http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jiawen Liu,정성재,Akbar Ali,엄석기 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
In this study, the microscopic transport properties of porous gas diffusion media (PGDMs) with capillary meniscus formation are evaluated using a statistical approach for electrochemical applications. The microscopic morphology of PGDM is stochastically modeled using randomly distributed carbon fibers and various meniscus formations. In particular, the meniscus formation of hydrophobic polytetrafl uorethylene (PTFE) agent enables the generation of highly elaborate microstructures in commercial PGDMs. A single-phase three-dimensional 19-velocity lattice Boltzmann method is applied to simulate the microscale mass transfer phenomena within the PGDMs. The mass transport characteristics (i.e., anisotropic permeability, tortuosity, and effective diffusion coefficient) of the PGDM samples with different PTFE content are statistically investigated as a function of untreated porosity (i.e., porosity before PTFE loading) of the PGDMs. The predicted results reveal an inverse relationship between anisotropic permeability and PTFE loading because the addition of PTFE decreases the bulk porosity of the PGDMs. In addition, the electrical and thermal conductivities of PGDMs are statistically estimated in both the in-plane and through-plane directions. The results show that the in-plane electrical and thermal conductivities are greater than those in the through-plane direction because of the carbon-fiber orientation. Moreover, the addition of PTFE has relatively larger effects on the through-plane electrical and thermal conductivities.
Jiawen Xu,Haodong Hong,Zhenyu Wang,Xinhu Sun,Yen Wei,Yu Liu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
Microfluidic devices are critical in lab-on-chip, drug delivery, flexible sensors, etc. However, a formidable challenge remains in fabricating microfluidic channels with complex shapes during design and verification. Herein, we present a facile approach for manufacturing polystyrene (PS) templates by in-suit combining microscale electrohydrodynamic (EHD) printing and mesoscale direct ink writing (DIW). The desired multiscale filament width from 20 μm to > 1 mm could be obtained through appropriate voltage and pressure with continuous printing. The further process parameters for adjusting line width including deposition speed, auxiliary heating for DIW/EHD printing mode were investigated detailly. And we prove the stability and feasibility for producing microfluidics via the method by AFM, EDS and filling test. Based on the solubility of PS in the organic solvent, we can readily reconfigure the existing template by erasing and printing part of the patterns for better remanufacturing. Finally, the LM-filling PDMS microfluidic is experimented to demonstrate the future potential and advantage of the printing technology for fabricating the flexible microfluidic device.
Lu Li,Jiawen Zhu,Kui Yang,Zhuofei Xu,Ziduo Liu,Rui Zhou 한국미생물학회 2014 The journal of microbiology Vol.52 No.6
Actinobacillus pleuropneumoniae is an important porcinerespiratory pathogen causing great economic losses in thepig industry worldwide. Oxygen deprivation is a stress thatA. pleuropneumoniae will encounter during both early infectionand the later, persistent stage. To understand modulationof A. pleuropneumoniae gene expression in responseto the stress caused by anaerobic conditions, gene expressionprofiles under anaerobic and aerobic conditions werecompared in this study. The microarray results showed that631 genes (27.7% of the total ORFs) were differentially expressedin anaerobic conditions. Many genes encoding proteinsinvolved in glycolysis, carbon source uptake systems,pyruvate metabolism, fermentation and the electron respirationtransport chain were up-regulated. These changes ledto an increased amount of pyruvate, lactate, ethanol and acetatein the bacterial cells as confirmed by metabolite detection. Genes encoding proteins involved in cell surface structures,especially biofilm formation, peptidoglycan biosynthesisand lipopolysaccharide biosynthesis were up-regulatedas well. Biofilm formation was significantly enhancedunder anaerobic conditions. These results indicate that inductionof central metabolism is important for basic survivalof A. pleuropneumoniae after a shift to an anaerobic environment. Enhanced biofilm formation may contribute tothe persistence of this pathogen in the damaged anaerobichost tissue and also in the early colonization stage. Thesediscoveries give new insights into adaptation mechanismsof A. pleuropneumoniae in response to environmental stress.
Wang Kailing,Liu Fan,Muchu Budumu,Deng Jiawen,Peng Jing,Xu Yan,Li Fujun,Ouyang Miao 대한약학회 2024 Archives of Pharmacal Research Vol.47 No.7
SMARCA5, a protein in the SWI/SNF family, has been previously implicated in the development of ulcerative colitis (UC) through methylation. However, the specifi c molecular mechanisms by which SMARCA5 contributes to colonic infl ammation and the imbalance between Th17 and Treg cells remain unclear. This study was designed to explore these molecular mechanisms. A UC mouse model was established using dextran sulfate sodium induction, followed by measurements of mouse weight, disease activity index (DAI) score, colon length, pathological changes in the colon, and FITC-dextran concentration. The levels of IL-17a, IFN-γ, IL-6, TNF-α, TGF-β, and IL-10 were measured, along with the protein expression of ZO-1 and Occludin. Flow cytometry was used to assess the presence of IL-17 + CD4 + (Th17 +) cells and FOXP3 + CD25 + CD4 + (Treg +) cells in the spleen and mesenteric lymph nodes of UC mice. We observed that SMARCA5 and RNF180 were increased, while ALKBH5 was downregulated in UC mouse colon tissue. SMARCA5 or RNF180 knockdown or ALKBH5 overexpression ameliorated the colon infl ammation and Th17/Treg cell imbalance in UC mice, shown by increased body weight, colon length, FOXP3 + CD25 + CD4 + T cells, and the levels of ZO-1, Occludin, TGF-β, IL-10, and FOXP3. It decreased DAI scores, IL-17 + CD4 + T cells, and levels of IL-17a, IFN-γ, IL-6, TNF-α, and ROR-γt. ALKBH5 inhibited SMARCA5 expression via m6A modifi cation, while RNF180 reduced ALKBH5 expression via ubiquitination. Our fi ndings indicate that RNF180 aggravated the colon infl ammation and Th17/Treg cell imbalance in UC mice by regulating the ALKBH5/SMARCA5 axis.
Shin, Seungho,Liu, Jiawen,Akbar, Ali,Um, Sukkee Elsevier 2019 Journal of catalysis Vol.377 No.-
<P><B>Abstract</B></P> <P>Nanoscale transport characteristics and catalyst utilization of vertically aligned carbon nanotube (VACNT) catalyst layers (CLs) are evaluated using a fully statistical modeling approach based on the inherent random nature of the catalyst layer structures for fuel cell applications. Composite morphological structures of the catalyst layers are stochastically modeled with a 95% confidence level, and transport phenomena inside the catalyst layers are simulated using the D3Q19 lattice Boltzmann method (LBM). The effective diffusion coefficient of VACNT catalyst layers is predicted to be higher than that of the conventional catalyst layer, despite a relatively small pore diameter and a low-Knudsen diffusion coefficient. Consequently, the VACNT catalyst layers exhibit improved catalyst utilization compared to the conventional catalyst layers. These statistical results obtained from a series of numerical experiments confirm that the PEFC catalyst layers containing the VACNT catalyst supports can provide more efficient reactant transport, resulting in enhanced catalyst utilization for electrochemical reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A 3-dimensional Lattice Boltzmann method (LBM) was proposed for catalyst modeling. </LI> <LI> Structure–transport characteristics of catalyst layer were statistically predicted. </LI> <LI> VACNT catalyst layers can form more favorable pore structures for mass transport. </LI> <LI> Nanotube forest effects of VACNT catalyst layers induces lower Knudsen diffusion. </LI> <LI> Improved pore design and low tortuosity yield higher catalyst utilization in VACNT. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ruoqu Wei,Haifei Liu,Zhen Zhang,Fuying Chen,Jiawen Chen,Qianyue Xu,Hong Yu,Jianying Liang,Zhirong Yao 대한피부과학회 2023 Annals of Dermatology Vol.35 No.-
Subcutaneous panniculitis-like T-cell lymphoma (SPTL) is an extremely rare, indolent skin malignancy that can be difficult to distinguish from autoimmune disease-associated panniculitides. Here, we describe a 12-year-old boy who was diagnosed at age 7 years with dermatomyositis with classical manifestations, including poikiloderma, Gottron’s sign, and symmetric muscle weakness. Recently, the boy presented multiple subcutaneous nodules and fever. Histopathological examination and immunohistochemical staining revealed co- existence of SPTL. To our knowledge, this is the first case of dermatomyositis accompanied with SPTL. This case alert clinical physicians of the possibility of SPTL should be considered when a patient with dermatomyositis has new lesions presenting as nodules and unknown fever.