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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

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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

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加拿大白桦地致密气储层定量表征技术

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石油学报 2017年第4期38卷 363-374页

作者：穆龙新张铭夏朝辉曲良超蒋平中国石油勘探开发研究院北京100083

以加拿大白桦地大型致密砂岩气田的研究为基础,梳理了致密气开发过程中需要评价分析的5大品质特性,提出了表征致密气储层特征的关键参数,确定了适用研究区的致密气储层定量表征和评价技术,形成了一套指标体系:多旋回精细等时地层格架和... 详细信息

以加拿大白桦地大型致密砂岩气田的研究为基础,梳理了致密气开发过程中需要评价分析的5大品质特性,提出了表征致密气储层特征的关键参数,确定了适用研究区的致密气储层定量表征和评价技术,形成了一套指标体系:多旋回精细等时地层格架和砂体叠置结构特征分析技术以确定储层空间展布;TOC测井参数地质统计定量技术以确定有机质丰度;岩心"四性"关系标定与序贯高斯模拟的储层物性定量表征技术以确定储层物性分类级别;基于岩心应力实验和测井解释的岩石脆性指数综合判定技术以确定岩石可压性;与压裂水平井产量相关的多参数组合综合评价技术以确定有利布井区;井下微地震监测技术定量用以表征人工裂缝、优化井位部署;水平井分段压裂优化技术确定最佳压裂段数、缝间距等参数,落实分段压裂水平井单井控制体积,确定单井控制储量。通过储层和裂缝综合研究不断优化致密气藏开发井网,其中大规模水平井压裂是致密气高产的有效保障,这些技术的现场应用也取得了显著的效果。

关键词：致密气田储层品质关键参数定量表征水平井多级压裂加拿大白桦地

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Chondroitinase ABC combined with Schwann cell transplantation enhances restoration of neural connection and functional recovery following acute and chronic spinal cord injury

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Neural Regeneration Research 2025年第5期20卷 1467-1482页

作者： Wenrui Qu xiangbing Wu Wei Wu Ying Wang Yan Sun Lingxiao Deng Melissa Walker Chen Chen Heqiao Dai Qi Han Ying Ding Yongzhi xia George Smith Rui Li Nai-Kui Liu xiao-ming Xu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA Department of Hand Surgery the Second Hospital of Jilin UniversityChangchunJilin ProvinceChina Shriners Hospitals Pediatric Research Center Temple University School of MedicinePhiladelphiaPAUSA Department of Anatomy&Cell Biology Indiana University School of MedicineIndianapolisINUSA

Schwann cell transplantation is considered one of the most promising cell-based therapy to repair injured spinal cord due to its unique growth-promoting and myelin-forming properties.A the Food and Drug Administration-approved Phase I clinical trial has been conducted to evaluate the safety of transplanted human autologous Schwann cells to treat patients with spinal cord injury.A major challenge for Schwann cell transplantation is that grafted Schwann cells are confined within the lesion cavity,and they do not migrate into the host environment due to the inhibitory barrier formed by injury-induced glial scar,thus limiting axonal reentry into the host spinal *** we introduce a combinatorial strategy by suppressing the inhibitory extracellular environment with injection of lentivirus-mediated transfection of chondroitinase ABC gene at the rostral and caudal borders of the lesion site and simultaneously leveraging the repair capacity of transplanted Schwann cells in adult rats following a mid-thoracic contusive spinal cord *** report that when the glial scar was degraded by chondroitinase ABC at the rostral and caudal lesion borders,Schwann cells migrated for considerable distances in both rostral and caudal *** Schwann cell migration led to enhanced axonal regrowth,including the serotonergic and dopaminergic axons originating from supraspinal regions,and promoted recovery of locomotor and urinary bladder ***,the Schwann cell survival and axonal regrowth persisted up to 6 months after the injury,even when treatment was delayed for 3 months to mimic chronic spinal cord *** findings collectively show promising evidence for a combinatorial strategy with chondroitinase ABC and Schwann cells in promoting remodeling and recovery of function following spinal cord injury.

关键词： axonal regrowth bladder function chondroitinase ABC functional recovery glial scar lentivirus migration Schwann cell spinal cord injury transplantation

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Palladium installed copper-organic framework for C–C coupling reactions

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Science China Chemistry 2025年

作者： Yu-Mei Wang Mei-xia Tao Kai-ming Mo Xu Chen Shu-Hua Zhong Elena S Shubina Guo-Hong Ning Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Supramolecular Coordination ChemistryJinan University A.N.Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences

The formation of C–C bonds is a crucial aspect of organic synthesis. Synthesists' long-term objective is to identify novel catalysts to optimize reaction systems based on traditional transition metal catalysis. This study explores the synthesis and catalytic potential of palladium-installed covalent metal-organic frameworks(CMOFs) based on copper cyclic trinuclear units(Cu-CTUs). By incorporating palladium ions into the imine-based framework JNM-7 through a straightforward immersion method, we achieved a notable enhancement in catalytic activity for critical C–C coupling reactions, including C–H arylation and Sonogashira cross-coupling. The resulting JNM-7-Pd demonstrated remarkable stability and recyclability, maintaining its efficiency over at least three cycles without any decline in efficiency.

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Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number

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Journal of Thermal Science 2025年第1期 34-49页

作者： WANG Shuang mu Lin LI Xue XIE Jun DONG ming School of Energy and Power Engineering Dalian University of Technology School of Optical Information and Energy Engineering Wuhan Institute of Technology School of Energy and Environment Shenyang Aerospace University

Turbulent agglomeration is viewed as a promising technology for enhancing fine particle removal *** better understand particle transport,agglomeration behaviors,and fluid-particle interactions,we numerically explored these phenomena under cylindrical vortex wake influence using a coupled large eddy simulation and discrete element method（LES-DEM） *** validity of the LES approach was verified by comparison with available direct numerical simulation（DNS） *** adopted the Johnson-Kendall-Roberts（JKR） contact model for particle-particle *** particle dispersion and agglomeration characteristics of particles with different diameters（dp=2-20 μm） in the laminar and transition of shear layer（TrSL） flow regimes were *** particles were concentrated at the vortex centers,while larger particles accumulated around the *** agglomeration efficiency exhibited an M-shaped profile spanwise（y-direction）.With increasing Reynolds number,the agglomeration efficiency and turbulence intensity *** particle agglomeration efficiency peaks at a certain Reynolds ***,at higher Reynolds numbers,reducing the residence time of particles in the flow field decreases the agglomeration efficiency.

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Identifying the sensitive areas in targeted observation for predicting the Kuroshio large meander path in a regional ocean model

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Acta Oceanologica Sinica 2022年第2期41卷 3-14页

作者： xia Liu Qiang Wang mu mu School of Mathematics Zhengzhou University of AeronauticsZhengzhou 450046China Key Laboratory of Marine Hazards Forecasting of Ministry of Natural Resources Hohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China

With the Regional Ocean Modeling System(ROMS),this paper investigates the sensitive areas in targeted observation for predicting the Kuroshio large meander(LM)path using the conditional nonlinear optimal perturbation *** identify the sensitive areas,the optimal initial errors(OIEs)featuring the largest nonlinear evolution in the LM prediction are first calculated;the resulting OIEs are localized mainly in the upper 2500 m over the LM upstream region,and their spatial structure has certain similarities with that of the optimal triggering *** on this spatial structure,the sensitive areas are successfully identified,located southeast of Kyushu in the region(29°–32°N,131°–134°E).A series of sensitivity experiments indicate that both the positions and the spatial structure of initial errors have important effects on the LM prediction,verifying the validity of the sensitive ***,the effect of targeted observation in the sensitive areas is evaluated through observing system simulation *** targeted observation is implemented in the identified sensitive areas,the prediction errors are effectively reduced,and the prediction skill of the LM event is improved *** provides scientific guidance for ocean observations related to enhancing the prediction skill of the LM event.

关键词： Kuroshio large meander targeted observation sensitive areas ROMS

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Optimal Initial Error Growth in the Prediction of the Kuroshio Large Meander Based on a High-resolution Regional Ocean Model

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Advances in Atmospheric Sciences 2018年第11期35卷 1362-1371页

作者： xia LIU Qiang WANG mu mu CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Institute of Atmospheric Sciences Fudan UniversityShanghai 200433China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Based on the high-resolution Regional Ocean Modeling System(ROMS) and the conditional nonlinear optimal perturbation(CNOP) method, this study explored the effects of optimal initial errors on the prediction of the Kuroshio large meander(LM) path, and the growth mechanism of optimal initial errors was revealed. For each LM event, two types of initial error(denoted as CNOP1 and CNOP2) were obtained. Their large amplitudes were found located mainly in the upper 2500 m in the upstream region of the LM, i.e., southeast of Kyushu. Furthermore, we analyzed the patterns and nonlinear evolution of the two types of CNOP. We found CNOP1 tends to strengthen the LM path through southwestward extension. Conversely,CNOP2 has almost the opposite pattern to CNOP1, and it tends to weaken the LM path through northeastward *** growth mechanism of optimal initial errors was clarified through eddy-energetics analysis. The results indicated that energy from the background field is transferred to the error field because of barotropic and baroclinic instabilities. Thus, it is inferred that both barotropic and baroclinic processes play important roles in the growth of CNOP-type optimal initial errors.

关键词： Kuroshio large meander predictability ROMS optimal initial error growth

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Editorial of non-human primate research

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National Science Review 2023年第11期10卷 6-7页

作者： mu-ming Poo CAS Center for Excellence for Brain Science and Intelligence Technology

The progress of biology and medicine over the past century has been greatly facilitated by research based on animal models that could be used for experimentation. Small animal models such as the nematode worm C. elegans and the fruit fly Drosophila played crucial roles in the development of genetics, embryology, and cell biology. The mouse has become the quintessential animal model in the past few decades, largely due to development of mouse lines that have acquired genetic homogeneity via inbreeding over many generations, and many transgenic mouse lines carrying modified genetic makeup are also available. Mouse lines mimicking a variety of human diseases caused by genetic mutations are widely used for studying pathogenic mechanisms and for testing the efficacy of therapeutic treatments prior to human clinical trials.

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Syntheses, Structures, and Blue Luminescent Properties of 2,6-Bis-(benzimidazolyl) Pyridine and Its Mercury Complex

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Chemical Research in Chinese Universities 2007年第2期23卷 159-162页

作者： LIU xiao-ming mu xiao-yue xia Hong SU Qing YE Ling CHEN Chao GAO Wei mu Ying Key Laboratory for Supramolecular Structure and Materials of Ministry of Education College of Chemistry Jilin University Changchun 130012 P. R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

A novel blue luminescent mercury （ Ⅱ ） complex of 2,6-bis （benzimidazolyl） pyridine （L） was synthesized. In solid state, this complex has the formula [Hg（L）Cl2] · 2DMF（1）. The molecular structures of both the ligand and the complex were determined by using tingle-crystal X-ray diffraction. Crystallographic studies of the mercury （ Ⅱ） complex reveal that the complex possesses a five-coordinated geometry that can be best described as a distorted trigonal-bipyramidal. The luminescent properties of ligand L and complex 1 both in solution and in solid state were also studied.

关键词： 2,6-Bis (benzimidazolyl) pyridine Mercury Crystal structure Blue luminescence

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