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Numerical modeling and simulation of PEM fuel cells: Progress and perspective

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Acta Mechanica Sinica 2013年第3期29卷 318-334页

作者： Guang-hua song hua Meng School of Aeronautics and Astronautics Zhejiang University

This paper provides a comprehensive review on the research and development in multi-scale numerical modeling and simulation of PEM fuel cells. An overview of recent progress in PEM fuel cell modeling has been provided. Fundamental transport phenomena in PEM fuel cells and the corresponding mathematical formulation of macroscale models are analyzed. Various important issues in PEM fuel cell modeling and simulation are examined in detail, including fluid flow and species transport, electron and proton transport, heat transfer and thermal management, liquid water transport and water management, transient response behaviors, and cold-start processes. Key areas for further improvements have also been discussed.

关键词： PEM fuel cell · Numerical modeling · Multiscale simulation · Two-phase transport · Water management · Thermal management

Preparation of Ni2P/Al-SBA-15 catalyst and its performance for benzofuran hydrodeoxygenation

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Chinese Journal of Chemical Engineering 2017年第12期25卷 1784-1790页

作者： Tianhan Zhu hua song Xueya Dai hualin song Provincial Key Laboratory of Oil & Gas Chemical Technology College of Chemistry & Chemical Engineering Northeast Petroleum University Daqing 163318 China Key Laboratory of Cancer Prevention and Treatment of Heilongjiang Province Mudanjiang Medical University Mudanjiang 157011 China

The Al-doped Ni2P/AI-SBA-15 catalyst with high hydrodeoxygenation （HDO） activity was synthesized by tem- perature programmed reduction at a relatively low reduction temperature of 400 ℃. The as-prepared catalyst was characterized by X-ray diffraction （XRD）, H2 temperature-programmed reduction （H2-TPR）, X-ray photoelectron spectroscopy （XPS）, transmission electron microscope （TEM）, NH3 temperature programmed desorption （NH3-TPD）, N2 adsorption-desorption and CO uptake. The effect of AI on benzofuran （BF） HDO performance was investigated. The result indicates that the incorporation of AI into the SBA-15 support can promote the formation of much uniform, smaller, highly dispersed N2P particles on the catalyst. The AI also contrib- utes to suppress the enrichment of P and promote more exposed Ni sites on the surface. In addition, the incorporation of AI can enhance the acid strength. The total deoxygenated product yield over Ni2P/AI-SBA-15 reached 90.3%, which is an increase of 19.4%, when compared with that found for Ni2P/SBA-15 （70.9%）.

关键词： Ni2P SBA-15 Hydrodeoxygenation Benzofuran AI

A multiscale Galerkin method for the hypersingular integral equation reduced by the harmonic equation

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Applied Mathematics(A Journal of Chinese Universities) 2013年第1期28卷 75-89页

作者： LI song-hua XIAN Jun Department of Mathematics Hunan institute of science and technology Department of Mathematics and Guangdong Province Key Laboratory of Computational Science Sun Yat-sen University

The aim of this paper is to investigate the numerical solution of the hypersingular integral equation reduced by the harmonic equation. First, we transform the hypersingular integral equation into 2π-periodic hypersingular integral equation with the map x=cot（θ/2）. Second, we initiate the study of the multiscale Galerkin method for the 2π-periodic hypersingular integral equation. The trigonometric wavelets are used as trial functions. Consequently, the 2j＋1 × 2j＋1 stiffness matrix Kj can be partitioned j×j block matrices. Furthermore, these block matrices are zeros except main diagonal block matrices. These main diagonal block matrices are symmetrical and circulant matrices, and hence the solution of the associated linear algebraic system can be solved with the fast Fourier transform and the inverse fast Fourier transform instead of the inverse matrix. Finally, we provide several numerical examples to demonstrate our method has good accuracy even though the exact solutions are multi-peak and almost singular.

关键词： Trigonometric wavelet multiscale Galerkin method matrix decomposition FFT hypersingular integral equation harmonic equation.

Rare earth metals modified Ni-S2O8^2-/ZrO2-Al2O3 catalysts for n-pentane isomerization

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Chinese Journal of Chemical Engineering 2017年第1期25卷 74-78页

作者： hua song Lele Zhao Na Wang College of Chemistry ＆ Chemical Engineering Northeast Petroleum University Daqing 163318 China Provincial Key Laboratory of Oil ＆ Gas Chemical Technology College of Chemistry ＆ Chemical Engineering Northeast Petroleum University Daqing 163318 China

The effects of adding rare earth(RE) metals,such as Ce,Yb and Pr to Ni-S_2O_8^(2-)/ZrO_2-Al_2O_3(Ni-SZA) on the structure of catalysts as well as their isomerization performance were *** prepared catalysts were characterized by XRD,BET,FT-IR,Py-IR,and H_2-TPR,The results showed that the addition of RE metals can increase the strength and amounts of the acid sites,improve the redox properties of *** Yb-Ni-SZA catalyst showed the best redox properties,which could provide enough metallic *** addition,it provided the largest amounts of weak and moderately strong acid *** RE metals modified Ni-SZA catalyst,Yb-Ni-SZA exhibited the highest isopentane yield of 61.7%at 160 °*** optimum isomerization catalytic performance of the catalysts decreased in the order of Yb-Ni-SZA > Pr-Ni-SZA > Ni-SZA > Ce-Ni-SZA.

关键词： Rare earths Solid superadd Catalyst Hydroisomerization

A distributed non-point source pollution model: calibration and validation in the Yellow River Basin

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Journal of Environmental Sciences 2004年第4期16卷 646-650页

作者： HAOFang-hua ZHANGXue-song YANGZhi-feng InstituteofEnvironmentalSciences BeijingNormalUniversityBeijing100875China

The applicability of a non-point source pollution model—SWAT(soil and water assessment tools) in a large river basin with high sediment runoff modulus(770 t/km2 in the Yellow River) was examined. The basic database, which includes DEM, soil and landuse map, weather data, and land management data, was established for the study area using GIS. A two-stage “Brute Force' optimization method was used to calibrate the parameters with the observed monthly flow and sediment data from 1992 to 1997. In the process of calibration automated digital filter technique was used to separate direct runoff and base flow. The direct runoff was firstly calibrated, and the base flow, then the total runoff was matched. The sediment yield was calibrated to match well. Keeping input parameters set during the calibration process unchanged, the model was validated with 1998—1999's observed monthly flow and sediment. The evaluation coefficients for simulated and observed flow and sediment showed that SWAT was successfully applied in the study area: relative error was within 20%, coefficient of determination and Nash-Suttcliffe simulation efficiency were all equal to or above 0.70 during calibration and validation period.

关键词： Yellow River SWAT sediment flow non-point source pollution

Regulation of JAK/STAT signal pathway by miR-21 in the pathogenesis of juvenile idiopathic arthritis

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World Journal of Pediatrics 2020年第5期16卷 502-513页

作者： Hong-Wei Li hua-song Zeng Department of Pediatric Allergy Immunology and Rheumatology Guangzhou Women and Children Medical CenterGuangzhou 510623China Department of Pediatric Allergy Immunology and RheumatologyGuangzhou Women and Children's Medical CenterGuangzhou Medical University9 Jinsui RoadGuangzhou 510175China

Background Overexpression of the components of the Janus kinase/signal transducer and activator of transcription(JAK/STAT)signalling pathway is the key factor of the pathogenic mechanisms underlying systemic juvenile idiopathic arthritis(sJIA).The study aims to investigate the association between miR-21 and the JAK/STAT signal pathway in *** Total RNA was extracted from peripheral blood mononuclear cells(PBMCs)in active JIA *** relative expressions of miR-21,STAT3 and suppressor of cytokine signalling 3 in PBMCs were measured by real-time polymerase chain reaction and their expressions were measured by western blotting and dual-luciferase reported *** arthritis fibroblast-like synovial cell(RASF)was stimulated to become to osteoclasts using macrophage colony-stimulating factor(M-CSF)and factors that can impact on their differentiation ability were identified through the transfection of *** expression of STAT3/p-STAT3 was measured by western blot,and the levels of interleukin(IL)-17A,p65,matrix metalloproteinases(MMP)-3,MMP-4 and receptor activator of nuclear factor-κd3 after the LV3-miR-21 transfection were tested by enzyme-linked immunosorbent ***,the miR-21 targeted STAT3 gene was detected by the dualluciferase reported *** The expression of miR-21 was significantly lower in JIA patients than in healthy control(P<0.05).The level of STAT3 was increased in PBMCs of JIA group compared with control group(P<0.05).Furthermore,the expression levels of miR-21 in sJIA and polyarticular JIA groups were negatively correlated with STAT3(r=-0.5854/r=-0.6134,P<0.05).The expression of STAT3 changed little in PBMCS after the stimulation of IL-6 and not in RASFs with transfection of *** expression of p-STAT3 decreased after the stimulation of IL-6 in RASFs transfected by LV3-miR-21(P<0.05).RASFs were induced into osteoclasts using *** number of osteoclasts as determined by tartrate-resistant acid phospha

关键词： JAK/STAT Juvenile idiopathic arthritis MiR-21 Signal transducer and activator of transcription 3 (STAT3)/p-STAT3

Plasma membrane lipid scrambling causing phosphatidylserine exposure negatively regulates NK cell activation

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Cellular & Molecular Immunology 2021年第3期18卷 686-697页

作者： Ning Wu hua song Andre Veillette Laboratory of Molecular Oncology Institut de recherches cliniques de Montreal(IRCM)MontrealQC H2W1R7Canada Department of Immunology School of Basic MedicineTongji Medical CollegeHuazhong University of Science and Technology(HUST)WuhanChina Department of Medicine University of MontrealMontrealQC H3C3J7Canada Department of Medicine McGill UniversityMontrealQC H3G 1Y6f Canada

One of the hallmarks of live cells is the asymmetric distribution of lipids across their plasma *** in this asymmetry due to lipid"scrambling"result in phosphatidylserine exposure at the cell surface that is detected by annexin V *** alteration is observed during cell death processes such as apoptosis,and during physiological responses such as platelet degranulation and membrane *** studies have shown that activation of NK cells is accompanied by exposure of phosphatidylserine at the cell *** this response was thought to be indicative of ongoing NK cell death,it may also reflect the regulation of NK cell activation in the absence of cell ***,we found that NK cell activation was accompanied by rapid phosphatidylserine exposure to an extent proportional to the degree of NK cell *** enforced expression of a lipid scramblase,we provided evidence that activation-induced lipid scrambling in NK cells is reversible and does not lead to cell *** contrast,lipid scrambling attenuates NKcell *** response was accompanied by reduced cell surface expression of activating receptors such as 2B4,and by loss of binding of Src family protein tyrosine kinases Fyn and Lck to the inner leaflet of the plasma ***,lipid scrambling during NK cell activation is,at least in part,a physiological response that reduces the NK cell activation *** effect is due to the ability of lipid scrambling to alter the distribution of membrane-associated receptors and kinases required for NK cell activation.

关键词： NK cell activation Phosphatidylserine exposure Lipid scrambling TMEM16F Signaling

Hypereosinophilia with cerebral venous sinus thrombosis and intracerebral hemorrhage:A case report and review of the literature

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World Journal of Clinical Cases 2021年第28期9卷 8571-8578页

作者： Xiu-hua song Tian Xu Guo-hua Zhao Department of Neurology The Fourth Affiliated HospitalZhejiang University School of MedicineYiwu 322000Zhejiang ProvinceChina

BACKGROUND Hypereosinophilia(HE)is defined as a peripheral blood eosinophil count of>1.5×109/L and may be associated with tissue *** clinical presentations of HE vary;however,myocardial fibrosis and thrombosis can threaten the lives of patients with sustained *** venous sinus thrombosis(CVST)in the setting of eosinophil-related diseases has seldom been ***,we review the literature on HE with CVST to increase knowledge and encourage early *** SUMMARY A previously healthy 41-year-old man was admitted to hospital with diarrhea and abdominal *** was treated with antibiotics for suspected acute *** days later,he experienced headache and *** computed tomography(CT)revealed thrombosis of the left jugular vein to the left transverse sinus ***(PLT)count decreased to 60×1012/L,and absolute eosinophil count(AEC)increased to 2.41×109/*** was treated with low-molecular-weight *** count progressively decreased to 14×109/L,and we terminated anticoagulation and performed PLT *** days after admission,he complained of a worsening *** CT revealed right temporal lobe and left centrum semiovale intracerebral hemorrhage,and AEC increased to 7.65×109/*** used prednisolone for *** level of consciousness decreased,so emergency hematoma removal and decompressive craniectomy for right cerebral hemorrhage were *** patient was alert 2 d after *** was treated with anticoagulation again 2 wk after *** were gradually tapered without any symptomatic recurrence or abnormal laboratory *** HE can induce CVST,and we need to focus on eosinophil counts in patients with CVST.

关键词： Cerebral venous sinus thrombosis Intracerebral hemorrhage Hypereosinophilia Hypereosinophilic syndrome Thrombocytopenia Colitis Case report

Multi Dromion-Solitoff and Fractal Excitations for (2+1)-Dimensional Boiti-Leon-Manna-Pempinelli System

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Communications in Theoretical Physics 2009年第10期52卷 641-645页

作者： MA song-hua FANG Jian-Ping College of Mathematics and Physics Lishui University Lishui 323000 China

In this short note, a new projective equation （Ф = σФ ＋ Ф^2） is used to obtain the variable separation solutions with two arbitrary functions of the （2＋1）-dimensional Boiti-Leon-Manna Pempinelli system （BLMP）. Based on the derived solitary wave solution and by selecting appropriate functions, some novel localized excitations such as multi dromion-solitoffs and fractal-solitons are investigated.

关键词： new projective equation BLMP system multi dromion-solitoffs fractal-solitons