-Fouriertransform infrared spectroscopy (ATR-FTIR), dynamic water contact angle (WCA) and liquid entry pressure(LEP) analysis. Membrane separation performance including desalination and ionic dyes removalproperties was evaluated by VMD experiment. Compared with PVDF hollow fiber support membrane,both the surface hydrophobicity and the water permeability of the PTFE powder-embedded PVDF hollowfiber composite membrane (HFC) had obvious improvement. The surface WCA and permeate water fluxincreased from 92.6 and 11.3 kg/m2.h for PVDF support membrane to 133.6 and 26.8 kg/m2.h for thePTFE powder-embedded HFC membrane meanwhile NaCl rejection can be maintained above 99.9%(3.5 wt% NaCl aqueous solution at 50 C and permeate pressure at 31.3 kPa). The separation performanceof HFC membrane can remain stable without obvious pore wetting during the continuous MD operationfor 36 h. Different from the desalination, porous hollow fiber membrane would adsorb two differentcharged dyes, Congo red (CR) and methylene blue (MB) to a certain extent, resulting in the decrease ofmembrane flux and the change of permeate water quality. Finally, the MD separation mechanism of inorganicsalt, anionic dye and cationic dye by PTFE powder-embedded HFC membrane was proposed.

Continuous biodiesel production from acidic oil using a combination of the acid-, alkali-catalyzed membrane and GO/PVDF separation membrane

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).

Preparation of cMWCNTs-incorporated Hollow Fiber Membrane with Improved Water Flux and Dye Adsorption Properties

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.

A FINITE DIFFERENCE SCHEME FOR RLW-BURGERS EQUATION

Zhao, Xiaohong,Li, Desheng,Shi, Deming Korean Society of Computational and Applied Mathem 2008 Journal of applied mathematics & informatics Vol.26 No.3-4

In this paper, a finite difference method for a Cauchy problem of RLW-Burgers equation was considered. Although the equation is not energy conservation, we have given its the energy conservative finite difference scheme with condition. Convergence and stability of the difference solution were proved. Numerical results demonstrate that the method is efficient and reliable.

Retraction: Inhibition of ClC-5 suppresses proliferation and induces apoptosis in cholangiocarcinoma cells through the Wnt/β-catenin signaling pathway

Zhe Shi,Liyuan Zhou,Yan Zhou,Xiaoyan Jia,Xiangjun Yu,Xiaohong An,Yanzhen Han Korean Society for Biochemistry and Molecular Biol 2024 BMB Reports Vol.57 No.2

Preparation and deposition mechanism of pyrolytic carbon by CVI using 3D Ni/wood-carbon catalyst

Lulu Han,Xiaohong Shi,Xu Han,Li Yang,Kun Li,Tian Xinfa,Mu Jierui,Wang Guoqing 한국탄소학회 2022 Carbon Letters Vol.32 No.1

To improve the pyrolytic carbon (PyC) deposition rate of Carbon/Carbon (C/C) composites prepared by the traditional chemical vapor infiltration (CVI) method, the 3D Ni/wood-carbon (3D Ni/C) catalyst was introduced into the CVI process. The effects of catalyst on the density of C/C composites were studied, and the deposition rate and morphologies of PyC were investigated after catalytic CVI. The morphologies of catalyst and PyC were characterized by scanning electron microscope and polarized light microscopy. The catalytic deposition mechanism of PyC was studied by density functional theory. The experimental results show that the initial carbon deposition efficiency of the catalytic pyrolysis process was 3–4 times that of the noncatalytic process. The catalyst reduced the energy barrier in the first step of deposition reaction from 382.55 to 171.67 kJ/mol according to simulation results. The pyrolysis reaction energy with Ni catalyst is reduced by 54% than that without the catalyst.

Effect of Laser Power on Tensile Performance of TA15 Laser-Welded Lock Bottom Joint

Na Qi,Xiaohong Zhan,Shuai Chen,Dan Chen,Shi He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

Taking TA15 titanium alloy as the research object, laser welding experiments of are performed on the lock-bottom joints,and the microstructure and tensile performance of the joints are analyzed. The laser welding speed is constant and the laserpower is 1000 w, 1300 kw, 1600 kw respectively. The bottom weld width and the width of high temperature heat-affectedzone (HT-HAZ) increase significantly as laser power increase. The microstructure of the heat-affected zone (HAZ) is relativelycomplicated, mainly composed of secondary α, acicular α structure and β. The microstructure at the weld metal iscomprised of the martensite α′ and acicular α. The tensile strength, fracture morphology and chemical composition of thewelded joint are studied by tensile test, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS)analysis techniques. The results show that all the specimens fractured near the heat-affected zone, and the fracture is a ductilefracture in the shape of a dimple. The tensile strength of welded joint decreases with the increase of laser power. Whenthe laser power is 1.0 kw, 1.3 kw and 1.6 kw, the tensile strength is 723 MPa, 705 MPa and 695 MPa respectively, which is64.55%, 62.95% and 62.05% of the base material strength. EDS results show that Mo and V elements are the strengtheningelements, while the burning loss of Mo and V reduce the strength of the joint.

Corrosion trend on Q450 weathering steel deposited with Na2SO4, NaCl under ultraviolet light illumination

Liying Song,Hao Shi,Peng Han,Xiaohong Ji,Fubin Ma 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-

A contrastive study about ultraviolet light (UV) illumination on Na2SO4, NaCl induced Q450 weatheringsteel was qualitatively and quantitatively studied. The corrosion rate was calculated from mass losses andthe order was as following, coupons deposited with Na2SO4 under UV illumination(238.18 lA cm 2) > with NaCl under UV illumination (213.77 lA cm 2) > with NaCl under Dark condition(71.98 lA cm 2) > with Na2SO4 under Dark condition (43.26 lA cm 2). The influence of UV illuminationon metal corrosion followed this sequence: Na2SO4 > NaCl, and which was on account of corrosion productsfilm on metal depositing Na2SO4 with a larger carrier density on metal depositing Na2SO4 with a largercarrier density (9.32 1020 cm 3) and stronger electric conductivity ability than NaCl (8.93 1020cm 3). Electrochemical impedance spectroscopy studies revealed charge transfer resistance Rct value,suggesting that smaller resistances gained on the rusted samples due to UV illumination, and an acceleratedcorrosion effect on rusted sample was also obtained under UV illumination. The improved corrosionperformance by UV illumination was due to corrosion products of semiconductor property andphotovoltaic effect.