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Development and application of moment method on nanoparticles evolution due to coagulation and deposition

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Journal of Hydrodynamics 2019年第5期31卷 1011-1020页

作者： guang-ping Xu Jia-song Wang School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this study,the Taylor-series expansion method of moments is developed to describe the dynamic behaviour of nanoparticles considering both the effects of coagulation and deposition in closed environments,where the two effects have always been studied separately *** with traditional methods of moments,the new method could give more accurate results for solving the general dynamics *** addition,moment equations with respect to coagulation and deposition considering the fractal dimension(Df)of particles are acquired,and the results are compared with experimental data and are more accurate than the simulation results under the assumption of spherical *** new dynamic model could be applied in more real conditions with different microstructures of *** decreasing Dt,the particle number concentration decreases more rapidly,additionally,Df has a relatively greater effect on the agglomeration of smaller particles under the same initial ***,the effect of the initial number concentration on coagulation is also *** results show that a higher initial number concentration or a smaller particle size could have a greater effect of coagulation on the evolution of particles.

关键词： Moment method nanoparticle deposition coagulation fractal dimension

Purification efficiency of ecological spur dikes for river pollutants in different geometric arrangements:Experiments and numerical modeling

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Journal of Hydrodynamics 2022年第5期34卷 934-947页

作者： Yi-tian chen Xiao-ling Wang song-min Li Ya-zhi Zheng guang-yao Dong College of Environmental Science and Engineering Tianjin UniversityTianji300350China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300072China College of Hydraulic Engineering Tianjin Agricultural CollegeTianjin300392China

The traditional ecological spur dike is improved,by using the biological fillers such as the plant materials,combined with microorganisms,to obtain a larger water purification *** of the researches on spur dikes focused on the hydrodynamic force and the migration and the diffusion of the pollutants,but not so much on the effects of the spur dike materials and the arrangement parameters on the water purification *** this paper the biological zeolite is used to make ecological spur *** laboratory flume experiment shows that compared with the natural zeolite spur dike,the purification effect of the biological zeolite spur dike is significantly improved,and the average removal rate of the NH3-N is kept at 6.8%after 24 h compared with 3.5%of the natural zeolite spur *** NH3-N removal rates of a single spur dike,the counterpart spur dikes and the staggered spur dikes decrease with the increase of the inlet flow,and the staggered spur dikes have the best purification ***,a numerical model based on the MIKE21 is verified by the experimental results and applied for the Tangjiali Section of the Xutangqiao River in Xinwu District,Wuxi City,Jiangsu *** orthogonal test shows that the length of the spur dike has the most important effect on the interception of pollutants and the purification,followed by the angle of the spur dike and the spacing of the spur dikes has the least important *** geometric arrangement parameters of the ecological spur dike group with the highest efficiency on the pollutant interception and the purification are:60°(angle),6.7 m(length)and 20 m(spacing).

关键词： Ecological spur dike spur dike group numerical simulation biological zeolite interception purification geometric arrangement parameters

Clinical features,radiological imaging,and treatment strategies of nonmetallic intraorbital foreign bodies:a retrospective analysis

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International Journal of Ophthalmology(English edition) 2023年第7期16卷 1130-1137页

作者： guang-Rui Chai Ming chen Zi-Xun song Lu Liu Department of Ophthalmology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

AIM:To provide comprehensive data on nonmetallic intraorbital foreign bodies(IOFBs)by summarizing and analyzing material types,clinical manifestations,imaging features,and treatment ***:Totally 28 nonmetallic IOFB cases treated at Shengjing Hospital of China Medical University from 2012 to 2020 were retrospectively *** types of foreign bodies,clinical features,imaging manifestations,and treatment outcomes were ***:Among all cases,67.8%(19/28)of the foreign bodies were *** top three entrances were the upper eyelid skin(7/28),lower fornix conjunctiva(6/28),and lower eyelid skin(4/28).In most cases(11/28,39.3%),foreign bodies remained in the medial *** major clinical manifestations included eyelid redness and swelling(20/28,71.4%),conjunctival congestion and edema(17/28,60.7%),and ophthalmoptosis(15/28,53.6%).Infection was the main complication,which occurred in 57.1%(16/28)of all *** tomography(CT)values differed for different foreign bodies and varied in the different periods after *** plant-and grease-derived foreign bodies and the surrounding pus cysts showed different signals on magnetic resonance imaging(MRI).The prognosis varied with different foreign body types,surgery timing,and intraoperative ***:The majority of nonmetallic IOFBs are organic and often remain in the superior,medial,and inferior areas of the *** manifestations vary owing to their different *** and MRI facilitate the identification of foreign body ***-derived foreign bodies should be completely removed,and surgical treatment is a complicated process.

关键词： orbital trauma nonmetallic intraorbital foreign body clinical manifestations computed tomography magnetic resonance imaging

Parametric study on single shot peening by dimensional analysis method incorporated with finite element method

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Acta Mechanica Sinica 2012年第3期28卷 825-837页

作者： Xian-Qian Wu Xi Wang Yan-Peng Wei Hong-Wei song chen-guang Huang Key Laboratory for Hydrodynamics and Ocean Engineering Institute of MechanicsChinese Academy of Sciences100190 BeijingChina

Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Compressive re- sidual stress and dent profile are important factors to eval- uate the effectiveness of shot peening process. In this pa- per, the influence of dimensionless parameters on maximum compressive residual stress and maximum depth of the dent were investigated. Firstly, dimensionless relations of pro- cessing parameters that affect the maximum compressive residual stress and the maximum depth of the dent were de- duced by dimensional analysis method. Secondly, the in- fluence of each dimensionless parameter on dimensionless variables was investigated by the finite element method. Fur- thermore, related empirical formulas were given for each di- mensionless parameter based on the simulation results. Fi- nally, comparison was made and good agreement was found between the simulation results and the empirical formula, which shows that a useful approach is provided in this pa- per for analyzing the influence of each individual parameter.

关键词： Keywords Shot peening - Maximum compressive residualstress Maximum depth of the dent Dimensional analysismethod ~ Finite element method

Protective effect of human umbilical cord mesenchymal stem cell-derived exosomes on rat retinal neurons in hyperglycemia through the brain-derived neurotrophic factor/TrkB pathway

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International Journal of Ophthalmology(English edition) 2021年第11期14卷 1683-1689页

作者： Xiang Gao guang-Hui He Xiao-Tian Zhang song chen College of Medicine Nankai UniversityTianjin 300071China Tianjin Eye Hospital Tianjin 300020China Clinical College of Ophthalmology Tianjin Medical UniversityTianjin 300020China Ophthalmic Center of Xinjiang Production and Construction Corps Hospital Urumqi 830002Xinjiang Uygur Autonomous RegionChina

AIM:To explore whether human umbilical cord mesenchymal stem cell(hUCMSC)-derived exosomes(hUCMSC-Exos)protect rat retinal neurons in high-glucose(HG)conditions by activating the brain-derived neurotrophic factor(BDNF)-Trk B ***:h UCMSC-Exos were collected with differential ultracentrifugation methods and observed by transmission electron ***-linked immunosorbent assays(ELISAs)was used to quantify BDNF in hUCMSC-Exos,and Western blot was used to identify surface markers of *** retinal neurons were divided into 4 ***,cell viability,cell apoptosis,and TrkB protein expression were measured in retinal ***:hUCMSCs and isolated hUCMSC-Exos were successfully *** hUCMSC-Exos showed a diameter of 30 to 150 nm and had a phospholipid bimolecular membrane structure,as observed by transmission electron *** showed the BDNF concentration of hUCMSCs-Exos was 2483.16±***-Exos effectively reduced the apoptosis of retinal neuron rate and improved neuron survival rate,meanwhile,the results of immunofluorescence verified the fluorescence intensity of TrKB in neurons *** all above effects were reduced by treated hUCMSCs-Exos with BDNF ***-Exos effectively reduced the apoptosis rate of retinal neurons by activating the BDNF-TrkB pathway in a HG ***:In the HG environment,hUCMSC-Exos could carry BDNF into rat retinal neurons,inhibiting neuronal apoptosis by activating the BDNF-TrkB pathway.

关键词： human umbilical cord mesenchymal stem cells exosomes diabetic retin opathy retinal n euro ns BDNF-TrkB pathway

Self-assembly of supra-amphiphile of azobenzene-galactopyranoside based on dynamic covalent bond and its dual responses

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Chinese Chemical Letters 2016年第12期27卷 1740-1744页

作者： Tian-Nan Wang guang Yang Li-Bin Wu Guo-song chen The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan University

In this paper, dynamic covalent bond has been employed to construct supra-amphiphile of carbohydrate for the first time. In neutral environment, the molecule was fabricated by reacting a hydrophobic building block bearing benzoic aldehyde with a hydrophilic building block bearing hydrazine to form a sugar-containing supra-amphiphile based on acylhydrazone bond, The obtained azobenzene- galactopyranoside （Azo-Gal） supra-amphiphile self-assembled to fibrillar structure in water, which showed dual responses to UV light and pH.

关键词： Supra-amphiphile Self-assembly Dynamic covalent bond Carbohydrate Dual responses

Reduction of Aromatic α-Keto Esters by Commercially Available Zinc Dust and Ammonium Formate: Formation of Aromatic α-Hydroxy Esters

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Chemical Research in Chinese Universities 2011年第5期27卷 784-786页

作者： chen Gang YAO Guo-xin song guang-wei ZHU Jin-tao Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 P. R. China

Various aromatic α-keto esters were rapidly and selectively reduced to aromatic α-hydroxy esters by commercially available zinc dust and ammonium formate in the presence of other functional groups such as halogens, ... 详细信息

关键词： Aromatic aoketo ester Zinc dust Ammonium formate Aromatic a-hydroxy ester

Mesenchymal stem cells-derived exosomes ameliorate blue light stimulation in retinal pigment epithelium cells and retinal laser injury by VEGF-dependent mechanism

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International Journal of Ophthalmology(English edition) 2018年第4期11卷 559-566页

作者： guang-Hui He Wei Zhang Ying-Xue Ma Jing Yang Li chen Jian song song chen Tianjin Eye Hospital Tianjin Key Lab of Ophthalmologyand Visual ScienceTianjin Eye InstituteClinical College of OphthalmologyTianjin Medical UniversityTianjin 300020China

AIM： To observe the effect of exosomes derived from human umbilical cord blood mesenchymal stem cells（h UCMSCs） on the expression of vascular endothelial growth factor-A（VEGF-A） in blue light injured human retinal pigment epithelial（RPE） cells and laser-induced choroidal neovascularization（CNV） in ***： Exosomes were isolated from h UCMSCs and characterized by transmission electron microscope and Western blot. MSCs-derived exosomes were cultured with RPE cells exposed to blue light. The m RNA and protein expression of VEGF-A were determined by real time-polymerase chain reaction（PCR） and Western blot, respectively. Immunofluorescence assay was used for the detection of the expression level of VEGF-A. We injected different doses of MSCs-derived exosomes intravitreally to observe and compare their effects in a mouse model of laserinduced retinal injury. The histological structure of CNV in rats was inspected by hematoxylin-eosin（HE） staining and fundus fluorescein angiography. The expression of VEGF-A was detected by ***： Exosomes exhibited the typical characteristic morphology（cup-shaped） and size（diameter between 50 and 150 nm）. The exosomes marker, CD63, and h UCMSCs marker, CD90, showed a robust presence. In vitro, MSCsderived exosomes downregulated the m RNA（Exo-L： t=6.485, 7.959, 9.286; Exo-M： t=7.517, 10.170, 13.413; Exo-H： t=10.317, 12.234, 14.592, P〈0.05） and protein（Exo-L： t=2.945, 4.477, 6.657; Exo-M： t=4.713, 6.421, 8.836; Exo-H：t=6.539, 12.194, 12.783; P〈0.05） expression of VEGF-A in RPE cells after blue light stimulation. In vivo, we found that the MSCs-derived exosomes reduced damage, distinctly downregulated VEGF-A（Exo-H： t=0.957, 1.382; P〈0.05）, and gradually improved the histological structures of CNV for a better visual function（Exo-L： 0.346, Exo-M： 3.382, Exo-H： 8.571; P〈0.05）. CONCLUSION： MSCs-derived exosomes ameliorate blue light stimulation in RPE cells and laser-induced retinal injury via downregulation of VEGF

关键词： exosome human umbilical cord mesenchymal stem cell retinal pigment epithelial cell choroidal neovascularization vascular endothelial growth factor

Dual Lie Bialgebra Structures of Twisted SchrSdinger-Virasoro Type

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Algebra Colloquium 2018年第4期25卷 627-652页

作者： guang'ai song Xiaoqing Yue College of Mathematics and Information Science Shandong Technology and Business University YantaiShandong 264005China School of Mathematical Sciences Tongji UniversityShanghai 200092China

In this paper,the structures of dual Lie bialgebras of twisted SchrSdinger-Virasoro type are *** studying the maximal good subspaces,we determine the dual Lie coalgebras of the twisted SchrSdinger-Virasoro *** based on this,we construct the dual Lie bialgebra structures of this *** by-products,four new infinite dimensional Lie algebras are obtained.

关键词： Schrodinger-Virasoro algebra Virasoro algebra Lie bialgebra dual Lie bialgebra