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Catalytic Performance of Carbon Smoke over Ag-LSCF Composite Catalysts

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期 30-34页

作者：郭冠伦 han ming LU Shaomin YU Jing 鞠洪玲 Hubei Key Laboratory of Advanced Technology for Automotive Components & Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology College of Mechanical and Transportation Southwest Forestry University

To improve the catalytic performance of La0.6Sr0.4Co0.2Fe0.8O3（LSCF） towards carbon soot,we utilized the impregnation method to incorporate Ag into the prepared LSCF *** conducted a series of characterization tests and evaluated the soot catalytic activity of the composite catalyst by comparing it with the LaCoO3group,LaFeO3group,and catalyst-free *** results indicate that the Ag-LSCF composite catalyst exhibits the highest soot catalytic activity,with the characteristic temperature values of 376.3,431.1,and 473.9 ℃ at 10 %,50 %,and 90 % carbon soot conversion,*** values are 24.8,20.2,and 23.1 ℃ lower than those of the LSCF *** also shows that LSCF can improve the catalytic activity of soot after compounding with Ag,and reflects the necessity of using catalysts in soot combustion *** characterization and BET test show that Ag-LSCF has more abundant surface-adsorbed oxygen species,larger specific surface area and pore volume than LSCF,which also proves that Ag-LSCF has higher soot catalytic activity.

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Self-Consistent Kinetic Modeling of Electron Distribution Function in a Low-Pressure Inductively Coupled Plasma

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Chinese Physics Letters 1996年第6期13卷 447-450页

作者： YANG Yun WU han-ming Institute of Mechanics Chinese Academy of SciencesBeijing 100080

Based upon the spatially inhomogeneous Boltzmann equation in two-term approximation coupled with electromagnetic and fluid model analysis for the recently developed inductively coupled plasma sources,a self-consistent electron kinetic model is *** electron distribution function,spatial distributions of the electron density and ionization rate are calculated and discussed.

关键词： Electron inhomogeneous spatially

Meiosis: no end in sight

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Asian Journal of Andrology 2021年第6期23卷 547-548页

作者： ming-han Tong State Key Laboratory of Molecular Biology Shanghai Key Laboratory of Molecular AndrologyShanghai 200031China Institute of Biochemistry and Cell Biology Center for Excellence in Molecular Cell ScienceUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200031China School of Life Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China

Meiosis is an essential event that generates haploid gametes from diploid progenitors in all sexually reproducing organisms. It involves a single round of DNA replication followed by two rounds of chromosome segregation: separating homologous chromosomes (homologs;meiosis I [MI]), then sister chromatids (meiosis II [MII]). During the first meiotic prophase (MI prophase), homologs undergo recombination, pairing, and synapsis through the formation of the synaptonemal complex (SC). Recombination, the most prominent feature in meiosis, can increase genetic diversity during inheritance and generate physical connections between homologs to ensure their accurate segregation at MI prophase. In humans, meiotic errors can result in either infertility or gametic aneuploidy/mutation (hence, miscarriage or birth defects). With technological advances in the past few decades, researchers have made rapid progress in the field of meiosis. This special issue contains seven papers: five are reviews summarizing our current knowledge on meiosis (in particular mammalian MI prophase), and one is commentary highlighting an original research article on CRISPR-Cas9-based gene therapy for the treatment of meiotic arrest azoospermia in mice.

关键词： separating hence treatment

A MIXED FINITE ELEMENT METHOD ON A STAGGERED MESH FOR NAVIER-STOKES EQUATIONS

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Journal of Computational Mathematics 2008年第6期26卷 816-824页

作者： Houde han ming Yan Department of Mathematics University of Science and Technology of China Hefei 230026 China

In this paper, we introduce a mixed finite element method on a staggered mesh for the numerical solution of the steady state Navier-Stokes equations in which the two components of the velocity and the pressure are defined on three different meshes. This method is a conforming quadrilateral Q1 × Q1 - P0 element approximation for the Navier-Stokes equations. First-order error estimates are obtained for both the velocity and the pressure. Numerical examples are presented to illustrate the effectiveness of the proposed method.

关键词： Mixed finite element method Staggered mesh Navier-Stokes equations Error estimate.

A joint absorbing boundary for the multiple-relaxation-time lattice Boltzmann method in seismic acoustic wavefield modeling

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Petroleum Science 2023年第4期20卷 2113-2126页

作者： Chun-Tao Jiang Hui Zhou Mu-ming Xia han-ming Chen Jin-Xuan Tang State Key Laboratory of Petroleum Resources and Prospecting CNPC Key Lab of Geophysical ExplorationChina University of PetroleumBeijing102249China CAS Engineering Laboratory for Deep Resources Equipment and Technology Institute of Geology and Geophysicsand Innovation Academy for Earth ScienceChinese Academy of SciencesBeijing100029China Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

Conventional seismic wave forward simulation generally uses mathematical means to solve the macroscopic wave equation,and then obtains the corresponding seismic ***,when the subsurface structure is finely constructed and the continuity of media is poor,this strategy is difficult to meet the requirements of accurate wavefield *** paper uses the multiple-relaxation-time lattice Boltzmann method(MRT-LBM)to conduct the seismic acoustic wavefield simulation and verify its computational *** cope with the problem of severe reflections at the truncated boundaries,we analogize the viscous absorbing boundary and perfectly matched layer(PML)absorbing boundary based on the single-relaxation-time lattice Boltzmann(SRT-LB)equation to the MRT-LB equation,and further,propose a joint absorbing boundary through comparative *** give the specific forms of the modified MRT-LB equation loaded with the joint absorbing boundary in the two-dimensional(2D)and three-dimensional(3D)cases,***,we verify the effects of this absorbing boundary scheme on a 2D homogeneous model,2D modified British Petroleum(BP)gas-cloud model,and 3D homogeneous model,*** results reveal that by comparing with the viscous absorbing boundary and PML absorbing boundary,the joint absorbing boundary has the best absorption performance,although it is a little bit ***,this joint absorbing boundary better solves the problem of truncated boundary reflections of MRT-LBM in simulating seismic acoustic wavefields,which is pivotal to its wide application in the field of exploration seismology.

关键词： Multiple-relaxation-time Lattice Boltzmann method Seismic acoustic wavefield simulation Truncated Boundary reflection Joint absorbing boundary

Core-scale modeling of surfactant-assisted spontaneous water imbibition in carbonates

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Petroleum 2022年第4期8卷 458-465页

作者： Xingang Bu ming han Abdulkareem M.AlSofi Beijing Research Center Aramco AsiaBeijing100102China EXPEC Advanced Research Center Saudi AramcoDhahran31311Saudi Arabia

This work numerically investigates surfactant effects on spontaneous water imbibition in oil-wet *** open boundary core-scale imbibition model with 9×9×10 gridblocks was used in UTCHEM to simulate carbonate core plug exposure to a vast water *** simulation models were developed based on surfactant-assisted imbibition tests that were conducted in secondary and tertiary oil production modes using Amott cells at 75℃.Capillary and gravity forces were captured by history matching the *** history matching,the inputs for surfactant adsorption and diffusion,capillary pressure and relative permeability were *** tertiary mode,the surfactants-assisted imbibition process presents the performance in mixed-wet state rather than oil-wet state,which is governed by wettability alteration.A simulation model for surfactant-assisted imbibition in secondary mode was used to investigate the effects of various factors including interfacial tension(IFT)reduction,wettability alteration,adsorption,volume of surrounding water and capillary *** simulation results suggest that surfactant-assisted water imbibition in secondary mode is gravity dominant,which is facilitated by both IFT reduction and wettability alteration caused by addition of proper *** from water imbibition in water-wet core,it presents vertically dominant oil flow with a hemispherical oil-rich area and uneven remaining oil *** is obvious that sufficient surfactant supply in vast water is required to make effective imbibition,in consideration of surfactant consumption and changes in concentration *** core-scale modeling provides insights of surfactant-assisted imbibition in initially oil-wet carbonates and helps scale up the application in a cost-effective way.

关键词： Surfactant Imbibition Core-scale modeling Simulation Wettability alteration Interfacial tension

Zr-Ti-Al-Fe-Cu bulk metallic glasses for biomedical device application

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Rare Metals 2021年第5期40卷 1239-1246页

作者： Kai-ming han Hui Jiang Ying-Min Wang Jian-Bing Qiang College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Materials Modification(Ministry of Education) Dalian University of TechnologyDalian 116024China

A series of Zr_(63.5-x)Ti_(x)Al_(9)Fe_(4.5)Cu_(23)(x=0,1.5,3.0,4.5,6.0;at%) bulk metallic glasses(BMGs) were designed and produced by means of copper mold suction *** effect of Ti addition on the glass-forming ability(GFA) and mechanical properties of Zr_(63.5-x)Ti_(x)Al_(9)Fe_(4.5)Cu_(23) alloys was first *** glassforming ability and room-temperature plasticity of BMGs increase first and then reduced with Ti content *** x=3.0,the Zr_(60.5)Ti_(3)Al_(9)Fe_(4.5)Cu_(23) BMG showed a critical glass formation diameter of 10 mm and excellent room-temperature compressive plasticity(εP=4.7%) by using the samples with dimensions of Φ3 mm × 6 ***,the BMG also showed better biocompatibility and biocorrosion resistance compared with Ti6 A14 V *** the imitated human body condition,the corrosion current density(Icorr) of BMG was 6.61 × 10^(-10) A·cm^(-2),which is two orders of magnitude lower than that of conventional Ti6Al4V ***,the CCD-986 sk cell viabilities are,respectively,65.4% and 46.6% on the BMG and Ti6 A14 V alloy,indicating better biocompatibility of *** Zr_(60.5)Ti_(3)Al_(9)Fe_(4.5)Cu_(23) BMG with larger GFA,excellent mechanical properties,biocompatibility and biocorrosion resistance is considered as a potential material in biomedical device fields.

关键词： Bulk metallic glasses Biomedical material Mechanical property Biocompatibility

Deposition of Layer-by-layer Inorganic-organic Nano-hybrid Ultrathin Films onto SBA-15

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Chinese Chemical Letters 2003年第8期14卷 852-855页

作者： han ming DING Li Ping WANG Yong Kui Shan ming Yuan HE Center for the Chemistry of Ionic Liquids East China Normal UniversityShanghai 200062

Deposition of inorganic-organic nano-hybrid ultrathin films onto mesoporous silicate materials has been proven possible by using layer-by-layer assembly method. In combination with sol-gel method, titania, subsequently dye molecules (or polymer) were successfully fabricated onto the inner wall of SBA-15. Their structures were preliminarily characterized by FTIR and solid-state UV-Vis spectroscopy, thermal analysis, and BET surface area measurements, respectively.

关键词： Mesoporous silicate titania dye polymer layer-by-layer.

Wave propagation across fluid-solid interfaces with LBM-LSM coupling schemes

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Petroleum Science 2024年第5期21卷 3125-3141页

作者： Mu-ming Xia Hui Zhou Chun-Tao Jiang han-ming Chen Jin-ming Cui Can-Yun Wang Chang-Chun Yang CAS Engineering Laboratory for Deep Resources Equipment and Technology Institute of Geology and Geophysicsand Innovation Academy for Earth ScienceChinese Academy of SciencesChaoyangBeijing100029China State Key Laboratory of Petroleum Resources and Engineering CNPC Key Lab of Geophysical ExplorationChina University of Petroleum(Beijing)ChangpingBeijing102249China Qingdao Institute of Marine Geology China Geological SurveyQingdao266237ShandongChina AI Sonic Technology Research Center Research Institute of Tsinghua University in ShenzhenShenzhen518057GuangdongChina

Seismic wave propagation in fluid-solid coupled media is currently a popular topic. However, traditional wave equation-based simulation methods have to consider complex boundary conditions at the fluid-solid interface. To address this challenge, we propose a novel numerical scheme that integrates the lattice Boltzmann method(LBM) and lattice spring model(LSM). In this scheme, LBM simulates viscoacoustic wave propagation in the fluid area and LSM simulates elastic wave propagation in the solid area. We also introduce three different LBM-LSM coupling strategies, a standard bounce back scheme, a specular reflection scheme, and a hybrid scheme, to describe wave propagation across fluid-solid boundaries. To demonstrate the accuracy of these LBM-LSM coupling schemes, we simulate wave propagation in a two-layer model containing a fluid-solid interface. We place excitation sources in the fluid layer and the solid layer respectively, to observe the wave phenomena when seismic waves propagate to interface from different sides. The simulated results by LBM-LSM are compared with the reference wavefields obtained by the finite difference method(FDM) and the analytical solution(ANA).Our LBM-LSM coupling scheme was verified effective, as the relative errors between the LBM-LSM solutions and reference solutions were within an acceptable range, sometimes around 1.00%. The coupled LBM-LSM scheme is further used to model seismic wavefields across a more realistic rugged seabed,which reveals the potential applications of the coupled LBM-LSM scheme in marine seismic imaging techniques, such as reverse-time migration and full-waveform inversion. The method also has potential applications in simulating wave propagation in complex two-and multi-phase media.

关键词： Lattice Boltzmann method(LBM) Lattice spring model(LSM) LBM-LSM coupling Finite difference method(FDM) Fluid-solid configuration Seismic wave simulation