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Characterization of size effect of natural convection in melting process of phase change material in square cavity

Chinese Physics B 2021年第10期30卷 400-409页

作者： Shi-hao cao Hui Wang College of Civil Engineering Henan University of TechnologyZhengzhou 450001China School of Civil Engineering and Architecture Hainan UniversityHaikou 570228China

The accelerating effect of natural convection on the melting of phase change material(PCM)has been extensively ***,such an influence is directly dependent on the size and shape of domain in which phase change happens,and how to quantitatively describe such an influence is still *** the other hand,the simulation of natural convection process is considerably difficult,involving complex fluid flow in a region changing with time,and is typically not operable in *** overcome these obstacles,the present study aims to quantitatively investigate the size effect of natural convection in the melting process of PCM paraffin filled in a square latent heat storage system through experiment and simulation,and ultimately a correlation equation to represent its contribution is ***,the paraffin melting experiment is conducted to validate the two-dimensional finite element model based on the enthalpy ***,a comprehensive investigation is performed numerically for various domain *** results show that the melting behavior of paraffin is dominated by the thermal *** the melting time exceeds 50 s,a whirlpoor flow caused by natural convection appears in the upper liquid phase region close to the heating wall,and then its influencing range gradually increases to accelerate the melting of ***,its intensity gradually decreases as the distance between the melting front and the heating wall ***,it is found that the correlation between the total melting time and the domain size approximately exhibits a power *** the domain size is less than 2 mm,the accelerating effect of natural convection becomes very weak and can be ignored in ***,in order to simplify the complex calculation of natural convection,the equivalent thermal conductivity concept is proposed to include the contribution of natural convection to the total melting time,and an empirical correlation is given fo

关键词： phase change material natural convection size effect equivalent thermal conductivity

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Symmetric and Anti-Symmetric Solitons of the Fractional Second- and Third-Order Nonlinear Schrodinger Equation

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Chinese Physics Letters 2021年第9期38卷 18-21页

作者： Qi-hao cao Chao-Qing Dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China

The fractional second-and third-order nonlinear Schrodinger equation is studied,symmetric and antisymmetric soliton solutions are derived,and the influence of the Levy index on different solitons is *** stability and stability interval of solitons are *** anti-interference ability of stable solitons to the small disturbance shows a good robustness.

关键词： solitons stability soliton

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TOTAL GENERALIZED MINIMUM BACKWARD ERROR ALGORITHM FOR SOLVING NONSYMMETRIC LINEAR SYSTEMS

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Journal of Computational Mathematics 1998年第6期16卷 539-550页

作者： Zhi-hao cao (Dearptment of Mathematics, Fudan University, Shanghai 200433, China) 复旦大学数学系上海

This paper extendes the results by E.M. Kasenally([7]) on a Generalized Minimum Backward Error Algorithm for nonsymmetric linear systems Ax = b to the problem in which pertubations are simultaneously permitted on A and b. The approach adopted by Kasenally has been to view the approximate solution as the exact solution to a perturbed linear system in which changes are permitted to the matrix A only. The new method introduced in this paper is a Krylov subspace iterative method which minimizes the norm of the perturbations to both the observation vector b and the data matrix A and has better performance than the Kasenally's method and the restarted GMRES method([12]). The minimization problem amounts to computing the smallest singular value and the corresponding right singular vector of a low-order upper-Hessenberg matrix. Theoratical properties of the algorithm are discussed and practical implementation issues are considered. The numerical examples are also given.

关键词： nonsymmetric linear systems iterative methods backward error

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Tissue resident regulatory T cells： novel therapeutic targets for human disease

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Cellular & Molecular Immunology 2015年第5期12卷 543-552页

作者： Xiaohui Zhou Jiayou Tang hao cao Huimin Fan Bin Li Research Center for Translational Medicine Shanghai East Hospital Tongji University School of Medicine Shanghai Heart Failure Research Center Department of Heart Failure Shanghai East Hospital Tongji University School of Medicine Key Laboratory of Molecular Virology & Immunology Unit of Molecular Immunology Institute Pasteur of Shanghai Shanghai Institutes for Biological Sciences Shanghai 200120 China

Over the past decade, the ability of regulatory T cells （Tregs） to suppress multiple types of immune cells has received tremendous attention. Mounting evidence has revealed that tissue resident Tregs control non-immunological processes of their target tissues and contribute to a plethora of human diseases. The identification of novel tissue-specific Tregs has highlighted their heterogeneity and complexity. This review summarizes the recent findings for visceral adipose tissue CD4＋Foxp3＋ regulatory T cells （VAT Tregs）, muscle Tregs, bone Tregs and skin memory Tregs, with a focus on their unique functions in local tissues. This interpretation of the roles of tissue-specific Tregs and of their involvement in disease progression provides new insight into the discovery of potential therapeutic targets of human diseases.

关键词： Regulatory T cells Tissue Tregs VAT Tregs Muscle Repair Areg Tumor Bone Skin memory Tregs

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Therapeutic silencing miR-146b-5p improves cardiac remodeling in a porcine model of myocardial infarction by modulating the wound reparative phenotype

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Protein & Cell 2021年第3期12卷 194-212页

作者： Yiteng Liao hao Li hao cao Yun Dong Lei Gao Zhongmin Liu Junbo Ge Hongming Zhu Research Center for Translational Medicine Shanghai East HospitalTongji University School of MedicineShanghai 200120China Department of Cardiology Shanghai Tenth People's HospitalTongji University School of MedicineShanghai 200072China Department of Cardiovascular Surgery Shanghai East HospitalTongji University School of MedicineShanghai 200120China Department of Ultrasound in Medicine Shanghai East HospitalTongji University School of MedicineShanghai 200120China Department of Cardiology Shanghai Institute of Cardiovascular DiseasesZhongshan Hospital of Fudan UniversityShanghai 200032China

Fibrotic remodeling is an adverse consequence of immune response-driven phenotypic modulation of cardiac cells following myocardial infarction(Ml).MicroRNA-146b(miR-146b)is an active regulator of immunomodulation,but its function in the cardiac inflammatory cascade and its clinical implication in fibrotic remodeling following Ml remain largely ***,miR-146b-5p was found to be upregulated in the infarcted myocardium of mice and the serum of myocardial ischemia ***-and loss-of-function experiments demonstrated that miR-146b-5p was a hypoxia-induced regulator that governed the pro-fibrotic phenotype transition of cardiac *** of miR-146b-5p activated fibroblast proliferation,migration,and fibroblast-to-myofibroblast transition,impaired endothelial cell function and stress survival,and disturbed macrophage paracrine ***,the opposite effects were observed when miR-146b-5p expression was *** assays and rescue studies demonstrated that the miR-146b-5p target genes mediating the above phenotypic modulations included interleukin 1 receptor associated kinase 1(IRAKI)and carcinoembryonic antigen related cell adhesion molecule 1(CEACAM1).Local delivery of a miR-146b-5p antagomir significantly reduced fibrosis and cell death,and upregulated capillary and reparative macrophages in the infarcted myocardium to restore cardiac remodeling and function in both mouse and porcine Ml *** inhibition of miR-146b-5p may represent a novel therapeutic approach to treat cardiac fibrotic remodeling and dysfunction following Ml.

关键词： cardiac fibrosis microRNA porcine model myocardial infarction

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Thermally enhanced shale gas recovery: microstructure characteristics of combusted shale

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Petroleum Science 2020年第4期17卷 1056-1066页

作者： Yuan-hao cao Wei Chen Teng-Xi Wang Yin-Nan Yuan School of Energy Soochow UniversitySuzhou 215006JiangsuChina Department of Mechanical Engineering Texas A&M UniversityCollege Station 77840USA

Recently,thermal recovery technologies such as combustion have been studied for shale gas ***,understanding of the microstructure of combusted shale is essential for evaluating the effects of thermal treatment on shale gas transport *** this study,the effect of combustion on shale microstructure changes was ***,different-sized shale samples were combusted at 450℃ for 30 ***,shale microstructure properties including surface topographies,porosity and permeability of the raw and combusted shale samples were measured and *** was found that the pore volume and specific surface area increased after combustion,especially for small pulverized *** to surface topography obtained from atomic force microscope,more rough surfaces were obtained for the combusted shale due to larger pores and generation of thermal fractures caused by the removal of organic *** on the mercury intrusion porosimetry measurements,the porosity of the shale samples increased from 2.79% to 5.32% after *** addition,the permeability was greatly improved from 0.0019 to 0.6759 mD,with the effective tortuosity decreased from 1075.40 *** a result,combustion treatment can significantly improve the gas transport capacity.

关键词： Shale Combustion Microstructure Porosity Permeability Particle size

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Simultaneous Determination of Trace Matrine and Oxymatrine Pesticide Residues in Tea by Magnetic Solid-Phase Extraction Coupled with Liquid Chromatography-Tandem Mass Spectrometry

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Journal of Analysis and Testing 2024年第2期8卷 245-250页

作者： Hongmei Liu Yang Li Yangjiayi Xiang hao cao Yan Li Pharmaceutical Analysis Department School of PharmacyFudan UniversityShanghai201203China Center for Medical Research and Innovation Shanghai Pudong HospitalFudan University Pudong Medical CenterShanghai201399China MOE Innovative Center for New Drug Development of Immune Inflammatory Diseases Fudan UniversityShanghai201203China

We developed a magnetic solid-phase extraction method using Fe_(3)O_(4)@polydopamine(Fe_(3)O_(4)@PDA)as adsorbents,coupled with liquid chromatography-tandem mass spectrometry(LC-MS/MS),for the enrichment and quantification of trace matrine and oxymatrine pesticide residues in *** adsorbent was easily synthesized at room temperature with high yields(500 mg).We investigated and optimized several factors that influence the efficiency of the method,including matrix pH,adsorbent amount,adsorption time,type of elution solvent.

关键词： adsorbent Chromatography adsorption

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Biocompatibility of light responsive materials prepared for accommodative intraocular lenses manufacturing

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International Journal of Ophthalmology(English edition) 2024年第12期17卷 2167-2176页

作者： Chen-Zi Liu Ming-hao Sun Wei Dai Lan-cao hao Si-Quan Zhu Department of Ophthalmology Beijing Anzhen HospitalCapital Medical UniversityBeijing 100029China Department of Ophthalmology Xiamen Ophthalmology CenterXiamen UniversityXiamen 361004Fujian ProvinceChina

AIM:To investigate the biocompatibility and bacterial adhesion properties of light responsive materials(LRM)and analyze the feasibility and biosafety of employing LRM in the preparation of accommodative intraocular lenses(AIOLs).METHODS:Employing fundamental experimental research techniques,LRM with human lens epithelial cells(hLECs)and human retinal pigment epithelium cells(ARPE-19 cells)were *** available intraocular lenses(IOLs)were used as controls to perform cell counting kit-8(CCK-8),cell staining under varying light intensities,cell adhesion and bacterial adhesion ***:LRM exhibited a stronger inhibitory effect on the proliferation of ARPE19 cells than commercially available IOLs when co-cultured with the undiluted extract for 96h(P<0.05).Under other culturing conditions,the effects on the proliferation of hLECs and ARPE-19 cells were not significantly different between the two *** the influence of light irradiation at intensities of 200 and 300 mW/cm^(2),LRM demonstrated a markedly higher inhibitory effect on the survival of hLECs compared to commercially available IOLs(P<0.0001).They also showed a stronger suppressive effect on the survival rate of ARPE-19 cells,with significant differences observed at 200 mW/cm^(2)(P<0.001)and extremely significant differences at 300 mW/cm^(2)(P<0.0001).Additionally,compared to commercially available IOLs,LRM had a higher number of cells adhering to their surface(P<0.05),as well as a significantly greater number of adherent bacterium(P<0.0001).CONCLUSION:LRM,characterized by their excellent non-contact tunable deformability and low cytotoxicity to ocular tissues,show considerable potential for use in the fabrication of *** materials demonstrate strong cell adhesion;however,during photothermal conversion processes involving shape deformation under various light intensities,the resultant temperature rise may harm surrounding *** factors suggest that while the ma

关键词： light responsive materials accommodative intraocular lens biocompatibility bacterial adhesion

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Symmetric and antisymmetric vector solitons for the fractional quadric-cubic coupled nonlinear Schrodinger equation

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Communications in Theoretical Physics 2022年第7期74卷 1-8页

作者： Jia-Zhen Xu Qi-hao cao Chao-Qing Dai Zhejiang A&F University Zhejiang 311300China

The fractional quadric-cubic coupled nonlinear Schrodinger equation is concerned,and vector symmetric and antisymmetric soliton solutions are obtained by the square operator *** relationship between the Lévy index and the amplitudes of vector symmetric and antisymmetric solitons is *** components of vector symmetric and antisymmetric solitons show a positive and negative trend with the Lévy index,*** stability intervals of these solitons and the propagation constants corresponding to the maximum and minimum instability growth rates are *** indicate that vector symmetric solitons are more stable and have better interference resistance than vector antisymmetric solitons.

关键词： fractional quadric-cubic coupled nonlinear Schrodinger equation vector symmetric solitons vector antisymmetric solitons stability

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LIFTING FORCE ACTING ON A GATE WITH HIGH HEAD

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Journal of Hydrodynamics 2011年第3期23卷 379-383页

作者： LIU Xiao-qing Zhao Lan-hao cao Hui-ying SUN Xiao-peng College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

The hydrodynamic lifting force acting on a gate with high head is one of the key factors concerning the safety and reliability of gates. The lifting force is closely related to hydrodynamic pressure, and generally, is obtained through the model test. This work presents a method of numerical simulation based on the VOF method for the flow and FEM for the structure of a gate to investigate this kind of the lifting force. The physical model experiments were conducted about the hydrodynamic pressure and the lifting force to verify the numerical results. The comparisons of those two methods show that the maximum relative error is smaller than 11.40 % and the method presented in this paper is feasible and could be used in the designs of hydropower projects.

关键词： gate pressure high head lifting force numerical simulation physical model experiment

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