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A Strong Stability-Preserving Predictor-Corrector Method for the Simulation of Elastic Wave Propagation in Anisotropic Media

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Communications in Computational Physics 2012年第9期12卷 1006-1032页

作者： d.h.yang N.Wang E.Liu department of Mathematical Sciences Tsinghua UniversityBeijing 100084P.R.China department of Geophysics China University of Mining and TechnologyXuzhouJiangsu ProvinceP.R.China

In this paper,we propose a strong stability-preserving predictor-corrector(SSPC)method based on an implicit Runge-Kutta method to solve the acoustic-and elastic-wave *** first transform the wave equations into a system of ordinary differential equations(OdEs)and apply the local extrapolation method to discretize the spatial high-order derivatives,resulting in a system of semi-discrete *** we use the SSPC method based on an implicit Runge-Kutta method to solve the semi-discrete OdEs and introduce a weighting parameter into the SSPC *** top of such a structure,we develop a robust numerical algorithm to effectively suppress the numerical dispersion,which is usually caused by the discretization of wave equations when coarse grids are used or geological models have large velocity contrasts between adjacent ***,we investigate the performance of the SSPC method including numerical errors and convergence rate,numerical dispersion,and stability criteria with different choices of the weighting parameter to solve 1-d and 2-d acoustic-and elastic-wave *** the SSPC is applied to seismic simulations,the computational efficiency is also investigated by comparing the SSPC,the fourth-order Lax-Wendroff correction(LWC)method,and the staggered-grid(SG)finite *** of synthetic waveforms computed by the SSPC and analytic solutions for acoustic and elastic models are given to illustrate the accuracy and the validity of the ***,several numerical experiments are conducted for the geological models including a 2-d homogeneous transversely isotropic(TI)medium,a two-layer elastic model,and the 2-d SEG/EAGE salt *** results show that the SSPC can be used as a practical tool for large-scale seismic simulation because of its effectiveness in suppressing numerical dispersion even in the situations such as coarse grids,strong interfaces,or high frequencies.

关键词： SSPC method seismic wavefield modeling anisotropy numerical dispersion shearwave splitting

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术前心脏CT对成人先天性心脏间隔缺损的诊断价值

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国际医学放射学杂志 2015年第4期 400-401页

作者： h.J.Eom d.h.yang JW.Kang d.h.Kim J.-M.Song d.h.Kang 俞翔 department of Radiology and Research Institute of Ra diology Cardiac Imaging Center Asan Medical Center University of Ul san College of Medicine Asanbyeongwon-gil 86Seoul 138-736 South Korea

摘要目的评估术前心脏CT对成人先天性心脏间隔缺损(CSd)的诊断价值。方法本研究共纳入行术前心脏CT检查和手术治疗的CSd病人65例。以手术结果作为参照标

关键词：术前心脏诊断价值 CT 成人

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主动脉瓣置换术后假体下血管翳:心脏CT表现及临床特点

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国际医学放射学杂志 2015年第6期 576-577页

作者： K.han d.h.yang S.Y.Shin N.Kim J.W.Kang d.h.Kim 刘丽华 department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of Medicine

摘要目的研究主动脉瓣置换病人术后假体下血管翳形成的心脏CT表现及临床意义。方法本研究获得机构伦理委员会批准,所有病人签署知情同意书。回顾性分析2011年

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四维MRI对狭窄后湍流模型的评价:流量计和计算流体动力学的比较

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国际医学放射学杂志 2016年第6期 710-711页

作者： J.Kweon d.h.yang G.B.Kim N.Kim M.Y.Paek A.F.Stalder 刘俊朋 department of Cardiology and heart Institute Asan Medical CenterUniversity of Ulsan College of Medicine

摘要目的用流量计和计算流体动力学(CFd)作为参考,验证流动模型的四维MRI。方法用狭窄程度75%和90%的流动模型对四维MRI进行验证。在冠状面和横轴面上研

关键词：四维流动模型 MRI 计算流体动力学流量计流量仪表海洋仪器

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From Imperfection to Perfection: Advanced 3d Facial Reconstruction Using MICA Models and Self-Supervision Learning

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Computer Modeling in Engineering & Sciences 2025年第2期142卷 1459-1479页

作者： Thinh d.Le duong Q.Nguyen Phuong d.Nguyen h.Nguyen-Xuan CIRTECh Institute HUTECH UniversityHo Chi Minh City72308Viet Nam

Research on reconstructing imperfect faces is a challenging *** this study,we explore a data-driven approach using a pre-trained MICA(MetrIC fAce)model combined with 3d printing to address this *** propose a training strategy that utilizes the pre-trained MICA model and self-supervised learning techniques to improve accuracy and reduce the time needed for 3d facial structure *** results demonstrate high accuracy,evaluated by the geometric loss function and various statistical *** showcase the effectiveness of the approach,we used 3d printing to create a model that covers facial *** findings indicate that our method produces a model that fits well and achieves comprehensive 3d facial *** technique has the potential to aid doctors in treating patients with facial injuries.

关键词： 3d face reconstruction self-supervised learning face defect 3d printed prototypes

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Finite-difference modelling in two-dimensional anisotropic media using a flux-corrected transport technique

Finite-difference modelling in two-dimensional anisotropic m...

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中国科学院地质与地球物理研究所2002学术年会

作者： d.h.yang~a,E.Liu~b,Z.J.Zhang~c and J.W.Teng~c a.department of Mathematics.Tsinghua University Beijing 100084,China b.British Geological Survey.Murchison house.West Mains Road.Edinburgh Eh9 3LA,UK. c.nstitute of Geology & Geophysics.Chinese Academy of Sciences.Beijing 100101,China

The conventional finite-difference(Fd) method often suffers from numerical dispersion when too few samples per wavelength are used or when models have large velocity contrast,or artefacts caused by source at grid *** this paper,we present a fast finite-difference scheme that is based on the application of vectors and matrices in 2-d anisotropic media,and obtain the stability *** method is based on a flux- corrected transport(FCT) technique, originating from hydrodynamics,which can be incorporated in the conventional finite-difference method to eliminate the numerical dispersion and source-generated *** n-times decoupled absorbing boundary condition is used in our ***-component seismograms in a transversely isotropic medium with a vertical symmetry axis(TIV) are generated for two models using the FCT finite-difference *** with the results of the reflectivity method and the conventional Fd method without the FCT technique and any absorbing boundary treatments,we conclude that our FCT based Fd method can is very accurate and efficient in computing synthetic seismograms in general heterogeneous and anisotropic media.

关键词： anisotropic wave propagation finite-difference method hux-corrected transport technique synthetic seismograms

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Two texture zeros for dirac neutrinos in a diagonal charged lepton basis

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Chinese Physics C 2025年第1期49卷 127-138页

作者： Yessica Lenis John d.Gómez William A.Ponce Richard h.Benavides Instituto de Física Universidad de AntioquiaA.A.1226MedellínColombia Instituto Tecnológico Metropolitano Facultad de Ciencias Exactas y AplicadasCalle 73 N°76-354 via el voladorMedellínColombia

A systematic study of the neutrino mass matrix M_(v) with two texture zeros in a basis that the charged leptons are diagonal,and under the assumption that neutrinos are dirac particles is *** study is conducted without any approximation,first analytically and then *** neutrino oscillation data is used in our *** implications of M_(v) on lepton CP violation and neutrino mass spectrum are explored.

关键词： neutrinos texture zeros dirac particles

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A PhYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature

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horticultural Plant Journal 2025年第1期11卷 227-238页

作者： Xianmin Meng Feng Zhang Wencai yang Qingmao Shang State Key Laboratory of Vegetable Biobreeding Key Laboratory of Horticultural Crop Biology and Germplasm Innovation(Ministry of Agriculture)Institute of Vegetables and FlowersChinese Academy of Agriculture SciencesBeijing 100081China Beijing Key Laboratory of Growth and developmental Regulation for Protected Vegetable Crops Department of Vegetable ScienceCollege of HorticultureChina Agricultural UniversityBeijing 100193China

Grafting is an effective technique for increasing the resistance of vegetables to biotic and abiotic *** has been widely applied to produce solanaceous and melon *** is an important external factor affecting graft ***,the molecular mechanism by which external ambient temperature affects tomato graft formation remains *** this study,we demonstrated that elevating ambient temperature during grafting to 35℃ for more than 24 h after grafting accelerated vascular *** generated self-or heterografted combinations between phyB1B2 and pif4 loss-of-function mutant and wild-type plants,and were mutants unresponsive to graft formation at elevated ambient *** addition,elevated ambient temperature induced SlPIF4 expression during ***4 directly binds the promoters of auxin biosynthesis genes SlYUCCAs and activates their *** investigation revealed auxin accumulation in the graft junction under elevated ambient *** results illuminate the mechanism by which the PhYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature.

关键词： Graft formation Tomato Temperature Vascular Auxin

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Enhancing the photocatalytic efficiency by the molecular modification effect derived from pollutant adsorption on highly crystalline BiOBr

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Journal of Environmental Sciences 2025年第2期148卷 263-273页

作者： yang Jin Tongyin Liu Yanpeng Mao Fan Li Chun hu National Engineering Laboratory for Reducing Emissions from Coal Combustion Engineering Research Center of Environmental Thermal Technology of Ministry of EducationShandong Key Laboratory of Energy Carbon Reduction and Resource UtilizationSchool of Energy and Power EngineeringShandong UniversityJinan 250061China Beijing Enterprises Water Grouphina>Investment Limited Beijing 100102China Institute of Environmental Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China Key Laboratory of drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The adsorption of pollutants can not only promote the direct surface reaction,but also modify the catalyst itself to improve its photoelectric characteristics,which is rarely studied for water treatment with inorganic photocatalyst.A highly crystalline BiOBr(c-BiOBr)was synthesized by a two-step preparation *** to the calcination,the highly crystalline enhanced the interface interaction between pollutant and *** complex of organic pollutant and[Bi_(2)O_(2)]^(2+)could promote the active electron transfer from the adsorbed pollutant to c-BiOBr for the direct pollutant degradation by holes(h^(+)).Moreover,the pollutant adsorption actually modified c-BiOBr and promoted more unpaired electrons,which would coupling with the photoexcitation to promote generate more O_(2)^(•-).The molecular modification effect derived from pollutant adsorption significantly improved the removal of *** work strongly deepens the understanding of the molecularmodification effect from the pollutant adsorption and develops a novel and efficient approach for water treatment.

关键词： highly crystalline BiOBr Pollutant adsorption Molecular modification Photocatalysis Water treatment

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Extraordinary synergy on 3d hierarchical porous Co-Cu nanocomposite for catalytic elimination of VOCs at low temperature and high space velocity

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Journal of Environmental Sciences 2025年第5期151卷 714-732页

作者： Jinyan Xiao Chi Zhang Lei yang Shengwei Tang Wenxiang Tang School of Chemical Engineering Sichuan UniversityChengdu 610065China

It is still a challenge to develop hierarchically nanostructured catalysts with simple approaches to enhance the low-temperature catalytic ***,a set of mesoporous Co-Cu binary metal oxides with different morphologies were successfully prepared via a facile ammonium bicarbonate precipitation method without any templates or surfactants,which were further applied for catalytic removal of carcinogenic *** the catalysts with different ratios,the CoCu_(0.2)composite oxide presented the best performance,where the temperature required for 90%conversion of toluene was only 237°C at the high weight hour space velocity(WhSV)of 240,000 mL/(gcat·hr).Meanwhile,compared to the related Co-Cu composite oxides prepared by using different precipitants(NaOh and h_(2)C_(2)O_(4)),the Nh_(4)hCO_(3)-derived CoCu_(0.2)sample exhibited better catalytic efficiency in toluene oxidation,while the T90 were 22 and 28°C lower than those samples prepared by NaOh andh_(2)C_(2)O_(4)routes,*** on various characterizations,it could be deduced that the excellent performance was related to the small crystal size(6.7 nm),large specific surface area(77.0 m2/g),hollow hierarchical nanostructure with abundant high valence Co ions and adsorbed oxygen *** situ dRIFTS further revealed that the possible reaction pathway for the toluene oxidation over CoCu_(0.2)catalyst followed the route of absorbed toluene→benzyl alcohol→benzaldehyde→benzoic acid→carbonate→CO_(2)and h_(2)*** addition,CoCu_(0.2)sample could keep stable with long-time operation and occur little inactivation under humid condition(5 vol.%water),which revealed that the Nh_(4)hCO_(3)-derived CoCu_(0.2)nanocatalyst possessed great potential in industrial applications for VOCs abatement.

关键词： Toluene oxidation Co-Cu composite Synergistic effect hollow hierarchical nanostructure Precipitation method

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